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<?php
2
// This file is part of Moodle - http://moodle.org/
3
//
4
// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
8
//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
11
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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// GNU General Public License for more details.
13
//
14
// You should have received a copy of the GNU General Public License
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// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
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17
/**
18
 * Contains the base definition class for any course format plugin.
19
 *
20
 * @package   core_courseformat
21
 * @copyright 2020 Ferran Recio <ferran@moodle.com>
22
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
23
 */
24
 
25
namespace core_courseformat;
26
 
27
use navigation_node;
28
use moodle_page;
29
use cm_info;
30
use core_component;
31
use course_modinfo;
32
use html_writer;
33
use section_info;
34
use context_course;
35
use editsection_form;
36
use moodle_exception;
37
use coding_exception;
38
use moodle_url;
39
use lang_string;
40
use core_external\external_api;
41
use stdClass;
42
use cache;
43
use core_courseformat\output\legacy_renderer;
44
 
45
/**
46
 * Base class for course formats
47
 *
48
 * Each course format must declare class
49
 * class format_FORMATNAME extends core_courseformat\base {}
50
 * in file lib.php
51
 *
52
 * For each course just one instance of this class is created and it will always be returned by
53
 * course_get_format($courseorid). Format may store it's specific course-dependent options in
54
 * variables of this class.
55
 *
56
 * In rare cases instance of child class may be created just for format without course id
57
 * i.e. to check if format supports AJAX.
58
 *
59
 * Also course formats may extend class section_info and overwrite
60
 * course_format::build_section_cache() to return more information about sections.
61
 *
62
 * If you are upgrading from Moodle 2.3 start with copying the class format_legacy and renaming
63
 * it to format_FORMATNAME, then move the code from your callback functions into
64
 * appropriate functions of the class.
65
 *
66
 * @package    core_courseformat
67
 * @copyright  2012 Marina Glancy
68
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
69
 */
70
abstract class base {
71
    /** @var int Id of the course in this instance (maybe 0) */
72
    protected $courseid;
73
    /** @var string format used for this course. Please note that it can be different from
74
     * course.format field if course referes to non-existing of disabled format */
75
    protected $format;
76
    /** @var stdClass course data for course object, please use course_format::get_course() */
77
    protected $course = false;
78
    /** @var array caches format options, please use course_format::get_format_options() */
79
    protected $formatoptions = array();
80
    /** @var int|null the section number in single section format, null for multiple section formats. */
81
    protected $singlesection = null;
82
    /** @var int|null the sectionid when a single section is selected, null when multiple sections are displayed. */
83
    protected $singlesectionid = null;
84
    /** @var course_modinfo the current course modinfo, please use course_format::get_modinfo() */
85
    private $modinfo = null;
86
    /** @var array cached instances */
87
    private static $instances = array();
88
    /** @var array plugin name => class name. */
89
    private static $classesforformat = array('site' => 'site');
90
    /** @var sectionmanager the format section manager. */
91
    protected $sectionmanager = null;
92
 
93
    /**
94
     * Creates a new instance of class
95
     *
96
     * Please use course_get_format($courseorid) to get an instance of the format class
97
     *
98
     * @param string $format
99
     * @param int $courseid
100
     */
101
    protected function __construct($format, $courseid) {
102
        $this->format = $format;
103
        $this->courseid = $courseid;
104
    }
105
 
106
    /**
107
     * Validates that course format exists and enabled and returns either itself or default format
108
     *
109
     * @param string $format
110
     * @return string
111
     */
112
    final protected static function get_format_or_default($format) {
113
        global $CFG;
114
        require_once($CFG->dirroot . '/course/lib.php');
115
 
116
        if (array_key_exists($format, self::$classesforformat)) {
117
            return self::$classesforformat[$format];
118
        }
119
 
120
        $plugins = get_sorted_course_formats();
121
        foreach ($plugins as $plugin) {
122
            self::$classesforformat[$plugin] = $plugin;
123
        }
124
 
125
        if (array_key_exists($format, self::$classesforformat)) {
126
            return self::$classesforformat[$format];
127
        }
128
 
129
        if (PHPUNIT_TEST && class_exists('format_' . $format)) {
130
            // Allow unittests to use non-existing course formats.
131
            return $format;
132
        }
133
 
134
        // Else return default format.
135
        $defaultformat = get_config('moodlecourse', 'format');
136
        if (!in_array($defaultformat, $plugins)) {
137
            // When default format is not set correctly, use the first available format.
138
            $defaultformat = reset($plugins);
139
        }
140
        debugging('Format plugin format_'.$format.' is not found. Using default format_'.$defaultformat, DEBUG_DEVELOPER);
141
 
142
        self::$classesforformat[$format] = $defaultformat;
143
        return $defaultformat;
144
    }
145
 
146
    /**
147
     * Get class name for the format.
148
     *
149
     * If course format xxx does not declare class format_xxx, format_legacy will be returned.
150
     * This function also includes lib.php file from corresponding format plugin
151
     *
152
     * @param string $format
153
     * @return string
154
     */
155
    final protected static function get_class_name($format) {
156
        global $CFG;
157
        static $classnames = array('site' => 'format_site');
158
        if (!isset($classnames[$format])) {
159
            $plugins = core_component::get_plugin_list('format');
160
            $usedformat = self::get_format_or_default($format);
161
            if (isset($plugins[$usedformat]) && file_exists($plugins[$usedformat].'/lib.php')) {
162
                require_once($plugins[$usedformat].'/lib.php');
163
            }
164
            $classnames[$format] = 'format_'. $usedformat;
165
            if (!class_exists($classnames[$format])) {
166
                require_once($CFG->dirroot.'/course/format/formatlegacy.php');
167
                $classnames[$format] = 'format_legacy';
168
            }
169
        }
170
        return $classnames[$format];
171
    }
172
 
173
    /**
174
     * Returns an instance of the class
175
     *
176
     * @todo MDL-35727 use MUC for caching of instances, limit the number of cached instances
177
     *
178
     * @param int|stdClass $courseorid either course id or
179
     *     an object that has the property 'format' and may contain property 'id'
180
     * @return base
181
     */
182
    final public static function instance($courseorid) {
183
        global $DB;
184
        if (!is_object($courseorid)) {
185
            $courseid = (int)$courseorid;
186
            if ($courseid && isset(self::$instances[$courseid]) && count(self::$instances[$courseid]) == 1) {
187
                $formats = array_keys(self::$instances[$courseid]);
188
                $format = reset($formats);
189
            } else {
190
                $format = $DB->get_field('course', 'format', array('id' => $courseid), MUST_EXIST);
191
            }
192
        } else {
193
            $format = $courseorid->format;
194
            if (isset($courseorid->id)) {
195
                $courseid = clean_param($courseorid->id, PARAM_INT);
196
            } else {
197
                $courseid = 0;
198
            }
199
        }
200
        // Validate that format exists and enabled, use default otherwise.
201
        $format = self::get_format_or_default($format);
202
        if (!isset(self::$instances[$courseid][$format])) {
203
            $classname = self::get_class_name($format);
204
            self::$instances[$courseid][$format] = new $classname($format, $courseid);
205
        }
206
        return self::$instances[$courseid][$format];
207
    }
208
 
209
    /**
210
     * Resets cache for the course (or all caches)
211
     *
212
     * To be called from rebuild_course_cache()
213
     *
214
     * @param int $courseid
215
     */
216
    final public static function reset_course_cache($courseid = 0) {
217
        if ($courseid) {
218
            if (isset(self::$instances[$courseid])) {
219
                foreach (self::$instances[$courseid] as $format => $object) {
220
                    // In case somebody keeps the reference to course format object.
221
                    self::$instances[$courseid][$format]->course = false;
222
                    self::$instances[$courseid][$format]->formatoptions = array();
223
                    self::$instances[$courseid][$format]->modinfo = null;
224
                }
225
                unset(self::$instances[$courseid]);
226
            }
227
        } else {
228
            self::$instances = array();
229
        }
230
    }
231
    /**
232
     * Reset the current user for all courses.
233
     *
234
     * The course format cache resets every time the course cache resets but
235
     * also when the user changes their language, all course editors
236
     *
237
     * @return void
238
     */
239
    public static function session_cache_reset_all(): void {
240
        $statecache = cache::make('core', 'courseeditorstate');
241
        $statecache->purge();
242
    }
243
 
244
    /**
245
     * Reset the current user course format cache.
246
     *
247
     * The course format cache resets every time the course cache resets but
248
     * also when the user changes their course format preference, complete
249
     * an activity...
250
     *
251
     * @param stdClass $course the course object
252
     * @return string the new statekey
253
     */
254
    public static function session_cache_reset(stdClass $course): string {
255
        $statecache = cache::make('core', 'courseeditorstate');
256
        $newkey = $course->cacherev . '_' . time();
257
        $statecache->set($course->id, $newkey);
258
        return $newkey;
259
    }
260
 
261
    /**
262
     * Return the current user course format cache key.
263
     *
264
     * The course format session cache can be used to cache the
265
     * user course representation. The statekey will be reset when the
266
     * the course state changes. For example when the course is edited,
267
     * the user completes an activity or simply some course preference
268
     * like collapsing a section happens.
269
     *
270
     * @param stdClass $course the course object
271
     * @return string the current statekey
272
     */
273
    public static function session_cache(stdClass $course): string {
274
        $statecache = cache::make('core', 'courseeditorstate');
275
        $statekey = $statecache->get($course->id);
276
        // Validate the statekey code.
277
        if (preg_match('/^[0-9]+_[0-9]+$/', $statekey)) {
278
            list($cacherev) = explode('_', $statekey);
279
            if ($cacherev == $course->cacherev) {
280
                return $statekey;
281
            }
282
        }
283
        return self::session_cache_reset($course);
284
    }
285
 
