local Menu = {}

local MENU_ANIM_TYPE = {
    ["FLICKER"]      = "FLICKER",       -- 闪动
    ["MAGNIFY"]      = "MAGNIFY"        -- 放大
}

local CURRENT_ITEM_SCALE = 1.2
local DEFAULT_ITEM_COUNT = 3

local nCurrentItemIndex  = 0
local currentAnimType    = MENU_ANIM_TYPE.FLICKER

local function StopCurrentItemAnim()
    local rootPanel         = Menu.rootPanel
    local panelBtnContent   = rootPanel.transform:Find("Panel_BtnContent").gameObject
    local currentItem       = panelBtnContent.transform:Find("Btn_" .. nCurrentItemIndex).gameObject

    currentItem.transform.localScale = CS.UnityEngine.Vector3.one
    currentItem.transform:DOKill()
end

local function RefreshCurrentItemAnim()
    local rootPanel         = Menu.rootPanel
    local panelBtnContent   = rootPanel.transform:Find("Panel_BtnContent").gameObject
    local currentItem       = panelBtnContent.transform:Find("Btn_" .. nCurrentItemIndex).gameObject

    if currentAnimType == MENU_ANIM_TYPE.FLICKER then
        currentItem.transform.localScale = CS.UnityEngine.Vector3.one
        currentItem.transform:DOScale(CURRENT_ITEM_SCALE, 1):SetLoops(-1, CS.DG.Tweening.LoopType.Yoyo)
        return
    end

    if currentAnimType == MENU_ANIM_TYPE.MAGNIFY then
        currentItem.transform.localScale = CS.UnityEngine.Vector3(CURRENT_ITEM_SCALE, CURRENT_ITEM_SCALE, 1)
        return
    end
end

local function RefreshBtnBoxUI()
    local rootPanel         = Menu.rootPanel
    local panelBtnContent   = rootPanel.transform:Find("Panel_BtnContent").gameObject
    local nBtnCount         = panelBtnContent.transform.childCount

    local nShowBtnCount     = GetCache("MENU_SHOW_ITEM_COUNT", DEFAULT_ITEM_COUNT)
    local nRefreshItemCount = (nBtnCount - nCurrentItemIndex) + math.floor((nShowBtnCount - DEFAULT_ITEM_COUNT) / 2)

    for i = 0, nRefreshItemCount, 1 do
        panelBtnContent.transform:GetChild(nBtnCount - 1):SetAsFirstSibling()
    end
end

local function RefreshCurrentItemUI()
    local rootPanel         = Menu.rootPanel
    local panelBtnContent   = rootPanel.transform:Find("Panel_BtnContent").gameObject
    local currentItem       = panelBtnContent.transform:Find("Btn_" .. nCurrentItemIndex).gameObject

    currentItem.transform.localScale = CS.UnityEngine.Vector3(CURRENT_ITEM_SCALE, CURRENT_ITEM_SCALE, 1)
end

local function SetPointClick()
    local rootPanel         = Menu.rootPanel
    local panelBtnContent   = rootPanel.transform:Find("Panel_BtnContent").gameObject
    local currentItem       = panelBtnContent.transform:Find("Btn_" .. nCurrentItemIndex).gameObject

    currentItem.transform:GetComponent("Selectable"):Select()
end

local function SelectPreItem()
    StopCurrentItemAnim()

    local rootPanel         = Menu.rootPanel
    local panelBtnContent   = rootPanel.transform:Find("Panel_BtnContent").gameObject
    local nBtnCount         = panelBtnContent.transform.childCount

    panelBtnContent.transform:GetChild(nBtnCount - 1):SetAsFirstSibling()

    if nCurrentItemIndex == 0 then
        nCurrentItemIndex = nBtnCount - 1
    else
        nCurrentItemIndex = nCurrentItemIndex - 1
    end

    RefreshCurrentItemAnim()
    SetPointClick()
end

local function SelectNextItem()
    StopCurrentItemAnim()

    local rootPanel         = Menu.rootPanel
    local panelBtnContent   = rootPanel.transform:Find("Panel_BtnContent").gameObject
    local nBtnCount         = panelBtnContent.transform.childCount

    panelBtnContent.transform:GetChild(0):SetAsLastSibling()

    if nCurrentItemIndex >= nBtnCount - 1 then
        nCurrentItemIndex = 0
    else
        nCurrentItemIndex = nCurrentItemIndex + 1
    end

    RefreshCurrentItemAnim()
    SetPointClick()
end

local function OnClickBtnItem(nClickItem, btnClickItem)
    if nClickItem == nCurrentItemIndex then
        local eventManager = require('Base/ZEventDispatchCenter.lua')
        eventManager:DispatchEvent(eventManager.EventType.COMMON_MENU_CLICK_BUTTON)
        return
    end

    local rootPanel         = Menu.rootPanel
    local panelBtnContent   = rootPanel.transform:Find("Panel_BtnContent").gameObject
    local currentItem       = panelBtnContent.transform:Find("Btn_" .. nCurrentItemIndex).gameObject

    local nClickItemIndex   = btnClickItem.transform:GetSiblingIndex()
    local nCurrentItemIndex = currentItem.transform:GetSiblingIndex()

    if nClickItemIndex < nCurrentItemIndex then
        SelectPreItem()
        return
    end

    if nClickItemIndex > nCurrentItemIndex then
        SelectNextItem()
        return
    end
end

