{-# LANGUAGE PackageImports, OverloadedStrings, NoMonomorphismRestriction #-}
module Example where

import           Control.Concurrent
import           Control.Concurrent.STM
import qualified Control.Exception.Lifted as Ex
import           Control.Monad
import           Control.Monad.State
import           Control.Monad.IO.Class
import           Control.Monad.Reader

import           Data.Maybe
import           Data.Text (Text)
import qualified Data.Text as Text
import           Data.XML.Pickle
import           Data.XML.Types

import           Network
import           Network.Xmpp
import           Network.Xmpp.Concurrent.Channels
import           Network.Xmpp.IM.Presence
import           Network.Xmpp.Pickle
import           Network.Xmpp.Types
import qualified Network.Xmpp.Xep.InbandRegistration as IBR
import qualified Network.Xmpp.Xep.ServiceDiscovery as Disco

import           System.Environment
import           Text.XML.Stream.Elements

testUser1 :: Jid
testUser1 = read "testuser1@species64739.dyndns.org/bot1"

testUser2 :: Jid
testUser2 = read "testuser2@species64739.dyndns.org/bot2"

supervisor :: Jid
supervisor = read "uart14@species64739.dyndns.org"

testNS :: Text
testNS = "xmpp:library:test"

type Xmpp a = CSession -> IO a

data Payload = Payload
               { payloadCounter :: Int
               , payloadFlag    :: Bool
               , payloadText    :: Text
               } deriving (Eq, Show)

payloadP = xpWrap (\((counter,flag) , message) -> Payload counter flag message)
                  (\(Payload counter flag message) ->((counter,flag) , message)) $
                   xpElem (Name "request" (Just testNS) Nothing)
                      (xpPair
                        (xpAttr "counter" xpPrim)
                        (xpAttr "flag" xpPrim)
                      )
                      (xpElemNodes (Name "message" (Just testNS) Nothing)
                          (xpContent xpId))

invertPayload (Payload count flag message) = Payload (count + 1) (not flag) (Text.reverse message)

iqResponder csession = do
  chan' <- listenIQChan Get testNS csession
  chan <- case chan' of
      Left _ -> liftIO $ putStrLn "Channel was already taken"
                     >> error "hanging up"
      Right c -> return c
  forever $ do
    next <- liftIO . atomically $ readTChan chan
    let Right payload = unpickleElem payloadP . iqRequestPayload $
                          iqRequestBody next
    let answerPayload = invertPayload payload
    let answerBody = pickleElem payloadP answerPayload
    unless (payloadCounter payload == 3) . void $
        answerIQ next (Right $ Just answerBody) csession
    when (payloadCounter payload == 10) $ do
        threadDelay 1000000
        endSession (session csession)

autoAccept :: Xmpp ()
autoAccept csession = forever $ do
  st <- waitForPresence isPresenceSubscribe csession
  sendPresence (presenceSubscribed (fromJust $ presenceFrom st)) csession

simpleMessage :: Jid -> Text -> Message
simpleMessage to txt = message
    { messageTo = Just to
    , messagePayload = [ Element
                             "body"
                              []
                              [NodeContent $ ContentText txt]
                       ]
    }
  where
    message = Message { messageID      = Nothing
                      , messageFrom    = Nothing
                      , messageTo      = Nothing
                      , messageLangTag = Nothing
                      , messageType    = Normal
                      , messagePayload = []
                      }

sendUser m csession = sendMessage (simpleMessage supervisor $ Text.pack m) csession

expect debug x y csession | x == y = debug "Ok."
                          | otherwise = do
                              let failMSG = "failed" ++ show x ++ " /= " ++ show y
                              debug failMSG
                              sendUser failMSG csession

wait3 :: MonadIO m => m ()
wait3 = liftIO $ threadDelay 1000000

discoTest debug csession = do
    q <- Disco.queryInfo "species64739.dyndns.org" Nothing csession
    case q of
        Left (Disco.DiscoXMLError el e) -> do
            debug (ppElement el)
            debug (Text.unpack $ ppUnpickleError e)
            debug (show $ length $ elementNodes el)
        x -> debug $ show x