286
    /**
287
     * Returns the format name used by this course
288
     *
289
     * @return string
290
     */
291
    final public function get_format() {
292
        return $this->format;
293
    }
294
 
295
    /**
296
     * Returns id of the course (0 if course is not specified)
297
     *
298
     * @return int
299
     */
300
    final public function get_courseid() {
301
        return $this->courseid;
302
    }
303
 
304
    /**
305
     * Returns the course context.
306
     *
307
     * @return context_course the course context
308
     */
309
    final public function get_context(): context_course {
310
        return context_course::instance($this->courseid);
311
    }
312
 
313
    /**
314
     * Returns a record from course database table plus additional fields
315
     * that course format defines
316
     *
317
     * @return ?stdClass
318
     */
319
    public function get_course() {
320
        global $DB;
321
        if (!$this->courseid) {
322
            return null;
323
        }
324
        if ($this->course === false) {
325
            $this->course = get_course($this->courseid);
326
            $options = $this->get_format_options();
327
            $dbcoursecolumns = null;
328
            foreach ($options as $optionname => $optionvalue) {
329
                if (isset($this->course->$optionname)) {
330
                    // Course format options must not have the same names as existing columns in db table "course".
331
                    if (!isset($dbcoursecolumns)) {
332
                        $dbcoursecolumns = $DB->get_columns('course');
333
                    }
334
                    if (isset($dbcoursecolumns[$optionname])) {
335
                        debugging('The option name '.$optionname.' in course format '.$this->format.
336
                            ' is invalid because the field with the same name exists in {course} table',
337
                            DEBUG_DEVELOPER);
338
                        continue;
339
                    }
340
                }
341
                $this->course->$optionname = $optionvalue;
342
            }
343
        }
344
        return $this->course;
345
    }
346
 
347
    /**
348
     * Get the course display value for the current course.
349
     *
350
     * Formats extending topics or weeks will use coursedisplay as this setting name
351
     * so they don't need to override the method. However, if the format uses a different
352
     * display logic it must override this method to ensure the core renderers know
353
     * if a COURSE_DISPLAY_MULTIPAGE or COURSE_DISPLAY_SINGLEPAGE is being used.
354
     *
355
     * @return int The current value (COURSE_DISPLAY_MULTIPAGE or COURSE_DISPLAY_SINGLEPAGE)
356
     */
357
    public function get_course_display(): int {
358
        return $this->get_course()->coursedisplay ?? COURSE_DISPLAY_SINGLEPAGE;
359
    }
360
 
361
    /**
362
     * Return the current course modinfo.
363
     *
364
     * This method is used mainly by the output components to avoid unnecesary get_fast_modinfo calls.
365
     *
366
     * @return course_modinfo
367
     */
368
    public function get_modinfo(): course_modinfo {
369
        global $USER;
370
        if ($this->modinfo === null) {
371
            $this->modinfo = course_modinfo::instance($this->courseid, $USER->id);
372
        }
373
        return $this->modinfo;
374
    }
375
 
376
    /**
377
     * Method used in the rendered and during backup instead of legacy 'numsections'
378
     *
379
     * Default renderer will treat sections with sectionnumber greater that the value returned by this
380
     * method as "orphaned" and not display them on the course page unless in editing mode.
381
     * Backup will store this value as 'numsections'.
382
     *
383
     * This method ensures that 3rd party course format plugins that still use 'numsections' continue to
384
     * work but at the same time we no longer expect formats to have 'numsections' property.
385
     *
386
     * @return int The last section number, or -1 if sections are entirely missing
387
     */
388
    public function get_last_section_number() {
389
        $course = $this->get_course();
390
        if (isset($course->numsections)) {
391
            return $course->numsections;
392
        }
393
        $modinfo = get_fast_modinfo($course);
394
        $sections = $modinfo->get_section_info_all();
395
 
396
        // Sections seem to be missing entirely. Avoid subsequent errors and return early.
397
        if (count($sections) === 0) {
398
            return -1;
399
        }
400
 
401
        return (int)max(array_keys($sections));
402
    }
403
 
404
    /**
405
     * Method used to get the maximum number of sections for this course format.
406
     * @return int
407
     */
408
    public function get_max_sections() {
409
        $maxsections = get_config('moodlecourse', 'maxsections');
410
        if (!isset($maxsections) || !is_numeric($maxsections)) {
411
            $maxsections = 52;
412
        }
413
        return $maxsections;
414
    }
415
 
416
    /**
417
     * Returns true if the course has a front page.
418
     *
419
     * This function is called to determine if the course has a view page, whether or not
420
     * it contains a listing of activities. It can be useful to set this to false when the course
421
     * format has only one activity and ignores the course page. Or if there are multiple
422
     * activities but no page to see the centralised information.
423
     *
424
     * Initially this was created to know if forms should add a button to return to the course page.
425
     * So if 'Return to course' does not make sense in your format your should probably return false.
426
     *
427
     * @return boolean
428
     * @since Moodle 2.6
429
     */
430
    public function has_view_page() {
431
        return true;
432
    }
433
 
434
    /**
435
     * Generate the title for this section page.
436
     *
437
     * @return string the page title
438
     */
439
    public function page_title(): string {
440
        global $PAGE;
441
        return $PAGE->title;
442
    }
443
 
444
    /**
445
     * Returns true if this course format uses sections
446
     *
447
     * This function may be called without specifying the course id
448
     * i.e. in course_format_uses_sections()
449
     *
450
     * Developers, note that if course format does use sections there should be defined a language
451
     * string with the name 'sectionname' defining what the section relates to in the format, i.e.
452
     * $string['sectionname'] = 'Topic';
453
     * or
454
     * $string['sectionname'] = 'Week';
455
     *
456
     * @return bool
457
     */
458
    public function uses_sections() {
459
        return false;
460
    }
461
 
462
    /**
463
     * Returns true if this course format uses course index
464
     *
465
     * This function may be called without specifying the course id
466
     * i.e. in course_index_drawer()
467
     *
468
     * @return bool
469
     */
470
    public function uses_course_index() {
471
        return false;
472
    }
473
 
474
    /**
475
     * Returns true if this course format uses activity indentation.
476
     *
477
     * @return bool if the course format uses indentation.
478
     */
479
    public function uses_indentation(): bool {
480
        return true;
481
    }
482
 
483
    /**
484
     * Returns a list of sections used in the course
485
     *
486
     * This is a shortcut to get_fast_modinfo()->get_section_info_all()
487
     * @see get_fast_modinfo()
488
     * @see course_modinfo::get_section_info_all()
489
     *
490
     * @return array of section_info objects
491
     */
492
    final public function get_sections() {
493
        if ($course = $this->get_course()) {
494
            $modinfo = get_fast_modinfo($course);
495
            return $modinfo->get_section_info_all();
496
        }
497
        return array();
498
    }
499
 
500
    /**
501
     * Returns information about section used in course
502
     *
503
     * @param int|stdClass $section either section number (field course_section.section) or row from course_section table
504
     * @param int $strictness
505
     * @return ?section_info
506
     */
507
    final public function get_section($section, $strictness = IGNORE_MISSING) {
508
        if (is_object($section)) {
509
            $sectionnum = $section->section;
510
        } else {
511
            $sectionnum = $section;
512
        }
513
        $sections = $this->get_sections();
514
        if (array_key_exists($sectionnum, $sections)) {
515
            return $sections[$sectionnum];
516
        }
517
        if ($strictness == MUST_EXIST) {
518
            throw new moodle_exception('sectionnotexist');
519
        }
520
        return null;
521
    }
522
 
523
    /**
524
     * Returns the display name of the given section that the course prefers.
525
     *
526
     * @param int|stdClass|section_info $section Section object from database or just field course_sections.section
527
     * @return string Display name that the course format prefers, e.g. "Topic 2"
528
     */
529
    public function get_section_name($section) {
530
        if (is_object($section)) {
531
            $sectionnum = $section->section;
532
        } else {
533
            $sectionnum = $section;
534
        }
535
 
536
        if (get_string_manager()->string_exists('sectionname', 'format_' . $this->format)) {
537
            return get_string('sectionname', 'format_' . $this->format) . ' ' . $sectionnum;
538
        }
539
 
540
        // Return an empty string if there's no available section name string for the given format.
541
        return '';
542
    }
543
 
544
    /**
545
     * Returns the default section using course_format's implementation of get_section_name.
546
     *
547
     * @param int|stdClass $section Section object from database or just field course_sections section
548
     * @return string The default value for the section name based on the given course format.
549
     */
550
    public function get_default_section_name($section) {
551
        return self::get_section_name($section);
552
    }
553
 
554
    /**
555
     * Returns the name for the highlighted section.
556
     *
557
     * @return string The name for the highlighted section based on the given course format.
558
     */
559
    public function get_section_highlighted_name(): string {
560
        return get_string('highlighted');
561
    }
562
 
563
    /**
564
     * Set if the current format instance will show multiple sections or an individual one.
565
     *
566
     * Some formats has the hability to swith from one section to multiple sections per page.
567
     *
568
     * @param int|null $sectionid null for all sections or a sectionid.
569
     */
570
    public function set_sectionid(?int $sectionid): void {
571
        if ($sectionid === null) {
572
            $this->singlesection = null;
573
            $this->singlesectionid = null;
574
            return;
575
        }
576
 
577
        $modinfo = get_fast_modinfo($this->courseid);
578
        $sectioninfo = $modinfo->get_section_info_by_id($sectionid);
579
        if ($sectioninfo === null) {
580
            throw new coding_exception('Invalid sectionid: '. $sectionid);
581
        }
582
 
583
        $this->singlesection = $sectioninfo->section;
584
        $this->singlesectionid = $sectionid;
585
    }
586
 
