local DONATION_URL = nil
local GAME_SHOP_CODE = 201

local categories = {}
local offers = {}
local history = {}

local gameShopWindow = nil
local selected = nil
local selectedOffer = nil
local changeNameWindow = nil
local msgWindow = nil
local transferWindow = nil

local premiumPoints = 0
local premiumSecondPoints = -1

local CATEGORY_NONE = -1
local CATEGORY_PREMIUM = 0
local CATEGORY_ITEM = 1
local CATEGORY_BLESSING = 2
local CATEGORY_OUTFIT = 3
local CATEGORY_MOUNT = 4
local CATEGORY_EXTRAS = 5

local searchResultCategoryId = "Search Results"

function init()
    connect(
        g_game,
        {
            onGameStart = create,
            onGameEnd = destroy
        }
    )

    ProtocolGame.registerExtendedOpcode(GAME_SHOP_CODE, onExtendedOpcode)
    if g_game.isOnline() then
        create()
    end
end

function terminate()
    disconnect(
        g_game,
        {
            onGameStart = create,
            onGameEnd = destroy
        }
    )

    ProtocolGame.unregisterExtendedOpcode(GAME_SHOP_CODE, onExtendedOpcode)
    destroy()
end

function onExtendedOpcode(protocol, code, buffer)
    local json_status, json_data =
        pcall(
        function()
            return json.decode(buffer)
        end
    )
    if not json_status then
        g_logger.error("SHOP json error: " .. json_data)
        return false
    end

    local action = json_data["action"]
    local data = json_data["data"]
    if not action or not data then
        return false
    end

    if action == "fetchBase" then
        onGameShopFetchBase(data)
    elseif action == "fetchOffers" then
        onGameShopFetchOffers(data)
    elseif action == "fetchDescription" then
        onGameShopFetchDescription(data)
    elseif action == "points" then
        onGameShopUpdatePoints(data)
    elseif action == "history" then
        onGameShopUpdateHistory(data)
    elseif action == "msg" then
        onGameShopMsg(data)
    end
end

function create()
    if gameShopWindow then
        return
    end
    gameShopWindow = g_ui.displayUI("game_shop")
    gameShopWindow:hide()

    local protocolGame = g_game.getProtocolGame()
    if protocolGame then
        protocolGame:sendExtendedOpcode(GAME_SHOP_CODE, json.encode({action = "fetch", data = {}}))
    end
    createTransferWindow()
end

function destroy()
    if gameShopWindow then
        gameShopWindow:destroy()
        gameShopWindow = nil
    end

    if msgWindow then
        msgWindow:destroy()
        msgWindow = nil
    end

    if changeNameWindow then
        changeNameWindow:destroy()
        changeNameWindow = nil
    end

    if transferWindow then
        transferWindow:destroy()
        transferWindow = nil
    end

    selected = nil
    selectedOffer = nil
end

function onGameShopFetchBase(data)
    for i = 1, #data.categories do
        addCategory(data.categories[i])
    end

    DONATION_URL = data.url
end

function hideTransferWindow()
    if transferWindow then
        transferWindow:hide()
    end
end

function show()
    hideTransferWindow()
    if not gameShopWindow then
        return
    end

    hideHistory()
    gameShopWindow:show()
    gameShopWindow:raise()
    gameShopWindow:focus()
end

function hide()
    hideTransferWindow()
    if gameShopWindow then
        gameShopWindow:hide()
    end
end

function showHistory()
    deselect()
    gameShopWindow:getChildById("offers"):hide()
    gameShopWindow:getChildById("history"):show()
end

function hideHistory()
    gameShopWindow:getChildById("offers"):show()
    gameShopWindow:getChildById("history"):hide()
end

local entriesPerPage = 25
local currentPage = 1
local totalPages = 1

function updateHistory()
    local historyPanel = gameShopWindow:getChildById("history")
    local historyList = historyPanel:getChildById("list")
    historyList:destroyChildren()

