local _, Cell = ...
local L = Cell.L
local F = Cell.funcs
local P = Cell.pixelPerfectFuncs

local Serializer = LibStub:GetLibrary("LibSerialize")
local LibDeflate = LibStub:GetLibrary("LibDeflate")
local deflateConfig = {level = 9}

local isImport, imported, exported = false, {}, ""

local importExportFrame, importBtn, title, textArea

local function DoImport(overwriteExisting)
    local name, layout = imported["name"], imported["data"]

    -- indicators
    local builtInFound = {}
    for i =  #layout["indicators"], 1, -1 do
        if layout["indicators"][i]["type"] == "built-in" then -- remove unsupported built-in
            local indicatorName = layout["indicators"][i]["indicatorName"]
            builtInFound[indicatorName] = true
            if not Cell.defaults.indicatorIndices[indicatorName] then
                tremove(layout["indicators"], i)
            end
        else -- remove invalid spells from custom indicators
            F.FilterInvalidSpells(layout["indicators"][i]["auras"])
        end
    end

    -- add missing indicators
    if F.Getn(builtInFound) ~= Cell.defaults.builtIns then
        for indicatorName, index in pairs(Cell.defaults.indicatorIndices) do
            if not builtInFound[indicatorName] then
                tinsert(layout["indicators"], index, Cell.defaults.layout.indicators[index])
            end
        end
    end

    -- texplore(imported.data)

    if overwriteExisting then
        --! overwrite if exists
        CellDB["layouts"][name] = layout
        Cell.Fire("LayoutImported", name)
        if importExportFrame then
            importExportFrame:Hide()
        end
    else
        --! create new
        local i = 2
        repeat
            name = imported["name"].." "..i
            i = i + 1
        until not CellDB["layouts"][name]

        CellDB["layouts"][name] = layout
        Cell.Fire("LayoutImported", name)
        if importExportFrame then
            importExportFrame:Hide()
        end
    end
    F.Print(L["Layout imported: %s."]:format(name))
end

local function CreateLayoutImportExportFrame()
    importExportFrame = CreateFrame("Frame", "CellOptionsFrame_LayoutsImportExport", Cell.frames.layoutsTab, "BackdropTemplate")
    importExportFrame:Hide()
    Cell.StylizeFrame(importExportFrame, nil, Cell.GetAccentColorTable())
    importExportFrame:EnableMouse(true)
    importExportFrame:SetFrameLevel(Cell.frames.layoutsTab:GetFrameLevel() + 50)
    P.Size(importExportFrame, 430, 170)
    importExportFrame:SetPoint("TOPLEFT", P.Scale(1), -100)

    if not Cell.frames.layoutsTab.mask then
        Cell.CreateMask(Cell.frames.layoutsTab, nil, {1, -1, -1, 1})
        Cell.frames.layoutsTab.mask:Hide()
    end

    -- close
    local closeBtn = Cell.CreateButton(importExportFrame, "×", "red", {18, 18}, false, false, "CELL_FONT_SPECIAL", "CELL_FONT_SPECIAL")
    closeBtn:SetPoint("TOPRIGHT", P.Scale(-5), P.Scale(-1))
    closeBtn:SetScript("OnClick", function() importExportFrame:Hide() end)

    -- import
    importBtn = Cell.CreateButton(importExportFrame, L["Import"], "green", {57, 18})
    importBtn:Hide()
    importBtn:SetPoint("TOPRIGHT", closeBtn, "TOPLEFT", P.Scale(1), 0)
    importBtn:SetScript("OnClick", function()
        -- lower frame level
        importExportFrame:SetFrameLevel(Cell.frames.layoutsTab:GetFrameLevel() + 20)

        if CellDB["layouts"][imported["name"]] then
            local text = L["Overwrite Layout"]..": "..(imported["name"] == "default" and _G.DEFAULT or imported["name"]).."?\n"..
                L["|cff1Aff1AYes|r - Overwrite"].."\n"..L["|cffff1A1ANo|r - Create New"]
            local popup = Cell.CreateConfirmPopup(Cell.frames.layoutsTab, 200, text, function(self)
                DoImport(true)
            end, function(self)
                DoImport(false)
            end, true)
            popup:SetPoint("TOPLEFT", importExportFrame, 117, -50)
            textArea.eb:ClearFocus()
        else
            DoImport(true)
        end
    end)

    -- title
    title = importExportFrame:CreateFontString(nil, "OVERLAY", "CELL_FONT_CLASS")
    title:SetPoint("TOPLEFT", 5, -5)

