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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/>.

/**
 * Potential user selector module.
 *
 * @module     enrol_manual/form-potential-user-selector
 * @class      form-potential-user-selector
 * @package    enrol_manual
 * @copyright  2016 Damyon Wiese
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

define(['jquery', 'core/ajax', 'core/templates', 'core/str'], function($, Ajax, Templates, Str) {

return /** @alias module:enrol_manual/form-potential-user-selector */ {

processResults: function(selector, results) {
            var users = [];
            if ($.isArray(results)) {
                $.each(results, function(index, user) {
                    users.push({
                        value: user.id,
                        label: user._label
                    });
                });
                return users;

} else {
                return results;
            }
        },

transport: function(selector, query, success, failure) {
            var promise;
            var courseid = $(selector).attr('courseid');
            var userfields = $(selector).attr('userfields').split(',');
            if (typeof courseid === "undefined") {
                courseid = '1';
            }
            var enrolid = $(selector).attr('enrolid');
            if (typeof enrolid === "undefined") {
                enrolid = '';
            }
            var perpage = parseInt($(selector).attr('perpage'));
            if (isNaN(perpage)) {
                perpage = 100;
            }

promise = Ajax.call([{
                methodname: 'core_enrol_get_potential_users',
                args: {
                    courseid: courseid,
                    enrolid: enrolid,
                    search: query,
                    searchanywhere: true,
                    page: 0,
                    perpage: perpage + 1
                }
            }]);

promise[0].then(function(results) {
                var promises = [],
                    i = 0;

if (results.length <= perpage) {
                    // Render the label.
                    $.each(results, function(index, user) {
                        var ctx = user,
                            identity = [];
                        $.each(userfields, function(i, k) {
                            if (typeof user[k] !== 'undefined' && user[k] !== '') {
                                ctx.hasidentity = true;
                                identity.push(user[k]);
                            }
                        });
                        ctx.identity = identity.join(', ');
                        promises.push(Templates.render('enrol_manual/form-user-selector-suggestion', ctx));
                    });

// Apply the label to the results.
                    return $.when.apply($.when, promises).then(function() {
                        var args = arguments;
                        $.each(results, function(index, user) {
                            user._label = args[i];
                            i++;
                        });
                        success(results);
                        return;
                    });

} else {
                    return Str.get_string('toomanyuserstoshow', 'core', '>' + perpage).then(function(toomanyuserstoshow) {
                        success(toomanyuserstoshow);
                        return;
                    });
                }

}).fail(failure);
        }

};

});