using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Spine.Unity;
using Cysharp.Threading.Tasks;

/// <summary>
/// 角色动画基类，处理所有与动画相关的功能
/// </summary>
public class MotionBase
{
    public static List<string> AttackMotionList = new List<string>
    {
        MotionName.attack.ToString(),
        MotionName.angerSkill.ToString(),
        MotionName.passiveSkill.ToString(),
    };

    private Dictionary<Spine.TrackEntry, Action> trackEntryCompleteDict = new Dictionary<Spine.TrackEntry, Action>();

    // 动画事件
    public Action OnAttackAnimationComplete;
    public Action OnHitAnimationComplete;
    public Action<MotionName> onAnimationComplete;

    #region 组件引用
    
    protected SkeletonGraphic skeletonGraphic;
    protected Spine.AnimationState spineAnimationState;
    protected Spine.Skeleton skeleton;
    
    #endregion
    
    #region 动画设置
    
    // 动画混合时间
    protected float defaultMixDuration = 0f;
    
    #endregion

    private Spine.TrackEntry currentTrackEntry;

    #region 初始化方法
    
    /// <summary>
    /// 初始化动画组件
    /// </summary>
    /// <param name="skeletonGraphic">骨骼动画组件</param>
    public virtual void Init(SkeletonGraphic skeletonGraphic)
    {
        this.skeletonGraphic = skeletonGraphic;
        
        if (skeletonGraphic != null)
        {
            spineAnimationState = skeletonGraphic.AnimationState;
            skeleton = skeletonGraphic.Skeleton;
            
            // 设置动画混合时间
            if (spineAnimationState != null)
            {
                spineAnimationState.Data.DefaultMix = defaultMixDuration;
            }
            
            // 播放默认动画
            PlayAnimation(MotionName.idle, true);
            
            // 设置动画事件监听
            SetupAnimationHandlers();
        }
        else
        {
            Debug.LogError("缺少SkeletonGraphic组件!");
        }
    }
    
    public virtual void Release()
    {
        if (spineAnimationState != null)
        {
            spineAnimationState.Complete -= OnAnimationComplete;
            spineAnimationState.ClearTracks();
            spineAnimationState = null;
        }
        
        skeletonGraphic = null;
        skeleton = null;
        currentTrackEntry = null;
    }

    #endregion

    #region 动画控制

    /// <summary>
    /// 播放指定动画
    /// </summary>
    /// <param name="motionName">动画枚举</param>
    /// <param name="loop">是否循环</param>
    /// <param name="_onComplete">动画播放完成回调</param>
    /// <returns>动画轨道条目</returns>
    public virtual Spine.TrackEntry PlayAnimation(MotionName motionName, bool loop, Action _onComplete = null)
    {
        if (spineAnimationState == null) return null;

        // 如果当前动画未完成
        if (currentTrackEntry != null && !currentTrackEntry.IsComplete)
        {
            if (trackEntryCompleteDict.TryGetValue(currentTrackEntry, out var __onComplete))
            {
                __onComplete?.Invoke();
                trackEntryCompleteDict.Remove(currentTrackEntry);
            }
            currentTrackEntry = null;
        }

        // 直接使用 ToString() 而不是调用 GetAnimationName
        currentTrackEntry = spineAnimationState.SetAnimation(0, motionName.ToString(), loop);

        // 绑定回调
        if (_onComplete != null && currentTrackEntry != null)
        {
            trackEntryCompleteDict[currentTrackEntry] = _onComplete;
        }

        return currentTrackEntry;
    }

    public Spine.TrackEntry PlaySkillAnimation(SkillConfig skillConfig, Action onComplete = null, Action onBeginPhaseEnd = null, Action onActivePhaseEnd = null)
    {
        if (skillConfig == null)
        {
            Debug.LogError("技能配置为空，无法播放技能动画");
            return null;
        }

        return PlayAnimation(skillConfig.SkillMotionName, skillConfig.StartupFrames, skillConfig.ActiveFrames, skillConfig.LoopCount,
            onComplete, onBeginPhaseEnd, onActivePhaseEnd);
    }

    public virtual Spine.TrackEntry PlayAnimation(
            string animationName,
            int loopBeginFrame,
            int loopEndFrame,
            int loopTimes,
            Action _onComplete = null,
            Action onBeginPhaseEnd = null,    // 前摇结束回调
            Action onActivePhaseEnd = null    // 中摇结束回调
        )
    {
        if (spineAnimationState == null || skeleton == null) return null;

        var anim = skeleton.Data.FindAnimation(animationName);
        if (anim == null) return null;

        float fps = BattleConst.skillMotionFps;
        float beginTime = loopBeginFrame / fps;
        float endTime = loopEndFrame / fps;

        currentTrackEntry = spineAnimationState.SetAnimation(0, anim, false);

        int curLoop = 0;
        bool finished = false;
        bool beginPhaseTriggered = false;