    local index = ((currentPage - 1) * entriesPerPage) + 1
    for i = index, math.min(#history, index + entriesPerPage - 1) do
        local widget = g_ui.createWidget("HistoryWidget", historyList)
        widget:getChildById("date"):setText(history[i].date)
        widget:getChildById("price"):setText((history[i].price > 0 and "+" or "") .. comma_value(history[i].price))
        widget:getChildById("price"):setOn(history[i].price > 0)
        widget:getChildById("coin"):setOn(history[i].isSecondPrice)
        widget:getChildById("description"):setText(history[i].name)
    end

    historyPanel:getChildById("pageLabel"):setText("Page " .. currentPage .. "/" .. totalPages)
end

function onGameShopUpdateHistory(historyList)
    currentPage = 1
    history = historyList
    totalPages = math.max(1, math.ceil(#history / entriesPerPage))

    local historyPanel = gameShopWindow:getChildById("history")
    updateHistory()
    historyPanel:getChildById("nextPageButton"):setVisible(totalPages > 1)
end

function prevPage()
    if currentPage == 1 then
        return true
    end

    currentPage = currentPage - 1

    local historyPanel = gameShopWindow:getChildById("history")
    updateHistory()

    historyPanel:getChildById("nextPageButton"):setVisible(currentPage < totalPages)
    historyPanel:getChildById("prevPageButton"):setVisible(currentPage > 1)
end

function nextPage()
    if currentPage == totalPages then
        return true
    end

    currentPage = currentPage + 1

    local historyPanel = gameShopWindow:getChildById("history")
    updateHistory()

    historyPanel:getChildById("nextPageButton"):setVisible(currentPage < totalPages)
    historyPanel:getChildById("prevPageButton"):setVisible(currentPage > 1)
end

function deselect()
    if selected then
        selected:getChildById("button"):setChecked(false)
        local arrow = selected:getChildById("selectArrow")
        if arrow then
            arrow:hide()
        end

        if not selected:getChildById("subCategories") then
            selected = selected:getParent():getParent()
            selected:getChildById("expandArrow"):show()
        end

        selected:setHeight(22)
        selected:getChildById("subCategories"):hide()
    end
end

function comma_value(n)
    local left, num, right = string.match(n, "^([^%d]*%d)(%d*)(.-)$")
    return left .. (num:reverse():gsub("(%d%d%d)", "%1,"):reverse()) .. right
end

function buyPoints()
    g_platform.openUrl(DONATION_URL)
end

function onGameShopFetchOffers(data)
    offers[data.category] = data.offers
    if not selected and data.category == "Premium Time" then
        select(gameShopWindow:getChildById("categoriesList"):getChildren()[1]:getChildById("button"))
    end
end

function addCategory(data)
    categories[data.title] = data
    local categoriesList = gameShopWindow:getChildById("categoriesList")
    local category
    if data.parent then
        local parentPanel = categoriesList:getChildById(data.parent)
        category = g_ui.createWidget("ShopSubCategory", parentPanel:getChildById("subCategories"))
        parentPanel:getChildById("expandArrow"):show()
    else
        category = g_ui.createWidget("ShopCategory", categoriesList)
    end

    category:setId(data.title)
    category:getChildById("button"):setIconClip(data.iconId * 13 .. " 0 13 13")
    category:getChildById("name"):setText(data.title)
end

function onGameShopUpdatePoints(data)
    premiumPoints = tonumber(data.points)
    premiumSecondPoints = tonumber(data.secondPoints)
    local pointsWidget = gameShopWindow:getChildById("balance"):getChildById("value")
    pointsWidget:setText(comma_value(premiumPoints))

