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/**
 * @file
 * User permission page behaviors.
 */

(function ($, Drupal) {
  /**
   * Shows checked and disabled checkboxes for inherited permissions.
   *
   * @type {Drupal~behavior}
   *
   * @prop {Drupal~behaviorAttach} attach
   *   Attaches functionality to the permissions table.
   */
  Drupal.behaviors.permissions = {
    attach(context) {
      once('permissions', 'table#permissions').forEach((table) => {
        // On a site with many roles and permissions, this behavior initially
        // has to perform thousands of DOM manipulations to inject checkboxes
        // and hide them. By detaching the table from the DOM, all operations
        // can be performed without triggering internal layout and re-rendering
        // processes in the browser.
        const $table = $(table);
        let $ancestor;
        let method;
        if ($table.prev().length) {
          $ancestor = $table.prev();
          method = 'after';
        } else {
          $ancestor = $table.parent();
          method = 'append';
        }
        $table.detach();

        // Create dummy checkboxes. We use dummy checkboxes instead of reusing
        // the existing checkboxes here because new checkboxes don't alter the
        // submitted form. If we'd automatically check existing checkboxes, the
        // permission table would be polluted with redundant entries. This is
        // deliberate, but desirable when we automatically check them.
        const $dummy = $(Drupal.theme('checkbox'))
          .removeClass('form-checkbox')
          .addClass('dummy-checkbox js-dummy-checkbox')
          .attr('disabled', 'disabled')
          .attr('checked', 'checked')
          .attr(
            'title',
            Drupal.t(
              'This permission is inherited from the authenticated user role.',
            ),
          )
          .hide();

        $table
          .find('input[type="checkbox"]')
          .not('.js-rid-anonymous, .js-rid-authenticated')
          .addClass('real-checkbox js-real-checkbox')
          .after($dummy);

        // Initialize the authenticated user checkbox.
        $table
          .find('input[type=checkbox].js-rid-authenticated')
          .on('click.permissions', this.toggle)
          // .triggerHandler() cannot be used here, as it only affects the first
          // element.
          .each(this.toggle);

        // Re-insert the table into the DOM.
        $ancestor[method]($table);
      });
    },

    /**
     * Toggles all dummy checkboxes based on the checkboxes' state.
     *
     * If the "authenticated user" checkbox is checked, the checked and disabled
     * checkboxes are shown, the real checkboxes otherwise.
     */
    toggle() {
      const authCheckbox = this;
      const $row = $(this).closest('tr');
      // jQuery performs too many layout calculations for .hide() and .show(),
      // leading to a major page rendering lag on sites with many roles and
      // permissions. Therefore, we toggle visibility directly.
      $row.find('.js-real-checkbox').each(function () {
        this.style.display = authCheckbox.checked ? 'none' : '';
      });
      $row.find('.js-dummy-checkbox').each(function () {
        this.style.display = authCheckbox.checked ? '' : 'none';
      });
    },
  };
})(jQuery, Drupal);