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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
5
// it under the terms of the GNU General Public License as published by
6
// the Free Software Foundation, either version 3 of the License, or
7
// (at your option) any later version.
8
//
9
// Moodle is distributed in the hope that it will be useful,
10
// but WITHOUT ANY WARRANTY; without even the implied warranty of
11
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12
// 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
 * Lesson external API
19
 *
20
 * @package    mod_lesson
21
 * @category   external
22
 * @copyright  2017 Juan Leyva <juan@moodle.com>
23
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
24
 * @since      Moodle 3.3
25
 */
26
 
27
defined('MOODLE_INTERNAL') || die;
28
 
29
require_once($CFG->dirroot . '/mod/lesson/locallib.php');
30
 
31
use mod_lesson\external\lesson_summary_exporter;
32
use core_external\external_api;
33
use core_external\external_files;
34
use core_external\external_format_value;
35
use core_external\external_function_parameters;
36
use core_external\external_multiple_structure;
37
use core_external\external_single_structure;
38
use core_external\external_value;
39
use core_external\external_warnings;
40
use core_external\util;
41
 
42
/**
43
 * Lesson external functions
44
 *
45
 * @package    mod_lesson
46
 * @category   external
47
 * @copyright  2017 Juan Leyva <juan@moodle.com>
48
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
49
 * @since      Moodle 3.3
50
 */
51
class mod_lesson_external extends external_api {
52
 
53
    /**
54
     * Return a lesson record ready for being exported.
55
     *
56
     * @param  stdClass $lessonrecord lesson record
57
     * @param  string $password       lesson password
58
     * @return stdClass the lesson record ready for exporting.
59
     */
60
    protected static function get_lesson_summary_for_exporter($lessonrecord, $password = '') {
61
        global $USER;
62
 
63
        $lesson = new lesson($lessonrecord);
64
        $lesson->update_effective_access($USER->id);
65
        $lessonrecord->lang = $lesson->get_cm()->lang;
66
        $lessonavailable = $lesson->get_time_restriction_status() === false;
67
        $lessonavailable = $lessonavailable && $lesson->get_password_restriction_status($password) === false;
68
        $lessonavailable = $lessonavailable && $lesson->get_dependencies_restriction_status() === false;
69
        $canmanage = $lesson->can_manage();
70
 
71
        if (!$canmanage && !$lessonavailable) {
72
            $fields = array('intro', 'introfiles', 'mediafiles', 'practice', 'modattempts', 'usepassword',
73
                'grade', 'custom', 'ongoing', 'usemaxgrade',
74
                'maxanswers', 'maxattempts', 'review', 'nextpagedefault', 'feedback', 'minquestions',
75
                'maxpages', 'timelimit', 'retake', 'mediafile', 'mediaheight', 'mediawidth',
76
                'mediaclose', 'slideshow', 'width', 'height', 'bgcolor', 'displayleft', 'displayleftif',
77
                'progressbar');
78
 
79
            foreach ($fields as $field) {
80
                unset($lessonrecord->{$field});
81
            }
82
        }
83
 
84
        // Fields only for managers.
85
        if (!$canmanage) {
86
            $fields = array('password', 'dependency', 'conditions', 'activitylink', 'available', 'deadline',
87
                            'timemodified', 'completionendreached', 'completiontimespent');
88
 
89
            foreach ($fields as $field) {
90
                unset($lessonrecord->{$field});
91
            }
92
        }
93
        return $lessonrecord;
94
    }
95
 
96
    /**
97
     * Describes the parameters for get_lessons_by_courses.
98
     *
99
     * @return external_function_parameters
100
     * @since Moodle 3.3
101
     */
102
    public static function get_lessons_by_courses_parameters() {
103
        return new external_function_parameters (
104
            array(
105
                'courseids' => new external_multiple_structure(
106
                    new external_value(PARAM_INT, 'course id'), 'Array of course ids', VALUE_DEFAULT, array()
107
                ),
108
            )
109
        );
110
    }
111
 
112
    /**
113
     * Returns a list of lessons in a provided list of courses,
114
     * if no list is provided all lessons that the user can view will be returned.
115
     *
116
     * @param array $courseids Array of course ids
117
     * @return array of lessons details
118
     * @since Moodle 3.3
119
     */
120
    public static function get_lessons_by_courses($courseids = array()) {
121
        global $PAGE;
122
 
123
        $warnings = array();
124
        $returnedlessons = array();
125
 
126
        $params = array(
127
            'courseids' => $courseids,
128
        );
129
        $params = self::validate_parameters(self::get_lessons_by_courses_parameters(), $params);
130
 
131
        $mycourses = array();
132
        if (empty($params['courseids'])) {
133
            $mycourses = enrol_get_my_courses();
134
            $params['courseids'] = array_keys($mycourses);
135
        }
136
 
137
        // Ensure there are courseids to loop through.
138
        if (!empty($params['courseids'])) {
139
 
140
            list($courses, $warnings) = util::validate_courses($params['courseids'], $mycourses);
141
 
142
            // Get the lessons in this course, this function checks users visibility permissions.
143
            // We can avoid then additional validate_context calls.
144
            $lessons = get_all_instances_in_courses("lesson", $courses);
145
            foreach ($lessons as $lessonrecord) {
146
                $context = context_module::instance($lessonrecord->coursemodule);
147
 
148
                // Remove fields added by get_all_instances_in_courses.
149
                unset($lessonrecord->coursemodule, $lessonrecord->section, $lessonrecord->visible, $lessonrecord->groupmode,
150
                    $lessonrecord->groupingid);
151
 
152
                $lessonrecord = self::get_lesson_summary_for_exporter($lessonrecord);
153
 
154
                $exporter = new lesson_summary_exporter($lessonrecord, array('context' => $context));
155
                $lesson = $exporter->export($PAGE->get_renderer('core'));
156
                $lesson->name = \core_external\util::format_string($lesson->name, $context);
157
                $returnedlessons[] = $lesson;
158
            }
159
        }
160
        $result = array();
161
        $result['lessons'] = $returnedlessons;
162
        $result['warnings'] = $warnings;
163
        return $result;
164
    }
165
 
166
    /**
167
     * Describes the get_lessons_by_courses return value.
168
     *
169
     * @return external_single_structure
170
     * @since Moodle 3.3
171
     */
172
    public static function get_lessons_by_courses_returns() {
173
        return new external_single_structure(
174
            array(
175
                'lessons' => new external_multiple_structure(
176
                    lesson_summary_exporter::get_read_structure()
177
                ),
178
                'warnings' => new external_warnings(),
179
            )
180
        );
181
    }
182
 
183
    /**
184
     * Utility function for validating a lesson.
185
     *
186
     * @param int $lessonid lesson instance id
187
     * @return array array containing the lesson, course, context and course module objects
188
     * @since  Moodle 3.3
189
     */
190
    protected static function validate_lesson($lessonid) {
191
        global $DB, $USER;
192
 
193
        // Request and permission validation.
194
        $lessonrecord = $DB->get_record('lesson', array('id' => $lessonid), '*', MUST_EXIST);
195
        list($course, $cm) = get_course_and_cm_from_instance($lessonrecord, 'lesson');
196
 
197
        $lesson = new lesson($lessonrecord, $cm, $course);
198
        $lesson->update_effective_access($USER->id);
199
 
200
        $context = $lesson->context;
201
        self::validate_context($context);
202
 
203
        return array($lesson, $course, $cm, $context, $lessonrecord);
204
    }
205
 
206
    /**
207
     * Validates a new attempt.
208
     *
209
     * @param  lesson  $lesson lesson instance
210
     * @param  array   $params request parameters
211
     * @param  boolean $return whether to return the errors or throw exceptions
212
     * @return array          the errors (if return set to true)
213
     * @since  Moodle 3.3
214
     */
215
    protected static function validate_attempt(lesson $lesson, $params, $return = false) {
216
        global $USER, $CFG;
217
 
218
        $errors = array();
219
 
220
        // Avoid checkings for managers.
221
        if ($lesson->can_manage()) {
222
            return [];
223
        }
224
 
225
        // Dead line.
226
        if ($timerestriction = $lesson->get_time_restriction_status()) {
227
            $error = ["$timerestriction->reason" => userdate($timerestriction->time)];
228
            if (!$return) {
229
                throw new moodle_exception(key($error), 'lesson', '', current($error));
230
            }
231
            $errors[key($error)] = current($error);
232
        }
233
 
234
        // Password protected lesson code.
235
        if ($passwordrestriction = $lesson->get_password_restriction_status($params['password'])) {
236
            $error = ["passwordprotectedlesson" => \core_external\util::format_string($lesson->name, $lesson->context)];
237
            if (!$return) {
238
                throw new moodle_exception(key($error), 'lesson', '', current($error));
239
            }
240
            $errors[key($error)] = current($error);
241
        }
242
 
243
        // Check for dependencies.
244
        if ($dependenciesrestriction = $lesson->get_dependencies_restriction_status()) {
245
            $errorhtmllist = implode(get_string('and', 'lesson') . ', ', $dependenciesrestriction->errors);
246
            $error = ["completethefollowingconditions" => $dependenciesrestriction->dependentlesson->name . $errorhtmllist];
247
            if (!$return) {
248
                throw new moodle_exception(key($error), 'lesson', '', current($error));
249
            }
250
            $errors[key($error)] = current($error);
251
        }
252
 
253
        // To check only when no page is set (starting or continuing a lesson).
254
        if (empty($params['pageid'])) {
255
            // To avoid multiple calls, store the magic property firstpage.
256
            $lessonfirstpage = $lesson->firstpage;
257
            $lessonfirstpageid = $lessonfirstpage ? $lessonfirstpage->id : false;
258
 
259
            // Check if the lesson does not have pages.
260
            if (!$lessonfirstpageid) {
261
                $error = ["lessonnotready2" => null];
262
                if (!$return) {
263
                    throw new moodle_exception(key($error), 'lesson');
264
                }
265
                $errors[key($error)] = current($error);
266
            }
267
 
268
            // Get the number of retries (also referenced as attempts), and the last page seen.
269
            $attemptscount = $lesson->count_user_retries($USER->id);
270
            $lastpageseen = $lesson->get_last_page_seen($attemptscount);
271
 
