module Kevin.Protocol (kevinServer) where

import Control.Exception.Lens
import Control.Monad.State
import Data.Default
import Data.Monoid (mempty)
import Kevin.Base
import qualified Kevin.Damn.Protocol as S
import qualified Kevin.IRC.Protocol as C
import Kevin.Util.Logger
import Prelude

watchInterrupt :: [Handler IO (Maybe Kevin)]
watchInterrupt = [ handler _AsyncException throw
                 , handler_ id (return Nothing) ]

mkKevin :: Socket -> IO (Maybe Kevin)
mkKevin sock = flip catches watchInterrupt . withSocketsDo $ do
    (client, _, _) <- accept sock
    hSetBuffering client NoBuffering
    klogNow Blue "received a client"
    s <- execStateT (C.getAuthInfo client False) def
    damnSock <- connectTo "chat.deviantart.com" $ PortNumber 3900
    hSetBuffering damnSock NoBuffering
    logChan <- newChan
    damnChan <- newChan
    ircChan <- newChan
    return . Just $ Kevin damnSock
                          client
                          damnChan
                          ircChan
                          s
                          mempty
                          mempty
                          mempty
                          mempty
                          False
                          logChan

mkListener :: Int -> IO Socket
mkListener = listenOn . PortNumber . fromIntegral

kevinServer :: Int -> IO ()
kevinServer n = do
    sock <- mkListener n
    putStrLn $ "Listening on port " ++ show n
    forever $ do
        kev <- mkKevin sock
        case kev of
            Just k -> listen k
            Nothing -> return ()

listen :: Kevin -> IO ()
listen k = do
    mvar <- newTVarIO k
    runLogger (logger k)
    runPrinter (dChan k) (damn k)
    runPrinter (iChan k) (irc k)
    forkIO . void $ runReaderT (bracket_ S.initialize
                                         (S.cleanup >> io (closeClient k))
                                         S.listen) mvar
    forkIO . void $ runReaderT (bracket_ (return ())
                                         (C.cleanup >> io (closeServer k))
                                         C.listen) mvar
    return ()