Added Retry Policy and Launcher Error.

Included ErrorHelper for mapping.

.idea/.idea.AlayaCore/.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

AlayaCore.sln.DotSettings.user

@@ -1,3 +1,26 @@
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AlayaCore/Abstractions/Configuration/BaseConfig.cs

@@ -0,0 +1,7 @@
+namespace AlayaCore.Abstractions.Configuration
+{
+    public abstract class BaseConfig
+    {
+        public abstract string FileName { get; }
+    }
+}

AlayaCore/Abstractions/Interfaces/IFileStore.cs

@@ -0,0 +1,12 @@
+using AlayaCore.Utilities.Enums;
+
+namespace AlayaCore.Abstractions.Interfaces
+{
+    public interface IFileStore
+    {
+        string Get(FolderLocation location);
+        string GetOrCreate(FolderLocation location);
+        string Combine(FolderLocation location, params string[] paths);
+        bool Exists(FolderLocation location);
+    }
+}

AlayaCore/Abstractions/Interfaces/ILaunchDirector.cs

@@ -1,21 +1,27 @@
+using System;
 using System.Threading;
 using System.Threading.Tasks;
-using AlayaCore.Models;
+using AlayaCore.Models.Progress;
+using AlayaCore.Models.Results;
 using AlayaCore.States;
 
 namespace AlayaCore.Abstractions.Interfaces
 {
     public interface ILaunchDirector
     {
-        Task<LaunchPlan> EvaluateAsync(CancellationToken cancellationToken = default);
-
-        Task InstallOrUpdateAsync(CancellationToken cancellationToken = default);
-
-        Task LaunchAsync(CancellationToken cancellationToken = default);
-
         bool CanRun { get; }
         bool NeedsUpdating { get; }
         
+        bool IsUpdatingLauncher { get; }
+        
         LaunchPlan? CurrentPlan { get; }
+
+        Task<LaunchPlan> EvaluateAsync(CancellationToken cancellationToken = default);
+
+        Task<InstallOrUpdateResult> InstallOrUpdateAsync(
+            CancellationToken cancellationToken = default,
+            IProgress<LauncherProgress>? progress = null);
+
+        Task LaunchAsync(CancellationToken cancellationToken = default);
     }
 }

AlayaCore/Abstractions/Interfaces/Policies/IRetryPolicy.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace AlayaCore.Abstractions.Interfaces.Policies
+{
+    public interface IRetryPolicy
+    {
+        Task ExecuteAsync(
+            Func<CancellationToken, Task> operation,
+            string operationName,
+            CancellationToken cancellationToken = default);
+
+        Task<T> ExecuteAsync<T>(
+            Func<CancellationToken, Task<T>> operation,
+            string operationName,
+            CancellationToken cancellationToken = default);
+    }
+}

AlayaCore/Abstractions/Interfaces/Services/IAuthService.cs

@@ -0,0 +1,14 @@
+using System.Threading;
+using System.Threading.Tasks;
+using CmlLib.Core.Auth;
+
+namespace AlayaCore.Abstractions.Interfaces.Services
+{
+    public interface IAuthService
+    {
+        Task<bool> IsAuthenticatedAsync(CancellationToken cancellationToken = default);
+        Task AuthenticateAsync(CancellationToken cancellationToken = default);
+        Task SignOutAsync(CancellationToken cancellationToken = default);
+        Task<MSession> GetSessionAsync(CancellationToken cancellationToken = default);
+    }
+}

AlayaCore/Abstractions/Interfaces/Services/IGameInstallService.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using AlayaCore.Installation;
+using AlayaCore.Models.Manifests;
+using CmlLib.Core;
+using CmlLib.Core.Installers;
+
+namespace AlayaCore.Abstractions.Interfaces.Services
+{
+    public interface IGameInstallService
+    {
+        
+        Task EnsureMinecraftInstalledAsync(
+            ManifestModel manifest,
+            InstallEnvironment environment,
+            CancellationToken cancellationToken = default,
+            EventHandler<InstallerProgressChangedEventArgs>? minecraftProgess = null,
+            EventHandler<ByteProgress>? byteProgress = null);
+
+        Task EnsureNeoForgeInstalledAsync(
+            ManifestModel manifest,
+            InstallEnvironment environment,
+            CancellationToken cancellationToken = default,
+            IProgress<InstallerProgressChangedEventArgs>? progress = null,
+            IProgress<ByteProgress>? byteProgress = null);
+
+        Task VerifyFilesAsync(
+            ManifestModel manifest,
+            CancellationToken cancellationToken = default);
+    }
+}

AlayaCore/Abstractions/Interfaces/Services/IJavaService.cs

@@ -1,15 +0,0 @@
-using System.Threading;
-using System.Threading.Tasks;
-using AlayaCore.Installation;
-using AlayaCore.Models.Manifests;
-
-namespace AlayaCore.Abstractions.Interfaces.Services
-{
-    public interface IJavaService
-    {
-        Task EnsureValidJavaInstalledAsync(
-            ManifestModel manifest,
-            InstallEnvironment environment,
-            CancellationToken cancellationToken = default);
-    }
-}

AlayaCore/Abstractions/Interfaces/Services/IManifestService.cs

@@ -7,8 +7,8 @@ namespace AlayaCore.Abstractions.Interfaces.Services
 {
     public interface IManifestService
     {
-        Task<ManifestModel> GetCoreManifestAsync(CancellationToken cancellationToken = default);
+        Task<ManifestModel> GetAlayaManifestAsync(CancellationToken cancellationToken = default);
-        Task<ManifestModel?> GetLocalCoreManifestAsync(CancellationToken cancellationToken = default);
+        Task<ManifestModel?> GetLocalAlayaManifestAsync(CancellationToken cancellationToken = default);
         
         Task<InstalledModsManifestModel> GetInstalledModsManifestAsync(CancellationToken cancellationToken = default);
 
@@ -16,7 +16,7 @@ namespace AlayaCore.Abstractions.Interfaces.Services
 
         Task<LauncherManifestModel?> GetLocalLauncherManifestAsync(CancellationToken cancellationToken = default);
 
-        Task<string> GetRemoteLauncherManifestHashAsync(CancellationToken cancellationToken = default);
+        Task<LauncherManifestModel> GetRemoteLauncherManifestAsync(CancellationToken cancellationToken = default);
         Task<Version> GetRemoteCoreManifestVersionAsync(CancellationToken cancellationToken = default);
     }
 }

AlayaCore/Abstractions/Interfaces/Services/IModService.cs

@@ -1,12 +1,18 @@
+using System;
 using System.Threading;
 using System.Threading.Tasks;
 using AlayaCore.Installation;
 using AlayaCore.Models.Manifests;
+using AlayaCore.Models.Progress;
 
 namespace AlayaCore.Abstractions.Interfaces.Services
 {
     public interface IModService
     {
-        Task ProcessModsAsync(ManifestModel manifest, InstallEnvironment environment, CancellationToken cancellationToken = default);
+        Task ProcessModsAsync(
+            ManifestModel manifest,
+            InstallEnvironment environment,
+            IProgress<DownloadProgress>? progress = null,
+            CancellationToken cancellationToken = default);
     }
 }

AlayaCore/Abstractions/Interfaces/Services/ISettingsService.cs

@@ -7,11 +7,23 @@ namespace AlayaCore.Abstractions.Interfaces.Services
     public interface ISettingsService
     {
         LauncherOptions LauncherOptions { get; }
+        GameOptions GameOptions { get; }
 
         Task SetForceReinstallAsync(bool value, CancellationToken cancellationToken = default);
 
-        Task SaveLauncherOptionsAsync(CancellationToken cancellationToken = default);
+        Task UpdateLaunchVersionAsync(string newVersion, CancellationToken cancellationToken = default);
+        Task SetMinimumRamMbAsync(int minimumRamMb, CancellationToken cancellationToken = default);
+        Task SetMaximumRamMbAsync(int maximumRamMb, CancellationToken cancellationToken = default);
+        Task SetResolutionAsync(int screenWidth, int screenHeight, CancellationToken cancellationToken = default);
+        Task SetFullscreenAsync(bool fullscreen, CancellationToken cancellationToken = default);
 
+        Task SaveLauncherOptionsAsync(CancellationToken cancellationToken = default);
         Task LoadLauncherOptionsAsync(CancellationToken cancellationToken = default);
+
+        Task SaveGameOptionsAsync(CancellationToken cancellationToken = default);
+        Task LoadGameOptionsAsync(CancellationToken cancellationToken = default);
+
+        Task LoadAllAsync(CancellationToken cancellationToken = default);
+        Task SaveAllAsync(CancellationToken cancellationToken = default);
     }
 }

AlayaCore/AlayaCore.csproj

@@ -7,7 +7,11 @@
     </PropertyGroup>
 
     <ItemGroup>
+      <PackageReference Include="CmlLib.Core" Version="4.0.6" />
+      <PackageReference Include="CmlLib.Core.Auth.Microsoft" Version="3.3.1" />
+      <PackageReference Include="CmlLib.Core.Installer.NeoForge" Version="4.0.0" />
       <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
+      <PackageReference Include="XboxAuthNet.Game.Msal" Version="0.1.3" />
     </ItemGroup>
 
 </Project>

AlayaCore/Clients/DefaultHttpClient.cs

@@ -0,0 +1,58 @@
+using System;
+using System.Net.Http;
+using System.Threading;
+using System.Threading.Tasks;
+using AlayaCore.Abstractions.Interfaces.Clients;
+
+namespace AlayaCore.Clients
+{
+    public sealed class DefaultHttpClient : IHttpClient
+    {
+        private readonly HttpClient _httpClient;
+        private bool _disposed;
+
+        public DefaultHttpClient(HttpClient httpClient)
+        {
+            _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
+        }
+
+        public Task<HttpResponseMessage> GetAsync(
+            Uri requestUri,
+            HttpCompletionOption completionOption,
+            CancellationToken cancellationToken = default)
+        {
+            if (requestUri == null)
+            {
+                throw new ArgumentNullException(nameof(requestUri));
+            }
+
+            if (!requestUri.IsAbsoluteUri)
+            {
+                throw new ArgumentException("Request URI must be absolute.", nameof(requestUri));
+            }
+
+            ThrowIfDisposed();
+
+            return _httpClient.GetAsync(requestUri, completionOption, cancellationToken);
+        }
+
+        public void Dispose()
+        {
+            if (_disposed)
+            {
+                return;
+            }
+
+            _httpClient.Dispose();
+            _disposed = true;
+        }
+
+        private void ThrowIfDisposed()
+        {
+            if (_disposed)
+            {
+                throw new ObjectDisposedException(nameof(DefaultHttpClient));
+            }
+        }
+    }
+}

AlayaCore/Errors/LauncherError.cs

@@ -0,0 +1,19 @@
+using System;
+using AlayaCore.Utilities.Enums;
+
+namespace AlayaCore.Errors
+{
+    public sealed class LauncherError
+    {
+        public LauncherErrorType Type { get; }
+        public string Message { get; }
+        public Exception Exception { get; }
+
+        public LauncherError(LauncherErrorType type, string message, Exception exception)
+        {
+            Type = type;
+            Message = message;
+            Exception = exception;
+        }
+    }
+}

AlayaCore/LaunchDirector.cs

@@ -8,7 +8,13 @@ using AlayaCore.Abstractions.Interfaces.Services;
 using AlayaCore.Installation;
 using AlayaCore.Models.Configuration;
 using AlayaCore.Models.Manifests;
+using AlayaCore.Models.Progress;
+using AlayaCore.Models.Results;
 using AlayaCore.States;
+using AlayaCore.Utilities.Enums;
+using CmlLib.Core;
+using CmlLib.Core.Installers;
+using Microsoft.Extensions.Logging;
 
 namespace AlayaCore
 {
@@ -17,51 +23,64 @@ namespace AlayaCore
         private readonly IManifestService _manifestService;
         private readonly IUpdateService _updateService;
         private readonly IInstallStateService _installStateService;
-        private readonly IJavaService _javaService;
         private readonly IModService _modService;
         private readonly IGameLaunchService _gameLaunchService;
+        private readonly IGameInstallService _gameInstallService;
+        private readonly ISettingsService _settingsService;
+        private readonly IAuthService _authService;
         private readonly LauncherOptions _options;
+        private readonly ILogger<LaunchDirector> _logger;
 
         public bool CanRun { get; private set; }
-
         public bool NeedsUpdating { get; private set; }
-
         public LaunchPlan? CurrentPlan { get; private set; }
 
+        public bool IsUpdatingLauncher { get; private set; }
+
         public LaunchDirector(
             IManifestService manifestService,
             IUpdateService updateService,
             IInstallStateService installStateService,
-            IJavaService javaService,
             IModService modService,
             IGameLaunchService gameLaunchService,
-            LauncherOptions options)
+            IGameInstallService gameInstallService,
+            ISettingsService settingsService,
+            IAuthService authService,
+            LauncherOptions options,
+            ILogger<LaunchDirector> logger)
         {
             _manifestService = manifestService ?? throw new ArgumentNullException(nameof(manifestService));
             _updateService = updateService ?? throw new ArgumentNullException(nameof(updateService));
             _installStateService = installStateService ?? throw new ArgumentNullException(nameof(installStateService));
-            _javaService = javaService ?? throw new ArgumentNullException(nameof(javaService));
             _modService = modService ?? throw new ArgumentNullException(nameof(modService));
             _gameLaunchService = gameLaunchService ?? throw new ArgumentNullException(nameof(gameLaunchService));
+            _gameInstallService = gameInstallService ?? throw new ArgumentNullException(nameof(gameInstallService));
+            _settingsService = settingsService ?? throw new ArgumentNullException(nameof(settingsService));
+            _authService = authService ?? throw new ArgumentNullException(nameof(authService));
             _options = options ?? throw new ArgumentNullException(nameof(options));
+            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
         }
 
         public async Task<LaunchPlan> EvaluateAsync(CancellationToken cancellationToken = default)
         {
             cancellationToken.ThrowIfCancellationRequested();
 
+            _logger.LogInformation("Evaluating launcher state.");
+
             bool launcherNeedsUpdate = await _updateService
                 .DoesLauncherNeedUpdating(cancellationToken)
                 .ConfigureAwait(false);
 
             if (launcherNeedsUpdate)
             {
+                _logger.LogInformation("Launcher update is required.");
+
                 LaunchPlan launcherUpdatePlan = new LaunchPlan(
                     launcherNeedsUpdate: true,
-                    javaNeedsInstallOrUpdate: false,
                     minecraftNeedsInstallOrUpdate: false,
                     neoforgeNeedsInstallOrUpdate: false,
-                    modsNeedSync: false);
+                    modsNeedSync: false,
+                    needAuthenticating: false);
 
                 ApplyPlan(launcherUpdatePlan);
                 return launcherUpdatePlan;
@@ -73,13 +92,13 @@ namespace AlayaCore
                 .GetCurrentEnvironmentAsync(cancellationToken)
                 .ConfigureAwait(false);
 
-            bool javaNeedsInstallOrUpdate =
+            bool needAuthenticating = !await _authService
-                _options.ForceReinstall ||
+                .IsAuthenticatedAsync(cancellationToken)
-                !environment.JavaInstalled ||
+                .ConfigureAwait(false);
-                !string.Equals(environment.JavaVersion, manifest.RequiredJavaVersion, StringComparison.OrdinalIgnoreCase);
 
             bool minecraftNeedsInstallOrUpdate =
                 _options.ForceReinstall ||
+                !environment.JavaInstalled ||
                 !environment.MinecraftInstalled ||
                 !string.Equals(environment.MinecraftVersion, manifest.MinecraftVersion, StringComparison.OrdinalIgnoreCase);
 
@@ -94,32 +113,56 @@ namespace AlayaCore
 
             LaunchPlan plan = new LaunchPlan(
                 launcherNeedsUpdate: false,
-                javaNeedsInstallOrUpdate: javaNeedsInstallOrUpdate,
                 minecraftNeedsInstallOrUpdate: minecraftNeedsInstallOrUpdate,
                 neoforgeNeedsInstallOrUpdate: neoforgeNeedsInstallOrUpdate,
-                modsNeedSync: modsNeedSync);
+                modsNeedSync: modsNeedSync,
+                needAuthenticating: needAuthenticating);
+
+            _logger.LogInformation(
+                "Launcher evaluation completed. State: {State}, NeedAuthenticating: {NeedAuthenticating}, ForceReinstall: {ForceReinstall}, MinecraftNeedsInstallOrUpdate: {MinecraftNeedsInstallOrUpdate}, NeoForgeNeedsInstallOrUpdate: {NeoForgeNeedsInstallOrUpdate}, ModsNeedSync: {ModsNeedSync}",
+                plan.State,
+                needAuthenticating,
+                _options.ForceReinstall,
+                minecraftNeedsInstallOrUpdate,
+                neoforgeNeedsInstallOrUpdate,
+                modsNeedSync);
 
             ApplyPlan(plan);
             return plan;
         }
 
-        public async Task InstallOrUpdateAsync(CancellationToken cancellationToken = default)
+        public async Task<InstallOrUpdateResult> InstallOrUpdateAsync(
+            CancellationToken cancellationToken = default,
+            IProgress<LauncherProgress>? progress = null)
         {
             cancellationToken.ThrowIfCancellationRequested();
 
+            IsUpdatingLauncher = false;
+
+            _logger.LogInformation("Starting install or update workflow.");
+            ReportProgress(progress, LaunchState.Checking, "Checking launcher state...");
+
             LaunchPlan plan = await EvaluateAsync(cancellationToken).ConfigureAwait(false);
 
             while (!plan.CanRun)
             {
                 cancellationToken.ThrowIfCancellationRequested();
 
-                ManifestModel? manifest = null;
+                _logger.LogInformation("Processing launch state {LaunchState}.", plan.State);
-                InstallEnvironment? environment = null;
+
+                ManifestModel manifest;
+                InstallEnvironment environment;
 
                 switch (plan.State)
                 {
                     case LaunchState.LauncherNeedsUpdate:
                     {
+                        IsUpdatingLauncher = true;
+
+                        _logger.LogWarning("Launcher updater handoff is beginning.");
+
+                        ReportProgress(progress, LaunchState.LauncherNeedsUpdate, "Launching updater...");
+
                         LauncherManifestModel launcherManifest = await _manifestService
                             .GetLauncherManifestAsync(cancellationToken)
                             .ConfigureAwait(false);
@@ -129,75 +172,163 @@ namespace AlayaCore
                             .ConfigureAwait(false);
 
                         ApplyPlan(plan);
-                        return;
+
+                        _logger.LogInformation("Updater launched successfully. Returning UpdaterLaunched result.");
+                        return InstallOrUpdateResult.UpdaterLaunched;
                     }
 
-                    case LaunchState.InstallJava:
+                    case LaunchState.NeedAuthenticating:
                     {
-                        manifest = await EnsureCurrentManifestAsync(cancellationToken).ConfigureAwait(false);
+                        _logger.LogInformation("Authentication is required.");
 
-                        environment = await _installStateService
+                        ReportProgress(progress, LaunchState.NeedAuthenticating, "Signing in...");
-                            .GetCurrentEnvironmentAsync(cancellationToken)
+
-                            .ConfigureAwait(false);
+                        await _authService
-
+                            .AuthenticateAsync(cancellationToken)
-                        await _javaService
-                            .EnsureValidJavaInstalledAsync(manifest, environment, cancellationToken)
                             .ConfigureAwait(false);
 
+                        _logger.LogInformation("Authentication completed successfully.");
                         break;
                     }
 
                     case LaunchState.InstallMinecraft:
                     {
-                        throw new NotImplementedException("Minecraft install/update flow has not been implemented yet.");
+                        _logger.LogInformation("Minecraft installation or repair is required.");
-                    }
 
-                    case LaunchState.InstallNeoforge:
+                        ReportProgress(progress, LaunchState.InstallMinecraft, "Preparing Minecraft installation...");
-                    {
-                        throw new NotImplementedException("NeoForge install/update flow has not been implemented yet.");
-                    }
 
-                    case LaunchState.SyncMods:
-                    {
                         manifest = await EnsureCurrentManifestAsync(cancellationToken).ConfigureAwait(false);
-
                         environment = await _installStateService
                             .GetCurrentEnvironmentAsync(cancellationToken)
                             .ConfigureAwait(false);
 
-                        await _modService
+                        EventHandler<InstallerProgressChangedEventArgs>? minecraftFileProgress =
-                            .ProcessModsAsync(manifest, environment, cancellationToken)
+                            CreateMinecraftFileProgressHandler(progress);
+
+                        EventHandler<ByteProgress>? minecraftByteProgress =
+                            CreateMinecraftByteProgressHandler(progress);
+
+                        await _gameInstallService
+                            .EnsureMinecraftInstalledAsync(
+                                manifest,
+                                environment,
+                                cancellationToken,
+                                minecraftFileProgress,
+                                minecraftByteProgress)
                             .ConfigureAwait(false);
 
+                        _logger.LogInformation("Minecraft installation or repair step completed.");
+                        break;
+                    }
+
+                    case LaunchState.InstallNeoforge:
+                    {
+                        _logger.LogInformation("NeoForge installation or repair is required.");
+
+                        ReportProgress(progress, LaunchState.InstallNeoforge, "Preparing NeoForge installation...");
+
+                        manifest = await EnsureCurrentManifestAsync(cancellationToken).ConfigureAwait(false);
+                        environment = await _installStateService
+                            .GetCurrentEnvironmentAsync(cancellationToken)
+                            .ConfigureAwait(false);
+
+                        IProgress<InstallerProgressChangedEventArgs>? neoForgeFileProgress =
+                            CreateNeoForgeFileProgress(progress);
+
+                        IProgress<ByteProgress>? neoForgeByteProgress =
+                            CreateNeoForgeByteProgress(progress);
+
+                        await _gameInstallService
+                            .EnsureNeoForgeInstalledAsync(
+                                manifest,
+                                environment,
+                                cancellationToken,
+                                neoForgeFileProgress,
+                                neoForgeByteProgress)
+                            .ConfigureAwait(false);
+
+                        _logger.LogInformation("NeoForge installation or repair step completed.");
+                        break;
+                    }
+
+                    case LaunchState.SyncMods:
+                    {
+                        _logger.LogInformation("Mod synchronization is required.");
+
+                        ReportProgress(progress, LaunchState.SyncMods, "Checking mod files...");
+
+                        manifest = await EnsureCurrentManifestAsync(cancellationToken).ConfigureAwait(false);
+                        environment = await _installStateService
+                            .GetCurrentEnvironmentAsync(cancellationToken)
+                            .ConfigureAwait(false);
+
+                        IProgress<DownloadProgress>? modProgress = CreateModProgress(progress);
+
+                        await _modService
+                            .ProcessModsAsync(manifest, environment, modProgress, cancellationToken)
+                            .ConfigureAwait(false);
+
+                        _logger.LogInformation("Mod synchronization step completed.");
                         break;
                     }
 
                     case LaunchState.Ready:
                     {
+                        _logger.LogDebug("Launch state is Ready inside install loop.");
                         break;
                     }
 
                     default:
                     {
+                        _logger.LogError("Unsupported launch state encountered: {LaunchState}.", plan.State);
                         throw new InvalidOperationException($"Unsupported launch state '{plan.State}'.");
                     }
                 }
 
                 plan = await EvaluateAsync(cancellationToken).ConfigureAwait(false);
             }
+
+            if (_options.ForceReinstall)
+            {
+                _logger.LogInformation("Force reinstall flag was set. Resetting it after successful install/update workflow.");
+
+                await _settingsService
+                    .SetForceReinstallAsync(false, cancellationToken)
+                    .ConfigureAwait(false);
+            }
+
+            plan = await EvaluateAsync(cancellationToken).ConfigureAwait(false);
+
+            if (!plan.CanRun)
+            {
+                _logger.LogError(
+                    "Install or update workflow completed, but launcher is still not runnable. Final state: {LaunchState}.",
+                    plan.State);
+
+                throw new InvalidOperationException("Install/update completed, but the launcher is still not in a runnable state.");
+            }
+
+            ReportProgress(progress, LaunchState.Ready, "Launcher is ready.");
+
+            _logger.LogInformation("Install or update workflow completed successfully. Launcher is ready.");
+            return InstallOrUpdateResult.Ready;
         }
 
         public async Task LaunchAsync(CancellationToken cancellationToken = default)
         {
             cancellationToken.ThrowIfCancellationRequested();
 
+            _logger.LogInformation("Launch requested.");
+
             if (CurrentPlan == null)
             {
+                _logger.LogDebug("No current launch plan was available. Evaluating launcher state before launch.");
                 await EvaluateAsync(cancellationToken).ConfigureAwait(false);
             }
 
             if (!CanRun)
             {
+                _logger.LogError("Launch was requested while the launcher was not in a runnable state.");
                 throw new InvalidOperationException("Launcher cannot run because installation or updates are still required.");
             }
 
@@ -207,33 +338,56 @@ namespace AlayaCore
 
             ManifestModel manifest = await EnsureCurrentManifestAsync(cancellationToken).ConfigureAwait(false);
 