272
            // Check if the user left a timed session with no retakes.
273
            if ($lastpageseen !== false && $lastpageseen != LESSON_EOL) {
274
                if ($lesson->left_during_timed_session($attemptscount) && $lesson->timelimit && !$lesson->retake) {
275
                    $error = ["leftduringtimednoretake" => null];
276
                    if (!$return) {
277
                        throw new moodle_exception(key($error), 'lesson');
278
                    }
279
                    $errors[key($error)] = current($error);
280
                }
281
            } else if ($attemptscount > 0 && !$lesson->retake) {
282
                // The user finished the lesson and no retakes are allowed.
283
                $error = ["noretake" => null];
284
                if (!$return) {
285
                    throw new moodle_exception(key($error), 'lesson');
286
                }
287
                $errors[key($error)] = current($error);
288
            }
289
        } else {
290
            if (!$timers = $lesson->get_user_timers($USER->id, 'starttime DESC', '*', 0, 1)) {
291
                $error = ["cannotfindtimer" => null];
292
                if (!$return) {
293
                    throw new moodle_exception(key($error), 'lesson');
294
                }
295
                $errors[key($error)] = current($error);
296
            } else {
297
                $timer = current($timers);
298
                if (!$lesson->check_time($timer)) {
299
                    $error = ["eolstudentoutoftime" => null];
300
                    if (!$return) {
301
                        throw new moodle_exception(key($error), 'lesson');
302
                    }
303
                    $errors[key($error)] = current($error);
304
                }
305
 
306
                // Check if the user want to review an attempt he just finished.
307
                if (!empty($params['review'])) {
308
                    // Allow review only for attempts during active session time.
309
                    if ($timer->lessontime + $CFG->sessiontimeout > time()) {
310
                        $ntries = $lesson->count_user_retries($USER->id);
311
                        $ntries--;  // Need to look at the old attempts.
312
                        if ($params['pageid'] == LESSON_EOL) {
313
                            if ($attempts = $lesson->get_attempts($ntries)) {
314
                                $lastattempt = end($attempts);
315
                                $USER->modattempts[$lesson->id] = $lastattempt->pageid;
316
                            }
317
                        } else {
318
                            if ($attempts = $lesson->get_attempts($ntries, false, $params['pageid'])) {
319
                                $lastattempt = end($attempts);
320
                                $USER->modattempts[$lesson->id] = $lastattempt;
321
                            }
322
                        }
323
                    }
324
 
325
                    if (!isset($USER->modattempts[$lesson->id])) {
326
                        $error = ["studentoutoftimeforreview" => null];
327
                        if (!$return) {
328
                            throw new moodle_exception(key($error), 'lesson');
329
                        }
330
                        $errors[key($error)] = current($error);
331
                    }
332
                }
333
            }
334
        }
335
 
336
        return $errors;
337
    }
338
 
339
    /**
340
     * Describes the parameters for get_lesson_access_information.
341
     *
342
     * @return external_function_parameters
343
     * @since Moodle 3.3
344
     */
345
    public static function get_lesson_access_information_parameters() {
346
        return new external_function_parameters (
347
            array(
348
                'lessonid' => new external_value(PARAM_INT, 'lesson instance id')
349
            )
350
        );
351
    }
352
 
353
    /**
354
     * Return access information for a given lesson.
355
     *
356
     * @param int $lessonid lesson instance id
357
     * @return array of warnings and the access information
358
     * @since Moodle 3.3
359
     * @throws  moodle_exception
360
     */
361
    public static function get_lesson_access_information($lessonid) {
362
        global $DB, $USER;
363
 
364
        $warnings = array();
365
 
366
        $params = array(
367
            'lessonid' => $lessonid
368
        );
369
        $params = self::validate_parameters(self::get_lesson_access_information_parameters(), $params);
370
 
371
        list($lesson, $course, $cm, $context, $lessonrecord) = self::validate_lesson($params['lessonid']);
372
 
373
        $result = array();
374
        // Capabilities first.
375
        $result['canmanage'] = $lesson->can_manage();
376
        $result['cangrade'] = has_capability('mod/lesson:grade', $context);
377
        $result['canviewreports'] = has_capability('mod/lesson:viewreports', $context);
378
 
379
        // Status information.
380
        $result['reviewmode'] = $lesson->is_in_review_mode();
381
        $result['attemptscount'] = $lesson->count_user_retries($USER->id);
382
        $lastpageseen = $lesson->get_last_page_seen($result['attemptscount']);
383
        $result['lastpageseen'] = ($lastpageseen !== false) ? $lastpageseen : 0;
384
        $result['leftduringtimedsession'] = $lesson->left_during_timed_session($result['attemptscount']);
385
        // To avoid multiple calls, store the magic property firstpage.
386
        $lessonfirstpage = $lesson->firstpage;
387
        $result['firstpageid'] = $lessonfirstpage ? $lessonfirstpage->id : 0;
388
 
389
        // Access restrictions now, we emulate a new attempt access to get the possible warnings.
390
        $result['preventaccessreasons'] = [];
391
        $validationerrors = self::validate_attempt($lesson, ['password' => ''], true);
392
        foreach ($validationerrors as $reason => $data) {
393
            $result['preventaccessreasons'][] = [
394
                'reason' => $reason,
395
                'data' => $data,
396
                'message' => get_string($reason, 'lesson', $data),
397
            ];
398
        }
399
        $result['warnings'] = $warnings;
400
        return $result;
401
    }
402
 
403
    /**
404
     * Describes the get_lesson_access_information return value.
405
     *
406
     * @return external_single_structure
407
     * @since Moodle 3.3
408
     */
409
    public static function get_lesson_access_information_returns() {
410
        return new external_single_structure(
411
            array(
412
                'canmanage' => new external_value(PARAM_BOOL, 'Whether the user can manage the lesson or not.'),
413
                'cangrade' => new external_value(PARAM_BOOL, 'Whether the user can grade the lesson or not.'),
414
                'canviewreports' => new external_value(PARAM_BOOL, 'Whether the user can view the lesson reports or not.'),
415
                'reviewmode' => new external_value(PARAM_BOOL, 'Whether the lesson is in review mode for the current user.'),
416
                'attemptscount' => new external_value(PARAM_INT, 'The number of attempts done by the user.'),
417
                'lastpageseen' => new external_value(PARAM_INT, 'The last page seen id.'),
418
                'leftduringtimedsession' => new external_value(PARAM_BOOL, 'Whether the user left during a timed session.'),
419
                'firstpageid' => new external_value(PARAM_INT, 'The lesson first page id.'),
420
                'preventaccessreasons' => new external_multiple_structure(
421
                    new external_single_structure(
422
                        array(
423
                            'reason' => new external_value(PARAM_ALPHANUMEXT, 'Reason lang string code'),
424
                            'data' => new external_value(PARAM_RAW, 'Additional data'),
425
                            'message' => new external_value(PARAM_RAW, 'Complete html message'),
426
                        ),
427
                        'The reasons why the user cannot attempt the lesson'
428
                    )
429
                ),
430
                'warnings' => new external_warnings(),
431
            )
432
        );
433
    }
434
 
435
    /**
436
     * Describes the parameters for view_lesson.
437
     *
438
     * @return external_function_parameters
439
     * @since Moodle 3.3
440
     */
441
    public static function view_lesson_parameters() {
442
        return new external_function_parameters (
443
            array(
444
                'lessonid' => new external_value(PARAM_INT, 'lesson instance id'),
445
                'password' => new external_value(PARAM_RAW, 'lesson password', VALUE_DEFAULT, ''),
446
            )
447
        );
448
    }
449
 
450
    /**
451
     * Trigger the course module viewed event and update the module completion status.
452
     *
453
     * @param int $lessonid lesson instance id
454
     * @param string $password optional password (the lesson may be protected)
455
     * @return array of warnings and status result
456
     * @since Moodle 3.3
457
     * @throws moodle_exception
458
     */
459
    public static function view_lesson($lessonid, $password = '') {
460
        global $DB;
461
 
462
        $params = array('lessonid' => $lessonid, 'password' => $password);
463
        $params = self::validate_parameters(self::view_lesson_parameters(), $params);
464
        $warnings = array();
465
 
466
        list($lesson, $course, $cm, $context, $lessonrecord) = self::validate_lesson($params['lessonid']);
467
        self::validate_attempt($lesson, $params);
468
 
469
        $lesson->set_module_viewed();
470
 
471
        $result = array();
472
        $result['status'] = true;
473
        $result['warnings'] = $warnings;
474
        return $result;
475
    }
476
 
477
    /**
478
     * Describes the view_lesson return value.
479
     *
480
     * @return external_single_structure
481
     * @since Moodle 3.3
482
     */
483
    public static function view_lesson_returns() {
484
        return new external_single_structure(
485
            array(
486
                'status' => new external_value(PARAM_BOOL, 'status: true if success'),
487
                'warnings' => new external_warnings(),
488
            )
489
        );
490
    }
491
 
492
    /**
493
     * Check if the current user can retrieve lesson information (grades, attempts) about the given user.
494
     *
495
     * @param int $userid the user to check
496
     * @param stdClass $course course object
497
     * @param stdClass $cm cm object
498
     * @param stdClass $context context object
499
     * @throws moodle_exception
500
     * @since Moodle 3.3
501
     */
502
    protected static function check_can_view_user_data($userid, $course, $cm, $context) {
503
        $user = core_user::get_user($userid, '*', MUST_EXIST);
504
        core_user::require_active_user($user);
505
        // Check permissions and that if users share group (if groups enabled).
506
        require_capability('mod/lesson:viewreports', $context);
507
        if (!groups_user_groups_visible($course, $user->id, $cm)) {
508
            throw new moodle_exception('notingroup');
509
        }
510
    }
511
 
512
    /**
513
     * Describes the parameters for get_questions_attempts.
514
     *
515
     * @return external_function_parameters
516
     * @since Moodle 3.3
517
     */
518
    public static function get_questions_attempts_parameters() {
519
        return new external_function_parameters (
520
            array(
521
                'lessonid' => new external_value(PARAM_INT, 'lesson instance id'),
522
                'attempt' => new external_value(PARAM_INT, 'lesson attempt number'),
523
                'correct' => new external_value(PARAM_BOOL, 'only fetch correct attempts', VALUE_DEFAULT, false),
524
                'pageid' => new external_value(PARAM_INT, 'only fetch attempts at the given page', VALUE_DEFAULT, null),
525
                'userid' => new external_value(PARAM_INT, 'only fetch attempts of the given user', VALUE_DEFAULT, null),
526
            )
527
        );
528
    }
529
 
530
    /**
531
     * Return the list of page question attempts in a given lesson.
532
     *
533
     * @param int $lessonid lesson instance id
534
     * @param int $attempt the lesson attempt number
535
     * @param bool $correct only fetch correct attempts
536
     * @param int $pageid only fetch attempts at the given page
537
     * @param int $userid only fetch attempts of the given user
538
     * @return array of warnings and page attempts
539
     * @since Moodle 3.3
540
     * @throws moodle_exception
541
     */
542
    public static function get_questions_attempts($lessonid, $attempt, $correct = false, $pageid = null, $userid = null) {
543
        global $DB, $USER;
544
 
