{-# language CPP #-}
{-# language DataKinds #-}

module Socket.Interruptible
  ( InterruptRep
  , Interrupt
  , Intr
  , wait
  , tokenToStreamSendException
  , tokenToStreamReceiveException
  , tokenToDatagramSendException
  , tokenToDatagramReceiveException
  , tokenToSequencedPacketSendException
  , tokenToSequencedPacketReceiveException
  ) where

import Socket (Interruptibility(Interruptible))
import Socket.EventManager (Token)
import Control.Concurrent.STM (TVar)
import qualified Socket.EventManager as EM
import qualified Socket.Stream as Stream
import qualified Socket.Datagram as Datagram
import qualified Socket.SequencedPacket as SequencedPacket

#if MIN_VERSION_base(4,16,0)
import GHC.Exts (RuntimeRep(BoxedRep),Levity(Lifted))
#else
import GHC.Exts (RuntimeRep(LiftedRep))
#endif

type InterruptRep = 
#if MIN_VERSION_base(4,16,0)
  'BoxedRep 'Lifted
#else
  'LiftedRep
#endif

type Interrupt = TVar Bool
type Intr = 'Interruptible

tokenToSequencedPacketSendException :: Token -> Either (SequencedPacket.SendException 'Interruptible) ()
{-# inline tokenToSequencedPacketSendException #-}
tokenToSequencedPacketSendException t = if EM.isInterrupt t
  then Left SequencedPacket.SendInterrupted
  else Right ()

tokenToSequencedPacketReceiveException :: Token -> Either (SequencedPacket.ReceiveException 'Interruptible) ()
{-# inline tokenToSequencedPacketReceiveException #-}
tokenToSequencedPacketReceiveException t = if EM.isInterrupt t
  then Left SequencedPacket.ReceiveInterrupted
  else Right ()

tokenToStreamSendException :: Token -> Int -> Either (Stream.SendException 'Interruptible) ()
{-# inline tokenToStreamSendException #-}
tokenToStreamSendException t i = if EM.isInterrupt t
  then Left (Stream.SendInterrupted i)
  else Right ()

tokenToStreamReceiveException :: Token -> Int -> Either (Stream.ReceiveException 'Interruptible) ()
{-# inline tokenToStreamReceiveException #-}
tokenToStreamReceiveException t i = if EM.isInterrupt t
  then Left (Stream.ReceiveInterrupted i)
  else Right ()

tokenToDatagramSendException :: Token -> Either (Datagram.SendException 'Interruptible) ()
{-# inline tokenToDatagramSendException #-}
tokenToDatagramSendException t = if EM.isInterrupt t
  then Left Datagram.SendInterrupted
  else Right ()

tokenToDatagramReceiveException :: Token -> Either (Datagram.ReceiveException 'Interruptible) ()
{-# inline tokenToDatagramReceiveException #-}
tokenToDatagramReceiveException t = if EM.isInterrupt t
  then Left Datagram.ReceiveInterrupted
  else Right ()

wait :: TVar Bool -> TVar Token -> IO Token
{-# inline wait #-}
wait = EM.interruptibleWait