/**
 * @file
 * Attaches behavior for the Filter module.
 */

(function ($, Drupal) {

  'use strict';

  /**
   * Displays the guidelines of the selected text format automatically.
   *
   * @type {Drupal~behavior}
   *
   * @prop {Drupal~behaviorAttach} attach
   *   Attaches behavior for updating filter guidelines.
   */
  Drupal.behaviors.filterGuidelines = {
    attach: function (context) {

      function updateFilterGuidelines(event) {
        var $this = $(event.target);
        var value = $this.val();
        $this.closest('.filter-wrapper')
          .find('.filter-guidelines-item').hide()
          .filter('.filter-guidelines-' + value).show();
      }

      $(context).find('.filter-guidelines').once('filter-guidelines')
        .find(':header').hide()
        .closest('.filter-wrapper').find('select.filter-list')
        .on('change.filterGuidelines', updateFilterGuidelines)
        // Need to trigger the namespaced event to avoid triggering formUpdated
        // when initializing the select.
        .trigger('change.filterGuidelines');
    }
  };

})(jQuery, Drupal);
