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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Library of interface functions and constants.
 *
 * @package     mod_h5pactivity
 * @copyright   2020 Ferran Recio <ferran@moodle.com>
 * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

use mod_h5pactivity\local\manager;
use mod_h5pactivity\local\grader;
use mod_h5pactivity\xapi\handler;

/**
 * Checks if H5P activity supports a specific feature.
 *
 * @uses FEATURE_GROUPS
 * @uses FEATURE_GROUPINGS
 * @uses FEATURE_MOD_INTRO
 * @uses FEATURE_SHOW_DESCRIPTION
 * @uses FEATURE_COMPLETION_TRACKS_VIEWS
 * @uses FEATURE_COMPLETION_HAS_RULES
 * @uses FEATURE_MODEDIT_DEFAULT_COMPLETION
 * @uses FEATURE_GRADE_HAS_GRADE
 * @uses FEATURE_GRADE_OUTCOMES
 * @uses FEATURE_BACKUP_MOODLE2
 * @param string $feature FEATURE_xx constant for requested feature
 * @return mixed True if module supports feature, false if not, null if doesn't know or string for the module purpose.
 */
function h5pactivity_supports(string $feature) {
    switch($feature) {
        case FEATURE_GROUPS:
            return true;
        case FEATURE_GROUPINGS:
            return true;
        case FEATURE_MOD_INTRO:
            return true;
        case FEATURE_SHOW_DESCRIPTION:
            return true;
        case FEATURE_COMPLETION_TRACKS_VIEWS:
            return true;
        case FEATURE_MODEDIT_DEFAULT_COMPLETION:
            return true;
        case FEATURE_GRADE_HAS_GRADE:
            return true;
        case FEATURE_GRADE_OUTCOMES:
            return true;
        case FEATURE_BACKUP_MOODLE2:
            return true;
        case FEATURE_MOD_PURPOSE:
            return MOD_PURPOSE_INTERACTIVECONTENT;
        default:
            return null;
    }
}

/**
 * Saves a new instance of the mod_h5pactivity into the database.
 *
 * Given an object containing all the necessary data, (defined by the form
 * in mod_form.php) this function will create a new instance and return the id
 * number of the instance.
 *
 * @param stdClass $data An object from the form.
 * @param mod_h5pactivity_mod_form $mform The form.
 * @return int The id of the newly inserted record.
 */
function h5pactivity_add_instance(stdClass $data, mod_h5pactivity_mod_form $mform = null): int {
    global $DB;

    $data->timecreated = time();
    $data->timemodified = $data->timecreated;
    $cmid = $data->coursemodule;

    $data->id = $DB->insert_record('h5pactivity', $data);

    // We need to use context now, so we need to make sure all needed info is already in db.
    $DB->set_field('course_modules', 'instance', $data->id, ['id' => $cmid]);
    h5pactivity_set_mainfile($data);

    // Extra fields required in grade related functions.
    $data->cmid = $data->coursemodule;
    h5pactivity_grade_item_update($data);
    return $data->id;
}

/**
 * Updates an instance of the mod_h5pactivity in the database.
 *
 * Given an object containing all the necessary data (defined in mod_form.php),
 * this function will update an existing instance with new data.
 *
 * @param stdClass $data An object from the form in mod_form.php.
 * @param mod_h5pactivity_mod_form $mform The form.
 * @return bool True if successful, false otherwise.
 */
function h5pactivity_update_instance(stdClass $data, mod_h5pactivity_mod_form $mform = null): bool {
    global $DB;

    $data->timemodified = time();
    $data->id = $data->instance;

    h5pactivity_set_mainfile($data);

    // Update gradings if grading method or tracking are modified.
    $data->cmid = $data->coursemodule;
    $moduleinstance = $DB->get_record('h5pactivity', ['id' => $data->id]);
    if (($moduleinstance->grademethod != $data->grademethod)
            || $data->enabletracking != $moduleinstance->enabletracking) {
        h5pactivity_update_grades($data);
    } else {
        h5pactivity_grade_item_update($data);
    }

    return $DB->update_record('h5pactivity', $data);
}

/**
 * Removes an instance of the mod_h5pactivity from the database.
 *
 * @param int $id Id of the module instance.
 * @return bool True if successful, false on failure.
 */
function h5pactivity_delete_instance(int $id): bool {
    global $DB;