+            _logger.LogInformation(
+                "Starting game launch. MinecraftVersion: {MinecraftVersion}, NeoForgeVersion: {NeoForgeVersion}",
+                environment.MinecraftVersion,
+                environment.NeoforgedVersion);
+
             await _gameLaunchService
                 .LaunchAsync(manifest, environment, cancellationToken)
                 .ConfigureAwait(false);
+
+            _logger.LogInformation("Game launch call completed.");
         }
 
         private async Task<ManifestModel> EnsureCurrentManifestAsync(CancellationToken cancellationToken)
         {
+            _logger.LogDebug("Ensuring current Alaya manifest is available.");
+
             ManifestModel? localManifest = await _manifestService
-                .GetLocalCoreManifestAsync(cancellationToken)
+                .GetLocalAlayaManifestAsync(cancellationToken)
                 .ConfigureAwait(false);
 
             Version remoteVersion = await _manifestService
                 .GetRemoteCoreManifestVersionAsync(cancellationToken)
                 .ConfigureAwait(false);
 
+            if (localManifest == null)
+            {
+                _logger.LogInformation("No local Alaya manifest was found. Downloading remote manifest.");
+            }
+            else if (localManifest.AlayaVersion != remoteVersion)
+            {
+                _logger.LogInformation(
+                    "Local Alaya manifest version {LocalVersion} differs from remote version {RemoteVersion}. Downloading updated manifest.",
+                    localManifest.AlayaVersion,
+                    remoteVersion);
+            }
+
             if (localManifest == null || localManifest.AlayaVersion != remoteVersion)
             {
                 localManifest = await _manifestService
-                    .GetCoreManifestAsync(cancellationToken)
+                    .GetAlayaManifestAsync(cancellationToken)
                     .ConfigureAwait(false);
             }
 
             if (localManifest == null)
             {
+                _logger.LogError("Local Alaya manifest was still unavailable after refresh.");
                 throw new FileNotFoundException("Local core manifest was not found after refresh.");
             }
 
+            _logger.LogDebug("Current Alaya manifest is available. Version: {AlayaVersion}", localManifest.AlayaVersion);
             return localManifest;
         }
 
@@ -250,7 +404,7 @@ namespace AlayaCore
             }
 
             var requiredMods = manifest.Files
-                .Where(file => file.Type == AlayaCore.Utilities.Enums.FileType.Mod)
+                .Where(file => file.Type == FileType.Mod)
                 .ToList();
 
             var installedMods = environment.InstalledModsManifest.Mods;
@@ -289,6 +443,129 @@ namespace AlayaCore
             CurrentPlan = plan ?? throw new ArgumentNullException(nameof(plan));
             NeedsUpdating = plan.NeedsUpdating;
             CanRun = plan.CanRun;
+
+            _logger.LogInformation(
+                "Applied launch plan. State: {LaunchState}, CanRun: {CanRun}, NeedsUpdating: {NeedsUpdating}, IsUpdatingLauncher: {IsUpdatingLauncher}",
+                plan.State,
+                CanRun,
+                NeedsUpdating,
+                IsUpdatingLauncher);
+        }
+
+        private static void ReportProgress(
+            IProgress<LauncherProgress>? progress,
+            LaunchState phase,
+            string statusMessage,
+            string? currentItemName = null,
+            long? bytesCompleted = null,
+            long? bytesTotal = null,
+            double? bytesPerSecond = null,
+            int? tasksCompleted = null,
+            int? tasksTotal = null)
+        {
+            progress?.Report(new LauncherProgress(
+                phase,
+                statusMessage,
+                currentItemName,
+                bytesCompleted,
+                bytesTotal,
+                bytesPerSecond,
+                tasksCompleted,
+                tasksTotal));
+        }
+
+        private static EventHandler<InstallerProgressChangedEventArgs>? CreateMinecraftFileProgressHandler(
+            IProgress<LauncherProgress>? progress)
+        {
+            if (progress == null)
+            {
+                return null;
+            }
+
+            return (_, args) =>
+            {
+                progress.Report(new LauncherProgress(
+                    phase: LaunchState.InstallMinecraft,
+                    statusMessage: args.EventType.ToString(),
+                    currentItemName: args.Name,
+                    tasksCompleted: args.ProgressedTasks,
+                    tasksTotal: args.TotalTasks));
+            };
+        }
+
+        private static EventHandler<ByteProgress>? CreateMinecraftByteProgressHandler(
+            IProgress<LauncherProgress>? progress)
+        {
+            if (progress == null)
+            {
+                return null;
+            }
+
+            return (_, args) =>
+            {
+                progress.Report(new LauncherProgress(
+                    phase: LaunchState.InstallMinecraft,
+                    statusMessage: "Downloading Minecraft files...",
+                    bytesCompleted: args.ProgressedBytes,
+                    bytesTotal: args.TotalBytes));
+            };
+        }
+
+        private static IProgress<InstallerProgressChangedEventArgs>? CreateNeoForgeFileProgress(
+            IProgress<LauncherProgress>? progress)
+        {
+            if (progress == null)
+            {
+                return null;
+            }
+
+            return new Progress<InstallerProgressChangedEventArgs>(args =>
+            {
+                progress.Report(new LauncherProgress(
+                    phase: LaunchState.InstallNeoforge,
+                    statusMessage: args.EventType.ToString(),
+                    currentItemName: args.Name,
+                    tasksCompleted: args.ProgressedTasks,
+                    tasksTotal: args.TotalTasks));
+            });
+        }
+
+        private static IProgress<ByteProgress>? CreateNeoForgeByteProgress(
+            IProgress<LauncherProgress>? progress)
+        {
+            if (progress == null)
+            {
+                return null;
+            }
+
+            return new Progress<ByteProgress>(args =>
+            {
+                progress.Report(new LauncherProgress(
+                    phase: LaunchState.InstallNeoforge,
+                    statusMessage: "Downloading NeoForge files...",
+                    bytesCompleted: args.ProgressedBytes,
+                    bytesTotal: args.TotalBytes));
+            });
+        }
+
+        private static IProgress<DownloadProgress>? CreateModProgress(
+            IProgress<LauncherProgress>? progress)
+        {
+            if (progress == null)
+            {
+                return null;
+            }
+
+            return new Progress<DownloadProgress>(downloadProgress =>
+            {
+                progress.Report(new LauncherProgress(
+                    phase: LaunchState.SyncMods,
+                    statusMessage: downloadProgress.StatusMessage ?? "Downloading mod...",
+                    currentItemName: downloadProgress.FileName,
+                    bytesCompleted: downloadProgress.BytesDownloaded,
+                    bytesTotal: downloadProgress.TotalBytes,
+                    bytesPerSecond: downloadProgress.BytesPerSecond));
+            });
         }
     }
 }

AlayaCore/Models/AlayaPath.cs

@@ -0,0 +1,27 @@
+using System;
+using System.IO;
+using AlayaCore.Abstractions.Interfaces;
+using AlayaCore.Utilities.Enums;
+using CmlLib.Core;
+
+namespace AlayaCore.Models
+{
+    public class AlayaPath : MinecraftPath
+    {
+        public AlayaPath(IFileStore fileStore)
+        {
+            BasePath = NormalizePath(fileStore.Get(FolderLocation.Game));
+            
+            Library = NormalizePath(BasePath + "/libraries");
+            Versions = NormalizePath(BasePath + "/versions");
+            Resource = NormalizePath(BasePath + "/resources");
+
+            Runtime = NormalizePath(fileStore.GetOrCreate(FolderLocation.JavaRuntime));
+            Assets = NormalizePath(BasePath + "/assets");
+
+            CreateDirs();
+            
+            
+        }
+    }
+}

AlayaCore/Models/Configuration/GameOptions.cs

@@ -0,0 +1,29 @@
+using AlayaCore.Abstractions.Configuration;
+
+namespace AlayaCore.Models.Configuration
+{
+    public sealed class GameOptions : BaseConfig
+    {
+        public override string FileName => "Game.json";
+
+        public string? LaunchVersion { get; set; } = null;
+
+        public int MinimumRamMb { get; set; } = 1024;
+        public int MaximumRamMb { get; set; } = 2048;
+
+        public int ScreenWidth { get; set; } = 1920;
+        public int ScreenHeight { get; set; } = 1080;
+
+        public bool Fullscreen { get; set; } = false;
+
+        public static GameOptions Default { get; } = new GameOptions
+        {
+            LaunchVersion = null,
+            MinimumRamMb = 1024,
+            MaximumRamMb = 2048,
+            ScreenWidth = 1920,
+            ScreenHeight = 1080,
+            Fullscreen = false
+        };
+    }
+}

AlayaCore/Models/Configuration/LauncherOptions.cs

@@ -1,7 +1,16 @@
+using AlayaCore.Abstractions.Configuration;
+
 namespace AlayaCore.Models.Configuration
 {
-    public sealed class LauncherOptions
+    public sealed class LauncherOptions : BaseConfig
     {
-        public bool ForceReinstall { get; set; }
+        public bool ForceReinstall { get; set; } = false;
+
+        public override string FileName => "Launcher.json";
+        
+        public static LauncherOptions Default { get; } = new LauncherOptions
+        {
+            ForceReinstall = false,
+        };
     }
 }

AlayaCore/Models/Configuration/LauncherUpdateServiceOptions.cs

@@ -1,3 +1,6 @@
+using System;
+using System.IO;
+
 namespace AlayaCore.Models.Configuration
 {
     public sealed class LauncherUpdateServiceOptions
@@ -10,5 +13,8 @@ namespace AlayaCore.Models.Configuration
 
         public string AlayaUpdaterPath { get; set; }
         public bool ForceUpdate { get; set; }
+
+        public static LauncherUpdateServiceOptions Default { get; } =
+            new LauncherUpdateServiceOptions(Path.Combine(AppContext.BaseDirectory, "Data", "Updater"), false);
     }
 }

AlayaCore/Models/Configuration/ManifestServiceOptions.cs

@@ -4,25 +4,23 @@ namespace AlayaCore.Models.Configuration
 {
     public sealed class ManifestServiceOptions
     {
-        public Uri CoreManifestUri { get; }
+        public Uri AlayaManifestUri { get; }
         public Uri LauncherManifestUri { get; }
-        public string CoreManifestSha512Hash { get; }
+        public string AlayaManifestSha512Hash { get; }
         public string LauncherManifestSha512Hash { get; }
-        public string ManifestDirectoryPath { get; }
 
         public ManifestServiceOptions(
-            Uri coreManifestUri,
+            Uri alayaManifestUri,
             Uri launcherManifestUri,
-            string coreManifestSha512Hash,
+            string alayaManifestSha512Hash,
-            string launcherManifestSha512Hash,
+            string launcherManifestSha512Hash)
-            string manifestDirectoryPath)
         {
-            CoreManifestUri = coreManifestUri ?? throw new ArgumentNullException(nameof(coreManifestUri));
+            AlayaManifestUri = alayaManifestUri ?? throw new ArgumentNullException(nameof(alayaManifestUri));
             LauncherManifestUri = launcherManifestUri ?? throw new ArgumentNullException(nameof(launcherManifestUri));
 
-            if (!CoreManifestUri.IsAbsoluteUri)
+            if (!AlayaManifestUri.IsAbsoluteUri)
             {
-                throw new ArgumentException("Core manifest URI must be absolute.", nameof(coreManifestUri));
+                throw new ArgumentException("Core manifest URI must be absolute.", nameof(alayaManifestUri));
             }
 
             if (!LauncherManifestUri.IsAbsoluteUri)
@@ -30,9 +28,9 @@ namespace AlayaCore.Models.Configuration
                 throw new ArgumentException("Launcher manifest URI must be absolute.", nameof(launcherManifestUri));
             }
 
-            if (string.IsNullOrWhiteSpace(coreManifestSha512Hash))
+            if (string.IsNullOrWhiteSpace(alayaManifestSha512Hash))
             {
-                throw new ArgumentException("Core manifest SHA-512 hash cannot be null, empty, or whitespace.", nameof(coreManifestSha512Hash));
+                throw new ArgumentException("Core manifest SHA-512 hash cannot be null, empty, or whitespace.", nameof(alayaManifestSha512Hash));
             }
 
             if (string.IsNullOrWhiteSpace(launcherManifestSha512Hash))
@@ -40,14 +38,12 @@ namespace AlayaCore.Models.Configuration
                 throw new ArgumentException("Launcher manifest SHA-512 hash cannot be null, empty, or whitespace.", nameof(launcherManifestSha512Hash));
             }
 
-            if (string.IsNullOrWhiteSpace(manifestDirectoryPath))
+            AlayaManifestSha512Hash = alayaManifestSha512Hash;
-            {
-                throw new ArgumentException("Manifest directory path cannot be null, empty, or whitespace.", nameof(manifestDirectoryPath));
-            }
-
-            CoreManifestSha512Hash = coreManifestSha512Hash;
             LauncherManifestSha512Hash = launcherManifestSha512Hash;
-            ManifestDirectoryPath = manifestDirectoryPath;
         }
+
+        public static ManifestServiceOptions Default { get; } = new ManifestServiceOptions(
+            new Uri("INSERT-ALAYA-URL", UriKind.Absolute),
+            new Uri("INSERT-LAUNCHER-URL", UriKind.Absolute), "INSERT-ALAYA-HASH", "INSERT-LAUNCHER-HASH");
     }
 }

AlayaCore/Models/Configuration/ModrinthConnectionOptions.cs

@@ -8,5 +8,8 @@ namespace AlayaCore.Models.Configuration
         }
 
         public string BaseApiUrl { get; }
+
+        public static ModrinthConnectionOptions Default { get; } =
+            new ModrinthConnectionOptions("https://api.modrinth.com/v2/");
     }
 }

AlayaCore/Models/Configuration/RetryPolicyOptions.cs

@@ -0,0 +1,12 @@
+namespace AlayaCore.Models.Configuration
+{
+    public sealed class RetryPolicyOptions
+    {
+        public int MaxAttempts { get; set; } = 3;
+        public int BaseDelayMilliseconds { get; set; } = 500;
+        public double BackoffMultiplier { get; set; } = 2.0;
+        public int MaxDelayMilliseconds { get; set; } = 3000;
+        
+        public static  RetryPolicyOptions Default { get; } = new();
+    }
+}

AlayaCore/Models/Manifests/DTO/ManifestDto.cs

@@ -20,19 +20,21 @@ namespace AlayaCore.Models.Manifests.DTO
         [JsonConverter(typeof(UriConverter))]
         public Uri RequiredJavaUrl { get; set; } = null!;
         
+        [JsonProperty("javaArchiveHash", Required = Required.Always)]
+        public string JavaArchiveHash { get; set; } = string.Empty;
+
         [JsonProperty("minecraftVersion", Required = Required.Always)]
         public string MinecraftVersion { get; set; } = string.Empty;
 
-        [JsonProperty("minecraftUrl", Required = Required.Always)]
-        [JsonConverter(typeof(UriConverter))]
-        public Uri MinecraftUrl { get; set; } = null!;
-
         [JsonProperty("neoforgedVersion", Required = Required.Always)]
         public string NeoforgedVersion { get; set; } = string.Empty;
         
-        [JsonProperty("neoforgedUrl", Required = Required.Always)]
+        [JsonProperty("serverUrl", Required = Required.Always)]
         [JsonConverter(typeof(UriConverter))]
-        public Uri NeoforgedUrl { get; set; } = null!;
+        public Uri ServerUrl { get; set; } = null!;
+        
+        [JsonProperty("serverPort", Required = Required.Always)]
+        public int ServerPort { get; }
 
         [JsonProperty("files", Required = Required.Always)]
         public List<ModFileEntryDto> Files { get; set; } = new List<ModFileEntryDto>();

AlayaCore/Models/Manifests/LauncherManifestModel.cs

@@ -4,9 +4,9 @@ namespace AlayaCore.Models.Manifests
 {
     public sealed class LauncherManifestModel
     {
-        public Version Version { get; }
+        public Version? Version { get; }
         public string Sha512Hash { get; }
-        public Uri DownloadUri { get; }
+        public Uri? DownloadUri { get; }
 
         public LauncherManifestModel(
             Version version,

AlayaCore/Models/Manifests/ManifestModel.cs

@@ -9,33 +9,26 @@ namespace AlayaCore.Models.Manifests
     public sealed class ManifestModel
     {
         public Version AlayaVersion { get; }
-        public string RequiredJavaVersion { get; }
-        public Uri RequiredJavaUrl { get; }
         public string MinecraftVersion { get; }
-        public Uri MinecraftUrl { get; }
         public string NeoforgedVersion { get; }
-        public Uri NeoforgedUrl { get; }
+        
+        public Uri? ServerUrl { get; }
+        public int ServerPort { get; }
         public IReadOnlyList<ModFileEntry> Files { get; }
 
         public ManifestModel(
             Version alayaVersion,
-            string requiredJavaVersion,
-            Uri requiredJavaUrl,
             string minecraftVersion,
-            Uri minecraftUrl,
             string neoforgedVersion,
-            Uri neoforgedUrl,
+            Uri serverUrl,
+            int serverPort,
             IEnumerable<ModFileEntry> files)
         {
             AlayaVersion = alayaVersion ?? throw new ArgumentNullException(nameof(alayaVersion));
-            RequiredJavaVersion = RequireNonEmpty(requiredJavaVersion, nameof(requiredJavaVersion));
-            RequiredJavaUrl = requiredJavaUrl ?? throw new ArgumentNullException(nameof(requiredJavaUrl));
 
             MinecraftVersion = RequireNonEmpty(minecraftVersion, nameof(minecraftVersion));
-            MinecraftUrl = minecraftUrl ?? throw new ArgumentNullException(nameof(minecraftUrl));
 
             NeoforgedVersion = RequireNonEmpty(neoforgedVersion, nameof(neoforgedVersion));
-            NeoforgedUrl = neoforgedUrl ?? throw new ArgumentNullException(nameof(neoforgedUrl));
 
             if (files == null)
             {

AlayaCore/Models/Progress/LauncherProgress.cs

@@ -1,27 +1,62 @@
-using System;
+using AlayaCore.States;
-using AlayaCore.Utilities.Enums;
 
 namespace AlayaCore.Models.Progress
 {
     public sealed class LauncherProgress
     {
-        public LauncherStage Stage { get; }
+        public LaunchState Phase { get; }
         public string StatusMessage { get; }
-        public double? PercentComplete { get; }
+        public string? CurrentItemName { get; }
+
+        public long? BytesCompleted { get; }
+        public long? BytesTotal { get; }
+        public double? BytesPerSecond { get; }
+
+        public int? TasksCompleted { get; }
+        public int? TasksTotal { get; }
+
+        public double? PercentComplete
+        {
+            get
+            {
+                if (BytesCompleted.HasValue && BytesTotal.HasValue && BytesTotal.Value > 0)
+                {
+                    return (double)BytesCompleted.Value / BytesTotal.Value * 100d;
+                }
+
+                if (TasksCompleted.HasValue && TasksTotal.HasValue && TasksTotal.Value > 0)
+                {
+                    return (double)TasksCompleted.Value / TasksTotal.Value * 100d;
+                }
+
+                return null;
+            }
+        }
 
         public LauncherProgress(
-            LauncherStage stage,
+            LaunchState phase,
             string statusMessage,
-            double? percentComplete = null)
+            string? currentItemName = null,
+            long? bytesCompleted = null,
+            long? bytesTotal = null,
+            double? bytesPerSecond = null,
+            int? tasksCompleted = null,
+            int? tasksTotal = null)
         {
+
             if (string.IsNullOrWhiteSpace(statusMessage))
             {
-                throw new ArgumentException("Status message cannot be null or empty.", nameof(statusMessage));
+                throw new System.ArgumentException("Status message cannot be null, empty, or whitespace.", nameof(statusMessage));
             }
 
-            Stage = stage;
+            Phase = phase;
             StatusMessage = statusMessage;
-            PercentComplete = percentComplete;
+            CurrentItemName = currentItemName;
+            BytesCompleted = bytesCompleted;
+            BytesTotal = bytesTotal;
+            BytesPerSecond = bytesPerSecond;
+            TasksCompleted = tasksCompleted;
+            TasksTotal = tasksTotal;
         }
     }
 }

AlayaCore/Models/Results/InstallOrUpdateResult.cs

@@ -0,0 +1,8 @@
+namespace AlayaCore.Models.Results
+{
+    public enum InstallOrUpdateResult
+    {
+        Ready,
+        UpdaterLaunched
+    }
+}

AlayaCore/Policies/RetryPolicy.cs

@@ -0,0 +1,216 @@
+using System;
+using System.IO;
+using System.Net.Http;
+using System.Threading;
+using System.Threading.Tasks;
+using AlayaCore.Abstractions.Interfaces.Policies;
+using AlayaCore.Models.Configuration;
+using Microsoft.Extensions.Logging;
+
+namespace AlayaCore.Services
+{
+    public sealed class RetryPolicy : IRetryPolicy
+    {
+        private readonly RetryPolicyOptions _options;
+        private readonly ILogger<RetryPolicy> _logger;
+        
+        private static readonly Random _random = new Random();
+
+        public RetryPolicy(
+            RetryPolicyOptions options,
+            ILogger<RetryPolicy> logger)
+        {
+            _options = options ?? throw new ArgumentNullException(nameof(options));
+            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        }
+
+        public async Task ExecuteAsync(
+            Func<CancellationToken, Task> operation,
+            string operationName,
+            CancellationToken cancellationToken = default)
+        {
+            if (operation == null)
+            {
+                throw new ArgumentNullException(nameof(operation));
+            }
+
+            if (string.IsNullOrWhiteSpace(operationName))
+            {
+                throw new ArgumentException("Operation name cannot be null, empty, or whitespace.", nameof(operationName));
+            }
+
+            await ExecuteAsync<object?>(
+                async token =>
+                {
+                    await operation(token).ConfigureAwait(false);
+                    return null;
+                },
+                operationName,
+                cancellationToken).ConfigureAwait(false);
+        }
+
+        public async Task<T> ExecuteAsync<T>(
+            Func<CancellationToken, Task<T>> operation,
+            string operationName,
+            CancellationToken cancellationToken = default)
+        {
+            if (operation == null)
+            {
+                throw new ArgumentNullException(nameof(operation));
+            }
+
+            if (string.IsNullOrWhiteSpace(operationName))
+            {
+                throw new ArgumentException("Operation name cannot be null, empty, or whitespace.", nameof(operationName));
+            }
+
+            ValidateOptions();
+
+            Exception? lastException = null;
+
+            for (int attempt = 1; attempt <= _options.MaxAttempts; attempt++)
+            {
+                cancellationToken.ThrowIfCancellationRequested();
+
+                try
+                {
+                    if (attempt > 1)
+                    {
+                        _logger.LogInformation(
+                            "Retrying operation {OperationName}. Attempt {Attempt} of {MaxAttempts}.",
+                            operationName,
+                            attempt,
+                            _options.MaxAttempts);
+                    }
+
+                    return await operation(cancellationToken).ConfigureAwait(false);
+                }
+                catch (OperationCanceledException ex) when (!cancellationToken.IsCancellationRequested && IsRetryable(ex))
+                {
+                    lastException = ex;
+
+                    if (attempt == _options.MaxAttempts)
+                    {
+                        _logger.LogError(
+                            ex,
+                            "Operation {OperationName} failed after {MaxAttempts} attempts due to repeated timeout or cancellation-like transient failures.",
+                            operationName,
+                            _options.MaxAttempts);
+
+                        throw;
+                    }
+
+                    TimeSpan delay = CalculateDelay(attempt);
+
+                    _logger.LogWarning(
+                        ex,
+                        "Operation {OperationName} timed out or was transiently cancelled on attempt {Attempt} of {MaxAttempts}. Retrying after {DelayMs}ms.",
+                        operationName,
+                        attempt,
+                        _options.MaxAttempts,
+                        (int)delay.TotalMilliseconds);
+
+                    await Task.Delay(delay, cancellationToken).ConfigureAwait(false);
+                }
+                catch (OperationCanceledException)
+                {
+                    _logger.LogInformation(
+                        "Operation {OperationName} was cancelled by the caller.",
+                        operationName);
+
+                    throw;
+                }
+                catch (Exception ex) when (IsRetryable(ex))
+                {
+                    lastException = ex;
+
+                    if (attempt == _options.MaxAttempts)
+                    {
+                        _logger.LogError(
+                            ex,
+                            "Operation {OperationName} failed after {MaxAttempts} attempts.",
+                            operationName,
+                            _options.MaxAttempts);
+
+                        throw;
+                    }
+
+                    TimeSpan delay = CalculateDelay(attempt);
+
+                    _logger.LogWarning(
+                        ex,
+                        "Operation {OperationName} failed with a transient error on attempt {Attempt} of {MaxAttempts}. Retrying after {DelayMs}ms.",
+                        operationName,
+                        attempt,
+                        _options.MaxAttempts,
+                        (int)delay.TotalMilliseconds);
+
+                    await Task.Delay(delay, cancellationToken).ConfigureAwait(false);
+                }
+                catch (Exception ex)
+                {
+                    _logger.LogError(
+                        ex,
+                        "Operation {OperationName} failed with a non-retryable error on attempt {Attempt}.",
+                        operationName,
+                        attempt);
+
+                    throw;
+                }
+            }
+
+            throw new InvalidOperationException(
+                $"Retry policy exited unexpectedly for operation '{operationName}'.",
+                lastException);
+        }
+
+        private void ValidateOptions()
+        {
+            if (_options.MaxAttempts <= 0)
+            {
+                throw new InvalidOperationException("RetryPolicyOptions.MaxAttempts must be greater than zero.");
+            }
+
+            if (_options.BaseDelayMilliseconds < 0)
+            {
+                throw new InvalidOperationException("RetryPolicyOptions.BaseDelayMilliseconds cannot be negative.");
+            }
+
+            if (_options.BackoffMultiplier < 1d)
+            {
+                throw new InvalidOperationException("RetryPolicyOptions.BackoffMultiplier must be greater than or equal to 1.");
+            }
+
+            if (_options.MaxDelayMilliseconds < 0)
+            {
+                throw new InvalidOperationException("RetryPolicyOptions.MaxDelayMilliseconds cannot be negative.");
+            }
+        }
+
+        private static bool IsRetryable(Exception exception)
+        {
+            return exception switch
+            {
+                HttpRequestException => true,
+                IOException => true,
+                TaskCanceledException => true,
+                InvalidDataException => false,
+                ArgumentException => false,
+                InvalidOperationException => false,
+                _ => false
+            };
+        }
+
+        private TimeSpan CalculateDelay(int attempt)
+        {
+            double exponentialDelay = _options.BaseDelayMilliseconds *
+                                      Math.Pow(_options.BackoffMultiplier, attempt - 1);
+
+            double cappedDelay = Math.Min(exponentialDelay, _options.MaxDelayMilliseconds);
+
+            int jitterMilliseconds = _random.Next(0, 150);
+
+            return TimeSpan.FromMilliseconds(cappedDelay + jitterMilliseconds);
+        }
+    }
+}

