---@class W_CenterScrollBox_C:UUserWidget
---@field ScrollBox_Target UScrollBox
--Edit Below--
---@type W_CenterScrollBox_C
local W_CenterScrollBox = {
    bInitDoOnce = false;

    bTickEnable = false;

    ---@param ScrollSizeY float 滚动框高度
    ScrollSizeY = 0.;
    ---@param HideWidgetNum int 计算后需要的高度与Item相同的隐藏Widget的个数
    HideWidgetNum = 0;
    ---@param InitScroll float 计算后所得的初始中心滚动位置
    InitScroll = 0.;
    ---@param ItemSizeY float Item的高度，需在外部写死
    ItemSizeY = 100;
    ---@param bSelecting bool 是否正在滚动选择
    bSelecting = false;
    ---@param ScrollStopWaitTime float 延迟触发暂停滚动，自动滚动到就近的Item中心位置
    ScrollStopWaitTime = 0.2;
    ---@param ScrollStopWaitHandle TimerHandle 暂停滚动的Handle
    ScrollStopWaitHandle = nil;
    ---@param TargetScroll float 目标滚动的位置
    TargetScroll = 0.;
    ---@param ScrollInterpSpeed float 滚动结束自动过渡时的速度
    ScrollInterpSpeed = 10.;
    ---@param SelectIndex int 当前选择中的Index
    SelectIndex = -1;
    ---@param ItemClass UUserWidget
    ItemClass = nil;
    ---@param NumItem int Item个数
    NumItem = 0;
    ---@param ItemInitFuncName string Item初始化函数名
    ItemInitFuncName = nil;
    ---@param ItemSelectFuncName string Item被选择函数名
    ItemSelectFuncName = nil;
    ---@param ClickSelectBtnName string Item点击选中Button名
    ClickSelectBtnName = nil;
};


function W_CenterScrollBox:Construct()
	--Test
    --UGCEventSystem.SetTimer(
    --    self,
    --    function()
    --        self:Init(
    --            UE.LoadClass(UGCGameSystem.GetUGCResourcesFullPath('Asset/UI/W_SelectWeapon_Item2.W_SelectWeapon_Item2_C')),
    --            130.,
    --            "InitSelectInfo",
    --            "SetSelect"
    --        )
    --        local ItemParams = {}
    --        for k, WeaponTypeInfo in pairs(Tables.WeaponAndProps_V2.WeaponTypeInfos) do
    --            UGCLogSystem.Log("[W_CenterScrollBox_Construct] k:%d , WeaponType:%s", k, WeaponTypeInfo.Name)
    --            local ItemParam = {Enum.SelectWeapon.SelectWeaponType, false, WeaponTypeInfo.Icon, WeaponTypeInfo.Name, k}
    --            ItemParams[#ItemParams + 1] = ItemParam
    --        end
    --        self:UpdateItemInfo(ItemParams)
    --
    --    end,
    --    2.
    --)
    -- Tick 函数判断是否触发
    UGCEventSystem.SetTimer(
        self,
        function()
            if self.bTickEnable == false then
                -- 踏马的Tick不调
                local LastTime = KismetSystemLibrary.GetGameTimeInSeconds(self)
                UGCEventSystem.SetTimerLoop(
                        self,
                        function()
                            local NowTime = KismetSystemLibrary.GetGameTimeInSeconds(self)
                            self:Tick(nil, NowTime - LastTime)
                            LastTime = NowTime
                        end,
                        0.01
                )
            end
        end,
        0.1
    )
end


function W_CenterScrollBox:Tick(MyGeometry, InDeltaTime)
    self.bTickEnable = true
    -- UGCLogSystem.Log("[W_CenterScrollBox_Tick]")
    if self.bSelecting == false then
        -- UGCLogSystem.Log("[W_CenterScrollBox_Tick] Begin")
        local NowOffset = self.ScrollBox_Target:GetScrollOffset()
        local SetOffset = KismetMathLibrary.FInterpTo(NowOffset, self.TargetScroll, InDeltaTime, self.ScrollInterpSpeed)
        self.ScrollBox_Target:SetScrollOffset(SetOffset)
        -- UGCLogSystem.Log("[W_CenterScrollBox_Tick] Finish")
    end

end

-- function W_CenterScrollBox:Destruct()