587
    /**
588
     * Get if the current format instance will show multiple sections or an individual one.
589
     *
590
     * Some formats has the hability to swith from one section to multiple sections per page,
591
     * output components will use this method to know if the current display is a single or
592
     * multiple sections.
593
     *
594
     * @return int|null null for all sections or the sectionid.
595
     */
596
    public function get_sectionid(): ?int {
597
        return $this->singlesectionid;
598
    }
599
 
600
    /**
601
     * Set if the current format instance will show multiple sections or an individual one.
602
     *
603
     * Some formats has the hability to swith from one section to multiple sections per page.
604
     *
605
     * @param int $singlesection zero for all sections or a section number
606
     * @deprecated Since 4.4. Use set_sectionnum instead.
607
     * @todo MDL-80116 This will be deleted in Moodle 4.8.
608
     */
609
    public function set_section_number(int $singlesection): void {
610
 
611
        debugging(
612
            'The method core_courseformat\base::set_section_number() has been deprecated, please use set_sectionnum() instead.',
613
            DEBUG_DEVELOPER
614
        );
615
 
616
        if ($singlesection === 0) {
617
            // Convert zero to null, to guarantee all the sections are displayed.
618
            $singlesection = null;
619
        }
620
        $this->set_sectionnum($singlesection);
621
    }
622
 
623
    /**
624
     * Set the current section number to display.
625
     * Some formats has the hability to swith from one section to multiple sections per page.
626
     *
627
     * @since Moodle 4.4
628
     * @param int|null $sectionnum null for all sections or a sectionid.
629
     */
630
    public function set_sectionnum(?int $sectionnum): void {
631
        if ($sectionnum === null) {
632
            $this->singlesection = null;
633
            $this->singlesectionid = null;
634
            return;
635
        }
636
 
637
        $modinfo = get_fast_modinfo($this->courseid);
638
        $sectioninfo = $modinfo->get_section_info($sectionnum);
639
        if ($sectioninfo === null) {
640
            throw new coding_exception('Invalid sectionnum: '. $sectionnum);
641
        }
642
 
643
        $this->singlesection = $sectionnum;
644
        $this->singlesectionid = $sectioninfo->id;
645
    }
646
 
647
    /**
648
     * Get the current section number to display.
649
     * Some formats has the hability to swith from one section to multiple sections per page.
650
     *
651
     * @since Moodle 4.4
652
     * @return int|null the current section number or null when there is no single section.
653
     */
654
    public function get_sectionnum(): ?int {
655
        return $this->singlesection;
656
    }
657
 
658
    /**
659
     * Set if the current format instance will show multiple sections or an individual one.
660
     *
661
     * Some formats has the hability to swith from one section to multiple sections per page,
662
     * output components will use this method to know if the current display is a single or
663
     * multiple sections.
664
     *
665
     * @return int zero for all sections or the sectin number
666
     * @deprecated Since 4.4. Use get_sectionnum instead.
667
     * @todo MDL-80116 This will be deleted in Moodle 4.8.
668
     */
669
    public function get_section_number(): int {
670
 
671
        debugging(
672
            'The method core_courseformat\base::get_section_number() has been deprecated, please use get_sectionnum() instead.',
673
            DEBUG_DEVELOPER
674
        );
675
 
676
        if ($this->singlesection === null) {
677
            // Convert null to zero, to guarantee all the sections are displayed.
678
            return 0;
679
        }
680
 
681
        return $this->singlesection;
682
    }
683
 
684
    /**
685
     * Return the format section preferences.
686
     *
687
     * @return array of preferences indexed by sectionid
688
     */
689
    public function get_sections_preferences(): array {
690
        global $USER;
691
 
692
        $result = [];
693
 
694
        $course = $this->get_course();
695
        $coursesectionscache = cache::make('core', 'coursesectionspreferences');
696
 
697
        $coursesections = $coursesectionscache->get($course->id);
698
        if ($coursesections) {
699
            return $coursesections;
700
        }
701
 
702
        $sectionpreferences = $this->get_sections_preferences_by_preference();
703
 
704
        foreach ($sectionpreferences as $preference => $sectionids) {
705
            if (!empty($sectionids) && is_array($sectionids)) {
706
                foreach ($sectionids as $sectionid) {
707
                    if (!isset($result[$sectionid])) {
708
                        $result[$sectionid] = new stdClass();
709
                    }
710
                    $result[$sectionid]->$preference = true;
711
                }
712
            }
713
        }
714
 
715
        $coursesectionscache->set($course->id, $result);
716
        return $result;
717
    }
718
 
719
    /**
720
     * Return the format section preferences.
721
     *
722
     * @return array of preferences indexed by preference name
723
     */
724
    public function get_sections_preferences_by_preference(): array {
725
        global $USER;
726
        $course = $this->get_course();
727
        try {
728
            $sectionpreferences = json_decode(
729
                get_user_preferences("coursesectionspreferences_{$course->id}", '', $USER->id),
730
                true,
731
            );
732
            if (empty($sectionpreferences)) {
733
                $sectionpreferences = [];
734
            }
735
        } catch (\Throwable $e) {
736
            $sectionpreferences = [];
737
        }
738
        return $sectionpreferences;
739
    }
740
 
741
    /**
742
     * Return the format section preferences.
743
     *
744
     * @param string $preferencename preference name
745
     * @param int[] $sectionids affected section ids
746
     *
747
     */
748
    public function set_sections_preference(string $preferencename, array $sectionids) {
749
        $sectionpreferences = $this->get_sections_preferences_by_preference();
750
        $sectionpreferences[$preferencename] = $sectionids;
751
        $this->persist_to_user_preference($sectionpreferences);
752
    }
753
 
754
    /**
755
     * Add section preference ids.
756
     *
757
     * @param string $preferencename preference name
758
     * @param array $sectionids affected section ids
759
     */
760
    public function add_section_preference_ids(
761
        string $preferencename,
762
        array $sectionids,
763
    ): void {
764
        $sectionpreferences = $this->get_sections_preferences_by_preference();
765
        if (!isset($sectionpreferences[$preferencename])) {
766
            $sectionpreferences[$preferencename] = [];
767
        }
768
        foreach ($sectionids as $sectionid) {
769
            if (!in_array($sectionid, $sectionpreferences[$preferencename])) {
770
                $sectionpreferences[$preferencename][] = $sectionid;
771
            }
772
        }
773
        $this->persist_to_user_preference($sectionpreferences);
774
    }
775
 
776
    /**
777
     * Remove section preference ids.
778
     *
779
     * @param string $preferencename preference name
780
     * @param array $sectionids affected section ids
781
     */
782
    public function remove_section_preference_ids(
783
        string $preferencename,
784
        array $sectionids,
785
    ): void {
786
        $sectionpreferences = $this->get_sections_preferences_by_preference();
787
        if (!isset($sectionpreferences[$preferencename])) {
788
            $sectionpreferences[$preferencename] = [];
789
        }
790
        foreach ($sectionids as $sectionid) {
791
            if (($key = array_search($sectionid, $sectionpreferences[$preferencename])) !== false) {
792
                unset($sectionpreferences[$preferencename][$key]);
793
            }
794
        }
795
        $this->persist_to_user_preference($sectionpreferences);
796
    }
797
 
798
    /**
799
     * Persist the section preferences to the user preferences.
800
     *
801
     * @param array $sectionpreferences the section preferences
802
     */
803
    private function persist_to_user_preference(
804
        array $sectionpreferences,
805
    ): void {
806
        global $USER;
807
        $course = $this->get_course();
808
        set_user_preference('coursesectionspreferences_' . $course->id, json_encode($sectionpreferences), $USER->id);
809
        // Invalidate section preferences cache.
810
        $coursesectionscache = cache::make('core', 'coursesectionspreferences');
811
        $coursesectionscache->delete($course->id);
812
    }
813
 
814
    /**
815
     * Returns the information about the ajax support in the given source format
816
     *
817
     * The returned object's property (boolean)capable indicates that
818
     * the course format supports Moodle course ajax features.
819
     *
820
     * @return stdClass
821
     */
822
    public function supports_ajax() {
823
        // No support by default.
824
        $ajaxsupport = new stdClass();
825
        $ajaxsupport->capable = false;
826
        return $ajaxsupport;
827
    }
828
 
829
    /**
830
     * Returns true if this course format is compatible with content components.
831
     *
832
     * Using components means the content elements can watch the frontend course state and
833
     * react to the changes. Formats with component compatibility can have more interactions
834
     * without refreshing the page, like having drag and drop from the course index to reorder
835
     * sections and activities.
836
     *
837
     * @return bool if the format is compatible with components.
838
     */
839
    public function supports_components() {
840
        return false;
841
    }
842
 
843
 
844
    /**
845
     * Custom action after section has been moved in AJAX mode
846
     *
847
     * Used in course/rest.php
848
     *
849
     * @return ?array This will be passed in ajax respose
850
     */
851
    public function ajax_section_move() {
852
        return null;
853
    }
854
 
855
    /**
856
     * The URL to use for the specified course (with section)
857
     *
858
     * Please note that course view page /course/view.php?id=COURSEID is hardcoded in many
859
     * places in core and contributed modules. If course format wants to change the location
860
     * of the view script, it is not enough to change just this function. Do not forget
861
     * to add proper redirection.
862
     *
863
     * @param int|stdClass $section Section object from database or just field course_sections.section
864
     *     if null the course view page is returned
865
     * @param array $options options for view URL. At the moment core uses:
866
     *     'navigation' (bool) if true and section not empty, the function returns section page; otherwise, it returns course page.
867
     *     'sr' (int) used by course formats to specify to which section to return
868
     *     'expanded' (bool) if true the section will be shown expanded, true by default
869
     * @return null|moodle_url
870
     */
871
    public function get_view_url($section, $options = array()) {
872
        $course = $this->get_course();
873
        $url = new moodle_url('/course/view.php', ['id' => $course->id]);
874
 