AlayaCore/Services/AuthService.cs

@@ -0,0 +1,200 @@
+using System;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+using AlayaCore.Abstractions.Interfaces;
+using AlayaCore.Abstractions.Interfaces.Services;
+using AlayaCore.Utilities.Enums;
+using CmlLib.Core.Auth;
+using CmlLib.Core.Auth.Microsoft;
+using Microsoft.Extensions.Logging;
+using Microsoft.Identity.Client;
+using XboxAuthNet.Game.Msal;
+using XboxAuthNet.Game.Msal.OAuth;
+
+namespace AlayaCore.Services
+{
+    public sealed class AuthService : IAuthService
+    {
+        private readonly IFileStore _fileStore;
+        private readonly ILogger<AuthService> _logger;
+
+        private MSession? _session;
+        private IPublicClientApplication? _clientApp;
+        private JELoginHandler? _loginHandler;
+
+        public AuthService(
+            IFileStore fileStore,
+            ILogger<AuthService> logger)
+        {
+            _fileStore = fileStore ?? throw new ArgumentNullException(nameof(fileStore));
+            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        }
+
+        public async Task<bool> IsAuthenticatedAsync(CancellationToken cancellationToken = default)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+
+            if (_session != null && _session.CheckIsValid())
+            {
+                _logger.LogDebug("Authentication check succeeded using the cached in-memory session.");
+                return true;
+            }
+
+            _logger.LogDebug("No valid cached in-memory session was found. Attempting silent authentication check.");
+
+            try
+            {
+                JELoginHandler loginHandler = await BuildHandlerAsync().ConfigureAwait(false);
+
+                _session = await loginHandler
+                    .AuthenticateSilently(cancellationToken: cancellationToken)
+                    .ConfigureAwait(false);
+
+                bool isAuthenticated = _session != null && _session.CheckIsValid();
+
+                if (isAuthenticated)
+                {
+                    _logger.LogInformation("Silent authentication check succeeded.");
+                }
+                else
+                {
+                    _logger.LogWarning("Silent authentication completed but did not produce a valid Minecraft session.");
+                }
+
+                return isAuthenticated;
+            }
+            catch (OperationCanceledException)
+            {
+                _logger.LogInformation("Authentication check was cancelled.");
+                throw;
+            }
+            catch (Exception ex)
+            {
+                _session = null;
+                _logger.LogInformation(ex, "Silent authentication check failed. The user is not currently authenticated.");
+                return false;
+            }
+        }
+
+        public async Task AuthenticateAsync(CancellationToken cancellationToken = default)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+
+            _logger.LogInformation("Starting authentication flow.");
+
+            JELoginHandler loginHandler = await BuildHandlerAsync().ConfigureAwait(false);
+
+            try
+            {
+                _logger.LogDebug("Attempting silent authentication.");
+
+                _session = await loginHandler
+                    .AuthenticateSilently(cancellationToken: cancellationToken)
+                    .ConfigureAwait(false);
+
+                if (_session != null && _session.CheckIsValid())
+                {
+                    _logger.LogInformation("Silent authentication succeeded.");
+                }
+                else
+                {
+                    _logger.LogWarning("Silent authentication completed but did not return a valid session.");
+                }
+            }
+            catch (OperationCanceledException)
+            {
+                _logger.LogInformation("Authentication was cancelled during silent authentication.");
+                throw;
+            }
+            catch (Exception ex)
+            {
+                _logger.LogInformation(ex, "Silent authentication failed. Falling back to interactive authentication.");
+
+                _session = await loginHandler
+                    .AuthenticateInteractively(cancellationToken: cancellationToken)
+                    .ConfigureAwait(false);
+
+                if (_session != null && _session.CheckIsValid())
+                {
+                    _logger.LogInformation("Interactive authentication succeeded.");
+                }
+                else
+                {
+                    _logger.LogWarning("Interactive authentication completed but did not return a valid session.");
+                }
+            }
+
+            if (_session == null || !_session.CheckIsValid())
+            {
+                _logger.LogError("Authentication failed because no valid Minecraft session was produced.");
+                throw new InvalidOperationException("Authentication did not produce a valid Minecraft session.");
+            }
+        }
+
+        public async Task SignOutAsync(CancellationToken cancellationToken = default)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+
+            _logger.LogInformation("Signing out the current user.");
+
+            JELoginHandler loginHandler = await BuildHandlerAsync().ConfigureAwait(false);
+
+            await loginHandler.Signout(cancellationToken).ConfigureAwait(false);
+            _session = null;
+
+            _logger.LogInformation("Sign-out completed and cached session was cleared.");
+        }
+
+        public async Task<MSession> GetSessionAsync(CancellationToken cancellationToken = default)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+
+            if (_session != null && _session.CheckIsValid())
+            {
+                _logger.LogDebug("Returning a valid cached Minecraft session.");
+                return _session;
+            }
+
+            _logger.LogDebug("No valid cached session was available. Attempting authentication before returning a session.");
+
+            await AuthenticateAsync(cancellationToken).ConfigureAwait(false);
+
+            if (_session == null || !_session.CheckIsValid())
+            {
+                _logger.LogError("A valid Minecraft session was not available after authentication.");
+                throw new InvalidOperationException("No valid Minecraft session is available.");
+            }
+
+            _logger.LogDebug("Returning Minecraft session obtained from authentication flow.");
+            return _session;
+        }
+
+        private async Task<JELoginHandler> BuildHandlerAsync()
+        {
+            if (_loginHandler != null)
+            {
+                _logger.LogDebug("Reusing existing JELoginHandler instance.");
+                return _loginHandler;
+            }
+
+            string accountDirectory = _fileStore.GetOrCreate(FolderLocation.Data);
+            string accountFilePath = Path.Combine(accountDirectory, "accounts.json");
+
+            _logger.LogInformation("Building MSAL client and login handler. Account cache path: {AccountFilePath}", accountFilePath);
+
+            _clientApp = await MsalClientHelper
+                .BuildApplicationWithCache("d91042d4-3eb5-43e4-b3ed-600e1d0760ff")
+                .ConfigureAwait(false);
+
+            _loginHandler = new JELoginHandlerBuilder()
+                .WithOAuthProvider(new MsalCodeFlowProvider(_clientApp))
+                .WithAccountManager(accountFilePath)
+                .Build();
+
+            _logger.LogInformation("MSAL client and JELoginHandler were created successfully.");
+
+            return _loginHandler;
+        }
+    }
+}

AlayaCore/Services/DownloadService.cs

@@ -1,266 +0,0 @@
-using System;
-using System.Diagnostics;
-using System.IO;
-using System.Net.Http;
-using System.Security.Cryptography;
-using System.Threading;
-using System.Threading.Tasks;
-using AlayaCore.Abstractions.Interfaces.Clients;
-using AlayaCore.Abstractions.Interfaces.Services;
-using AlayaCore.Models.Progress;
-using AlayaCore.Models.Results;
-
-namespace AlayaCore.Services
-{
-    public sealed class DownloadService : IDownloadService
-    {
-        private const int BUFFER_SIZE = 81920;
-
-        private readonly IHttpClient _httpClient;
-
-        public DownloadService(IHttpClient httpClient)
-        {
-            _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
-        }
-
-        public async Task<DownloadResult> DownloadFileAsync(
-            Uri sourceUri,
-            string destinationPath,
-            string sha512Hash,
-            IProgress<DownloadProgress>? progress = null,
-            CancellationToken cancellationToken = default)
-        {
-            if (sourceUri == null)
-            {
-                throw new ArgumentNullException(nameof(sourceUri));
-            }
-
-            if (!sourceUri.IsAbsoluteUri)
-            {
-                throw new ArgumentException("Source URI must be absolute.", nameof(sourceUri));
-            }
-
-            if (string.IsNullOrWhiteSpace(destinationPath))
-            {
-                throw new ArgumentException("Destination path cannot be null, empty, or whitespace.", nameof(destinationPath));
-            }
-
-            if (string.IsNullOrWhiteSpace(sha512Hash))
-            {
-                throw new ArgumentException("SHA-512 hash cannot be null, empty, or whitespace.", nameof(sha512Hash));
-            }
-
-            cancellationToken.ThrowIfCancellationRequested();
-
-            string normalizedExpectedHash = NormalizeHash(sha512Hash);
-            string fileName = Path.GetFileName(destinationPath);
-
-            if (string.IsNullOrWhiteSpace(fileName))
-            {
-                throw new ArgumentException("Destination path must include a file name.", nameof(destinationPath));
-            }
-
-            EnsureDestinationDirectoryExists(destinationPath);
-
-            if (File.Exists(destinationPath) && VerifyFileHash(destinationPath, normalizedExpectedHash))
-            {
-                long existingLength = new FileInfo(destinationPath).Length;
-
-                progress?.Report(new DownloadProgress(
-                    fileName: fileName,
-                    destinationPath: destinationPath,
-                    bytesDownloaded: existingLength,
-                    totalBytes: existingLength,
-                    bytesPerSecond: null,
-                    statusMessage: "File already present and valid."));
-
-                return new DownloadResult(
-                    destinationPath,
-                    DownloadOutcome.SkippedAlreadyValid,
-                    hashVerified: true,
-                    bytesDownloaded: 0);
-            }
-
-            bool destinationExisted = File.Exists(destinationPath);
-            string tempFilePath = destinationPath + ".download";
-
-            DeleteFileIfExists(tempFilePath);
-
-            try
-            {
-                using HttpResponseMessage response = await _httpClient.GetAsync(
-                    sourceUri,
-                    HttpCompletionOption.ResponseHeadersRead,
-                    cancellationToken);
-
-                response.EnsureSuccessStatusCode();
-
-                long? totalBytes = response.Content.Headers.ContentLength;
-                long bytesDownloaded = 0;
-
-                progress?.Report(new DownloadProgress(
-                    fileName: fileName,
-                    destinationPath: destinationPath,
-                    bytesDownloaded: 0,
-                    totalBytes: totalBytes,
-                    bytesPerSecond: null,
-                    statusMessage: "Starting download..."));
-
-                using Stream responseStream = await response.Content.ReadAsStreamAsync();
-                using FileStream fileStream = new FileStream(
-                    tempFilePath,
-                    FileMode.Create,
-                    FileAccess.Write,
-                    FileShare.None,
-                    BUFFER_SIZE,
-                    useAsync: true);
-                using SHA512 sha512 = SHA512.Create();
-
-                byte[] buffer = new byte[BUFFER_SIZE];
-                Stopwatch stopwatch = Stopwatch.StartNew();
-
-                while (true)
-                {
-                    int bytesRead = await responseStream.ReadAsync(
-                        buffer,
-                        0,
-                        buffer.Length,
-                        cancellationToken);
-
-                    if (bytesRead == 0)
-                    {
-                        break;
-                    }
-
-                    await fileStream.WriteAsync(
-                        buffer,
-                        0,
-                        bytesRead,
-                        cancellationToken);
-
-                    sha512.TransformBlock(buffer, 0, bytesRead, null, 0);
-
-                    bytesDownloaded += bytesRead;
-
-                    double? bytesPerSecond = null;
-                    if (stopwatch.Elapsed.TotalSeconds > 0d)
-                    {
-                        bytesPerSecond = bytesDownloaded / stopwatch.Elapsed.TotalSeconds;
-                    }
-
-                    progress?.Report(new DownloadProgress(
-                        fileName: fileName,
-                        destinationPath: destinationPath,
-                        bytesDownloaded: bytesDownloaded,
-                        totalBytes: totalBytes,
-                        bytesPerSecond: bytesPerSecond,
-                        statusMessage: "Downloading file..."));
-                }
-
-                sha512.TransformFinalBlock(Array.Empty<byte>(), 0, 0);
-                await fileStream.FlushAsync(cancellationToken);
-
-                string actualHash = ConvertToLowerHex(sha512.Hash);
-                
-                if (!string.Equals(actualHash, normalizedExpectedHash, StringComparison.OrdinalIgnoreCase))
-                {
-                    throw new InvalidDataException(
-                        $"Downloaded file hash mismatch. Expected '{normalizedExpectedHash}', got '{actualHash}'.");
-                }
-
-                ReplaceDestinationFile(tempFilePath, destinationPath);
-
-                double? finalBytesPerSecond = null;
-                if (stopwatch.Elapsed.TotalSeconds > 0d)
-                {
-                    finalBytesPerSecond = bytesDownloaded / stopwatch.Elapsed.TotalSeconds;
-                }
-
-                progress?.Report(new DownloadProgress(
-                    fileName: fileName,
-                    destinationPath: destinationPath,
-                    bytesDownloaded: bytesDownloaded,
-                    totalBytes: totalBytes ?? bytesDownloaded,
-                    bytesPerSecond: finalBytesPerSecond,
-                    statusMessage: "Download complete."));
-
-                return new DownloadResult(
-                    destinationPath,
-                    destinationExisted ? DownloadOutcome.ReplacedInvalid : DownloadOutcome.Downloaded,
-                    hashVerified: true,
-                    bytesDownloaded: bytesDownloaded);
-            }
-            catch
-            {
-                DeleteFileIfExists(tempFilePath);
-                throw;
-            }
-        }
-
-        public bool VerifyFileHash(string filePath, string sha512Hash)
-        {
-            if (string.IsNullOrWhiteSpace(filePath))
-            {
-                throw new ArgumentException("File path cannot be null, empty, or whitespace.", nameof(filePath));
-            }
-
-            if (string.IsNullOrWhiteSpace(sha512Hash))
-            {
-                throw new ArgumentException("SHA-512 hash cannot be null, empty, or whitespace.", nameof(sha512Hash));
-            }
-
-            if (!File.Exists(filePath))
-            {
-                return false;
-            }
-
-            string normalizedExpectedHash = NormalizeHash(sha512Hash);
-
-            using FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);
-            using SHA512 sha512 = SHA512.Create();
-
-            byte[] hashBytes = sha512.ComputeHash(fileStream);
-            string actualHash = ConvertToLowerHex(hashBytes);
-
-            return string.Equals(actualHash, normalizedExpectedHash, StringComparison.OrdinalIgnoreCase);
-        }
-
-        private static void EnsureDestinationDirectoryExists(string destinationPath)
-        {
-            string? directoryPath = Path.GetDirectoryName(destinationPath);
-            if (!string.IsNullOrWhiteSpace(directoryPath))
-            {
-                Directory.CreateDirectory(directoryPath);
-            }
-        }
-
-        private static void ReplaceDestinationFile(string sourcePath, string destinationPath)
-        {
-            DeleteFileIfExists(destinationPath);
-            File.Move(sourcePath, destinationPath);
-        }
-
-        private static void DeleteFileIfExists(string path)
-        {
-            if (File.Exists(path))
-            {
-                File.Delete(path);
-            }
-        }
-
-        private static string NormalizeHash(string hash)
-        {
-            return hash.Trim().Replace("-", string.Empty).ToLowerInvariant();
-        }
-
-        private static string ConvertToLowerHex(byte[]? hashBytes)
-        {
-            if (hashBytes == null || hashBytes.Length == 0)
-            {
-                throw new InvalidOperationException("Hash computation returned no data.");
-            }
-
-            return BitConverter.ToString(hashBytes).Replace("-", string.Empty).ToLowerInvariant();
-        }
-    }
-}

AlayaCore/Services/GameInstallService.cs

@@ -0,0 +1,372 @@
+using System;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+using AlayaCore.Abstractions.Interfaces;
+using AlayaCore.Abstractions.Interfaces.Services;
+using AlayaCore.Installation;
+using AlayaCore.Models;
+using AlayaCore.Models.Manifests;
+using AlayaCore.Utilities.Enums;
+using CmlLib.Core;
+using CmlLib.Core.Installer.NeoForge;
+using CmlLib.Core.Installer.NeoForge.Installers;
+using CmlLib.Core.Installers;
+using Microsoft.Extensions.Logging;
+
+namespace AlayaCore.Services
+{
+    public sealed class GameInstallService : IGameInstallService
+    {
+        private const string INSTALLED_MODS_MANIFEST_FILE_NAME = "InstalledModsManifest.json";
+
+        private readonly IFileStore _fileStore;
+        private readonly ISettingsService _settingsService;
+        private readonly ILogger<GameInstallService> _logger;
+
+        private AlayaPath? _gamePath;
+        private MinecraftLauncher? _minecraftLauncher;
+
+        public GameInstallService(
+            IFileStore fileStore,
+            ISettingsService settingsService,
+            ILogger<GameInstallService> logger)
+        {
+            _fileStore = fileStore ?? throw new ArgumentNullException(nameof(fileStore));
+            _settingsService = settingsService ?? throw new ArgumentNullException(nameof(settingsService));
+            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        }
+
+        public async Task EnsureMinecraftInstalledAsync(
+            ManifestModel manifest,
+            InstallEnvironment environment,
+            CancellationToken cancellationToken = default,
+            EventHandler<InstallerProgressChangedEventArgs>? minecraftProgress = null,
+            EventHandler<ByteProgress>? byteProgress = null)
+        {
+            if (manifest == null)
+            {
+                throw new ArgumentNullException(nameof(manifest));
+            }
+
+            if (environment == null)
+            {
+                throw new ArgumentNullException(nameof(environment));
+            }
+
+            cancellationToken.ThrowIfCancellationRequested();
+
+            if (string.IsNullOrWhiteSpace(manifest.MinecraftVersion))
+            {
+                _logger.LogError("Minecraft installation could not start because the manifest did not contain a Minecraft version.");
+                throw new InvalidDataException("Minecraft version is missing.");
+            }
+
+            _logger.LogInformation(
+                "Ensuring Minecraft is installed. Required version: {RequiredVersion}, Installed: {Installed}, Current version: {CurrentVersion}",
+                manifest.MinecraftVersion,
+                environment.MinecraftInstalled,
+                environment.MinecraftVersion);
+
+            bool alreadyInstalled =
+                environment.MinecraftInstalled &&
+                string.Equals(environment.MinecraftVersion, manifest.MinecraftVersion, StringComparison.OrdinalIgnoreCase);
+
+            if (alreadyInstalled)
+            {
+                _logger.LogInformation("Minecraft version {MinecraftVersion} is already installed and matches the manifest.", manifest.MinecraftVersion);
+                return;
+            }
+
+            bool versionMismatch =
+                environment.MinecraftInstalled &&
+                !string.Equals(environment.MinecraftVersion, manifest.MinecraftVersion, StringComparison.OrdinalIgnoreCase);
+
+            if (versionMismatch)
+            {
+                _logger.LogWarning(
+                    "Minecraft version mismatch detected. Installed version: {InstalledVersion}, Required version: {RequiredVersion}. Cleaning old install.",
+                    environment.MinecraftVersion,
+                    manifest.MinecraftVersion);
+
+                await CleanOldInstallAsync(cancellationToken).ConfigureAwait(false);
+            }
+
+            MinecraftLauncher launcher = GetOrCreateLauncher(minecraftProgress, byteProgress);
+
+            _logger.LogInformation("Starting Minecraft installation for version {MinecraftVersion}.", manifest.MinecraftVersion);
+
+            await launcher
+                .InstallAsync(manifest.MinecraftVersion, cancellationToken)
+                .ConfigureAwait(false);
+
+            _logger.LogInformation("Minecraft installation completed for version {MinecraftVersion}.", manifest.MinecraftVersion);
+        }
+
+        public async Task EnsureNeoForgeInstalledAsync(
+            ManifestModel manifest,
+            InstallEnvironment environment,
+            CancellationToken cancellationToken = default,
+            IProgress<InstallerProgressChangedEventArgs>? progress = null,
+            IProgress<ByteProgress>? byteProgress = null)
+        {
+            if (manifest == null)
+            {
+                throw new ArgumentNullException(nameof(manifest));
+            }
+
+            if (environment == null)
+            {
+                throw new ArgumentNullException(nameof(environment));
+            }
+
+            cancellationToken.ThrowIfCancellationRequested();
+
+            if (string.IsNullOrWhiteSpace(manifest.MinecraftVersion))
+            {
+                _logger.LogError("NeoForge installation could not start because the manifest did not contain a Minecraft version.");
+                throw new InvalidDataException("Minecraft version is missing.");
+            }
+
+            if (string.IsNullOrWhiteSpace(manifest.NeoforgedVersion))
+            {
+                _logger.LogError("NeoForge installation could not start because the manifest did not contain a NeoForge version.");
+                throw new InvalidDataException("NeoForge version is missing.");
+            }
+
+            _logger.LogInformation(
+                "Ensuring NeoForge is installed. Required version: {RequiredVersion}, Installed: {Installed}, Current version: {CurrentVersion}",
+                manifest.NeoforgedVersion,
+                environment.NeoforgedInstalled,
+                environment.NeoforgedVersion);
+
+            bool alreadyInstalled =
+                environment.NeoforgedInstalled &&
+                string.Equals(environment.NeoforgedVersion, manifest.NeoforgedVersion, StringComparison.OrdinalIgnoreCase);
+
+            if (alreadyInstalled)
+            {
+                _logger.LogInformation("NeoForge version {NeoForgeVersion} is already installed and matches the manifest.", manifest.NeoforgedVersion);
+                return;
+            }
+
+            bool neoForgeMismatch =
+                environment.NeoforgedInstalled &&
+                !string.Equals(environment.NeoforgedVersion, manifest.NeoforgedVersion, StringComparison.OrdinalIgnoreCase);
+
+            if (neoForgeMismatch)
+            {
+                _logger.LogWarning(
+                    "NeoForge version mismatch detected. Installed version: {InstalledVersion}, Required version: {RequiredVersion}. Cleaning old install and returning control to the director.",
+                    environment.NeoforgedVersion,
+                    manifest.NeoforgedVersion);
+
+                await CleanOldInstallAsync(cancellationToken).ConfigureAwait(false);
+                return;
+            }
+
+            if (!environment.MinecraftInstalled ||
+                !string.Equals(environment.MinecraftVersion, manifest.MinecraftVersion, StringComparison.OrdinalIgnoreCase))
+            {
+                _logger.LogInformation(
+                    "Minecraft base installation is missing or mismatched before NeoForge installation. Ensuring Minecraft version {MinecraftVersion} first.",
+                    manifest.MinecraftVersion);
+
+                await EnsureMinecraftInstalledAsync(manifest, environment, cancellationToken).ConfigureAwait(false);
+            }
+
+            if (string.IsNullOrWhiteSpace(environment.JavaPath))
+            {
+                _logger.LogError("NeoForge installation cannot continue because no valid Java path was found.");
+                throw new InvalidOperationException("A valid Java installation is required before installing NeoForge.");
+            }
+
+            MinecraftLauncher launcher = GetOrCreateLauncher();
+
+            _logger.LogInformation(
+                "Starting NeoForge installation. Minecraft version: {MinecraftVersion}, NeoForge version: {NeoForgeVersion}, Java path: {JavaPath}",
+                manifest.MinecraftVersion,
+                manifest.NeoforgedVersion,
+                environment.JavaPath);
+
+            await InstallNeoForgeAsync(
+                launcher,
+                manifest,
+                environment,
+                cancellationToken,
+                progress,
+                byteProgress).ConfigureAwait(false);
+
+            _logger.LogInformation(
+                "NeoForge installation completed. Verifying Minecraft files for version {MinecraftVersion}.",
+                manifest.MinecraftVersion);
+
+            await launcher
+                .InstallAsync(manifest.MinecraftVersion, cancellationToken)
+                .ConfigureAwait(false);
+
+            _logger.LogInformation("Minecraft file verification completed after NeoForge installation.");
+        }
+
+        public async Task VerifyFilesAsync(
+            ManifestModel manifest,
+            CancellationToken cancellationToken = default)
+        {
+            if (manifest == null)
+            {
+                throw new ArgumentNullException(nameof(manifest));
+            }
+
+            cancellationToken.ThrowIfCancellationRequested();
+
+            if (string.IsNullOrWhiteSpace(manifest.MinecraftVersion))
+            {
+                _logger.LogError("File verification could not start because the manifest did not contain a Minecraft version.");
+                throw new InvalidDataException("Minecraft version is missing.");
+            }
+
+            MinecraftLauncher launcher = GetOrCreateLauncher();
+
+            _logger.LogInformation("Verifying Minecraft files for version {MinecraftVersion}.", manifest.MinecraftVersion);
+
+            await launcher
+                .InstallAsync(manifest.MinecraftVersion, cancellationToken)
+                .ConfigureAwait(false);
+
+            _logger.LogInformation("Minecraft file verification completed for version {MinecraftVersion}.", manifest.MinecraftVersion);
+        }
+
+        private async Task CleanOldInstallAsync(CancellationToken cancellationToken)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+
+            string gamePath = GetMinecraftPath();
+
+            _logger.LogInformation("Cleaning old game installation at path {GamePath}.", gamePath);
+
+            if (Directory.Exists(gamePath))
+            {
+                Directory.Delete(gamePath, recursive: true);
+                _logger.LogInformation("Deleted game directory {GamePath}.", gamePath);
+            }
+            else
+            {
+                _logger.LogDebug("Game directory {GamePath} did not exist. No game files needed deletion.", gamePath);
+            }
+
+            string installedModsManifestPath = Path.Combine(
+                _fileStore.Get(FolderLocation.Manifests),
+                INSTALLED_MODS_MANIFEST_FILE_NAME);
+
+            if (File.Exists(installedModsManifestPath))
+            {
+                File.Delete(installedModsManifestPath);
+                _logger.LogInformation("Deleted installed mods manifest at {InstalledModsManifestPath}.", installedModsManifestPath);
+            }
+            else
+            {
+                _logger.LogDebug("Installed mods manifest {InstalledModsManifestPath} did not exist.", installedModsManifestPath);
+            }
+
+            _gamePath = null;
+            _minecraftLauncher = null;
+
+            _logger.LogDebug("Cleared cached Minecraft launcher state.");
+
+            await _settingsService
+                .UpdateLaunchVersionAsync(string.Empty, cancellationToken)
+                .ConfigureAwait(false);
+
+            _logger.LogInformation("Cleared stored launch version after cleaning the old install.");
+        }
+
+        private MinecraftLauncher GetOrCreateLauncher(
+            EventHandler<InstallerProgressChangedEventArgs>? minecraftProgress = null,
+            EventHandler<ByteProgress>? byteProgress = null)
+        {
+            if (_minecraftLauncher != null)
+            {
+                _logger.LogDebug("Reusing existing MinecraftLauncher instance.");
+                return _minecraftLauncher;
+            }
+
+            _logger.LogInformation("Creating a new MinecraftLauncher instance.");
+
+            _gamePath = new AlayaPath(_fileStore);
+            _minecraftLauncher = new MinecraftLauncher(_gamePath);
+
+            if (byteProgress != null)
+            {
+                _minecraftLauncher.ByteProgressChanged += byteProgress;
+                _logger.LogDebug("Attached Minecraft byte progress handler.");
+            }
+
+            if (minecraftProgress != null)
+            {
+                _minecraftLauncher.FileProgressChanged += minecraftProgress;
+                _logger.LogDebug("Attached Minecraft file progress handler.");
+            }
+
+            return _minecraftLauncher;
+        }
+
+        private async Task InstallNeoForgeAsync(
+            MinecraftLauncher launcher,
+            ManifestModel manifest,
+            InstallEnvironment environment,
+            CancellationToken cancellationToken,
+            IProgress<InstallerProgressChangedEventArgs>? progress = null,
+            IProgress<ByteProgress>? byteProgress = null)
+        {
+            if (launcher == null)
+            {
+                throw new ArgumentNullException(nameof(launcher));
+            }
+
+            _logger.LogDebug(
+                "Configuring NeoForge installer. Minecraft version: {MinecraftVersion}, NeoForge version: {NeoForgeVersion}",
+                manifest.MinecraftVersion,
+                manifest.NeoforgedVersion);
+
+            NeoForgeInstaller installer = new NeoForgeInstaller(launcher);
+
+            NeoForgeInstallOptions options = new NeoForgeInstallOptions
+            {
+                CancellationToken = cancellationToken,
+                JavaPath = environment.JavaPath,
+                SkipIfAlreadyInstalled = true
+            };
+
+            if (progress != null)
+            {
+                options.FileProgress = progress;
+                _logger.LogDebug("Attached NeoForge file progress reporter.");
+            }
+
+            if (byteProgress != null)
+            {
+                options.ByteProgress = byteProgress;
+                _logger.LogDebug("Attached NeoForge byte progress reporter.");
+            }
+
+            string version = await installer
+                .Install(manifest.MinecraftVersion, manifest.NeoforgedVersion, options)
+                .ConfigureAwait(false);
+
+            _logger.LogInformation("NeoForge installer returned launch version {LaunchVersion}.", version);
+
+            await _settingsService
+                .UpdateLaunchVersionAsync(version, cancellationToken)
+                .ConfigureAwait(false);
+
+            _logger.LogInformation("Persisted launch version {LaunchVersion} to settings.", version);
+        }
+
+        private string GetMinecraftPath()
+        {
+            string gamePath = _fileStore.GetOrCreate(FolderLocation.Game);
+            _logger.LogDebug("Resolved Minecraft game path to {GamePath}.", gamePath);
+            return gamePath;
+        }
+    }
+}

