import scala.util.Random

object Magic8Ball extends App {
  val shake: () => String = {
    val answers = List(
      "It is certain.", "It is decidedly so.", "Without a doubt.",
      "Yes  definitely.", "You may rely on it.", "As I see it, yes.",
      "Most likely.", "Outlook good.", "Yes.", "Signs point to yes.",
      "Reply hazy, try again.", "Ask again later", "Better not tell you now.",
      "Cannot predict now.", "Concentrate and ask again.", "Don't count on it.",
      "My reply is no.", "My sources say no.", "Outlook not so good.",
      "Very doubtful."
    )
    val r = new Random
    () => answers(r.nextInt(answers.length))
  }

  println("Ask the Magic 8-Ball your questions. ('q' or 'quit' to quit)\n")

  while (true) {
    io.StdIn.readLine("Question: ").toLowerCase match {
      case "q" | "quit" =>
        println("Goodbye.")
        sys.exit()
      case _ =>
        println(s"Response: ${shake()}\n")
    }
  }
}