module Role.Downloader where

import Types
import Log
import CmdLine
import SessionID

import Control.Concurrent.STM
import Role.Developer (run', processSessionStart, getUserMessage, Output(..))

run :: DownloadOpts -> IO ()
run = run' downloader . downloadUrl

downloader :: TChan (Message Entered) -> TChan (Message Seen) -> SessionID -> IO ()
downloader _ichan ochan sid = do
	let logfile = sessionLogFile "." sid
	putStrLn $ "Starting download to " ++ logfile
	putStrLn "(Will keep downloading until the debug-me session is done.)"
	withLogger logfile $ \logger -> do
		st <- processSessionStart ochan logger
		go logger st
  where
	go logger st = do
		(o, msg) <- atomically $ getUserMessage ochan st
		_ <- logger $ User msg
		case o of
			ProtocolError e -> error ("Protocol error: " ++ e)
			_ -> return ()
		go logger st