    $activity = $DB->get_record('h5pactivity', ['id' => $id]);
    if (!$activity) {
        return false;
    }

    if ($cm = get_coursemodule_from_instance('h5pactivity', $activity->id)) {
        $context = context_module::instance($cm->id);
        $xapihandler = handler::create('mod_h5pactivity');
        $xapihandler->wipe_states($context->id);
    }

    // Remove activity record, and all associated attempt data.
    $attemptids = $DB->get_fieldset_select('h5pactivity_attempts', 'id', 'h5pactivityid = ?', [$id]);
    if ($attemptids) {
        $DB->delete_records_list('h5pactivity_attempts_results', 'attemptid', $attemptids);
        $DB->delete_records_list('h5pactivity_attempts', 'id', $attemptids);
    }

    $DB->delete_records('h5pactivity', ['id' => $id]);

    h5pactivity_grade_item_delete($activity);

    return true;
}

/**
 * Checks if scale is being used by any instance of mod_h5pactivity.
 *
 * This is used to find out if scale used anywhere.
 *
 * @param int $scaleid ID of the scale.
 * @return bool True if the scale is used by any mod_h5pactivity instance.
 */
function h5pactivity_scale_used_anywhere(int $scaleid): bool {
    global $DB;

    if ($scaleid and $DB->record_exists('h5pactivity', ['grade' => -$scaleid])) {
        return true;
    } else {
        return false;
    }
}

/**
 * Creates or updates grade item for the given mod_h5pactivity instance.
 *
 * Needed by {@link grade_update_mod_grades()}.
 *
 * @param stdClass $moduleinstance Instance object with extra cmidnumber and modname property.
 * @param mixed $grades optional array/object of grade(s); 'reset' means reset grades in gradebook
 * @return int int 0 if ok, error code otherwise
 */
function h5pactivity_grade_item_update(stdClass $moduleinstance, $grades = null): int {
    $idnumber = $moduleinstance->idnumber ?? '';
    $grader = new grader($moduleinstance, $idnumber);
    return $grader->grade_item_update($grades);
}

/**
 * Delete grade item for given mod_h5pactivity instance.
 *
 * @param stdClass $moduleinstance Instance object.
 * @return int Returns GRADE_UPDATE_OK, GRADE_UPDATE_FAILED, GRADE_UPDATE_MULTIPLE or GRADE_UPDATE_ITEM_LOCKED
 */
function h5pactivity_grade_item_delete(stdClass $moduleinstance): ?int {
    $idnumber = $moduleinstance->idnumber ?? '';
    $grader = new grader($moduleinstance, $idnumber);
    return $grader->grade_item_delete();
}

/**
 * Update mod_h5pactivity grades in the gradebook.
 *
 * Needed by {@link grade_update_mod_grades()}.
 *
 * @param stdClass $moduleinstance Instance object with extra cmidnumber and modname property.
 * @param int $userid Update grade of specific user only, 0 means all participants.
 */
function h5pactivity_update_grades(stdClass $moduleinstance, int $userid = 0): void {
    $idnumber = $moduleinstance->idnumber ?? '';
    $grader = new grader($moduleinstance, $idnumber);
    $grader->update_grades($userid);
}

/**
 * Rescale all grades for this activity and push the new grades to the gradebook.
 *
 * @param stdClass $course Course db record
 * @param stdClass $cm Course module db record
 * @param float $oldmin
 * @param float $oldmax
 * @param float $newmin
 * @param float $newmax
 * @return bool true if reescale is successful
 */
function h5pactivity_rescale_activity_grades(stdClass $course, stdClass $cm, float $oldmin,
        float $oldmax, float $newmin, float $newmax): bool {

    $manager = manager::create_from_coursemodule($cm);
    $grader = $manager->get_grader();
    $grader->update_grades();
    return true;
}

/**
 * Implementation of the function for printing the form elements that control
 * whether the course reset functionality affects the H5P activity.
 *
 * @param MoodleQuickForm $mform form passed by reference
 */
function h5pactivity_reset_course_form_definition(&$mform): void {
    $mform->addElement('header', 'h5pactivityheader', get_string('modulenameplural', 'mod_h5pactivity'));
    $mform->addElement('advcheckbox', 'reset_h5pactivity', get_string('deleteallattempts', 'mod_h5pactivity'));
}

/**
 * Course reset form defaults.
 *
 * @param stdClass $course the course object
 * @return array
 */
function h5pactivity_reset_course_form_defaults(stdClass $course): array {
    return ['reset_h5pactivity' => 1];
}


