(function ($) {
  $.fn.collapsible = function(options, methodParam) {
    var defaults = {
      accordion: undefined,
      onOpen: undefined,
      onClose: undefined
    };

    var methodName = options;
    options = $.extend(defaults, options);


    return this.each(function() {

      var $this = $(this);

      var $panel_headers = $(this).find('> li > .collapsible-header');

      var collapsible_type = $this.data("collapsible");

      /****************
      Helper Functions
      ****************/

      // Accordion Open
      function accordionOpen(object) {
        $panel_headers = $this.find('> li > .collapsible-header');
        if (object.hasClass('active')) {
          object.parent().addClass('active');
        }
        else {
          object.parent().removeClass('active');
        }
        if (object.parent().hasClass('active')){
          object.siblings('.collapsible-body').stop(true,false).slideDown({ duration: 350, easing: "easeOutQuart", queue: false, complete: function() {$(this).css('height', '');}});
        }
        else{
          object.siblings('.collapsible-body').stop(true,false).slideUp({ duration: 350, easing: "easeOutQuart", queue: false, complete: function() {$(this).css('height', '');}});
        }

        $panel_headers.not(object).removeClass('active').parent().removeClass('active');

        // Close previously open accordion elements.
        $panel_headers.not(object).parent().children('.collapsible-body').stop(true,false).each(function() {
          if ($(this).is(':visible')) {
            $(this).slideUp({
              duration: 350,
              easing: "easeOutQuart",
              queue: false,
              complete:
                function() {
                  $(this).css('height', '');
                  execCallbacks($(this).siblings('.collapsible-header'));
                }
            });
          }
        });
      }

      // Expandable Open
      function expandableOpen(object) {
        if (object.hasClass('active')) {
          object.parent().addClass('active');
        }
        else {
          object.parent().removeClass('active');
        }
        if (object.parent().hasClass('active')){
          object.siblings('.collapsible-body').stop(true,false).slideDown({ duration: 350, easing: "easeOutQuart", queue: false, complete: function() {$(this).css('height', '');}});
        }
        else {
          object.siblings('.collapsible-body').stop(true,false).slideUp({ duration: 350, easing: "easeOutQuart", queue: false, complete: function() {$(this).css('height', '');}});
        }
      }

      // Open collapsible. object: .collapsible-header
      function collapsibleOpen(object, noToggle) {
        if (!noToggle) {
          object.toggleClass('active');
        }

        if (options.accordion || collapsible_type === "accordion" || collapsible_type === undefined) { // Handle Accordion
          accordionOpen(object);
        } else { // Handle Expandables
          expandableOpen(object);
        }

        execCallbacks(object);
      }

      // Handle callbacks
      function execCallbacks(object) {
        if (object.hasClass('active')) {
          if (typeof(options.onOpen) === "function") {
            options.onOpen.call(this, object.parent());
          }
        } else {
          if (typeof(options.onClose) === "function") {
            options.onClose.call(this, object.parent());
          }
        }
      }

      /**
       * Check if object is children of panel header
       * @param  {Object}  object Jquery object
       * @return {Boolean} true if it is children
       */
      function isChildrenOfPanelHeader(object) {

        var panelHeader = getPanelHeader(object);

        return panelHeader.length > 0;
      }

      /**
       * Get panel header from a children element
       * @param  {Object} object Jquery object
       * @return {Object} panel header object
       */
      function getPanelHeader(object) {

        return object.closest('li > .collapsible-header');
      }


      // Turn off any existing event handlers
      function removeEventHandlers() {
        $this.off('click.collapse', '> li > .collapsible-header');
      }

      /*****  End Helper Functions  *****/


      // Methods
      if (methodName === 'destroy') {
        removeEventHandlers();
        return;
      } else if (methodParam >= 0 &&
          methodParam < $panel_headers.length) {
        var $curr_header = $panel_headers.eq(methodParam);
        if ($curr_header.length &&
            (methodName === 'open' ||
            (methodName === 'close' &&
            $curr_header.hasClass('active')))) {
          collapsibleOpen($curr_header);
        }
        return;
      }


      removeEventHandlers();


      // Add click handler to only direct collapsible header children
      $this.on('click.collapse', '> li > .collapsible-header', function(e) {
        var element = $(e.target);

        if (isChildrenOfPanelHeader(element)) {
          element = getPanelHeader(element);
        }

        collapsibleOpen(element);
      });


      // Open first active
      if (options.accordion || collapsible_type === "accordion" || collapsible_type === undefined) { // Handle Accordion
        collapsibleOpen($panel_headers.filter('.active').first(), true);

      } else { // Handle Expandables
        $panel_headers.filter('.active').each(function() {
          collapsibleOpen($(this), true);
        });
      }

    });
  };

  $(document).ready(function(){
    $('.collapsible').collapsible();
  });
}( jQuery ));