local mod = Chatter:NewModule("Channel Names", "AceHook-3.0", "AceEvent-3.0")
local L = LibStub("AceLocale-3.0"):GetLocale("Chatter")
mod.modName = L["Channel Names"]

local gsub = _G.string.gsub
local find = _G.string.find
local pairs = _G.pairs
local loadstring = _G.loadstring
local tostring = _G.tostring
local GetChannelList = _G.GetChannelList
local select = _G.select

local empty_tag = L["$$EMPTY$$"];

local defaults = {
	profile = {
		channels = {
			[L["Guild"]] = "[G]",
			[L["Officer"]] = "[O]",
			[L["Party"]] = "[P]",
			[PARTY_LEADER] = "[PL]",
			[L["Dungeon Guide"]] = "[DG]",
			[L["Raid"]] = "[R]",
			[L["Raid Leader"]] = "[RL]",
			[L["Raid Warning"]] = "[RW]",
			[L["LookingForGroup"]] = "[LFG]",
			[L["Battleground"]] = "[BG]",
			[L["Battleground Leader"]] = "[BL]",
			-- Not localized here intentionally
			["Whisper From"] = "[W:From]",
			["Whisper To"] = "[W:To]",
			["BN Whisper From"] = "[BN:From]",
			["BN Whisper To"] = "[BN:To]",
			["away BN Whisper To"] = "<Away>[BN:To]",
			["busy BN Whisper To"] = "<Busy>[BN:To]"
		},
		addSpace = true
	}	
}

local channels

local options = {
	splitter = {
		type = "header",
		name = L["Custom Channels"]
	},
	addSpace = {
		type = "toggle",
		name = L["Add space after channels"],
		desc = L["Add space after channels"],
		get = function() return mod.db.profile.addSpace end,
		set = function(info, v) mod.db.profile.addSpace = v end
	}
}

local serverChannels = {}
local function excludeChannels(...)
	for i = 1, select("#", ...) do
		local name = select(i, ...)
		serverChannels[name] = true
	end
end
local functions = {}

local function addChannel(name)
	options[name:gsub(" ", "_")] = {
		type = "input",
		name = name,
		desc = L["Replace this channel name with..."],
		order = name:lower() == name and 101 or 98,
		get = function()
			local v = mod.db.profile.channels[name]
			return v == "" and " " or v
		end,
		set = function(info, v)
			mod.db.profile.channels[name] = #v > 0 and v or nil
			if v:match("^function%(") then
				functions[name] = loadstring("return " .. v)()
			else
				functions[name] = nil
			end
		end
	}
end

function mod:OnInitialize()
	self.db = Chatter.db:RegisterNamespace("ChannelNames", defaults)
	self.db.profile.customChannels = nil
	for k, _ in pairs(self.db.profile.channels) do
		addChannel(k)
	end
	excludeChannels(EnumerateServerChannels())
	for k, v in pairs(serverChannels) do
		addChannel(k)
	end	
	self:AddCustomChannels(GetChannelList())

	for k, v in pairs(self.db.profile.channels) do
		if v:match("^function%(") then
			functions[k] = loadstring("return " .. v)()
		end
	end
end

function mod:AddCustomChannels(...)
	for i = 1, select("#", ...), 2 do
		local id, name = select(i, ...)
		if not serverChannels[name] and not options[name:gsub(" ", "_")] then
			options[name:gsub(" ", "_")] = {
				type = "input",
				name = name,
				desc = L["Replace this channel name with..."],
				order = id <= 4 and 98 or 101,
				get = function()
					local v = self.db.profile.channels[name:lower()]
					return v == "" and " " or v
				end,
				set = function(info, v)
					self.db.profile.channels[name:lower()] = #v > 0 and v or nil
					if v:match("^function%(") then
						functions[name:lower()] = loadstring("return " .. v)()
					end
				end
			}
		end
	end
end

function mod:Decorate(frame)
	if not self:IsHooked(frame,"AddMessage") then
		self:RawHook(frame, "AddMessage", true)
	end
end

function mod:OnEnable()
	channels = self.db.profile.channels
	self:RegisterEvent("CHAT_MSG_CHANNEL_NOTICE")
	for i = 1, NUM_CHAT_WINDOWS do
		local cf = _G["ChatFrame" .. i]
		if cf ~= COMBATLOG then
			self:RawHook(cf, "AddMessage", true)
		end
	end
	for index,name in ipairs(self.TempChatFrames) do
		local cf = _G[name]
		if cf then
			self:RawHook(cf, "AddMessage", true)
		end
	end
end

function mod:CHAT_MSG_CHANNEL_NOTICE()
	self:AddCustomChannels(GetChannelList())
end

local function replaceChannel(origChannel, msg, num, channel)
	local f = functions[channel] or functions[channel:lower()]
	local newChannelName = f and f(channel) or channels[channel] or channels[channel:lower()] or msg
	if newChannelName == empty_tag then return "" end
	return ("|Hchannel:%s|h%s|h%s"):format(origChannel, newChannelName, mod.db.profile.addSpace and " " or "")
end

local function replaceChannelRW(msg, channel)
	local f = functions[channel] or functions[channel:lower()]
	local newChannelName = f and f(channel) or channels[channel] or channels[channel:lower()] or msg
	return newChannelName .. (mod.db.profile.addSpace and " " or "")
end

function mod:AddMessage(frame, text, ...)
	if not text then 
		return self.hooks[frame].AddMessage(frame, text, ...)
	end
	-- removed the start of check, since blizz timestamps inject themselves in front of the line
	if (CHAT_TIMESTAMP_FORMAT) then
		text = gsub(text, "|Hchannel:(%S-)|h(%[([%d. ]*)([^%]]+)%])|h ", replaceChannel)
		text = gsub(text, "(%[(" .. L["Raid Warning"] .. ")%]) ", replaceChannelRW)
	else
		text = gsub(text, "^|Hchannel:(%S-)|h(%[([%d. ]*)([^%]]+)%])|h ", replaceChannel)
		text = gsub(text, "^(%[(" .. L["Raid Warning"] .. ")%]) ", replaceChannelRW)
	end
	text = gsub(text, L["To (|Hplayer.-|h):"], mod.db.profile.channels["Whisper To"] .. (mod.db.profile.addSpace and " %1:" or "%1:"))
	text = gsub(text, L["(|Hplayer.-|h) whispers:"], mod.db.profile.channels["Whisper From"] .. (mod.db.profile.addSpace and " %1:" or "%1:"))
	text = gsub(text, L["To (|HBNplayer.-|h):"], mod.db.profile.channels["BN Whisper To"] .. (mod.db.profile.addSpace and " %1:" or "%1:"))
	text = gsub(text, L["To <Away>(|HBNplayer.-|h):"], mod.db.profile.channels["away BN Whisper To"] .. (mod.db.profile.addSpace and " %1:" or "%1:"))
	text = gsub(text, L["To <Busy>(|HBNplayer.-|h):"], mod.db.profile.channels["busy BN Whisper To"] .. (mod.db.profile.addSpace and " %1:" or "%1:"))
	text = gsub(text, L["(|HBNplayer.-|h) whispers:"], mod.db.profile.channels["BN Whisper From"] .. (mod.db.profile.addSpace and " %1:" or "%1:"))
	return self.hooks[frame].AddMessage(frame, text, ...)
end

function mod:GetOptions()
	return options
end

function mod:Info()
	return L["Enables you to replace channel names with your own names. You can use '%s' to force an empty string."]:format( empty_tag )
end

mod.funcs = functions