    local balanceSecondWidget = gameShopWindow:getChildById("balanceSecond")
    if premiumSecondPoints ~= -1 then
        balanceSecondWidget:getChildById("value"):setText(comma_value(premiumSecondPoints))
        balanceSecondWidget:show()
        balanceSecondWidget:setWidth(105)
        balanceSecondWidget:setMarginLeft(6)
        transferWindow.taskPointsLabelCoin:show()
        transferWindow.taskPointsAmountScrollbar:show()
        transferWindow.taskPointsCoin:show()
        transferWindow.taskPointsBalance:show()
        transferWindow.taskPointsBalance:setText(tr("Transferable Task points: ") .. comma_value(premiumSecondPoints))
        transferWindow.taskPointsAmountScrollbar:setMaximum(premiumSecondPoints)
    else
        balanceSecondWidget:hide()
        balanceSecondWidget:setWidth(1)
        balanceSecondWidget:setMarginLeft(0)
        transferWindow.taskPointsBalance:hide()
        transferWindow.taskPointsAmountLabel:hide()
        transferWindow.taskPointsLabelCoin:hide()
        transferWindow.taskPointsAmountScrollbar:hide()
        transferWindow.taskPointsCoin:hide()
    end

    transferWindow.coinsBalance:setText(tr("Transferable Tibia Coins: ") .. comma_value(premiumPoints))
    transferWindow.coinsAmountScrollbar:setMaximum(premiumPoints)
end

function select(self, ignoreSearch)
    hideHistory()
    if not ignoreSearch then
        eraseSearchResults()
    end

    local selfParent = self:getParent()
    local panel = selfParent:getChildById("subCategories")
    if panel then
        deselect()
        selected = selfParent

        if panel:getChildCount() > 0 then
            panel:show()
            selfParent:setHeight((panel:getChildCount() + 1) * 22)
            selfParent:getChildById("expandArrow"):hide()
            select(panel:getChildren()[1]:getChildById("button"))
        else
            self:setChecked(true)
        end
    else
        if selected then
            selected:getChildById("button"):setChecked(false)

            local arrow = selected:getChildById("selectArrow")
            if arrow then
                arrow:hide()
            end
        end

        selected = selfParent

        self:setChecked(true)
        selfParent:getChildById("selectArrow"):show()
    end

    showOffers(selfParent:getId())
end

function selectOffer(self)
    if selectedOffer then
        selectedOffer:setChecked(false)
    end

    self:setChecked(true)
    selectedOffer = self
    
    if not selectedOffer.categoryId then
        selectedOffer.categoryId = selected:getId()
    end

    updateDescription(self)
end

function showOffers(id)
    local offersCache = offers[id]
    if not offersCache then
        return
    end

    local currentOutfit = g_game.getLocalPlayer():getOutfit()
    local offersPanel = gameShopWindow:getChildById("offers")
    local offersList = offersPanel:getChildById("offersList")
    offersList:destroyChildren()

    for i = 1, #offersCache do
        local widget = offersList:getChildById(offersCache[i].name)
        local price = offersCache[i].price
        if widget then
            local additionalPriceWidget = widget:getChildById("additionalPrice")
            additionalPriceWidget:getChildById("coin"):setOn(offersCache[i].isSecondPrice)
            additionalPriceWidget:getChildById("value"):setText(comma_value(price))
            additionalPriceWidget:show()

            local additionalCountWidget = widget:getChildById("additionalCount")
            additionalCountWidget:setText(offersCache[i].count .. "x")
            additionalCountWidget:show()

            widget:getChildById("count"):show()
            widget.additionalPriceValue = price
            widget.additionalIsSecondPrice = isSecondPrice
            widget.additionalCountValue = offersCache[i].count

            if i == 2 then
                selectOffer(widget)
            end
        else
            local widget = g_ui.createWidget("OfferWidget", offersList)
            local priceWidget = widget:getChildById("price")
            priceWidget:getChildById("coin"):setOn(offersCache[i].isSecondPrice)
            priceWidget:getChildById("value"):setText(comma_value(price))

            widget:getChildById("name"):setText(offersCache[i].name)
            widget:getChildById("count"):setText(offersCache[i].count .. "x")
            widget:setId(offersCache[i].name)
            widget.data = offersCache[i]
            widget.categoryId = id

            local imagePanel = widget:getChildById("imagePanel")
            local image = imagePanel:getChildById("image")
            local categoryId = offersCache[i].categoryId
            local item = imagePanel:getChildById("item")
            local outfit = imagePanel:getChildById("outfit")
            local mount = imagePanel:getChildById("mount")

