using System;
using System.Collections;
using System.Collections.Generic;
using AibisDream.Kit;
using AibisDream.SaveSystem;
using UnityEngine;

namespace AibisDream
{
    public class TimelineCenter : SingletonBase<TimelineCenter>, ITimelineCenter
    {
        private readonly Dictionary<string, DirectorHandler> _timelineDict = new();

        /// <summary>
        /// 私有构造函数，供单例工具使用
        /// </summary>
        private TimelineCenter() { }

        public void RegisterDirector(DirectorHandler directorHandler)
        {
            _timelineDict.Add(directorHandler.timelineName, directorHandler);
        }

        public void UnregisterDirector(DirectorHandler directorHandler)
        {
            _timelineDict.Remove(directorHandler.timelineName);
        }

        /// <summary>
        /// 解析 timelineName，返回 (directorName, addressableKey 或 null)
        /// 格式：仅 DirectorName 或 DirectorName/AddressableKey
        /// </summary>
        private static (string directorName, string addressableKey) ParseTimelineName(string timelineName)
        {
            var idx = timelineName.IndexOf('/');
            if (idx < 0)
                return (timelineName, null);
            return (timelineName.Substring(0, idx), timelineName.Substring(idx + 1));
        }

        // -------------------------- 播放控制 --------------------------

        /// <summary>
        /// 播放 Timeline。timelineName 支持两种格式：仅 DirectorName（播放自带）或 DirectorName/AddressableKey（从 Addressables 加载播放）
        /// </summary>
        public void PlayTimeline(string timelineName)
        {
            var (directorName, addressableKey) = ParseTimelineName(timelineName);

            if (!_timelineDict.TryGetValue(directorName, out var directorHandler))
            {
                Debug.LogError($"Timeline {timelineName} not found (directorName: {directorName})");
                return;
            }

            directorHandler.gameObject.SetActive(true);

            if (addressableKey == null)
            {
                directorHandler.Play();
            }
            else
            {
                directorHandler.PlayFromAddressable(addressableKey);
            }
        }

        public IEnumerator PlayTimelineAsync(string name)
        {
            var (directorName, addressableKey) = ParseTimelineName(name);

            if (!_timelineDict.TryGetValue(directorName, out var directorHandler))
            {
                Debug.LogError($"Timeline {name} not found (directorName: {directorName})");
                yield break;
            }

            directorHandler.gameObject.SetActive(true);

            if (addressableKey == null)
            {
                yield return directorHandler.PlayAsync();
            }
            else
            {
                yield return directorHandler.PlayFromAddressableAsync(addressableKey);
            }
        }

        public void StopTimeline(string timelineName)
        {
            var (directorName, _) = ParseTimelineName(timelineName);
            if (!_timelineDict.TryGetValue(directorName, out var directorHandler))
            {
                Debug.LogError($"Timeline {timelineName} not found (directorName: {directorName})");
                return;
            }

            directorHandler.Stop();
        }

        public void PauseTimeline(string timelineName)
        {
            var (directorName, _) = ParseTimelineName(timelineName);
            if (!_timelineDict.TryGetValue(directorName, out var directorHandler))
            {
                Debug.LogError($"Timeline {timelineName} not found (directorName: {directorName})");
                return;
            }

            directorHandler.Pause();
        }

        public void ResumeTimeline(string timelineName)
        {
            var (directorName, _) = ParseTimelineName(timelineName);
            if (!_timelineDict.TryGetValue(directorName, out var directorHandler))
            {
                Debug.LogError($"Timeline {timelineName} not found (directorName: {directorName})");
                return;
            }

            directorHandler.Resume();
        }

        public void ResetTimeline(string timelineName)
        {
            var (directorName, _) = ParseTimelineName(timelineName);
            if (!_timelineDict.TryGetValue(directorName, out var directorHandler))
            {
                Debug.LogError($"Timeline {timelineName} not found (directorName: {directorName})");
                return;
            }

            directorHandler.Reset();
        }

        public void HideTimeline(string timelineName)
        {
            var (directorName, _) = ParseTimelineName(timelineName);
            if (!_timelineDict.TryGetValue(directorName, out var directorHandler))
            {
                Debug.LogError($"Timeline {timelineName} not found (directorName: {directorName})");
                return;
            }

