object Birthday extends App {

  val recipe = List("Flour", "Sugar", "Baking Powder", "Eggs", "Vanilla")
  val dryStuff = recipe.slice(0, 3)
  val wetStuff = recipe.slice(3, 5)

  class Cake() {

    var mixingBowl = ""

    def mix(stuffToMix: List[String]) = {
      val mixTwo = (one: String, two: String) => (one + " and " + two)
      if (!mixingBowl.isEmpty()) mixingBowl += " and "
      mixingBowl += "(" + stuffToMix.reduceLeft(mixTwo) + ")"
      println("Mixing bowl contains: " + mixingBowl)
    }

    def bake() {
      var ingredientsPresent = true
      for (ing <- recipe) {
        if (!mixingBowl.contains(ing)) {
          ingredientsPresent = false
        }
      }
      if (ingredientsPresent) {
        println("Ingredients correct!")
        Thread.sleep(500)
        print("Baking")
        for (i <- (0 to 4)) {
        Thread.sleep(900)
        print(".")
        }
        println("Cake complete! Happy Birthday!")

      } else {
        println("Required ingredients not detected")
      }
    }
  }

  val bDayCake = new Cake
  println("Recipe: ")
  recipe.foreach(str => println("\t" + str))
  Thread.sleep(1000)
  bDayCake.mix(dryStuff)
  Thread.sleep(1000)
  bDayCake.mix(wetStuff)
  Thread.sleep(1000)
  bDayCake.bake()
}