            if type(offersCache[i].id) == "string" then
                image:show()
                image:setImageSource("/game_shop/images/" .. offersCache[i].id)
            elseif type(offersCache[i].id) == "number" then
                widget.offerCategoryId = categoryId
                if categoryId == CATEGORY_ITEM then
                    item:show()
                    item:setItemId(offersCache[i].id)
                    widget:getChildById("count"):show()
                elseif categoryId == CATEGORY_OUTFIT then
                    currentOutfit.type = offersCache[i].id
                    outfit:show()
                    outfit:setOutfit(currentOutfit)
                elseif categoryId == CATEGORY_MOUNT then
                    mount:show()
                    mount:setOutfit({type = offersCache[i].id})
                elseif categoryId == CATEGORY_EXTRAS then
                    item:show()
                    item:setItemId(offersCache[i].id)
                end
            end

            if i == 1 then
                selectOffer(widget)
            end
        end
    end
end

function updateDescription(self)
    local offersPanel = gameShopWindow:getChildById("offers")
    local offerDetails = offersPanel:getChildById("offerDetails")
    offerDetails:show()
    offerDetails:getChildById("name"):setText(self.data.name)

    local descriptionPanel = offerDetails:getChildById("description")
    local widget = descriptionPanel:getChildren()[1]
    if not widget then
        widget = g_ui.createWidget("OfferDescriptionLabel", descriptionPanel)
    end

    local categoryToUse = self.data.originalCategory or self.categoryId
    if self.categoryId == searchResultCategoryId and not self.data.originalCategory then
        categoryToUse = self.data.parent
    end

    g_game.getProtocolGame():sendExtendedOpcode(
        GAME_SHOP_CODE,
        json.encode({
            action = "getDescription",
            data = {
                category = categoryToUse,
                name = self.data.name
            }
        })
    )

    local buyButton = offerDetails:getChildById("buyButton")
    local priceWidget = offerDetails:getChildById("price")
    local additionalBuyButton = offerDetails:getChildById("additionalBuyButton")
    local additionalPriceWidget = offerDetails:getChildById("additionalPrice")

    priceWidget:setOn(self.data.isSecondPrice)
    priceWidget:setText(comma_value(self.data.price))

    local globalPoints = self.data.isSecondPrice and premiumSecondPoints or premiumPoints
    priceWidget:setEnabled(self.data.price <= globalPoints)
    buyButton:setEnabled(self.data.price <= globalPoints)

    if self.additionalPriceValue and self.additionalCountValue then
        buyButton:setText("Buy " .. self.data.count)

        additionalPriceWidget:setEnabled(self.additionalPriceValue <= globalPoints)
        additionalBuyButton:setText("Buy " .. self.additionalCountValue)
        additionalBuyButton:show()
        additionalBuyButton:setEnabled(self.additionalPriceValue <= globalPoints)
        additionalBuyButton.price = self.additionalPriceValue
        additionalBuyButton.count = self.additionalCountValue
        buyButton.secondPrice = self.data.secondPrice
        buyButton.price = self.data.price
        buyButton.count = self.data.count

        additionalPriceWidget:setOn(self.data.isSecondPrice)
        additionalPriceWidget:setText(comma_value(self.additionalPriceValue))
        additionalPriceWidget:show()
    else
        additionalBuyButton:hide()

        buyButton.secondPrice = nil
        buyButton.price = nil
        buyButton.count = nil

        buyButton:setText("Buy")
        additionalPriceWidget:hide()
    end

    local currentOutfit = g_game.getLocalPlayer():getOutfit()
    local imagePanel = offerDetails:getChildById("imagePanel")
    local image = imagePanel:getChildById("image")
    local item = imagePanel:getChildById("item")
    local outfit = imagePanel:getChildById("outfit")
    local mount = imagePanel:getChildById("mount")
    image:hide()
    item:hide()
    outfit:hide()
    mount:hide()
    if type(self.data.id) == "string" then
        image:show()
        image:setImageSource("/game_shop/images/" .. self.data.id)
    elseif type(self.data.id) == "number" then
        local categoryId = self.offerCategoryId or self.data.offerCategoryId
        if table.contains({CATEGORY_ITEM, CATEGORY_EXTRAS}, categoryId) then
            item:show()
            item:setItemId(self.data.id)
        elseif categoryId == CATEGORY_OUTFIT then
            currentOutfit.type = self.data.id
            outfit:show()
            outfit:setOutfit(currentOutfit)
        elseif categoryId == CATEGORY_MOUNT then
            mount:show()
            mount:setOutfit({type = self.data.id})
        end
    end
end

