{-


Copyright © 2010-2012 Jon Kristensen, Philipp Balzarek

This file (EchoClient.hs) illustrates how to connect, authenticate, set a simple
presence, receive message stanzas, and echo them back to whoever is sending
them, using Pontarius. The contents of this file may be used freely, as if it is
in the public domain.

-}


{-# LANGUAGE OverloadedStrings #-}

module Main where

import           Control.Concurrent
import           Control.Monad
import           Data.Maybe (fromJust)
import qualified Data.Text as Text
import           Text.Printf

import           Network.TLS
import           Network.Xmpp
import           Network.Xmpp.IM
import           System.IO (stderr)
import           System.Log.Formatter
import           System.Log.Handler hiding (setLevel)
import           System.Log.Handler.Simple
import           System.Log.Logger

-- Server and authentication details.
realm    = "species64739.dyndns.org"
username = "echo"
password = "pwd"
resource = Just "bot"

-- | Automatically accept all subscription requests from other entities
autoAccept :: Session -> IO ()
autoAccept session = forever $ do
  st <- waitForPresence isPresenceSubscribe session
  friend <- case presenceFrom st of
      Just from -> do
          sendPresence (presenceSubscribed from) session
          return $ show from
      Nothing -> return "anonymous" -- this shouldn't happen
  printf "Hello %s !" friend

main :: IO ()
main = do
    updateGlobalLogger "Pontarius.Xmpp" $ setLevel DEBUG
    handler <- streamHandler stderr DEBUG >>= \h ->
        return $ setFormatter h (simpleLogFormatter "$time - $loggername: $prio: $msg")
    updateGlobalLogger "Pontarius.Xmpp" (addHandler handler)

    sess' <- session
                realm
                Nothing -- (Just defaultParamsClient)
                (Just ([scramSha1 username Nothing password], resource))
    sess <- case sess' of
        Left err -> error $ "Error connection to XMPP server: " ++ show err
        Right (_, Just err) -> error $ "Error while authenticating: " ++ show err
        Right (sess, Nothing) -> return sess
    -- We won't be able to receive stanzas before we set out status to online
    sendPresence presenceOnline sess
    putStrLn "Connected."
    -- We want to see all incoming stanzas in the auto-accept thread as well.
    sess' <- dupSession sess
    _thread <- forkIO $ autoAccept sess'
    forever $ do
        -- Echo all messages back to the user.
        msg <- getMessage sess
        sendMessage (answerIM (bodies msg) [] msg) sess
        -- Print the received message to the screen.
        let sender = show . fromJust $ messageFrom msg
        let contents = maybe "nothing" Text.unpack $ body msg
        printf "%s says \"%s\"\n" sender contents
    return ()