using System.Collections.Generic;
using cfg.BuffCfg;
using Framework;
using Gameplay.Area;
using Gameplay.Unit;

namespace Gameplay.Buff
{

    public class UnitBuffManager
    {

        public readonly GameUnit owner;

        public readonly List<BaseBuff> totalBuffList;
        private readonly Dictionary<int, BaseBuff> _groupMap;
        private readonly List<BaseBuff> _needRemoveList;

        public List<int> avoidBuffIds;

        public UnitBuffManager(GameUnit owner)
        {
            this.owner = owner;
            totalBuffList = new List<BaseBuff>();
            _groupMap = new Dictionary<int, BaseBuff>();
            _needRemoveList = new List<BaseBuff>();
            avoidBuffIds = new List<int>();
        }
        
        public bool HasBuffGroup(int groupId)
        {
            return _groupMap.ContainsKey(groupId);
        }

        public void AddBuffByIds(List<int> buffIds)
        {
            for (var i = 0; i < buffIds.Count; ++i)
            {
                var buffId = buffIds[i];
                AddBuffById(buffId);
            }
        }

        public void AddBuffById(int buffId)
        {
            var addBuff = BuffManager.instance.CreateBuffById(owner, buffId);
            AddBuff(addBuff);
        }

        public void AddBuffById(int buffId, GameUnit creator)
        {
            var addBuff = BuffManager.instance.CreateBuffById(creator, buffId);
            AddBuff(addBuff);
        }

        public void RemoveBuffByIds(List<int> buffIds)
        {
            for (var i = 0; i < buffIds.Count; ++i)
            {
                var buffId = buffIds[i];
                RemoveBuffById(buffId);
            }
        }

        public bool CheckHasBuffType(EBuffType buffType)
        {
            for (var i = 0; i < totalBuffList.Count; ++i)
            {
                var buff = totalBuffList[i];
                if (buff.configData.BuffType == buffType)
                {
                    return true;
                }
            }
            return false;
        }

        public bool CheckHasBuffTypeExcept(EBuffType buffType,
            BaseBuff exceptBuff)
        {
            for (var i = 0; i < totalBuffList.Count; ++i)
            {
                var buff = totalBuffList[i];
                if (buff == exceptBuff)
                {
                    continue;
                }
                if (buff.configData.BuffType == buffType)
                {
                    return true;
                }
            }
            return false;
        }

        public List<BaseBuff> GetBuffsByType(EBuffType buffType)
        {
            var findList = new List<BaseBuff>();
            for (var i = 0; i < totalBuffList.Count; ++i)
            {
                var buff = totalBuffList[i];
                if (buff.configData.BuffType == buffType)
                {
                    findList.Add(buff);
                }
            }
            return findList;
        }
        
        public BaseBuff GetBuffByType(EBuffType buffType)
        {
            for (var i = 0; i < totalBuffList.Count; ++i)
            {
                var buff = totalBuffList[i];
                if (buff.configData.BuffType == buffType)
                {
                    return buff;
                }
            }
            return null;
        }

        public void RemoveBuff(BaseBuff buff)
        {
            var isInList = totalBuffList.Contains(buff);
            if (!isInList)
            {
                return;
            }
            AddNeedRemoveBuff(buff);
        }

        public void RemoveBuffById(int buffId)
        {
            var findBuff = totalBuffList.Find(buff => buff.configData.ID == buffId);
            if (findBuff == null)
            {
                return;
            }
            AddNeedRemoveBuff(findBuff);
        }

        public void AddBuff(BaseBuff buff)
        {
            
            if (buff == null)
            {
                DebugUtil.LogError("buff为空");
                return;
            }
            
            if (avoidBuffIds.Contains(buff.configData.ID))
            {
                // 需要把buff返回池
                BuffManager.ReturnBuff(buff);
                return;
            }
            
            if (buff.configData.BuffEffectType == EBuffEffectType.NegativeBuff)
            {
                // 负面buff
                var randomValue = UnityEngine.Random.Range(0, 1f);
                var ignoreRate = owner.fightData.ignoreDebuffRate;
                if (randomValue < ignoreRate)
                {
                    // 免疫
                    DebugUtil.Log("触发免疫debuff");
                    // 需要把buff返回池
                    BuffManager.ReturnBuff(buff);
                    return;
                }
            }
            if (!buff.configData.CanTriggerOnDead && owner.statusData.isDead)
            {
                // 不可添加
                // 需要把buff返回池
                BuffManager.ReturnBuff(buff);
                return;
            }
            
