--////////////////////////////// Methods
--//////////////////////////////////////
local methods = {}
methods.__index = methods

function methods:AddChannel(channelName, autoJoin)
	if (self.ChatChannels[channelName:lower()]) then
		error(string.format("Channel %q alrady exists.", channelName))
	end

	local function DefaultChannelCommands(fromSpeaker, message)
		if (message:lower() == "/leave") then
			local channel = self:GetChannel(channelName)
			local speaker = self:GetSpeaker(fromSpeaker)
			if (channel and speaker) then
				if (channel.Leavable) then
					speaker:LeaveChannel(channelName)
					speaker:SendSystemMessage(
						string.gsub(
							ChatLocalization:Get(
								"GameChat_ChatService_YouHaveLeftChannel",
								string.format("You have left channel '%s'", channelName)
							),
						"{RBX_NAME}",channelName),
						"System"
					)
				else
					speaker:SendSystemMessage(ChatLocalization:Get("GameChat_ChatService_CannotLeaveChannel","You cannot leave this channel."), channelName)
				end
			end

			return true
		end
		return false
	end


	local channel = ChatChannel.new(self, channelName)
	self.ChatChannels[channelName:lower()] = channel

	channel:RegisterProcessCommandsFunction("default_commands", DefaultChannelCommands, ChatConstants.HighPriority)

	local success, err = pcall(function() self.eChannelAdded:Fire(channelName) end)
	if not success and err then
		print("Error addding channel: " ..err)
	end

	if autoJoin ~= nil then
		channel.AutoJoin = autoJoin
		if autoJoin then
			for _, speaker in pairs(self.Speakers) do
				speaker:JoinChannel(channelName)
			end
		end
	end

	return channel
end

function methods:RemoveChannel(channelName)
	if (self.ChatChannels[channelName:lower()]) then
		local n = self.ChatChannels[channelName:lower()].Name

		self.ChatChannels[channelName:lower()]:InternalDestroy()
		self.ChatChannels[channelName:lower()] = nil

		local success, err = pcall(function() self.eChannelRemoved:Fire(n) end)
		if not success and err then
			print("Error removing channel: " ..err)
		end
	else
		warn(string.format("Channel %q does not exist.", channelName))
	end
end

function methods:GetChannel(channelName)
	return self.ChatChannels[channelName:lower()]
end


function methods:AddSpeaker(speakerName)
	if (self.Speakers[speakerName:lower()]) then
		error("Speaker \"" .. speakerName .. "\" already exists!")
	end

	local speaker = Speaker.new(self, speakerName)
	self.Speakers[speakerName:lower()] = speaker

	local success, err = pcall(function() self.eSpeakerAdded:Fire(speakerName) end)
	if not success and err then
		print("Error adding speaker: " ..err)
	end

	return speaker
end

function methods:InternalUnmuteSpeaker(speakerName)
	for channelName, channel in pairs(self.ChatChannels) do
		if channel:IsSpeakerMuted(speakerName) then
			channel:UnmuteSpeaker(speakerName)
		end
	end
end

function methods:RemoveSpeaker(speakerName)
	if (self.Speakers[speakerName:lower()]) then
		local n = self.Speakers[speakerName:lower()].Name
		self:InternalUnmuteSpeaker(n)

		self.Speakers[speakerName:lower()]:InternalDestroy()
		self.Speakers[speakerName:lower()] = nil

		local success, err = pcall(function() self.eSpeakerRemoved:Fire(n) end)
		if not success and err then
			print("Error removing speaker: " ..err)
		end

	else
		warn("Speaker \"" .. speakerName .. "\" does not exist!")
	end
end

function methods:GetSpeaker(speakerName)
	return self.Speakers[speakerName:lower()]
end

function methods:GetChannelList()
	local list = {}
	for i, channel in pairs(self.ChatChannels) do
		if (not channel.Private) then
			table.insert(list, channel.Name)
		end
	end
	return list
end

function methods:GetAutoJoinChannelList()
	local list = {}
	for i, channel in pairs(self.ChatChannels) do
		if channel.AutoJoin then
			table.insert(list, channel)
		end
	end
	return list
end

function methods:GetSpeakerList()
	local list = {}
	for i, speaker in pairs(self.Speakers) do
		table.insert(list, speaker.Name)
	end
	return list
end

function methods:SendGlobalSystemMessage(message)
	for i, speaker in pairs(self.Speakers) do
		speaker:SendSystemMessage(message, nil)
	end
end

function methods:RegisterFilterMessageFunction(funcId, func, priority)
	if self.FilterMessageFunctions:HasFunction(funcId) then
		error(string.format("FilterMessageFunction '%s' already exists", funcId))
	end
	self.FilterMessageFunctions:AddFunction(funcId, func, priority)
end

function methods:FilterMessageFunctionExists(funcId)
	return self.FilterMessageFunctions:HasFunction(funcId)
end

function methods:UnregisterFilterMessageFunction(funcId)
	if not self.FilterMessageFunctions:HasFunction(funcId) then
		error(string.format("FilterMessageFunction '%s' does not exists", funcId))
	end
	self.FilterMessageFunctions:RemoveFunction(funcId)
end

function methods:RegisterProcessCommandsFunction(funcId, func, priority)
	if self.ProcessCommandsFunctions:HasFunction(funcId) then
		error(string.format("ProcessCommandsFunction '%s' already exists", funcId))
	end
	self.ProcessCommandsFunctions:AddFunction(funcId, func, priority)
end

function methods:ProcessCommandsFunctionExists(funcId)
	return self.ProcessCommandsFunctions:HasFunction(funcId)
end

function methods:UnregisterProcessCommandsFunction(funcId)
	if not self.ProcessCommandsFunctions:HasFunction(funcId) then
		error(string.format("ProcessCommandsFunction '%s' does not exist", funcId))
	end
	self.ProcessCommandsFunctions:RemoveFunction(funcId)
end

local LastFilterNoficationTime = 0
local LastFilterIssueTime = 0
local FilterIssueCount = 0
function methods:InternalNotifyFilterIssue()
	if (tick() - LastFilterIssueTime) > FILTER_THRESHOLD_TIME then
		FilterIssueCount = 0
	end
	FilterIssueCount = FilterIssueCount + 1
	LastFilterIssueTime = tick()
	if FilterIssueCount >= FILTER_NOTIFCATION_THRESHOLD then
		if (tick() - LastFilterNoficationTime) > FILTER_NOTIFCATION_INTERVAL then
			LastFilterNoficationTime = tick()
			local systemChannel = self:GetChannel("System")
			if systemChannel then
				systemChannel:SendSystemMessage(
					ChatLocalization:Get(
						"GameChat_ChatService_ChatFilterIssues",
						"The chat filter is currently experiencing issues and messages may be slow to appear."
					),
					errorExtraData
				)
			end
		end
	end
end

local StudioMessageFilteredCache = {}