{-

 Copyright (c) 2005 Jesper Louis Andersen <jlouis@mongers.org>

 Permission to use, copy, modify, and distribute this software for any
 purpose with or without fee is hereby granted, provided that the above
 copyright notice and this permission notice appear in all copies.

 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

-}
-----------------------------------------------------------------------------
-- C O N J U R E
-- 
-- How small a Bittorrent implementation can you actually do?
--
-- The current Bittorrent implementation is about 10.000 lines. Let us
-- Beat that by lengths.
-----------------------------------------------------------------------------
import qualified Config
import qualified Conjure.OptionParser
import qualified Conjure.InterestStatThread as IST
import qualified Conjure.PeerThread as PT
import qualified Conjure.Torrent as Torrent
import qualified Conjure.Version as Version
import qualified FS.Storage ()
import qualified Data.List.Shuffle ()
import qualified Control.Concurrent.HoldTimer ()
import Control.Concurrent.STM.TChan.Atomic
import qualified Conjure.WireProtocol ()
import qualified TrackerClient as TC
import qualified Conjure.NaivePiecePicker as NPP
import qualified FS.FSThread as FST 
import Conjure.Logger

import Control.Concurrent
import Control.Concurrent.STM
import Control.Monad (liftM)
import System
import System.IO (hPutStr)
import System.Random (randomRIO)
import Network (PortID(..), listenOn, accept)
import List (isPrefixOf)

main :: IO ()
main = 
  do (flags, torrentname) <- getArgs >>= Conjure.OptionParser.getOpts
     -- this is mostly just faking, what is faked here should be done 
     -- right in other modules and imported.

     initLogger flags

     putStrLn $ Version.showVersionHeader Version.conjure_version
     putStrLn $ "Conjure is currently non-functional, read DEVELOPING\n"
	        ++ "  if you want to help out"
     torrent <- liftM (either (error . show) id)
		  $ Torrent.readTorrentFile torrentname
     debugM "Conjure" $ "Flags are: " ++ show flags
     debugM "Conjure" $ "Torrent is:\n" ++ Torrent.ppShow torrent
     
     debugM "Conjure" "Firing up InterestThread"
     size <- return $ Torrent.infoNumPieces torrent
     cp <- Config.readCfg
     let cutoff = Config.getRarestFirstCutoffPoint cp
     --(_, ist_chan) <- IST.runThread size cutoff
     IST.runThread size cutoff

     infoM "Conjure" "Firing up FSThread" 
     (_, _, piecesMVar) <- FST.runThread torrent
     pieces <- readMVar piecesMVar
     infoM "Conjure" ("FSThread found these pieces: " ++ show pieces)

     infoM "Conjure" $ "Firing up NaivePickerThread - alternative to IST"
     (_, picker_chan) <- NPP.runThread torrent

     debugM "Conjure" "Files to get:"
     mapM_ ((debugM "Conjure").show) (Torrent.fileInfo torrent)

     node_id <- liftM ("conjure-----" ++) $
                sequence (replicate 8 $ randomRIO ('a', 'z'))
     node_id' <- liftM ("conjure-----" ++) $
                 sequence (replicate 8 $ randomRIO ('a', 'z'))
     
     debugM "Conjure" "Starting dummy listener"
     let port = 6881
     sock <- listenOn (PortNumber port)
     forkIO (do (h, _, _) <- accept sock
                hPutStr h ("\19BitTorrent protocol"
                           ++ replicate 8 '\0'
                           ++ Torrent.infoHash torrent
                           ++ node_id))

     response <-  TC.queryTracker
                   torrent node_id
                   Nothing
                   port
                   0 0 (sum $ map (fromIntegral . snd) $
                            Torrent.fileInfo torrent)
                   (Just "started")

     debugM "Conjure" $ "Tracker response: " ++ show response

     debugM "Conjure" $ "Press Ctrl-C to interrupt"

     debugM "Conjure" $ "Starting PeerThread"
     let peer = head $ filter (not.("conjure" `isPrefixOf`).TC.peerId) $ TC.trackerPeers response
     report_chan <- atomically newTChan
     PT.runThread peer torrent node_id (sendMessage report_chan) (sendMessage picker_chan)
     PT.runThread peer torrent node_id' (sendMessage report_chan) (sendMessage picker_chan)

     loop report_chan
  where
  loop ch = do r <- recvMessage ch
               debugM "Conjure" $ "Main: received report " ++ show r
               loop ch