    -- textArea
    textArea = Cell.CreateScrollEditBox(importExportFrame, function(eb, userChanged)
        if userChanged then
            if isImport then
                imported = {}
                local text = eb:GetText()
                -- check
                local version, name, data = string.match(text, "^!CELL:(%d+):LAYOUT:(.+)!(.+)$")
                version = tonumber(version)

                if name and version and data then
                    if version >= Cell.MIN_LAYOUTS_VERSION then
                        local success
                        data = LibDeflate:DecodeForPrint(data) -- decode
                        success, data = pcall(LibDeflate.DecompressDeflate, LibDeflate, data) -- decompress
                        success, data = Serializer:Deserialize(data) -- deserialize

                        if success and data then
                            title:SetText(L["Import"]..": "..(name == "default" and _G.DEFAULT or name))
                            importBtn:SetEnabled(true)
                            imported["name"] = name
                            imported["data"] = data
                        else
                            title:SetText(L["Import"]..": |cffff2222"..L["Error"])
                            importBtn:SetEnabled(false)
                        end
                    else -- incompatible version
                        title:SetText(L["Import"]..": |cffff2222"..L["Incompatible Version"])
                        importBtn:SetEnabled(false)
                    end
                else
                    title:SetText(L["Import"]..": |cffff2222"..L["Error"])
                    importBtn:SetEnabled(false)
                end
            else
                eb:SetText(exported)
                eb:SetCursorPosition(0)
                eb:HighlightText()
            end
        end
    end)
    Cell.StylizeFrame(textArea.scrollFrame, {0, 0, 0, 0}, Cell.GetAccentColorTable())
    textArea:SetPoint("TOPLEFT", P.Scale(5), P.Scale(-20))
    textArea:SetPoint("BOTTOMRIGHT", P.Scale(-5), P.Scale(5))

    -- highlight text
    textArea.eb:SetScript("OnEditFocusGained", function() textArea.eb:HighlightText() end)
    textArea.eb:SetScript("OnMouseUp", function()
        if not isImport then
            textArea.eb:HighlightText()
        end
    end)

    importExportFrame:SetScript("OnHide", function()
        importExportFrame:Hide()
        isImport = false
        exported = ""
        imported = {}
        -- hide mask
        Cell.frames.layoutsTab.mask:Hide()
    end)

    importExportFrame:SetScript("OnShow", function()
        -- raise frame level
        importExportFrame:SetFrameLevel(Cell.frames.layoutsTab:GetFrameLevel() + 50)
        Cell.frames.layoutsTab.mask:Show()
    end)
end

local init
function F.ShowLayoutImportFrame()
    if not init then
        init = true
        CreateLayoutImportExportFrame()
    end

    importExportFrame:Show()
    isImport = true
    importBtn:Show()
    importBtn:SetEnabled(false)

    exported = ""
    title:SetText(L["Import"])
    textArea:SetText("")
    textArea.eb:SetFocus(true)
end

function F.ShowLayoutExportFrame(layoutName, layoutTable)
    if not init then
        init = true
        CreateLayoutImportExportFrame()
    end

    importExportFrame:Show()
    isImport = false
    importBtn:Hide()

    title:SetText(L["Export"]..": "..(layoutName == "default" and _G.DEFAULT or layoutName))

    local prefix = "!CELL:"..Cell.versionNum..":LAYOUT:"..layoutName.."!"

    exported = Serializer:Serialize(layoutTable) -- serialize
    exported = LibDeflate:CompressDeflate(exported, deflateConfig) -- compress
    exported = LibDeflate:EncodeForPrint(exported) -- encode
    exported = prefix..exported

    textArea:SetText(exported)
    textArea.eb:SetFocus(true)
end

---------------------------------------------------------------------
-- for "installer" addons
---------------------------------------------------------------------

---@param layoutString string
---@param overwriteExisting boolean whether to overwrite existing layout with the same name
---@return boolean success
function Cell.ImportLayout(layoutString, overwriteExisting)
    local version, name, data = string.match(layoutString, "^!CELL:(%d+):LAYOUT:(.+)!(.+)$")
    version = tonumber(version)

    if name and version and data then
        if version >= Cell.MIN_LAYOUTS_VERSION then
            local success
            data = LibDeflate:DecodeForPrint(data) -- decode
            success, data = pcall(LibDeflate.DecompressDeflate, LibDeflate, data) -- decompress
            success, data = Serializer:Deserialize(data) -- deserialize

            if success and data then
                imported = {}
                imported["name"] = name
                imported["data"] = data
                DoImport(overwriteExisting)
                return true
            end
        end
    end

    return false
end