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package scalaz
package effect

////
/**
 *
 */
////
trait LiftIO[F[_]]  { self =>
  ////

  def liftIO[A](ioa: IO[A]): F[A]

  // derived functions

  ////
  val liftIOSyntax = new scalaz.syntax.effect.LiftIOSyntax[F] { def F = LiftIO.this }
}

object LiftIO {
  @inline def apply[F[_]](implicit F: LiftIO[F]): LiftIO[F] = F

  ////
  implicit def idTLiftIO[F[_]: LiftIO] =
    new LiftIO[IdT[F, ?]] {
      def liftIO[A](ioa: IO[A]) = IdT(LiftIO[F].liftIO(ioa))
    }

  implicit def listTLiftIO[F[_]: LiftIO] =
    new LiftIO[ListT[F, ?]] {
      def liftIO[A](ioa: IO[A]) = ListT(LiftIO[F].liftIO(ioa.map(_ :: Nil)))
    }

  implicit def optionTLiftIO[F[_]: LiftIO] =
    new LiftIO[OptionT[F, ?]] {
      def liftIO[A](ioa: IO[A]) = OptionT(LiftIO[F].liftIO(ioa.map(Some(_): Option[A])))
    }

  implicit def eitherTLiftIO[F[_]: LiftIO, E] =
    new LiftIO[EitherT[F, E, ?]] {
      def liftIO[A](ioa: IO[A]) = EitherT(LiftIO[F].liftIO(ioa.map(\/.right)))
    }

  implicit def streamTLiftIO[F[_]: LiftIO: Applicative] = 
    new LiftIO[StreamT[F, ?]] {
      def liftIO[A](ioa: IO[A]) = StreamT(LiftIO[F].liftIO(ioa.map(StreamT.Yield(_, StreamT.empty))))
    }

  implicit def kleisliLiftIO[F[_]: LiftIO, E] =
    new LiftIO[Kleisli[F, E, ?]] {
      def liftIO[A](ioa: IO[A]) = Kleisli(_ => LiftIO[F].liftIO(ioa))
    }

  implicit def writerTLiftIO[F[_]: LiftIO, W: Monoid] =
    new LiftIO[WriterT[F, W, ?]] {
      def liftIO[A](ioa: IO[A]) = WriterT(LiftIO[F].liftIO(ioa.map((Monoid[W].zero, _))))
    }

  implicit def stateTLiftIO[F[_]: LiftIO, S](implicit F: Monad[F]) =
    new LiftIO[StateT[F, S, ?]] {
      def liftIO[A](ioa: IO[A]) = StateT(s => LiftIO[F].liftIO(ioa.map((s, _))))
    }

  ////
}