function onGameShopFetchDescription(data)
    if not selectedOffer then
        return
    end
    
    if selectedOffer.data.name ~= data.name then
        return
    end
    
    if selectedOffer.categoryId == searchResultCategoryId and 
       data.category and selectedOffer.data.originalCategory and 
       data.category ~= selectedOffer.data.originalCategory then
        return
    end

    local offersPanel = gameShopWindow:getChildById("offers")
    local offerDetails = offersPanel:getChildById("offerDetails")
    local descriptionPanel = offerDetails:getChildById("description")
    local widget = descriptionPanel:getChildren()[1]
    if not widget then
        widget = g_ui.createWidget("OfferDescriptionLabel", descriptionPanel)
    end
    widget:setText(data.description)
end

function onOfferBuy(self)
    if not selectedOffer then
        displayInfoBox("Error", "Something went wrong, make sure to select category and offer.")
        return
    end

    hide()

    local title = "Purchase Confirmation"
    local msg
    if self.count and self.count > 1 then
        msg =
            "Do you want to buy " ..
            self.count .. "x " .. selectedOffer.data.name .. " for " .. comma_value(self.price) .. " points?"
    else
        msg =
            "Do you want to buy " ..
            selectedOffer.data.name .. " for " .. comma_value(selectedOffer.data.price) .. " points?"
    end

    if selectedOffer.data.name == "Name Change" then
        msgWindow =
            displayGeneralBox(
            title,
            msg,
            {
                {text = "Yes", callback = changeName},
                {text = "No", callback = buyCanceled},
                anchor = AnchorHorizontalCenter
            },
            changeName,
            buyCanceled
        )
    else
        msgWindow =
            displayGeneralBox(
            title,
            msg,
            {
                {text = "Yes", callback = buyConfirmed},
                {text = "No", callback = buyCanceled},
                anchor = AnchorHorizontalCenter
            },
            buyConfirmed,
            buyCanceled
        )
    end

    if self.count and self.count > 1 then
        msgWindow.count = self.count
        msgWindow.price = self.price
    else
        msgWindow.count = selectedOffer.data.count
        msgWindow.price = selectedOffer.data.price
    end
end

function buyConfirmed()
    local protocolGame = g_game.getProtocolGame()
    if protocolGame then
        protocolGame:sendExtendedOpcode(
            GAME_SHOP_CODE,
            json.encode(
                {
                    action = "purchase",
                    data = {
                        count = msgWindow.count,
                        price = msgWindow.price,
                        name = selectedOffer.data.name,
                        id = selectedOffer.data.id,
                        parent = selectedOffer.data.parent,
                        originalCategory = selectedOffer.data.originalCategory
                    }
                }
            )
        )
    end

    msgWindow:destroy()
    msgWindow = nil
end

function buyCanceled()
    msgWindow:destroy()
    msgWindow = nil
    show()
end

function changeName()
    msgWindow:destroy()
    msgWindow = nil
    if changeNameWindow then
        return
    end

    changeNameWindow = g_ui.displayUI("changename")
end

function confirmChangeName()
    local protocolGame = g_game.getProtocolGame()
    if protocolGame then
        protocolGame:sendExtendedOpcode(
            GAME_SHOP_CODE,
            json.encode(
                {
                    action = "purchase",
                    data = {
                        count = selectedOffer.data.count,
                        price = selectedOffer.data.price,
                        name = selectedOffer.data.name,
                        id = selectedOffer.data.id,
                        parent = selectedOffer.data.parent,
                        nick = changeNameWindow:getChildById("targetName"):getText()
                    }
                }
            )
        )

        changeNameWindow:destroy()
        changeNameWindow = nil
    end
end

function cancelChangeName()
    changeNameWindow:destroy()
    changeNameWindow = nil
end

