<?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/>.

/**
 * Edit course settings
 *
 * @package    moodlecore
 * @copyright  1999 onwards Martin Dougiamas (http://dougiamas.com)
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require_once('../config.php');
require_once('lib.php');
require_once('edit_form.php');

$id         = optional_param('id', 0, PARAM_INT);       // course id
$categoryid = optional_param('category', 0, PARAM_INT); // course category - can be changed in edit form
$returnto = optional_param('returnto', 0, PARAM_ALPHANUM); // generic navigation return page switch

$PAGE->set_pagelayout('admin');
$PAGE->set_url('/course/edit.php');

// basic access control checks
if ($id) { // editing course
    if ($id == SITEID){
        // don't allow editing of  'site course' using this from
        print_error('cannoteditsiteform');
    }

    $course = $DB->get_record('course', array('id'=>$id), '*', MUST_EXIST);
    require_login($course);
    $category = $DB->get_record('course_categories', array('id'=>$course->category), '*', MUST_EXIST);
    $coursecontext = get_context_instance(CONTEXT_COURSE, $course->id);
    require_capability('moodle/course:update', $coursecontext);
    $PAGE->url->param('id',$id);

} else if ($categoryid) { // creating new course in this category
    $course = null;
    require_login();
    $category = $DB->get_record('course_categories', array('id'=>$categoryid), '*', MUST_EXIST);
    $catcontext = get_context_instance(CONTEXT_COURSECAT, $category->id);
    require_capability('moodle/course:create', $catcontext);
    $PAGE->url->param('category',$categoryid);
    $PAGE->set_context($catcontext);

} else {
    require_login();
    print_error('needcoursecategroyid');
}

// Prepare course and the editor
$editoroptions = array('maxfiles' => EDITOR_UNLIMITED_FILES, 'maxbytes'=>$CFG->maxbytes, 'trusttext'=>false, 'noclean'=>true);
if (!empty($course)) {
    $allowedmods = array();
    if ($am = $DB->get_records('course_allowed_modules', array('course'=>$course->id))) {
        foreach ($am as $m) {
            $allowedmods[] = $m->module;
        }
    } else {
        // this happens in case we edit course created before enabling module restrictions or somebody disabled everything :-(
        if (empty($course->restrictmodules) and !empty($CFG->defaultallowedmodules)) {
            $allowedmods = explode(',', $CFG->defaultallowedmodules);
        }
    }
    $course->allowedmods = $allowedmods;
    //add context for editor
    $editoroptions['context'] = $coursecontext;
    $course = file_prepare_standard_editor($course, 'summary', $editoroptions, $coursecontext, 'course', 'summary', 0);

} else {
    //editor should respect category context if course context is not set.
    $editoroptions['context'] = $catcontext;
    $course = file_prepare_standard_editor($course, 'summary', $editoroptions, null, 'course', 'summary', null);

    // Set up the default restricted module list
    if (!empty($CFG->restrictbydefault)) {
        if (!empty($CFG->defaultallowedmodules)) {
            $course->allowedmods = explode(',', $CFG->defaultallowedmodules);
        }
    }
}

// first create the form
$editform = new course_edit_form(NULL, array('course'=>$course, 'category'=>$category, 'editoroptions'=>$editoroptions, 'returnto'=>$returnto));
if ($editform->is_cancelled()) {
        switch ($returnto) {
            case 'category':
                $url = new moodle_url($CFG->wwwroot.'/course/category.php', array('id'=>$categoryid));
                break;
            case 'topcat':
                $url = new moodle_url($CFG->wwwroot.'/course/');
                break;
            default:
                if (!empty($course->id)) {
                    $url = new moodle_url($CFG->wwwroot.'/course/view.php', array('id'=>$course->id));
                } else {
                    $url = new moodle_url($CFG->wwwroot.'/course/');
                }
                break;
        }
        redirect($url);

} else if ($data = $editform->get_data()) {
    // process data if submitted

    if (empty($course->id)) {
        // In creating the course
        $course = create_course($data, $editoroptions);

        // Get the context of the newly created course
        $context = get_context_instance(CONTEXT_COURSE, $course->id, MUST_EXIST);

        if (!empty($CFG->creatornewroleid) and !is_viewing($context, NULL, 'moodle/role:assign') and !is_enrolled($context, NULL, 'moodle/role:assign')) {
            // deal with course creators - enrol them internally with default role
            enrol_try_internal_enrol($course->id, $USER->id, $CFG->creatornewroleid);

        }
        if (!is_enrolled($context)) {
            // Redirect to manual enrolment page if possible
            $instances = enrol_get_instances($course->id, true);
            foreach($instances as $instance) {
                if ($plugin = enrol_get_plugin($instance->enrol)) {
                    if ($plugin->get_manual_enrol_link($instance)) {
                        // we know that the ajax enrol UI will have an option to enrol
                        redirect(new moodle_url('/enrol/users.php', array('id'=>$course->id)));
                    }
                }
            }
        }
    } else {
        // Save any changes to the files used in the editor
        update_course($data, $editoroptions);
    }

    switch ($returnto) {
        case 'category':
        case 'topcat': //redirecting to where the new course was created by default.
            $url = new moodle_url($CFG->wwwroot.'/course/category.php', array('id'=>$categoryid));
            break;
        default:
            $url = new moodle_url($CFG->wwwroot.'/course/view.php', array('id'=>$course->id));
            break;
    }
    redirect($url);
}


// Print the form

$site = get_site();

$streditcoursesettings = get_string("editcoursesettings");
$straddnewcourse = get_string("addnewcourse");
$stradministration = get_string("administration");
$strcategories = get_string("categories");

if (!empty($course->id)) {
    $PAGE->navbar->add($streditcoursesettings);
    $title = $streditcoursesettings;
    $fullname = $course->fullname;
} else {
    $PAGE->navbar->add($stradministration, new moodle_url('/admin/index.php'));
    $PAGE->navbar->add($strcategories, new moodle_url('/course/index.php'));
    $PAGE->navbar->add($straddnewcourse);
    $title = "$site->shortname: $straddnewcourse";
    $fullname = $site->fullname;
}

$PAGE->set_title($title);
$PAGE->set_heading($fullname);

echo $OUTPUT->header();
echo $OUTPUT->heading($streditcoursesettings);

$editform->display();

echo $OUTPUT->footer();