AlayaCore/Services/GameLaunchService.cs

@@ -0,0 +1,176 @@
+using System;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+using AlayaCore.Abstractions.Interfaces;
+using AlayaCore.Abstractions.Interfaces.Services;
+using AlayaCore.Installation;
+using AlayaCore.Models;
+using AlayaCore.Models.Configuration;
+using AlayaCore.Models.Manifests;
+using CmlLib.Core;
+using CmlLib.Core.ProcessBuilder;
+using Microsoft.Extensions.Logging;
+
+namespace AlayaCore.Services
+{
+    public sealed class GameLaunchService : IGameLaunchService
+    {
+        private readonly IAuthService _authService;
+        private readonly IFileStore _fileStore;
+        private readonly ILaunchDirector _director;
+        private readonly GameOptions _gameOptions;
+        private readonly ILogger<GameLaunchService> _logger;
+
+        private MinecraftLauncher? _minecraftLauncher;
+
+        public GameLaunchService(
+            IAuthService authService,
+            IFileStore fileStore,
+            ILaunchDirector director,
+            GameOptions gameOptions,
+            ILogger<GameLaunchService> logger)
+        {
+            _authService = authService ?? throw new ArgumentNullException(nameof(authService));
+            _fileStore = fileStore ?? throw new ArgumentNullException(nameof(fileStore));
+            _director = director ?? throw new ArgumentNullException(nameof(director));
+            _gameOptions = gameOptions ?? throw new ArgumentNullException(nameof(gameOptions));
+            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        }
+
+        public async Task LaunchAsync(
+            ManifestModel manifest,
+            InstallEnvironment environment,
+            CancellationToken cancellationToken = default)
+        {
+            if (!_director.CanRun)
+            {
+                _logger.LogError("Game launch was requested while the launcher was not in a runnable state.");
+                throw new InvalidOperationException("The launcher is not in a runnable state.");
+            }
+
+            if (manifest == null)
+            {
+                throw new ArgumentNullException(nameof(manifest));
+            }
+
+            if (environment == null)
+            {
+                throw new ArgumentNullException(nameof(environment));
+            }
+
+            if (string.IsNullOrWhiteSpace(_gameOptions.LaunchVersion))
+            {
+                _logger.LogError("Game launch could not start because GameOptions.LaunchVersion is not configured.");
+                throw new InvalidDataException("GameOptions.LaunchVersion is not configured.");
+            }
+
+            if (string.IsNullOrWhiteSpace(environment.JavaPath))
+            {
+                _logger.LogError("Game launch could not start because no valid Java path was available.");
+                throw new InvalidOperationException("A valid Java path is required to launch the game.");
+            }
+
+            cancellationToken.ThrowIfCancellationRequested();
+
+            _logger.LogInformation(
+                "Starting game launch. LaunchVersion: {LaunchVersion}, JavaPath: {JavaPath}, Resolution: {Width}x{Height}, MinRamMb: {MinRamMb}, MaxRamMb: {MaxRamMb}",
+                _gameOptions.LaunchVersion,
+                environment.JavaPath,
+                _gameOptions.ScreenWidth,
+                _gameOptions.ScreenHeight,
+                _gameOptions.MinimumRamMb,
+                _gameOptions.MaximumRamMb);
+
+            MLaunchOption option = await BuildLaunchOptionsAsync(
+                manifest,
+                environment,
+                cancellationToken).ConfigureAwait(false);
+
+            MinecraftLauncher launcher = GetOrCreateLauncher();
+
+            _logger.LogInformation("Creating Minecraft process for launch version {LaunchVersion}.", _gameOptions.LaunchVersion);
+
+            var process = await launcher
+                .CreateProcessAsync(_gameOptions.LaunchVersion, option)
+                .ConfigureAwait(false);
+
+            _logger.LogInformation(
+                "Minecraft process was created successfully. ProcessId: {ProcessId}",
+                process.Id);
+
+            var processWrapper = new ProcessWrapper(process);
+
+            _logger.LogInformation("Starting Minecraft process.");
+            processWrapper.StartWithEvents();
+
+            _logger.LogInformation("Waiting for Minecraft process to exit.");
+            await processWrapper.WaitForExitTaskAsync().ConfigureAwait(false);
+
+            _logger.LogInformation(
+                "Minecraft process exited. ProcessId: {ProcessId}, ExitCode: {ExitCode}",
+                process.Id,
+                process.ExitCode);
+        }
+
+        private MinecraftLauncher GetOrCreateLauncher()
+        {
+            if (_minecraftLauncher != null)
+            {
+                _logger.LogDebug("Reusing existing MinecraftLauncher instance for game launch.");
+                return _minecraftLauncher;
+            }
+
+            _logger.LogInformation("Creating a new MinecraftLauncher instance for game launch.");
+            _minecraftLauncher = new MinecraftLauncher(new AlayaPath(_fileStore));
+            return _minecraftLauncher;
+        }
+
+        private async Task<MLaunchOption> BuildLaunchOptionsAsync(
+            ManifestModel manifest,
+            InstallEnvironment environment,
+            CancellationToken cancellationToken)
+        {
+            if (manifest == null)
+            {
+                throw new ArgumentNullException(nameof(manifest));
+            }
+
+            if (environment == null)
+            {
+                throw new ArgumentNullException(nameof(environment));
+            }
+
+            if (manifest.ServerUrl == null)
+            {
+                _logger.LogError("Launch options could not be built because Manifest.ServerUrl is not configured.");
+                throw new InvalidDataException("Manifest ServerUrl is not configured.");
+            }
+
+            _logger.LogDebug(
+                "Building launch options. ServerHost: {ServerHost}, ServerPort: {ServerPort}, LaunchVersion: {LaunchVersion}",
+                manifest.ServerUrl.Host,
+                manifest.ServerPort,
+                _gameOptions.LaunchVersion);
+
+            var session = await _authService
+                .GetSessionAsync(cancellationToken)
+                .ConfigureAwait(false);
+
+            _logger.LogDebug("A valid Minecraft session was acquired for launch.");
+
+            return new MLaunchOption
+            {
+                Session = session,
+                JavaPath = environment.JavaPath,
+                MinimumRamMb = _gameOptions.MinimumRamMb,
+                MaximumRamMb = _gameOptions.MaximumRamMb,
+                ScreenWidth = _gameOptions.ScreenWidth,
+                ScreenHeight = _gameOptions.ScreenHeight,
+                ServerIp = manifest.ServerUrl.Host,
+                ServerPort = manifest.ServerPort,
+                DockName = "AlayaCraft"
+            };
+        }
+    }
+}

AlayaCore/Services/HttpDownloadService.cs

@@ -0,0 +1,381 @@
+using System;
+using System.Diagnostics;
+using System.IO;
+using System.Net.Http;
+using System.Security.Cryptography;
+using System.Threading;
+using System.Threading.Tasks;
+using AlayaCore.Abstractions.Interfaces.Clients;
+using AlayaCore.Abstractions.Interfaces.Policies;
+using AlayaCore.Abstractions.Interfaces.Services;
+using AlayaCore.Models.Progress;
+using AlayaCore.Models.Results;
+using Microsoft.Extensions.Logging;
+
+namespace AlayaCore.Services
+{
+    public sealed class HttpDownloadService : IDownloadService
+    {
+        private const int BUFFER_SIZE = 81920;
+
+        private readonly IHttpClient _httpClient;
+        private readonly IRetryPolicy _retryPolicy;
+        private readonly ILogger<HttpDownloadService> _logger;
+
+        public HttpDownloadService(
+            IHttpClient httpClient,
+            IRetryPolicy retryPolicy,
+            ILogger<HttpDownloadService> logger)
+        {
+            _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
+            _retryPolicy = retryPolicy ?? throw new ArgumentNullException(nameof(retryPolicy));
+            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        }
+
+        public async Task<DownloadResult> DownloadFileAsync(
+            Uri sourceUri,
+            string destinationPath,
+            string sha512Hash,
+            IProgress<DownloadProgress>? progress = null,
+            CancellationToken cancellationToken = default)
+        {
+            if (sourceUri == null)
+            {
+                throw new ArgumentNullException(nameof(sourceUri));
+            }
+
+            if (!sourceUri.IsAbsoluteUri)
+            {
+                throw new ArgumentException("Source URI must be absolute.", nameof(sourceUri));
+            }
+
+            if (string.IsNullOrWhiteSpace(destinationPath))
+            {
+                throw new ArgumentException("Destination path cannot be null, empty, or whitespace.", nameof(destinationPath));
+            }
+
+            string normalizedExpectedHash = NormalizeHash(sha512Hash);
+            cancellationToken.ThrowIfCancellationRequested();
+
+            string fileName = Path.GetFileName(destinationPath);
+            if (string.IsNullOrWhiteSpace(fileName))
+            {
+                throw new ArgumentException("Destination path must include a file name.", nameof(destinationPath));
+            }
+
+            _logger.LogInformation(
+                "Starting download workflow for {FileName} from {SourceUri} to {DestinationPath}.",
+                fileName,
+                sourceUri,
+                destinationPath);
+
+            EnsureDestinationDirectoryExists(destinationPath);
+
+            if (File.Exists(destinationPath) && VerifyFileHash(destinationPath, normalizedExpectedHash))
+            {
+                long existingLength = new FileInfo(destinationPath).Length;
+
+                _logger.LogInformation(
+                    "Skipped download for {FileName} because the destination file already exists and passed SHA-512 verification.",
+                    fileName);
+
+                progress?.Report(new DownloadProgress(
+                    fileName: fileName,
+                    destinationPath: destinationPath,
+                    bytesDownloaded: 0,
+                    totalBytes: existingLength,
+                    bytesPerSecond: null,
+                    statusMessage: "File already present and valid."));
+
+                return new DownloadResult(
+                    destinationPath,
+                    DownloadOutcome.SkippedAlreadyValid,
+                    hashVerified: true,
+                    bytesDownloaded: 0);
+            }
+
+            bool destinationExisted = File.Exists(destinationPath);
+            string tempFilePath = destinationPath + ".download";
+
+            if (destinationExisted)
+            {
+                _logger.LogInformation(
+                    "Destination file for {FileName} already existed but was not valid. A replacement download will be attempted.",
+                    fileName);
+            }
+
+            DeleteFileIfExists(tempFilePath);
+
+            try
+            {
+                DownloadResult result = await _retryPolicy.ExecuteAsync(
+                    async token =>
+                    {
+                        DeleteFileIfExists(tempFilePath);
+
+                        using HttpResponseMessage response = await _httpClient.GetAsync(
+                            sourceUri,
+                            HttpCompletionOption.ResponseHeadersRead,
+                            token).ConfigureAwait(false);
+
+                        response.EnsureSuccessStatusCode();
+
+                        long? totalBytes = response.Content.Headers.ContentLength;
+                        long bytesDownloaded = 0;
+
+                        _logger.LogInformation(
+                            "Download response received for {FileName}. Content-Length: {TotalBytes}.",
+                            fileName,
+                            totalBytes);
+
+                        progress?.Report(new DownloadProgress(
+                            fileName: fileName,
+                            destinationPath: destinationPath,
+                            bytesDownloaded: 0,
+                            totalBytes: totalBytes,
+                            bytesPerSecond: null,
+                            statusMessage: "Starting download..."));
+
+                        await using Stream responseStream = await response.Content
+                            .ReadAsStreamAsync()
+                            .ConfigureAwait(false);
+
+                        await using FileStream fileStream = new FileStream(
+                            tempFilePath,
+                            FileMode.Create,
+                            FileAccess.Write,
+                            FileShare.None,
+                            BUFFER_SIZE,
+                            useAsync: true);
+
+                        using SHA512 sha512 = SHA512.Create();
+
+                        byte[] buffer = new byte[BUFFER_SIZE];
+                        Stopwatch stopwatch = Stopwatch.StartNew();
+
+                        _logger.LogDebug(
+                            "Streaming download content for {FileName} into temporary file {TempFilePath}.",
+                            fileName,
+                            tempFilePath);
+
+                        while (true)
+                        {
+                            int bytesRead = await responseStream.ReadAsync(
+                                buffer,
+                                0,
+                                buffer.Length,
+                                token).ConfigureAwait(false);
+
+                            if (bytesRead == 0)
+                            {
+                                break;
+                            }
+
+                            await fileStream.WriteAsync(
+                                buffer,
+                                0,
+                                bytesRead,
+                                token).ConfigureAwait(false);
+
+                            sha512.TransformBlock(buffer, 0, bytesRead, null, 0);
+
+                            bytesDownloaded += bytesRead;
+
+                            double? bytesPerSecond = null;
+                            if (stopwatch.Elapsed.TotalSeconds > 0d)
+                            {
+                                bytesPerSecond = bytesDownloaded / stopwatch.Elapsed.TotalSeconds;
+                            }
+
+                            progress?.Report(new DownloadProgress(
+                                fileName: fileName,
+                                destinationPath: destinationPath,
+                                bytesDownloaded: bytesDownloaded,
+                                totalBytes: totalBytes,
+                                bytesPerSecond: bytesPerSecond,
+                                statusMessage: "Downloading file..."));
+                        }
+
+                        sha512.TransformFinalBlock(Array.Empty<byte>(), 0, 0);
+                        await fileStream.FlushAsync(token).ConfigureAwait(false);
+
+                        string actualHash = ConvertToLowerHex(sha512.Hash);
+                        if (!string.Equals(actualHash, normalizedExpectedHash, StringComparison.OrdinalIgnoreCase))
+                        {
+                            _logger.LogError(
+                                "Hash verification failed for downloaded file {FileName}. Expected SHA-512: {ExpectedHash}. Actual SHA-512: {ActualHash}.",
+                                fileName,
+                                normalizedExpectedHash,
+                                actualHash);
+
+                            throw new InvalidDataException(
+                                $"Downloaded file hash mismatch. Expected '{normalizedExpectedHash}', got '{actualHash}'.");
+                        }
+
+                        _logger.LogInformation(
+                            "Hash verification succeeded for {FileName}. Replacing destination file with downloaded content.",
+                            fileName);
+
+                        ReplaceDestinationFile(tempFilePath, destinationPath);
+
+                        double? finalBytesPerSecond = null;
+                        if (stopwatch.Elapsed.TotalSeconds > 0d)
+                        {
+                            finalBytesPerSecond = bytesDownloaded / stopwatch.Elapsed.TotalSeconds;
+                        }
+
+                        progress?.Report(new DownloadProgress(
+                            fileName: fileName,
+                            destinationPath: destinationPath,
+                            bytesDownloaded: bytesDownloaded,
+                            totalBytes: totalBytes ?? bytesDownloaded,
+                            bytesPerSecond: finalBytesPerSecond,
+                            statusMessage: "Download complete."));
+
+                        DownloadOutcome outcome = destinationExisted
+                            ? DownloadOutcome.ReplacedInvalid
+                            : DownloadOutcome.Downloaded;
+
+                        _logger.LogInformation(
+                            "Download completed successfully for {FileName}. Outcome: {Outcome}. Bytes downloaded: {BytesDownloaded}.",
+                            fileName,
+                            outcome,
+                            bytesDownloaded);
+
+                        return new DownloadResult(
+                            destinationPath,
+                            outcome,
+                            hashVerified: true,
+                            bytesDownloaded: bytesDownloaded);
+                    },
+                    $"download:{fileName}",
+                    cancellationToken).ConfigureAwait(false);
+
+                return result;
+            }
+            catch (OperationCanceledException)
+            {
+                _logger.LogWarning(
+                    "Download for {FileName} was cancelled. Cleaning up temporary file {TempFilePath}.",
+                    fileName,
+                    tempFilePath);
+
+                DeleteFileIfExists(tempFilePath);
+                throw;
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(
+                    ex,
+                    "Download failed for {FileName}. Cleaning up temporary file {TempFilePath}.",
+                    fileName,
+                    tempFilePath);
+
+                DeleteFileIfExists(tempFilePath);
+                throw;
+            }
+        }
+
+        public bool VerifyFileHash(string filePath, string sha512Hash)
+        {
+            if (string.IsNullOrWhiteSpace(filePath))
+            {
+                throw new ArgumentException("File path cannot be null, empty, or whitespace.", nameof(filePath));
+            }
+
+            string normalizedExpectedHash = NormalizeHash(sha512Hash);
+
+            if (!File.Exists(filePath))
+            {
+                _logger.LogDebug("Hash verification skipped because file does not exist at {FilePath}.", filePath);
+                return false;
+            }
+
+            using FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);
+            using SHA512 sha512 = SHA512.Create();
+
+            byte[] hashBytes = sha512.ComputeHash(fileStream);
+            string actualHash = ConvertToLowerHex(hashBytes);
+
+            bool matches = string.Equals(actualHash, normalizedExpectedHash, StringComparison.OrdinalIgnoreCase);
+
+            if (matches)
+            {
+                _logger.LogDebug("SHA-512 verification succeeded for {FilePath}.", filePath);
+            }
+            else
+            {
+                _logger.LogWarning(
+                    "SHA-512 verification failed for {FilePath}. Expected SHA-512: {ExpectedHash}. Actual SHA-512: {ActualHash}.",
+                    filePath,
+                    normalizedExpectedHash,
+                    actualHash);
+            }
+
+            return matches;
+        }
+
+        private static void EnsureDestinationDirectoryExists(string destinationPath)
+        {
+            string? directoryPath = Path.GetDirectoryName(destinationPath);
+
+            if (!string.IsNullOrWhiteSpace(directoryPath))
+            {
+                Directory.CreateDirectory(directoryPath);
+            }
+        }
+
+        private static void ReplaceDestinationFile(string sourcePath, string destinationPath)
+        {
+            DeleteFileIfExists(destinationPath);
+            File.Move(sourcePath, destinationPath);
+        }
+
+        private static void DeleteFileIfExists(string path)
+        {
+            if (File.Exists(path))
+            {
+                File.Delete(path);
+            }
+        }
+
+        private static string NormalizeHash(string hash)
+        {
+            if (string.IsNullOrWhiteSpace(hash))
+            {
+                throw new ArgumentException("SHA-512 hash cannot be null, empty, or whitespace.", nameof(hash));
+            }
+
+            string normalized = hash.Trim().Replace("-", string.Empty).ToLowerInvariant();
+
+            if (normalized.Length != 128)
+            {
+                throw new ArgumentException("SHA-512 hash must be 128 hexadecimal characters long.", nameof(hash));
+            }
+
+            foreach (char c in normalized)
+            {
+                bool isHex =
+                    (c >= '0' && c <= '9') ||
+                    (c >= 'a' && c <= 'f');
+
+                if (!isHex)
+                {
+                    throw new ArgumentException("SHA-512 hash contains invalid characters.", nameof(hash));
+                }
+            }
+
+            return normalized;
+        }
+
+        private static string ConvertToLowerHex(byte[]? hashBytes)
+        {
+            if (hashBytes == null || hashBytes.Length == 0)
+            {
+                throw new InvalidOperationException("Hash computation returned no data.");
+            }
+
+            return BitConverter.ToString(hashBytes).Replace("-", string.Empty).ToLowerInvariant();
+        }
+    }
+}