function onGameShopMsg(data)
    local type = data.type
    local text = data.msg

    local title = nil
    local close = false
    if type == "info" then
        title = "Store Information"
        close = data.close
    elseif type == "error" then
        title = "Store Error"
        close = true
    end

    if close then
        hideHistory()
        hide()
    end

    displayInfoBoxWithCallback(
        title,
        text,
        {{text = "Ok", callback = defaultCallback}},
        function()
            show()
        end
    )
end

function displayInfoBoxWithCallback(title, message, callback)
    local messageBox
    local defaultCallback = function()
        if callback then
            show()
        end
        messageBox:ok()
    end

    messageBox =
        UIMessageBox.display(
        title,
        message,
        {{text = "Ok", callback = defaultCallback}},
        defaultCallback,
        defaultCallback
    )
    return messageBox
end

function changeCoinsAmount(value)
    transferWindow:getChildById("coinsAmountLabel"):setText("Amount to gift: " .. comma_value(value))
end

function changeTaskPointsAmount(value)
    transferWindow:getChildById("taskPointsAmountLabel"):setText("Amount to gift: " .. comma_value(value))
end

function confirmGiftCoins()
    if not transferWindow then
        return
    end

    local protocolGame = g_game.getProtocolGame()
    if protocolGame then
        protocolGame:sendExtendedOpcode(
            GAME_SHOP_CODE,
            json.encode(
                {
                    action = "transfer",
                    data = {
                        amount = tonumber(transferWindow.coinsAmountScrollbar:getValue()),
                        amountSecond = tonumber(transferWindow.taskPointsAmountScrollbar:getValue()),
                        target = transferWindow.recipient:getText()
                    }
                }
            )
        )
        transferWindow.recipient:setText("")
        transferWindow.coinsAmountScrollbar:setValue(0)
        transferWindow.taskPointsAmountScrollbar:setValue(0)
    end
end

function cancelGiftCoins()
    if transferWindow then
        transferWindow:hide()
        show()
    end
end

function createTransferWindow()
    if not transferWindow then
        transferWindow = g_ui.displayUI("giftcoins")
        transferWindow:hide()
    end
end

function toggle()
    if not gameShopWindow then
        return
    end

    if gameShopWindow:isVisible() then
        return hide()
    end

    show()
end

function toggleGiftCoins()
    if transferWindow then
        hide()
        transferWindow:show()
        transferWindow:raise()
        transferWindow:focus()
        transferWindow:setOn(premiumSecondPoints ~= -1)
    end
end

function onTypeSearch(self)
    gameShopWindow:getChildById("searchButton"):setEnabled(#self:getText() > 2)
end

function eraseSearchResults()
    local widget = gameShopWindow:getChildById("categoriesList"):getChildById(searchResultCategoryId)
    if widget then
        if selected == widget then
            selected = nil
        end
        widget:destroy()
    end
end

function onSearch()
    local searchTextEdit = gameShopWindow:getChildById("searchTextEdit")
    local text = searchTextEdit:getText()

    if #text < 3 then
        return
    end

    eraseSearchResults()
    addCategory(
        {
            title = searchResultCategoryId,
            iconId = 7,
            categoryId = CATEGORY_NONE
        }
    )

    offers[searchResultCategoryId] = {}
    local results = {}
    local searchTerm = text:lower()

    for categoryId, offerData in pairs(offers) do
        if categoryId ~= searchResultCategoryId then
            for _, offer in pairs(offerData) do
                if string.find(offer.name:lower(), searchTerm) then
                    local offerCopy = table.copy(offer)
                    offerCopy.originalCategory = categoryId
                    offerCopy.offerCategoryId = offer.categoryId
                    table.insert(results, offerCopy)
                end
            end
        end
    end

    for _, offer in ipairs(results) do
        table.insert(offers[searchResultCategoryId], offer)
    end

    local children = gameShopWindow:getChildById("categoriesList"):getChildren()
    select(children[#children]:getChildById("button"), true)
    searchTextEdit:clearText()
end