/**
 * This function is used by the reset_course_userdata function in moodlelib.
 *
 * This function will remove all H5P attempts in the database
 * and clean up any related data.
 *
 * @param stdClass $data the data submitted from the reset course.
 * @return array of reseting status
 */
function h5pactivity_reset_userdata(stdClass $data): array {
    global $DB;
    $componentstr = get_string('modulenameplural', 'mod_h5pactivity');
    $status = [];
    if (!empty($data->reset_h5pactivity)) {
        $params = ['courseid' => $data->courseid];
        $sql = "SELECT a.id FROM {h5pactivity} a WHERE a.course=:courseid";
        if ($activities = $DB->get_records_sql($sql, $params)) {
            $xapihandler = handler::create('mod_h5pactivity');
            foreach ($activities as $activity) {
                $cm = get_coursemodule_from_instance('h5pactivity',
                                                     $activity->id,
                                                     $data->courseid,
                                                     false,
                                                     MUST_EXIST);
                mod_h5pactivity\local\attempt::delete_all_attempts ($cm);
                $context = context_module::instance($cm->id);
                $xapihandler->wipe_states($context->id);
            }
        }
        // Remove all grades from gradebook.
        if (empty($data->reset_gradebook_grades)) {
            h5pactivity_reset_gradebook($data->courseid, 'reset');
        }
        $status[] = [
            'component' => $componentstr,
            'item' => get_string('deleteallattempts', 'mod_h5pactivity'),
            'error' => false,
        ];
    }
    return $status;
}

/**
 * Removes all grades from gradebook
 *
 * @param int $courseid Coude ID
 * @param string $type optional type (default '')
 */
function h5pactivity_reset_gradebook(int $courseid, string $type=''): void {
    global $DB;

    $sql = "SELECT a.*, cm.idnumber as cmidnumber, a.course as courseid
              FROM {h5pactivity} a, {course_modules} cm, {modules} m
             WHERE m.name='h5pactivity' AND m.id=cm.module AND cm.instance=a.id AND a.course=?";

    if ($activities = $DB->get_records_sql($sql, [$courseid])) {
        foreach ($activities as $activity) {
            h5pactivity_grade_item_update($activity, 'reset');
        }
    }
}

/**
 * Return a list of page types
 *
 * @param string $pagetype current page type
 * @param stdClass|null $parentcontext Block's parent context
 * @param stdClass $currentcontext Current context of block
 * @return array array of page types and it's names
 */
function h5pactivity_page_type_list(string $pagetype, ?stdClass $parentcontext, stdClass $currentcontext): array {
    $modulepagetype = [
        'mod-h5pactivity-*' => get_string('page-mod-h5pactivity-x', 'h5pactivity'),
    ];
    return $modulepagetype;
}

/**
 * Check if the module has any update that affects the current user since a given time.
 *
 * @param  cm_info $cm course module data
 * @param  int $from the time to check updates from
 * @param  array $filter  if we need to check only specific updates
 * @return stdClass an object with the different type of areas indicating if they were updated or not
 */
function h5pactivity_check_updates_since(cm_info $cm, int $from, array $filter = []): stdClass {
    global $DB, $USER;

    $updates = course_check_module_updates_since($cm, $from, ['package'], $filter);

    $updates->tracks = (object) ['updated' => false];
    $select = 'h5pactivityid = ? AND userid = ? AND timemodified > ?';
    $params = [$cm->instance, $USER->id, $from];
    $tracks = $DB->get_records_select('h5pactivity_attempts', $select, $params, '', 'id');
    if (!empty($tracks)) {
        $updates->tracks->updated = true;
        $updates->tracks->itemids = array_keys($tracks);
    }

    // Now, teachers should see other students updates.
    if (has_capability('mod/h5pactivity:reviewattempts', $cm->context)) {
        $select = 'h5pactivityid = ? AND timemodified > ?';
        $params = [$cm->instance, $from];

        if (groups_get_activity_groupmode($cm) == SEPARATEGROUPS) {
            $groupusers = array_keys(groups_get_activity_shared_group_members($cm));
            if (empty($groupusers)) {
                return $updates;
            }
            list($insql, $inparams) = $DB->get_in_or_equal($groupusers);
            $select .= ' AND userid ' . $insql;
            $params = array_merge($params, $inparams);
        }