AlayaCore/Services/InstallStateService.cs

@@ -1,31 +1,45 @@
 using System;
 using System.Diagnostics;
 using System.IO;
+using System.Linq;
 using System.Runtime.InteropServices;
 using System.Text.RegularExpressions;
 using System.Threading;
 using System.Threading.Tasks;
+using AlayaCore.Abstractions.Interfaces;
 using AlayaCore.Abstractions.Interfaces.Services;
 using AlayaCore.Installation;
 using AlayaCore.Models.Manifests;
+using AlayaCore.Utilities.Enums;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json.Linq;
 
 namespace AlayaCore.Services
 {
     public sealed class InstallationStateService : IInstallStateService
     {
-        private const string JAVA_RUNTIME_FOLDER_NAME = "java-runtime-epsilon";
+        private const string VERSIONS_FOLDER_NAME = "versions";
 
+        private readonly IFileStore _fileStore;
         private readonly IManifestService _manifestService;
+        private readonly ILogger<InstallationStateService> _logger;
 
-        public InstallationStateService(IManifestService manifestService)
+        public InstallationStateService(
+            IFileStore fileStore,
+            IManifestService manifestService,
+            ILogger<InstallationStateService> logger)
         {
+            _fileStore = fileStore ?? throw new ArgumentNullException(nameof(fileStore));
             _manifestService = manifestService ?? throw new ArgumentNullException(nameof(manifestService));
+            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
         }
 
         public async Task<InstallEnvironment> GetCurrentEnvironmentAsync(CancellationToken cancellationToken = default)
         {
             cancellationToken.ThrowIfCancellationRequested();
 
+            _logger.LogDebug("Building current installation environment state.");
+
             OSPlatform platform = GetCurrentPlatform();
 
             bool javaInstalled = TryGetJavaPath(out string? javaPath);
@@ -33,30 +47,42 @@ namespace AlayaCore.Services
 
             if (javaInstalled)
             {
+                _logger.LogDebug("Java runtime was detected at {JavaPath}. Attempting to read Java version.", javaPath);
                 javaVersion = GetJavaVersion(javaPath!);
             }
+            else
+            {
+                _logger.LogInformation("No managed Java runtime was detected.");
+            }
 
-            bool minecraftInstalled = IsMinecraftInstalled();
+            InstalledVersionState versionState = GetInstalledVersionState();
-            string? minecraftVersion = null;
-            
-            bool neoforgeInstalled = IsNeoforgeInstalled();
-            string? neoforgeVersion = null;
-            
 
             InstalledModsManifestModel installedModsManifest =
-                await _manifestService.GetInstalledModsManifestAsync(cancellationToken).ConfigureAwait(false)
+                await _manifestService.GetInstalledModsManifestAsync(cancellationToken).ConfigureAwait(false);
-                ?? new InstalledModsManifestModel();
 
-            return new InstallEnvironment(
+            InstallEnvironment environment = new InstallEnvironment(
                 osPlatform: platform,
                 javaInstalled: javaInstalled,
                 javaPath: javaPath,
                 javaVersion: javaVersion,
-                minecraftInstalled: minecraftInstalled,
+                minecraftInstalled: !string.IsNullOrWhiteSpace(versionState.MinecraftVersion),
-                minecraftVersion:  minecraftVersion,
+                minecraftVersion: versionState.MinecraftVersion,
-                neoforgedInstalled: neoforgeInstalled,
+                neoforgedInstalled: !string.IsNullOrWhiteSpace(versionState.NeoForgeVersion),
-                neoforgedVersion: neoforgeVersion,
+                neoforgedVersion: versionState.NeoForgeVersion,
                 installedModsManifest: installedModsManifest);
+
+            _logger.LogInformation(
+                "Installation environment resolved. Platform: {Platform}, JavaInstalled: {JavaInstalled}, JavaVersion: {JavaVersion}, MinecraftInstalled: {MinecraftInstalled}, MinecraftVersion: {MinecraftVersion}, NeoForgeInstalled: {NeoForgeInstalled}, NeoForgeVersion: {NeoForgeVersion}, InstalledModsCount: {InstalledModsCount}",
+                platform,
+                environment.JavaInstalled,
+                environment.JavaVersion,
+                environment.MinecraftInstalled,
+                environment.MinecraftVersion,
+                environment.NeoforgedInstalled,
+                environment.NeoforgedVersion,
+                environment.InstalledModsManifest.Mods.Count);
+
+            return environment;
         }
 
         private static OSPlatform GetCurrentPlatform()
@@ -79,7 +105,7 @@ namespace AlayaCore.Services
             throw new PlatformNotSupportedException("The current operating system is not supported.");
         }
 
-        private static string? GetJavaVersion(string javaPath)
+        private string? GetJavaVersion(string javaPath)
         {
             if (string.IsNullOrWhiteSpace(javaPath))
             {
@@ -91,6 +117,8 @@ namespace AlayaCore.Services
                 throw new FileNotFoundException("Java executable was not found.", javaPath);
             }
 
+            _logger.LogDebug("Reading Java version from executable at {JavaPath}.", javaPath);
+
             using var process = new Process
             {
                 StartInfo = new ProcessStartInfo
@@ -111,10 +139,26 @@ namespace AlayaCore.Services
 
             if (process.ExitCode != 0 && string.IsNullOrWhiteSpace(standardError))
             {
+                _logger.LogWarning(
+                    "Java version check for {JavaPath} exited with code {ExitCode} and produced no version output.",
+                    javaPath,
+                    process.ExitCode);
+
                 return null;
             }
 
-            return ParseJavaVersion(standardError);
+            string? version = ParseJavaVersion(standardError);
+
+            if (string.IsNullOrWhiteSpace(version))
+            {
+                _logger.LogWarning("Java version output from {JavaPath} could not be parsed.", javaPath);
+            }
+            else
+            {
+                _logger.LogDebug("Parsed Java version {JavaVersion} from {JavaPath}.", version, javaPath);
+            }
+
+            return version;
         }
 
         private static string? ParseJavaVersion(string processOutput)
@@ -131,37 +175,188 @@ namespace AlayaCore.Services
                 : null;
         }
 
-        private static bool TryGetJavaPath(out string? javaPath)
+        private bool TryGetJavaPath(out string? javaPath)
         {
             string executableName = RuntimeInformation.IsOSPlatform(OSPlatform.Windows)
-                ? "java.exe"
+                ? "javaw.exe"
                 : "java";
 
-            string fullPath = Path.Combine(
+            string runtimePath = _fileStore.Get(FolderLocation.JavaRuntime);
-                AppContext.BaseDirectory,
+            string fullPath = Path.Combine(runtimePath, "bin", executableName);
-                "Java",
-                JAVA_RUNTIME_FOLDER_NAME,
-                "bin",
-                executableName);
 
             if (!File.Exists(fullPath))
             {
+                _logger.LogDebug("Managed Java executable was not found at {JavaPath}.", fullPath);
                 javaPath = null;
                 return false;
             }
 
+            _logger.LogDebug("Managed Java executable was found at {JavaPath}.", fullPath);
             javaPath = fullPath;
             return true;
         }
 
-        private static bool IsMinecraftInstalled()
+        private InstalledVersionState GetInstalledVersionState()
         {
-            return true;
+            string versionsPath = GetVersionsPath();
+
+            _logger.LogDebug("Inspecting installed version metadata under {VersionsPath}.", versionsPath);
+
+            if (!Directory.Exists(versionsPath))
+            {
+                _logger.LogInformation("Versions directory does not exist at {VersionsPath}. No Minecraft or NeoForge installation was detected.", versionsPath);
+                return InstalledVersionState.Empty();
+            }
+
+            string[] versionDirectories = Directory
+                .GetDirectories(versionsPath)
+                .OrderBy(path => path, StringComparer.OrdinalIgnoreCase)
+                .ToArray();
+
+            if (versionDirectories.Length == 0)
+            {
+                _logger.LogInformation("Versions directory at {VersionsPath} was empty.", versionsPath);
+                return InstalledVersionState.Empty();
+            }
+
+            string? minecraftVersion = null;
+            string? neoForgeVersion = null;
+
+            foreach (string versionDirectory in versionDirectories)
+            {
+                string? versionFolderName = Path.GetFileName(versionDirectory);
+
+                if (string.IsNullOrWhiteSpace(versionFolderName))
+                {
+                    _logger.LogDebug("Skipping version directory with an invalid folder name: {VersionDirectory}.", versionDirectory);
+                    continue;
+                }
+
+                string versionJsonPath = Path.Combine(versionDirectory, $"{versionFolderName}.json");
+
+                if (!File.Exists(versionJsonPath))
+                {
+                    _logger.LogDebug("Skipping version directory {VersionDirectory} because version metadata file {VersionJsonPath} was not found.", versionDirectory, versionJsonPath);
+                    continue;
+                }
+
+                if (!TryLoadJson(versionJsonPath, out JObject? versionJson))
+                {
+                    _logger.LogWarning("Skipping version metadata file {VersionJsonPath} because it could not be read or parsed.", versionJsonPath);
+                    continue;
+                }
+
+                string? id = versionJson.Value<string>("id");
+                string? inheritsFrom = versionJson.Value<string>("inheritsFrom");
+
+                if (string.IsNullOrWhiteSpace(id))
+                {
+                    _logger.LogDebug("Skipping version metadata file {VersionJsonPath} because it did not contain a valid id.", versionJsonPath);
+                    continue;
+                }
+
+                if (IsNeoForgeVersion(id, inheritsFrom))
+                {
+                    neoForgeVersion ??= id;
+
+                    if (string.IsNullOrWhiteSpace(minecraftVersion) && !string.IsNullOrWhiteSpace(inheritsFrom))
+                    {
+                        minecraftVersion = inheritsFrom;
+                    }
+
+                    _logger.LogDebug(
+                        "Detected NeoForge version metadata. Id: {NeoForgeVersion}, InheritsFrom: {MinecraftVersion}",
+                        id,
+                        inheritsFrom);
+
+                    continue;
+                }
+
+                minecraftVersion ??= id;
+
+                _logger.LogDebug("Detected Minecraft version metadata. Id: {MinecraftVersion}", id);
+            }
+
+            _logger.LogInformation(
+                "Installed version state resolved. MinecraftVersion: {MinecraftVersion}, NeoForgeVersion: {NeoForgeVersion}",
+                minecraftVersion,
+                neoForgeVersion);
+
+            return new InstalledVersionState(minecraftVersion, neoForgeVersion);
         }
 
-        private static bool IsNeoforgeInstalled()
+        private string GetVersionsPath()
         {
-            return true;
+            string versionsPath = Path.Combine(_fileStore.Get(FolderLocation.Game), VERSIONS_FOLDER_NAME);
+            _logger.LogDebug("Resolved versions path to {VersionsPath}.", versionsPath);
+            return versionsPath;
+        }
+
+        private static bool IsNeoForgeVersion(string? id, string? inheritsFrom)
+        {
+            return ContainsNeoForgeMarker(id) || ContainsNeoForgeMarker(inheritsFrom);
+        }
+
+        private static bool ContainsNeoForgeMarker(string? value)
+        {
+            if (string.IsNullOrWhiteSpace(value))
+            {
+                return false;
+            }
+
+            return value.Contains("neoforge", StringComparison.OrdinalIgnoreCase) ||
+                   value.Contains("neoforged", StringComparison.OrdinalIgnoreCase);
+        }
+
+        private bool TryLoadJson(string path, out JObject? jsonObject)
+        {
+            jsonObject = null;
+
+            if (string.IsNullOrWhiteSpace(path) || !File.Exists(path))
+            {
+                return false;
+            }
+
+            try
+            {
+                string json = File.ReadAllText(path);
+
+                if (string.IsNullOrWhiteSpace(json))
+                {
+                    _logger.LogWarning("JSON file at {Path} was empty.", path);
+                    return false;
+                }
+
+                jsonObject = JObject.Parse(json);
+                return true;
+            }
+            catch (Exception ex)
+            {
+                _logger.LogWarning(ex, "Failed to load or parse JSON file at {Path}.", path);
+                return false;
+            }
+        }
+
+        private sealed class InstalledVersionState
+        {
+            public string? MinecraftVersion { get; }
+            public string? NeoForgeVersion { get; }
+
+            public InstalledVersionState(string? minecraftVersion, string? neoForgeVersion)
+            {
+                MinecraftVersion = Normalize(minecraftVersion);
+                NeoForgeVersion = Normalize(neoForgeVersion);
+            }
+
+            public static InstalledVersionState Empty()
+            {
+                return new InstalledVersionState(null, null);
+            }
+
+            private static string? Normalize(string? value)
+            {
+                return string.IsNullOrWhiteSpace(value) ? null : value;
+            }
         }
     }
 }

AlayaCore/Services/JavaService.cs

@@ -1,187 +0,0 @@
-using System;
-using System.IO;
-using System.Threading;
-using System.Threading.Tasks;
-using AlayaCore.Abstractions.Interfaces.Services;
-using AlayaCore.Installation;
-using AlayaCore.Models.Manifests;
-
-namespace AlayaCore.Services
-{
-    public sealed class JavaService : IJavaService
-    {
-        private const string DOWNLOAD_FILE_NAME = "java-runtime.download";
-        private const string JAVA_INSTALL_FOLDER_NAME = "Java";
-        private const string JAVA_ARCHIVE_HASH_PLACEHOLDER = "REPLACE_WITH_MANIFEST_HASH_SUPPORT";
-
-        private readonly IDownloadService _downloadService;
-
-        public JavaService(IDownloadService downloadService)
-        {
-            _downloadService = downloadService ?? throw new ArgumentNullException(nameof(downloadService));
-        }
-
-        public async Task EnsureValidJavaInstalledAsync(
-            ManifestModel manifest,
-            InstallEnvironment environment,
-            CancellationToken cancellationToken = default)
-        {
-            if (manifest == null)
-            {
-                throw new ArgumentNullException(nameof(manifest));
-            }
-
-            if (environment == null)
-            {
-                throw new ArgumentNullException(nameof(environment));
-            }
-
-            cancellationToken.ThrowIfCancellationRequested();
-
-            if (environment.JavaInstalled &&
-                string.Equals(environment.JavaVersion, manifest.RequiredJavaVersion, StringComparison.OrdinalIgnoreCase))
-            {
-                return;
-            }
-
-            if (environment.JavaInstalled && !string.IsNullOrWhiteSpace(environment.JavaPath))
-            {
-                string javaRootFolder = ResolveJavaRootFolder(environment.JavaPath);
-                await RemoveJavaAsync(javaRootFolder, cancellationToken).ConfigureAwait(false);
-            }
-
-            string downloadPath = GetJavaDownloadPath();
-            string installDirectory = GetJavaInstallDirectory();
-
-            Directory.CreateDirectory(Path.GetDirectoryName(downloadPath) ?? AppContext.BaseDirectory);
-            Directory.CreateDirectory(installDirectory);
-
-            await DownloadJavaAsync(
-                manifest.RequiredJavaUrl,
-                downloadPath,
-                cancellationToken).ConfigureAwait(false);
-
-            await InstallJavaAsync(
-                downloadPath,
-                installDirectory,
-                cancellationToken).ConfigureAwait(false);
-        }
-
-        private static string GetJavaInstallDirectory()
-        {
-            return Path.Combine(AppContext.BaseDirectory, JAVA_INSTALL_FOLDER_NAME);
-        }
-
-        private static string GetJavaDownloadPath()
-        {
-            return Path.Combine(AppContext.BaseDirectory, "Temp", DOWNLOAD_FILE_NAME);
-        }
-
-        private static string ResolveJavaRootFolder(string javaExecutablePath)
-        {
-            if (string.IsNullOrWhiteSpace(javaExecutablePath))
-            {
-                throw new ArgumentException("Java executable path cannot be null, empty, or whitespace.", nameof(javaExecutablePath));
-            }
-
-            string? binFolder = Path.GetDirectoryName(javaExecutablePath);
-            if (string.IsNullOrWhiteSpace(binFolder))
-            {
-                throw new InvalidOperationException("Could not resolve the Java bin directory.");
-            }
-
-            string? javaRootFolder = Path.GetDirectoryName(binFolder);
-            if (string.IsNullOrWhiteSpace(javaRootFolder))
-            {
-                throw new InvalidOperationException("Could not resolve the Java installation directory.");
-            }
-
-            return javaRootFolder;
-        }
-
-        private static Task RemoveJavaAsync(
-            string oldJavaFolder,
-            CancellationToken cancellationToken = default)
-        {
-            if (string.IsNullOrWhiteSpace(oldJavaFolder))
-            {
-                throw new ArgumentException("Old Java folder cannot be null, empty, or whitespace.", nameof(oldJavaFolder));
-            }
-
-            cancellationToken.ThrowIfCancellationRequested();
-
-            if (Directory.Exists(oldJavaFolder))
-            {
-                Directory.Delete(oldJavaFolder, recursive: true);
-            }
-
-            return Task.CompletedTask;
-        }
-
-        private async Task DownloadJavaAsync(
-            Uri javaUri,
-            string destinationPath,
-            CancellationToken cancellationToken = default)
-        {
-            if (javaUri == null)
-            {
-                throw new ArgumentNullException(nameof(javaUri));
-            }
-
-            if (!javaUri.IsAbsoluteUri)
-            {
-                throw new ArgumentException("Java download URI must be absolute.", nameof(javaUri));
-            }
-
-            if (string.IsNullOrWhiteSpace(destinationPath))
-            {
-                throw new ArgumentException("Destination path cannot be null, empty, or whitespace.", nameof(destinationPath));
-            }
-
-            cancellationToken.ThrowIfCancellationRequested();
-
-            // Replace this when your manifest includes a Java archive/runtime hash.
-            await _downloadService.DownloadFileAsync(
-                javaUri,
-                destinationPath,
-                JAVA_ARCHIVE_HASH_PLACEHOLDER,
-                cancellationToken: cancellationToken).ConfigureAwait(false);
-        }
-
-        private static Task InstallJavaAsync(
-            string installerPath,
-            string installDirectory,
-            CancellationToken cancellationToken = default)
-        {
-            if (string.IsNullOrWhiteSpace(installerPath))
-            {
-                throw new ArgumentException("Installer path cannot be null, empty, or whitespace.", nameof(installerPath));
-            }
-
-            if (string.IsNullOrWhiteSpace(installDirectory))
-            {
-                throw new ArgumentException("Install directory cannot be null, empty, or whitespace.", nameof(installDirectory));
-            }
-
-            cancellationToken.ThrowIfCancellationRequested();
-
-            if (!File.Exists(installerPath))
-            {
-                throw new FileNotFoundException("Java installer or archive was not found.", installerPath);
-            }
-
-            Directory.CreateDirectory(installDirectory);
-
-            // TODO:
-            // Implement this based on the actual Java package format.
-            //
-            // Examples:
-            // - If the file is a .zip, extract it into installDirectory
-            // - If it is a .tar.gz, unpack it appropriately
-            // - If it is an installer executable, launch it silently
-            //
-            // For now this is intentionally left explicit rather than guessing the wrong install strategy.
-            throw new NotImplementedException("InstallJavaAsync must be implemented for the actual Java package format.");
-        }
-    }
-}

AlayaCore/Services/LauncherUpdateService.cs

@@ -6,6 +6,7 @@ using System.Threading.Tasks;
 using AlayaCore.Abstractions.Interfaces.Services;
 using AlayaCore.Models.Configuration;
 using AlayaCore.Models.Manifests;
+using Microsoft.Extensions.Logging;
 
 namespace AlayaCore.Services
 {
@@ -13,97 +14,171 @@ namespace AlayaCore.Services
     {
         private readonly IManifestService _manifestService;
         private readonly LauncherUpdateServiceOptions _options;
+        private readonly ILogger<LauncherUpdateService> _logger;
 
         public LauncherUpdateService(
             IManifestService manifestService,
-            LauncherUpdateServiceOptions options)
+            LauncherUpdateServiceOptions options,
+            ILogger<LauncherUpdateService> logger)
         {
             _manifestService = manifestService ?? throw new ArgumentNullException(nameof(manifestService));
             _options = options ?? throw new ArgumentNullException(nameof(options));
+            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
         }
 
         public async Task<bool> DoesLauncherNeedUpdating(CancellationToken cancellationToken = default)
         {
             if (_options.ForceUpdate)
             {
+                _logger.LogWarning("Launcher update check is being forced by configuration.");
                 return true;
             }
 
             cancellationToken.ThrowIfCancellationRequested();
 
+            _logger.LogDebug("Checking whether the launcher requires an update.");
+
             LauncherManifestModel? localManifest = await _manifestService
                 .GetLocalLauncherManifestAsync(cancellationToken)
                 .ConfigureAwait(false);
 
             if (localManifest == null)
             {
+                _logger.LogInformation("No local launcher manifest was found. The launcher will be treated as requiring an update.");
+                return true;
+            }
+
+            if (localManifest.Version == null)
+            {
+                _logger.LogWarning("Local launcher manifest did not contain a valid version. The launcher will be treated as requiring an update.");
                 return true;
             }
 
             if (string.IsNullOrWhiteSpace(localManifest.Sha512Hash))
             {
+                _logger.LogWarning("Local launcher manifest did not contain a valid SHA-512 hash. The launcher will be treated as requiring an update.");
                 return true;
             }
 
-            string remoteHash = await _manifestService
+            LauncherManifestModel remoteManifest = await _manifestService
-                .GetRemoteLauncherManifestHashAsync(cancellationToken)
+                .GetRemoteLauncherManifestAsync(cancellationToken)
                 .ConfigureAwait(false);
 
-            if (string.IsNullOrWhiteSpace(remoteHash))
+            if (remoteManifest == null)
             {
+                _logger.LogError("Remote launcher manifest could not be loaded.");
+                throw new InvalidOperationException("Remote launcher manifest could not be loaded.");
+            }
+
+            if (remoteManifest.Version == null)
+            {
+                _logger.LogError("Remote launcher manifest did not contain a valid version.");
+                throw new InvalidOperationException("Remote launcher manifest returned an invalid version.");
+            }
+
+            if (string.IsNullOrWhiteSpace(remoteManifest.Sha512Hash))
+            {
+                _logger.LogError("Remote launcher manifest did not contain a valid SHA-512 hash.");
                 throw new InvalidOperationException("Remote launcher manifest returned an invalid SHA-512 hash.");
             }
 
-            return !string.Equals(
+            bool versionMismatch = localManifest.Version != remoteManifest.Version;
+            bool hashMismatch = !string.Equals(
                 localManifest.Sha512Hash.Trim(),
-                remoteHash.Trim(),
+                remoteManifest.Sha512Hash.Trim(),
                 StringComparison.OrdinalIgnoreCase);
+
+            _logger.LogInformation(
+                "Launcher update check complete. LocalVersion: {LocalVersion}, RemoteVersion: {RemoteVersion}, VersionMismatch: {VersionMismatch}, HashMismatch: {HashMismatch}",
+                localManifest.Version,
+                remoteManifest.Version,
+                versionMismatch,
+                hashMismatch);
+
+            return versionMismatch || hashMismatch;
         }
 
-        public Task LaunchUpdaterAsync(LauncherManifestModel newManifest, CancellationToken cancellationToken = default)
+        public Task LaunchUpdaterAsync(
+            LauncherManifestModel newManifest,
+            CancellationToken cancellationToken = default)
         {
             cancellationToken.ThrowIfCancellationRequested();
 
+            if (newManifest == null)
+            {
+                throw new ArgumentNullException(nameof(newManifest));
+            }
+
+            if (newManifest.DownloadUri == null)
+            {
+                _logger.LogError("Updater launch failed because the launcher manifest did not contain a download URI.");
+                throw new InvalidOperationException("Launcher manifest does not contain a download URI.");
+            }
+
+            if (!newManifest.DownloadUri.IsAbsoluteUri)
+            {
+                _logger.LogError("Updater launch failed because the launcher download URI was not absolute. DownloadUri: {DownloadUri}", newManifest.DownloadUri);
+                throw new InvalidOperationException("Launcher download URI must be absolute.");
+            }
+
             string updaterPath = _options.AlayaUpdaterPath;
 
             if (string.IsNullOrWhiteSpace(updaterPath))
             {
+                _logger.LogError("Updater launch failed because the updater path was not configured.");
                 throw new InvalidOperationException("Updater path is not configured.");
             }
 
             if (!Path.IsPathFullyQualified(updaterPath))
             {
+                _logger.LogError("Updater launch failed because the updater path was not absolute. UpdaterPath: {UpdaterPath}", updaterPath);
                 throw new InvalidOperationException("Updater path must be absolute.");
             }
 
             if (!File.Exists(updaterPath))
             {
+                _logger.LogError("Updater launch failed because the updater executable was not found at {UpdaterPath}.", updaterPath);
                 throw new FileNotFoundException("Alaya updater program was not found.", updaterPath);
             }
 
             string workingDirectory = Path.GetDirectoryName(updaterPath)
                 ?? throw new InvalidOperationException("Updater working directory could not be resolved.");
 