    q <-  Disco.queryItems "species64739.dyndns.org"
                     (Just "http://jabber.org/protocol/commands") csession
    case q of
        Left (Disco.DiscoXMLError el e) -> do
            debug (ppElement el)
            debug (Text.unpack $ ppUnpickleError e)
            debug (show $ length $ elementNodes el)
        x -> debug $ show x

iqTest debug we them csession = do
    forM [1..10] $ \count -> do
        let message = Text.pack . show $ localpart we
        let payload = Payload count (even count) (Text.pack $ show count)
        let body = pickleElem payloadP payload
        debug "sending"
        answer <- sendIQ' (Just them) Get Nothing body csession
        case answer of
            IQResponseResult r -> do
                debug "received"
                let Right answerPayload = unpickleElem payloadP
                                      (fromJust $ iqResultPayload r)
                expect debug (invertPayload payload) answerPayload csession
            IQResponseTimeout -> do
                debug $ "Timeout in packet: " ++ show count
            IQResponseError e -> do
                debug $ "Error in packet: " ++ show count
        liftIO $ threadDelay 100000
    sendUser "All tests done" csession
    debug "ending session"

fork action csession = do
    csession' <- forkCSession csession
    forkIO $ action csession'

ibrTest debug uname pw = IBR.registerWith [ (IBR.Username, "testuser2")
                                 , (IBR.Password, "pwd")
                                 ] >>= debug . show


runMain :: (String -> STM ()) -> Int -> Bool -> IO ()
runMain debug number multi = do
  let (we, them, active) = case number `mod` 2 of
                             1 -> (testUser1, testUser2,True)
                             0 -> (testUser2, testUser1,False)
  let debug' = liftIO . atomically .
               debug . (("Thread " ++ show number ++ ":") ++)
  csession <- newSessionChans

  setConnectionClosedHandler (\e s -> do
              debug' $ "connection lost because " ++ show e
              endSession s) (session csession)
  debug' "running"
  flip withConnection (session csession) $ Ex.catch (do
      connect "localhost" (PortNumber 5222) "species64739.dyndns.org"
      startTLS exampleParams
      -- debug' "ibr start"
      -- ibrTest debug' (localpart we) "pwd"
      -- debug' "ibr end"
      saslResponse <- simpleAuth
                        (fromJust $ localpart we) "pwd" (resourcepart we)
      case saslResponse of
          Right _ -> return ()
          Left e -> error $ show e
      debug' "session standing"
      features <- other `liftM` gets sFeatures
      liftIO . void $ forM features $ \f -> debug' $ ppElement f
      )
      (\e -> debug' $ show  (e ::Ex.SomeException))
  sendPresence presenceOnline csession
  thread1 <- fork autoAccept csession
  sendPresence (presenceSubscribe them) csession
  thread2 <- fork iqResponder csession
  when active $ do
    liftIO $ threadDelay 1000000 -- Wait for the other thread to go online
--    discoTest debug'
    when multi $ iqTest debug' we them csession
    closeConnection (session csession)
    killThread thread1
    killThread thread2
  return ()
  liftIO . threadDelay $ 10^6
--  unless multi . void .  withConnection $ IBR.unregister
  unless multi . void $ fork (\s -> forever $ do
                                                 pullMessage s >>= debug' . show
                                                 putStrLn ""
                                                 putStrLn ""
                             )
                             csession
  liftIO . forever $ threadDelay 1000000
  return ()

run i multi = do
  out <- newTChanIO
  debugger <- forkIO . forever $ atomically (readTChan out) >>= putStrLn
  let debugOut = writeTChan out
  when multi . void $ forkIO $ runMain debugOut (1 + i) multi
  runMain debugOut (2 + i) multi


main = run 0 True