545
        $params = array(
546
            'lessonid' => $lessonid,
547
            'attempt' => $attempt,
548
            'correct' => $correct,
549
            'pageid' => $pageid,
550
            'userid' => $userid,
551
        );
552
        $params = self::validate_parameters(self::get_questions_attempts_parameters(), $params);
553
        $warnings = array();
554
 
555
        list($lesson, $course, $cm, $context, $lessonrecord) = self::validate_lesson($params['lessonid']);
556
 
557
        // Default value for userid.
558
        if (empty($params['userid'])) {
559
            $params['userid'] = $USER->id;
560
        }
561
 
562
        // Extra checks so only users with permissions can view other users attempts.
563
        if ($USER->id != $params['userid']) {
564
            self::check_can_view_user_data($params['userid'], $course, $cm, $context);
565
        }
566
 
567
        $result = array();
568
        $result['attempts'] = $lesson->get_attempts($params['attempt'], $params['correct'], $params['pageid'], $params['userid']);
569
        $result['warnings'] = $warnings;
570
        return $result;
571
    }
572
 
573
    /**
574
     * Describes the get_questions_attempts return value.
575
     *
576
     * @return external_single_structure
577
     * @since Moodle 3.3
578
     */
579
    public static function get_questions_attempts_returns() {
580
        return new external_single_structure(
581
            array(
582
                'attempts' => new external_multiple_structure(
583
                    new external_single_structure(
584
                        array(
585
                            'id' => new external_value(PARAM_INT, 'The attempt id'),
586
                            'lessonid' => new external_value(PARAM_INT, 'The attempt lessonid'),
587
                            'pageid' => new external_value(PARAM_INT, 'The attempt pageid'),
588
                            'userid' => new external_value(PARAM_INT, 'The user who did the attempt'),
589
                            'answerid' => new external_value(PARAM_INT, 'The attempt answerid'),
590
                            'retry' => new external_value(PARAM_INT, 'The lesson attempt number'),
591
                            'correct' => new external_value(PARAM_INT, 'If it was the correct answer'),
592
                            'useranswer' => new external_value(PARAM_RAW, 'The complete user answer'),
593
                            'timeseen' => new external_value(PARAM_INT, 'The time the question was seen'),
594
                        ),
595
                        'The question page attempts'
596
                    )
597
                ),
598
                'warnings' => new external_warnings(),
599
            )
600
        );
601
    }
602
 
603
    /**
604
     * Describes the parameters for get_user_grade.
605
     *
606
     * @return external_function_parameters
607
     * @since Moodle 3.3
608
     */
609
    public static function get_user_grade_parameters() {
610
        return new external_function_parameters (
611
            array(
612
                'lessonid' => new external_value(PARAM_INT, 'lesson instance id'),
613
                'userid' => new external_value(PARAM_INT, 'the user id (empty for current user)', VALUE_DEFAULT, null),
614
            )
615
        );
616
    }
617
 
618
    /**
619
     * Return the final grade in the lesson for the given user.
620
     *
621
     * @param int $lessonid lesson instance id
622
     * @param int $userid only fetch grades of this user
623
     * @return array of warnings and page attempts
624
     * @since Moodle 3.3
625
     * @throws moodle_exception
626
     */
627
    public static function get_user_grade($lessonid, $userid = null) {
628
        global $CFG, $USER;
629
        require_once($CFG->libdir . '/gradelib.php');
630
 
631
        $params = array(
632
            'lessonid' => $lessonid,
633
            'userid' => $userid,
634
        );
635
        $params = self::validate_parameters(self::get_user_grade_parameters(), $params);
636
        $warnings = array();
637
 
638
        list($lesson, $course, $cm, $context, $lessonrecord) = self::validate_lesson($params['lessonid']);
639
 
640
        // Default value for userid.
641
        if (empty($params['userid'])) {
642
            $params['userid'] = $USER->id;
643
        }
644
 
645
        // Extra checks so only users with permissions can view other users attempts.
646
        if ($USER->id != $params['userid']) {
647
            self::check_can_view_user_data($params['userid'], $course, $cm, $context);
648
        }
649
 
650
        $grade = null;
651
        $formattedgrade = null;
652
        $grades = lesson_get_user_grades($lesson, $params['userid']);
653
        if (!empty($grades)) {
654
            $grade = $grades[$params['userid']]->rawgrade;
655
            $params = array(
656
                'itemtype' => 'mod',
657
                'itemmodule' => 'lesson',
658
                'iteminstance' => $lesson->id,
659
                'courseid' => $course->id,
660
                'itemnumber' => 0
661
            );
662
            $gradeitem = grade_item::fetch($params);
663
            $formattedgrade = grade_format_gradevalue($grade, $gradeitem);
664
        }
665
 
666
        $result = array();
667
        $result['grade'] = $grade;
668
        $result['formattedgrade'] = $formattedgrade;
669
        $result['warnings'] = $warnings;
670
        return $result;
671
    }
672
 
673
    /**
674
     * Describes the get_user_grade return value.
675
     *
676
     * @return external_single_structure
677
     * @since Moodle 3.3
678
     */
679
    public static function get_user_grade_returns() {
680
        return new external_single_structure(
681
            array(
682
                'grade' => new external_value(PARAM_FLOAT, 'The lesson final raw grade'),
683
                'formattedgrade' => new external_value(PARAM_RAW, 'The lesson final grade formatted'),
684
                'warnings' => new external_warnings(),
685
            )
686
        );
687
    }
688
 
689
    /**
690
     * Describes an attempt grade structure.
691
     *
692
     * @param  int $required if the structure is required or optional
693
     * @return external_single_structure the structure
694
     * @since  Moodle 3.3
695
     */
696
    protected static function get_user_attempt_grade_structure($required = VALUE_REQUIRED) {
697
        $data = array(
698
            'nquestions' => new external_value(PARAM_INT, 'Number of questions answered'),
699
            'attempts' => new external_value(PARAM_INT, 'Number of question attempts'),
700
            'total' => new external_value(PARAM_FLOAT, 'Max points possible'),
701
            'earned' => new external_value(PARAM_FLOAT, 'Points earned by student'),
702
            'grade' => new external_value(PARAM_FLOAT, 'Calculated percentage grade'),
703
            'nmanual' => new external_value(PARAM_INT, 'Number of manually graded questions'),
704
            'manualpoints' => new external_value(PARAM_FLOAT, 'Point value for manually graded questions'),
705
        );
706
        return new external_single_structure(
707
            $data, 'Attempt grade', $required
708
        );
709
    }
710
 
711
    /**
712
     * Describes the parameters for get_user_attempt_grade.
713
     *
714
     * @return external_function_parameters
715
     * @since Moodle 3.3
716
     */
717
    public static function get_user_attempt_grade_parameters() {
718
        return new external_function_parameters (
719
            array(
720
                'lessonid' => new external_value(PARAM_INT, 'lesson instance id'),
721
                'lessonattempt' => new external_value(PARAM_INT, 'lesson attempt number'),
722
                'userid' => new external_value(PARAM_INT, 'the user id (empty for current user)', VALUE_DEFAULT, null),
723
            )
724
        );
725
    }
726
 
727
    /**
728
     * Return grade information in the attempt for a given user.
729
     *
730
     * @param int $lessonid lesson instance id
731
     * @param int $lessonattempt lesson attempt number
732
     * @param int $userid only fetch attempts of the given user
733
     * @return array of warnings and page attempts
734
     * @since Moodle 3.3
735
     * @throws moodle_exception
736
     */
737
    public static function get_user_attempt_grade($lessonid, $lessonattempt, $userid = null) {
738
        global $CFG, $USER;
739
        require_once($CFG->libdir . '/gradelib.php');
740
 
741
        $params = array(
742
            'lessonid' => $lessonid,
743
            'lessonattempt' => $lessonattempt,
744
            'userid' => $userid,
745
        );
746
        $params = self::validate_parameters(self::get_user_attempt_grade_parameters(), $params);
747
        $warnings = array();
748
 
749
        list($lesson, $course, $cm, $context, $lessonrecord) = self::validate_lesson($params['lessonid']);
750
 
751
        // Default value for userid.
752
        if (empty($params['userid'])) {
753
            $params['userid'] = $USER->id;
754
        }
755
 
756
        // Extra checks so only users with permissions can view other users attempts.
757
        if ($USER->id != $params['userid']) {
758
            self::check_can_view_user_data($params['userid'], $course, $cm, $context);
759
        }
760
 
761
        $result = array();
762
        $result['grade'] = (array) lesson_grade($lesson, $params['lessonattempt'], $params['userid']);
763
        $result['warnings'] = $warnings;
764
        return $result;
765
    }
766
 
767
    /**
768
     * Describes the get_user_attempt_grade return value.
769
     *
770
     * @return external_single_structure
771
     * @since Moodle 3.3
772
     */
773
    public static function get_user_attempt_grade_returns() {
774
        return new external_single_structure(
775
            array(
776
                'grade' => self::get_user_attempt_grade_structure(),
777
                'warnings' => new external_warnings(),
778
            )
779
        );
780
    }
781
 
782
    /**
783
     * Describes the parameters for get_content_pages_viewed.
784
     *
785
     * @return external_function_parameters
786
     * @since Moodle 3.3
787
     */
788
    public static function get_content_pages_viewed_parameters() {
789
        return new external_function_parameters (
790
            array(
791
                'lessonid' => new external_value(PARAM_INT, 'lesson instance id'),
792
                'lessonattempt' => new external_value(PARAM_INT, 'lesson attempt number'),
793
                'userid' => new external_value(PARAM_INT, 'the user id (empty for current user)', VALUE_DEFAULT, null),
794
            )
795
        );
796
    }
797
 
798
    /**
799
     * Return the list of content pages viewed by a user during a lesson attempt.
800
     *
801
     * @param int $lessonid lesson instance id
802
     * @param int $lessonattempt lesson attempt number
803
     * @param int $userid only fetch attempts of the given user
804
     * @return array of warnings and page attempts
805
     * @since Moodle 3.3
806
     * @throws moodle_exception
807
     */
808
    public static function get_content_pages_viewed($lessonid, $lessonattempt, $userid = null) {
809
        global $USER;
810
 
811
        $params = array(
812
            'lessonid' => $lessonid,
813
            'lessonattempt' => $lessonattempt,
814
            'userid' => $userid,
815
        );
816
        $params = self::validate_parameters(self::get_content_pages_viewed_parameters(), $params);
817
        $warnings = array();
818
 
819
        list($lesson, $course, $cm, $context, $lessonrecord) = self::validate_lesson($params['lessonid']);
820
 
821
        // Default value for userid.
822
        if (empty($params['userid'])) {
823
            $params['userid'] = $USER->id;
824
        }
825
 