+            string arguments = $"-url \"{newManifest.DownloadUri.AbsoluteUri}\"";
+
             var startInfo = new ProcessStartInfo
             {
                 FileName = updaterPath,
                 WorkingDirectory = workingDirectory,
-                Arguments = $@"-url {newManifest.DownloadUri}",
+                Arguments = arguments,
                 UseShellExecute = false,
                 CreateNoWindow = true
             };
 
+            _logger.LogInformation(
+                "Launching updater process. UpdaterPath: {UpdaterPath}, WorkingDirectory: {WorkingDirectory}, DownloadUri: {DownloadUri}",
+                updaterPath,
+                workingDirectory,
+                newManifest.DownloadUri.AbsoluteUri);
+
             try
             {
                 Process? process = Process.Start(startInfo);
 
                 if (process == null)
                 {
+                    _logger.LogError("Updater process start returned null for executable {UpdaterPath}.", updaterPath);
                     throw new InvalidOperationException("Failed to start updater process.");
                 }
+
+                _logger.LogInformation(
+                    "Updater process launched successfully. ProcessId: {ProcessId}, UpdaterPath: {UpdaterPath}",
+                    process.Id,
+                    updaterPath);
             }
-            catch (Exception ex) when (!(ex is OperationCanceledException))
+            catch (Exception ex) when (ex is not OperationCanceledException)
             {
+                _logger.LogError(ex, "Failed to launch updater process from {UpdaterPath}.", updaterPath);
                 throw new InvalidOperationException("Failed to launch updater process.", ex);
             }
 

AlayaCore/Services/ManifestService.cs

@@ -3,54 +3,76 @@ using System.IO;
 using System.Net.Http;
 using System.Threading;
 using System.Threading.Tasks;
+using AlayaCore.Abstractions.Interfaces;
 using AlayaCore.Abstractions.Interfaces.Clients;
+using AlayaCore.Abstractions.Interfaces.Policies;
 using AlayaCore.Abstractions.Interfaces.Services;
 using AlayaCore.Models.Configuration;
 using AlayaCore.Models.Manifests;
 using AlayaCore.Models.Manifests.DTO;
+using AlayaCore.Utilities.Enums;
 using AlayaCore.Utilities.Extensions;
+using Microsoft.Extensions.Logging;
 using Newtonsoft.Json;
 
 namespace AlayaCore.Services
 {
     public sealed class ManifestService : IManifestService
     {
-        private const string CORE_MANIFEST_FILE_NAME = "CoreManifest.json";
+        private const string ALAYA_MANIFEST_FILE_NAME = "AlayaManifest.json";
         private const string LAUNCHER_MANIFEST_FILE_NAME = "LauncherManifest.json";
         private const string INSTALLED_MODS_MANIFEST_FILE_NAME = "InstalledModsManifest.json";
 
         private readonly IDownloadService _downloadService;
         private readonly IHttpClient _httpClient;
+        private readonly IFileStore _fileStore;
         private readonly ManifestServiceOptions _options;
+        private readonly IRetryPolicy _retryPolicy;
+        private readonly ILogger<ManifestService> _logger;
 
         public ManifestService(
             IDownloadService downloadService,
             IHttpClient httpClient,
-            ManifestServiceOptions options)
+            IFileStore fileStore,
+            ManifestServiceOptions options,
+            IRetryPolicy retryPolicy,
+            ILogger<ManifestService> logger)
         {
             _downloadService = downloadService ?? throw new ArgumentNullException(nameof(downloadService));
             _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
+            _fileStore = fileStore ?? throw new ArgumentNullException(nameof(fileStore));
             _options = options ?? throw new ArgumentNullException(nameof(options));
+            _retryPolicy = retryPolicy ?? throw new ArgumentNullException(nameof(retryPolicy));
+            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
         }
 
-        public Task<ManifestModel> GetCoreManifestAsync(CancellationToken cancellationToken = default)
+        public Task<ManifestModel> GetAlayaManifestAsync(CancellationToken cancellationToken = default)
         {
             string destinationPath = GetCoreManifestPath();
 
+            _logger.LogInformation(
+                "Downloading and loading Alaya manifest from {ManifestUri} to {DestinationPath}.",
+                _options.AlayaManifestUri,
+                destinationPath);
+
             return DownloadAndLoadManifestAsync<ManifestDto, ManifestModel>(
-                _options.CoreManifestUri,
+                _options.AlayaManifestUri,
                 destinationPath,
-                _options.CoreManifestSha512Hash,
+                _options.AlayaManifestSha512Hash,
                 static dto => dto.ToModel(),
                 cancellationToken);
         }
 
-        public async Task<InstalledModsManifestModel> GetInstalledModsManifestAsync(CancellationToken cancellationToken = default)
+        public async Task<InstalledModsManifestModel> GetInstalledModsManifestAsync(
+            CancellationToken cancellationToken = default)
         {
             string path = GetInstalledModsManifestPath();
 
+            _logger.LogDebug("Loading installed mods manifest from {ManifestPath}.", path);
+
             if (!File.Exists(path))
             {
+                _logger.LogInformation("Installed mods manifest was not found at {ManifestPath}. Returning an empty manifest.", path);
                 return InstalledModsManifestModel.Empty();
             }
 
@@ -58,22 +80,40 @@ namespace AlayaCore.Services
 
             if (string.IsNullOrWhiteSpace(json))
             {
+                _logger.LogWarning("Installed mods manifest at {ManifestPath} was empty. Returning an empty manifest.", path);
                 return InstalledModsManifestModel.Empty();
             }
 
-            InstalledModsManifestModel? manifest = DeserializeAndMapManifest<InstalledModsManifestDto, InstalledModsManifestModel>(
+            InstalledModsManifestModel? manifest =
-                json,
+                DeserializeAndMapManifest<InstalledModsManifestDto, InstalledModsManifestModel>(
-                path,
+                    json,
-                static dto => dto.ToModel(),
+                    path,
-                swallowDeserializationErrors: true);
+                    static dto => dto.ToModel(),
+                    swallowDeserializationErrors: true);
 
-            return manifest ?? InstalledModsManifestModel.Empty();
+            if (manifest == null)
+            {
+                _logger.LogWarning("Installed mods manifest at {ManifestPath} could not be deserialized. Returning an empty manifest.", path);
+                return InstalledModsManifestModel.Empty();
+            }
+
+            _logger.LogInformation(
+                "Loaded installed mods manifest from {ManifestPath}. Mod count: {ModCount}",
+                path,
+                manifest.Mods.Count);
+
+            return manifest;
         }
 
         public Task<LauncherManifestModel> GetLauncherManifestAsync(CancellationToken cancellationToken = default)
         {
             string destinationPath = GetLauncherManifestPath();
 
+            _logger.LogInformation(
+                "Downloading and loading launcher manifest from {ManifestUri} to {DestinationPath}.",
+                _options.LauncherManifestUri,
+                destinationPath);
+
             return DownloadAndLoadManifestAsync<LauncherManifestDto, LauncherManifestModel>(
                 _options.LauncherManifestUri,
                 destinationPath,
@@ -82,103 +122,105 @@ namespace AlayaCore.Services
                 cancellationToken);
         }
 
-        public Task<ManifestModel?> GetLocalCoreManifestAsync(CancellationToken cancellationToken = default)
+        public Task<ManifestModel?> GetLocalAlayaManifestAsync(CancellationToken cancellationToken = default)
         {
+            string path = GetCoreManifestPath();
+
+            _logger.LogDebug("Loading local Alaya manifest from {ManifestPath}.", path);
+
             return LoadLocalManifestAsync<ManifestDto, ManifestModel>(
-                GetCoreManifestPath(),
+                path,
                 static dto => dto.ToModel(),
                 cancellationToken);
         }
 
         public Task<LauncherManifestModel?> GetLocalLauncherManifestAsync(CancellationToken cancellationToken = default)
         {
+            string path = GetLauncherManifestPath();
+
+            _logger.LogDebug("Loading local launcher manifest from {ManifestPath}.", path);
+
             return LoadLocalManifestAsync<LauncherManifestDto, LauncherManifestModel>(
-                GetLauncherManifestPath(),
+                path,
                 static dto => dto.ToModel(),
                 cancellationToken);
         }
 
         public async Task<Version> GetRemoteCoreManifestVersionAsync(CancellationToken cancellationToken = default)
         {
-            cancellationToken.ThrowIfCancellationRequested();
+            _logger.LogDebug("Fetching remote Alaya manifest version from {ManifestUri}.", _options.AlayaManifestUri);
 
-            using HttpResponseMessage response = await _httpClient.GetAsync(
+            ManifestModel remoteManifest = await GetRemoteManifestAsync<ManifestDto, ManifestModel>(
-                _options.CoreManifestUri,
+                _options.AlayaManifestUri,
-                HttpCompletionOption.ResponseContentRead,
-                cancellationToken).ConfigureAwait(false);
-
-            response.EnsureSuccessStatusCode();
-
-            string json = await response.Content.ReadAsStringAsync().ConfigureAwait(false);
-
-            if (string.IsNullOrWhiteSpace(json))
-            {
-                throw new InvalidDataException(
-                    $"Remote core manifest response from '{_options.CoreManifestUri}' was empty.");
-            }
-
-            ManifestModel remoteManifest = DeserializeAndMapManifest<ManifestDto, ManifestModel>(
-                json,
-                _options.CoreManifestUri.ToString(),
                 static dto => dto.ToModel(),
-                swallowDeserializationErrors: false)!;
+                cancellationToken).ConfigureAwait(false);
 
             if (remoteManifest.AlayaVersion == null)
             {
+                _logger.LogError("Remote Alaya manifest from {ManifestUri} did not contain a valid version.", _options.AlayaManifestUri);
                 throw new InvalidDataException(
-                    $"Remote core manifest from '{_options.CoreManifestUri}' does not contain a valid version.");
+                    $"Remote core manifest from '{_options.AlayaManifestUri}' does not contain a valid version.");
             }
 
+            _logger.LogInformation(
+                "Fetched remote Alaya manifest version {RemoteVersion} from {ManifestUri}.",
+                remoteManifest.AlayaVersion,
+                _options.AlayaManifestUri);
+
             return remoteManifest.AlayaVersion;
         }
 
-        public async Task<string> GetRemoteLauncherManifestHashAsync(CancellationToken cancellationToken = default)
+        public async Task<LauncherManifestModel> GetRemoteLauncherManifestAsync(
+            CancellationToken cancellationToken = default)
         {
-            cancellationToken.ThrowIfCancellationRequested();
+            _logger.LogDebug("Fetching remote launcher manifest from {ManifestUri}.", _options.LauncherManifestUri);
 
-            using HttpResponseMessage response = await _httpClient.GetAsync(
+            LauncherManifestModel remoteManifest = await GetRemoteManifestAsync<LauncherManifestDto, LauncherManifestModel>(
                 _options.LauncherManifestUri,
-                HttpCompletionOption.ResponseContentRead,
-                cancellationToken).ConfigureAwait(false);
-
-            response.EnsureSuccessStatusCode();
-
-            string json = await response.Content.ReadAsStringAsync().ConfigureAwait(false);
-
-            if (string.IsNullOrWhiteSpace(json))
-            {
-                throw new InvalidDataException(
-                    $"Remote launcher manifest response from '{_options.LauncherManifestUri}' was empty.");
-            }
-
-            LauncherManifestModel remoteManifest = DeserializeAndMapManifest<LauncherManifestDto, LauncherManifestModel>(
-                json,
-                _options.LauncherManifestUri.ToString(),
                 static dto => dto.ToModel(),
-                swallowDeserializationErrors: false)!;
+                cancellationToken).ConfigureAwait(false);
 
             if (string.IsNullOrWhiteSpace(remoteManifest.Sha512Hash))
             {
+                _logger.LogError("Remote launcher manifest from {ManifestUri} did not contain a valid SHA-512 hash.", _options.LauncherManifestUri);
                 throw new InvalidDataException(
                     $"Remote launcher manifest from '{_options.LauncherManifestUri}' does not contain a valid SHA-512 hash.");
             }
 
-            return remoteManifest.Sha512Hash.Trim();
+            if (remoteManifest.DownloadUri == null || !remoteManifest.DownloadUri.IsAbsoluteUri)
+            {
+                _logger.LogError("Remote launcher manifest from {ManifestUri} did not contain a valid download URI.", _options.LauncherManifestUri);
+                throw new InvalidDataException(
+                    $"Remote launcher manifest from '{_options.LauncherManifestUri}' does not contain a valid download URI.");
+            }
+
+            _logger.LogInformation(
+                "Fetched remote launcher manifest. Version: {Version}, DownloadUri: {DownloadUri}",
+                remoteManifest.Version,
+                remoteManifest.DownloadUri);
+
+            return remoteManifest;
         }
 
         public string GetLauncherManifestPath()
         {
-            return Path.Combine(_options.ManifestDirectoryPath, LAUNCHER_MANIFEST_FILE_NAME);
+            string path = Path.Combine(_fileStore.Get(FolderLocation.Manifests), LAUNCHER_MANIFEST_FILE_NAME);
+            _logger.LogDebug("Resolved launcher manifest path to {ManifestPath}.", path);
+            return path;
         }
 
         public string GetCoreManifestPath()
         {
-            return Path.Combine(_options.ManifestDirectoryPath, CORE_MANIFEST_FILE_NAME);
+            string path = Path.Combine(_fileStore.Get(FolderLocation.Manifests), ALAYA_MANIFEST_FILE_NAME);
+            _logger.LogDebug("Resolved Alaya manifest path to {ManifestPath}.", path);
+            return path;
         }
 
         public string GetInstalledModsManifestPath()
         {
-            return Path.Combine(_options.ManifestDirectoryPath, INSTALLED_MODS_MANIFEST_FILE_NAME);
+            string path = Path.Combine(_fileStore.Get(FolderLocation.Manifests), INSTALLED_MODS_MANIFEST_FILE_NAME);
+            _logger.LogDebug("Resolved installed mods manifest path to {ManifestPath}.", path);
+            return path;
         }
 
         private async Task<TModel?> LoadLocalManifestAsync<TDto, TModel>(
@@ -199,6 +241,7 @@ namespace AlayaCore.Services
 
             if (!File.Exists(path))
             {
+                _logger.LogInformation("Local manifest was not found at {ManifestPath}.", path);
                 return default;
             }
 
@@ -206,14 +249,26 @@ namespace AlayaCore.Services
 
             if (string.IsNullOrWhiteSpace(json))
             {
+                _logger.LogWarning("Local manifest at {ManifestPath} was empty.", path);
                 return default;
             }
 
-            return DeserializeAndMapManifest<TDto, TModel>(
+            TModel? model = DeserializeAndMapManifest(
                 json,
                 path,
                 map,
                 swallowDeserializationErrors: true);
+
+            if (model == null)
+            {
+                _logger.LogWarning("Local manifest at {ManifestPath} could not be deserialized or mapped.", path);
+            }
+            else
+            {
+                _logger.LogDebug("Successfully loaded local manifest from {ManifestPath}.", path);
+            }
+
+            return model;
         }
 
         private async Task<TModel> DownloadAndLoadManifestAsync<TDto, TModel>(
@@ -253,14 +308,26 @@ namespace AlayaCore.Services
 
             EnsureDirectoryExists(destinationPath);
 
-            await _downloadService.DownloadFileAsync(
+            _logger.LogInformation(
+                "Downloading manifest from {ManifestUri} to {DestinationPath}.",
                 manifestUri,
-                destinationPath,
+                destinationPath);
-                sha512Hash,
+
-                cancellationToken: cancellationToken).ConfigureAwait(false);
+            await _retryPolicy.ExecuteAsync(
+                async token =>
+                {
+                    await _downloadService.DownloadFileAsync(
+                        manifestUri,
+                        destinationPath,
+                        sha512Hash,
+                        cancellationToken: token).ConfigureAwait(false);
+                },
+                $"manifest-download:{Path.GetFileName(destinationPath)}",
+                cancellationToken).ConfigureAwait(false);
 
             if (!File.Exists(destinationPath))
             {
+                _logger.LogError("Manifest file was not found after download at {DestinationPath}.", destinationPath);
                 throw new FileNotFoundException("Manifest file was not found after download.", destinationPath);
             }
 
@@ -268,17 +335,83 @@ namespace AlayaCore.Services
 
             if (string.IsNullOrWhiteSpace(json))
             {
+                _logger.LogError("Downloaded manifest file at {DestinationPath} was empty.", destinationPath);
                 throw new InvalidDataException($"Manifest file '{destinationPath}' was empty.");
             }
 
-            return DeserializeAndMapManifest<TDto, TModel>(
+            TModel model = DeserializeAndMapManifest(
                 json,
                 destinationPath,
                 map,
                 swallowDeserializationErrors: false)!;
+
+            _logger.LogInformation(
+                "Downloaded and loaded manifest successfully from {ManifestUri} into {DestinationPath}.",
+                manifestUri,
+                destinationPath);
+
+            return model;
         }
 
-        private static TModel? DeserializeAndMapManifest<TDto, TModel>(
+        private async Task<TModel> GetRemoteManifestAsync<TDto, TModel>(
+            Uri manifestUri,
+            Func<TDto, TModel> map,
+            CancellationToken cancellationToken)
+            where TDto : class
+        {
+            if (manifestUri == null)
+            {
+                throw new ArgumentNullException(nameof(manifestUri));
+            }
+
+            if (!manifestUri.IsAbsoluteUri)
+            {
+                throw new ArgumentException("Manifest URI must be absolute.", nameof(manifestUri));
+            }
+
+            if (map == null)
+            {
+                throw new ArgumentNullException(nameof(map));
+            }
+
+            cancellationToken.ThrowIfCancellationRequested();
+
+            _logger.LogDebug("Fetching remote manifest from {ManifestUri}.", manifestUri);
+
+            return await _retryPolicy.ExecuteAsync(
+                async token =>
+                {
+                    using HttpResponseMessage response = await _httpClient.GetAsync(
+                        manifestUri,
+                        HttpCompletionOption.ResponseContentRead,
+                        token).ConfigureAwait(false);
+
+                    response.EnsureSuccessStatusCode();
+
+                    string json = await response.Content.ReadAsStringAsync().ConfigureAwait(false);
+
+                    if (string.IsNullOrWhiteSpace(json))
+                    {
+                        _logger.LogError("Remote manifest response from {ManifestUri} was empty.", manifestUri);
+                        throw new InvalidDataException(
+                            $"Remote manifest response from '{manifestUri}' was empty.");
+                    }
+
+                    TModel model = DeserializeAndMapManifest(
+                        json,
+                        manifestUri.ToString(),
+                        map,
+                        swallowDeserializationErrors: false)!;
+
+                    _logger.LogDebug("Successfully fetched and mapped remote manifest from {ManifestUri}.", manifestUri);
+
+                    return model;
+                },
+                $"manifest-fetch:{manifestUri.AbsolutePath}",
+                cancellationToken).ConfigureAwait(false);
+        }
+
+        private TModel? DeserializeAndMapManifest<TDto, TModel>(
             string json,
             string sourceName,
             Func<TDto, TModel> map,
@@ -289,9 +422,11 @@ namespace AlayaCore.Services
             {
                 if (swallowDeserializationErrors)
                 {
+                    _logger.LogWarning("Manifest source {SourceName} was empty and deserialization errors were configured to be swallowed.", sourceName);
                     return default;
                 }
 
+                _logger.LogError("Manifest source {SourceName} was empty.", sourceName);
                 throw new InvalidDataException($"Manifest source '{sourceName}' was empty.");
             }
 
@@ -314,9 +449,11 @@ namespace AlayaCore.Services
             {
                 if (swallowDeserializationErrors)
                 {
+                    _logger.LogWarning(ex, "Failed to deserialize manifest source {SourceName} to {DtoType}. Returning default because deserialization errors are being swallowed.", sourceName, typeof(TDto).Name);
                     return default;
                 }
 
+                _logger.LogError(ex, "Failed to deserialize manifest source {SourceName} to {DtoType}.", sourceName, typeof(TDto).Name);
                 throw new JsonSerializationException(
                     $"Failed to deserialize manifest source '{sourceName}' to {typeof(TDto).Name}.",
                     ex);
@@ -326,24 +463,34 @@ namespace AlayaCore.Services
             {
                 if (swallowDeserializationErrors)
                 {
+                    _logger.LogWarning("Deserialization of manifest source {SourceName} to {DtoType} returned null. Returning default because deserialization errors are being swallowed.", sourceName, typeof(TDto).Name);
                     return default;
                 }
 
+                _logger.LogError("Deserialization of manifest source {SourceName} to {DtoType} returned null.", sourceName, typeof(TDto).Name);
                 throw new JsonSerializationException(
                     $"Failed to deserialize manifest source '{sourceName}' to {typeof(TDto).Name}.");
             }
 
             try
             {
-                return map(dto);
+                TModel model = map(dto);
+                _logger.LogDebug(
+                    "Mapped manifest source {SourceName} from {DtoType} to {ModelType}.",
+                    sourceName,
+                    typeof(TDto).Name,
+                    typeof(TModel).Name);
+                return model;
             }
-            catch (Exception ex) when (!(ex is OperationCanceledException))
+            catch (Exception ex) when (ex is not OperationCanceledException)
             {
                 if (swallowDeserializationErrors)
                 {
+                    _logger.LogWarning(ex, "Manifest source {SourceName} was deserialized but could not be mapped to {ModelType}. Returning default because mapping errors are being swallowed.", sourceName, typeof(TModel).Name);
                     return default;
                 }
 
+                _logger.LogError(ex, "Manifest source {SourceName} was deserialized but could not be mapped to {ModelType}.", sourceName, typeof(TModel).Name);
                 throw new InvalidDataException(
                     $"Manifest source '{sourceName}' was deserialized but could not be mapped to {typeof(TModel).Name}.",
                     ex);

AlayaCore/Services/ModService.cs

@@ -5,15 +5,19 @@ using System.Linq;
 using System.Net.Http;
 using System.Threading;
 using System.Threading.Tasks;
+using AlayaCore.Abstractions.Interfaces;
 using AlayaCore.Abstractions.Interfaces.Clients;
+using AlayaCore.Abstractions.Interfaces.Policies;
 using AlayaCore.Abstractions.Interfaces.Services;
 using AlayaCore.Installation;
 using AlayaCore.Models;
 using AlayaCore.Models.Configuration;
 using AlayaCore.Models.Manifests;
 using AlayaCore.Models.Manifests.DTO;
+using AlayaCore.Models.Progress;
 using AlayaCore.Utilities.Enums;
 using AlayaCore.Utilities.Extensions;
+using Microsoft.Extensions.Logging;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
 
@@ -21,28 +25,35 @@ namespace AlayaCore.Services
 {
     public sealed class ModService : IModService
     {
-        private const string InstalledModsManifestFileName = "InstalledModsManifest.json";
+        private const string INSTALLED_MODS_MANIFEST_FILE_NAME = "InstalledModsManifest.json";
 
         private readonly IDownloadService _downloadService;
         private readonly ModrinthConnectionOptions _options;
-        private readonly ManifestServiceOptions _manifestOptions;
         private readonly IHttpClient _httpClient;
+        private readonly IFileStore _fileStore;
+        private readonly IRetryPolicy _retryPolicy;
+        private readonly ILogger<ModService> _logger;
 
         public ModService(
             IDownloadService downloadService,
             ModrinthConnectionOptions options,
-            ManifestServiceOptions manifestOptions,
+            IHttpClient httpClient,
-            IHttpClient httpClient)
+            IFileStore fileStore,
+            IRetryPolicy retryPolicy,
+            ILogger<ModService> logger)
         {
             _downloadService = downloadService ?? throw new ArgumentNullException(nameof(downloadService));
             _options = options ?? throw new ArgumentNullException(nameof(options));
-            _manifestOptions = manifestOptions ?? throw new ArgumentNullException(nameof(manifestOptions));
             _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
+            _fileStore = fileStore ?? throw new ArgumentNullException(nameof(fileStore));
+            _retryPolicy = retryPolicy ?? throw new ArgumentNullException(nameof(retryPolicy));
+            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
         }
 
         public async Task ProcessModsAsync(
             ManifestModel manifest,
             InstallEnvironment environment,
+            IProgress<DownloadProgress>? progress = null,
             CancellationToken cancellationToken = default)
         {
             if (manifest == null)
@@ -61,9 +72,15 @@ namespace AlayaCore.Services
 
             List<ModFileEntry> requiredMods = manifest.Files
                 .Where(file => file.Type == FileType.Mod)
+                .OrderBy(file => file.FileName, StringComparer.OrdinalIgnoreCase)
                 .ToList();
 
-            RemoveStaleMods(requiredMods);
+            _logger.LogInformation(
+                "Starting mod sync. RequiredMods: {RequiredModCount}, InstalledModsManifestEntries: {InstalledModCount}",
+                requiredMods.Count,
+                installedMods.Count);
+
+            RemoveStaleMods(requiredMods, cancellationToken);
 
