using Entitas;
using System.Collections.Generic;
using UnityEngine;
using Game;
public class BuffSystem : IExecuteSystem, IInitializeSystem
{
    private IGroup<GameEntity> _entities;
    private List<string> _removeListTemp = new List<string>();
    public void Initialize()
    {
        _entities = Util.GetGroup(GameMatcher.Buff);
    }
    public void Execute()
    {
        foreach (var entity in _entities)
        {
            if (Util.IsPause(entity))
            {
                continue;
            }
            UpdateBuff(entity);//更新buff
        }
    }
    public void UpdateBuff(GameEntity entity)
    {
        var buff = entity.buff;
        _removeListTemp.Clear();
        foreach (var item in buff.BuffMap)
        {
            var buffItem = item.Value;
            var cfg = buffItem.BuffCfg;
            switch (buffItem.State)
            {
                case EState.Enter:
                    UtilBuff.BuffEffect(buffItem, EBuffEffectTimingType.LevelUp);
                    buffItem.State = EState.Update;
                    break;
                case EState.Update:
                    if (buffItem.TimeLeft.Value == -1)
                    {
                        //永久存在的buff
                        UtilBuff.BuffEffect(buffItem, EBuffEffectTimingType.During);
                        continue;
                    }
                    var timePast = Mathf.Min(Time.deltaTime, buffItem.TimeLeft.Value);
                    var updateRate = buffItem.BuffCfg.Buff.UpdateRate;
                    buffItem.TimeLeft.Value -= timePast;
                    if (updateRate > 0)
                    {
                        buffItem.TimePast += timePast;
                        var updateTimes = (int)(buffItem.TimePast / updateRate);
                        buffItem.TimePast -= updateTimes * updateRate;
                        for (int i = 0; i < updateTimes; i++)
                        {
                            UtilBuff.BuffEffect(buffItem, EBuffEffectTimingType.During);
                        }
                    }
                    else
                    {
                        UtilBuff.BuffEffect(buffItem, EBuffEffectTimingType.During);
                    }
                    if (buffItem.TimeLeft.Value == 0)
                    {
                        buffItem.State = EState.Leave;
                    }
                    break;
                case EState.Leave:
                    buffItem.Level.Value--;
                    UtilBuff.BuffEffect(buffItem, EBuffEffectTimingType.LevelDown);
                    if (buffItem.Level.Value <= 0)
                    {
                        UtilBuff.BuffEffect(buffItem, EBuffEffectTimingType.Leave);
                        _removeListTemp.Add(item.Key);
                    }
                    else
                    {
                        buffItem.State = EState.Update;
                        buffItem.TimeLeft.Value = buffItem.TimeMax;
                        buffItem.TimePast = 0;
                    }
                    break;
            }
        }
        foreach (var key in _removeListTemp)
        {
            buff.BuffMap.Remove(key);
        }
    }

}