--[[
	// FileName: ChatSelector.lua
	// Written by: Xsitsu
	// Description: Code for determining which chat version to use in game.
]]
local FORCE_CorescriptNewLoadChat 	= false		-- Force FFLag on client to be true always
local FORCE_GetShouldUseLuaChat 	= false 	-- Force SFFlag value read from server to be true always

local FORCE_IS_CONSOLE = false
local FORCE_IS_VR = false


local CoreGuiService = game:GetService("CoreGui")
local RobloxGui = CoreGuiService:WaitForChild("RobloxGui")

local StarterGui = game:GetService("StarterGui")
local UserInputService = game:GetService("UserInputService")
local GuiService = game:GetService("GuiService")

local Players = game:GetService("Players")
while Players.LocalPlayer == nil do Players.ChildAdded:wait() end
local LocalPlayer = Players.LocalPlayer

local Util = require(RobloxGui.Modules.ChatUtil)

local function GetUseLuaFlag()
	local loop_continue = true
	while loop_continue do
		local success, retVal = pcall(function()
			return game.IsSFFlagsLoaded
		end)
		if not success then
			loop_continue = false
		elseif retVal then
			loop_continue = false
		else
			wait(0.1)
		end
	end

	local success, retVal = pcall(function() return game:GetService("Chat"):GetShouldUseLuaChat() end)
	local useNewChat = success and retVal
	return useNewChat
end

local readFlagSuccess, flagEnabled = pcall(function() return settings():GetFFlag("CorescriptNewLoadChat") end)
local TryLoadNewChat = readFlagSuccess and flagEnabled


local useModule = nil

local state = {Visible = true}
local interface = {}
do
	function interface:ToggleVisibility()
		if (useModule) then
			useModule:ToggleVisibility()
		else
			state.Visible = not state.Visible
		end
	end

	function interface:SetVisible(visible)
		if (useModule) then
			useModule:SetVisible(visible)
		else
			state.Visible = visible
		end
	end

	function interface:FocusChatBar()
		if (useModule) then
			useModule:FocusChatBar()
		end
	end

	function interface:GetVisibility()
		if (useModule) then
			return useModule:GetVisibility()
		else
			return state.Visible
		end
	end

	function interface:GetMessageCount()
		if (useModule) then
			return useModule:GetMessageCount()
		else
			return 0
		end
	end

	function interface:TopbarEnabledChanged(...)
		if (useModule) then
			return useModule:TopbarEnabledChanged(...)
		end
	end

	function interface:IsFocused(useWasFocused)
		if (useModule) then
			return useModule:IsFocused(useWasFocused)
		else
			return false
		end
	end

	interface.ChatBarFocusChanged = Util.Signal()
	interface.VisibilityStateChanged = Util.Signal()
	interface.MessagesChanged = Util.Signal()
end

local StopQueueingSystemMessages = false
local MakeSystemMessageQueue = {}
local function MakeSystemMessageQueueingFunction(data)
	if (StopQueueingSystemMessages) then return end
	table.insert(MakeSystemMessageQueue, data)
end

local function NonFunc() end
StarterGui:RegisterSetCore("ChatMakeSystemMessage", MakeSystemMessageQueueingFunction)
StarterGui:RegisterSetCore("ChatWindowPosition", NonFunc)
StarterGui:RegisterSetCore("ChatWindowSize", NonFunc)
StarterGui:RegisterGetCore("ChatWindowPosition", NonFunc)
StarterGui:RegisterGetCore("ChatWindowSize", NonFunc)
StarterGui:RegisterSetCore("ChatBarDisabled", NonFunc)
StarterGui:RegisterGetCore("ChatBarDisabled", NonFunc)


local function ConnectSignals(useModule, interface, sigName)
	--// "MessagesChanged" event is not created for Studio Start Server
	if (useModule[sigName]) then
		useModule[sigName]:connect(function(...) interface[sigName]:fire(...) end)
	end
end

local isConsole = GuiService:IsTenFootInterface() or FORCE_IS_CONSOLE
local isVR = UserInputService.VREnabled or FORCE_IS_VR

if ( (TryLoadNewChat or FORCE_CorescriptNewLoadChat) and not isConsole and not isVR ) then
	spawn(function()
		local useNewChat = GetUseLuaFlag() or FORCE_GetShouldUseLuaChat
		local useModuleScript = useNewChat and RobloxGui.Modules.NewChat or RobloxGui.Modules.Chat
		useModule = require(useModuleScript)

		ConnectSignals(useModule, interface, "ChatBarFocusChanged")
		ConnectSignals(useModule, interface, "VisibilityStateChanged")
		if (LocalPlayer.ChatMode == Enum.ChatMode.TextAndMenu) then
			ConnectSignals(useModule, interface, "MessagesChanged")
			StarterGui:RegisterGetCore("UseNewLuaChat", function() return useNewChat end)
		else
			--// Cause new chat window UI to not be created in Studio Start Server
			StarterGui:RegisterGetCore("UseNewLuaChat", function() return false end)
		end

		useModule:SetVisible(state.Visible)
		StarterGui:SetCoreGuiEnabled(Enum.CoreGuiType.Chat, StarterGui:GetCoreGuiEnabled(Enum.CoreGuiType.Chat))

		StopQueueingSystemMessages = true
		for i, messageData in pairs(MakeSystemMessageQueue) do
			pcall(function() StarterGui:SetCore("ChatMakeSystemMessage", messageData) end)
		end
	end)
else
	useModule = require(RobloxGui.Modules.Chat)

	ConnectSignals(useModule, interface, "ChatBarFocusChanged")
	ConnectSignals(useModule, interface, "VisibilityStateChanged")
	if (LocalPlayer.ChatMode == Enum.ChatMode.TextAndMenu) then
		ConnectSignals(useModule, interface, "MessagesChanged")
	end

	StarterGui:RegisterGetCore("UseNewLuaChat", function() return false end)
	
end

return interface