             List<ModFileEntry> finalInstalledMods = new List<ModFileEntry>();
 
@@ -71,6 +88,12 @@ namespace AlayaCore.Services
             {
                 cancellationToken.ThrowIfCancellationRequested();
 
+                _logger.LogDebug(
+                    "Processing required mod {FileName}. Expected SHA-512: {Sha512Hash}, Expected Size: {Size}",
+                    requiredMod.FileName,
+                    requiredMod.Sha512Hash,
+                    requiredMod.Size);
+
                 ModFileEntry? installedMod = installedMods.FirstOrDefault(
                     mod => string.Equals(mod.FileName, requiredMod.FileName, StringComparison.OrdinalIgnoreCase));
 
@@ -84,18 +107,50 @@ namespace AlayaCore.Services
 
                 if (isValidInstalledMod)
                 {
+                    _logger.LogInformation(
+                        "Mod {FileName} is already installed and valid. Skipping download.",
+                        requiredMod.FileName);
+
                     finalInstalledMods.Add(installedMod!);
                     continue;
                 }
 
+                if (installedMod == null)
+                {
+                    _logger.LogInformation(
+                        "Mod {FileName} is missing locally and will be downloaded.",
+                        requiredMod.FileName);
+                }
+                else
+                {
+                    _logger.LogWarning(
+                        "Mod {FileName} is present but invalid or outdated. Stored SHA-512: {InstalledHash}, Expected SHA-512: {RequiredHash}, Stored Size: {InstalledSize}, Expected Size: {RequiredSize}",
+                        requiredMod.FileName,
+                        installedMod.Sha512Hash,
+                        requiredMod.Sha512Hash,
+                        installedMod.Size,
+                        requiredMod.Size);
+                }
+
                 Uri modUri = await ResolveModUrlAsync(requiredMod, cancellationToken).ConfigureAwait(false);
 
+                _logger.LogInformation(
+                    "Downloading mod {FileName} from {ModUri} to {DestinationPath}.",
+                    requiredMod.FileName,
+                    modUri,
+                    destinationPath);
+
                 await _downloadService.DownloadFileAsync(
                     modUri,
                     destinationPath,
                     requiredMod.Sha512Hash,
+                    progress,
                     cancellationToken: cancellationToken).ConfigureAwait(false);
 
+                _logger.LogInformation(
+                    "Download completed successfully for mod {FileName}.",
+                    requiredMod.FileName);
+
                 finalInstalledMods.Add(new ModFileEntry(
                     requiredMod.FileName,
                     requiredMod.Type,
@@ -104,6 +159,10 @@ namespace AlayaCore.Services
             }
 
             await FlushInstalledModsManifestAsync(finalInstalledMods, cancellationToken).ConfigureAwait(false);
+
+            _logger.LogInformation(
+                "Mod sync completed successfully. Final installed mod count: {InstalledModCount}",
+                finalInstalledMods.Count);
         }
 
         private static bool IsInstalledModUpToDate(
@@ -144,90 +203,156 @@ namespace AlayaCore.Services
 
             if (string.IsNullOrWhiteSpace(fileEntry.Sha512Hash))
             {
+                _logger.LogError(
+                    "Failed to resolve mod URL because mod {FileName} did not contain a SHA-512 hash.",
+                    fileEntry.FileName);
+
                 throw new InvalidOperationException($"Mod '{fileEntry.FileName}' does not contain a SHA-512 hash.");
             }
 
             string versionEndpoint = BuildVersionEndpoint(fileEntry.Sha512Hash);
 
-            using HttpResponseMessage response = await _httpClient.GetAsync(
+            _logger.LogDebug(
-                new Uri(versionEndpoint, UriKind.Absolute),
+                "Resolving mod URL for {FileName} using Modrinth endpoint {VersionEndpoint}.",
-                HttpCompletionOption.ResponseContentRead,
+                fileEntry.FileName,
+                versionEndpoint);
+
+            return await _retryPolicy.ExecuteAsync(
+                async token =>
+                {
+                    using HttpResponseMessage response = await _httpClient.GetAsync(
+                        new Uri(versionEndpoint, UriKind.Absolute),
+                        HttpCompletionOption.ResponseContentRead,
+                        token).ConfigureAwait(false);
+
+                    response.EnsureSuccessStatusCode();
+
+                    string json = await response.Content.ReadAsStringAsync().ConfigureAwait(false);
+
+                    if (string.IsNullOrWhiteSpace(json))
+                    {
+                        _logger.LogError(
+                            "Mod metadata response for {FileName} from {VersionEndpoint} was empty.",
+                            fileEntry.FileName,
+                            versionEndpoint);
+
+                        throw new InvalidDataException($"The mod metadata response for '{fileEntry.FileName}' was empty.");
+                    }
+
+                    JObject jsonObject = JObject.Parse(json);
+
+                    JArray? filesArray = jsonObject["files"] as JArray;
+                    if (filesArray == null || filesArray.Count == 0)
+                    {
+                        _logger.LogError(
+                            "Mod metadata response for {FileName} did not contain any files.",
+                            fileEntry.FileName);
+
+                        throw new InvalidDataException($"The mod metadata response for '{fileEntry.FileName}' did not contain any files.");
+                    }
+
+                    JObject? selectedFile = filesArray
+                                                .OfType<JObject>()
+                                                .FirstOrDefault(file => file.Value<bool?>("primary") == true)
+                                            ?? filesArray.OfType<JObject>().FirstOrDefault();
+
+                    if (selectedFile == null)
+                    {
+                        _logger.LogError(
+                            "Mod metadata response for {FileName} did not contain a usable file entry.",
+                            fileEntry.FileName);
+
+                        throw new InvalidDataException($"The mod metadata response for '{fileEntry.FileName}' did not contain a usable file entry.");
+                    }
+
+                    JObject? hashesObject = selectedFile["hashes"] as JObject;
+                    if (hashesObject == null)
+                    {
+                        _logger.LogError(
+                            "Mod metadata response for {FileName} did not contain a hashes object.",
+                            fileEntry.FileName);
+
+                        throw new InvalidDataException(
+                            $"The mod metadata response for '{fileEntry.FileName}' did not contain a hashes object.");
+                    }
+
+                    string? remoteSha512Hash = hashesObject.Value<string>("sha512");
+                    if (string.IsNullOrWhiteSpace(remoteSha512Hash))
+                    {
+                        _logger.LogError(
+                            "Mod metadata response for {FileName} did not contain a valid SHA-512 hash.",
+                            fileEntry.FileName);
+
+                        throw new InvalidDataException(
+                            $"The mod metadata response for '{fileEntry.FileName}' did not contain a valid SHA-512 hash.");
+                    }
+
+                    if (!string.Equals(remoteSha512Hash, fileEntry.Sha512Hash, StringComparison.OrdinalIgnoreCase))
+                    {
+                        _logger.LogError(
+                            "Mod metadata hash mismatch for {FileName}. Remote SHA-512: {RemoteHash}, Required SHA-512: {RequiredHash}",
+                            fileEntry.FileName,
+                            remoteSha512Hash,
+                            fileEntry.Sha512Hash);
+
+                        throw new InvalidDataException(
+                            $"The mod metadata SHA-512 hash for '{fileEntry.FileName}' did not match the required manifest hash.");
+                    }
+
+                    long? size = selectedFile.Value<long?>("size");
+                    if (!size.HasValue || size.Value <= 0)
+                    {
+                        _logger.LogError(
+                            "Mod metadata response for {FileName} did not contain a valid file size.",
+                            fileEntry.FileName);
+
+                        throw new InvalidDataException(
+                            $"The mod metadata response for '{fileEntry.FileName}' did not contain a valid file size.");
+                    }
+
+                    if (size.Value != fileEntry.Size)
+                    {
+                        _logger.LogError(
+                            "Mod metadata size mismatch for {FileName}. Remote Size: {RemoteSize}, Required Size: {RequiredSize}",
+                            fileEntry.FileName,
+                            size.Value,
+                            fileEntry.Size);
+
+                        throw new InvalidDataException(
+                            $"The mod metadata size for '{fileEntry.FileName}' did not match the required manifest size.");
+                    }
+
+                    string? modUrl = selectedFile.Value<string>("url");
+                    if (string.IsNullOrWhiteSpace(modUrl))
+                    {
+                        _logger.LogError(
+                            "Mod metadata response for {FileName} did not contain a valid file URL.",
+                            fileEntry.FileName);
+
+                        throw new InvalidDataException(
+                            $"The mod metadata response for '{fileEntry.FileName}' did not contain a valid file URL.");
+                    }
+
+                    if (!Uri.TryCreate(modUrl, UriKind.Absolute, out Uri? result))
+                    {
+                        _logger.LogError(
+                            "Mod metadata response for {FileName} contained an invalid file URL: {ModUrl}",
+                            fileEntry.FileName,
+                            modUrl);
+
+                        throw new InvalidDataException(
+                            $"The mod metadata response for '{fileEntry.FileName}' contained an invalid file URL.");
+                    }
+
+                    _logger.LogDebug(
+                        "Resolved download URL for mod {FileName} to {ModUrl}.",
+                        fileEntry.FileName,
+                        result);
+
+                    return result;
+                },
+                $"mod-metadata:{fileEntry.FileName}",
                 cancellationToken).ConfigureAwait(false);
-
-            response.EnsureSuccessStatusCode();
-
-            string json = await response.Content.ReadAsStringAsync().ConfigureAwait(false);
-
-            if (string.IsNullOrWhiteSpace(json))
-            {
-                throw new InvalidDataException($"The mod metadata response for '{fileEntry.FileName}' was empty.");
-            }
-
-            JObject jsonObject = JObject.Parse(json);
-
-            JArray? filesArray = jsonObject["files"] as JArray;
-            if (filesArray == null || filesArray.Count == 0)
-            {
-                throw new InvalidDataException($"The mod metadata response for '{fileEntry.FileName}' did not contain any files.");
-            }
-
-            JObject? selectedFile = filesArray
-                                        .OfType<JObject>()
-                                        .FirstOrDefault(file => file.Value<bool?>("primary") == true)
-                                    ?? filesArray.OfType<JObject>().FirstOrDefault();
-
-            if (selectedFile == null)
-            {
-                throw new InvalidDataException($"The mod metadata response for '{fileEntry.FileName}' did not contain a usable file entry.");
-            }
-
-            JObject? hashesObject = selectedFile["hashes"] as JObject;
-            if (hashesObject == null)
-            {
-                throw new InvalidDataException(
-                    $"The mod metadata response for '{fileEntry.FileName}' did not contain a hashes object.");
-            }
-
-            string? remoteSha512Hash = hashesObject.Value<string>("sha512");
-            if (string.IsNullOrWhiteSpace(remoteSha512Hash))
-            {
-                throw new InvalidDataException(
-                    $"The mod metadata response for '{fileEntry.FileName}' did not contain a valid SHA-512 hash.");
-            }
-
-            if (!string.Equals(remoteSha512Hash, fileEntry.Sha512Hash, StringComparison.OrdinalIgnoreCase))
-            {
-                throw new InvalidDataException(
-                    $"The mod metadata SHA-512 hash for '{fileEntry.FileName}' did not match the required manifest hash.");
-            }
-
-            long? size = selectedFile.Value<long?>("size");
-            if (!size.HasValue || size.Value <= 0)
-            {
-                throw new InvalidDataException(
-                    $"The mod metadata response for '{fileEntry.FileName}' did not contain a valid file size.");
-            }
-
-            if (size.Value != fileEntry.Size)
-            {
-                throw new InvalidDataException(
-                    $"The mod metadata size for '{fileEntry.FileName}' did not match the required manifest size.");
-            }
-
-            string? modUrl = selectedFile.Value<string>("url");
-            if (string.IsNullOrWhiteSpace(modUrl))
-            {
-                throw new InvalidDataException(
-                    $"The mod metadata response for '{fileEntry.FileName}' did not contain a valid file URL.");
-            }
-
-            if (!Uri.TryCreate(modUrl, UriKind.Absolute, out Uri? result))
-            {
-                throw new InvalidDataException(
-                    $"The mod metadata response for '{fileEntry.FileName}' contained an invalid file URL.");
-            }
-
-            return result;
         }
 
         private string BuildVersionEndpoint(string sha512Hash)
@@ -238,7 +363,7 @@ namespace AlayaCore.Services
             return $"{baseUrl}/version_file/{sha512Hash}";
         }
 
-        private static string GetModDestinationPath(ModFileEntry fileEntry)
+        private string GetModDestinationPath(ModFileEntry fileEntry)
         {
             if (fileEntry == null)
             {
@@ -251,26 +376,37 @@ namespace AlayaCore.Services
             }
 
             string modsDirectory = GetModsDirectoryPath();
-            Directory.CreateDirectory(modsDirectory);
+            string destinationPath = Path.Combine(modsDirectory, fileEntry.FileName);
 
-            return Path.Combine(modsDirectory, fileEntry.FileName);
+            _logger.LogDebug(
+                "Resolved destination path for mod {FileName} to {DestinationPath}.",
+                fileEntry.FileName,
+                destinationPath);
+
+            return destinationPath;
         }
 
-        private static string GetModsDirectoryPath()
+        private string GetModsDirectoryPath()
         {
-            return Path.Combine(AppContext.BaseDirectory, "Game", "mods");
+            string modsDirectory = _fileStore.GetOrCreate(FolderLocation.Mods);
+            _logger.LogDebug("Resolved mods directory to {ModsDirectory}.", modsDirectory);
+            return modsDirectory;
         }
 
-        private static void RemoveStaleMods(IEnumerable<ModFileEntry> requiredMods)
+        private void RemoveStaleMods(
+            IEnumerable<ModFileEntry> requiredMods,
+            CancellationToken cancellationToken)
         {
             if (requiredMods == null)
             {
                 throw new ArgumentNullException(nameof(requiredMods));
             }
 
-            string modsDirectory = GetModsDirectoryPath();
+            string modsDirectory = _fileStore.Get(FolderLocation.Mods);
+
             if (!Directory.Exists(modsDirectory))
             {
+                _logger.LogDebug("Mods directory {ModsDirectory} does not exist. No stale mods need removal.", modsDirectory);
                 return;
             }
 
@@ -281,10 +417,17 @@ namespace AlayaCore.Services
 
             foreach (string filePath in Directory.GetFiles(modsDirectory))
             {
+                cancellationToken.ThrowIfCancellationRequested();
+
                 string fileName = Path.GetFileName(filePath);
 
                 if (!requiredFileNames.Contains(fileName))
                 {
+                    _logger.LogInformation(
+                        "Removing stale mod file {FileName} at {FilePath}.",
+                        fileName,
+                        filePath);
+
                     File.Delete(filePath);
                 }
             }
@@ -302,24 +445,34 @@ namespace AlayaCore.Services
             List<ModFileEntry> entries = installedMods.ToList();
             InstalledModsManifestModel manifest = new InstalledModsManifestModel(entries);
 
-            string manifestsDirectory = _manifestOptions.ManifestDirectoryPath;
+            string manifestsDirectory = _fileStore.GetOrCreate(FolderLocation.Manifests);
-            Directory.CreateDirectory(manifestsDirectory);
 
-            string manifestPath = Path.Combine(manifestsDirectory, InstalledModsManifestFileName);
+            string manifestPath = Path.Combine(manifestsDirectory, INSTALLED_MODS_MANIFEST_FILE_NAME);
             string temporaryManifestPath = manifestPath + ".tmp";
 
             InstalledModsManifestDto dto = manifest.ToDto();
 
             string json = JsonConvert.SerializeObject(dto, Formatting.Indented);
 
+            _logger.LogDebug(
+                "Writing installed mods manifest to temporary path {TemporaryManifestPath}. EntryCount: {EntryCount}",
+                temporaryManifestPath,
+                entries.Count);
+
             await File.WriteAllTextAsync(temporaryManifestPath, json, cancellationToken).ConfigureAwait(false);
 
             if (File.Exists(manifestPath))
             {
+                _logger.LogDebug("Deleting previous installed mods manifest at {ManifestPath}.", manifestPath);
                 File.Delete(manifestPath);
             }
 
             File.Move(temporaryManifestPath, manifestPath);
+
+            _logger.LogInformation(
+                "Installed mods manifest updated successfully at {ManifestPath}. EntryCount: {EntryCount}",
+                manifestPath,
+                entries.Count);
         }
     }
 }

AlayaCore/Services/SettingsService.cs

@@ -2,55 +2,353 @@ using System;
 using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
+using AlayaCore.Abstractions.Configuration;
+using AlayaCore.Abstractions.Interfaces;
 using AlayaCore.Abstractions.Interfaces.Services;
 using AlayaCore.Models.Configuration;
+using AlayaCore.Utilities.Enums;
+using Microsoft.Extensions.Logging;
 using Newtonsoft.Json;
 
 namespace AlayaCore.Services
 {
     public sealed class SettingsService : ISettingsService
     {
-        private const string LauncherSettingsFileName = "Launcher.json";
+        private readonly IFileStore _fileStore;
+        private readonly ILogger<SettingsService> _logger;
 
         public LauncherOptions LauncherOptions { get; }
+        public GameOptions GameOptions { get; }
 
-        public SettingsService(LauncherOptions launcherOptions)
+        public SettingsService(
+            LauncherOptions launcherOptions,
+            GameOptions gameOptions,
+            IFileStore fileStore,
+            ILogger<SettingsService> logger)
         {
             LauncherOptions = launcherOptions ?? throw new ArgumentNullException(nameof(launcherOptions));
+            GameOptions = gameOptions ?? throw new ArgumentNullException(nameof(gameOptions));
+            _fileStore = fileStore ?? throw new ArgumentNullException(nameof(fileStore));
+            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
         }
 
         public async Task SetForceReinstallAsync(bool value, CancellationToken cancellationToken = default)
         {
+            _logger.LogInformation("Updating launcher option ForceReinstall to {ForceReinstall}.", value);
+
             LauncherOptions.ForceReinstall = value;
+
             await SaveLauncherOptionsAsync(cancellationToken).ConfigureAwait(false);
+
+            _logger.LogInformation("Launcher option ForceReinstall was updated and saved successfully.");
+        }
+
+        public async Task UpdateLaunchVersionAsync(string newVersion, CancellationToken cancellationToken = default)
+        {
+            string? normalizedVersion = string.IsNullOrWhiteSpace(newVersion)
+                ? null
+                : newVersion.Trim();
+
+            _logger.LogInformation(
+                "Updating game option LaunchVersion from {CurrentLaunchVersion} to {NewLaunchVersion}.",
+                GameOptions.LaunchVersion,
+                normalizedVersion);
+
+            GameOptions.LaunchVersion = normalizedVersion;
+
+            await SaveGameOptionsAsync(cancellationToken).ConfigureAwait(false);
+
+            _logger.LogInformation("Game option LaunchVersion was updated and saved successfully.");
+        }
+
+        public async Task SetMinimumRamMbAsync(int minimumRamMb, CancellationToken cancellationToken = default)
+        {
+            if (minimumRamMb <= 0)
+            {
+                throw new ArgumentOutOfRangeException(nameof(minimumRamMb), "Minimum RAM must be greater than zero.");
+            }
+
+            if (GameOptions.MaximumRamMb > 0 && minimumRamMb > GameOptions.MaximumRamMb)
+            {
+                throw new ArgumentException("Minimum RAM cannot be greater than maximum RAM.", nameof(minimumRamMb));
+            }
+
+            _logger.LogInformation(
+                "Updating game option MinimumRamMb from {CurrentMinimumRamMb} to {NewMinimumRamMb}.",
+                GameOptions.MinimumRamMb,
+                minimumRamMb);
+
+            GameOptions.MinimumRamMb = minimumRamMb;
+
+            await SaveGameOptionsAsync(cancellationToken).ConfigureAwait(false);
+
+            _logger.LogInformation("Game option MinimumRamMb was updated and saved successfully.");
+        }
+
+        public async Task SetMaximumRamMbAsync(int maximumRamMb, CancellationToken cancellationToken = default)
+        {
+            if (maximumRamMb <= 0)
+            {
+                throw new ArgumentOutOfRangeException(nameof(maximumRamMb), "Maximum RAM must be greater than zero.");
+            }
+
+            if (GameOptions.MinimumRamMb > 0 && maximumRamMb < GameOptions.MinimumRamMb)
+            {
+                throw new ArgumentException("Maximum RAM cannot be less than minimum RAM.", nameof(maximumRamMb));
+            }
+
+            _logger.LogInformation(
+                "Updating game option MaximumRamMb from {CurrentMaximumRamMb} to {NewMaximumRamMb}.",
+                GameOptions.MaximumRamMb,
+                maximumRamMb);
+
+            GameOptions.MaximumRamMb = maximumRamMb;
+
+            await SaveGameOptionsAsync(cancellationToken).ConfigureAwait(false);
+
+            _logger.LogInformation("Game option MaximumRamMb was updated and saved successfully.");
+        }
+
+        public async Task SetResolutionAsync(int screenWidth, int screenHeight, CancellationToken cancellationToken = default)
+        {
+            if (screenWidth <= 0)
+            {
+                throw new ArgumentOutOfRangeException(nameof(screenWidth), "Screen width must be greater than zero.");
+            }
+
+            if (screenHeight <= 0)
+            {
+                throw new ArgumentOutOfRangeException(nameof(screenHeight), "Screen height must be greater than zero.");
+            }
+
+            _logger.LogInformation(
+                "Updating game resolution from {CurrentWidth}x{CurrentHeight} to {NewWidth}x{NewHeight}.",
+                GameOptions.ScreenWidth,
+                GameOptions.ScreenHeight,
+                screenWidth,
+                screenHeight);
+
+            GameOptions.ScreenWidth = screenWidth;
+            GameOptions.ScreenHeight = screenHeight;
+
+            await SaveGameOptionsAsync(cancellationToken).ConfigureAwait(false);
+
+            _logger.LogInformation("Game resolution was updated and saved successfully.");
+        }
+
+        public async Task SetFullscreenAsync(bool fullscreen, CancellationToken cancellationToken = default)
+        {
+            _logger.LogInformation(
+                "Updating game option Fullscreen from {CurrentFullscreen} to {NewFullscreen}.",
+                GameOptions.Fullscreen,
+                fullscreen);
+
+            GameOptions.Fullscreen = fullscreen;
+
+            await SaveGameOptionsAsync(cancellationToken).ConfigureAwait(false);
+
+            _logger.LogInformation("Game option Fullscreen was updated and saved successfully.");
         }
 
         public async Task SaveLauncherOptionsAsync(CancellationToken cancellationToken = default)
         {
+            _logger.LogDebug("Saving launcher options to disk.");
+
             await SaveAsync(
-                LauncherSettingsFileName,
+                LauncherOptions.FileName,
                 LauncherOptions,
                 cancellationToken).ConfigureAwait(false);
+
+            _logger.LogInformation("Launcher options were saved successfully.");
         }
 
         public async Task LoadLauncherOptionsAsync(CancellationToken cancellationToken = default)
         {
+            _logger.LogDebug("Loading launcher options from disk.");
+
             LauncherOptions? loadedOptions = await LoadAsync<LauncherOptions>(
-                LauncherSettingsFileName,
+                LauncherOptions.FileName,
                 cancellationToken).ConfigureAwait(false);
 
             if (loadedOptions == null)
             {
+                _logger.LogInformation("No launcher options file was found or it was empty. Existing in-memory launcher options will be kept.");
                 return;
             }
 