875
        if (array_key_exists('sr', $options)) {
876
            $sectionno = $options['sr'];
877
        } else if (is_object($section)) {
878
            $sectionno = $section->section;
879
        } else {
880
            $sectionno = $section;
881
        }
882
        if ((!empty($options['navigation']) || array_key_exists('sr', $options)) && $sectionno !== null) {
883
            // Display section on separate page.
884
            $sectioninfo = $this->get_section($sectionno);
885
            return new moodle_url('/course/section.php', ['id' => $sectioninfo->id]);
886
        }
887
        if ($this->uses_sections() && $sectionno !== null) {
888
            // The url includes the parameter to expand the section by default.
889
            if (!array_key_exists('expanded', $options)) {
890
                $options['expanded'] = true;
891
            }
892
            if ($options['expanded']) {
893
                // This parameter is being set by default.
894
                $url->param('expandsection', $sectionno);
895
            }
896
            $url->set_anchor('section-'.$sectionno);
897
        }
898
 
899
        return $url;
900
    }
901
 
902
    /**
903
     * Return the old non-ajax activity action url.
904
     *
905
     * BrowserKit behats tests cannot trigger javascript events,
906
     * so we must translate to an old non-ajax url while non-ajax
907
     * course editing is still supported.
908
     *
909
     * @param string $action action name the reactive action
910
     * @param cm_info $cm course module
911
     * @return moodle_url
912
     */
913
    public function get_non_ajax_cm_action_url(string $action, cm_info $cm): moodle_url {
914
        $nonajaxactions = [
915
            'cmDelete' => 'delete',
916
            'cmDuplicate' => 'duplicate',
917
            'cmHide' => 'hide',
918
            'cmShow' => 'show',
919
            'cmStealth' => 'stealth',
920
        ];
921
        if (!isset($nonajaxactions[$action])) {
922
            throw new coding_exception('Unknown activity action: ' . $action);
923
        }
924
        $nonajaxaction = $nonajaxactions[$action];
925
        $nonajaxurl = new moodle_url(
926
            '/course/mod.php',
927
            ['sesskey' => sesskey(), $nonajaxaction => $cm->id]
928
        );
929
        if (!is_null($this->get_sectionid())) {
930
            $nonajaxurl->param('sr', $this->get_sectionnum());
931
        }
932
        return $nonajaxurl;
933
    }
934
 
935
    /**
936
     * Loads all of the course sections into the navigation
937
     *
938
     * This method is called from global_navigation::load_course_sections()
939
     *
940
     * By default the method global_navigation::load_generic_course_sections() is called
941
     *
942
     * When overwriting please note that navigationlib relies on using the correct values for
943
     * arguments $type and $key in navigation_node::add()
944
     *
945
     * Example of code creating a section node:
946
     * $sectionnode = $node->add($sectionname, $url, navigation_node::TYPE_SECTION, null, $section->id);
947
     * $sectionnode->nodetype = navigation_node::NODETYPE_BRANCH;
948
     *
949
     * Example of code creating an activity node:
950
     * $activitynode = $sectionnode->add($activityname, $action, navigation_node::TYPE_ACTIVITY, null, $activity->id, $icon);
951
     * if (global_navigation::module_extends_navigation($activity->modname)) {
952
     *     $activitynode->nodetype = navigation_node::NODETYPE_BRANCH;
953
     * } else {
954
     *     $activitynode->nodetype = navigation_node::NODETYPE_LEAF;
955
     * }
956
     *
957
     * Also note that if $navigation->includesectionnum is not null, the section with this relative
958
     * number needs is expected to be loaded
959
     *
960
     * @param \global_navigation $navigation
961
     * @param navigation_node $node The course node within the navigation
962
     */
963
    public function extend_course_navigation($navigation, navigation_node $node) {
964
        if ($course = $this->get_course()) {
965
            $navigation->load_generic_course_sections($course, $node);
966
        }
967
        return array();
968
    }
969
 
970
    /**
971
     * Returns the list of blocks to be automatically added for the newly created course
972
     *
973
     * @see blocks_add_default_course_blocks()
974
     *
975
     * @return array of default blocks, must contain two keys BLOCK_POS_LEFT and BLOCK_POS_RIGHT
976
     *     each of values is an array of block names (for left and right side columns)
977
     */
978
    public function get_default_blocks() {
979
        global $CFG;
980
        if (isset($CFG->defaultblocks)) {
981
            return blocks_parse_default_blocks_list($CFG->defaultblocks);
982
        }
983
        $blocknames = array(
984
            BLOCK_POS_LEFT => array(),
985
            BLOCK_POS_RIGHT => array()
986
        );
987
        return $blocknames;
988
    }
989
 
990
    /**
991
     * Return custom strings for the course editor.
992
     *
993
     * This method is mainly used to translate the "section" related strings into
994
     * the specific format plugins name such as "Topics" or "Weeks".
995
     *
996
     * @return stdClass[] an array of objects with string "component" and "key"
997
     */
998
    public function get_editor_custom_strings(): array {
999
        $result = [];
1000
        $stringmanager = get_string_manager();
1001
        $component = 'format_' . $this->format;
1002
        $formatoverridbles = [
1003
            'sectionavailability_title',
1004
            'sectiondelete_title',
1005
            'sectiondelete_info',
1006
            'sectionsdelete_title',
1007
            'sectionsdelete_info',
1008
            'sectionmove_title',
1009
            'sectionmove_info',
1010
            'sectionsavailability_title',
1011
            'sectionsmove_title',
1012
            'sectionsmove_info',
1013
            'selectsection'
1014
        ];
1015
        foreach ($formatoverridbles as $key) {
1016
            if ($stringmanager->string_exists($key, $component)) {
1017
                $result[] = (object)['component' => $component, 'key' => $key];
1018
            }
1019
        }
1020
        return $result;
1021
    }
1022
 
1023
    /**
1024
     * Get the proper format plugin string if it exists.
1025
     *
1026
     * If the format_PLUGINNAME does not provide a valid string,
1027
     * core_courseformat will be user as the component.
1028
     *
1029
     * @param string $key the string key
1030
     * @param string|object|array|int $data extra data that can be used within translation strings
1031
     * @return string the get_string result
1032
     */
1033
    public function get_format_string(string $key, $data = null): string {
1034
        $component = 'format_' . $this->get_format();
1035
        if (!get_string_manager()->string_exists($key, $component)) {
1036
            $component = 'core_courseformat';
1037
        }
1038
        return get_string($key, $component, $data);
1039
    }
1040
 
1041
    /**
1042
     * Returns the localised name of this course format plugin
1043
     *
1044
     * @return lang_string
1045
     */
1046
    final public function get_format_name() {
1047
        return new lang_string('pluginname', 'format_'.$this->get_format());
1048
    }
1049
 
1050
    /**
1051
     * Definitions of the additional options that this course format uses for course
1052
     *
1053
     * This function may be called often, it should be as fast as possible.
1054
     * Avoid using get_string() method, use "new lang_string()" instead
1055
     * It is not recommended to use dynamic or course-dependant expressions here
1056
     * This function may be also called when course does not exist yet.
1057
     *
1058
     * Option names must be different from fields in the {course} talbe or any form elements on
1059
     * course edit form, it may even make sence to use special prefix for them.
1060
     *
1061
     * Each option must have the option name as a key and the array of properties as a value:
1062
     * 'default' - default value for this option (assumed null if not specified)
1063
     * 'type' - type of the option value (PARAM_INT, PARAM_RAW, etc.)
1064
     *
1065
     * Additional properties used by default implementation of
1066
     * course_format::create_edit_form_elements() (calls this method with $foreditform = true)
1067
     * 'label' - localised human-readable label for the edit form
1068
     * 'element_type' - type of the form element, default 'text'
1069
     * 'element_attributes' - additional attributes for the form element, these are 4th and further
1070
     *    arguments in the moodleform::addElement() method
1071
     * 'help' - string for help button. Note that if 'help' value is 'myoption' then the string with
1072
     *    the name 'myoption_help' must exist in the language file
1073
     * 'help_component' - language component to look for help string, by default this the component
1074
     *    for this course format
1075
     *
1076
     * This is an interface for creating simple form elements. If format plugin wants to use other
1077
     * methods such as disableIf, it can be done by overriding create_edit_form_elements().
1078
     *
1079
     * Course format options can be accessed as:
1080
     * $this->get_course()->OPTIONNAME (inside the format class)
1081
     * course_get_format($course)->get_course()->OPTIONNAME (outside of format class)
1082
     *
1083
     * All course options are returned by calling:
1084
     * $this->get_format_options();
1085
     *
1086
     * @param bool $foreditform
1087
     * @return array of options
1088
     */
1089
    public function course_format_options($foreditform = false) {
1090
        return array();
1091
    }
1092
 
1093
    /**
1094
     * Definitions of the additional options that this course format uses for section
1095
     *
1096
     * See course_format::course_format_options() for return array definition.
1097
     *
1098
     * Additionally section format options may have property 'cache' set to true
1099
     * if this option needs to be cached in get_fast_modinfo(). The 'cache' property
1100
     * is recommended to be set only for fields used in course_format::get_section_name(),
1101
     * course_format::extend_course_navigation() and course_format::get_view_url()
1102
     *
1103
     * For better performance cached options are recommended to have 'cachedefault' property
1104
     * Unlike 'default', 'cachedefault' should be static and not access get_config().
1105
     *
1106
     * Regardless of value of 'cache' all options are accessed in the code as
1107
     * $sectioninfo->OPTIONNAME
1108
     * where $sectioninfo is instance of section_info, returned by
1109
     * get_fast_modinfo($course)->get_section_info($sectionnum)
1110
     * or get_fast_modinfo($course)->get_section_info_all()
1111
     *
1112
     * All format options for particular section are returned by calling:
1113
     * $this->get_format_options($section);
1114
     *
1115
     * @param bool $foreditform
1116
     * @return array
1117
     */
1118
    public function section_format_options($foreditform = false) {
1119
        return array();
1120
    }
1121
 
