<?php

< 
< //  Display the course home page.



> // 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/>.
> 
> /**
>  * Display the course home page.
>  *
>  * @copyright 1999 Martin Dougiamas  http://dougiamas.com
>  * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
>  * @package core_course
>  */



    require_once('../config.php');
    require_once('lib.php');
    require_once($CFG->libdir.'/completionlib.php');

    redirect_if_major_upgrade_required();

    $id          = optional_param('id', 0, PARAM_INT);
    $name        = optional_param('name', '', PARAM_TEXT);
    $edit        = optional_param('edit', -1, PARAM_BOOL);
    $hide        = optional_param('hide', 0, PARAM_INT);
    $show        = optional_param('show', 0, PARAM_INT);

> $duplicatesection = optional_param('duplicatesection', 0, PARAM_INT);


    $idnumber    = optional_param('idnumber', '', PARAM_RAW);
    $sectionid   = optional_param('sectionid', 0, PARAM_INT);
    $section     = optional_param('section', 0, PARAM_INT);

> $expandsection = optional_param('expandsection', -1, PARAM_INT);


    $move        = optional_param('move', 0, PARAM_INT);
    $marker      = optional_param('marker',-1 , PARAM_INT);
    $switchrole  = optional_param('switchrole',-1, PARAM_INT); // Deprecated, use course/switchrole.php instead.
    $return      = optional_param('return', 0, PARAM_LOCALURL);


<     $params = array();



> $params = [];


    if (!empty($name)) {

<         $params = array('shortname' => $name);



>     $params = ['shortname' => $name];


    } else if (!empty($idnumber)) {

<         $params = array('idnumber' => $idnumber);



>     $params = ['idnumber' => $idnumber];


    } else if (!empty($id)) {

<         $params = array('id' => $id);



>     $params = ['id' => $id];


    }else {
        throw new \moodle_exception('unspecifycourseid', 'error');
    }

    $course = $DB->get_record('course', $params, '*', MUST_EXIST);


<     $urlparams = array('id' => $course->id);



> $urlparams = ['id' => $course->id];




<     // Sectionid should get priority over section number



> // Sectionid should get priority over section number.


    if ($sectionid) {

<         $section = $DB->get_field('course_sections', 'section', array('id' => $sectionid, 'course' => $course->id), MUST_EXIST);



>     $section = $DB->get_field('course_sections', 'section', ['id' => $sectionid, 'course' => $course->id], MUST_EXIST);


    }
    if ($section) {
        $urlparams['section'] = $section;
    }

> if ($expandsection !== -1) {

>     $urlparams['expandsection'] = $expandsection;
    $PAGE->set_url('/course/view.php', $urlparams); // Defined here to avoid notices on errors etc
> }



<     $PAGE->set_url('/course/view.php', $urlparams); // Defined here to avoid notices on errors etc



> $PAGE->set_url('/course/view.php', $urlparams); // Defined here to avoid notices on errors etc.



<     // Prevent caching of this page to stop confusion when changing page after making AJAX changes



> // Prevent caching of this page to stop confusion when changing page after making AJAX changes.


    $PAGE->set_cacheable(false);

    context_helper::preload_course($course->id);
    $context = context_course::instance($course->id, MUST_EXIST);


<     // Remove any switched roles before checking login



> // Remove any switched roles before checking login.


    if ($switchrole == 0 && confirm_sesskey()) {
        role_switch($switchrole, $context);
    }

    require_login($course);

    // Switchrole - sanity check in cost-order...

<     $reset_user_allowed_editing = false;



> $resetuserallowedediting = false;


    if ($switchrole > 0 && confirm_sesskey() &&
        has_capability('moodle/role:switchroles', $context)) {

<         // is this role assignable in this context?
<         // inquiring minds want to know...



>     // Is this role assignable in this context?
>     // Inquiring minds want to know.


        $aroles = get_switchable_roles($context);
        if (is_array($aroles) && isset($aroles[$switchrole])) {
            role_switch($switchrole, $context);

<             // Double check that this role is allowed here



>         // Double check that this role is allowed here.


            require_login($course);
        }

<         // reset course page state - this prevents some weird problems ;-)



>     // Reset course page state. This prevents some weird problems.


        $USER->activitycopy = false;

<         $USER->activitycopycourse = NULL;



>     $USER->activitycopycourse = null;


        unset($USER->activitycopyname);
        unset($SESSION->modform);
        $USER->editing = 0;

<         $reset_user_allowed_editing = true;



>     $resetuserallowedediting = true;


    }

    //If course is hosted on an external server, redirect to corresponding

<     //url with appropriate authentication attached as parameter



> // url with appropriate authentication attached as parameter.


    if (file_exists($CFG->dirroot .'/course/externservercourse.php')) {

<         include $CFG->dirroot .'/course/externservercourse.php';



>     include($CFG->dirroot . '/course/externservercourse.php');


        if (function_exists('extern_server_course')) {

<             if ($extern_url = extern_server_course($course)) {
<                 redirect($extern_url);



>         if ($externurl = extern_server_course($course)) {
>             redirect($externurl);


            }
        }
    }


< 
<     require_once($CFG->dirroot.'/calendar/lib.php');    /// This is after login because it needs $USER



> require_once($CFG->dirroot.'/calendar/lib.php'); // This is after login because it needs $USER.