             LauncherOptions.ForceReinstall = loadedOptions.ForceReinstall;
+
+            _logger.LogInformation(
+                "Launcher options were loaded successfully. ForceReinstall: {ForceReinstall}",
+                LauncherOptions.ForceReinstall);
+        }
+
+        public async Task SaveGameOptionsAsync(CancellationToken cancellationToken = default)
+        {
+            ValidateGameOptions(GameOptions);
+
+            _logger.LogDebug(
+                "Saving game options to disk. LaunchVersion: {LaunchVersion}, MinimumRamMb: {MinimumRamMb}, MaximumRamMb: {MaximumRamMb}, Resolution: {ScreenWidth}x{ScreenHeight}, Fullscreen: {Fullscreen}",
+                GameOptions.LaunchVersion,
+                GameOptions.MinimumRamMb,
+                GameOptions.MaximumRamMb,
+                GameOptions.ScreenWidth,
+                GameOptions.ScreenHeight,
+                GameOptions.Fullscreen);
+
+            await SaveAsync(
+                GameOptions.FileName,
+                GameOptions,
+                cancellationToken).ConfigureAwait(false);
+
+            _logger.LogInformation("Game options were saved successfully.");
+        }
+
+        public async Task LoadGameOptionsAsync(CancellationToken cancellationToken = default)
+        {
+            _logger.LogDebug("Loading game options from disk.");
+
+            GameOptions? loadedOptions = await LoadAsync<GameOptions>(
+                GameOptions.FileName,
+                cancellationToken).ConfigureAwait(false);
+
+            if (loadedOptions == null)
+            {
+                _logger.LogInformation("No game options file was found or it was empty. Applying default game options.");
+                ApplyGameOptions(GameOptions.Default);
+                return;
+            }
+
+            ApplyGameOptions(loadedOptions);
+
+            _logger.LogInformation(
+                "Game options were loaded successfully. LaunchVersion: {LaunchVersion}, MinimumRamMb: {MinimumRamMb}, MaximumRamMb: {MaximumRamMb}, Resolution: {ScreenWidth}x{ScreenHeight}, Fullscreen: {Fullscreen}",
+                GameOptions.LaunchVersion,
+                GameOptions.MinimumRamMb,
+                GameOptions.MaximumRamMb,
+                GameOptions.ScreenWidth,
+                GameOptions.ScreenHeight,
+                GameOptions.Fullscreen);
+        }
+
+        public async Task LoadAllAsync(CancellationToken cancellationToken = default)
+        {
+            _logger.LogInformation("Loading all settings from disk.");
+
+            await LoadLauncherOptionsAsync(cancellationToken).ConfigureAwait(false);
+            await LoadGameOptionsAsync(cancellationToken).ConfigureAwait(false);
+
+            _logger.LogInformation("All settings were loaded successfully.");
+        }
+
+        public async Task SaveAllAsync(CancellationToken cancellationToken = default)
+        {
+            _logger.LogInformation("Saving all settings to disk.");
+
+            await SaveLauncherOptionsAsync(cancellationToken).ConfigureAwait(false);
+            await SaveGameOptionsAsync(cancellationToken).ConfigureAwait(false);
+
+            _logger.LogInformation("All settings were saved successfully.");
+        }
+
+        private void ApplyGameOptions(GameOptions source)
+        {
+            if (source == null)
+            {
+                throw new ArgumentNullException(nameof(source));
+            }
+
+            _logger.LogDebug(
+                "Applying game options from source. LaunchVersion: {LaunchVersion}, MinimumRamMb: {MinimumRamMb}, MaximumRamMb: {MaximumRamMb}, Resolution: {ScreenWidth}x{ScreenHeight}, Fullscreen: {Fullscreen}",
+                source.LaunchVersion,
+                source.MinimumRamMb,
+                source.MaximumRamMb,
+                source.ScreenWidth,
+                source.ScreenHeight,
+                source.Fullscreen);
+
+            GameOptions.LaunchVersion = string.IsNullOrWhiteSpace(source.LaunchVersion)
+                ? null
+                : source.LaunchVersion.Trim();
+
+            GameOptions.MinimumRamMb = source.MinimumRamMb > 0
+                ? source.MinimumRamMb
+                : GameOptions.Default.MinimumRamMb;
+
+            GameOptions.MaximumRamMb = source.MaximumRamMb > 0
+                ? source.MaximumRamMb
+                : GameOptions.Default.MaximumRamMb;
+
+            GameOptions.ScreenWidth = source.ScreenWidth > 0
+                ? source.ScreenWidth
+                : GameOptions.Default.ScreenWidth;
+
+            GameOptions.ScreenHeight = source.ScreenHeight > 0
+                ? source.ScreenHeight
+                : GameOptions.Default.ScreenHeight;
+
+            GameOptions.Fullscreen = source.Fullscreen;
+
+            ValidateGameOptions(GameOptions);
+
+            _logger.LogDebug("Game options were applied successfully.");
+        }
+
+        private void ValidateGameOptions(GameOptions options)
+        {
+            if (options == null)
+            {
+                throw new ArgumentNullException(nameof(options));
+            }
+
+            _logger.LogDebug(
+                "Validating game options. MinimumRamMb: {MinimumRamMb}, MaximumRamMb: {MaximumRamMb}, ScreenWidth: {ScreenWidth}, ScreenHeight: {ScreenHeight}",
+                options.MinimumRamMb,
+                options.MaximumRamMb,
+                options.ScreenWidth,
+                options.ScreenHeight);
+
+            if (options.MinimumRamMb <= 0)
+            {
+                _logger.LogError("Game options validation failed because MinimumRamMb was {MinimumRamMb}.", options.MinimumRamMb);
+                throw new InvalidDataException("Minimum RAM must be greater than zero.");
+            }
+
+            if (options.MaximumRamMb <= 0)
+            {
+                _logger.LogError("Game options validation failed because MaximumRamMb was {MaximumRamMb}.", options.MaximumRamMb);
+                throw new InvalidDataException("Maximum RAM must be greater than zero.");
+            }
+
+            if (options.MinimumRamMb > options.MaximumRamMb)
+            {
+                _logger.LogError(
+                    "Game options validation failed because MinimumRamMb {MinimumRamMb} was greater than MaximumRamMb {MaximumRamMb}.",
+                    options.MinimumRamMb,
+                    options.MaximumRamMb);
+
+                throw new InvalidDataException("Minimum RAM cannot be greater than maximum RAM.");
+            }
+
+            if (options.ScreenWidth <= 0)
+            {
+                _logger.LogError("Game options validation failed because ScreenWidth was {ScreenWidth}.", options.ScreenWidth);
+                throw new InvalidDataException("Screen width must be greater than zero.");
+            }
+
+            if (options.ScreenHeight <= 0)
+            {
+                _logger.LogError("Game options validation failed because ScreenHeight was {ScreenHeight}.", options.ScreenHeight);
+                throw new InvalidDataException("Screen height must be greater than zero.");
+            }
+
+            _logger.LogDebug("Game options validation completed successfully.");
         }
 
         private async Task SaveAsync<T>(
             string fileName,
             T value,
-            CancellationToken cancellationToken)
+            CancellationToken cancellationToken) where T : BaseConfig
         {
             if (string.IsNullOrWhiteSpace(fileName))
             {
@@ -69,6 +367,7 @@ namespace AlayaCore.Services
 
             if (string.IsNullOrWhiteSpace(directoryPath))
             {
+                _logger.LogError("Could not resolve the settings directory path for file {FileName}.", fileName);
                 throw new InvalidOperationException("Could not resolve the settings directory path.");
             }
 
@@ -77,19 +376,28 @@ namespace AlayaCore.Services
             string temporaryPath = fullPath + ".tmp";
             string json = JsonConvert.SerializeObject(value, Formatting.Indented);
 
+            _logger.LogDebug(
+                "Writing settings file {FileName} to temporary path {TemporaryPath} before replacing {FullPath}.",
+                fileName,
+                temporaryPath,
+                fullPath);
+
             await File.WriteAllTextAsync(temporaryPath, json, cancellationToken).ConfigureAwait(false);
 
             if (File.Exists(fullPath))
             {
+                _logger.LogDebug("Deleting existing settings file at {FullPath}.", fullPath);
                 File.Delete(fullPath);
             }
 
             File.Move(temporaryPath, fullPath);
+
+            _logger.LogInformation("Settings file {FileName} was saved successfully to {FullPath}.", fileName, fullPath);
         }
 
         private async Task<T?> LoadAsync<T>(
             string fileName,
-            CancellationToken cancellationToken)
+            CancellationToken cancellationToken) where T : BaseConfig
         {
             if (string.IsNullOrWhiteSpace(fileName))
             {
@@ -102,31 +410,49 @@ namespace AlayaCore.Services
 
             if (!File.Exists(fullPath))
             {
+                _logger.LogInformation("Settings file {FileName} was not found at {FullPath}.", fileName, fullPath);
                 return default;
             }
 
+            _logger.LogDebug("Loading settings file {FileName} from {FullPath}.", fileName, fullPath);
+
             string json = await File.ReadAllTextAsync(fullPath, cancellationToken).ConfigureAwait(false);
 
             if (string.IsNullOrWhiteSpace(json))
             {
+                _logger.LogWarning("Settings file {FileName} at {FullPath} was empty.", fileName, fullPath);
                 return default;
             }
 
             try
             {
-                return JsonConvert.DeserializeObject<T>(json);
+                T? result = JsonConvert.DeserializeObject<T>(json);
+
+                if (result == null)
+                {
+                    _logger.LogWarning("Deserializing settings file {FileName} at {FullPath} returned null.", fileName, fullPath);
+                }
+                else
+                {
+                    _logger.LogDebug("Settings file {FileName} was deserialized successfully.", fileName);
+                }
+
+                return result;
             }
             catch (JsonException ex)
             {
+                _logger.LogError(ex, "Failed to deserialize settings file {FileName} at {FullPath} to {TypeName}.", fileName, fullPath, typeof(T).Name);
                 throw new InvalidDataException(
                     $"Failed to deserialize settings file '{fullPath}' to {typeof(T).Name}.",
                     ex);
             }
         }
 
-        private static string GetFullPath(string fileName)
+        private string GetFullPath(string fileName)
         {
-            return Path.Combine(AppContext.BaseDirectory, "Config", fileName);
+            string fullPath = Path.Combine(_fileStore.GetOrCreate(FolderLocation.Config), fileName);
+            _logger.LogDebug("Resolved settings file path for {FileName} to {FullPath}.", fileName, fullPath);
+            return fullPath;
         }
     }
 }

AlayaCore/States/LaunchPlan.cs

@@ -2,9 +2,10 @@ namespace AlayaCore.States
 {
     public enum LaunchState
     {
+        Checking,
         Ready,
         LauncherNeedsUpdate,
-        InstallJava,
+        NeedAuthenticating,
         InstallMinecraft,
         InstallNeoforge,
         SyncMods
@@ -13,41 +14,45 @@ namespace AlayaCore.States
     public sealed class LaunchPlan
     {
         public bool LauncherNeedsUpdate { get; }
-        public bool JavaNeedsInstallOrUpdate { get; }
         public bool MinecraftNeedsInstallOrUpdate { get; }
         public bool NeoforgeNeedsInstallOrUpdate { get; }
         public bool ModsNeedSync { get; }
+        public bool NeedAuthenticating { get; }
 
         public LaunchState State => ComputeState();
 
-        public bool CanRun =>
+        public bool CanRun => State == LaunchState.Ready;
-            State == LaunchState.Ready;
 
         public bool NeedsUpdating =>
-            State != LaunchState.Ready;
+            LauncherNeedsUpdate ||
+            MinecraftNeedsInstallOrUpdate ||
+            NeoforgeNeedsInstallOrUpdate ||
+            ModsNeedSync;
+
+        public bool NeedsAttention =>
+            NeedsUpdating || NeedAuthenticating;
 
         public LaunchPlan(
             bool launcherNeedsUpdate,
-            bool javaNeedsInstallOrUpdate,
             bool minecraftNeedsInstallOrUpdate,
             bool neoforgeNeedsInstallOrUpdate,
-            bool modsNeedSync)
+            bool modsNeedSync,
+            bool needAuthenticating)
         {
             LauncherNeedsUpdate = launcherNeedsUpdate;
-            JavaNeedsInstallOrUpdate = javaNeedsInstallOrUpdate;
             MinecraftNeedsInstallOrUpdate = minecraftNeedsInstallOrUpdate;
             NeoforgeNeedsInstallOrUpdate = neoforgeNeedsInstallOrUpdate;
             ModsNeedSync = modsNeedSync;
+            NeedAuthenticating = needAuthenticating;
         }
 
         private LaunchState ComputeState()
         {
-            // Priority order matters a LOT here
             if (LauncherNeedsUpdate)
                 return LaunchState.LauncherNeedsUpdate;
 
-            if (JavaNeedsInstallOrUpdate)
+            if (NeedAuthenticating)
-                return LaunchState.InstallJava;
+                return LaunchState.NeedAuthenticating;
 
             if (MinecraftNeedsInstallOrUpdate)
                 return LaunchState.InstallMinecraft;
@@ -65,10 +70,10 @@ namespace AlayaCore.States
         {
             return new LaunchPlan(
                 launcherNeedsUpdate: false,
-                javaNeedsInstallOrUpdate: false,
                 minecraftNeedsInstallOrUpdate: false,
                 neoforgeNeedsInstallOrUpdate: false,
-                modsNeedSync: false);
+                modsNeedSync: false,
+                needAuthenticating: false);
         }
     }
 }

AlayaCore/Utilities/Converters/UriConverter.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Globalization;
 using Newtonsoft.Json;
 
 namespace AlayaCore.Utilities.Converters
@@ -12,9 +11,9 @@ namespace AlayaCore.Utilities.Converters
             {
                 writer.WriteNull();
             }
-            else if (value is Uri)
+            else if (value is Uri uri)
             {
-                writer.WriteValue(((Uri)value).AbsoluteUri);
+                writer.WriteValue(uri.AbsoluteUri);
             }
             else
             {
@@ -33,8 +32,7 @@ namespace AlayaCore.Utilities.Converters
             {
                 try
                 {
-                    Uri uri = new Uri((string)reader.Value!);
+                    return new Uri((string)reader.Value!, UriKind.Absolute);
-                    return uri;
                 }
                 catch (Exception ex)
                 {
@@ -47,7 +45,7 @@ namespace AlayaCore.Utilities.Converters
 
         public override bool CanConvert(Type objectType)
         {
-            return objectType == typeof(Uri);
+            return typeof(Uri).IsAssignableFrom(objectType);
         }
     }
 }

AlayaCore/Utilities/Enums/FolderLocation.cs

@@ -0,0 +1,17 @@
+namespace AlayaCore.Utilities.Enums
+{
+    public enum FolderLocation
+    {
+        BaseDirectory,
+        Java,
+        JavaRuntime,
+        Game,
+        Mods,
+        ResourcePacks,
+        Config,
+        Downloads,
+        Manifests,
+        Plugins,
+        Data
+    }
+}

AlayaCore/Utilities/Enums/LauncherErrorType.cs

@@ -0,0 +1,16 @@
+namespace AlayaCore.Utilities.Enums
+{
+    public enum LauncherErrorType
+    {
+        Unknown,
+        Network,
+        Manifest,
+        Authentication,
+        Download,
+        Installation,
+        Update,
+        Launch,
+        Configuration,
+        Cancelled
+    }
+}

AlayaCore/Utilities/Extensions/MappingExtensions.cs

@@ -47,12 +47,10 @@ namespace AlayaCore.Utilities.Extensions
 
             return new ManifestModel(
                 dto.AlayaVersion,
-                dto.RequiredJavaVersion,
-                dto.RequiredJavaUrl,
                 dto.MinecraftVersion,
-                dto.MinecraftUrl,
                 dto.NeoforgedVersion,
-                dto.NeoforgedUrl,
+                dto.ServerUrl,
+                dto.ServerPort,
                 dto.Files?.Select(file => file.ToModel()) ?? Array.Empty<ModFileEntry>());
         }
 
@@ -80,12 +78,8 @@ namespace AlayaCore.Utilities.Extensions
             return new ManifestDto
             {
                 AlayaVersion = model.AlayaVersion,
-                RequiredJavaVersion = model.RequiredJavaVersion,
-                RequiredJavaUrl = model.RequiredJavaUrl,
                 MinecraftVersion = model.MinecraftVersion,
-                MinecraftUrl = model.MinecraftUrl,
                 NeoforgedVersion = model.NeoforgedVersion,
-                NeoforgedUrl = model.NeoforgedUrl,
                 Files = model.Files.Select(file => file.ToDto()).ToList()
             };
         }

AlayaCore/Utilities/Helpers/ErrorHelper.cs

@@ -0,0 +1,56 @@
+using System;
+using System.IO;
+using System.Net.Http;
+using AlayaCore.Utilities.Enums;
+
+namespace AlayaCore.Errors
+{
+    public static class ErrorHelper
+    {
+        public static LauncherError Map(Exception exception)
+        {
+            if (exception == null)
+            {
+                throw new ArgumentNullException(nameof(exception));
+            }
+
+            return exception switch
+            {
+                OperationCanceledException => new LauncherError(
+                    LauncherErrorType.Cancelled,
+                    "The operation was cancelled.",
+                    exception),
+
+                HttpRequestException => new LauncherError(
+                    LauncherErrorType.Network,
+                    "A network error occurred.",
+                    exception),
+
+                IOException => new LauncherError(
+                    LauncherErrorType.Network,
+                    "A file or network I/O error occurred.",
+                    exception),
+
+                InvalidDataException => new LauncherError(
+                    LauncherErrorType.Manifest,
+                    "Invalid or corrupt data was encountered.",
+                    exception),
+
+                ArgumentException => new LauncherError(
+                    LauncherErrorType.Configuration,
+                    "Invalid configuration or input.",
+                    exception),
+
+                InvalidOperationException => new LauncherError(
+                    LauncherErrorType.Launch,
+                    "The operation could not be completed due to an invalid state.",
+                    exception),
+
+                _ => new LauncherError(
+                    LauncherErrorType.Unknown,
+                    "An unexpected error occurred.",
+                    exception)
+            };
+        }
+    }
+}

AlayaCore/Utilities/Helpers/OptionsHelper.cs

@@ -0,0 +1,21 @@
+using AlayaCore.Models.Configuration;
+
+namespace AlayaCore.Utilities.Helpers
+{
+    public static class OptionsHelper
+    {
+        public static (LauncherUpdateServiceOptions LaunchUpdater, LauncherOptions Launcher,
+            GameOptions Game, ManifestServiceOptions Manifest, ModrinthConnectionOptions Modrinth,
+            RetryPolicyOptions RetryPolicy) GetDefaultOptions()
+        {
+            LauncherUpdateServiceOptions lso = LauncherUpdateServiceOptions.Default;
+            LauncherOptions lo = LauncherOptions.Default;
+            GameOptions go = GameOptions.Default;
+            ManifestServiceOptions mso = ManifestServiceOptions.Default;
+            ModrinthConnectionOptions mco = ModrinthConnectionOptions.Default;
+            RetryPolicyOptions rpo = RetryPolicyOptions.Default;
+
+            return (lso, lo, go, mso, mco, rpo);
+        }
+    }
+}

AlayaCore/Utilities/Stores/LocalFileStore.cs

@@ -0,0 +1,111 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using AlayaCore.Abstractions.Interfaces;
+using AlayaCore.Utilities.Enums;
+
+namespace AlayaCore.Utilities.Stores
+{
+    public sealed class LocalFileStore : IFileStore
+    {
+        private static readonly string BaseDirectoryPath = AppContext.BaseDirectory;
+        private static readonly string JavaDirectoryPath = Path.Combine(BaseDirectoryPath, "Java");
+        private static readonly string JavaRuntimeDirectoryPath = Path.Combine(JavaDirectoryPath, "runtime");
+        private static readonly string GameDirectoryPath = Path.Combine(BaseDirectoryPath, "Game");
+        private static readonly string ModsDirectoryPath = Path.Combine(GameDirectoryPath, "mods");
+        private static readonly string ResourcePacksDirectoryPath = Path.Combine(GameDirectoryPath, "resourcepacks");
+        private static readonly string ConfigDirectoryPath = Path.Combine(BaseDirectoryPath, "Config");
+        private static readonly string DownloadsDirectoryPath = Path.Combine(BaseDirectoryPath, "Temp");
+        private static readonly string ManifestsDirectoryPath = Path.Combine(BaseDirectoryPath, "Manifests");
+        private static readonly string PluginsDirectoryPath = Path.Combine(GameDirectoryPath, "plugins");
+        private static readonly string DataDirectoryPath = Path.Combine(BaseDirectoryPath, "Data");
+
+        private static readonly IReadOnlyDictionary<FolderLocation, string> Folders =
+            new Dictionary<FolderLocation, string>
+            {
+                { FolderLocation.BaseDirectory, BaseDirectoryPath },
+                { FolderLocation.Java, JavaDirectoryPath },
+                { FolderLocation.JavaRuntime, JavaRuntimeDirectoryPath },
+                { FolderLocation.Game, GameDirectoryPath },
+                { FolderLocation.Mods, ModsDirectoryPath },
+                { FolderLocation.ResourcePacks, ResourcePacksDirectoryPath },
+                { FolderLocation.Config, ConfigDirectoryPath },
+                { FolderLocation.Downloads, DownloadsDirectoryPath },
+                { FolderLocation.Manifests, ManifestsDirectoryPath},
+                { FolderLocation.Plugins, PluginsDirectoryPath },
+                { FolderLocation.Data, DataDirectoryPath}
+            };
+
+        public LocalFileStore()
+        {
+            CreateDirectories();
+        }
+
+        public void CreateDirectories()
+        {
+            Directory.CreateDirectory(BaseDirectoryPath);
+            Directory.CreateDirectory(JavaDirectoryPath);
+            Directory.CreateDirectory(JavaRuntimeDirectoryPath);
+            Directory.CreateDirectory(GameDirectoryPath);
+            Directory.CreateDirectory(ModsDirectoryPath);
+            Directory.CreateDirectory(ResourcePacksDirectoryPath);
+            Directory.CreateDirectory(ConfigDirectoryPath);
+            Directory.CreateDirectory(DownloadsDirectoryPath);
+            Directory.CreateDirectory(ManifestsDirectoryPath);
+            Directory.CreateDirectory(PluginsDirectoryPath);
+            Directory.CreateDirectory(DataDirectoryPath);
+        }
+
+        public string Get(FolderLocation location)
+        {
+            if (!Folders.TryGetValue(location, out string? path))
+            {
+                throw new ArgumentOutOfRangeException(nameof(location), location, "Unknown folder location.");
+            }
+
+            return path;
+        }
+
+        public string GetOrCreate(FolderLocation location)
+        {
+            string path = Get(location);
+            Directory.CreateDirectory(path);
+            return path;
+        }
+
+        public string Combine(FolderLocation location, params string[] paths)
+        {
+            if (paths == null)
+            {
+                throw new ArgumentNullException(nameof(paths));
+            }
+
+            string rootPath = Get(location);
+
+            if (paths.Length == 0)
+            {
+                return rootPath;
+            }
+
+            string[] combinedPaths = new string[paths.Length + 1];
+            combinedPaths[0] = rootPath;
+
+            for (int i = 0; i < paths.Length; i++)
+            {
+                if (string.IsNullOrWhiteSpace(paths[i]))
+                {
+                    throw new ArgumentException("Path segments cannot be null, empty, or whitespace.", nameof(paths));
+                }
+
+                combinedPaths[i + 1] = paths[i];
+            }
+
+            return Path.Combine(combinedPaths);
+        }
+
+        public bool Exists(FolderLocation location)
+        {
+            return Directory.Exists(Get(location));
+        }
+    }
+}

AlayaCore/obj/AlayaCore.csproj.nuget.dgspec.json

@@ -44,9 +44,25 @@
         "netstandard2.1": {
           "targetAlias": "netstandard2.1",
           "dependencies": {
+            "CmlLib.Core": {
+              "target": "Package",
+              "version": "[4.0.6, )"
+            },
+            "CmlLib.Core.Auth.Microsoft": {
+              "target": "Package",
+              "version": "[3.3.1, )"
+            },
+            "CmlLib.Core.Installer.NeoForge": {
+              "target": "Package",
+              "version": "[4.0.0, )"
+            },
             "Newtonsoft.Json": {
               "target": "Package",
               "version": "[13.0.4, )"
+            },
+            "XboxAuthNet.Game.Msal": {
+              "target": "Package",
+              "version": "[0.1.3, )"
             }
           },
           "imports": [

AlayaCore/obj/AlayaCore.csproj.nuget.g.targets

@@ -1,2 +1,7 @@
 <?xml version="1.0" encoding="utf-8" standalone="no"?>
-<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" />
+<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ImportGroup Condition=" '$(ExcludeRestorePackageImports)' != 'true' ">
+    <Import Project="$(NuGetPackageRoot)system.text.json/8.0.5/buildTransitive/netstandard2.0/System.Text.Json.targets" Condition="Exists('$(NuGetPackageRoot)system.text.json/8.0.5/buildTransitive/netstandard2.0/System.Text.Json.targets')" />
+    <Import Project="$(NuGetPackageRoot)microsoft.extensions.logging.abstractions/8.0.1/buildTransitive/netstandard2.0/Microsoft.Extensions.Logging.Abstractions.targets" Condition="Exists('$(NuGetPackageRoot)microsoft.extensions.logging.abstractions/8.0.1/buildTransitive/netstandard2.0/Microsoft.Extensions.Logging.Abstractions.targets')" />
+  </ImportGroup>
+</Project>

AlayaCore/obj/Debug/netstandard2.1/AlayaCore.AssemblyInfo.cs

@@ -13,7 +13,7 @@ using System.Reflection;
 [assembly: System.Reflection.AssemblyCompanyAttribute("AlayaCore")]
 [assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
 [assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
-[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+823ccf4b877ddf1fc1293f72c6b704d6a449ddaa")]
 [assembly: System.Reflection.AssemblyProductAttribute("AlayaCore")]
 [assembly: System.Reflection.AssemblyTitleAttribute("AlayaCore")]
 [assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]

AlayaCore/obj/Debug/netstandard2.1/AlayaCore.AssemblyInfoInputs.cache

@@ -1 +1 @@
-02d72db7e7301cd87568f68f39a003b2484df3c699c3ceed1d9bd04f25f6e3dd
+c63b3bf6f0fd998ece1d911c58e61eb584840e2e19d535b62f67f54b1510e49e

AlayaCore/obj/project.nuget.cache

@@ -1,10 +1,40 @@
 {
   "version": 2,
-  "dgSpecHash": "iqHG7z//q/I=",
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