1122
    /**
1123
     * Returns the format options stored for this course or course section
1124
     *
1125
     * When overriding please note that this function is called from rebuild_course_cache()
1126
     * and section_info object, therefore using of get_fast_modinfo() and/or any function that
1127
     * accesses it may lead to recursion.
1128
     *
1129
     * @param null|int|stdClass|section_info $section if null the course format options will be returned
1130
     *     otherwise options for specified section will be returned. This can be either
1131
     *     section object or relative section number (field course_sections.section)
1132
     * @return array
1133
     */
1134
    public function get_format_options($section = null) {
1135
        global $DB;
1136
        if ($section === null) {
1137
            $options = $this->course_format_options();
1138
        } else {
1139
            $options = $this->section_format_options();
1140
        }
1141
        if (empty($options)) {
1142
            // There are no option for course/sections anyway, no need to go further.
1143
            return array();
1144
        }
1145
        if ($section === null) {
1146
            // Course format options will be returned.
1147
            $sectionid = 0;
1148
        } else if ($this->courseid && isset($section->id)) {
1149
            // Course section format options will be returned.
1150
            $sectionid = $section->id;
1151
        } else if ($this->courseid && is_int($section) &&
1152
                ($sectionobj = $DB->get_record('course_sections',
1153
                        array('section' => $section, 'course' => $this->courseid), 'id'))) {
1154
            // Course section format options will be returned.
1155
            $sectionid = $sectionobj->id;
1156
        } else {
1157
            // Non-existing (yet) section was passed as an argument
1158
            // default format options for course section will be returned.
1159
            $sectionid = -1;
1160
        }
1161
        if (!array_key_exists($sectionid, $this->formatoptions)) {
1162
            $this->formatoptions[$sectionid] = array();
1163
            // First fill with default values.
1164
            foreach ($options as $optionname => $optionparams) {
1165
                $this->formatoptions[$sectionid][$optionname] = null;
1166
                if (array_key_exists('default', $optionparams)) {
1167
                    $this->formatoptions[$sectionid][$optionname] = $optionparams['default'];
1168
                }
1169
            }
1170
            if ($this->courseid && $sectionid !== -1) {
1171
                // Overwrite the default options values with those stored in course_format_options table
1172
                // nothing can be stored if we are interested in generic course ($this->courseid == 0)
1173
                // or generic section ($sectionid === 0).
1174
                $records = $DB->get_records('course_format_options',
1175
                        array('courseid' => $this->courseid,
1176
                              'format' => $this->format,
1177
                              'sectionid' => $sectionid
1178
                            ), '', 'id,name,value');
1179
                $indexedrecords = [];
1180
                foreach ($records as $record) {
1181
                    $indexedrecords[$record->name] = $record->value;
1182
                }
1183
                foreach ($options as $optionname => $option) {
1184
                    contract_value($this->formatoptions[$sectionid], $indexedrecords, $option, $optionname);
1185
                }
1186
            }
1187
        }
1188
        return $this->formatoptions[$sectionid];
1189
    }
1190
 
1191
    /**
1192
     * Adds format options elements to the course/section edit form
1193
     *
1194
     * This function is called from course_edit_form::definition_after_data()
1195
     *
1196
     * @param \MoodleQuickForm $mform form the elements are added to
1197
     * @param bool $forsection 'true' if this is a section edit form, 'false' if this is course edit form
1198
     * @return array array of references to the added form elements
1199
     */
1200
    public function create_edit_form_elements(&$mform, $forsection = false) {
1201
        $elements = array();
1202
        if ($forsection) {
1203
            $options = $this->section_format_options(true);
1204
        } else {
1205
            $options = $this->course_format_options(true);
1206
        }
1207
        foreach ($options as $optionname => $option) {
1208
            if (!isset($option['element_type'])) {
1209
                $option['element_type'] = 'text';
1210
            }
1211
            $args = array($option['element_type'], $optionname, $option['label']);
1212
            if (!empty($option['element_attributes'])) {
1213
                $args = array_merge($args, $option['element_attributes']);
1214
            }
1215
            $elements[] = call_user_func_array(array($mform, 'addElement'), $args);
1216
            if (isset($option['help'])) {
1217
                $helpcomponent = 'format_'. $this->get_format();
1218
                if (isset($option['help_component'])) {
1219
                    $helpcomponent = $option['help_component'];
1220
                }
1221
                $mform->addHelpButton($optionname, $option['help'], $helpcomponent);
1222
            }
1223
            if (isset($option['type'])) {
1224
                $mform->setType($optionname, $option['type']);
1225
            }
1226
            if (isset($option['default']) && !array_key_exists($optionname, $mform->_defaultValues)) {
1227
                // Set defaults for the elements in the form.
1228
                // Since we call this method after set_data() make sure that we don't override what was already set.
1229
                $mform->setDefault($optionname, $option['default']);
1230
            }
1231
        }
1232
 
1233
        if (!$forsection && empty($this->courseid)) {
1234
            // Check if course end date form field should be enabled by default.
1235
            // If a default date is provided to the form element, it is magically enabled by default in the
1236
            // MoodleQuickForm_date_time_selector class, otherwise it's disabled by default.
1237
            if (get_config('moodlecourse', 'courseenddateenabled')) {
1238
                // At this stage (this is called from definition_after_data) course data is already set as default.
1239
                // We can not overwrite what is in the database.
1240
                $mform->setDefault('enddate', $this->get_default_course_enddate($mform));
1241
            }
1242
        }
1243
 
1244
        return $elements;
1245
    }
1246
 
1247
    /**
1248
     * Override if you need to perform some extra validation of the format options
1249
     *
1250
     * @param array $data array of ("fieldname"=>value) of submitted data
1251
     * @param array $files array of uploaded files "element_name"=>tmp_file_path
1252
     * @param array $errors errors already discovered in edit form validation
1253
     * @return array of "element_name"=>"error_description" if there are errors,
1254
     *         or an empty array if everything is OK.
1255
     *         Do not repeat errors from $errors param here
1256
     */
1257
    public function edit_form_validation($data, $files, $errors) {
1258
        return array();
1259
    }
1260
 
1261
    /**
1262
     * Prepares values of course or section format options before storing them in DB
1263
     *
1264
     * If an option has invalid value it is not returned
1265
     *
1266
     * @param array $rawdata associative array of the proposed course/section format options
1267
     * @param int|null $sectionid null if it is course format option
1268
     * @return array array of options that have valid values
1269
     */
1270
    protected function validate_format_options(array $rawdata, int $sectionid = null): array {
1271
        if (!$sectionid) {
1272
            $allformatoptions = $this->course_format_options(true);
1273
        } else {
1274
            $allformatoptions = $this->section_format_options(true);
1275
        }
1276
        $data = array_intersect_key($rawdata, $allformatoptions);
1277
        foreach ($data as $key => $value) {
1278
            $option = $allformatoptions[$key] + ['type' => PARAM_RAW, 'element_type' => null, 'element_attributes' => [[]]];
1279
            expand_value($data, $data, $option, $key);
1280
            if ($option['element_type'] === 'select' && !array_key_exists($data[$key], $option['element_attributes'][0])) {
1281
                // Value invalid for select element, skip.
1282
                unset($data[$key]);
1283
            }
1284
        }
1285
        return $data;
1286
    }
1287
 
1288
    /**
1289
     * Validates format options for the course
1290
     *
1291
     * @param array $data data to insert/update
1292
     * @return array array of options that have valid values
1293
     */
1294
    public function validate_course_format_options(array $data): array {
1295
        return $this->validate_format_options($data);
1296
    }
1297
 
1298
    /**
1299
     * Updates format options for a course or section
1300
     *
1301
     * If $data does not contain property with the option name, the option will not be updated
1302
     *
1303
     * @param stdClass|array $data return value from moodleform::get_data() or array with data
1304
     * @param null|int $sectionid null if these are options for course or section id (course_sections.id)
1305
     *     if these are options for section
1306
     * @return bool whether there were any changes to the options values
1307
     */
1308
    protected function update_format_options($data, $sectionid = null) {
1309
        global $DB;
1310
        $data = $this->validate_format_options((array)$data, $sectionid);
1311
        if (!$sectionid) {
1312
            $allformatoptions = $this->course_format_options();
1313
            $sectionid = 0;
1314
        } else {
1315
            $allformatoptions = $this->section_format_options();
1316
        }
1317
        if (empty($allformatoptions)) {
1318
            // Nothing to update anyway.
1319
            return false;
1320
        }
1321
        $defaultoptions = array();
1322
        $cached = array();
1323
        foreach ($allformatoptions as $key => $option) {
1324
            $defaultoptions[$key] = null;
1325
            if (array_key_exists('default', $option)) {
1326
                $defaultoptions[$key] = $option['default'];
1327
            }
1328
            expand_value($defaultoptions, $defaultoptions, $option, $key);
1329
            $cached[$key] = ($sectionid === 0 || !empty($option['cache']));
1330
        }
1331
        $records = $DB->get_records('course_format_options',
1332
                array('courseid' => $this->courseid,
1333
                      'format' => $this->format,
1334
                      'sectionid' => $sectionid
1335
                    ), '', 'name,id,value');
1336
        $changed = $needrebuild = false;
1337
        foreach ($defaultoptions as $key => $value) {
1338
            if (isset($records[$key])) {
1339
                if (array_key_exists($key, $data) && $records[$key]->value != $data[$key]) {
1340
                    $DB->set_field('course_format_options', 'value',
1341
                            $data[$key], array('id' => $records[$key]->id));
1342
                    $changed = true;
1343
                    $needrebuild = $needrebuild || $cached[$key];
1344
                }
1345
            } else {
1346
                if (array_key_exists($key, $data) && $data[$key] !== $value) {
1347
                    $newvalue = $data[$key];
1348
                    $changed = true;
1349
                    $needrebuild = $needrebuild || $cached[$key];
1350
                } else {
1351
                    $newvalue = $value;
1352
                    // We still insert entry in DB but there are no changes from user point of
1353
                    // view and no need to call rebuild_course_cache().
1354
                }
1355
                $DB->insert_record('course_format_options', array(
1356
                    'courseid' => $this->courseid,
1357
                    'format' => $this->format,
1358
                    'sectionid' => $sectionid,
1359
                    'name' => $key,
1360
                    'value' => $newvalue
1361
                ));
1362
            }
1363
        }
1364
        if ($needrebuild) {
1365
            if ($sectionid) {
1366
                // Invalidate the section cache by given section id.
1367
                course_modinfo::purge_course_section_cache_by_id($this->courseid, $sectionid);
1368
                // Partial rebuild sections that have been invalidated.
1369
                rebuild_course_cache($this->courseid, true, true);
1370
            } else {
1371
                // Full rebuild if sectionid is null.
1372
                rebuild_course_cache($this->courseid);
1373
            }
1374
        }
1375
        if ($changed) {
1376
            // Reset internal caches.
1377
            if (!$sectionid) {
1378
                $this->course = false;
1379
            }
1380
            unset($this->formatoptions[$sectionid]);
1381
        }
1382
        return $changed;
1383
    }
1384
 