826
        // Extra checks so only users with permissions can view other users attempts.
827
        if ($USER->id != $params['userid']) {
828
            self::check_can_view_user_data($params['userid'], $course, $cm, $context);
829
        }
830
 
831
        $pages = $lesson->get_content_pages_viewed($params['lessonattempt'], $params['userid']);
832
 
833
        $result = array();
834
        $result['pages'] = $pages;
835
        $result['warnings'] = $warnings;
836
        return $result;
837
    }
838
 
839
    /**
840
     * Describes the get_content_pages_viewed return value.
841
     *
842
     * @return external_single_structure
843
     * @since Moodle 3.3
844
     */
845
    public static function get_content_pages_viewed_returns() {
846
        return new external_single_structure(
847
            array(
848
                'pages' => new external_multiple_structure(
849
                    new external_single_structure(
850
                        array(
851
                            'id' => new external_value(PARAM_INT, 'The attempt id.'),
852
                            'lessonid' => new external_value(PARAM_INT, 'The lesson id.'),
853
                            'pageid' => new external_value(PARAM_INT, 'The page id.'),
854
                            'userid' => new external_value(PARAM_INT, 'The user who viewed the page.'),
855
                            'retry' => new external_value(PARAM_INT, 'The lesson attempt number.'),
856
                            'flag' => new external_value(PARAM_INT, '1 if the next page was calculated randomly.'),
857
                            'timeseen' => new external_value(PARAM_INT, 'The time the page was seen.'),
858
                            'nextpageid' => new external_value(PARAM_INT, 'The next page chosen id.'),
859
                        ),
860
                        'The content pages viewed.'
861
                    )
862
                ),
863
                'warnings' => new external_warnings(),
864
            )
865
        );
866
    }
867
 
868
    /**
869
     * Describes the parameters for get_user_timers.
870
     *
871
     * @return external_function_parameters
872
     * @since Moodle 3.3
873
     */
874
    public static function get_user_timers_parameters() {
875
        return new external_function_parameters (
876
            array(
877
                'lessonid' => new external_value(PARAM_INT, 'lesson instance id'),
878
                'userid' => new external_value(PARAM_INT, 'the user id (empty for current user)', VALUE_DEFAULT, null),
879
            )
880
        );
881
    }
882
 
883
    /**
884
     * Return the timers in the current lesson for the given user.
885
     *
886
     * @param int $lessonid lesson instance id
887
     * @param int $userid only fetch timers of the given user
888
     * @return array of warnings and timers
889
     * @since Moodle 3.3
890
     * @throws moodle_exception
891
     */
892
    public static function get_user_timers($lessonid, $userid = null) {
893
        global $USER;
894
 
895
        $params = array(
896
            'lessonid' => $lessonid,
897
            'userid' => $userid,
898
        );
899
        $params = self::validate_parameters(self::get_user_timers_parameters(), $params);
900
        $warnings = array();
901
 
902
        list($lesson, $course, $cm, $context, $lessonrecord) = self::validate_lesson($params['lessonid']);
903
 
904
        // Default value for userid.
905
        if (empty($params['userid'])) {
906
            $params['userid'] = $USER->id;
907
        }
908
 
909
        // Extra checks so only users with permissions can view other users attempts.
910
        if ($USER->id != $params['userid']) {
911
            self::check_can_view_user_data($params['userid'], $course, $cm, $context);
912
        }
913
 
914
        $timers = $lesson->get_user_timers($params['userid']);
915
 
916
        $result = array();
917
        $result['timers'] = $timers;
918
        $result['warnings'] = $warnings;
919
        return $result;
920
    }
921
 
922
    /**
923
     * Describes the get_user_timers return value.
924
     *
925
     * @return external_single_structure
926
     * @since Moodle 3.3
927
     */
928
    public static function get_user_timers_returns() {
929
        return new external_single_structure(
930
            array(
931
                'timers' => new external_multiple_structure(
932
                    new external_single_structure(
933
                        array(
934
                            'id' => new external_value(PARAM_INT, 'The attempt id'),
935
                            'lessonid' => new external_value(PARAM_INT, 'The lesson id'),
936
                            'userid' => new external_value(PARAM_INT, 'The user id'),
937
                            'starttime' => new external_value(PARAM_INT, 'First access time for a new timer session'),
938
                            'lessontime' => new external_value(PARAM_INT, 'Last access time to the lesson during the timer session'),
939
                            'completed' => new external_value(PARAM_INT, 'If the lesson for this timer was completed'),
940
                            'timemodifiedoffline' => new external_value(PARAM_INT, 'Last modified time via webservices.'),
941
                        ),
942
                        'The timers'
943
                    )
944
                ),
945
                'warnings' => new external_warnings(),
946
            )
947
        );
948
    }
949
 
950
    /**
951
     * Describes the external structure for a lesson page.
952
     *
953
     * @return external_single_structure
954
     * @since Moodle 3.3
955
     */
956
    protected static function get_page_structure($required = VALUE_REQUIRED) {
957
        return new external_single_structure(
958
            array(
959
                'id' => new external_value(PARAM_INT, 'The id of this lesson page'),
960
                'lessonid' => new external_value(PARAM_INT, 'The id of the lesson this page belongs to'),
961
                'prevpageid' => new external_value(PARAM_INT, 'The id of the page before this one'),
962
                'nextpageid' => new external_value(PARAM_INT, 'The id of the next page in the page sequence'),
963
                'qtype' => new external_value(PARAM_INT, 'Identifies the page type of this page'),
964
                'qoption' => new external_value(PARAM_INT, 'Used to record page type specific options'),
965
                'layout' => new external_value(PARAM_INT, 'Used to record page specific layout selections'),
966
                'display' => new external_value(PARAM_INT, 'Used to record page specific display selections'),
967
                'timecreated' => new external_value(PARAM_INT, 'Timestamp for when the page was created'),
968
                'timemodified' => new external_value(PARAM_INT, 'Timestamp for when the page was last modified'),
969
                'title' => new external_value(PARAM_RAW, 'The title of this page', VALUE_OPTIONAL),
970
                'contents' => new external_value(PARAM_RAW, 'The contents of this page', VALUE_OPTIONAL),
971
                'contentsformat' => new external_format_value('contents', VALUE_OPTIONAL),
972
                'displayinmenublock' => new external_value(PARAM_BOOL, 'Toggles display in the left menu block'),
973
                'type' => new external_value(PARAM_INT, 'The type of the page [question | structure]'),
974
                'typeid' => new external_value(PARAM_INT, 'The unique identifier for the page type'),
975
                'typestring' => new external_value(PARAM_RAW, 'The string that describes this page type'),
976
            ),
977
            'Page fields', $required
978
        );
979
    }
980
 
981
    /**
982
     * Returns the fields of a page object
983
     * @param lesson_page $page the lesson page
984
     * @param bool $returncontents whether to return the page title and contents
985
     * @return stdClass          the fields matching the external page structure
986
     * @since Moodle 3.3
987
     */
988
    protected static function get_page_fields(lesson_page $page, $returncontents = false) {
989
        $lesson = $page->lesson;
990
        $context = $lesson->context;
991
 
992
        $pagedata = new stdClass; // Contains the data that will be returned by the WS.
993
 
994
        // Return the visible data.
995
        $visibleproperties = array('id', 'lessonid', 'prevpageid', 'nextpageid', 'qtype', 'qoption', 'layout', 'display',
996
                                    'displayinmenublock', 'type', 'typeid', 'typestring', 'timecreated', 'timemodified');
997
        foreach ($visibleproperties as $prop) {
998
            $pagedata->{$prop} = $page->{$prop};
999
        }
1000
 
1001
        // Check if we can see title (contents required custom rendering, we won't returning it here @see get_page_data).
1002
        $canmanage = $lesson->can_manage();
1003
        // If we are managers or the menu block is enabled and is a content page visible always return contents.
1004
        if ($returncontents || $canmanage || (lesson_displayleftif($lesson) && $page->displayinmenublock && $page->display)) {
1005
            $pagedata->title = \core_external\util::format_string($page->title, $context);
1006
 
1007
            $options = array('noclean' => true);
1008
            [$pagedata->contents, $pagedata->contentsformat] = \core_external\util::format_text(
1009
                $page->contents,
1010
                $page->contentsformat,
1011
                $context,
1012
                'mod_lesson',
1013
                'page_contents',
1014
                $page->id,
1015
                $options
1016
            );
1017
        }
1018
        return $pagedata;
1019
    }
1020
 
1021
    /**
1022
     * Describes the parameters for get_pages.
1023
     *
1024
     * @return external_function_parameters
1025
     * @since Moodle 3.3
1026
     */
1027
    public static function get_pages_parameters() {
1028
        return new external_function_parameters (
1029
            array(
1030
                'lessonid' => new external_value(PARAM_INT, 'lesson instance id'),
1031
                'password' => new external_value(PARAM_RAW, 'optional password (the lesson may be protected)', VALUE_DEFAULT, ''),
1032
            )
1033
        );
1034
    }
1035
 
1036
    /**
1037
     * Return the list of pages in a lesson (based on the user permissions).
1038
     *
1039
     * @param int $lessonid lesson instance id
1040
     * @param string $password optional password (the lesson may be protected)
1041
     * @return array of warnings and status result
1042
     * @since Moodle 3.3
1043
     * @throws moodle_exception
1044
     */
1045
    public static function get_pages($lessonid, $password = '') {
1046
 
1047
        $params = array('lessonid' => $lessonid, 'password' => $password);
1048
        $params = self::validate_parameters(self::get_pages_parameters(), $params);
1049
        $warnings = array();
1050
 
1051
        list($lesson, $course, $cm, $context, $lessonrecord) = self::validate_lesson($params['lessonid']);
1052
        self::validate_attempt($lesson, $params);
1053
 
1054
        $lessonpages = $lesson->load_all_pages();
1055
        $pages = array();
1056
 
1057
        foreach ($lessonpages as $page) {
1058
            $pagedata = new stdClass();
1059
 
1060
            // Get the page object fields.
1061
            $pagedata->page = self::get_page_fields($page);
1062
 
1063
            // Now, calculate the file area files (maybe we need to download a lesson for offline usage).
1064
            $pagedata->filescount = 0;
1065
            $pagedata->filessizetotal = 0;
1066
            $files = $page->get_files(false);   // Get files excluding directories.
1067
            foreach ($files as $file) {
1068
                $pagedata->filescount++;
1069
                $pagedata->filessizetotal += $file->get_filesize();
1070
            }
1071
 
1072
            // Now the possible answers and page jumps ids.
1073
            $pagedata->answerids = array();
1074
            $pagedata->jumps = array();
1075
            $answers = $page->get_answers();
1076
            foreach ($answers as $answer) {
1077
                $pagedata->answerids[] = $answer->id;
1078
                $pagedata->jumps[] = $answer->jumpto;
1079
                $files = $answer->get_files(false);   // Get files excluding directories.
1080
                foreach ($files as $file) {
1081
                    $pagedata->filescount++;
1082
                    $pagedata->filessizetotal += $file->get_filesize();
1083
                }
1084
            }
1085
            $pages[] = $pagedata;
1086
        }
1087
 
