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package scalaz

trait Each[-E[_]] {
  def each[A](e: E[A], f: A => Unit): Unit
}

object Each {
  import Scalaz._

  implicit def IdentityEach: Each[Identity] = new Each[Identity] {
    def each[A](e: Identity[A], f: A => Unit) = f(e.value)
  }

  implicit def NonEmptyListEach[A]: Each[NonEmptyList] = new Each[NonEmptyList] {
    def each[A](e: NonEmptyList[A], f: A => Unit) = e.list foreach f
  }

  implicit def StateEach: Each[({type λ[α]=State[Unit, α]})#λ] = new Each[({type λ[α]=State[Unit, α]})#λ] {
    def each[A](e: State[Unit, A], f: A => Unit) = f(e(())._2)
  }

  implicit def ZipStreamEach = new Each[ZipStream] {
    def each[A](e: ZipStream[A], f: A => Unit) = e.value foreach f
  }

  implicit def IndSeqEach[A]: Each[IndSeq] = new Each[IndSeq] {
    def each[A](e: IndSeq[A], f: A => Unit) = e.toList foreach f
  }

  implicit def Tuple1Each: Each[Tuple1] = new Each[Tuple1] {
    def each[A](e: Tuple1[A], f: A => Unit) = f(e._1)
  }

  implicit def Tuple2Each[R]: Each[({type λ[α]=(R, α)})#λ] = new Each[({type λ[α]=(R, α)})#λ] {
    def each[A](e: (R, A), f: A => Unit) = f(e._2)
  }

  implicit def Tuple3Each[R, S]: Each[({type λ[α]=(R, S, α)})#λ] = new Each[({type λ[α]=(R, S, α)})#λ] {
    def each[A](e: (R, S, A), f: A => Unit) = f(e._3)
  }

  implicit def Tuple4Each[R, S, T]: Each[({type λ[α]=(R, S, T, α)})#λ] = new Each[({type λ[α]=(R, S, T, α)})#λ] {
    def each[A](e: (R, S, T, A), f: A => Unit) = f(e._4)
  }

  implicit def Tuple5Each[R, S, T, U]: Each[({type λ[α]=(R, S, T, U, α)})#λ] = new Each[({type λ[α]=(R, S, T, U, α)})#λ] {
    def each[A](e: (R, S, T, U, A), f: A => Unit) = f(e._5)
  }

  implicit def Tuple6Each[R, S, T, U, V]: Each[({type λ[α]=(R, S, T, U, V, α)})#λ] = new Each[({type λ[α]=(R, S, T, U, V, α)})#λ] {
    def each[A](e: (R, S, T, U, V, A), f: A => Unit) = f(e._6)
  }

  implicit def Tuple7Each[R, S, T, U, V, W]: Each[({type λ[α]=(R, S, T, U, V, W, α)})#λ] = new Each[({type λ[α]=(R, S, T, U, V, W, α)})#λ] {
    def each[A](e: (R, S, T, U, V, W, A), f: A => Unit) = f(e._7)
  }

  implicit def Function0Each: Each[Function0] = new Each[Function0] {
    def each[A](e: () => A, f: A => Unit) = f(e.apply)
  }

  implicit def TraversableOnceEach[A]: Each[TraversableOnce] = new Each[TraversableOnce] {
    def each[A](e: TraversableOnce[A], f: A => Unit) = e foreach  f
  }

  implicit def OptionEachEach: Each[Option] = new Each[Option] {
    def each[A](e: Option[A], f: A => Unit) = e foreach f
  }

  implicit def LazyOptionEachEach: Each[LazyOption] = new Each[LazyOption] {
    def each[A](e: LazyOption[A], f: A => Unit) = e foreach (a => f(a))
  }

  implicit def EitherLeftEach[X]: Each[({type λ[α]=Either.LeftProjection[α, X]})#λ] = new Each[({type λ[α]=Either.LeftProjection[α, X]})#λ] {
    def each[A](e: Either.LeftProjection[A, X], f: A => Unit) = e foreach f
  }

  implicit def EitherRightEach[X]: Each[({type λ[α]=Either.RightProjection[X, α]})#λ] = new Each[({type λ[α]=Either.RightProjection[X, α]})#λ] {
    def each[A](e: Either.RightProjection[X, A], f: A => Unit) = e foreach f
  }

  implicit def ValidationEach[X]: Each[({type λ[α]=Validation[X, α]})#λ] = new Each[({type λ[α]=Validation[X, α]})#λ] {
    def each[A](v: Validation[X, A], f: A => Unit) = v.foreach(f)
  }

  implicit def ResponderEach: Each[Responder] = new Each[Responder] {
    def each[A](e: Responder[A], f: A => Unit) = e respond f
  }

  import java.util.concurrent.Callable

  implicit def CallableEach: Each[Callable] = new Each[Callable] {
    def each[A](e: Callable[A], f: A => Unit) = f(e.call)
  }

  import java.util.Map.Entry

  implicit def MapEntryEach[X]: Each[({type λ[α]=Entry[X, α]})#λ] = new Each[({type λ[α]=Entry[X, α]})#λ] {
    def each[A](e: Entry[X, A], f: A => Unit) = f(e.getValue)
  }

  import concurrent.Promise
  implicit def PromiseEach: Each[Promise] = new Each[Promise] {
    def each[A](e: Promise[A], f: A => Unit) = f(e.get)
  }

  implicit def JavaIterableEach: Each[java.lang.Iterable] = new Each[java.lang.Iterable] {
    def each[A](e: java.lang.Iterable[A], f: A => Unit) = {
      val i = e.iterator

      while (i.hasNext) {
        f(i.next)
      }
    }
  }
}