            var repeatType = buff.configData.RepeatType;
            var noAdd = false;
            switch (repeatType)
            {
                case EBuffRepeatType.None:
                    // 不做处理
                    break;
                case EBuffRepeatType.Replace:
                {
                    // 找到旧的,全部删除
                    if (_groupMap.TryGetValue(buff.configData.GroupId, out var oldBuff))
                    {
                        // 判断强度
                        if (oldBuff.configData.Level == buff.configData.Level)
                        {
                            noAdd = true;
                            // 刷新持续时间
                            oldBuff.RefreshDuring();
                        }
                        else if (oldBuff.configData.Level > buff.configData.Level)
                        {
                            // 新的buff强度不够,不添加
                            noAdd = true;
                        }
                        else
                        {
                            AddNeedRemoveBuff(oldBuff, true);
                        }
                    }
                }
                    break;
                case EBuffRepeatType.RefreshTime:
                {
                    // 找到旧的,刷新持续时间
                    if (_groupMap.TryGetValue(buff.configData.GroupId, out var oldBuff))
                    {
                        oldBuff.RefreshDuring();
                        noAdd = true;
                    }
                }
                    break;
                case EBuffRepeatType.Merge:
                {
                    if (_groupMap.TryGetValue(buff.configData.GroupId, out var oldBuff))
                    {
                        AddNeedRemoveBuff(oldBuff);
                        var combineLevel = oldBuff.configData.Level + buff.configData.Level;
                        var searchBuffConfig = GroupBuffManager.instance.SearchBuff(buff.configData.GroupId, combineLevel);
                        if (searchBuffConfig == null)
                        {
                            DebugUtil.LogError("合并buff失败，找不到对应的buff配置");
                            noAdd = true;
                        }
                        else
                        {
                            // 替换新的buff
                            var newBuff = BuffManager.instance.CreateBuffByConfig(owner, searchBuffConfig);
                            // 需要把buff返回池
                            BuffManager.ReturnBuff(buff);
                            buff = newBuff;
                        }
                    }
                }
                    break;
                default:
                    DebugUtil.LogError("暂未处理的repeatType:{0}", repeatType);
                    break;
            }

            if (noAdd)
            {
                // 需要把buff返回池
                BuffManager.ReturnBuff(buff);
            }
            else
            {
                _AddBuff(buff);
            }
        }

        public void TriggerOnAddDebuff()
        {
            _DebuffCountChanged();
        }

        public void TriggerOnRemoveDebuff()
        {
            _DebuffCountChanged();
        }

        private void _DebuffCountChanged()
        {
            var getBuff = GetBuffByType(EBuffType.DownScaleOnDebuff);
            if (getBuff == null) return;
            var buff = getBuff as BuffSetBeHitScaleOnDebuffChange;
            if (buff == null)
            {
                DebugUtil.LogError("BuffSetBeHitScaleOnDebuffChange类型错误");
                return;
            }
            var nowDebuffCount = GetDebuffCount();
            var oldDebuffCount = buff.oldDebuffCount;
            var oldChangeValue = buff.GetBeHitScale(oldDebuffCount);
            owner.fightData.beDamageScale -= oldChangeValue;
            var newChangeValue = buff.GetBeHitScale(nowDebuffCount);
            owner.fightData.beDamageScale += newChangeValue;
            buff.oldDebuffCount = nowDebuffCount;
        }
        
        public bool CheckHasAnyDebuff()
        {
            for (var i = 0; i < totalBuffList.Count; ++i)
            {
                var buff = totalBuffList[i];
                if (buff.configData.BuffEffectType == EBuffEffectType.NegativeBuff)
                {
                    return true;
                }
            }
            return false;
        }

        public int GetDebuffCount()
        {
            var count = 0;
            for (int i = 0; i < totalBuffList.Count; i++)
            {
                var buff = totalBuffList[i];
                if (buff.configData.BuffEffectType == EBuffEffectType.NegativeBuff)
                {
                    count++;
                }
            }
            return count;
        }

        private void _AddBuff(BaseBuff buff)
        {
            // owner.Log("增加buff:" + buff);
            buff.owner = owner;

            // 这里会调用buff的OnInit方法
            buff.Init();
            buff.TriggerAdd();
            totalBuffList.Add(buff);
            
            if (buff.configData.GroupId != 0)
            {
                _groupMap[buff.configData.GroupId] = buff;
            }
            
            if (buff.configData.BuffEffectType == EBuffEffectType.NegativeBuff)
            {
                // 负面buff
                owner.buffManager.TriggerOnAddDebuff();
            }
            
        }

        private void _RemoveBuff(BaseBuff buff)
        {
            var index = totalBuffList.IndexOf(buff);
            if (index < 0)
            {
                return;
            }
            buff.TriggerRemove();
            totalBuffList.RemoveAt(index);
            
            if (buff.configData.BuffEffectType == EBuffEffectType.NegativeBuff)
            {
                // 负面buff
                owner.buffManager.TriggerOnRemoveDebuff();
            }
            
            BuffManager.ReturnBuff(buff);

            if (buff.configData.GroupId != 0)
            {
                if (_groupMap.TryGetValue(buff.configData.GroupId, out var oldBuff) && oldBuff == buff)
                {
                    // 移除
                    _groupMap.Remove(buff.configData.GroupId);
                }
            }

