package controllers

import play.api.mvc._

/*

 * Application sets a cookie in plain ASCII on the

 * client's browser recording the number of visits

 * of a page.

 */

object Application extends Controller {

  //no or invalid cookie results in the counter being 0

  def gt_cookie(c: Cookie) : Int = c.value match {

    case 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 =>

    //reads the cookie and extracts the visits counter   

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

    val visits = visits_cookie.map(gt_cookie).getOrElse(0)

    //printing a message according to value of visits counter

    val msg = 

      if (visits >= 10)

        s"You are a valued customer who has visited this site $visits times."               

      else s"You have visited this site $visits times."

    //send message with new cookie

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

  }

}