(function ($) {

  "use strict";

  Drupal.behaviors.menuUiDetailsSummaries = {
    attach: function (context) {
      $(context).find('.menu-link-form').drupalSetSummary(function (context) {
        var $context = $(context);
        if ($context.find('.form-item-menu-enabled input').is(':checked')) {
          return Drupal.checkPlain($context.find('.form-item-menu-link-title input').val());
        }
        else {
          return Drupal.t('Not in menu');
        }
      });
    }
  };

  /**
   * Automatically fill in a menu link title, if possible.
   */
  Drupal.behaviors.menuUiLinkAutomaticTitle = {
    attach: function (context) {
      var $context = $(context);
      $context.find('.menu-link-form').each(function () {
        var $this = $(this);
        // Try to find menu settings widget elements as well as a 'title' field in
        // the form, but play nicely with user permissions and form alterations.
        var $checkbox = $this.find('.form-item-menu-enabled input');
        var $link_title = $context.find('.form-item-menu-link-title input');
        var $title = $this.closest('form').find('.form-item-title input');
        // Bail out if we do not have all required fields.
        if (!($checkbox.length && $link_title.length && $title.length)) {
          return;
        }
        // If there is a link title already, mark it as overridden. The user expects
        // that toggling the checkbox twice will take over the node's title.
        if ($checkbox.is(':checked') && $link_title.val().length) {
          $link_title.data('menuLinkAutomaticTitleOveridden', true);
        }
        // Whenever the value is changed manually, disable this behavior.
        $link_title.on('keyup', function () {
          $link_title.data('menuLinkAutomaticTitleOveridden', true);
        });
        // Global trigger on checkbox (do not fill-in a value when disabled).
        $checkbox.on('change', function () {
          if ($checkbox.is(':checked')) {
            if (!$link_title.data('menuLinkAutomaticTitleOveridden')) {
              $link_title.val($title.val());
            }
          }
          else {
            $link_title.val('');
            $link_title.removeData('menuLinkAutomaticTitleOveridden');
          }
          $checkbox.closest('.vertical-tabs-pane').trigger('summaryUpdated');
          $checkbox.trigger('formUpdated');
        });
        // Take over any title change.
        $title.on('keyup', function () {
          if (!$link_title.data('menuLinkAutomaticTitleOveridden') && $checkbox.is(':checked')) {
            $link_title.val($title.val());
            $link_title.val($title.val()).trigger('formUpdated');
          }
        });
      });
    }
  };

})(jQuery);