1385
    /**
1386
     * Updates format options for a course
1387
     *
1388
     * If $data does not contain property with the option name, the option will not be updated
1389
     *
1390
     * @param stdClass|array $data return value from moodleform::get_data() or array with data
1391
     * @param stdClass $oldcourse if this function is called from update_course()
1392
     *     this object contains information about the course before update
1393
     * @return bool whether there were any changes to the options values
1394
     */
1395
    public function update_course_format_options($data, $oldcourse = null) {
1396
        return $this->update_format_options($data);
1397
    }
1398
 
1399
    /**
1400
     * Updates format options for a section
1401
     *
1402
     * Section id is expected in $data->id (or $data['id'])
1403
     * If $data does not contain property with the option name, the option will not be updated
1404
     *
1405
     * @param stdClass|array $data return value from moodleform::get_data() or array with data
1406
     * @return bool whether there were any changes to the options values
1407
     */
1408
    public function update_section_format_options($data) {
1409
        $data = (array)$data;
1410
        return $this->update_format_options($data, $data['id']);
1411
    }
1412
 
1413
    /**
1414
     * Return an instance of moodleform to edit a specified section
1415
     *
1416
     * Default implementation returns instance of editsection_form that automatically adds
1417
     * additional fields defined in course_format::section_format_options()
1418
     *
1419
     * Format plugins may extend editsection_form if they want to have custom edit section form.
1420
     *
1421
     * @param mixed $action the action attribute for the form. If empty defaults to auto detect the
1422
     *              current url. If a moodle_url object then outputs params as hidden variables.
1423
     * @param array $customdata the array with custom data to be passed to the form
1424
     *     /course/editsection.php passes section_info object in 'cs' field
1425
     *     for filling availability fields
1426
     * @return \moodleform
1427
     */
1428
    public function editsection_form($action, $customdata = array()) {
1429
        global $CFG;
1430
        require_once($CFG->dirroot. '/course/editsection_form.php');
1431
        if (!array_key_exists('course', $customdata)) {
1432
            $customdata['course'] = $this->get_course();
1433
        }
1434
        return new editsection_form($action, $customdata);
1435
    }
1436
 
1437
    /**
1438
     * Allows course format to execute code on moodle_page::set_course()
1439
     *
1440
     * @param moodle_page $page instance of page calling set_course
1441
     */
1442
    public function page_set_course(moodle_page $page) {
1443
    }
1444
 
1445
    /**
1446
     * Allows course format to execute code on moodle_page::set_cm()
1447
     *
1448
     * Current module can be accessed as $page->cm (returns instance of cm_info)
1449
     *
1450
     * @param moodle_page $page instance of page calling set_cm
1451
     */
1452
    public function page_set_cm(moodle_page $page) {
1453
    }
1454
 
1455
    /**
1456
     * Course-specific information to be output on any course page (usually above navigation bar)
1457
     *
1458
     * Example of usage:
1459
     * define
1460
     * class format_FORMATNAME_XXX implements renderable {}
1461
     *
1462
     * create format renderer in course/format/FORMATNAME/renderer.php, define rendering function:
1463
     * class format_FORMATNAME_renderer extends plugin_renderer_base {
1464
     *     protected function render_format_FORMATNAME_XXX(format_FORMATNAME_XXX $xxx) {
1465
     *         return html_writer::tag('div', 'This is my header/footer');
1466
     *     }
1467
     * }
1468
     *
1469
     * Return instance of format_FORMATNAME_XXX in this function, the appropriate method from
1470
     * plugin renderer will be called
1471
     *
1472
     * @return null|\renderable null for no output or object with data for plugin renderer
1473
     */
1474
    public function course_header() {
1475
        return null;
1476
    }
1477
 
1478
    /**
1479
     * Course-specific information to be output on any course page (usually in the beginning of
1480
     * standard footer)
1481
     *
1482
     * See course_format::course_header() for usage
1483
     *
1484
     * @return null|\renderable null for no output or object with data for plugin renderer
1485
     */
1486
    public function course_footer() {
1487
        return null;
1488
    }
1489
 
1490
    /**
1491
     * Course-specific information to be output immediately above content on any course page
1492
     *
1493
     * See course_format::course_header() for usage
1494
     *
1495
     * @return null|\renderable null for no output or object with data for plugin renderer
1496
     */
1497
    public function course_content_header() {
1498
        return null;
1499
    }
1500
 
1501
    /**
1502
     * Course-specific information to be output immediately below content on any course page
1503
     *
1504
     * See course_format::course_header() for usage
1505
     *
1506
     * @return null|\renderable null for no output or object with data for plugin renderer
1507
     */
1508
    public function course_content_footer() {
1509
        return null;
1510
    }
1511
 
1512
    /**
1513
     * Returns instance of page renderer used by this plugin
1514
     *
1515
     * @param moodle_page $page
1516
     * @return \renderer_base
1517
     */
1518
    public function get_renderer(moodle_page $page) {
1519
        try {
1520
            $renderer = $page->get_renderer('format_'. $this->get_format());
1521
        } catch (moodle_exception $e) {
1522
            $formatname = $this->get_format();
1523
            $expectedrenderername = 'format_'. $this->get_format() . '\output\renderer';
1524
            debugging(
1525
                "The '{$formatname}' course format does not define the {$expectedrenderername} renderer class. This is required since Moodle 4.0.",
1526
                 DEBUG_DEVELOPER
1527
            );
1528
            $renderer = new legacy_renderer($page, null);
1529
        }
1530
 
1531
        return $renderer;
1532
    }
1533
 
1534
    /**
1535
     * Returns instance of output component used by this plugin
1536
     *
1537
     * @throws coding_exception if the format class does not extends the original core one.
1538
     * @param string $outputname the element to render (section, activity...)
1539
     * @return string the output component classname
1540
     */
1541
    public function get_output_classname(string $outputname): string {
1542
        // The core output class.
1543
        $baseclass = "core_courseformat\\output\\local\\$outputname";
1544
 
1545
        // Look in this format and any parent formats before we get to the base one.
1546
        $classes = array_merge([get_class($this)], class_parents($this));
1547
        foreach ($classes as $component) {
1548
            if ($component === self::class) {
1549
                break;
1550
            }
1551
 
1552
            // Because course formats are in the root namespace, there is no need to process the
1553
            // class name - it is already a Frankenstyle component name beginning 'format_'.
1554
 
1555
            // Check if there is a specific class in this format.
1556
            $outputclass = "$component\\output\\courseformat\\$outputname";
1557
            if (class_exists($outputclass)) {
1558
                // Check that the outputclass is a subclass of the base class.
1559
                if (!is_subclass_of($outputclass, $baseclass)) {
1560
                    throw new coding_exception("The \"$outputclass\" must extend \"$baseclass\"");
1561
                }
1562
                return $outputclass;
1563
            }
1564
        }
1565
 
1566
        return $baseclass;
1567
    }
1568
 
1569
    /**
1570
     * Returns true if the specified section is current
1571
     *
1572
     * By default we analyze $course->marker
1573
     *
1574
     * @param int|stdClass|section_info $section
1575
     * @return bool
1576
     */
1577
    public function is_section_current($section) {
1578
        if (is_object($section)) {
1579
            $sectionnum = $section->section;
1580
        } else {
1581
            $sectionnum = $section;
1582
        }
1583
        return ($sectionnum && ($course = $this->get_course()) && $course->marker == $sectionnum);
1584
    }
1585
 
1586
    /**
1587
     * Returns if an specific section is visible to the current user.
1588
     *
1589
     * Formats can overrride this method to implement any special section logic.
1590
     *
1591
     * @param section_info $section the section modinfo
1592
     * @return bool;
1593
     */
1594
    public function is_section_visible(section_info $section): bool {
1595
        // Previous to Moodle 4.0 thas logic was hardcoded. To prevent errors in the contrib plugins
1596
        // the default logic is the same required for topics and weeks format and still uses
1597
        // a "hiddensections" format setting.
1598
        $course = $this->get_course();
1599
        $hidesections = $course->hiddensections ?? true;
1600
        // Show the section if the user is permitted to access it, OR if it's not available
1601
        // but there is some available info text which explains the reason & should display,
1602
        // OR it is hidden but the course has a setting to display hidden sections as unavailable.
1603
        return $section->uservisible ||
1604
            ($section->visible && !$section->available && !empty($section->availableinfo)) ||
1605
            (!$section->visible && !$hidesections);
1606
    }
1607
 
