object GeometricShapes extends App {

  val inputHeight = scala.io.StdIn.readLine("Please insert the height of your shape:")
  val validHeight = validInput(inputHeight)
  println(s" höhe: $validHeight")

  val inputWidth = scala.io.StdIn.readLine("Please insert the width of your shape:")
  val validWidth = validInput(inputWidth)
  println(s" höhe: $validWidth")

  val shape = scala.io.StdIn.readLine("Enter the type of your shape (rectangle,triangle or circle):")
  val shape1 = shape.trim()
  shapes(validHeight , validWidth, shape1)



  def validInput(input: String): Double = {
    val pattern = """\s*(\d+[.,]?\d*)\s*(mm|cm|dm|m)\s*""".r

    input match {
      case pattern(value, unit) => {
        val replacedValue = value.replace(",", ".")
        if (unit == "mm") return replacedValue.toDouble / 10.0
        else if (unit == "dm") return replacedValue.toDouble * 10
        else if (unit == "m")  return replacedValue.toDouble * 100.0
        else return replacedValue.toDouble

      }
      case _ => {
        println("This is not a valid dimension! Use a number followed by either \"m\",\"dm\",\"cm\" or \"mm\".")
        System.exit(0)
        return 0.0}
    }
  }

  def shapes(height: Double, width: Double, shape: String): Any = {

    shape match {
      case  "rectangle" => println("The area of your rectangle with height= %.2fcm and width=%.2fcm is: %.2f cm2".format(height, width, width*height))
      case "triangle" => println("The area of your triangle with height= %.2fcm and width=%.2fcm is: %.2f cm2".format(height, width, ((width*height)/2).toDouble))
      case "circle" => {
        if(height == width) println("The area of your circle with height= %.2fcm and width=%.2fcm is: %.2f cm2".format(height, width, height*height*math.Pi))
        else {
          println("Height and width of a circle need to be equal!")
          System.exit(0)
        }
      }
      case wrong => println("Shape \"%s\" is not supported. Please use \"rectangle\",\"triangle\" or \"circle\"".format(shape))
    }



  }

}