;(function ($, window, document, undefined) {
  'use strict';

  Foundation.libs.accordion = {
    name : 'accordion',

    version : '{{VERSION}}',

    settings : {
      content_class : 'content',
      active_class : 'active',
      multi_expand : false,
      toggleable : true,
      callback : function () {}
    },

    init : function (scope, method, options) {
      this.bindings(method, options);
    },

    events : function (instance) {
      var self = this;
      var S = this.S;
      self.create(this.S(instance));

      S(this.scope)
      .off('.fndtn.accordion')
      .on('click.fndtn.accordion', '[' + this.attr_name() + '] > dd > a:not(.follow), [' + this.attr_name() + '] > li > a:not(.follow)', function (e) {
        var accordion = S(this).closest('[' + self.attr_name() + ']'),
            groupSelector = self.attr_name() + '=' + accordion.attr(self.attr_name()),
            settings = accordion.data(self.attr_name(true) + '-init') || self.settings,
            contentAttr = S(this).context.attributes['data-content'],
            target = S('#' + (contentAttr ? contentAttr.value : this.href.split('#')[1])),
            aunts = $('> dd, > li', accordion),
            siblings = aunts.children('.' + settings.content_class),
            active_content = siblings.filter('.' + settings.active_class);

        e.preventDefault();
        e.stopPropagation();

        if (accordion.attr(self.attr_name())) {
          siblings = siblings.add('[' + groupSelector + '] dd > ' + '.' + settings.content_class + ', [' + groupSelector + '] li > ' + '.' + settings.content_class);
          aunts = aunts.add('[' + groupSelector + '] dd, [' + groupSelector + '] li');
        }

        if (settings.toggleable && target.is(active_content)) {
          target.parent('dd, li').toggleClass(settings.active_class, false);
          target.toggleClass(settings.active_class, false);
          S(this).attr('aria-expanded', function(i, attr){
              return attr === 'true' ? 'false' : 'true';
          });
          settings.callback(target);
          target.triggerHandler('toggled', [accordion]);
          accordion.triggerHandler('toggled', [target]);
          return;
        }

        if (!settings.multi_expand) {
          siblings.removeClass(settings.active_class);
          aunts.removeClass(settings.active_class);
          aunts.children('a').attr('aria-expanded','false');
        }

        target.addClass(settings.active_class).parent().addClass(settings.active_class);
        settings.callback(target);
        target.triggerHandler('toggled', [accordion]);
        accordion.triggerHandler('toggled', [target]);
        S(this).attr('aria-expanded','true');
      });
    },

    create: function($instance) {
      var self = this,
          accordion = $instance,
          aunts = $('> .accordion-navigation', accordion),
          settings = accordion.data(self.attr_name(true) + '-init') || self.settings;

      aunts.children('a').attr('aria-expanded','false');
      aunts.has('.' + settings.content_class + '.' + settings.active_class).addClass(settings.active_class).children('a').attr('aria-expanded','true');

      if (settings.multi_expand) {
        $instance.attr('aria-multiselectable','true');
      }
    },
	
  	toggle : function(options) {
  		var options = typeof options !== 'undefined' ? options : {};
  		var selector = typeof options.selector !== 'undefined' ? options.selector : '';
  		var toggle_state = typeof options.toggle_state !== 'undefined' ? options.toggle_state : '';
  		var $accordion = typeof options.$accordion !== 'undefined' ? options.$accordion : this.S(this.scope).closest('[' + this.attr_name() + ']');
  
  		var $items = $accordion.find('> dd' + selector + ', > li' + selector);
  		if ( $items.length < 1 ) {
  			if ( window.console ) {
  				console.error('Selection not found.', selector);
  			}
  			return false;
  		}
  
  		var S = this.S;
  		var active_class = this.settings.active_class;
  		$items.each(function() {
  			var $item = S(this);
  			var is_active = $item.hasClass(active_class);
  			if ( ( is_active && toggle_state === 'close' ) || ( !is_active && toggle_state === 'open' ) || toggle_state === '' ) {
  				$item.find('> a').trigger('click.fndtn.accordion');
  			}
  		});
  	},
  
  	open : function(options) {
  		var options = typeof options !== 'undefined' ? options : {};
  		options.toggle_state = 'open';
  		this.toggle(options);
  	},
  
  	close : function(options) {
  		var options = typeof options !== 'undefined' ? options : {};
  		options.toggle_state = 'close';
  		this.toggle(options);
  	},	

    off : function () {},

    reflow : function () {}
  };
}(jQuery, window, window.document));