package controllers

import play.api._

import play.api.mvc._

import play.api.data._

import play.api.data.Forms._

/*

 * Application sets a cookie in plain ASCII on the

 * clients browser recording the visits of a page.

 */

object Application extends Controller {

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

  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 =>

    //reads the cookie and extracts the visits counter   

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

    val visits = gt_cookie(visits_cookie)

    //printing a message according to value of visits counter

    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 message with new cookie

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

  }

}