        Spine.Unity.UpdateBonesDelegate updateLocalHandler = null;
        updateLocalHandler = (ISkeletonAnimation animated) =>
        {
            if (finished) return;
            var entry = currentTrackEntry;
            if (entry == null || entry.Animation != anim)
            {
                skeletonGraphic.UpdateLocal -= updateLocalHandler;
                return;
            }

            // 前摇结束（只触发一次）
            if (!beginPhaseTriggered && entry.TrackTime >= beginTime)
            {
                beginPhaseTriggered = true;
                onBeginPhaseEnd?.Invoke();
            }

            // 中摇结束（每次到endTime都触发）
            if (entry.TrackTime >= endTime)
            {
                onActivePhaseEnd?.Invoke();

                curLoop++;
                if (curLoop >= loopTimes)
                {
                    finished = true;
                    skeletonGraphic.UpdateLocal -= updateLocalHandler;
                    _onComplete?.Invoke();
                    return;
                }
                entry.TrackTime = beginTime;
                beginPhaseTriggered = false; // 重置，下一轮前摇可再次触发
            }
        };
        skeletonGraphic.UpdateLocal += updateLocalHandler;

        if (_onComplete != null && currentTrackEntry != null)
        {
            trackEntryCompleteDict[currentTrackEntry] = _onComplete;
        }

        return currentTrackEntry;
    }
    
    
    /// <summary>
    /// 设置动画事件监听
    /// </summary>
    protected virtual void SetupAnimationHandlers()
    {
        if (spineAnimationState == null) return;

        // 监听动画完成事件
        spineAnimationState.Complete += OnAnimationComplete;
    }

    /// <summary>
    /// 动画完成事件处理
    /// </summary>
    protected virtual void OnAnimationComplete(Spine.TrackEntry trackEntry)
    {
        string animation = trackEntry.Animation.Name;

        // 攻击动画完成后恢复到待机状态
        if (AttackMotionList.Contains(animation))
        {
            OnAttackAnimationComplete?.Invoke();
            PlayAnimation(MotionName.idle, true);
        }
        // 受伤动画完成后恢复到待机状态 可能触发多次 因为有多段攻击的存在
        else if (animation == MotionName.hit.ToString())
        {
            OnHitAnimationComplete?.Invoke();
            PlayAnimation(MotionName.idle, true);
        }
        onAnimationComplete?.Invoke((MotionName)Enum.Parse(typeof(MotionName), animation));
        
        // 只调用本次TrackEntry的回调
        if (trackEntryCompleteDict.TryGetValue(trackEntry, out var cb))
        {
            cb?.Invoke();
            trackEntryCompleteDict.Remove(trackEntry);
        }
    }


    public void Test(string animationName, int beginFrame, int activeFrame, int endFrame, int activeFrameLoopCount)
    {
        // 要处理前摇beginFrame 后摇endFrame 中摇activeFrame

        // 中摇是有多次的activeFrameLoopCount

        var state = spineAnimationState;
        var anim = skeleton.Data.FindAnimation(animationName);

        // 设定你要循环的区间（单位：秒）
        float loopStart = 0.5f;
        float loopEnd = 1.2f;

        // 播放动画
        state.SetAnimation(0, anim, true);
        // state.GetCurrent(0).TrackTime = loopStart;

        int curFrame = 0;

        skeletonGraphic.UpdateLocal += (skeletonAnim) =>
        {
            // if (curFrame == beginFrame)
            // {
            //     OnBeginFrame?.Invoke();
            // }
            // else if (curFrame == activeFrame)
            // {
            //     OnActiveFrame?.Invoke();
            // }
            // else if (curFrame == endFrame)
            // {
            //     OnEndFrame?.Invoke();
            // }
            // var trackEntry = state.GetCurrent(0);
            // if (trackEntry != null && trackEntry.Animation == anim)
            // {
            //     if (trackEntry.TrackTime > loopEnd)
            //     {
            //         // 回到loopStart，实现区间循环
            //         trackEntry.TrackTime = loopStart;
            //     }
            // }
        };
    }


    public virtual void Run()
    {

    }

    public virtual void Pause()
    {
        if (currentTrackEntry != null)
            currentTrackEntry.TimeScale = 0f;
    }

    public virtual void Resume()
    {
        if (currentTrackEntry != null)
            currentTrackEntry.TimeScale = 1f;
    }

    #endregion
    
}