        $updates->usertracks = (object) ['updated' => false];
        $tracks = $DB->get_records_select('h5pactivity_attempts', $select, $params, '', 'id');
        if (!empty($tracks)) {
            $updates->usertracks->updated = true;
            $updates->usertracks->itemids = array_keys($tracks);
        }
    }
    return $updates;
}

/**
 * Returns the lists of all browsable file areas within the given module context.
 *
 * The file area 'intro' for the activity introduction field is added automatically
 * by {@link file_browser::get_file_info_context_module()}.
 *
 * @param stdClass $course course object
 * @param stdClass $cm course module object
 * @param stdClass $context context object
 * @return string[] array of pair file area => human file area name
 */
function h5pactivity_get_file_areas(stdClass $course, stdClass $cm, stdClass $context): array {
    $areas = [];
    $areas['package'] = get_string('areapackage', 'mod_h5pactivity');
    return $areas;
}

/**
 * File browsing support for data module.
 *
 * @param file_browser $browser
 * @param array $areas
 * @param stdClass $course
 * @param stdClass $cm
 * @param context $context
 * @param string $filearea
 * @param int|null $itemid
 * @param string|null $filepath
 * @param string|null $filename
 * @return file_info_stored|null file_info_stored instance or null if not found
 */
function h5pactivity_get_file_info(file_browser $browser, array $areas, stdClass $course,
            stdClass $cm, context $context, string $filearea, ?int $itemid = null,
            ?string $filepath = null, ?string $filename = null): ?file_info_stored {
    global $CFG;

    if (!has_capability('moodle/course:managefiles', $context)) {
        return null;
    }

    $fs = get_file_storage();

    if ($filearea === 'package') {
        $filepath = is_null($filepath) ? '/' : $filepath;
        $filename = is_null($filename) ? '.' : $filename;

        $urlbase = $CFG->wwwroot.'/pluginfile.php';
        if (!$storedfile = $fs->get_file($context->id, 'mod_h5pactivity', 'package', 0, $filepath, $filename)) {
            if ($filepath === '/' and $filename === '.') {
                $storedfile = new virtual_root_file($context->id, 'mod_h5pactivity', 'package', 0);
            } else {
                // Not found.
                return null;
            }
        }
        return new file_info_stored($browser, $context, $storedfile, $urlbase, $areas[$filearea], false, true, false, false);
    }
    return null;
}

/**
 * Serves the files from the mod_h5pactivity file areas.
 *
 * @param mixed $course course or id of the course
 * @param mixed $cm course module or id of the course module
 * @param context $context
 * @param string $filearea
 * @param array $args
 * @param bool $forcedownload
 * @param array $options additional options affecting the file serving
 * @return bool false if file not found, does not return if found - just send the file
 */
function h5pactivity_pluginfile($course, $cm, context $context,
            string $filearea, array $args, bool $forcedownload, array $options = []): bool {
    if ($context->contextlevel != CONTEXT_MODULE) {
        return false;
    }

    require_login($course, true, $cm);

    $fullpath = '';

    if ($filearea === 'package') {
        $revision = (int)array_shift($args); // Prevents caching problems - ignored here.
        $relativepath = implode('/', $args);
        $fullpath = "/$context->id/mod_h5pactivity/package/0/$relativepath";
    }
    if (empty($fullpath)) {
        return false;
    }
    $fs = get_file_storage();
    $file = $fs->get_file_by_hash(sha1($fullpath));
    if (empty($file)) {
        return false;
    }
    send_stored_file($file, $lifetime, 0, false, $options);
}

/**
 * Saves draft files as the activity package.
 *
 * @param stdClass $data an object from the form
 */
function h5pactivity_set_mainfile(stdClass $data): void {
    $fs = get_file_storage();
    $cmid = $data->coursemodule;
    $context = context_module::instance($cmid);

    if (!empty($data->packagefile)) {
        $fs = get_file_storage();
        $fs->delete_area_files($context->id, 'mod_h5pactivity', 'package');
        file_save_draft_area_files($data->packagefile, $context->id, 'mod_h5pactivity', 'package',
            0, ['subdirs' => 0, 'maxfiles' => 1]);
    }
}

/**
 * Register the ability to handle drag and drop file uploads
 * @return array containing details of the files / types the mod can handle
 */
function h5pactivity_dndupload_register(): array {
    return [
        'files' => [
            [
                'extension' => 'h5p',
                'message' => get_string('dnduploadh5pactivity', 'h5pactivity')
            ]
        ]
    ];
}

