--UI对象池
UIObjPool = UIObjPool or BaseClass()
local UIObjPool = UIObjPool

--类型ID，从1开始递增
UIObjPool.UIType = {
	AwardItem = 1,
}
--缓存对象信息
UIObjPool.UIInfo = {
	[UIObjPool.UIType.AwardItem] = {id = 1, max_num = 15, class_type = "AwardItem"},
}

function UIObjPool:__init()
	UIObjPool.Instance = self
	self.is_init = false
	self.ui_pool = {}
	for k,v in pairs(UIObjPool.UIType) do
		self.ui_pool[v] = Array.New()
	end
	
	local pool_cont = GameObject.Find("UIObjPoolContainer")
	if not IsNull(pool_cont) then
		self.parent_cont = pool_cont.transform
		self.parent_cont.gameObject:SetActive(false)
	else
		self.parent_cont = panelMgr:GetParent("UI")
	end

	self:InitUIPool()
end

function UIObjPool:getInstance()
	if UIObjPool.Instance == nil then
		UIObjPool.New()
	end
	return UIObjPool.Instance
end

function UIObjPool:__delete( )
	self:CancelStepTimer()
	for i=1, TableSize(UIObjPool.UIType) do
		local pool = self.ui_pool[i]
		for k,v in pairs(pool) do
			v:DeleteMe()
		end
	end
	self.ui_pool = {}
end

function UIObjPool:InitUIPool( )
	--避免重复执行
	if self.is_init then
		return
	end
	self.is_init = true

	--分步初始化对象池
	self.pool_index, self.info_index = 1, 1
	local pool_len = TableSize(UIObjPool.UIType)
	local item

	local function on_init(  )
		if self.pool_index > pool_len then
			self:CancelStepTimer()
			return
		end
		local info = UIObjPool.UIInfo[self.pool_index]
		if not info then
			self:CancelStepTimer()
			return 
		end
		if self.info_index > info.max_num then
			self.pool_index = self.pool_index + 1
		else
			item = _G[info.class_type].New(self.parent_cont)
			item:SetVisible(false)
			self.ui_pool[self.pool_index]:PushFront(item)
			self.info_index = self.info_index + 1
		end
		-- print("huangcong:UIObjPool [start:68] TableSize():", TableSize(self.ui_pool))
	end

	if not self.step_init_id then
		self.step_init_id = GlobalTimerQuest:AddPeriodQuest(on_init, 0.02, -1)
	end
end

function UIObjPool:CancelStepTimer( )
	if self.step_init_id then
		GlobalTimerQuest:CancelQuest(self.step_init_id)
		self.step_init_id = nil
	end
end

--外部接口，从对象池获取对象（类型id, 对象的父节点）
function UIObjPool:PopItem( ui_type, ui_parent)
	local pool = self.ui_pool[ui_type]
	local info = UIObjPool.UIInfo[ui_type]
	local item
	if pool and pool:GetSize() > 0 then
		item = pool:PopFront()
		if ui_parent then
			item:SetVisible(true)
			item.parent = ui_parent
			item.transform:SetParent(ui_parent)
			item:SetPosition(0,0)
		end
		if item.ResetInfo then
			item:ResetInfo()
		end
	else
		if info and ui_parent then
			item = _G[info.class_type].New(ui_parent)
		end
	end
	return item
end

--外部接口，存入对象池（类型id, ui对象）
function UIObjPool:PushItem( ui_type, ui_item )
	-------------------------
	if ui_type == UIObjPool.UIType.AwardItem then
		if not ui_item.SetItemSize then
			GlobalEventSystem:Fire(LuaErrorModel.SEND_LUAERROR_MESSAGE,"存了一个奇怪的东西进AwardItem对象池,请把日志移交前端")
			print('---- UIObjPool.lua -- 存了一个奇怪的东西进AwardItem对象池')
			PrintCallStack()
		end
	end
	-------------------------
	local info = UIObjPool.UIInfo[ui_type]
	local pool = self.ui_pool[ui_type]
	if (ui_item and ui_item.is_loaded) and pool:GetSize() < info.max_num then
		ui_item.transform:SetParent(self.parent_cont)
		ui_item:SetVisible(false)
		pool:PushFront(ui_item)
	else
		if ui_item then
			ui_item:DeleteMe()
			ui_item = nil
		end
	end
end