(function ($) {

      /**
       * Add functions as jQuery callback
       */
      
      $(document).ready(function () {
            $('.header-container').ipFixNavbar();
            $('#back-to-top').ipBackToTop();
      });

      /**
       * Fixed navigation bar
       * Hide while scrolling down
       * Show when going up
       */
      $.fn.ipFixNavbar = function () { 
            if (ipTheme.fixedNavbar !== 'fixed') return;

            var el = this;
            el.parent().css('min-height', el.innerHeight() + 'px');

            $(window).on('resize', function () {
                  el.parent().css('min-height', 0);
                  el.parent().css('min-height', el.innerHeight() + 'px');
            });

            if (el.hasClass('header-type_logo_center')) {
                  var threshold = 240;
            } else {
                  var threshold = 96;
            }

            var lastTop = $(window).scrollTop();
            var isGoingUp = false;

            $(window).on('scroll', function () {

                  if ($(window).scrollTop() < lastTop) {
                        isGoingUp = true;
                  } else {
                        isGoingUp = false;
                  }

                  lastTop = $(window).scrollTop();

                  if ($(window).scrollTop() > threshold && !el.hasClass('navigation-fixed') ) {
                        el
                              .addClass('navigation-fixed')
                              .removeClass('navigation-initial');
                  }

                  if (isGoingUp && !el.hasClass('navigation-fixed')) {
                        el
                              .addClass('navigation-fixed')
                              .removeClass('navigation-initial');
                  }

                  if (!isGoingUp && el.hasClass('navigation-fixed')) {
                        el
                              .removeClass('navigation-fixed')
                              .addClass('navigation-initial');
                  }

                  if ($(window).scrollTop() < threshold && el.hasClass('navigation-fixed')) {
                        el
                              .removeClass('navigation-fixed')
                              .removeClass('navigation-initial');
                  }
            });
      };

      /**
       * Back to top button
       * Show if scrolled more than 300px
       */
      $.fn.ipBackToTop = function () {
            if (ipTheme.backToTop !== 'show') return;

            var el = this;

            el.on('click', function (e) {
                  e.preventDefault();
                  $('html').animate({
                        scrollTop: 0
                  }, 500);
            });

            $(window).on('scroll', function () {
                  if ($(window).scrollTop() > 300 && !el.hasClass('back-to-top-showing')) {
                        el.addClass('back-to-top-showing');
                  }

                  if ($(window).scrollTop() < 300 && el.hasClass('back-to-top-showing')) {
                        el.removeClass('back-to-top-showing');
                  }
            });
      };

})(jQuery);