object Application extends Controller {

  def gt_cookie(c: Option[Cookie]) : Int = c.map(_.value) match {

    case Some(s) if (s.forall(_.isDigit)) => s.toInt 

    case _ => 0

  }

  def mk_cookie(i: Int) : Cookie = {

    Cookie("visits", i.toString)

  }

  // GET request: read cookie data first

  def index = Action { request =>

    val visits_cookie = request.cookies.get("visits")

    val visits = gt_cookie(visits_cookie)

    val msg1 = "You are a valued customer who has visited this site %d times."               

    val msg2 = "You have visited this site %d times."

    val msg = 

      if (visits >= 10) msg1.format(visits) else msg2.format(visits)

    //send with new cookie

    Ok(msg).as(HTML).withCookies(mk_cookie(visits + 1))

  }

}