using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Playables;
using UnityEngine.AddressableAssets;

namespace AibisDream
{
    public class DirectorHandler : MonoBehaviour
    {
        public string timelineName;
        [SerializeField] private PlayableDirector director;
        [Header("多条Timeline")]
        [SerializeField] private AssetReference[] timelineList;
        
        private Dictionary<string, PlayableAsset> _timelineDict = new();
        private Action _onCompleteCallback;

#if UNITY_EDITOR
        /// <summary>
        /// 在 Editor 中，当组件创建或 Inspector 变化时自动查找同物体上的 PlayableDirector
        /// </summary>
        private void OnValidate()
        {
            if (director == null)
            {
                director = GetComponent<PlayableDirector>();
            }
        }
#endif

        private void Awake()
        {
            if (director == null)
            {
                director = GetComponent<PlayableDirector>();
            }

            // timelineList转字典

        }

        private void Start()
        {
            TimelineCenter.Instance.RegisterDirector(this);
        }

        private void OnDestroy()
        {
            TimelineCenter.Instance.UnregisterDirector(this);

            if (director != null)
            {
                director.stopped -= OnDirectorStopped;
            }
        }

        /// <summary>
        /// 播放 Timeline
        /// </summary>
        public void Play(Action onComplete = null)
        {
            if (director == null)
            {
                Debug.LogError($"DirectorHandler {timelineName}: PlayableDirector is null");
                return;
            }

            // 先停止再播放
            director.stopped -= OnDirectorStopped;
            if (director.state == PlayState.Playing)
            {
                director.Stop();
            }
                        
            _onCompleteCallback = onComplete;
            
            // 如果有完成回调，订阅 stopped 事件
            if (onComplete != null)
            {
                director.stopped += OnDirectorStopped;
            }
            
            director.Play();
        }

        /// <summary>
        /// 异步播放 Timeline（协程版本）
        /// </summary>
        public IEnumerator PlayAsync()
        {
            if (director == null)
            {
                Debug.LogError($"DirectorHandler {timelineName}: PlayableDirector is null");
                yield break;
            }

            // 先停止再播放
            if (director.state == PlayState.Playing)
            {
                director.Stop();
            }

            director.Play();
            
            // 等待播放完成
            while (director.state == PlayState.Playing)
            {
                yield return null;
            }
        }

        /// <summary>
        /// 停止播放
        /// </summary>
        public void Stop()
        {
            if (director == null) return;
            
            // 先取消事件订阅，避免 Stop() 触发回调
            director.stopped -= OnDirectorStopped;
            
            director.Stop();
            _onCompleteCallback = null;
        }

        /// <summary>
        /// 暂停播放
        /// </summary>
        public void Pause()
        {
            if (director == null) return;
            
            if (director.state == PlayState.Playing)
            {
                director.Pause();
            }
        }

        /// <summary>
        /// 恢复播放
        /// </summary>
        public void Resume()
        {
            if (director == null) return;
            
            if (director.state == PlayState.Paused)
            {
                director.Resume();
            }
        }

        /// <summary>
        /// 重置 Timeline
        /// </summary>
        public void Reset()
        {
            if (director == null) return;
            
            // 先取消事件订阅，避免 Stop() 触发回调
            director.stopped -= OnDirectorStopped;
            
            director.Stop();
            director.time = 0;
            director.Evaluate();
            
            _onCompleteCallback = null;
        }

        /// <summary>
        /// 获取当前播放时间
        /// </summary>
        public double GetPlaybackTime()
        {
            if (director == null) return 0;
            return director.time;
        }

        /// <summary>
        /// 获取总时长
        /// </summary>
        public double GetDuration()
        {
            if (director == null) return 0;
            return director.duration;
        }

        /// <summary>
        /// 设置播放速度
        /// </summary>
        public void SetPlaybackSpeed(float speed)
        {
            if (director == null) return;
            
            if (director.playableGraph.IsValid())
            {
                director.playableGraph.GetRootPlayable(0).SetSpeed(speed);
            }
            else
            {
                Debug.LogWarning($"DirectorHandler {timelineName}: PlayableGraph is not valid. Cannot set playback speed.");
            }
        }

        /// <summary>
        /// 跳转到指定时间点
        /// </summary>
        public void SeekToTime(double time)
        {
            if (director == null) return;
            
            director.time = Math.Clamp(time, 0, director.duration);
            director.Evaluate();
        }

        /// <summary>
        /// Director 停止事件处理
        /// </summary>
        private void OnDirectorStopped(PlayableDirector director)
        {
            // 立即取消订阅，避免重复触发
            director.stopped -= OnDirectorStopped;
            
            var callback = _onCompleteCallback;
            _onCompleteCallback = null;
            
            callback?.Invoke();
        }

        // /// <summary>
        // /// 对象销毁时清理事件订阅
        // /// </summary>
        // private void OnDestroy()
        // {
            
        // }
    }
}