--////////////////////////////////////////////////////////////////////////////////////////////
--///////////// Code to talk to topbar and maintain set/get core backwards compatibility stuff
--////////////////////////////////////////////////////////////////////////////////////////////

local Util = {}
do
	function Util.Signal()
		local sig = {}

		local mSignaler = Instance.new('BindableEvent')

		local mArgData = nil
		local mArgDataCount = nil

		function sig:fire(...)
			mArgData = {...}
			mArgDataCount = select('#', ...)
			mSignaler:Fire()
		end

		function sig:connect(f)
			if not f then error("connect(nil)", 2) end
			return mSignaler.Event:connect(function()
				f(unpack(mArgData, 1, mArgDataCount))
			end)
		end

		function sig:wait()
			mSignaler.Event:wait()
			assert(mArgData, "Missing arg data, likely due to :TweenSize/Position corrupting threadrefs.")
			return unpack(mArgData, 1, mArgDataCount)
		end

		return sig
	end
end


function SetVisibility(val)
	ChatWindow:SetVisible(val)
	moduleApiTable.VisibilityStateChanged:fire(val)
	moduleApiTable.Visible = val

	if (moduleApiTable.IsCoreGuiEnabled) then
		if (val) then
			InstantFadeIn()
		else
			InstantFadeOut()
		end
	end
end

do
	moduleApiTable.TopbarEnabled = true
	moduleApiTable.MessageCount = 0
	moduleApiTable.Visible = true
	moduleApiTable.IsCoreGuiEnabled = true

	function moduleApiTable:ToggleVisibility()
		SetVisibility(not ChatWindow:GetVisible())
	end

	function moduleApiTable:SetVisible(visible)
		if (ChatWindow:GetVisible() ~= visible) then
			SetVisibility(visible)
		end
	end

	function moduleApiTable:FocusChatBar()
		ChatBar:CaptureFocus()
	end

	function moduleApiTable:EnterWhisperState(player)
		ChatBar:EnterWhisperState(player)
	end

	function moduleApiTable:GetVisibility()
		return ChatWindow:GetVisible()
	end

	function moduleApiTable:GetMessageCount()
		return self.MessageCount
	end

	function moduleApiTable:TopbarEnabledChanged(enabled)
		self.TopbarEnabled = enabled
		self.CoreGuiEnabled:fire(game:GetService("StarterGui"):GetCoreGuiEnabled(Enum.CoreGuiType.Chat))
	end

	function moduleApiTable:IsFocused(useWasFocused)
		return ChatBar:IsFocused()
	end

	moduleApiTable.ChatBarFocusChanged = Util.Signal()
	moduleApiTable.VisibilityStateChanged = Util.Signal()
	moduleApiTable.MessagesChanged = Util.Signal()


	moduleApiTable.MessagePosted = Util.Signal()
	moduleApiTable.CoreGuiEnabled = Util.Signal()

	moduleApiTable.ChatMakeSystemMessageEvent = Util.Signal()
	moduleApiTable.ChatWindowPositionEvent = Util.Signal()
	moduleApiTable.ChatWindowSizeEvent = Util.Signal()
	moduleApiTable.ChatBarDisabledEvent = Util.Signal()


	function moduleApiTable:fChatWindowPosition()
		return ChatWindow.GuiObject.Position
	end

	function moduleApiTable:fChatWindowSize()
		return ChatWindow.GuiObject.Size
	end

	function moduleApiTable:fChatBarDisabled()
		return not ChatBar:GetEnabled()
	end

	if FFlagUserHandleChatHotKeyWithContextActionService then
		local TOGGLE_CHAT_ACTION_NAME = "ToggleChat"

		-- Callback when chat hotkey is pressed
		local function handleAction(actionName, inputState, inputObject)
			if actionName == TOGGLE_CHAT_ACTION_NAME and inputState == Enum.UserInputState.Begin and canChat and inputObject.UserInputType == Enum.UserInputType.Keyboard then
				DoChatBarFocus()
			end
		end
		ContextActionService:BindAction(TOGGLE_CHAT_ACTION_NAME, handleAction, true, Enum.KeyCode.Slash)
	else
		function moduleApiTable:SpecialKeyPressed(key, modifiers)
			if (key == Enum.SpecialKey.ChatHotkey) then
				if canChat then
					DoChatBarFocus()
				end
			end
		end
	end
end

moduleApiTable.CoreGuiEnabled:connect(function(enabled)
	moduleApiTable.IsCoreGuiEnabled = enabled

	enabled = enabled and (moduleApiTable.TopbarEnabled or ChatSettings.ChatOnWithTopBarOff)

	ChatWindow:SetCoreGuiEnabled(enabled)

	if (not enabled) then
		ChatBar:ReleaseFocus()
		InstantFadeOut()
	else
		InstantFadeIn()
	end
end)

function trimTrailingSpaces(str)
	local lastSpace = #str
	while lastSpace > 0 do
		--- The pattern ^%s matches whitespace at the start of the string. (Starting from lastSpace)
		if str:find("^%s", lastSpace) then
			lastSpace = lastSpace - 1
		else
			break
		end
	end
	return str:sub(1, lastSpace)
end

moduleApiTable.ChatMakeSystemMessageEvent:connect(function(valueTable)
	if (valueTable["Text"] and type(valueTable["Text"]) == "string") then
		while (not DidFirstChannelsLoads) do wait() end

		local channel = ChatSettings.GeneralChannelName
		local channelObj = ChatWindow:GetChannel(channel)

		if (channelObj) then
			local messageObject = {
				ID = -1,
				FromSpeaker = nil,
				SpeakerUserId = 0,
				OriginalChannel = channel,
				IsFiltered = true,
				MessageLength = string.len(valueTable.Text),
				MessageLengthUtf8 = utf8.len(utf8.nfcnormalize(valueTable.Text)),
				Message = trimTrailingSpaces(valueTable.Text),
				MessageType = ChatConstants.MessageTypeSetCore,
				Time = os.time(),
				ExtraData = valueTable,
			}
			channelObj:AddMessageToChannel(messageObject)
			ChannelsBar:UpdateMessagePostedInChannel(channel)

			moduleApiTable.MessageCount = moduleApiTable.MessageCount + 1
			moduleApiTable.MessagesChanged:fire(moduleApiTable.MessageCount)
		end
	end
end)

moduleApiTable.ChatBarDisabledEvent:connect(function(disabled)
	if canChat then
		ChatBar:SetEnabled(not disabled)
		if (disabled) then
			ChatBar:ReleaseFocus()
		end
	end
end)

moduleApiTable.ChatWindowSizeEvent:connect(function(size)
	ChatWindow.GuiObject.Size = size
end)

moduleApiTable.ChatWindowPositionEvent:connect(function(position)
	ChatWindow.GuiObject.Position = position
end)
