local FirstPersonEventDispatcher = require"Battle/Logic/Event/FirstPersonEventDispatcher"
local CharacterData = require "Battle/Logic/Entity/CharacterData"
local EventSystem = require('Event/EventSystem')
local ChangeAvatarSystem = {}
local LuaConst=LuaConst
local FP=FP

function ChangeAvatarSystem.OnLogicUpdate(entity)
    local component_Record = entity.components.record
    local timer = component_Record.ChangeAvatarTimer
    if not timer then
        return
    end
    timer = timer - LuaConst.TimeSpanMs
    if timer<= FP.Const.Zero then
        if entity.components.attr:IsAlive() then -- 死亡不再变回来，有复活在回来
            ChangeAvatarSystem.ChangeAvatar(entity, 0)
            timer = nil            
        end
    end
    component_Record.ChangeAvatarTimer = timer
end

function ChangeAvatarSystem.OnSwitchHero(fromEntity, toEntity, dontBackground)
    if not dontBackground then
        ChangeAvatarSystem.OnBackground(fromEntity)
    end
end

function ChangeAvatarSystem.OnBackground(entity)
    local component_Base = entity.components.base
    local logicInitData = entity._logicInitData

    if component_Base.CurCharacterData ~= logicInitData._characterData then
        ChangeAvatarSystem.ChangeAvatar(entity,0)
    end

    if component_Base.CurModelData ~= logicInitData._modelData then
        ChangeAvatarSystem.ChangeModel(entity,0)
    end
end

--[[
    触发事件
--]]
function ChangeAvatarSystem.OnTriggerAction(entity, skillEvent, modelOnly)
    if modelOnly then
        ChangeAvatarSystem.ChangeModel(entity, skillEvent.EventIntParam)
    else
        -- 大变身
        local inheritSkillCD = skillEvent.EventType == LuaConst.SkillEventType.ChangeAvatarInheritSkillCD
        if skillEvent.EventIntParam == 0 then -- EventIntParam 为0 时，表示技能主动变回原身
            ChangeAvatarSystem.ChangeAvatar(entity, 0, nil, nil, nil, nil, nil, inheritSkillCD)
        else
            local skillChangeMonsters = entity.components.base.CurCharacterData.ChangeMonsterList
            if skillChangeMonsters then
                local characterID = skillChangeMonsters[skillEvent.EventIntParam]
                if characterID then
                    ChangeAvatarSystem.ChangeAvatar(entity, characterID, skillEvent.EventParam, true, true, nil,nil, inheritSkillCD)
                else
                    logging.error(LTAG.ERROR, "策划配表错误 : 技能变身时，发现skill大变身事件值不对；怪物id =", entity.components.base.CurCharacterData.ID, "，技能id =", entity.components.skillBase.CurrentSkillID)
                end
            else
                logging.error(LTAG.ERROR, "策划配表错误 : 技能变身时，发现skill大变身字段没有值；怪物id =", entity.components.base.CurCharacterData.ID)
            end
        end
    end
end

--小变身（只变模型数据）
function ChangeAvatarSystem.ChangeModel(entity, modelID, keepAnim, canRideHorse, withMagicWeapon)
    local component_Base = entity.components.base
    component_Base:SetCurModelData(modelID == 0 and entity._logicInitData._modelData or DataSheetManager.MonsterModelData:GetDataByID(modelID))
    local canRide = canRideHorse
    if canRideHorse == nil then -- 不要用语法糖 and .. or ..
        canRide = true
    end
    entity.components.replace:UpdateCurModelCacheData()
    local isWithMagicWeapon = withMagicWeapon
    if modelID == 0 then -- 还原为最初模型，需要尝试佩戴神兵
        isWithMagicWeapon = true
        SystemManager.JustChangeExpAnim(entity,LuaConst.Animation_idle_loop) -- 为了回收变身模型再次使用能从entry进入，强制设置为idle，否则会动画卡住。（董卓P2卡在skill2）
    end
    SystemManager.OnChangeModel(entity, keepAnim, canRide, isWithMagicWeapon)
    
    if modelID == 0 then--如果对象池回收时重设animator则这代码不需要
        SystemManager.JustChangeExpAnim(entity,LuaConst.Animation_idle_loop) -- 恢复为原模型后，如果变身前原模型带有动画，动画被卡住（loop的话会循环播放）
    end
end

