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| 1 | <?php |
| 2 | // This file is part of Moodle - https://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 |
| 15 | // along with Moodle. If not, see <https://www.gnu.org/licenses/>. |
| 16 | |
| 17 | namespace local_recertify\local; |
| 18 | |
| 19 | use context_course; |
| 20 | use stdClass; |
| 21 | |
| 22 | /** |
| 23 | * Works out who expires, who needs a reminder, and where each learner stands. |
| 24 | * |
| 25 | * A certification expires a fixed number of days after the course was completed. Only learners |
| 26 | * with an active enrolment are reminded or reset. |
| 27 | * |
| 28 | * @package local_recertify |
| 29 | * @copyright 2026 DevLMS <contact@devlms.com> |
| 30 | * @license https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later |
| 31 | */ |
| 32 | final class schedule { |
| 33 | /** @var int Seconds in a day. */ |
| 34 | public const DAY = 86400; |
| 35 | |
| 36 | /** |
| 37 | * Learners whose certification has expired by $now. |
| 38 | * |
| 39 | * @param stdClass $cfg Course settings. |
| 40 | * @param int $now |
| 41 | * @return int[] User ids. |
| 42 | */ |
| 43 | public static function due_resets(stdClass $cfg, int $now): array { |
| 44 | $due = []; |
| 45 | foreach (self::completions($cfg) as $row) { |
| 46 | if ((int) $row->timecompleted + $cfg->perioddays * self::DAY <= $now) { |
| 47 | $due[] = (int) $row->userid; |
| 48 | } |
| 49 | } |
| 50 | return $due; |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * Reminders to send now. Each learner gets the nearest reminder that applies, so a learner |
| 55 | * already inside 7 days never gets the 30 day one late. |
| 56 | * |
| 57 | * @param stdClass $cfg |
| 58 | * @param int $now |
| 59 | * @return stdClass[] userid, timecompleted, daysbefore, expires |
| 60 | */ |
| 61 | public static function due_reminders(stdClass $cfg, int $now): array { |
| 62 | global $DB; |
| 63 | $days = settings::reminder_days($cfg); |
| 64 | $due = []; |
| 65 | foreach (self::completions($cfg) as $row) { |
| 66 | $expires = (int) $row->timecompleted + $cfg->perioddays * self::DAY; |
| 67 | if ($expires <= $now) { |
| 68 | continue; |
| 69 | } |
| 70 | $applies = array_filter($days, fn($d) => $expires - $d * self::DAY <= $now); |
| 71 | if (!$applies) { |
| 72 | continue; |
| 73 | } |
| 74 | $nearest = min($applies); |
| 75 | $sent = $DB->record_exists('local_recertify_notice', ['courseid' => $cfg->courseid, 'userid' => $row->userid, |
| 76 | 'timecompleted' => $row->timecompleted, 'daysbefore' => $nearest]); |
| 77 | if (!$sent) { |
| 78 | $due[] = (object) ['userid' => (int) $row->userid, 'timecompleted' => (int) $row->timecompleted, |
| 79 | 'daysbefore' => $nearest, 'expires' => $expires]; |
| 80 | } |
| 81 | } |
| 82 | return $due; |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * Record a reminder as sent, along with every earlier one it replaces. |
| 87 | * |
| 88 | * @param stdClass $cfg |
| 89 | * @param stdClass $reminder From due_reminders(). |
| 90 | * @param int $now |
| 91 | */ |
| 92 | public static function mark_reminded(stdClass $cfg, stdClass $reminder, int $now): void { |
| 93 | global $DB; |
| 94 | foreach (settings::reminder_days($cfg) as $days) { |
| 95 | $key = ['courseid' => $cfg->courseid, 'userid' => $reminder->userid, |
| 96 | 'timecompleted' => $reminder->timecompleted, 'daysbefore' => $days]; |
| 97 | if ($days >= $reminder->daysbefore && !$DB->record_exists('local_recertify_notice', $key)) { |
| 98 | $DB->insert_record('local_recertify_notice', (object) ($key + ['timesent' => $now])); |
| 99 | } |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * Where a learner stands: valid, expiring (inside the first reminder), expired (reset, not yet |
| 105 | * completed again) or none. |
| 106 | * |
| 107 | * @param stdClass $cfg |
| 108 | * @param int $userid |
| 109 | * @param int $now |
| 110 | * @return stdClass state, timecompleted, expires, certifications (past ones on record) |
| 111 | */ |
| 112 | public static function status(stdClass $cfg, int $userid, int $now): stdClass { |
| 113 | global $DB; |
| 114 | $past = $DB->count_records('local_recertify_history', ['courseid' => $cfg->courseid, 'userid' => $userid]); |
| 115 | $timecompleted = (int) $DB->get_field( |
| 116 | 'course_completions', |
| 117 | 'timecompleted', |
| 118 | ['course' => $cfg->courseid, 'userid' => $userid] |
| 119 | ); |
| 120 | if ($timecompleted) { |
| 121 | $expires = $timecompleted + $cfg->perioddays * self::DAY; |
| 122 | $window = (settings::reminder_days($cfg)[0] ?? 30) * self::DAY; |
| 123 | $state = $expires <= $now ? 'expired' : ($expires - $window <= $now ? 'expiring' : 'valid'); |
| 124 | return (object) ['state' => $state, 'timecompleted' => $timecompleted, 'expires' => $expires, |
| 125 | 'certifications' => $past]; |
| 126 | } |
| 127 | return (object) ['state' => $past ? 'expired' : 'none', 'timecompleted' => 0, 'expires' => 0, |
| 128 | 'certifications' => $past]; |
| 129 | } |
| 130 | |
| 131 | /** |
| 132 | * Course completions of learners with an active enrolment, oldest first. |
| 133 | * |
| 134 | * @param stdClass $cfg |
| 135 | * @return stdClass[] userid, timecompleted |
| 136 | */ |
| 137 | private static function completions(stdClass $cfg): array { |
| 138 | global $DB; |
| 139 | $context = context_course::instance($cfg->courseid); |
| 140 | $rows = $DB->get_records_select( |
| 141 | 'course_completions', |
| 142 | 'course = ? AND timecompleted > 0', |
| 143 | [$cfg->courseid], |
| 144 | 'timecompleted ASC, id ASC', |
| 145 | 'id, userid, timecompleted' |
| 146 | ); |
| 147 | return array_values(array_filter($rows, fn($r) => is_enrolled($context, $r->userid, '', true))); |
| 148 | } |
| 149 | } |