-- end
function W_CenterScrollBox:GetScrollBoxSizeY()
    local CanvasSlot = WidgetLayoutLibrary.SlotAsCanvasSlot(self)
    return CanvasSlot:GetSize().Y
end
--- 初始化函数
---@param ItemClass UUserWidget
---@param ItemSizeY float Item的高度
---@param ItemInitFuncName string Item初始化函数名
---@param ItemSelectFuncName string Item设置选择函数名
---@param ClickSelectBtnName string Item点击选中Button名
function W_CenterScrollBox:Init(ItemClass, ItemSizeY, ItemInitFuncName, ItemSelectFuncName, ClickSelectBtnName)
    self.ItemClass = ItemClass
    self.ItemSizeY = ItemSizeY
    self.ItemInitFuncName = ItemInitFuncName
    self.ItemSelectFuncName = ItemSelectFuncName
    self.ClickSelectBtnName = ClickSelectBtnName
    self.ScrollSizeY = self:GetScrollBoxSizeY()
    UGCLogSystem.Log("[W_CenterScrollBox_Init] ScrollSizeY: %f", self.ScrollSizeY)

    -- SetInitScroll
    --self.InitScroll = self.ItemSizeY * (0.5 + math.ceil((self.ScrollSizeY / 2. - self.ItemSizeY / 2.) / self.ItemSizeY)) - self.ScrollSizeY / 2.
    --UGCLogSystem.Log("[W_CenterScrollBox_Init] InitScroll: %f", self.InitScroll)

    -- SetHideWidgetNum
    -- self.HideWidgetNum = math.ceil(self.InitScroll / self.ItemSizeY + 0.5)
    self.HideWidgetNum = math.ceil((self.ScrollSizeY - self.ItemSizeY) / 2 / self.ItemSizeY)
    UGCLogSystem.Log("[W_CenterScrollBox_Init] HideWidgetNum: %d", self.HideWidgetNum)

    self.InitScroll = self.HideWidgetNum * self.ItemSizeY + self.ItemSizeY / 2 - self.ScrollSizeY / 2.
    UGCLogSystem.Log("[W_CenterScrollBox_Init] InitScroll: %f", self.InitScroll)

    self.ScrollBox_Target.OnUserScrolled:Add(self.BoxScroll, self)
end

--- 绑定滚动到新的Item委托
---@param Func function Item:UUserWidget*, SelectIndex:int
function W_CenterScrollBox:BindUpdateSelectItem(Func, Obj)
    self.UpdateSelectDelegation = {Func = Func, Obj = Obj}
end

function W_CenterScrollBox:ExeUpdateSelectItemDelegation(Item)
    if self.UpdateSelectDelegation then
        if self.UpdateSelectDelegation.Obj then
            self.UpdateSelectDelegation.Func(self.UpdateSelectDelegation.Obj, Item, self.SelectIndex)
        else
            self.UpdateSelectDelegation.Func(Item, self.SelectIndex)
        end
    end
end


function W_CenterScrollBox:BoxScroll()
    self.bSelecting = true
    if self.ScrollStopWaitHandle ~= nil then
        UGCEventSystem.StopTimer(self.ScrollStopWaitHandle)
        self.ScrollStopWaitHandle = nil
    end
    self:UpdateSelect()
    self.ScrollStopWaitHandle = UGCEventSystem.SetTimer(
        self,
        function ()
            self:UpdateSelect()
            self.bSelecting = false
            self.ScrollStopWaitHandle = nil
        end,
        self.ScrollStopWaitTime
    )
end

function W_CenterScrollBox:GetItemIndex(Item)
    for i = 0, self.ScrollBox_Target:GetChildrenCount() - 1 do
        if self.ScrollBox_Target:GetChildAt(i) == Item then
            return i - self.HideWidgetNum
        end
    end
end

