var SessionHandler = (function () {
  var sessionHandler = function () {};

  var interval = 0;
  var countDownTimer;
  var timerSpanElement;
  var timerUrl;
  var warnTime = 60;
  var refreshTime = 60;
  var warningTrigered = false;

  var warnMethod = function () {};
  var endMethod = function () {};

  sessionHandler.SetTimeSpanElement = function (element) {
    timerSpanElement = element;
  };
  sessionHandler.Url = function (url) {
    timerUrl = url;
  };
  sessionHandler.WarningTime = function (second) {
    warnTime = second;
  };
  sessionHandler.WarnMethod = function (method) {
    warnMethod = method;
  };
  sessionHandler.EndMethod = function (method) {
    endMethod = method;
  };
  sessionHandler.Start = function () {
    getRemainingTime();
  };
  sessionHandler.Clear = function () {
    resetInterval();
  };

  function startSessionTimer(duration) {
    var countDownTimer = 0;
    var actualTime = duration;
    resetInterval();
    interval = setInterval(function () {
      var minutes = parseInt(actualTime / 60, 10);
      var seconds = parseInt(actualTime % 60, 10);

      minutes = minutes < 10 ? '0' + minutes : minutes;
      seconds = seconds < 10 ? '0' + seconds : seconds;
      setSpanText(minutes, seconds);
      countDownTimer = countDownTimer + 1;
      actualTime = duration - countDownTimer;

      if (actualTime < warnTime) {
        if (!warningTrigered) {
          getRemainingTime();
        }
      } else {
        warningTrigered = false;
      }

      if (countDownTimer > refreshTime || actualTime < 1) {
        getRemainingTime();
      }
    }, 1000);
  }

  function getRemainingTime() {
    resetInterval();
    if (typeof timerUrl !== 'undefined') {
      AjaxHelper.AsyncPingPost(timerUrl, remainingTimeCallback);
    }
  }

  function remainingTimeCallback(remainingSeconds) {
    if (remainingSeconds < 1) {
      resetInterval();
      endMethod();
      return;
    }
    if (remainingSeconds < warnTime) {
      if (!warningTrigered) {
        warningTrigered = true;
        warnMethod();
      }
    }

    startSessionTimer(remainingSeconds);
  }

  function resetInterval() {
    clearInterval(interval);
    interval = 0;
  }

  function setSpanText(minutes, seconds) {
    if (timerSpanElement) {
      if (timerSpanElement.is('p')) {
        timerSpanElement.text('(' + minutes + ':' + seconds + ')');
      }
    }
  }

  return sessionHandler;
})();