--///////////////// Internal-Use Methods
--//////////////////////////////////////

function methods:InternalDestroy()
	for i, speaker in pairs(self.Speakers) do
		speaker:LeaveChannel(self.Name)
	end

	self.eDestroyed:Fire()

	self.eDestroyed:Destroy()
	self.eMessagePosted:Destroy()
	self.eSpeakerJoined:Destroy()
	self.eSpeakerLeft:Destroy()
	self.eSpeakerMuted:Destroy()
	self.eSpeakerUnmuted:Destroy()
end

function methods:InternalDoMessageFilter(speakerName, messageObj, channel)
	local filtersIterator = self.FilterMessageFunctions:GetIterator()
	for funcId, func, priority in filtersIterator do
		local success, errorMessage = pcall(function()
			func(speakerName, messageObj, channel)
		end)

		if not success then
			warn(string.format("DoMessageFilter Function '%s' failed for reason: %s", funcId, errorMessage))
		end
	end
end

function methods:InternalDoProcessCommands(speakerName, message, channel)
	local commandsIterator = self.ProcessCommandsFunctions:GetIterator()
	for funcId, func, priority in commandsIterator do
		local success, returnValue = pcall(function()
			local ret = func(speakerName, message, channel)
			if type(ret) ~= "boolean" then
				error("Process command functions must return a bool")
			end
			return ret
		end)

		if not success then
			warn(string.format("DoProcessCommands Function '%s' failed for reason: %s", funcId, returnValue))
		elseif returnValue then
			return true
		end
	end

	return false
end

function methods:InternalPostMessage(fromSpeaker, message, extraData)
	if (self:InternalDoProcessCommands(fromSpeaker.Name, message, self.Name)) then return false end

	if (self.Mutes[fromSpeaker.Name:lower()] ~= nil) then
		local t = self.Mutes[fromSpeaker.Name:lower()]
		if (t > 0 and os.time() > t) then
			self:UnmuteSpeaker(fromSpeaker.Name)
		else
			self:SendSystemMessageToSpeaker(ChatLocalization:Get("GameChat_ChatChannel_MutedInChannel","You are muted and cannot talk in this channel"), fromSpeaker.Name)
			return false
		end
	end

	local messageObj = self:InternalCreateMessageObject(message, fromSpeaker.Name, false, extraData)
	message = self:SendMessageObjToFilters(message, messageObj, fromSpeaker)

	local sentToList = {}
	for i, speaker in pairs(self.Speakers) do
		local isMuted = speaker:IsSpeakerMuted(fromSpeaker.Name)
		if not isMuted and self:CanCommunicate(fromSpeaker, speaker) then
			table.insert(sentToList, speaker.Name)
			if speaker.Name == fromSpeaker.Name then
				-- Send unfiltered message to speaker who sent the message.
				local cMessageObj = DeepCopy(messageObj)
				cMessageObj.Message = message
				cMessageObj.IsFiltered = true
				-- We need to claim the message is filtered even if it not in this case for compatibility with legacy client side code.
				speaker:InternalSendMessage(cMessageObj, self.Name)
			else
				speaker:InternalSendMessage(messageObj, self.Name)
			end
		end
	end

	local success, err = pcall(function() self.eMessagePosted:Fire(messageObj) end)
	if not success and err then
		print("Error posting message: " ..err)
	end

	local filteredMessages = {}
	for i, speakerName in pairs(sentToList) do
		local filteredMessage = self.ChatService:InternalApplyRobloxFilter(messageObj.FromSpeaker, message, speakerName)
		if filteredMessage then
			filteredMessages[speakerName] = filteredMessage
		else
			return false
		end
	end

	for i, speakerName in pairs(sentToList) do
		local speaker = self.Speakers[speakerName]
		if (speaker) then
			local cMessageObj = DeepCopy(messageObj)
			cMessageObj.Message = filteredMessages[speakerName]
			cMessageObj.IsFiltered = true
			speaker:InternalSendFilteredMessage(cMessageObj, self.Name)
		end
	end

	local filteredMessage = self.ChatService:InternalApplyRobloxFilter(messageObj.FromSpeaker, message)
	if filteredMessage then
		messageObj.Message = filteredMessage
	else
		return false
	end
	messageObj.IsFiltered = true
	self:InternalAddMessageToHistoryLog(messageObj)