local function RefreshBtnItem()
    local rootPanel         = Menu.rootPanel
    local panelBtnContent   = rootPanel.transform:Find("Panel_BtnContent").gameObject
    local nBtnCount         = panelBtnContent.transform.childCount

    local uiHelper = require('Base/UIHelper.lua')
    for i = 0, nBtnCount - 1, 1 do
        local btnItem = panelBtnContent.transform:GetChild(i).gameObject
        btnItem.name = "Btn_" .. i

        uiHelper:AddClickEvent(panelBtnContent, btnItem.name, function ()
            OnClickBtnItem(i, btnItem)
        end)
    end
end

local function CheckMouseScroll()
    local bMenuScroll = GetCache("MENU_SCROLL")

    if not bMenuScroll then return end

    local Input = CS.UnityEngine.Input
    if Input.mouseScrollDelta.y > 0 then
        SelectPreItem()
        return
    end

    if Input.mouseScrollDelta.y < 0 then
        SelectNextItem()
        return
    end
end

local function CheckGesture()
    if CS.GetCommonActionData.LeftSlipEnumType then
        CS.GetCommonActionData.LeftSlipEnumType = false
        SelectNextItem()
        return
    end

    if CS.GetCommonActionData.RightSlipEnumType then
        CS.GetCommonActionData.RightSlipEnumType = false
        SelectPreItem()
        return
    end
end

local function CheckKeyDown()
    local Input   = CS.UnityEngine.Input
    local KeyCode = CS.UnityEngine.KeyCode

    if Input.GetKeyDown(KeyCode.LeftArrow) then
        SelectPreItem()
        return
    end

    if Input.GetKeyDown(KeyCode.RightArrow) then
        SelectNextItem()
        return
    end
end

local function OnSelectMenu(selected)
    local szCurrentItemName = "Btn_" .. nCurrentItemIndex
    if selected.transform.name ~= szCurrentItemName then
        SetPointClick()
        return
    end

    local eventManager = require('Base/ZEventDispatchCenter.lua')
    eventManager:DispatchEvent(eventManager.EventType.COMMON_UI_NAVIGATOR_ANIM, selected)
end

local function OnChangeSelectButton(lastSelectedObj, selected)
    if lastSelectedObj
        and not lastSelectedObj:Equals(nil)
        and lastSelectedObj.transform:CompareTag("CommonUtilsMenu")
        and lastSelectedObj.transform.name == "Btn_" .. nCurrentItemIndex
    then
        local rootPanel         = Menu.rootPanel
        local panelBtnContent   = rootPanel.transform:Find("Panel_BtnContent").gameObject
        local currentItem       = panelBtnContent.transform:Find("Btn_" .. nCurrentItemIndex).gameObject

        currentItem.transform.localScale = CS.UnityEngine.Vector3(CURRENT_ITEM_SCALE, CURRENT_ITEM_SCALE, 1)
        return
    end

    if lastSelectedObj
        and not lastSelectedObj:Equals(nil)
        and lastSelectedObj.transform:CompareTag("CommonUtilsMenu")
        and selected and selected.transform:CompareTag("CommonUtilsMenu")
    then
        lastSelectedObj.transform.localScale = CS.UnityEngine.Vector3.one

        local eventManager = require('Base/ZEventDispatchCenter.lua')
        eventManager:DispatchEvent(eventManager.EventType.COMMON_UI_NAVIGATOR_ANIM, selected)
        return
    end

    if selected
        and not selected:Equals(nil)
        and selected.transform:CompareTag("CommonUtilsMenu")
        and selected.transform.name == "Btn_" .. nCurrentItemIndex then
        local eventManager = require('Base/ZEventDispatchCenter.lua')
        eventManager:DispatchEvent(eventManager.EventType.COMMON_UI_NAVIGATOR_ANIM, selected)
        return
    end
end

local function RefreshUI()
    RefreshBtnItem()
    RefreshBtnBoxUI()
    RefreshCurrentItemUI()
end

local function InitData()
end

local function UnInitData()
    SetCache("MENU_SHOW_ITEM_COUNT", nil)
    SetCache("MENU_SCROLL", nil)
end

local function RegisterEvent()
    local eventManager = require('Base/ZEventDispatchCenter.lua')

    eventManager:RegisterEvent(eventManager.EventType.COMMON_SELECT_BUTTON, OnChangeSelectButton)
    eventManager:RegisterEvent(eventManager.EventType.COMMON_UI_NAVIGATOR_SELECT_MENU, OnSelectMenu)
end

local function UnregisterEvent()
    local eventManager = require('Base/ZEventDispatchCenter.lua')

    eventManager:UnregisterEvent(eventManager.EventType.COMMON_UI_NAVIGATOR_SELECT_MENU, OnSelectMenu)
    eventManager:UnregisterEvent(eventManager.EventType.COMMON_SELECT_BUTTON, OnChangeSelectButton)
end

function Menu.SetShowItemData(nShowItemDemo)
    SetCache("MENU_SHOW_ITEM_COUNT", nShowItemDemo)
end

function Menu.SetMenuScroll()
    SetCache("MENU_SCROLL", true)
end

function Menu.Awake(luaRoot)
    Menu.luaRoot = luaRoot
    Menu.rootPanel = luaRoot
end

function Menu.Start()
    InitData()
    RefreshUI()
    RegisterEvent()
end

function Menu.Update()
    CheckKeyDown()
    CheckMouseScroll()
    CheckGesture()
end

function Menu.OnDestroy()
    UnInitData()
    UnregisterEvent()

    CS.UnityEngine.GameObject.Destroy(Menu.rootPanel)
end

return Menu