1608
    /**
1609
     * return true if the course editor must be displayed.
1610
     *
1611
     * @param array|null $capabilities array of capabilities a user needs to have to see edit controls in general.
1612
     *  If null or not specified, the user needs to have 'moodle/course:manageactivities'.
1613
     * @return bool true if edit controls must be displayed
1614
     */
1615
    public function show_editor(?array $capabilities = ['moodle/course:manageactivities']): bool {
1616
        global $PAGE;
1617
        $course = $this->get_course();
1618
        $coursecontext = context_course::instance($course->id);
1619
        if ($capabilities === null) {
1620
            $capabilities = ['moodle/course:manageactivities'];
1621
        }
1622
        return $PAGE->user_is_editing() && has_all_capabilities($capabilities, $coursecontext);
1623
    }
1624
 
1625
    /**
1626
     * Check if the group mode can be displayed.
1627
     * @param cm_info $cm the activity module
1628
     * @return bool
1629
     */
1630
    public function show_groupmode(cm_info $cm): bool {
1631
        if (!plugin_supports('mod', $cm->modname, FEATURE_GROUPS, false)) {
1632
            return false;
1633
        }
1634
        if (!has_capability('moodle/course:manageactivities', $cm->context)) {
1635
            return false;
1636
        }
1637
        return true;
1638
    }
1639
 
1640
    /**
1641
     * Allows to specify for modinfo that section is not available even when it is visible and conditionally available.
1642
     *
1643
     * Note: affected user can be retrieved as: $section->modinfo->userid
1644
     *
1645
     * Course format plugins can override the method to change the properties $available and $availableinfo that were
1646
     * calculated by conditional availability.
1647
     * To make section unavailable set:
1648
     *     $available = false;
1649
     * To make unavailable section completely hidden set:
1650
     *     $availableinfo = '';
1651
     * To make unavailable section visible with availability message set:
1652
     *     $availableinfo = get_string('sectionhidden', 'format_xxx');
1653
     *
1654
     * @param section_info $section
1655
     * @param bool $available the 'available' propery of the section_info as it was evaluated by conditional availability.
1656
     *     Can be changed by the method but 'false' can not be overridden by 'true'.
1657
     * @param string $availableinfo the 'availableinfo' propery of the section_info as it was evaluated by conditional availability.
1658
     *     Can be changed by the method
1659
     */
1660
    public function section_get_available_hook(section_info $section, &$available, &$availableinfo) {
1661
    }
1662
 
1663
    /**
1664
     * Whether this format allows to delete sections
1665
     *
1666
     * If format supports deleting sections it is also recommended to define language string
1667
     * 'deletesection' inside the format.
1668
     *
1669
     * Do not call this function directly, instead use course_can_delete_section()
1670
     *
1671
     * @param int|stdClass|section_info $section
1672
     * @return bool
1673
     */
1674
    public function can_delete_section($section) {
1675
        return false;
1676
    }
1677
 
1678
    /**
1679
     * Deletes a section
1680
     *
1681
     * Do not call this function directly, instead call course_delete_section()
1682
     *
1683
     * @param int|stdClass|section_info $sectionornum
1684
     * @param bool $forcedeleteifnotempty if set to false section will not be deleted if it has modules in it.
1685
     * @return bool whether section was deleted
1686
     */
1687
    public function delete_section($sectionornum, $forcedeleteifnotempty = false) {
1688
        global $DB;
1689
        if (!$this->uses_sections()) {
1690
            // Not possible to delete section if sections are not used.
1691
            return false;
1692
        }
1693
        if (is_object($sectionornum)) {
1694
            $section = $sectionornum;
1695
        } else {
1696
            $section = $DB->get_record(
1697
                'course_sections',
1698
                ['course' => $this->get_courseid(), 'section' => $sectionornum],
1699
                'id,section,sequence,summary');
1700
        }
1701
        if (!$section || !$section->section) {
1702
            // Not possible to delete 0-section.
1703
            return false;
1704
        }
1705
 
1706
        if (!$forcedeleteifnotempty && (!empty($section->sequence) || !empty($section->summary))) {
1707
            return false;
1708
        }
1709
 
1710
        $course = $this->get_course();
1711
 
1712
        // Remove the marker if it points to this section.
1713
        if ($section->section == $course->marker) {
1714
            course_set_marker($course->id, 0);
1715
        }
1716
 
1717
        $lastsection = $DB->get_field_sql('SELECT max(section) from {course_sections}
1718
                            WHERE course = ?', array($course->id));
1719
 
1720
        // Find out if we need to descrease the 'numsections' property later.
1721
        $courseformathasnumsections = array_key_exists('numsections',
1722
            $this->get_format_options());
1723
        $decreasenumsections = $courseformathasnumsections && ($section->section <= $course->numsections);
1724
 
1725
        // Move the section to the end.
1726
        move_section_to($course, $section->section, $lastsection, true);
1727
 
1728
        // Delete all modules from the section.
1729
        foreach (preg_split('/,/', $section->sequence, -1, PREG_SPLIT_NO_EMPTY) as $cmid) {
1730
            course_delete_module($cmid);
1731
        }
1732
 
1733
        // Delete section and it's format options.
1734
        $DB->delete_records('course_format_options', array('sectionid' => $section->id));
1735
        $DB->delete_records('course_sections', array('id' => $section->id));
1736
        // Invalidate the section cache by given section id.
1737
        course_modinfo::purge_course_section_cache_by_id($course->id, $section->id);
1738
        // Partial rebuild section cache that has been purged.
1739
        rebuild_course_cache($course->id, true, true);
1740
 
1741
        // Delete section summary files.
1742
        $context = \context_course::instance($course->id);
1743
        $fs = get_file_storage();
1744
        $fs->delete_area_files($context->id, 'course', 'section', $section->id);
1745
 
1746
        // Descrease 'numsections' if needed.
1747
        if ($decreasenumsections) {
1748
            $this->update_course_format_options(array('numsections' => $course->numsections - 1));
1749
        }
1750
 
1751
        return true;
1752
    }
1753
 
1754
    /**
1755
     * Wrapper for course_delete_module method.
1756
     *
1757
     * Format plugins can override this method to provide their own implementation of course_delete_module.
1758
     *
1759
     * @param cm_info $cm the course module information
1760
     * @param bool $async whether or not to try to delete the module using an adhoc task. Async also depends on a plugin hook.
1761
     * @throws moodle_exception
1762
     */
1763
    public function delete_module(cm_info $cm, bool $async = false) {
1764
        course_delete_module($cm->id, $async);
1765
    }
1766
 
1767
    /**
1768
     * Moves a section just after the target section.
1769
     *
1770
     * @param section_info $section the section to move
1771
     * @param section_info $destination the section that should be below the moved section
1772
     * @return boolean if the section can be moved or not
1773
     */
1774
    public function move_section_after(section_info $section, section_info $destination): bool {
1775
        if ($section->section == $destination->section || $section->section == $destination->section + 1) {
1776
            return true;
1777
        }
1778
        // The move_section_to moves relative to the section to move. However, this
1779
        // method will move the target section always after the destination.
1780
        if ($section->section > $destination->section) {
1781
            $newsectionnumber = $destination->section + 1;
1782
        } else {
1783
            $newsectionnumber = $destination->section;
1784
        }
1785
        return move_section_to(
1786
            $this->get_course(),
1787
            $section->section,
1788
            $newsectionnumber
1789
        );
1790
    }
1791
 
1792
    /**
1793
     * Prepares the templateable object to display section name
1794
     *
1795
     * @param \section_info|\stdClass $section
1796
     * @param bool $linkifneeded
1797
     * @param bool $editable
1798
     * @param null|lang_string|string $edithint
1799
     * @param null|lang_string|string $editlabel
1800
     * @return \core\output\inplace_editable
1801
     */
1802
    public function inplace_editable_render_section_name($section, $linkifneeded = true,
1803
                                                         $editable = null, $edithint = null, $editlabel = null) {
1804
        global $USER, $CFG;
1805
        require_once($CFG->dirroot.'/course/lib.php');
1806
 
1807
        if ($editable === null) {
1808
            $editable = !empty($USER->editing) && has_capability('moodle/course:update',
1809
                    context_course::instance($section->course));
1810
        }
1811
 
1812
        $displayvalue = $title = get_section_name($section->course, $section);
1813
        if ($linkifneeded) {
1814
            // Display link under the section name if the course format setting is to display one section per page.
1815
            $url = course_get_url($section->course, $section->section, array('navigation' => true));
1816
            if ($url) {
1817
                $displayvalue = html_writer::link($url, $title);
1818
            }
1819
            $itemtype = 'sectionname';
1820
        } else {
1821
            // If $linkifneeded==false, we never display the link (this is used when rendering the section header).
1822
            // Itemtype 'sectionnamenl' (nl=no link) will tell the callback that link should not be rendered -
1823
            // there is no other way callback can know where we display the section name.
1824
            $itemtype = 'sectionnamenl';
1825
        }
1826
        if (empty($edithint)) {
1827
            $edithint = new lang_string('editsectionname');
1828
        }
1829
        if (empty($editlabel)) {
1830
            $editlabel = new lang_string('newsectionname', '', $title);
1831
        }
1832
 
1833
        return new \core\output\inplace_editable('format_' . $this->format, $itemtype, $section->id, $editable,
1834
            $displayvalue, $section->name, $edithint, $editlabel);
1835
    }
1836
 
1837
    /**
1838
     * Updates the value in the database and modifies this object respectively.
1839
     *
1840
     * ALWAYS check user permissions before performing an update! Throw exceptions if permissions are not sufficient
1841
     * or value is not legit.
1842
     *
1843
     * @param stdClass $section
1844
     * @param string $itemtype
1845
     * @param mixed $newvalue
1846
     * @return ?\core\output\inplace_editable
1847
     */
1848
    public function inplace_editable_update_section_name($section, $itemtype, $newvalue) {
1849
        if ($itemtype === 'sectionname' || $itemtype === 'sectionnamenl') {
1850
            $context = context_course::instance($section->course);
1851
            external_api::validate_context($context);
1852
            require_capability('moodle/course:update', $context);
1853
 