1088
        $result = array();
1089
        $result['pages'] = $pages;
1090
        $result['warnings'] = $warnings;
1091
        return $result;
1092
    }
1093
 
1094
    /**
1095
     * Describes the get_pages return value.
1096
     *
1097
     * @return external_single_structure
1098
     * @since Moodle 3.3
1099
     */
1100
    public static function get_pages_returns() {
1101
        return new external_single_structure(
1102
            array(
1103
                'pages' => new external_multiple_structure(
1104
                    new external_single_structure(
1105
                        array(
1106
                            'page' => self::get_page_structure(),
1107
                            'answerids' => new external_multiple_structure(
1108
                                new external_value(PARAM_INT, 'Answer id'), 'List of answers ids (empty for content pages in  Moodle 1.9)'
1109
                            ),
1110
                            'jumps' => new external_multiple_structure(
1111
                                new external_value(PARAM_INT, 'Page to jump id'), 'List of possible page jumps'
1112
                            ),
1113
                            'filescount' => new external_value(PARAM_INT, 'The total number of files attached to the page'),
1114
                            'filessizetotal' => new external_value(PARAM_INT, 'The total size of the files'),
1115
                        ),
1116
                        'The lesson pages'
1117
                    )
1118
                ),
1119
                'warnings' => new external_warnings(),
1120
            )
1121
        );
1122
    }
1123
 
1124
    /**
1125
     * Describes the parameters for launch_attempt.
1126
     *
1127
     * @return external_function_parameters
1128
     * @since Moodle 3.3
1129
     */
1130
    public static function launch_attempt_parameters() {
1131
        return new external_function_parameters (
1132
            array(
1133
                'lessonid' => new external_value(PARAM_INT, 'lesson instance id'),
1134
                'password' => new external_value(PARAM_RAW, 'optional password (the lesson may be protected)', VALUE_DEFAULT, ''),
1135
                'pageid' => new external_value(PARAM_INT, 'page id to continue from (only when continuing an attempt)', VALUE_DEFAULT, 0),
1136
                'review' => new external_value(PARAM_BOOL, 'if we want to review just after finishing', VALUE_DEFAULT, false),
1137
            )
1138
        );
1139
    }
1140
 
1141
    /**
1142
     * Return lesson messages formatted according the external_messages structure
1143
     *
1144
     * @param  lesson $lesson lesson instance
1145
     * @return array          messages formatted
1146
     * @since Moodle 3.3
1147
     */
1148
    protected static function format_lesson_messages($lesson) {
1149
        $messages = array();
1150
        foreach ($lesson->messages as $message) {
1151
            $messages[] = array(
1152
                'message' => $message[0],
1153
                'type' => $message[1],
1154
            );
1155
        }
1156
        return $messages;
1157
    }
1158
 
1159
    /**
1160
     * Return a external structure representing messages.
1161
     *
1162
     * @return external_multiple_structure messages structure
1163
     * @since Moodle 3.3
1164
     */
1165
    protected static function external_messages() {
1166
        return new external_multiple_structure(
1167
            new external_single_structure(
1168
                array(
1169
                    'message' => new external_value(PARAM_RAW, 'Message.'),
1170
                    'type' => new external_value(PARAM_ALPHANUMEXT, 'Message type: usually a CSS identifier like:
1171
                                success, info, warning, error, notifyproblem, notifyerror, notifytiny, notifysuccess')
1172
                ), 'The lesson generated messages'
1173
            )
1174
        );
1175
    }
1176
 
1177
    /**
1178
     * Starts a new attempt or continues an existing one.
1179
     *
1180
     * @param int $lessonid lesson instance id
1181
     * @param string $password optional password (the lesson may be protected)
1182
     * @param int $pageid page id to continue from (only when continuing an attempt)
1183
     * @param bool $review if we want to review just after finishing
1184
     * @return array of warnings and status result
1185
     * @since Moodle 3.3
1186
     * @throws moodle_exception
1187
     */
1188
    public static function launch_attempt($lessonid, $password = '', $pageid = 0, $review = false) {
1189
        global $CFG, $USER;
1190
 
1191
        $params = array('lessonid' => $lessonid, 'password' => $password, 'pageid' => $pageid, 'review' => $review);
1192
        $params = self::validate_parameters(self::launch_attempt_parameters(), $params);
1193
        $warnings = array();
1194
 
1195
        list($lesson, $course, $cm, $context, $lessonrecord) = self::validate_lesson($params['lessonid']);
1196
        self::validate_attempt($lesson, $params);
1197
 
1198
        $newpageid = 0;
1199
        // Starting a new lesson attempt.
1200
        if (empty($params['pageid'])) {
1201
            // Check if there is a recent timer created during the active session.
1202
            $alreadystarted = false;
1203
            if ($timers = $lesson->get_user_timers($USER->id, 'starttime DESC', '*', 0, 1)) {
1204
                $timer = array_shift($timers);
1205
                $endtime = $lesson->timelimit > 0 ? min($CFG->sessiontimeout, $lesson->timelimit) : $CFG->sessiontimeout;
1206
                if (!$timer->completed && $timer->starttime > time() - $endtime) {
1207
                    $alreadystarted = true;
1208
                }
1209
            }
1210
            if (!$alreadystarted && !$lesson->can_manage()) {
1211
                $lesson->start_timer();
1212
            }
1213
        } else {
1214
            if ($params['pageid'] == LESSON_EOL) {
1215
                throw new moodle_exception('endoflesson', 'lesson');
1216
            }
1217
            $timer = $lesson->update_timer(true, true);
1218
            if (!$lesson->check_time($timer)) {
1219
                throw new moodle_exception('eolstudentoutoftime', 'lesson');
1220
            }
1221
        }
1222
        $messages = self::format_lesson_messages($lesson);
1223
 
1224
        $result = array(
1225
            'status' => true,
1226
            'messages' => $messages,
1227
            'warnings' => $warnings,
1228
        );
1229
        return $result;
1230
    }
1231
 
1232
    /**
1233
     * Describes the launch_attempt return value.
1234
     *
1235
     * @return external_single_structure
1236
     * @since Moodle 3.3
1237
     */
1238
    public static function launch_attempt_returns() {
1239
        return new external_single_structure(
1240
            array(
1241
                'messages' => self::external_messages(),
1242
                'warnings' => new external_warnings(),
1243
            )
1244
        );
1245
    }
1246
 
1247
    /**
1248
     * Describes the parameters for get_page_data.
1249
     *
1250
     * @return external_function_parameters
1251
     * @since Moodle 3.3
1252
     */
1253
    public static function get_page_data_parameters() {
1254
        return new external_function_parameters (
1255
            array(
1256
                'lessonid' => new external_value(PARAM_INT, 'lesson instance id'),
1257
                'pageid' => new external_value(PARAM_INT, 'the page id'),
1258
                'password' => new external_value(PARAM_RAW, 'optional password (the lesson may be protected)', VALUE_DEFAULT, ''),
1259
                'review' => new external_value(PARAM_BOOL, 'if we want to review just after finishing (1 hour margin)',
1260
                    VALUE_DEFAULT, false),
1261
                'returncontents' => new external_value(PARAM_BOOL, 'if we must return the complete page contents once rendered',
1262
                    VALUE_DEFAULT, false),
1263
            )
1264
        );
1265
    }
1266
 
1267
    /**
1268
     * Return information of a given page, including its contents.
1269
     *
1270
     * @param int $lessonid lesson instance id
1271
     * @param int $pageid page id
1272
     * @param string $password optional password (the lesson may be protected)
1273
     * @param bool $review if we want to review just after finishing (1 hour margin)
1274
     * @param bool $returncontents if we must return the complete page contents once rendered
1275
     * @return array of warnings and status result
1276
     * @since Moodle 3.3
1277
     * @throws moodle_exception
1278
     */
1279
    public static function get_page_data($lessonid, $pageid,  $password = '', $review = false, $returncontents = false) {
1280
        global $PAGE, $USER;
1281
 
1282
        $params = array('lessonid' => $lessonid, 'password' => $password, 'pageid' => $pageid, 'review' => $review,
1283
            'returncontents' => $returncontents);
1284
        $params = self::validate_parameters(self::get_page_data_parameters(), $params);
1285
 
1286
        $warnings = $contentfiles = $answerfiles = $responsefiles = $answers = array();
1287
        $pagecontent = $ongoingscore = '';
1288
        $progress = $pagedata = null;
1289
 
1290
        list($lesson, $course, $cm, $context, $lessonrecord) = self::validate_lesson($params['lessonid']);
1291
        self::validate_attempt($lesson, $params);
1292
 
1293
        $pageid = $params['pageid'];
1294
 
1295
        // This is called if a student leaves during a lesson.
1296
        if ($pageid == LESSON_UNSEENBRANCHPAGE) {
1297
            $pageid = lesson_unseen_question_jump($lesson, $USER->id, $pageid);
1298
        }
1299
 
1300
        if ($pageid != LESSON_EOL) {
1301
            $reviewmode = $lesson->is_in_review_mode();
1302
            $lessonoutput = $PAGE->get_renderer('mod_lesson');
1303
            // Prepare page contents avoiding redirections.
1304
            list($pageid, $page, $pagecontent) = $lesson->prepare_page_and_contents($pageid, $lessonoutput, $reviewmode, false);
1305
 
1306
            if ($pageid > 0) {
1307
 
1308
                $pagedata = self::get_page_fields($page, true);
1309
 
1310
                // Files.
1311
                $contentfiles = util::get_area_files($context->id, 'mod_lesson', 'page_contents', $page->id);
1312
 
1313
                // Answers.
1314
                $answers = array();
1315
                $pageanswers = $page->get_answers();
1316
                foreach ($pageanswers as $a) {
1317
                    $answer = array(
1318
                        'id' => $a->id,
1319
                        'answerfiles' => util::get_area_files($context->id, 'mod_lesson', 'page_answers', $a->id),
1320
                        'responsefiles' => util::get_area_files($context->id, 'mod_lesson', 'page_responses', $a->id),
1321
                    );
1322
                    // For managers, return all the information (including correct answers, jumps).
1323
                    // If the teacher enabled offline attempts, this information will be downloaded too.
1324
                    if ($lesson->can_manage() || $lesson->allowofflineattempts) {
1325
                        $extraproperties = array('jumpto', 'grade', 'score', 'flags', 'timecreated', 'timemodified');
1326
                        foreach ($extraproperties as $prop) {
1327
                            $answer[$prop] = $a->{$prop};
1328
                        }
1329
 
