using System;
using System.Collections.Generic;
using System.Linq;
using Cysharp.Threading.Tasks;
using UnityEngine;

public class BattleEffectMgr
{
    private BattleField battleField;

    private Dictionary<int, List<BattleEffectPlayer>> effectDict = new Dictionary<int, List<BattleEffectPlayer>>();

    // 缓存Run()的临时列表，避免每帧分配
    private List<BattleEffectPlayer> _runList = new List<BattleEffectPlayer>();

    public void Init(BattleField _battleField)
    {
        Reload(_battleField);
    }

    public void Reload(BattleField _battleField)
    {
        Release();
        battleField = _battleField;
    }

    public void Run()
    {
        _runList.Clear();

        foreach (KeyValuePair<int, List<BattleEffectPlayer>> kvPair in effectDict)
        {
            _runList.AddRange(kvPair.Value);
        }

        for (int i = _runList.Count - 1; i >= 0; i--)
        {
            BattleEffectPlayer effectPlayer = _runList[i];
            if (effectPlayer != null)
            {
                effectPlayer.Run();
            }
        }
    }

    public void PauseGame()
    {
        foreach (KeyValuePair<int, List<BattleEffectPlayer>> kvPair in effectDict)
        {
            foreach (BattleEffectPlayer effectPlayer in kvPair.Value)
            {
                if (effectPlayer != null)
                {
                    effectPlayer.Pause();
                }
            }
        }
    }

    public void ResumeGame()
    {
        foreach (KeyValuePair<int, List<BattleEffectPlayer>> kvPair in effectDict)
        {
            foreach (BattleEffectPlayer effectPlayer in kvPair.Value)
            {
                if (effectPlayer != null)
                {
                    effectPlayer.Resume();
                }
            }
        }
    }

    public BattleEffectPlayer PlayEffect(BattleObject layerDepender, int effectId, Transform parent, BattleCamp camp, float _scaleRatio)
    {
        if (effectId <= 0)
        {
            Debug.LogError("effect id <= 0");
            return null;
        }

        var effectCfg = EffectConfig.Get(effectId);
        if (null == effectCfg)
        {
            Debug.LogError("effect config is null, effectId : " + effectId);
            return null;
        }

        if (!effectDict.ContainsKey(effectId))
        {
            effectDict[effectId] = new List<BattleEffectPlayer>();
        }

        bool isRedCamp = camp == BattleCamp.Red;

        BattleEffectPlayer effectPlayer = BattleEffectPlayer.Create(effectId, battleField, battleField.battleRootNode.transform, isRedCamp, _scaleRatio);
        // 设置特效缩放和方向

        effectPlayer.transform.position = parent.position;
        

        BattleObject temp = layerDepender;
        effectPlayer.onDestroy += (efPlayer) =>
        {
            OnEffectDestroy(efPlayer);
            temp.layerMgr.RemoveEffect(efPlayer);
        };

        if (effectPlayer != null)
        {
            effectDict[effectId].Add(effectPlayer);
        }
        effectPlayer.SetSpeedRatio(battleField.speedRatio);

        effectPlayer.Play(true).Forget();

        effectPlayer.SetScaleX(isRedCamp ? 1 : -1);

        
        // var effectScale = effectPlayer.transform.localScale;
        // effectScale.x *= isRedCamp ? 1 : -1;
        // effectPlayer.transform.localScale = effectScale;

        if (null != layerDepender)
        {
            layerDepender.layerMgr.AddEffect(effectPlayer);
        }

        return effectPlayer;
    }

    public void RemoveEffect(int effectId, BattleEffectPlayer effectPlayer)
    {
        List<BattleEffectPlayer> effectPlayers = null;

        if (effectDict.TryGetValue(effectId, out effectPlayers))
        {
            effectPlayers.Remove(effectPlayer);
            if (null == effectPlayer)
            {
                BattleDebug.LogError("effect player is null, effectid : " + effectId);
                return;
            }
            if (null != effectPlayer.gameObject)
            {
                GameObject.DestroyImmediate(effectPlayer.gameObject);
            }
            effectPlayer = null;
        }
        else
        {
            BattleDebug.LogError("could not find effect in list, effectid : " + effectId);
        }
    }

    protected void OnEffectDestroy(BattleEffectPlayer effectPlayer)
    {
        if (effectDict.ContainsKey(effectPlayer.effectId))
        {
            effectDict[effectPlayer.effectId].Remove(effectPlayer);
            if (effectDict[effectPlayer.effectId].Count == 0)
            {
                effectDict.Remove(effectPlayer.effectId);
            }
        }
    }

    public void HaveRest()
    {
        Release();
    }

    public void Release()
    {
        // 必须先快照key列表，因为DestroyImmediate会同步触发OnEffectDestroy修改effectDict
        _runList.Clear();
        var keys = new List<int>(effectDict.Keys);
        for (int k = 0; k < keys.Count; k++)
        {
            if (!effectDict.TryGetValue(keys[k], out var effectPlayers))
                continue;
            while (effectPlayers.Count > 0)
            {
                var effectPlayer = effectPlayers[0];
                if (effectPlayer != null)
                {
                    GameObject.DestroyImmediate(effectPlayer.gameObject);
                }
                else
                {
                    effectPlayers.RemoveAt(0);
                }
            }
        }

        effectDict.Clear();
    }

    public void SetSpeedRatio(float ratio)
    {
        foreach (var kvPair in effectDict)
        {
            foreach (var effectPlayer in kvPair.Value)
            {
                effectPlayer.SetSpeedRatio(ratio);
            }
        }
    }
}