1854
            $newtitle = clean_param($newvalue, PARAM_TEXT);
1855
            if (strval($section->name) !== strval($newtitle)) {
1856
                course_update_section($section->course, $section, array('name' => $newtitle));
1857
            }
1858
            return $this->inplace_editable_render_section_name($section, ($itemtype === 'sectionname'), true);
1859
        }
1860
    }
1861
 
1862
 
1863
    /**
1864
     * Returns the default end date value based on the start date.
1865
     *
1866
     * This is the default implementation for course formats, it is based on
1867
     * moodlecourse/courseduration setting. Course formats like format_weeks for
1868
     * example can overwrite this method and return a value based on their internal options.
1869
     *
1870
     * @param \MoodleQuickForm $mform
1871
     * @param array $fieldnames The form - field names mapping.
1872
     * @return int
1873
     */
1874
    public function get_default_course_enddate($mform, $fieldnames = array()) {
1875
 
1876
        if (empty($fieldnames)) {
1877
            $fieldnames = array('startdate' => 'startdate');
1878
        }
1879
 
1880
        $startdate = $this->get_form_start_date($mform, $fieldnames);
1881
        $courseduration = intval(get_config('moodlecourse', 'courseduration'));
1882
        if (!$courseduration) {
1883
            // Default, it should be already set during upgrade though.
1884
            $courseduration = YEARSECS;
1885
        }
1886
 
1887
        return $startdate + $courseduration;
1888
    }
1889
 
1890
    /**
1891
     * Indicates whether the course format supports the creation of the Announcements forum.
1892
     *
1893
     * For course format plugin developers, please override this to return true if you want the Announcements forum
1894
     * to be created upon course creation.
1895
     *
1896
     * @return bool
1897
     */
1898
    public function supports_news() {
1899
        // For backwards compatibility, check if default blocks include the news_items block.
1900
        $defaultblocks = $this->get_default_blocks();
1901
        foreach ($defaultblocks as $blocks) {
1902
            if (in_array('news_items', $blocks)) {
1903
                return true;
1904
            }
1905
        }
1906
        // Return false by default.
1907
        return false;
1908
    }
1909
 
1910
    /**
1911
     * Get the start date value from the course settings page form.
1912
     *
1913
     * @param \MoodleQuickForm $mform
1914
     * @param array $fieldnames The form - field names mapping.
1915
     * @return int
1916
     */
1917
    protected function get_form_start_date($mform, $fieldnames) {
1918
        $startdate = $mform->getElementValue($fieldnames['startdate']);
1919
        return $mform->getElement($fieldnames['startdate'])->exportValue($startdate);
1920
    }
1921
 
1922
    /**
1923
     * Returns whether this course format allows the activity to
1924
     * have "triple visibility state" - visible always, hidden on course page but available, hidden.
1925
     *
1926
     * @param stdClass|cm_info $cm course module (may be null if we are displaying a form for adding a module)
1927
     * @param stdClass|section_info $section section where this module is located or will be added to
1928
     * @return bool
1929
     */
1930
    public function allow_stealth_module_visibility($cm, $section) {
1931
        return false;
1932
    }
1933
 
1934
    /**
1935
     * Callback used in WS core_course_edit_section when teacher performs an AJAX action on a section (show/hide)
1936
     *
1937
     * Access to the course is already validated in the WS but the callback has to make sure
1938
     * that particular action is allowed by checking capabilities
1939
     *
1940
     * Course formats should register
1941
     *
1942
     * @param stdClass|section_info $section
1943
     * @param string $action
1944
     * @param int $sr the section return
1945
     * @return null|array|stdClass any data for the Javascript post-processor (must be json-encodeable)
1946
     */
1947
    public function section_action($section, $action, $sr) {
1948
        global $PAGE;
1949
        if (!$this->uses_sections() || !$section->section) {
1950
            // No section actions are allowed if course format does not support sections.
1951
            // No actions are allowed on the 0-section by default (overwrite in course format if needed).
1952
            throw new moodle_exception('sectionactionnotsupported', 'core', null, s($action));
1953
        }
1954
 
1955
        $course = $this->get_course();
1956
        $coursecontext = context_course::instance($course->id);
1957
        $modinfo = $this->get_modinfo();
1958
        $renderer = $this->get_renderer($PAGE);
1959
 
1960
        if (!($section instanceof section_info)) {
1961
            $section = $modinfo->get_section_info($section->section);
1962
        }
1963
 
1964
        if (!is_null($sr)) {
1965
            $this->set_sectionnum($sr);
1966
        }
1967
 
1968
        switch($action) {
1969
            case 'hide':
1970
            case 'show':
1971
                require_capability('moodle/course:sectionvisibility', $coursecontext);
1972
                $visible = ($action === 'hide') ? 0 : 1;
1973
                course_update_section($course, $section, array('visible' => $visible));
1974
                break;
1975
            case 'refresh':
1976
                return [
1977
                    'content' => $renderer->course_section_updated($this, $section),
1978
                ];
1979
            default:
1980
                throw new moodle_exception('sectionactionnotsupported', 'core', null, s($action));
1981
        }
1982
 
1983
        return ['modules' => $this->get_section_modules_updated($section)];
1984
    }
1985
 
1986
    /**
1987
     * Return an array with all section modules content.
1988
     *
1989
     * This method is used in section_action method to generate the updated modules content
1990
     * after a modinfo change.
1991
     *
1992
     * @param section_info $section the section
1993
     * @return string[] the full modules content.
1994
     */
1995
    protected function get_section_modules_updated(section_info $section): array {
1996
        global $PAGE;
1997
 
1998
        $modules = [];
1999
 
2000
        if (!$this->uses_sections() || !$section->section) {
2001
            return $modules;
2002
        }
2003
 
2004
        // Load the cmlist output from the updated modinfo.
2005
        $renderer = $this->get_renderer($PAGE);
2006
        $modinfo = $this->get_modinfo();
2007
        $coursesections = $modinfo->sections;
2008
        if (array_key_exists($section->section, $coursesections)) {
2009
            foreach ($coursesections[$section->section] as $cmid) {
2010
                $cm = $modinfo->get_cm($cmid);
2011
                $modules[] = $renderer->course_section_updated_cm_item($this, $section, $cm);
2012
            }
2013
        }
2014
        return $modules;
2015
    }
2016
 
2017
    /**
2018
     * Return the plugin config settings for external functions,
2019
     * in some cases the configs will need formatting or be returned only if the current user has some capabilities enabled.
2020
     *
2021
     * @return array the list of configs
2022
     * @since Moodle 3.5
2023
     */
2024
    public function get_config_for_external() {
2025
        return array();
2026
    }
2027
 
2028
    /**
2029
     * Course deletion hook.
2030
     *
2031
     * Format plugins can override this method to clean any format specific data and dependencies.
2032
     *
2033
     */
2034
    public function delete_format_data() {
2035
        global $DB;
2036
        $course = $this->get_course();
2037
        // By default, formats store some most display specifics in a user preference.
2038
        $DB->delete_records('user_preferences', ['name' => 'coursesectionspreferences_' . $course->id]);
2039
    }
2040
 
2041
    /**
2042
     * Duplicate a section
2043
     *
2044
     * @param section_info $originalsection The section to be duplicated
2045
     * @return section_info The new duplicated section
2046
     * @since Moodle 4.2
2047
     */
2048
    public function duplicate_section(section_info $originalsection): section_info {
2049
        if (!$this->uses_sections()) {
2050
            throw new moodle_exception('sectionsnotsupported', 'core_courseformat');
2051
        }
2052
 
2053
        $course = $this->get_course();
2054
        $oldsectioninfo = get_fast_modinfo($course)->get_section_info($originalsection->section);
2055
        $newsection = course_create_section($course, $oldsectioninfo->section + 1); // Place new section after existing one.
2056
 
2057
        if (!empty($originalsection->name)) {
2058
            $newsection->name = get_string('duplicatedsection', 'moodle', $originalsection->name);
2059
        } else {
2060
            $newsection->name = $originalsection->name;
2061
        }
2062
        $newsection->summary = $originalsection->summary;
2063
        $newsection->summaryformat = $originalsection->summaryformat;
2064
        $newsection->visible = $originalsection->visible;
2065
        $newsection->availability = $originalsection->availability;
2066
        course_update_section($course, $newsection, $newsection);
2067
 
2068
        $modinfo = $this->get_modinfo();
2069
 
2070
        // Duplicate the section modules, should they exist.
2071
        if (array_key_exists($originalsection->section, $modinfo->sections)) {
2072
            foreach ($modinfo->sections[$originalsection->section] as $modnumber) {
2073
                $originalcm = $modinfo->cms[$modnumber];
2074
                duplicate_module($course, $originalcm, $newsection->id, false);
2075
            }
2076
        }
2077
 
2078
        return get_fast_modinfo($course)->get_section_info_by_id($newsection->id);
2079
    }
2080
 
2081
    /**
2082
     * Get the required javascript files for the course format.
2083
     *
2084
     * @return array The list of javascript files required by the course format.
2085
     */
2086
    public function get_required_jsfiles(): array {
2087
        return [];
2088
    }
2089
 
2090
    /**
2091
     * Determines whether section items can be removed from the navigation, just like the breadcrumb feature seen on activity pages.
2092
     * By default, it returns false but can be overridden by the course format to change the behaviour.
2093
     *
2094
     * @return bool True if sections can be removed, false otherwise.
2095
     */
2096
    public function can_sections_be_removed_from_navigation(): bool {
2097
        return false;
2098
    }
2099
}