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

namespace AibisDream
{
    public class SpriteFlashSystem : MonoBehaviour
    {
        [Header("References")]
         [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 bool isFading = false;
        private bool isEndingMode = false;
        private DG.Tweening.Sequence currentSequence;
        private int currentEndingIndex = 0;

        private void Awake()
        {
            // 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！");
            }
        }

        public IEnumerator TriggerFlash(string imagePath, float fadeDuration = 0.5f)
        {
            if (!isFading)
            {
                string fullPath = $"Assets/Resources/Art/CG/{imagePath}";
                Sprite flashSprite = Resources.Load<Sprite>($"Art/CG/{imagePath}");
                if (flashSprite != null)
                {
                    yield return StartFlash(flashSprite, fadeDuration);
                }
                else
                {
                    Debug.LogError($"无法加载闪回图片: {fullPath}");
                }
            }
            else
            {
                Debug.Log($"无法开始闪烁：isFading={isFading}");
            }
        }

        public void TriggerEnding(string imagePath,float fadeDuration=2f)
        {
            if (!isFading)
            {
                string fullPath = $"Assets/Resources/Art/CG/{imagePath}";
                Sprite endingSprite = Resources.Load<Sprite>($"Art/CG/{imagePath}");
                if (endingSprite != null)
                {
                    if (currentEndingIndex == 0)
                    {
                        // 第一张图片使用淡入效果
                        StartEndingFadeIn(endingSprite,fadeDuration);
                    }
                    else
                    {
                        // 后续图片使用交叉淡入淡出效果
                        StartEndingCrossFade(endingSprite,fadeDuration);
                    }
                    currentEndingIndex++;
                }
                else
                {
                    Debug.LogError($"无法加载结局图片: {fullPath}");
                }
            }
            else
            {
                Debug.Log($"无法开始闪烁：isFading={isFading}");
            }
        }

        private IEnumerator StartFlash(Sprite flashSprite, float fadeDuration = 0.5f)
        {
            Debug.Log("开始Sprite闪烁");
            isFading = true;
            targetSpriteRenderer.sprite = flashSprite;
            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));

            // 等待序列完成
            yield return currentSequence.WaitForCompletion();

            // 完成后重置状态
            Debug.Log("闪烁效果完成");
            isFading = false;
            currentSequence = null;
            DialogController.Instance.StartDialogNode("闪回完成");
        }

        private void StartEndingFadeIn(Sprite endingSprite,float fadeDuration=2f)
        {
            isFading = true;
            targetSpriteRenderer.sprite = endingSprite;
            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));

            // 完成后重置状态
            currentSequence.OnComplete(() => {
                isFading = false;
                currentSequence = null;
            });
        }

        private void StartEndingCrossFade(Sprite endingSprite,float crossFadeDuration=2f)
        {
            isFading = true;
            
            // 设置备用渲染器的sprite
            backupSpriteRenderer.sprite = endingSprite;
            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();
        }
    }
}