using PrimeTween;
using UnityEngine;
using UnityEngine.UI;

namespace BriarQueen.UI.Menus.Components
{
    public class SaveSlotHighlight : MonoBehaviour
    {
        [Header("Lines")]
        [SerializeField] private RectTransform _topLine;
        [SerializeField] private RectTransform _bottomLine;

        [Header("Colours")]
        [SerializeField] private Color _hoverColour    = new(0.65f, 0.10f, 0.10f, 0.5f);
        [SerializeField] private Color _selectedColour = new(0.65f, 0.10f, 0.10f, 1.0f);
        
        [Header("Tween")]
        [SerializeField] private float _duration       = 0.25f;
        [SerializeField] private Ease  _ease           = Ease.OutQuint;
        [SerializeField] private bool  _useUnscaledTime = true;

        private Image _topImage;
        private Image _bottomImage;
        private Tween _topTween;
        private Tween _bottomTween;
        private Tween _topColourTween;
        private Tween _bottomColourTween;

        private bool _isSelected;
        private bool _isHovered;

        private void Awake()
        {
            if (_topLine != null)    _topImage    = _topLine.GetComponent<Image>();
            if (_bottomLine != null) _bottomImage = _bottomLine.GetComponent<Image>();

            // Start fully scaled out on X
            SetScaleImmediate(0f);
            SetColourImmediate(Color.clear);
        }

        private void OnDestroy()
        {
            _topTween.Stop();
            _bottomTween.Stop();
            _topColourTween.Stop();
            _bottomColourTween.Stop();
        }

        // ── Public API ────────────────────────────────────────────────

        public void SetSelected(bool selected)
        {
            _isSelected = selected;
            RefreshState();
        }

        public void SetSelectedImmediate(bool selected)
        {
            _isSelected = selected;
            StopAllTweens();
            var (scale, colour) = ResolveTargetState();
            SetScaleImmediate(scale);
            SetColourImmediate(colour);
        }

        public void SetHovered(bool hovered)
        {
            _isHovered = hovered;
            RefreshState();
        }

        // ── Internal ──────────────────────────────────────────────────

        private void RefreshState()
        {
            var (scale, colour) = ResolveTargetState();
            TweenToScale(scale);
            TweenToColour(colour);
        }

        private (float scale, Color colour) ResolveTargetState()
        {
            if (_isSelected) return (1f, _selectedColour);
            if (_isHovered)  return (1f, _hoverColour);
            return (0f, Color.clear);
        }

        private void TweenToScale(float target)
        {
            _topTween.Stop();
            _bottomTween.Stop();

            var currentScale = _topLine != null
                ? _topLine.localScale.x
                : 0f;

            if (_topLine != null)
            {
                _topTween = Tween.ScaleX(
                    _topLine,
                    currentScale,
                    target,
                    _duration,
                    _ease,
                    useUnscaledTime: _useUnscaledTime);
            }

            if (_bottomLine != null)
            {
                _bottomTween = Tween.ScaleX(
                    _bottomLine,
                    currentScale,
                    target,
                    _duration,
                    _ease,
                    useUnscaledTime: _useUnscaledTime);
            }
        }

        private void TweenToColour(Color target)
        {
            _topColourTween.Stop();
            _bottomColourTween.Stop();

            if (_topImage != null)
            {
                _topColourTween = Tween.Color(
                    _topImage,
                    _topImage.color,
                    target,
                    _duration,
                    _ease,
                    useUnscaledTime: _useUnscaledTime);
            }

            if (_bottomImage != null)
            {
                _bottomColourTween = Tween.Color(
                    _bottomImage,
                    _bottomImage.color,
                    target,
                    _duration,
                    _ease,
                    useUnscaledTime: _useUnscaledTime);
            }
        }

        private void SetScaleImmediate(float scaleX)
        {
            if (_topLine != null)
                _topLine.localScale    = new Vector3(scaleX, 1f, 1f);
            if (_bottomLine != null)
                _bottomLine.localScale = new Vector3(scaleX, 1f, 1f);
        }

        private void SetColourImmediate(Color colour)
        {
            if (_topImage != null)    _topImage.color    = colour;
            if (_bottomImage != null) _bottomImage.color = colour;
        }

        private void StopAllTweens()
        {
            _topTween.Stop();
            _bottomTween.Stop();
            _topColourTween.Stop();
            _bottomColourTween.Stop();
        }
    }
}