--大变身(改变Character数据)  isInheritSkillCD:继承同按钮位置的技能CD
function ChangeAvatarSystem.ChangeAvatar(entity, characterID, duration, withBornSkill, stopRideHorse, withMagicWeapon, isFreeChange, isInheritSkillCD, inheritSkillKeyPosList)

    local component_Base = entity.components.base
    SystemManager.BeforeChangeAvatar(entity)
    SystemManager.ChangeToSwitchAll(entity) -- 大变身前技能强制后摇
    local comp_Base = entity.components.base
    local bornBuffs = comp_Base.CurCharacterData.BornBuffs 
    for i,buffId in ipairs(bornBuffs) do -- 删除变身前天生buff
        SystemManager.DeleteBuff(entity, buffId, entity)
    end

    local component_Record = entity.components.record
    local characterData
    local modelData
    local recover = characterID == 0
    local isWithMagicWeapon = withMagicWeapon -- 注：当模型表的equip配置为-1时，会强行使用武将的神兵外显
    local isFree = isFreeChange -- 目前只用在了控制是否要 ：神兵升级技能替换原有技能
    if recover then
        characterData = entity._logicInitData._characterData
        modelData = entity._logicInitData._modelData
        isWithMagicWeapon = true
        isFree = false
    else
        characterData = component_Base.AllCharacterData[characterID]
        if not characterData then
            characterData = CharacterData:new(characterID, entity._logicInitData.CharacterType)
            component_Base.AllCharacterData[characterID] = characterData
        end
        modelData = DataSheetManager.MonsterModelData:GetDataByID(characterData.ModelID)
    end
    
    component_Base.CurCharacterData = characterData
    component_Base:SetCurModelData(modelData)
    component_Base:SetMonsterFeature()
    if duration and duration > FP.Const.Zero then
        component_Record.ChangeAvatarTimer = duration
    else
        component_Record.ChangeAvatarTimer = nil
    end

   entity.components.replace:UpdateCurModelCacheData()
    
    SystemManager.OnChangeAvatar(entity, recover, withBornSkill, stopRideHorse, isWithMagicWeapon, isFree, isInheritSkillCD, inheritSkillKeyPosList)
    SystemManager.SetNextState(LuaConst.StateType.Idle, entity, 0)
    -- 主视角事件统一用 FirstPersonEventDispatcher 派发
    FirstPersonEventDispatcher.Player_ChangeAvatar(entity)
end

-- 小变身恢复模型
function ChangeAvatarSystem.ResetOriginalModel(entity)
    local comp_Base = entity.components.base
    local comp_Record = entity.components.record
    --不处于大变身中，且模型数据改变了，才Reset回去
    if not entity:IsAvatarChanged() and 
            comp_Base.CurModelData ~= entity._logicInitData._modelData then
        ChangeAvatarSystem.ChangeModel(entity,0)
    end
end

function ChangeAvatarSystem.OnWinBattle(entity)
    local comp_Base = entity.components.base
    local comp_Record = entity.components.record
    if comp_Record.ChangeAvatarTimer 
            and comp_Base.CurCharacterData ~= entity._logicInitData._characterData then
        ChangeAvatarSystem.ChangeAvatar(entity,0)
    end
    if not comp_Record.ChangeAvatarTimer and
            comp_Base.CurModelData ~= entity._logicInitData._modelData then
        ChangeAvatarSystem.ChangeModel(entity,0)
    end
    
end

function ChangeAvatarSystem.OnRevive(entity)
    local comp_Base = entity.components.base
    local comp_Record = entity.components.record
    if comp_Base.CurCharacterData ~= entity._logicInitData._characterData then
        ChangeAvatarSystem.ChangeAvatar(entity,0)
    end
    if comp_Base.CurModelData ~= entity._logicInitData._modelData then
        ChangeAvatarSystem.ChangeModel(entity,0)
    end

end


return ChangeAvatarSystem