	-- One more pass is needed to ensure that no speakers do not recieve the message.
	-- Otherwise a user could join while the message is being filtered who had not originally been sent the message.
	local speakersMissingMessage = {}
	for _, speaker in pairs(self.Speakers) do
		local isMuted = speaker:IsSpeakerMuted(fromSpeaker.Name)
		if not isMuted and self:CanCommunicate(fromSpeaker, speaker) then
			local wasSentMessage = false
			for _, sentSpeakerName in pairs(sentToList) do
				if speaker.Name == sentSpeakerName then
					wasSentMessage = true
					break
				end
			end
			if not wasSentMessage then
				table.insert(speakersMissingMessage, speaker.Name)
			end
		end
	end

	for _, speakerName in pairs(speakersMissingMessage) do
		local speaker = self.Speakers[speakerName]
		if speaker then
			local filteredMessage = self.ChatService:InternalApplyRobloxFilter(messageObj.FromSpeaker, message, speakerName)
			if filteredMessage == nil then
				return false
			end
			local cMessageObj = DeepCopy(messageObj)
			cMessageObj.Message = filteredMessage
			cMessageObj.IsFiltered = true
			speaker:InternalSendFilteredMessage(cMessageObj, self.Name)
		end
	end

	return messageObj
end

function methods:InternalAddSpeaker(speaker)
	if (self.Speakers[speaker.Name]) then
		warn("Speaker \"" .. speaker.name .. "\" is already in the channel!")
		return
	end

	self.Speakers[speaker.Name] = speaker
	local success, err = pcall(function() self.eSpeakerJoined:Fire(speaker.Name) end)
	if not success and err then
		print("Error removing channel: " ..err)
	end
end

function methods:InternalRemoveSpeaker(speaker)
	if (not self.Speakers[speaker.Name]) then
		warn("Speaker \"" .. speaker.name .. "\" is not in the channel!")
		return
	end

	self.Speakers[speaker.Name] = nil
	local success, err = pcall(function() self.eSpeakerLeft:Fire(speaker.Name) end)
	if not success and err then
		print("Error removing speaker: " ..err)
	end
end

function methods:InternalRemoveExcessMessagesFromLog()
	local remove = table.remove
	while (#self.ChatHistory > self.MaxHistory) do
		remove(self.ChatHistory, 1)
	end
end

function methods:InternalAddMessageToHistoryLog(messageObj)
	table.insert(self.ChatHistory, messageObj)

	self:InternalRemoveExcessMessagesFromLog()
end

function methods:GetMessageType(message, fromSpeaker)
	if fromSpeaker == nil then
		return ChatConstants.MessageTypeSystem
	end
	return ChatConstants.MessageTypeDefault
end

function methods:InternalCreateMessageObject(message, fromSpeaker, isFiltered, extraData)
	local messageType = self:GetMessageType(message, fromSpeaker)

	local speakerUserId = -1
	local speaker = nil

	if fromSpeaker then
		speaker = self.Speakers[fromSpeaker]
		if speaker then
			local player = speaker:GetPlayer()
			if player then
				speakerUserId = player.UserId
			else
				speakerUserId = 0
			end
		end
	end

	local messageObj =
	{
		ID = self.ChatService:InternalGetUniqueMessageId(),
		FromSpeaker = fromSpeaker,
		SpeakerUserId = speakerUserId,
		OriginalChannel = self.Name,
		MessageLength = string.len(message),
		MessageType = messageType,
		IsFiltered = isFiltered,
		Message = isFiltered and message or nil,
		Time = os.time(),
		ExtraData = {},
	}

	if speaker then
		for k, v in pairs(speaker.ExtraData) do
			messageObj.ExtraData[k] = v
		end
	end

	if (extraData) then
		for k, v in pairs(extraData) do
			messageObj.ExtraData[k] = v
		end
	end

	return messageObj
end

function methods:SetChannelNameColor(color)
	self.ChannelNameColor = color
	for i, speaker in pairs(self.Speakers) do
		speaker:UpdateChannelNameColor(self.Name, color)
	end
end

function methods:GetWelcomeMessageForSpeaker(speaker)
	if self.GetWelcomeMessageFunction then
		local welcomeMessage = self.GetWelcomeMessageFunction(speaker)
		if welcomeMessage then
			return welcomeMessage
		end
	end
	return self.WelcomeMessage
end

function methods:RegisterGetWelcomeMessageFunction(func)
	if type(func) ~= "function" then
		error("RegisterGetWelcomeMessageFunction must be called with a function.")
	end
	self.GetWelcomeMessageFunction = func
end

function methods:UnRegisterGetWelcomeMessageFunction()
	self.GetWelcomeMessageFunction = nil
end