1330
                        $options = array('noclean' => true);
1331
                        [$answer['answer'], $answer['answerformat']] = \core_external\util::format_text(
1332
                            $a->answer,
1333
                            $a->answerformat,
1334
                            $context,
1335
                            'mod_lesson',
1336
                            'page_answers',
1337
                            $a->id,
1338
                            $options
1339
                        );
1340
                        [$answer['response'], $answer['responseformat']] = \core_external\util::format_text(
1341
                            $a->response,
1342
                            $a->responseformat,
1343
                            $context,
1344
                            'mod_lesson',
1345
                            'page_responses',
1346
                            $a->id,
1347
                            $options
1348
                        );
1349
                    }
1350
                    $answers[] = $answer;
1351
                }
1352
 
1353
                // Additional lesson information.
1354
                if (!$lesson->can_manage()) {
1355
                    if ($lesson->ongoing && !$reviewmode) {
1356
                        $ongoingscore = $lesson->get_ongoing_score_message();
1357
                    }
1358
                    if ($lesson->progressbar) {
1359
                        $progress = $lesson->calculate_progress();
1360
                    }
1361
                }
1362
            }
1363
        }
1364
 
1365
        $messages = self::format_lesson_messages($lesson);
1366
 
1367
        $result = array(
1368
            'newpageid' => $pageid,
1369
            'ongoingscore' => $ongoingscore,
1370
            'progress' => $progress,
1371
            'contentfiles' => $contentfiles,
1372
            'answers' => $answers,
1373
            'messages' => $messages,
1374
            'warnings' => $warnings,
1375
            'displaymenu' => !empty(lesson_displayleftif($lesson)),
1376
        );
1377
 
1378
        if (!empty($pagedata)) {
1379
            $result['page'] = $pagedata;
1380
        }
1381
        if ($params['returncontents']) {
1382
            $result['pagecontent'] = $pagecontent;  // Return the complete page contents rendered.
1383
        }
1384
 
1385
        return $result;
1386
    }
1387
 
1388
    /**
1389
     * Describes the get_page_data return value.
1390
     *
1391
     * @return external_single_structure
1392
     * @since Moodle 3.3
1393
     */
1394
    public static function get_page_data_returns() {
1395
        return new external_single_structure(
1396
            array(
1397
                'page' => self::get_page_structure(VALUE_OPTIONAL),
1398
                'newpageid' => new external_value(PARAM_INT, 'New page id (if a jump was made)'),
1399
                'pagecontent' => new external_value(PARAM_RAW, 'Page html content', VALUE_OPTIONAL),
1400
                'ongoingscore' => new external_value(PARAM_TEXT, 'The ongoing score message'),
1401
                'progress' => new external_value(PARAM_INT, 'Progress percentage in the lesson'),
1402
                'contentfiles' => new external_files(),
1403
                'answers' => new external_multiple_structure(
1404
                    new external_single_structure(
1405
                        array(
1406
                            'id' => new external_value(PARAM_INT, 'The ID of this answer in the database'),
1407
                            'answerfiles' => new external_files(),
1408
                            'responsefiles' => new external_files(),
1409
                            'jumpto' => new external_value(PARAM_INT, 'Identifies where the user goes upon completing a page with this answer',
1410
                                                            VALUE_OPTIONAL),
1411
                            'grade' => new external_value(PARAM_INT, 'The grade this answer is worth', VALUE_OPTIONAL),
1412
                            'score' => new external_value(PARAM_INT, 'The score this answer will give', VALUE_OPTIONAL),
1413
                            'flags' => new external_value(PARAM_INT, 'Used to store options for the answer', VALUE_OPTIONAL),
1414
                            'timecreated' => new external_value(PARAM_INT, 'A timestamp of when the answer was created', VALUE_OPTIONAL),
1415
                            'timemodified' => new external_value(PARAM_INT, 'A timestamp of when the answer was modified', VALUE_OPTIONAL),
1416
                            'answer' => new external_value(PARAM_RAW, 'Possible answer text', VALUE_OPTIONAL),
1417
                            'answerformat' => new external_format_value('answer', VALUE_OPTIONAL),
1418
                            'response' => new external_value(PARAM_RAW, 'Response text for the answer', VALUE_OPTIONAL),
1419
                            'responseformat' => new external_format_value('response', VALUE_OPTIONAL),
1420
                        ), 'The page answers'
1421
 
1422
                    )
1423
                ),
1424
                'messages' => self::external_messages(),
1425
                'displaymenu' => new external_value(PARAM_BOOL, 'Whether we should display the menu or not in this page.'),
1426
                'warnings' => new external_warnings(),
1427
            )
1428
        );
1429
    }
1430
 
1431
    /**
1432
     * Describes the parameters for process_page.
1433
     *
1434
     * @return external_function_parameters
1435
     * @since Moodle 3.3
1436
     */
1437
    public static function process_page_parameters() {
1438
        return new external_function_parameters (
1439
            array(
1440
                'lessonid' => new external_value(PARAM_INT, 'lesson instance id'),
1441
                'pageid' => new external_value(PARAM_INT, 'the page id'),
1442
                'data' => new external_multiple_structure(
1443
                    new external_single_structure(
1444
                        array(
1445
                            'name' => new external_value(PARAM_RAW, 'data name'),
1446
                            'value' => new external_value(PARAM_RAW, 'data value'),
1447
                        )
1448
                    ), 'the data to be saved'
1449
                ),
1450
                'password' => new external_value(PARAM_RAW, 'optional password (the lesson may be protected)', VALUE_DEFAULT, ''),
1451
                'review' => new external_value(PARAM_BOOL, 'if we want to review just after finishing (1 hour margin)',
1452
                    VALUE_DEFAULT, false),
1453
            )
1454
        );
1455
    }
1456
 
1457
    /**
1458
     * Processes page responses
1459
     *
1460
     * @param int $lessonid lesson instance id
1461
     * @param int $pageid page id
1462
     * @param array $data the data to be saved
1463
     * @param string $password optional password (the lesson may be protected)
1464
     * @param bool $review if we want to review just after finishing (1 hour margin)
1465
     * @return array of warnings and status result
1466
     * @since Moodle 3.3
1467
     * @throws moodle_exception
1468
     */
1469
    public static function process_page($lessonid, $pageid,  $data, $password = '', $review = false) {
1470
        global $USER;
1471
 
1472
        $params = array('lessonid' => $lessonid, 'pageid' => $pageid, 'data' => $data, 'password' => $password,
1473
            'review' => $review);
1474
        $params = self::validate_parameters(self::process_page_parameters(), $params);
1475
 
1476
        $warnings = array();
1477
        $pagecontent = $ongoingscore = '';
1478
        $progress = null;
1479
 
1480
        list($lesson, $course, $cm, $context, $lessonrecord) = self::validate_lesson($params['lessonid']);
1481
 
1482
        // Update timer so the validation can check the time restrictions.
1483
        $timer = $lesson->update_timer();
1484
        self::validate_attempt($lesson, $params);
1485
 
1486
        // Create the $_POST object required by the lesson question engine.
1487
        $_POST = array();
1488
        foreach ($data as $element) {
1489
            // First check if we are handling editor fields like answer[text].
1490
            if (preg_match('/(.+)\[(.+)\]$/', $element['name'], $matches)) {
1491
                $_POST[$matches[1]][$matches[2]] = $element['value'];
1492
            } else {
1493
                $_POST[$element['name']] = $element['value'];
1494
            }
1495
        }
1496
 
1497
        // Ignore sesskey (deep in some APIs), the request is already validated.
1498
        $USER->ignoresesskey = true;
1499
 
1500
        // Process page.
1501
        $page = $lesson->load_page($params['pageid']);
1502
        $result = $lesson->process_page_responses($page);
1503
 
1504
        // Prepare messages.
1505
        $reviewmode = $lesson->is_in_review_mode();
1506
        $lesson->add_messages_on_page_process($page, $result, $reviewmode);
1507
 
1508
        // Additional lesson information.
1509
        if (!$lesson->can_manage()) {
1510
            if ($lesson->ongoing && !$reviewmode) {
1511
                $ongoingscore = $lesson->get_ongoing_score_message();
1512
            }
1513
            if ($lesson->progressbar) {
1514
                $progress = $lesson->calculate_progress();
1515
            }
1516
        }
1517
 
1518
        // Check conditionally everything coming from result (except newpageid because is always set).
1519
        $result = array(
1520
            'newpageid'         => (int) $result->newpageid,
1521
            'inmediatejump'     => $result->inmediatejump,
1522
            'nodefaultresponse' => !empty($result->nodefaultresponse),
1523
            'feedback'          => (isset($result->feedback)) ? $result->feedback : '',
1524
            'attemptsremaining' => (isset($result->attemptsremaining)) ? $result->attemptsremaining : null,
1525
            'correctanswer'     => !empty($result->correctanswer),
1526
            'noanswer'          => !empty($result->noanswer),
1527
            'isessayquestion'   => !empty($result->isessayquestion),
1528
            'maxattemptsreached' => !empty($result->maxattemptsreached),
1529
            'response'          => (isset($result->response)) ? $result->response : '',
1530
            'studentanswer'     => (isset($result->studentanswer)) ? $result->studentanswer : '',
1531
            'userresponse'      => (isset($result->userresponse)) ? $result->userresponse : '',
1532
            'reviewmode'        => $reviewmode,
1533
            'ongoingscore'      => $ongoingscore,
1534
            'progress'          => $progress,
1535
            'displaymenu'       => !empty(lesson_displayleftif($lesson)),
1536
            'messages'          => self::format_lesson_messages($lesson),
1537
            'warnings'          => $warnings,
1538
        );
1539
        return $result;
1540
    }
1541
 