/**
 * Handle a file that has been uploaded
 * @param object $uploadinfo details of the file / content that has been uploaded
 * @return int instance id of the newly created mod
 */
function h5pactivity_dndupload_handle($uploadinfo): int {
    global $CFG;

    $context = context_module::instance($uploadinfo->coursemodule);
    file_save_draft_area_files($uploadinfo->draftitemid, $context->id, 'mod_h5pactivity', 'package', 0);
    $fs = get_file_storage();
    $files = $fs->get_area_files($context->id, 'mod_h5pactivity', 'package', 0, 'sortorder, itemid, filepath, filename', false);
    $file = reset($files);

    // Create a default h5pactivity object to pass to h5pactivity_add_instance()!
    $h5p = get_config('h5pactivity');
    $h5p->intro = '';
    $h5p->introformat = FORMAT_HTML;
    $h5p->course = $uploadinfo->course->id;
    $h5p->coursemodule = $uploadinfo->coursemodule;
    $h5p->grade = $CFG->gradepointdefault;

    // Add some special handling for the H5P options checkboxes.
    $factory = new \core_h5p\factory();
    $core = $factory->get_core();
    if (isset($uploadinfo->displayopt)) {
        $config = (object) $uploadinfo->displayopt;
    } else {
        $config = \core_h5p\helper::decode_display_options($core);
    }
    $h5p->displayoptions = \core_h5p\helper::get_display_options($core, $config);

    $h5p->cmidnumber = '';
    $h5p->name = $uploadinfo->displayname;
    $h5p->reference = $file->get_filename();

    return h5pactivity_add_instance($h5p, null);
}

/**
 * Print recent activity from all h5pactivities in a given course
 *
 * This is used by the recent activity block
 * @param mixed $course the course to print activity for
 * @param bool $viewfullnames boolean to determine whether to show full names or not
 * @param int $timestart the time the rendering started
 * @return bool true if activity was printed, false otherwise.
 */
function h5pactivity_print_recent_activity($course, bool $viewfullnames, int $timestart): bool {
    global $CFG, $DB, $OUTPUT, $USER;

    $dbparams = [$timestart, $course->id, 'h5pactivity'];

    $userfieldsapi = \core_user\fields::for_userpic();
    $namefields = $userfieldsapi->get_sql('u', false, '', 'userid', false)->selects;;

    $sql = "SELECT h5pa.id, h5pa.timemodified, cm.id as cmid, $namefields
              FROM {h5pactivity_attempts} h5pa
              JOIN {h5pactivity} h5p ON h5p.id = h5pa.h5pactivityid
              JOIN {course_modules} cm ON cm.instance = h5p.id
              JOIN {modules} md ON md.id = cm.module
              JOIN {user} u ON u.id = h5pa.userid
             WHERE h5pa.timemodified >= ?
               AND h5p.course = ?
               AND md.name = ?
          ORDER BY h5pa.timemodified ASC";

    if (!$submissions = $DB->get_records_sql($sql, $dbparams)) {
        return false;
    }

    $modinfo = get_fast_modinfo($course);

    $recentactivity = h5pactivity_fetch_recent_activity($submissions, $course->id);

    if (empty($recentactivity)) {
        return false;
    }

    $cms = $modinfo->get_cms();

    echo $OUTPUT->heading(get_string('newsubmissions', 'h5pactivity') . ':', 6);

    foreach ($recentactivity as $submission) {
        $cm = $cms[$submission->cmid];
        $link = $CFG->wwwroot.'/mod/h5pactivity/view.php?id='.$cm->id;
        print_recent_activity_note($submission->timemodified,
            $submission,
            $cm->name,
            $link,
            false,
            $viewfullnames);
    }

    return true;
}

/**
 * Returns all h5pactivities since a given time.
 *
 * @param array $activities The activity information is returned in this array
 * @param int $index The current index in the activities array
 * @param int $timestart The earliest activity to show
 * @param int $courseid Limit the search to this course
 * @param int $cmid The course module id
 * @param int $userid Optional user id
 * @param int $groupid Optional group id
 * @return void
 */
function h5pactivity_get_recent_mod_activity(array &$activities, int &$index, int $timestart, int $courseid,
            int $cmid, int $userid=0, int $groupid=0) {
    global $CFG, $DB, $USER;

