using UnityEngine;
using System.Collections.Generic;
using DG.Tweening;
using UnityEngine.Rendering;

namespace AibisDream
{
    public class SpriteFlashSystem : MonoBehaviour
    {
        [Header("Sprite Flash Settings")]
        [SerializeField] private List<Sprite> spriteList = new List<Sprite>();
        [SerializeField] private List<Sprite> endingSpriteList = new List<Sprite>();
        [SerializeField] private SpriteRenderer targetSpriteRenderer;
        [SerializeField] private SpriteRenderer backupSpriteRenderer;
        [SerializeField] private float fadeDuration = 0.5f;
        [SerializeField] private float crossFadeDuration = 2f;
        [SerializeField] private UnityEngine.Rendering.Volume volume1;
        
        private Stack<Sprite> spriteStack;
        private Stack<Sprite> endingSpriteStack;
        private bool isFading = false;
        private bool isEndingMode = false;
        private DG.Tweening.Sequence currentSequence;
        private int currentEndingIndex = 0;

        private void Awake()
        {
            Debug.Log("SpriteFlashSystem Awake");
            // 初始化Sprite栈
            if (spriteList != null && spriteList.Count > 0)
            {
                spriteStack = new Stack<Sprite>(spriteList);
                Debug.Log($"初始化Sprite栈，共有{spriteStack.Count}个Sprite");
            }
            else
            {
                Debug.LogWarning("Sprite列表为空！");
            }

            // 初始化Ending Sprite栈
            if (endingSpriteList != null && endingSpriteList.Count > 0)
            {
                endingSpriteStack = new Stack<Sprite>(endingSpriteList);
                Debug.Log($"初始化Ending Sprite栈，共有{endingSpriteStack.Count}个Sprite");
            }
            else
            {
                Debug.LogWarning("Ending Sprite列表为空！");
            }

            // 确保SpriteRenderer初始状态正确
            if (targetSpriteRenderer != null)
            {
                targetSpriteRenderer.color = new Color(1f, 1f, 1f, 0f);
            }
            else
            {
                Debug.LogError("未设置目标SpriteRenderer！");
            }

            if (backupSpriteRenderer != null)
            {
                backupSpriteRenderer.color = new Color(1f, 1f, 1f, 0f);
            }
            else
            {
                Debug.LogError("未设置备用SpriteRenderer！");
            }
        }

        private void Update()
        {
            if (Input.GetKeyDown(KeyCode.Space))
            {
                Debug.Log("按下空格键");
                if (!isFading)
                {
                    if (!isEndingMode && spriteStack != null && spriteStack.Count > 0)
                    {
                        StartSpriteFlash();
                    }
                    else if (isEndingMode && endingSpriteStack != null && endingSpriteStack.Count > 0)
                    {
                        StartEndingCrossFade();
                    }
                }
                else
                {
                    Debug.Log($"无法开始闪烁：isFading={isFading}, spriteStack.Count={spriteStack?.Count ?? 0}");
                }
            }
        }

        private void StartSpriteFlash()
        {
            Debug.Log("开始Sprite闪烁");
            if (spriteStack.Count > 0)
            {
                isFading = true;
                var nextSprite = spriteStack.Pop();
                Debug.Log($"设置下一个Sprite: {nextSprite.name}");
                targetSpriteRenderer.sprite = nextSprite;
                targetSpriteRenderer.color = new Color(1f, 1f, 1f, 0f);

                // 创建新的序列
                currentSequence?.Kill();
                currentSequence = DOTween.Sequence();

                // 添加淡入效果
                currentSequence.Append(targetSpriteRenderer.DOFade(1f, fadeDuration).SetEase(Ease.InOutSine));
                if (volume1 != null)
                    currentSequence.Join(DOTween.To(() => volume1.weight, x => volume1.weight = x, 1f, fadeDuration).SetEase(Ease.InOutSine));

                // 添加淡出效果
                currentSequence.Append(targetSpriteRenderer.DOFade(0f, fadeDuration).SetEase(Ease.InOutSine));
                if (volume1 != null)
                    currentSequence.Join(DOTween.To(() => volume1.weight, x => volume1.weight = x, 0f, fadeDuration).SetEase(Ease.InOutSine));

                // 完成后重置状态
                currentSequence.OnComplete(() => {
                    Debug.Log("闪烁效果完成");
                    isFading = false;
                    currentSequence = null;

                    // 检查是否需要切换到ending模式
                    if (spriteStack.Count == 0 && endingSpriteStack != null && endingSpriteStack.Count > 0)
                    {
                        isEndingMode = true;
                        Debug.Log("切换到Ending模式");
                        // 显示第一张ending sprite
                        ShowNextEndingSprite();
                    }
                });
            }
        }

        private void ShowNextEndingSprite()
        {
            if (endingSpriteStack.Count > 0)
            {
                var nextSprite = endingSpriteStack.Pop();
                targetSpriteRenderer.sprite = nextSprite;
                targetSpriteRenderer.color = new Color(1f, 1f, 1f, 1f);
            }
        }

        private void StartEndingCrossFade()
        {
            if (endingSpriteStack.Count > 0)
            {
                isFading = true;
                var nextSprite = endingSpriteStack.Pop();
                
                // 设置备用渲染器的sprite
                backupSpriteRenderer.sprite = nextSprite;
                backupSpriteRenderer.color = new Color(1f, 1f, 1f, 0f);

                // 创建新的序列
                currentSequence?.Kill();
                currentSequence = DOTween.Sequence();

                // 当前sprite淡出，同时备用sprite淡入
                currentSequence.Join(targetSpriteRenderer.DOFade(0f, crossFadeDuration).SetEase(Ease.InOutSine));
                currentSequence.Join(backupSpriteRenderer.DOFade(1f, crossFadeDuration).SetEase(Ease.InOutSine));

                // 完成后交换两个渲染器的角色
                currentSequence.OnComplete(() => {
                    // 交换sprite
                    var tempSprite = targetSpriteRenderer.sprite;
                    targetSpriteRenderer.sprite = backupSpriteRenderer.sprite;
                    backupSpriteRenderer.sprite = tempSprite;

                    // 重置透明度
                    targetSpriteRenderer.color = new Color(1f, 1f, 1f, 1f);
                    backupSpriteRenderer.color = new Color(1f, 1f, 1f, 0f);

                    isFading = false;
                    currentSequence = null;
                });
            }
        }

        private void OnDestroy()
        {
            currentSequence?.Kill();
        }
    }
}