        }

        public void AddNeedRemoveBuff(BaseBuff buff, bool imdRemove = false)
        {
            if (imdRemove)
            {
                _RemoveBuff(buff);
                return;
            }
            if (_needRemoveList.Contains(buff))
            {
                return;
            }
            _needRemoveList.Add(buff);
        }

        public void UpdateOnlyRemoveAdd()
        {
            
            if (_needRemoveList.Count > 0)
            {
                for (var i = 0; i < _needRemoveList.Count; ++i)
                {
                    var buff = _needRemoveList[i];
                    _RemoveBuff(buff);
                }
                _needRemoveList.Clear();
            }
        }

        public void LogicUpdate(float dt)
        {
            
            for (var i = 0; i < totalBuffList.Count; ++i)
            {
                if (i >= totalBuffList.Count) break; // 防止在循环中删除buff导致越界
                
                var buff = totalBuffList[i];
                if (buff.needRemove)
                {
                    _RemoveBuff(buff);
                    i--;
                    continue;
                }
                
                buff.LogicUpdate(dt);

                if (buff.needRemove)
                {
                    _RemoveBuff(buff);
                    i--;
                }
                
            }

            if (_needRemoveList.Count > 0)
            {
                for (var i = 0; i < _needRemoveList.Count; ++i)
                {
                    var buff = _needRemoveList[i];
                    _RemoveBuff(buff);
                }
                _needRemoveList.Clear();
            }

        }

        public void TriggerReload()
        {
            _InnerTrigger(ETriggerType.ON_RELOAD);
        }

        public void TriggerNormalAttack()
        {
            _InnerTrigger(ETriggerType.ON_NORMAL_ATTACK);
        }

        public void TriggerEnterBattle()
        {
            _InnerTrigger(ETriggerType.ON_ENTER_BATTLE);
        }
        
        public void TriggerExitBattle()
        {
            _InnerTrigger(ETriggerType.ON_EXIT_BATTLE);
        }

        public void TriggerKillUnit(GameUnit unit)
        {
            _InnerTrigger(ETriggerType.ON_KILL_UNIT);

            if (owner.debugShowInfo.cacheConfigId != 0)
            {
                EventManager.Instance.Send(EventManager.EventName.INFIGHT_AUDIO_KILL_ENEMY, owner.debugShowInfo.cacheConfigId);
            }

            if (unit.debugShowInfo.cacheConfigId != 0)
            {
                EventManager.Instance.Send(EventManager.EventName.INFIGHT_AUDIO_BE_ATTACK_AND_DEAD, unit.debugShowInfo.cacheConfigId);
            }
        }

        public void TriggerCellIndexChange()
        {
            _InnerTrigger(ETriggerType.ON_CELLINDEX_CHANGE);
            
            // 触发buff的特殊事件
            for (int i = 0; i < totalBuffList.Count; i++)
            {
                var buff = totalBuffList[i];
                if (buff.needRemove) continue;
                buff.TriggerCellIndexChange();
            }
        }

        public void TriggerFriendRetreat(GameUnit friendUnit)
        {
            var getBuff = GetBuffByType(EBuffType.AddOnFriendRetreat);
            if (getBuff == null) return;
            var buff = getBuff as BuffAddBuffOnFriendRetreat;
            if (buff == null)
            {
                DebugUtil.LogError("BuffAddBuffOnFriendRetreat类型错误");
                return;
            }
            var checkRange = buff.checkRange;
            var distance = AreaManager.instance.GetDistance(friendUnit.transData.cellIndex, owner.transData.cellIndex);
            if (distance <= checkRange)
            {
                AddBuffByIds(buff.buffIds);
            }
        }

        public void TriggerOnRetreat()
        {
            _InnerTrigger(ETriggerType.ON_RETREAT);
            
            // 触发buff的特殊事件
            var allUnits = GameUnitManager.instance.infightUnits.unitList;
            for (int i = 0; i < allUnits.Count; i++)
            {
                var unit = allUnits[i];
                if (unit == owner) continue;
                if (unit.commonData.troopId == owner.commonData.troopId)
                {
                    unit.buffManager.TriggerFriendRetreat(owner);
                }
            }
        }

        public void TriggerOnTakeDamage()
        {
            _InnerTrigger(ETriggerType.ON_TAKEDAMAGE);
            
            // 触发buff的特殊事件
            for (int i = 0; i < totalBuffList.Count; i++)
            {
                var buff = totalBuffList[i];
                if (buff.needRemove) continue;
                buff.TriggerOnTakeDamage();
            }
        }

        private void _InnerTrigger(ETriggerType triggerType)
        {
            for (int i = 0; i < totalBuffList.Count; i++)
            {
                var buff = totalBuffList[i];
                if (buff.needRemove) continue;
                buff.SpecialTrigger(triggerType);
            }
        }
        
    }
}