module Main where

import Network

import IO

import System.IO

import Control.Concurrent

import Control.Concurrent.STM

import Control.Exception (finally)

import Miscutils

handleCmd :: Handle -> TVar[ClientInfo] -> TVar[RoomInfo] -> (String, [String]) -> IO()

handleCmd clientHandle clientsList roomsList ("SAY", param) = do

		ls <- atomically(readTVar clientsList)

		sendOthers (map (\x -> handle x) ls) clientHandle (concat param)

		return ()

handleCmd clientHandle clientsList roomsList ("CREATE", [roomname]) = do

		sendMsg clientHandle ("JOINED " ++ roomname)

handleCmd clientHandle clientsList roomsList ("LIST", []) = do

		rl <- atomically $ readTVar roomsList

		sendMsg clientHandle (unlines $ map (\x -> name x) rl)

handleCmd clientHandle _ _ ("PING", _) = sendMsg clientHandle "PONG"

handleCmd clientHandle _ _ (_, _) = sendMsg clientHandle "Unknown cmd or bad syntax"

clientLoop :: Handle -> TVar[ClientInfo] -> TVar[RoomInfo] -> IO()

clientLoop clientHandle clientsList roomsList = do

		cline <- hGetLine clientHandle

		let (cmd, params) = extractCmd cline

		handleCmd clientHandle clientsList roomsList (cmd, params)

		if cmd /= "QUIT" then clientLoop clientHandle clientsList roomsList else return ()

main = do

	clientsList <- atomically $ newTVar[]

	roomsList <- atomically $ newTVar[]

	bracket

		(sClose)

		(loop clientsList roomsList)

		where

			loop clist rlist sock = accept sock >>= addClient clist rlist >> loop clist rlist sock

			addClient clist rlist (chandle, hostname, port) = do

				putStrLn $ "Client connected: " ++ show hostname

				hSetBuffering chandle LineBuffering

				manipState clist (\x -> (ClientInfo chandle "" "" False):x) -- add client to list

				forkIO $ finally

					(clientLoop chandle clist rlist)

					(do

					manipState clist (\x -> filter (\x -> chandle /= handle x) x) -- remove client from list

					hClose chandle)