text: // This file is part of Moodle - https://moodle.org/
  //
  // Moodle is free software: you can redistribute it and/or modify
  // it under the terms of the GNU General Public License as published by
  // the Free Software Foundation, either version 3 of the License, or
  // (at your option) any later version.
  //
  // Moodle is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  // GNU General Public License for more details.
  //
  // You should have received a copy of the GNU General Public License
  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  
  /**
   * Provides the required functionality for an autocomplete element to select a user.
   *
   * @module      core_user/form_user_selector
   * @copyright   2020 David Mudrák <david@moodle.com>
   * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
   */
  
  import Ajax from 'core/ajax';
  import {render as renderTemplate} from 'core/templates';
  import {get_string as getString} from 'core/str';
  
  /**
   * Load the list of users matching the query and render the selector labels for them.
   *
   * @param {String} selector The selector of the auto complete element.
   * @param {String} query The query string.
   * @param {Function} callback A callback function receiving an array of results.
   * @param {Function} failure A function to call in case of failure, receiving the error message.
   */
  export async function transport(selector, query, callback, failure) {
  
      const request = {
          methodname: 'core_user_search_identity',
          args: {
              query: query
          }
      };
  
      try {
          const response = await Ajax.call([request])[0];
  
          if (response.overflow) {
              const msg = await getString('toomanyuserstoshow', 'core', '>' + response.maxusersperpage);
              callback(msg);
  
          } else {
              let labels = [];
              response.list.forEach(user => {
                  labels.push(renderTemplate('core_user/form_user_selector_suggestion', user));
              });
              labels = await Promise.all(labels);
  
              response.list.forEach((user, index) => {
                  user.label = labels[index];
              });
  
              callback(response.list);
          }
  
      } catch (e) {
          failure(e);
      }
  }
  
  /**
   * Process the results for auto complete elements.
   *
   * @param {String} selector The selector of the auto complete element.
   * @param {Array} results An array or results returned by {@see transport()}.
   * @return {Array} New array of the selector options.
   */
  export function processResults(selector, results) {
  
      if (!Array.isArray(results)) {
          return results;
  
      } else {
          return results.map(result => ({value: result.id, label: result.label}));
      }
  }
  