<?php
// 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/>.

/**
 * Wrapper script redirecting user operations to correct destination.
 *
 * @copyright 1999 Martin Dougiamas  http://dougiamas.com
 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @package core_user
 */

require_once("../config.php");

$formaction = required_param('formaction', PARAM_LOCALURL);
$id = required_param('id', PARAM_INT);

$PAGE->set_url('/user/action_redir.php', array('formaction' => $formaction, 'id' => $id));
list($formaction) = explode('?', $formaction, 2);

// This page now only handles the bulk enrolment change actions, other actions are done with ajax.
$actions = array('bulkchange.php');

if (array_search($formaction, $actions) === false) {
    print_error('unknownuseraction');
}

if (!confirm_sesskey()) {
    print_error('confirmsesskeybad');
}

if ($formaction == 'bulkchange.php') {
    // Backwards compatibility for enrolment plugins bulk change functionality.
    // This awful code is adapting from the participant page with it's param names and values
    // to the values expected by the bulk enrolment changes forms.
    $formaction = required_param('formaction', PARAM_URL);
    require_once($CFG->dirroot . '/enrol/locallib.php');

    $url = new moodle_url($formaction);
    // Get the enrolment plugin type and bulk action from the url.
    $plugin = $url->param('plugin');
    $operationname = $url->param('operation');

    $course = $DB->get_record('course', array('id' => $id), '*', MUST_EXIST);
    $context = context_course::instance($id);
    $PAGE->set_context($context);

    $instances = enrol_get_instances($course->id, false);
    $instance = false;
    foreach ($instances as $oneinstance) {
        if ($oneinstance->enrol == $plugin) {
            $instance = $oneinstance;
            break;
        }
    }
    if (!$instance) {
        print_error('errorwithbulkoperation', 'enrol');
    }

    $manager = new course_enrolment_manager($PAGE, $course, $instance->id);
    $plugins = $manager->get_enrolment_plugins();

    if (!isset($plugins[$plugin])) {
        print_error('errorwithbulkoperation', 'enrol');
    }

    $plugin = $plugins[$plugin];

    $operations = $plugin->get_bulk_operations($manager);

    if (!isset($operations[$operationname])) {
        print_error('errorwithbulkoperation', 'enrol');
    }
    $operation = $operations[$operationname];

    $userids = optional_param_array('userid', array(), PARAM_INT);
    $default = new moodle_url('/user/index.php', ['id' => $course->id]);
    $returnurl = new moodle_url(optional_param('returnto', $default, PARAM_URL));

    if (empty($userids)) {
        $userids = optional_param_array('bulkuser', array(), PARAM_INT);
    }
    if (empty($userids)) {
        // The first time list hack.
        if (empty($userids) and $post = data_submitted()) {
            foreach ($post as $k => $v) {
                if (preg_match('/^user(\d+)$/', $k, $m)) {
                    $userids[] = $m[1];
                }
            }
        }
    }

    if (empty($userids)) {
        redirect($returnurl, get_string('noselectedusers', 'bulkusers'));
    }

    $users = $manager->get_users_enrolments($userids);

    $removed = array_diff($userids, array_keys($users));
    if (!empty($removed)) {
        // This manager does not filter by enrolment method - so we can get the removed users details.
        $removedmanager = new course_enrolment_manager($PAGE, $course);
        $removedusers = $removedmanager->get_users_enrolments($removed);

        foreach ($removedusers as $removeduser) {
            $msg = get_string('userremovedfromselectiona', 'enrol', fullname($removeduser));
            \core\notification::warning($msg);
        }
    }

    // We may have users from any kind of enrolment, we need to filter for the enrolment plugin matching the bulk action.
    $matchesplugin = function($user) use ($plugin) {
        foreach ($user->enrolments as $enrolment) {
            if ($enrolment->enrolmentplugin->get_name() == $plugin->get_name()) {
                return true;
            }
        }
        return false;
    };
    $filteredusers = array_filter($users, $matchesplugin);

    if (empty($filteredusers)) {
        redirect($returnurl, get_string('noselectedusers', 'bulkusers'));
    }

    $users = $filteredusers;

    // Get the form for the bulk operation.
    $mform = $operation->get_form($PAGE->url, array('users' => $users));
    // If the mform is false then attempt an immediate process. This may be an immediate action that
    // doesn't require user input OR confirmation.... who know what but maybe one day.
    if ($mform === false) {
        if ($operation->process($manager, $users, new stdClass)) {
            redirect($returnurl);
        } else {
            print_error('errorwithbulkoperation', 'enrol');
        }
    }
    // Check if the bulk operation has been cancelled.
    if ($mform->is_cancelled()) {
        redirect($returnurl);
    }
    if ($mform->is_submitted() && $mform->is_validated() && confirm_sesskey()) {
        if ($operation->process($manager, $users, $mform->get_data())) {
            redirect($returnurl);
        }
    }

    $pagetitle = get_string('bulkuseroperation', 'enrol');

    $PAGE->set_title($pagetitle);
    $PAGE->set_heading($pagetitle);
    echo $OUTPUT->header();
    echo $OUTPUT->heading($operation->get_title());
    $mform->display();
    echo $OUTPUT->footer();
    exit();

} else {
    throw new coding_exception('invalidaction');
}