1542
    /**
1543
     * Describes the process_page return value.
1544
     *
1545
     * @return external_single_structure
1546
     * @since Moodle 3.3
1547
     */
1548
    public static function process_page_returns() {
1549
        return new external_single_structure(
1550
            array(
1551
                'newpageid' => new external_value(PARAM_INT, 'New page id (if a jump was made).'),
1552
                'inmediatejump' => new external_value(PARAM_BOOL, 'Whether the page processing redirect directly to anoter page.'),
1553
                'nodefaultresponse' => new external_value(PARAM_BOOL, 'Whether there is not a default response.'),
1554
                'feedback' => new external_value(PARAM_RAW, 'The response feedback.'),
1555
                'attemptsremaining' => new external_value(PARAM_INT, 'Number of attempts remaining.'),
1556
                'correctanswer' => new external_value(PARAM_BOOL, 'Whether the answer is correct.'),
1557
                'noanswer' => new external_value(PARAM_BOOL, 'Whether there aren\'t answers.'),
1558
                'isessayquestion' => new external_value(PARAM_BOOL, 'Whether is a essay question.'),
1559
                'maxattemptsreached' => new external_value(PARAM_BOOL, 'Whether we reachered the max number of attempts.'),
1560
                'response' => new external_value(PARAM_RAW, 'The response.'),
1561
                'studentanswer' => new external_value(PARAM_RAW, 'The student answer.'),
1562
                'userresponse' => new external_value(PARAM_RAW, 'The user response.'),
1563
                'reviewmode' => new external_value(PARAM_BOOL, 'Whether the user is reviewing.'),
1564
                'ongoingscore' => new external_value(PARAM_TEXT, 'The ongoing message.'),
1565
                'progress' => new external_value(PARAM_INT, 'Progress percentage in the lesson.'),
1566
                'displaymenu' => new external_value(PARAM_BOOL, 'Whether we should display the menu or not in this page.'),
1567
                'messages' => self::external_messages(),
1568
                'warnings' => new external_warnings(),
1569
            )
1570
        );
1571
    }
1572
 
1573
    /**
1574
     * Describes the parameters for finish_attempt.
1575
     *
1576
     * @return external_function_parameters
1577
     * @since Moodle 3.3
1578
     */
1579
    public static function finish_attempt_parameters() {
1580
        return new external_function_parameters (
1581
            array(
1582
                'lessonid' => new external_value(PARAM_INT, 'Lesson instance id.'),
1583
                'password' => new external_value(PARAM_RAW, 'Optional password (the lesson may be protected).', VALUE_DEFAULT, ''),
1584
                'outoftime' => new external_value(PARAM_BOOL, 'If the user run out of time.', VALUE_DEFAULT, false),
1585
                'review' => new external_value(PARAM_BOOL, 'If we want to review just after finishing (1 hour margin).',
1586
                    VALUE_DEFAULT, false),
1587
            )
1588
        );
1589
    }
1590
 
1591
    /**
1592
     * Finishes the current attempt.
1593
     *
1594
     * @param int $lessonid lesson instance id
1595
     * @param string $password optional password (the lesson may be protected)
1596
     * @param bool $outoftime optional if the user run out of time
1597
     * @param bool $review if we want to review just after finishing (1 hour margin)
1598
     * @return array of warnings and information about the finished attempt
1599
     * @since Moodle 3.3
1600
     * @throws moodle_exception
1601
     */
1602
    public static function finish_attempt($lessonid, $password = '', $outoftime = false, $review = false) {
1603
 
1604
        $params = array('lessonid' => $lessonid, 'password' => $password, 'outoftime' => $outoftime, 'review' => $review);
1605
        $params = self::validate_parameters(self::finish_attempt_parameters(), $params);
1606
 
1607
        $warnings = array();
1608
 
1609
        list($lesson, $course, $cm, $context, $lessonrecord) = self::validate_lesson($params['lessonid']);
1610
 
1611
        // Update timer so the validation can check the time restrictions.
1612
        $timer = $lesson->update_timer();
1613
 
1614
        // Return the validation to avoid exceptions in case the user is out of time.
1615
        $params['pageid'] = LESSON_EOL;
1616
        $validation = self::validate_attempt($lesson, $params, true);
1617
 
1618
        if (array_key_exists('eolstudentoutoftime', $validation)) {
1619
            // Maybe we run out of time just now.
1620
            $params['outoftime'] = true;
1621
            unset($validation['eolstudentoutoftime']);
1622
        }
1623
        // Check if there are more errors.
1624
        if (!empty($validation)) {
1625
            reset($validation);
1626
            throw new moodle_exception(key($validation), 'lesson', '', current($validation));   // Throw first error.
1627
        }
1628
 
1629
        // Set out of time to normal (it is the only existing mode).
1630
        $outoftimemode = $params['outoftime'] ? 'normal' : '';
1631
        $result = $lesson->process_eol_page($outoftimemode);
1632
 
1633
        // Return the data.
1634
         $validmessages = array(
1635
            'notenoughtimespent', 'numberofpagesviewed', 'youshouldview', 'numberofcorrectanswers',
1636
            'displayscorewithessays', 'displayscorewithoutessays', 'yourcurrentgradeisoutof', 'eolstudentoutoftimenoanswers',
1637
            'welldone', 'displayofgrade', 'modattemptsnoteacher', 'progresscompleted');
1638
 
1639
        $data = array();
1640
        foreach ($result as $el => $value) {
1641
            if ($value !== false) {
1642
                $message = '';
1643
                if (in_array($el, $validmessages)) { // Check if the data comes with an informative message.
1644
                    $a = (is_bool($value)) ? null : $value;
1645
                    $message = get_string($el, 'lesson', $a);
1646
                }
1647
                // Return the data.
1648
                $data[] = array(
1649
                    'name' => $el,
1650
                    'value' => (is_bool($value)) ? 1 : json_encode($value), // The data can be a php object.
1651
                    'message' => $message
1652
                );
1653
            }
1654
        }
1655
 
1656
        $result = array(
1657
            'data'     => $data,
1658
            'messages' => self::format_lesson_messages($lesson),
1659
            'warnings' => $warnings,
1660
        );
1661
        return $result;
1662
    }
1663
 
1664
    /**
1665
     * Describes the finish_attempt return value.
1666
     *
1667
     * @return external_single_structure
1668
     * @since Moodle 3.3
1669
     */
1670
    public static function finish_attempt_returns() {
1671
        return new external_single_structure(
1672
            array(
1673
                'data' => new external_multiple_structure(
1674
                    new external_single_structure(
1675
                        array(
1676
                            'name' => new external_value(PARAM_ALPHANUMEXT, 'Data name.'),
1677
                            'value' => new external_value(PARAM_RAW, 'Data value.'),
1678
                            'message' => new external_value(PARAM_RAW, 'Data message (translated string).'),
1679
                        )
1680
                    ), 'The EOL page information data.'
1681
                ),
1682
                'messages' => self::external_messages(),
1683
                'warnings' => new external_warnings(),
1684
            )
1685
        );
1686
    }
1687
 
1688
    /**
1689
     * Describes the parameters for get_attempts_overview.
1690
     *
1691
     * @return external_function_parameters
1692
     * @since Moodle 3.3
1693
     */
1694
    public static function get_attempts_overview_parameters() {
1695
        return new external_function_parameters (
1696
            array(
1697
                'lessonid' => new external_value(PARAM_INT, 'lesson instance id'),
1698
                'groupid' => new external_value(PARAM_INT, 'group id, 0 means that the function will determine the user group',
1699
                                                VALUE_DEFAULT, 0),
1700
            )
1701
        );
1702
    }
1703
 
1704
    /**
1705
     * Get a list of all the attempts made by users in a lesson.
1706
     *
1707
     * @param int $lessonid lesson instance id
1708
     * @param int $groupid group id, 0 means that the function will determine the user group
1709
     * @return array of warnings and status result
1710
     * @since Moodle 3.3
1711
     * @throws moodle_exception
1712
     */
1713
    public static function get_attempts_overview($lessonid, $groupid = 0) {
1714
 
1715
        $params = array('lessonid' => $lessonid, 'groupid' => $groupid);
1716
        $params = self::validate_parameters(self::get_attempts_overview_parameters(), $params);
1717
        $warnings = array();
1718
 
1719
        list($lesson, $course, $cm, $context, $lessonrecord) = self::validate_lesson($params['lessonid']);
1720
        require_capability('mod/lesson:viewreports', $context);
1721
 
1722
        if (!empty($params['groupid'])) {
1723
            $groupid = $params['groupid'];
1724
            // Determine is the group is visible to user.
1725
            if (!groups_group_visible($groupid, $course, $cm)) {
1726
                throw new moodle_exception('notingroup');
1727
            }
1728
        } else {
1729
            // Check to see if groups are being used here.
1730
            if ($groupmode = groups_get_activity_groupmode($cm)) {
1731
                $groupid = groups_get_activity_group($cm);
1732
                // Determine is the group is visible to user (this is particullary for the group 0 -> all groups).
1733
                if (!groups_group_visible($groupid, $course, $cm)) {
1734
                    throw new moodle_exception('notingroup');
1735
                }
1736
            } else {
1737
                $groupid = 0;
1738
            }
1739
        }
1740
 
1741
        $result = array(
1742
            'warnings' => $warnings
1743
        );
1744
 
1745
        list($table, $data) = lesson_get_overview_report_table_and_data($lesson, $groupid);
1746
        if ($data !== false) {
1747
            $result['data'] = $data;
1748
        }
1749
 
1750
        return $result;
1751
    }
1752
 
1753
    /**
1754
     * Describes the get_attempts_overview return value.
1755
     *
1756
     * @return external_single_structure
1757
     * @since Moodle 3.3
1758
     */
1759
    public static function get_attempts_overview_returns() {
1760
        return new external_single_structure(
1761
            array(
1762
                'data' => new external_single_structure(
1763
                    array(
1764
                        'lessonscored' => new external_value(PARAM_BOOL, 'True if the lesson was scored.'),
1765
                        'numofattempts' => new external_value(PARAM_INT, 'Number of attempts.'),
1766
                        'avescore' => new external_value(PARAM_FLOAT, 'Average score.'),
1767
                        'highscore' => new external_value(PARAM_FLOAT, 'High score.'),
1768
                        'lowscore' => new external_value(PARAM_FLOAT, 'Low score.'),
1769
                        'avetime' => new external_value(PARAM_INT, 'Average time (spent in taking the lesson).'),
1770
                        'hightime' => new external_value(PARAM_INT, 'High time.'),
1771
                        'lowtime' => new external_value(PARAM_INT, 'Low time.'),
1772
                        'students' => new external_multiple_structure(
1773
                            new external_single_structure(
1774
                                array(
1775
                                    'id' => new external_value(PARAM_INT, 'User id.'),
1776
                                    'fullname' => new external_value(PARAM_TEXT, 'User full name.'),
1777
                                    'bestgrade' => new external_value(PARAM_FLOAT, 'Best grade.'),
1778
                                    'attempts' => new external_multiple_structure(
1779
                                        new external_single_structure(
1780
                                            array(
1781
                                                'try' => new external_value(PARAM_INT, 'Attempt number.'),
1782
                                                'grade' => new external_value(PARAM_FLOAT, 'Attempt grade.'),
1783
                                                'timestart' => new external_value(PARAM_INT, 'Attempt time started.'),
1784
                                                'timeend' => new external_value(PARAM_INT, 'Attempt last time continued.'),
1785
                                                'end' => new external_value(PARAM_INT, 'Attempt time ended.'),
1786
                                            )
1787
                                        )
1788
                                    )
1789
                                )
1790
                            ), 'Students data, including attempts.', VALUE_OPTIONAL
1791
                        ),
1792
                    ),
1793
                    'Attempts overview data (empty for no attemps).', VALUE_OPTIONAL
1794
                ),
1795
                'warnings' => new external_warnings(),
1796
            )
1797
        );
1798
    }
1799
 
