+{-# LANGUAGE OverloadedStrings #-}
module Main where
-main = putStrLn "hello"
+import Prelude hiding (length, readFile, writeFile)
+import Data.ByteString.Char8 (ByteString, readFile, writeFile, length, unpack)
+import System.Environment (getArgs)
+import System.Exit (exitSuccess)
+import System.Directory (doesFileExist)
+import Text.ParserCombinators.Parsec (ParseError)
+
+import FuncTorrent.Bencode (decode, BVal(..))
+import FuncTorrent.Logger (initLogger, logMessage, logStop)
+import FuncTorrent.Metainfo (Info(..), Metainfo(..), mkMetaInfo)
+import FuncTorrent.Peer (handShakeMsg)
+import FuncTorrent.Tracker (connect, prepareRequest, peers, mkTrackerResponse)
+
+logError :: ParseError -> (String -> IO ()) -> IO ()
+logError e logMsg = logMsg $ "parse error: \n" ++ show e
+
+peerId :: String
+peerId = "-HS0001-*-*-20150215"
+
+exit :: IO ByteString
+exit = exitSuccess
+
+usage :: IO ()
+usage = putStrLn "usage: functorrent torrent-file"
+
+parse :: [String] -> IO ByteString
+parse [] = usage >> exit
+parse [a] = do
+ fileExist <- doesFileExist a
+ if fileExist
+ then readFile a
+ else error "file does not exist"
+parse _ = exit
+
+main :: IO ()
+main = do
+ args <- getArgs
+ logR <- initLogger
+ let logMsg = logMessage logR
+ logMsg $ "Parsing input file: " ++ concat args
+ torrentStr <- parse args
+ case decode torrentStr of
+ Right d ->
+ case mkMetaInfo d of
+ Nothing -> logMsg "parse error"
+ Just m -> do
+ logMsg "Input File OK"
+
+ let len = lengthInBytes $ info m
+ (Bdict d') = d
+ trackers = announceList m
+
+ logMsg "Trying to fetch peers: "
+ response <- connect (head trackers) (prepareRequest d' peerId len)
+
+ let hsMsgLen = show $ length $ handShakeMsg d' peerId
+ logMsg $ "Hand-shake message length : " ++ hsMsgLen
+
+ -- TODO: Write to ~/.functorrent/caches
+ writeFile (name (info m) ++ ".cache") response
+
+ case decode response of
+ Right trackerInfo ->
+ case mkTrackerResponse trackerInfo of
+ Right peerResp ->
+ logMsg $ "Peers List : " ++ (show . peers $ peerResp)
+ Left e -> logMsg $ "Error" ++ unpack e
+ Left e -> logError e logMsg
+
+ Left e -> logError e logMsg
+ logStop logR