    $course = get_course($courseid);
    $modinfo = get_fast_modinfo($course);

    $cm = $modinfo->get_cm($cmid);
    $params = [];
    if ($userid) {
        $userselect = 'AND u.id = :userid';
        $params['userid'] = $userid;
    } else {
        $userselect = '';
    }

    if ($groupid) {
        $groupselect = 'AND gm.groupid = :groupid';
        $groupjoin = 'JOIN {groups_members} gm ON gm.userid=u.id';
        $params['groupid'] = $groupid;
    } else {
        $groupselect = '';
        $groupjoin = '';
    }

    $params['cminstance'] = $cm->instance;
    $params['timestart'] = $timestart;
    $params['cmid'] = $cmid;

    $userfieldsapi = \core_user\fields::for_userpic();
    $userfields = $userfieldsapi->get_sql('u', false, '', 'userid', false)->selects;

    $sql = "SELECT h5pa.id, h5pa.timemodified, cm.id as cmid, $userfields
              FROM {h5pactivity_attempts} h5pa
              JOIN {h5pactivity} h5p ON h5p.id = h5pa.h5pactivityid
              JOIN {course_modules} cm ON cm.instance = h5p.id
              JOIN {modules} md ON md.id = cm.module
              JOIN {user} u ON u.id = h5pa.userid $groupjoin
             WHERE h5pa.timemodified >= :timestart
               AND h5p.id = :cminstance $userselect $groupselect
               AND cm.id = :cmid
          ORDER BY h5pa.timemodified ASC";

    if (!$submissions = $DB->get_records_sql($sql, $params)) {
        return;
    }

    $cmcontext = context_module::instance($cm->id);
    $grader = has_capability('mod/h5pactivity:reviewattempts', $cmcontext);
    $viewfullnames = has_capability('moodle/site:viewfullnames', $cmcontext);

    $recentactivity = h5pactivity_fetch_recent_activity($submissions, $courseid);

    if (empty($recentactivity)) {
        return;
    }

    if ($grader) {
        require_once($CFG->libdir.'/gradelib.php');
        $userids = [];
        foreach ($recentactivity as $id => $submission) {
            $userids[] = $submission->userid;
        }
        $grades = grade_get_grades($courseid, 'mod', 'h5pactivity', $cm->instance, $userids);
    }

    $aname = format_string($cm->name, true);
    foreach ($recentactivity as $submission) {
        $activity = new stdClass();

        $activity->type = 'h5pactivity';
        $activity->cmid = $cm->id;
        $activity->name = $aname;
        $activity->sectionnum = $cm->sectionnum;
        $activity->timestamp = $submission->timemodified;
        $activity->user = new stdClass();
        if ($grader) {
            $activity->grade = $grades->items[0]->grades[$submission->userid]->str_long_grade;
        }

        $userfields = explode(',', implode(',', \core_user\fields::get_picture_fields()));
        foreach ($userfields as $userfield) {
            if ($userfield == 'id') {
                // Aliased in SQL above.
                $activity->user->{$userfield} = $submission->userid;
            } else {
                $activity->user->{$userfield} = $submission->{$userfield};
            }
        }
        $activity->user->fullname = fullname($submission, $viewfullnames);

        $activities[$index++] = $activity;
    }

    return;
}

/**
 * Print recent activity from all h5pactivities in a given course
 *
 * This is used by course/recent.php
 * @param stdClass $activity
 * @param int $courseid
 * @param bool $detail
 * @param array $modnames
 */
function h5pactivity_print_recent_mod_activity(stdClass $activity, int $courseid, bool $detail, array $modnames) {
    global $OUTPUT;

    $modinfo = [];
    if ($detail) {
        $modinfo['modname'] = $activity->name;
        $modinfo['modurl'] = new moodle_url('/mod/h5pactivity/view.php', ['id' => $activity->cmid]);
        $modinfo['modicon'] = $OUTPUT->image_icon('monologo', $modnames[$activity->type], 'h5pactivity');
    }

    $userpicture = $OUTPUT->user_picture($activity->user);

    $template = ['userpicture' => $userpicture,
        'submissiontimestamp' => $activity->timestamp,
        'modinfo' => $modinfo,
        'userurl' => new moodle_url('/user/view.php', array('id' => $activity->user->id, 'course' => $courseid)),
        'fullname' => $activity->user->fullname];
    if (isset($activity->grade)) {
        $template['grade'] = get_string('gradenoun_h5p', 'h5pactivity', $activity->grade);
    }

    echo $OUTPUT->render_from_template('mod_h5pactivity/reviewattempts', $template);
}