    // Must set layout before gettting section info. See MDL-47555.
    $PAGE->set_pagelayout('course');
    $PAGE->add_body_class('limitedwidth');


<     if ($section and $section > 0) {



> if ($section && $section > 0) {



        // Get section details and check it exists.
        $modinfo = get_fast_modinfo($course);
        $coursesections = $modinfo->get_section_info($section, MUST_EXIST);

        // Check user is allowed to see it.
        if (!$coursesections->uservisible) {
            // Check if coursesection has conditions affecting availability and if
            // so, output availability info.
            if ($coursesections->visible && $coursesections->availableinfo) {
                $sectionname     = get_section_name($course, $coursesections);
                $message = get_string('notavailablecourse', '', $sectionname);
                redirect(course_get_url($course), $message, null, \core\output\notification::NOTIFY_ERROR);
            } else {
                // Note: We actually already know they don't have this capability
                // or uservisible would have been true; this is just to get the
                // correct error message shown.
                require_capability('moodle/course:viewhiddensections', $context);
            }
        }
    }


<     // Fix course format if it is no longer installed



> // Fix course format if it is no longer installed.


    $format = course_get_format($course);
    $course->format = $format->get_format();

    $PAGE->set_pagetype('course-view-' . $course->format);
    $PAGE->set_other_editing_capability('moodle/course:update');
    $PAGE->set_other_editing_capability('moodle/course:manageactivities');
    $PAGE->set_other_editing_capability('moodle/course:activityvisibility');
    if (course_format_uses_sections($course->format)) {
        $PAGE->set_other_editing_capability('moodle/course:sectionvisibility');
        $PAGE->set_other_editing_capability('moodle/course:movesections');
    }

    // Preload course format renderer before output starts.
    // This is a little hacky but necessary since

<     // format.php is not included until after output starts
<     $format->get_renderer($PAGE);



> // format.php is not included until after output starts.
> $renderer = $format->get_renderer($PAGE);




<     if ($reset_user_allowed_editing) {
<         // ugly hack



> if ($resetuserallowedediting) {
>     // Ugly hack.


        unset($PAGE->_user_allowed_editing);
    }

    if (!isset($USER->editing)) {
        $USER->editing = 0;
    }
    if ($PAGE->user_allowed_editing()) {

<         if (($edit == 1) and confirm_sesskey()) {



>     if (($edit == 1) && confirm_sesskey()) {


            $USER->editing = 1;

<             // Redirect to site root if Editing is toggled on frontpage



>         // Redirect to site root if Editing is toggled on frontpage.


            if ($course->id == SITEID) {
                redirect($CFG->wwwroot .'/?redirect=0');
            } else if (!empty($return)) {
                redirect($CFG->wwwroot . $return);
            } else {

<                 $url = new moodle_url($PAGE->url, array('notifyeditingon' => 1));



>             $url = new moodle_url($PAGE->url, ['notifyeditingon' => 1]);


                redirect($url);
            }

<         } else if (($edit == 0) and confirm_sesskey()) {



>     } else if (($edit == 0) && confirm_sesskey()) {


            $USER->editing = 0;
            if(!empty($USER->activitycopy) && $USER->activitycopycourse == $course->id) {
                $USER->activitycopy       = false;

<                 $USER->activitycopycourse = NULL;



>             $USER->activitycopycourse = null;


            }

<             // Redirect to site root if Editing is toggled on frontpage



>         // Redirect to site root if Editing is toggled on frontpage.


            if ($course->id == SITEID) {
                redirect($CFG->wwwroot .'/?redirect=0');
            } else if (!empty($return)) {
                redirect($CFG->wwwroot . $return);
            } else {
                redirect($PAGE->url);
            }
        }

        if (has_capability('moodle/course:sectionvisibility', $context)) {
            if ($hide && confirm_sesskey()) {
                set_section_visible($course->id, $hide, '0');
                redirect($PAGE->url);
            }

            if ($show && confirm_sesskey()) {
                set_section_visible($course->id, $show, '1');
                redirect($PAGE->url);
            }
        }


>     if (
        if (!empty($section) && !empty($move) &&
>         !empty($section) && !empty($coursesections) && !empty($duplicatesection)
                has_capability('moodle/course:movesections', $context) && confirm_sesskey()) {
>         && has_capability('moodle/course:update', $context) && confirm_sesskey()
            $destsection = $section + $move;
>     ) {
            if (move_section_to($course, $section, $destsection)) {
>         $newsection = $format->duplicate_section($coursesections);
                if ($course->id == SITEID) {
>         redirect(course_get_url($course, $newsection->section));
                    redirect($CFG->wwwroot . '/?redirect=0');
>     }
                } else {
> 


                    if ($format->get_course_display() == COURSE_DISPLAY_MULTIPAGE) {
                        redirect(course_get_url($course));
                    } else {
                        redirect(course_get_url($course, $destsection));
                    }
                }
            } else {
                echo $OUTPUT->notification('An error occurred while moving a section');
            }
        }
    } else {
        $USER->editing = 0;
    }

