using System;
using BriarQueen.Data.Identifiers;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

namespace BriarQueen.UI.Codex
{
    [ExecuteAlways]
    public class CodexLocationButton : MonoBehaviour
    {
        private const float MIN_WIDTH = 300f;
        private const float MAX_WIDTH = 400f;
        private const float FIXED_HEIGHT = 70f;

        [SerializeField]
        private Button _button;

        [SerializeField]
        private TextMeshProUGUI _label;

        [SerializeField]
        private float _leftPadding = 24f;

        [SerializeField]
        private float _rightPadding = 24f;

        [SerializeField]
        private float _extraWidthSafety = 20f;

        [SerializeField]
        private float _autoSizeMinFontSize = 18f;

        [SerializeField]
        private bool _debugInEditor = true;

        private string _lastText;
        private float _lastWidth = -1f;

        public Location Location { get; private set; }

        private void Awake()
        {
            AddButtonListener();
            RefreshVisuals();
        }

#if UNITY_EDITOR
        private void Update()
        {
            if (Application.isPlaying)
                return;

            if (_label == null)
                return;

            if (_lastText != _label.text)
                RefreshVisuals();
        }
#endif

        private void OnEnable()
        {
            AddButtonListener();
            RefreshVisuals();
        }

        private void OnDestroy()
        {
            RemoveButtonListener();
        }

        private void OnValidate()
        {
            RefreshVisuals();
        }

        public event Action<Location> OnLocationClicked;

        public void Initialize(Location location, string displayText = null)
        {
            Location = location;

            if (_label != null)
                _label.text = string.IsNullOrWhiteSpace(displayText) ? location.ToString() : displayText;

            RefreshVisuals();
        }

        private void HandleClicked()
        {
            OnLocationClicked?.Invoke(Location);
        }

        private void RefreshVisuals()
        {
            ResizeToFitLabel();
        }

        private void ResizeToFitLabel()
        {
            if (_button == null || _label == null)
                return;

            var buttonRect = _button.GetComponent<RectTransform>();
            var labelRect = _label.rectTransform;

            if (buttonRect == null || labelRect == null)
                return;

            StretchLabelToButton(labelRect);

            _label.margin = new Vector4(_leftPadding, _label.margin.y, _rightPadding, _label.margin.w);
            _label.textWrappingMode = TextWrappingModes.NoWrap;
            _label.overflowMode = TextOverflowModes.Overflow;
            _label.enableAutoSizing = false;

            _label.ForceMeshUpdate();

            var preferredSize = _label.GetPreferredValues(_label.text, Mathf.Infinity, Mathf.Infinity);
            var desiredWidth = preferredSize.x + _leftPadding + _rightPadding + _extraWidthSafety;
            var targetWidth = Mathf.Clamp(desiredWidth, MIN_WIDTH, MAX_WIDTH);

            var needsAutoSizing = desiredWidth > MAX_WIDTH;

            if (needsAutoSizing)
            {
                _label.enableAutoSizing = true;
                _label.fontSizeMin = _autoSizeMinFontSize;
                _label.fontSizeMax = _label.fontSize;
                _label.overflowMode = TextOverflowModes.Truncate;
            }

            buttonRect.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, targetWidth);
            buttonRect.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, FIXED_HEIGHT);

#if UNITY_EDITOR
            if (_debugInEditor && (!Mathf.Approximately(targetWidth, _lastWidth) || _lastText != _label.text))
                Debug.Log(
                    $"[CodexLocationButton] '{_label.text}'\n" +
                    $"Preferred: {preferredSize.x:F1} | Desired: {desiredWidth:F1} | Final: {targetWidth:F1}\n" +
                    $"AutoSize: {needsAutoSizing}",
                    this);
#endif

            _lastText = _label.text;
            _lastWidth = targetWidth;

            LayoutRebuilder.ForceRebuildLayoutImmediate(buttonRect);
            _label.ForceMeshUpdate();
        }

        private void StretchLabelToButton(RectTransform labelRect)
        {
            labelRect.anchorMin = new Vector2(0f, 0f);
            labelRect.anchorMax = new Vector2(1f, 1f);
            labelRect.offsetMin = Vector2.zero;
            labelRect.offsetMax = Vector2.zero;
            labelRect.pivot = new Vector2(0.5f, 0.5f);
        }

        private void AddButtonListener()
        {
            if (_button == null)
                return;

            _button.onClick.RemoveListener(HandleClicked);
            _button.onClick.AddListener(HandleClicked);
        }

        private void RemoveButtonListener()
        {
            if (_button == null)
                return;

            _button.onClick.RemoveListener(HandleClicked);
        }
    }
}