rps-min.scala

import scala.io.StdIn
import scala.util.Random
import scala.util.Try

/**
 * @author pmucha
 */
object rps extends App {
  def k[A](x: A)(f: A => Unit): A = { f(x); x } // kestrel combinator
  object Weapon extends Enumeration{
    type WeaponType = Value
    val ROCK, PAPER, SCISSOR, LIZARD, SPOCK = Value
  }
  
  def chooseRandomWeapon(name:String) = {
    k(Weapon(Random.nextInt(Weapon.maxId)))(w => println(s"$name chose $w"))
  }
  
  def chooseWeapon(name:String): Weapon.WeaponType = {
    println("choose weapon: " +  Weapon.values.map(w => s"(${w.id}) $w").mkString(", "))
    return Try(k(Weapon(StdIn.readInt()))(w => println(s"$name chose $w"))).getOrElse(chooseWeapon(name))
  }
  
  def play(w1:Weapon.WeaponType, w2:Weapon.WeaponType) = {
    val result = (Weapon.maxId + w1.id - w2.id) % Weapon.maxId
    val resultStr = List("Tie","P2 Won","P1 Won")(if (result == 0) 0 else (result%2 +1))
    println(resultStr)
  }
  
  if (args contains "human")
    play(chooseWeapon("Player"), chooseRandomWeapon("Computer"))
  else
    play(chooseRandomWeapon("Computer1"), chooseRandomWeapon("Computer2"))
  
}