            directorHandler.gameObject.SetActive(false);
        }

        #region 状态查询

        public double GetPlaybackTime(string name)
        {
            var (directorName, _) = ParseTimelineName(name);
            if (!_timelineDict.TryGetValue(directorName, out var directorHandler))
            {
                Debug.LogError($"Timeline {name} not found (directorName: {directorName})");
                return 0;
            }

            return directorHandler.GetPlaybackTime();
        }

        public double GetDuration(string name)
        {
            var (directorName, _) = ParseTimelineName(name);
            if (!_timelineDict.TryGetValue(directorName, out var directorHandler))
            {
                Debug.LogError($"Timeline {name} not found (directorName: {directorName})");
                return 0;
            }

            return directorHandler.GetDuration();
        }

        #endregion

        #region 扩展操作

        public void SetPlaybackSpeed(string name, float speed)
        {
            var (directorName, _) = ParseTimelineName(name);
            if (!_timelineDict.TryGetValue(directorName, out var directorHandler))
            {
                Debug.LogError($"Timeline {name} not found (directorName: {directorName})");
                return;
            }

            directorHandler.SetPlaybackSpeed(speed);
        }

        public void SeekToTime(string name, double time)
        {
            var (directorName, _) = ParseTimelineName(name);
            if (!_timelineDict.TryGetValue(directorName, out var directorHandler))
            {
                Debug.LogError($"Timeline {name} not found (directorName: {directorName})");
                return;
            }

            directorHandler.SeekToTime(time);
        }

        #endregion

        #region 批量操作

        public void PauseAll()
        {
            foreach (var directorHandler in _timelineDict.Values)
            {
                directorHandler.Pause();
            }
        }

        public void StopAll()
        {
            foreach (var directorHandler in _timelineDict.Values)
            {
                directorHandler.Stop();
            }
        }

        public void ResetAll()
        {
            foreach (var directorHandler in _timelineDict.Values)
            {
                directorHandler.Reset();
            }
        }

        #endregion

        public TimelineSnapshotDto CaptureSnapshot()
        {
            var dto = new TimelineSnapshotDto();
            foreach (var handler in _timelineDict.Values)
            {
                dto.entries.Add(handler.CaptureSnapshotEntry());
            }

            return dto;
        }

        public IEnumerator RestoreSnapshotAsync(TimelineSnapshotDto dto)
        {
            if (dto?.entries == null) yield break;

            foreach (var entry in dto.entries)
            {
                if (!_timelineDict.TryGetValue(entry.directorName, out var handler))
                {
                    continue;
                }

                yield return handler.RestoreSnapshotEntryAsync(entry);
            }
        }
    }

    public interface ITimelineCenter
    {
        void PlayTimeline(string timelineName);
        IEnumerator PlayTimelineAsync(string name);
        void StopTimeline(string timelineName);
        void PauseTimeline(string timelineName);
        void ResumeTimeline(string timelineName);
        void ResetTimeline(string timelineName);

        #region 状态查询

        /// <summary>
        /// 获取当前播放时间
        /// </summary>
        /// <param name="name">Timeline 名称</param>
        /// <returns>当前播放时间</returns>
        double GetPlaybackTime(string name);

        /// <summary>
        /// 获取总时长
        /// </summary>
        /// <param name="name">Timeline 名称</param>
        /// <returns>总时长</returns>
        double GetDuration(string name);

        #endregion

        #region 扩展操作

        /// <summary>
        /// 设置播放速度
        /// </summary>
        /// <param name="name">Timeline 名称</param>
        /// <param name="speed">播放速度</param>
        void SetPlaybackSpeed(string name, float speed);

        /// <summary>
        /// 跳转到指定时间点
        /// </summary>
        /// <param name="name">Timeline 名称</param>
        /// <param name="time">时间点（秒）</param>
        void SeekToTime(string name, double time);

        #endregion

        #region 批量操作

        /// <summary>
        /// 暂停所有 Timeline
        /// </summary>
        void PauseAll();

        /// <summary>
        /// 停止所有 Timeline
        /// </summary>
        void StopAll();

        /// <summary>
        /// 重置所有 Timeline
        /// </summary>
        void ResetAll();

        #endregion
    }
}