(function ($) {
  "use strict";

  $.fn.extend({
    countdown100: function countdown100(options) {
      var defaults = {
        timeZone: "",
        endtimeYear: 0,
        endtimeMonth: 0,
        endtimeDate: 0,
        endtimeHours: 0,
        endtimeMinutes: 0,
        endtimeSeconds: 0
      };
      var options = $.extend(defaults, options);
      return this.each(function () {
        var obj = $(this);
        var timeNow = new Date();
        var tZ = options.timeZone;
        var endYear = options.endtimeYear;
        var endMonth = options.endtimeMonth;
        var endDate = options.endtimeDate;
        var endHours = options.endtimeHours;
        var endMinutes = options.endtimeMinutes;
        var endSeconds = options.endtimeSeconds;

        if (tZ == "") {
          var deadline = new Date(endYear, endMonth - 1, endDate, endHours, endMinutes, endSeconds);
        } else {
          var deadline = moment.tz([endYear, endMonth - 1, endDate, endHours, endMinutes, endSeconds], tZ).format();
        }

        if (Date.parse(deadline) < Date.parse(timeNow)) {
          deadline = new Date(Date.parse(new Date()) + endDate * 24 * 60 * 60 * 1000 + endHours * 60 * 60 * 1000 + endMinutes * 60 * 1000 + endSeconds * 1000);
        }

        initializeClock(deadline);

        function getTimeRemaining(endtime) {
          var t = Date.parse(endtime) - Date.parse(new Date());
          var seconds = Math.floor(t / 1000 % 60);
          var minutes = Math.floor(t / 1000 / 60 % 60);
          var hours = Math.floor(t / (1000 * 60 * 60) % 24);
          var days = Math.floor(t / (1000 * 60 * 60 * 24));
          return {
            'total': t,
            'days': days,
            'hours': hours,
            'minutes': minutes,
            'seconds': seconds
          };
        }

        function initializeClock(endtime) {
          var daysSpan = $(obj).find('.days');
          var hoursSpan = $(obj).find('.hours');
          var minutesSpan = $(obj).find('.minutes');
          var secondsSpan = $(obj).find('.seconds');

          function updateClock() {
            var t = getTimeRemaining(endtime);
            daysSpan.html(t.days);
            hoursSpan.html(t.hours);
            minutesSpan.html(t.minutes);
            secondsSpan.html(t.seconds);

            if (t.total <= 0) {
              clearInterval(timeinterval);
            }
          }

          updateClock();
          var timeinterval = setInterval(updateClock, 1000);
        }
      });
    }
  });
})(jQuery);