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// This file is part of Moodle - http://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/>.

/**
 * Load the nav tree items via ajax and render the response.
 *
 * @module     block_navigation/nav_loader
 * @package    core
 * @copyright  2015 John Okely <john@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
define(['jquery', 'core/ajax', 'core/config', 'block_navigation/ajax_response_renderer'],
    function($, ajax, config, renderer) {
        var URL = config.wwwroot + '/lib/ajax/getnavbranch.php';

/**
         * Get the block instance id.
         *
         * @function getBlockInstanceId
         * @param {Element} element
         * @returns {String} the instance id
         */
        function getBlockInstanceId(element) {
            return element.closest('[data-block]').attr('data-instanceid');
        }

return {
        load: function(element) {
            element = $(element);
            var promise = $.Deferred();
            var data = {
                elementid: element.attr('data-node-id'),
                id: element.attr('data-node-key'),
                type: element.attr('data-node-type'),
                sesskey: config.sesskey,
                instance: getBlockInstanceId(element)
            };
            var settings = {
                type: 'POST',
                dataType: 'json',
                data: data
            };

$.ajax(URL, settings).done(function(nodes) {
                renderer.render(element, nodes);
                promise.resolve();
            });

return promise;
        }
    };
});