using DG.Tweening;
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Playables;
/*******************************************************************************
*Create By CG
*Function Timeline正播倒播辅助类
*******************************************************************************/
namespace CG.UTility
{
    [RequireComponent(typeof(PlayableDirector))]
    public class TimelineDirectorCtrl : MonoBehaviour
	{
        #region ENUM
        public enum Status
        {
            NULL,
            PLAYING,
            PAUSED,
            STOPPED,
        }

        public enum Direction
        {
            NULL,
            FORWARD,
            BACKWARD
        }

        #endregion

        [SerializeField]
        private PlayableDirector m_playableDirector;

        [Range(0f, 1f)]
        public float PlaySpeed = 1f;

        /// <summary>
        /// 播放模式
        /// </summary>
        public WrapMode WrapMode = WrapMode.Once;

        /// <summary>
        /// 开始播放事件, 返回时 时间点，和触发时方向
        /// </summary>
        public Action<double, Direction> OnPlay;

        /// <summary>
        /// 暂停播放事件, 返回时 时间点，和触发时方向
        /// </summary>
        public Action<double, Direction> OnPause;

        /// <summary>
        /// 停止播放事件, 返回时 时间点，和触发时方向
        /// </summary>
        public Action<double, Direction> OnStop;

        /// <summary>
        /// 继续播放事件, 返回时 时间点，和触发时方向
        /// </summary>
        public Action<double, Direction> OnContinue;

        /// <summary>
        /// Timeline长度
        /// </summary>
        public double Duration { get; private set; } = -1f;

        /// <summary>
        /// 当前播放状态(如果用不到可是删除，现在这个字段只是一个状态的记录)
        /// </summary>
        public Status CurrentPlayStatus { get; private set; } = Status.NULL;

        /// <summary>
        /// 当前播放方向(如果用不到可是删除，现在这个字段只是一个状态的记录)
        /// </summary>
        public Direction CurrentPlayDirection { get; private set; } = Direction.NULL;

        /// <summary>
        /// 当前播放进度
        /// </summary>
        public double CurrentTime { get; private set; } = 0d;

        private Tweener m_timeTween;

        private void Awake()
        {
            m_playableDirector = GetComponent<PlayableDirector>();
            m_playableDirector.playOnAwake = false;
            Duration = m_playableDirector.duration;
            CurrentPlayStatus = Status.STOPPED;
        }
        public void SetDuration()
        {
            Duration = m_playableDirector.duration;
        }
        /// <summary>
        /// 继续播放
        /// </summary>
        public void Continue()
        {
            OnContinue?.Invoke(CurrentTime, CurrentPlayDirection);
            CurrentPlayStatus = Status.PLAYING;
            CurrentPlayDirection = Direction.FORWARD;
            m_timeTween.Kill();
            RatioExecute(Duration);
        }

        /// <summary>
        /// 从暂停时间点正向播放到指定时间点, 应用在倒播中途暂停后切换为正播
        /// </summary>
        public void ContinuePlayForwardByPausePoint(double time,Action finishCall)
        {
            OnContinue?.Invoke(CurrentTime, CurrentPlayDirection);
            CurrentPlayStatus = Status.PLAYING;
            CurrentPlayDirection = Direction.FORWARD;
            m_timeTween.Kill();
            RatioExecute(time);
            m_timeTween.OnComplete(()=> { finishCall?.Invoke(); });
        }

        /// <summary>
        /// 从暂停时间点反向播放到指定时间点, 应用在正播中途暂停后切换为倒播
        /// </summary>
        public void ContinuePlayBackwardByPausePoint(double time, Action finishCall)
        {
            OnContinue?.Invoke(CurrentTime, CurrentPlayDirection);
            CurrentPlayStatus = Status.PLAYING;
            CurrentPlayDirection = Direction.BACKWARD;
            m_timeTween.Kill();
            RatioExecute(time);
            m_timeTween.OnComplete(() => { finishCall?.Invoke(); });
        }

        /// <summary>
        /// 从开始播放
        /// </summary>
        public void PlayForward()
        {
            OnPlay?.Invoke(CurrentTime, CurrentPlayDirection);

            m_timeTween.Kill();
            CurrentTime = 0d;
            RatioExecute(Duration);
        }

        /// <summary>
        /// 从结尾倒放
        /// </summary>
        public void PlayBackward()
        {
            OnPlay?.Invoke(CurrentTime, CurrentPlayDirection);

            m_timeTween.Kill();
            CurrentTime = Duration;
            RatioExecute(0);
        }

        /// <summary>
        /// 暂停播放
        /// </summary>
        public void Pause()
        {
            OnPause?.Invoke(CurrentTime, CurrentPlayDirection);

            m_timeTween.Pause();

        }
        /// <summary>
        /// 暂停在某个时间点
        /// </summary>
        public void StopInTime(double time)
        {
            m_timeTween.Kill();
            CurrentTime = time;
            m_playableDirector.time = CurrentTime;
            m_playableDirector.Evaluate();
        }

        /// <summary>
        /// 停止播放
        /// </summary>
        public void Stop()
        {
            OnStop?.Invoke(CurrentTime, CurrentPlayDirection);

            m_timeTween.Kill();
            CurrentTime = 0d;
            if (m_playableDirector)
            {
                m_playableDirector.time = CurrentTime;
                m_playableDirector.Evaluate();
            }
            DOTween.KillAll();
        }


        private void RatioExecute(double target)
        {
            // 使用DoTween最当前时间进行线性过渡
            m_timeTween = DOTween.To(() => CurrentTime, x => CurrentTime = x, target, PlaySpeed).SetSpeedBased().SetEase(Ease.Linear);
            // 做出限制避免bug
            CurrentTime = Clamp(CurrentTime, 0d, Duration);

            m_timeTween.OnUpdate(() =>
            {
                // 直接取样
                if (m_playableDirector != null)
                {
                    m_playableDirector.time = CurrentTime;
                    m_playableDirector.Evaluate();
                }
            });
            m_timeTween.Play();
        }

        /// <summary>
        /// 针对Double的Clamp
        /// </summary>
        public static double Clamp(double value, double min, double max)
        {
            if (value < min)
                value = min;
            else if (value > max)
                value = max;
            return value;
        }
    }
}