1800
    /**
1801
     * Describes the parameters for get_user_attempt.
1802
     *
1803
     * @return external_function_parameters
1804
     * @since Moodle 3.3
1805
     */
1806
    public static function get_user_attempt_parameters() {
1807
        return new external_function_parameters (
1808
            array(
1809
                'lessonid' => new external_value(PARAM_INT, 'Lesson instance id.'),
1810
                'userid' => new external_value(PARAM_INT, 'The user id. 0 for current user.'),
1811
                'lessonattempt' => new external_value(PARAM_INT, 'The attempt number.'),
1812
            )
1813
        );
1814
    }
1815
 
1816
    /**
1817
     * Return information about the given user attempt (including answers).
1818
     *
1819
     * @param int $lessonid lesson instance id
1820
     * @param int $userid the user id
1821
     * @param int $lessonattempt the attempt number
1822
     * @return array of warnings and page attempts
1823
     * @since Moodle 3.3
1824
     * @throws moodle_exception
1825
     */
1826
    public static function get_user_attempt($lessonid, $userid, $lessonattempt) {
1827
        global $USER;
1828
 
1829
        $params = array(
1830
            'lessonid' => $lessonid,
1831
            'userid' => $userid,
1832
            'lessonattempt' => $lessonattempt,
1833
        );
1834
        $params = self::validate_parameters(self::get_user_attempt_parameters(), $params);
1835
        $warnings = array();
1836
 
1837
        list($lesson, $course, $cm, $context, $lessonrecord) = self::validate_lesson($params['lessonid']);
1838
 
1839
        // Default value for userid.
1840
        if (empty($params['userid'])) {
1841
            $params['userid'] = $USER->id;
1842
        }
1843
 
1844
        // Extra checks so only users with permissions can view other users attempts.
1845
        if ($USER->id != $params['userid']) {
1846
            self::check_can_view_user_data($params['userid'], $course, $cm, $context);
1847
        }
1848
 
1849
        list($answerpages, $userstats) = lesson_get_user_detailed_report_data($lesson, $userid, $params['lessonattempt']);
1850
        // Convert page object to page record.
1851
        foreach ($answerpages as $answerp) {
1852
            $answerp->page = self::get_page_fields($answerp->page);
1853
        }
1854
 
1855
        $result = array(
1856
            'answerpages' => $answerpages,
1857
            'userstats' => $userstats,
1858
            'warnings' => $warnings,
1859
        );
1860
        return $result;
1861
    }
1862
 
1863
    /**
1864
     * Describes the get_user_attempt return value.
1865
     *
1866
     * @return external_single_structure
1867
     * @since Moodle 3.3
1868
     */
1869
    public static function get_user_attempt_returns() {
1870
        return new external_single_structure(
1871
            array(
1872
                'answerpages' => new external_multiple_structure(
1873
                    new external_single_structure(
1874
                        array(
1875
                            'page' => self::get_page_structure(VALUE_OPTIONAL),
1876
                            'title' => new external_value(PARAM_RAW, 'Page title.'),
1877
                            'contents' => new external_value(PARAM_RAW, 'Page contents.'),
1878
                            'qtype' => new external_value(PARAM_TEXT, 'Identifies the page type of this page.'),
1879
                            'grayout' => new external_value(PARAM_INT, 'If is required to apply a grayout.'),
1880
                            'answerdata' => new external_single_structure(
1881
                                array(
1882
                                    'score' => new external_value(PARAM_TEXT, 'The score (text version).'),
1883
                                    'response' => new external_value(PARAM_RAW, 'The response text.'),
1884
                                    'responseformat' => new external_format_value('response.'),
1885
                                    'answers' => new external_multiple_structure(
1886
                                        new external_multiple_structure(new external_value(PARAM_RAW, 'Possible answers and info.')),
1887
                                        'User answers',
1888
                                        VALUE_OPTIONAL
1889
                                    ),
1890
                                ), 'Answer data (empty in content pages created in Moodle 1.x).', VALUE_OPTIONAL
1891
                            )
1892
                        )
1893
                    )
1894
                ),
1895
                'userstats' => new external_single_structure(
1896
                    array(
1897
                        'grade' => new external_value(PARAM_FLOAT, 'Attempt final grade.'),
1898
                        'completed' => new external_value(PARAM_INT, 'Time completed.'),
1899
                        'timetotake' => new external_value(PARAM_INT, 'Time taken.'),
1900
                        'gradeinfo' => self::get_user_attempt_grade_structure(VALUE_OPTIONAL)
1901
                    )
1902
                ),
1903
                'warnings' => new external_warnings(),
1904
            )
1905
        );
1906
    }
1907
 
1908
    /**
1909
     * Describes the parameters for get_pages_possible_jumps.
1910
     *
1911
     * @return external_function_parameters
1912
     * @since Moodle 3.3
1913
     */
1914
    public static function get_pages_possible_jumps_parameters() {
1915
        return new external_function_parameters (
1916
            array(
1917
                'lessonid' => new external_value(PARAM_INT, 'lesson instance id'),
1918
            )
1919
        );
1920
    }
1921
 
1922
    /**
1923
     * Return all the possible jumps for the pages in a given lesson.
1924
     *
1925
     * You may expect different results on consecutive executions due to the random nature of the lesson module.
1926
     *
1927
     * @param int $lessonid lesson instance id
1928
     * @return array of warnings and possible jumps
1929
     * @since Moodle 3.3
1930
     * @throws moodle_exception
1931
     */
1932
    public static function get_pages_possible_jumps($lessonid) {
1933
        global $USER;
1934
 
1935
        $params = array('lessonid' => $lessonid);
1936
        $params = self::validate_parameters(self::get_pages_possible_jumps_parameters(), $params);
1937
 
1938
        $warnings = $jumps = array();
1939
 
1940
        list($lesson, $course, $cm, $context) = self::validate_lesson($params['lessonid']);
1941
 
1942
        // Only return for managers or if offline attempts are enabled.
1943
        if ($lesson->can_manage() || $lesson->allowofflineattempts) {
1944
 
1945
            $lessonpages = $lesson->load_all_pages();
1946
            foreach ($lessonpages as $page) {
1947
                $jump = array();
1948
                $jump['pageid'] = $page->id;
1949
 
1950
                $answers = $page->get_answers();
1951
                if (count($answers) > 0) {
1952
                    foreach ($answers as $answer) {
1953
                        $jump['answerid'] = $answer->id;
1954
                        $jump['jumpto'] = $answer->jumpto;
1955
                        $jump['calculatedjump'] = $lesson->calculate_new_page_on_jump($page, $answer->jumpto);
1956
                        // Special case, only applies to branch/end of branch.
1957
                        if ($jump['calculatedjump'] == LESSON_RANDOMBRANCH) {
1958
                            $jump['calculatedjump'] = lesson_unseen_branch_jump($lesson, $USER->id);
1959
                        }
1960
                        $jumps[] = $jump;
1961
                    }
1962
                } else {
1963
                    // Imported lessons from 1.x.
1964
                    $jump['answerid'] = 0;
1965
                    $jump['jumpto'] = $page->nextpageid;
1966
                    $jump['calculatedjump'] = $lesson->calculate_new_page_on_jump($page, $page->nextpageid);
1967
                    $jumps[] = $jump;
1968
                }
1969
            }
1970
        }
1971
 
1972
        $result = array(
1973
            'jumps' => $jumps,
1974
            'warnings' => $warnings,
1975
        );
1976
        return $result;
1977
    }
1978
 
1979
    /**
1980
     * Describes the get_pages_possible_jumps return value.
1981
     *
1982
     * @return external_single_structure
1983
     * @since Moodle 3.3
1984
     */
1985
    public static function get_pages_possible_jumps_returns() {
1986
        return new external_single_structure(
1987
            array(
1988
                'jumps' => new external_multiple_structure(
1989
                    new external_single_structure(
1990
                        array(
1991
                            'pageid' => new external_value(PARAM_INT, 'The page id'),
1992
                            'answerid' => new external_value(PARAM_INT, 'The answer id'),
1993
                            'jumpto' => new external_value(PARAM_INT, 'The jump (page id or type of jump)'),
1994
                            'calculatedjump' => new external_value(PARAM_INT, 'The real page id (or EOL) to jump'),
1995
                        ), 'Jump for a page answer'
1996
                    )
1997
                ),
1998
                'warnings' => new external_warnings(),
1999
            )
2000
        );
2001
    }
2002
 
2003
    /**
2004
     * Describes the parameters for get_lesson.
2005
     *
2006
     * @return external_function_parameters
2007
     * @since Moodle 3.3
2008
     */
2009
    public static function get_lesson_parameters() {
2010
        return new external_function_parameters (
2011
            array(
2012
                'lessonid' => new external_value(PARAM_INT, 'lesson instance id'),
2013
                'password' => new external_value(PARAM_RAW, 'lesson password', VALUE_DEFAULT, ''),
2014
            )
2015
        );
2016
    }
2017
 
2018
    /**
2019
     * Return information of a given lesson.
2020
     *
2021
     * @param int $lessonid lesson instance id
2022
     * @param string $password optional password (the lesson may be protected)
2023
     * @return array of warnings and status result
2024
     * @since Moodle 3.3
2025
     * @throws moodle_exception
2026
     */
2027
    public static function get_lesson($lessonid, $password = '') {
2028
        global $PAGE;
2029
 
2030
        $params = array('lessonid' => $lessonid, 'password' => $password);
2031
        $params = self::validate_parameters(self::get_lesson_parameters(), $params);
2032
        $warnings = array();
2033
 
2034
        list($lesson, $course, $cm, $context, $lessonrecord) = self::validate_lesson($params['lessonid']);
2035
 
2036
        $lessonrecord = self::get_lesson_summary_for_exporter($lessonrecord, $params['password']);
2037
        $exporter = new lesson_summary_exporter($lessonrecord, array('context' => $context));
2038
 
2039
        $result = array();
2040
        $result['lesson'] = $exporter->export($PAGE->get_renderer('core'));
2041
        $result['warnings'] = $warnings;
2042
        return $result;
2043
    }
2044
 
2045
    /**
2046
     * Describes the get_lesson return value.
2047
     *
2048
     * @return external_single_structure
2049
     * @since Moodle 3.3
2050
     */
2051
    public static function get_lesson_returns() {
2052
        return new external_single_structure(
2053
            array(
2054
                'lesson' => lesson_summary_exporter::get_read_structure(),
2055
                'warnings' => new external_warnings(),
2056
            )
2057
        );
2058
    }
2059
}