    $SESSION->fromdiscussion = $PAGE->url->out(false);


    if ($course->id == SITEID) {
        // This course is not a real course.
        redirect($CFG->wwwroot .'/?redirect=0');
    }

    // Determine whether the user has permission to download course content.
    $candownloadcourse = \core\content::can_export_context($context, $USER);

    // We are currently keeping the button here from 1.x to help new teachers figure out
    // what to do, even though the link also appears in the course admin block.  It also

<     // means you can back out of a situation where you removed the admin block. :)



> // means you can back out of a situation where you removed the admin block.


    if ($PAGE->user_allowed_editing()) {
        $buttons = $OUTPUT->edit_button($PAGE->url);
        $PAGE->set_button($buttons);
    }

    $editingtitle = '';
    if ($PAGE->user_is_editing()) {
        // Append this to the page title's lang string to get its equivalent when editing mode is turned on.
        $editingtitle = 'editing';
    }


<     // If viewing a section, make the title more specific
<     if ($section and $section > 0 and course_format_uses_sections($course->format)) {



> // If viewing a section, make the title more specific.
> if ($section && $section > 0 && course_format_uses_sections($course->format)) {


        $sectionname = get_string('sectionname', "format_$course->format");
        $sectiontitle = get_section_name($course, $section);

<         $PAGE->set_title(get_string('coursesectiontitle' . $editingtitle, 'moodle', array(
<             'course' => $course->fullname, 'sectiontitle' => $sectiontitle, 'sectionname' => $sectionname)
<         ));



>     $PAGE->set_title(
>         get_string(
>             'coursesectiontitle' . $editingtitle,
>             'moodle',
>             ['course' => $course->fullname, 'sectiontitle' => $sectiontitle, 'sectionname' => $sectionname]
>         )
>     );


    } else {

<         $PAGE->set_title(get_string('coursetitle' . $editingtitle, 'moodle', array('course' => $course->fullname)));



>     $PAGE->set_title(get_string('coursetitle' . $editingtitle, 'moodle', ['course' => $course->fullname]));
> }
> 
> // Add bulk editing control.
> $bulkbutton = $renderer->bulk_editing_button($format);
> if (!empty($bulkbutton)) {
>     $PAGE->add_header_action($bulkbutton);


    }

    $PAGE->set_heading($course->fullname);
    echo $OUTPUT->header();

    if ($USER->editing == 1) {

        // MDL-65321 The backup libraries are quite heavy, only require the bare minimum.
        require_once($CFG->dirroot . '/backup/util/helper/async_helper.class.php');

        if (async_helper::is_async_pending($id, 'course', 'backup')) {
            echo $OUTPUT->notification(get_string('pendingasyncedit', 'backup'), 'warning');
        }
    }

    // Course wrapper start.

<     echo html_writer::start_tag('div', array('class'=>'course-content'));



> echo html_writer::start_tag('div', ['class' => 'course-content']);




<     // make sure that section 0 exists (this function will create one if it is missing)



> // Make sure that section 0 exists (this function will create one if it is missing).


    course_create_sections_if_missing($course, 0);


<     // get information about course modules and existing module types
<     // format.php in course formats may rely on presence of these variables



> // Get information about course modules and existing module types.
> // format.php in course formats may rely on presence of these variables.


    $modinfo = get_fast_modinfo($course);
    $modnames = get_module_types_names();
    $modnamesplural = get_module_types_names(true);
    $modnamesused = $modinfo->get_used_module_names();
    $mods = $modinfo->get_cms();
    $sections = $modinfo->get_section_info_all();

    // CAUTION, hacky fundamental variable defintion to follow!
    // Note that because of the way course fromats are constructed though

<     // inclusion we pass parameters around this way..



> // inclusion we pass parameters around this way.


    $displaysection = $section;


<     // Include course AJAX



> // Include course AJAX.


    include_course_ajax($course, $modnamesused);

    // Include the actual course format.
    require($CFG->dirroot .'/course/format/'. $course->format .'/format.php');
    // Content wrapper end.

    echo html_writer::end_tag('div');

    // Trigger course viewed event.
    // We don't trust $context here. Course format inclusion above executes in the global space. We can't assume
    // anything after that point.
    course_view(context_course::instance($course->id), $section);

    // If available, include the JS to prepare the download course content modal.
    if ($candownloadcourse) {
        $PAGE->requires->js_call_amd('core_course/downloadcontent', 'init');
    }

    // Load the view JS module if completion tracking is enabled for this course.
    $completion = new completion_info($course);
    if ($completion->is_enabled()) {
        $PAGE->requires->js_call_amd('core_course/view', 'init');
    }

    echo $OUTPUT->footer();