import akka.actor._



case class SetPartner(partner: ActorRef)
case class Ball(counter: Int)

class Player extends Actor {

  var partner = context.self

  def receive = {

    case SetPartner(p: ActorRef, m: Int) =>
      partner = p


    case Ball(counter) =>

      if(counter<=0)
        system.shutdown
      else if (counter%2==0) {
        println("Pong")
        partner ! Ball(counter-1)
      } else {
        println ("Ping")
        partner ! Ball(counter-1)
      }
  }
}

object Main {
  def main(args: Array[String]) {
    val system = ActorSystem("PingPong")
    val player1 = system.actorOf(Props[Player])
    val player2 = system.actorOf(Props[Player])

    player1 ! Set(player2)
    player2 ! Set(player1)

    player1 ! Ball(0)
  }

}