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))
  }
}