/**
 * Fetches recent activity for course module.
 *
 * @param array $submissions The activity submissions
 * @param int $courseid Limit the search to this course
 * @return array $recentactivity recent activity in a course.
 */
function h5pactivity_fetch_recent_activity(array $submissions, int $courseid): array {
    global $USER;

    $course = get_course($courseid);
    $modinfo = get_fast_modinfo($course);

    $recentactivity = [];
    $grader = [];

    $cms = $modinfo->get_cms();

    foreach ($submissions as $submission) {
        if (!array_key_exists($submission->cmid, $cms)) {
            continue;
        }
        $cm = $cms[$submission->cmid];
        if (!$cm->uservisible) {
            continue;
        }

        if ($USER->id == $submission->userid) {
            $recentactivity[$submission->userid] = $submission;
            continue;
        }

        $cmcontext = context_module::instance($cm->id);
        // The act of submitting of attempt may be considered private -
        // only graders will see it if specified.
        if (!array_key_exists($cm->id, $grader)) {
            $grader[$cm->id] = has_capability('mod/h5pactivity:reviewattempts', $cmcontext);
        }
        if (!$grader[$cm->id]) {
            continue;
        }

        $groups = [];
        $usersgroups = [];

        $groupmode = groups_get_activity_groupmode($cm, $course);
        $accessallgroups = has_capability('moodle/site:accessallgroups', $cmcontext);

        if ($groupmode == SEPARATEGROUPS && !$accessallgroups) {

            if (isguestuser()) {
                // Shortcut - guest user does not belong into any group.
                continue;
            }

            if (!isset($groups[$cm->groupingid])) {
                $groups[$cm->groupingid] = $modinfo->get_groups($cm->groupingid);
                if (!$groups[$cm->groupingid]) {
                    continue;
                }
            }

            if (!isset($usersgroups[$cm->groupingid][$submission->userid])) {
                $usersgroups[$cm->groupingid][$submission->userid] =
                    groups_get_all_groups($course->id, $submission->userid, $cm->groupingid, 'g.*', false, true);
            }

            if (is_array($usersgroups[$cm->groupingid][$submission->userid])) {
                $usersgroupstmp = array_keys($usersgroups[$cm->groupingid][$submission->userid]);
                $intersect = array_intersect($usersgroupstmp, $groups[$cm->groupingid]);
                if (empty($intersect)) {
                    continue;
                }
            }
        }

        $recentactivity[$submission->userid] = $submission;
    }

    return $recentactivity;
}

/**
 * Extends the settings navigation with the H5P activity settings

 * This function is called when the context for the page is an H5P activity. This is not called by AJAX
 * so it is safe to rely on the $PAGE.
 *
 * @param settings_navigation $settingsnav The settings navigation object
 * @param navigation_node $h5pactivitynode The node to add module settings to
 */
function h5pactivity_extend_settings_navigation(settings_navigation $settingsnav,
        navigation_node $h5pactivitynode = null) {
    global $USER;

    $manager = manager::create_from_coursemodule($settingsnav->get_page()->cm);

    // Attempts report.
    if ($manager->can_view_all_attempts()) {
        $attemptsreporturl = new moodle_url('/mod/h5pactivity/report.php',
            ['a' => $settingsnav->get_page()->cm->instance]);
        $h5pactivitynode->add(get_string('attempts_report', 'h5pactivity'), $attemptsreporturl,
            settings_navigation::TYPE_SETTING, '', 'attemptsreport');
    } else if ($manager->can_view_own_attempts() && $manager->count_attempts($USER->id)) {
        $attemptsreporturl = new moodle_url('/mod/h5pactivity/report.php',
            ['a' => $settingsnav->get_page()->cm->instance, 'userid' => $USER->id]);
        $h5pactivitynode->add(get_string('attempts_report', 'h5pactivity'), $attemptsreporturl,
            settings_navigation::TYPE_SETTING, '', 'attemptsreport');
    }
}

/**
 * Whether the activity is branded.
 * This information is used, for instance, to decide if a filter should be applied to the icon or not.
 *
 * @return bool True if the activity is branded, false otherwise.
 */
function h5pactivity_is_branded(): bool {
    return true;
}