--- 更新滚动表数据
---@param ItemInitParams table Item初始化的参数
function W_CenterScrollBox:UpdateItemInfo(ItemInitParams)
    self.NumItem = #ItemInitParams
    while self.ScrollBox_Target:GetChildrenCount() < (self.NumItem + self.HideWidgetNum * 2) do
        local ItemInst = UserWidget.NewWidgetObjectBP(UGCSystemLibrary.GetLocalPlayerController(), self.ItemClass)
        self.ScrollBox_Target:AddChild(ItemInst)
        if ItemInst[self.ClickSelectBtnName] then
            ItemInst[self.ClickSelectBtnName].OnClicked:Add(function()
                self:UpdateSelect(self:GetItemIndex(ItemInst))
            end)
        end
    end
    UGCLogSystem.Log("[W_CenterScrollBox_UpdateItemInfo] NumItem:%d , ChildrenCount:%d", self.NumItem, self.ScrollBox_Target:GetChildrenCount())
    for i = 0, self.ScrollBox_Target:GetChildrenCount() - 1 do
        local TempItem = self.ScrollBox_Target:GetChildAt(i)

        if i >= (self.NumItem + self.HideWidgetNum * 2) then
            TempItem:SetVisibility(ESlateVisibility.Collapsed)
        elseif (i < self.HideWidgetNum) or (i >= (self.NumItem + self.HideWidgetNum))then
            TempItem:SetVisibility(ESlateVisibility.Hidden)
        else
            TempItem:SetVisibility(ESlateVisibility.SelfHitTestInvisible)
            TempItem[self.ItemInitFuncName](TempItem, table.unpack(ItemInitParams[i + 1 - self.HideWidgetNum]))
        end
    end
    self:UpdateSelect(0)
    UGCLogSystem.Log("[W_CenterScrollBox_UpdateItemInfo] Finish")
end

--- 获取Item
function W_CenterScrollBox:GetScrollItem(Index)
    return self.ScrollBox_Target:GetChildAt(Index + self.HideWidgetNum)
end

--- 获取启用的Item数量
function W_CenterScrollBox:GetEnableItemNum()
    return self.NumItem
end

function W_CenterScrollBox:SetItemSelect(Index, IsSelect)
    if self.ItemSelectFuncName then
        local Item = self:GetScrollItem(Index)
        if Item then
            Item[self.ItemSelectFuncName](Item, IsSelect)
        end
    end
end

--- 滚动到中间
function W_CenterScrollBox:ScrollToMidItem()
    local ScrollNum = math.floor(self.NumItem / 2) - (self.NumItem % 2 == 0 and 1 or 0)
    self:UpdateSelect(ScrollNum)
end

--- 刷新滚动的位置
function W_CenterScrollBox:UpdateSelect(SelectIndex)
     -- GetTargetScorll
    local ScrollOffset = self.ScrollBox_Target:GetScrollOffset()
    local MustBeUpdated = false
    if SelectIndex == nil then
        SelectIndex = math.clamp(KismetMathLibrary.Round((ScrollOffset - self.InitScroll) / self.ItemSizeY), 0, self.NumItem - 1)
    else
        MustBeUpdated = true
    end
    local SelectItem = self:GetScrollItem(SelectIndex)
    UGCLogSystem.Log("[W_CenterScrollBox_UpdateSelect] SelectItem:%s", tostring(UE.IsValid(SelectItem)))
    -- SetTargetScroll
    self.TargetScroll =  SelectIndex * self.ItemSizeY + self.InitScroll
    UGCLogSystem.Log("[W_CenterScrollBox_UpdateSelect] TargetScroll:%f  ScrollOffset:%f", self.TargetScroll, ScrollOffset)

    UGCLogSystem.Log("[W_CenterScrollBox_UpdateSelect] SelectIndex:%d, self.SelectIndex:%d", SelectIndex, self.SelectIndex)
    if SelectItem and ((SelectIndex ~= self.SelectIndex) or MustBeUpdated) then
        -- 隐藏上次被选中的Item
        self:SetItemSelect(self.SelectIndex, false)
        self.SelectIndex = SelectIndex
        -- 显示现在选中的Item
        self:SetItemSelect(self.SelectIndex, true)
        self:ExeUpdateSelectItemDelegation(SelectItem)
    else
        UGCLogSystem.LogError("[W_CenterScrollBox_UpdateSelect] SelectItem is nil, SelectIndex:%d", SelectIndex)
    end
end

return W_CenterScrollBox;