using System;
using DG.Tweening;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

namespace AibisDream
{
    [RequireComponent(typeof(Collider2D))]
    public class SpriteButton : MonoBehaviour, IPointerDownHandler, IPointerEnterHandler, IPointerExitHandler, IPointerUpHandler
    {
        [SerializeField] private SpriteRenderer spriteRenderer;
        [SerializeField] private ColorBlock colorBlock;
        public event Action OnClicked;

        private bool _isPointerInside;
        private bool _isPointerDown;
        private bool _hasSelection;
        // private bool _isInteractable;

        private SelectionType CurrentSelectionType
        {
            get
            {
                // if (!_isInteractable)
                //     return SelectionType.Disabled;
                if (_isPointerDown)
                    return SelectionType.Pressed;
                if (_isPointerInside)
                    return SelectionType.Highlighted;
                return SelectionType.Normal;
            }
        }

        // public bool IsInteractive
        // {
        //     get => _isInteractable;
        //     set
        //     {
        //         _isInteractable = value;
        //         DoStateTransition(CurrentSelectionType);
        //     }
        // }

        public void OnPointerDown(PointerEventData eventData)
        {
            if (eventData.button != PointerEventData.InputButton.Left)
                return;
            
            _isPointerDown = true;
            EvaluateAndTransitionToSelectionType();
            
            OnClicked?.Invoke();
        }
        
        public void OnPointerUp(PointerEventData eventData)
        {
            if (eventData.button != PointerEventData.InputButton.Left)
                return;

            _isPointerDown = false;
            EvaluateAndTransitionToSelectionType();
        }

        public void OnPointerEnter(PointerEventData eventData)
        {
            _isPointerInside = true;
            EvaluateAndTransitionToSelectionType();
        }

        public void OnPointerExit(PointerEventData eventData)
        {
            _isPointerInside = false;
            EvaluateAndTransitionToSelectionType();
        }

        private void EvaluateAndTransitionToSelectionType()
        {
            // if (!_isInteractable)
            //     return;

            DoStateTransition(CurrentSelectionType);
        }
        
        private void DoStateTransition(SelectionType selectionType)
        {
            if (!gameObject.activeInHierarchy)
                return;

            var tintColor = selectionType switch
            {
                SelectionType.Normal => colorBlock.normalColor,
                SelectionType.Highlighted => colorBlock.highlightedColor,
                SelectionType.Pressed => colorBlock.pressedColor,
                SelectionType.Selected => colorBlock.selectedColor,
                SelectionType.Disabled => colorBlock.disabledColor,
                _ => Color.black
            };

            // spriteRenderer.DOColor(tintColor, colorBlock.fadeDuration).SetUpdate(true);
            spriteRenderer.color = tintColor;
        }
    }
}