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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_doublemark\local; |
| 18 | |
| 19 | /** |
| 20 | * Turns two independent marks into a status and, when the rule allows, an agreed mark. |
| 21 | * |
| 22 | * Pure logic, no database: the store and the pages build on it. |
| 23 | * |
| 24 | * @package local_doublemark |
| 25 | * @copyright 2026 DevLMS <contact@devlms.com> |
| 26 | * @license https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later |
| 27 | */ |
| 28 | final class reconciler { |
| 29 | /** One or both marks are still missing. */ |
| 30 | public const MARKING = 'marking'; |
| 31 | /** Both marks are in and the rule settled the agreed mark. */ |
| 32 | public const AGREED = 'agreed'; |
| 33 | /** Both marks are in and the lead has to decide. */ |
| 34 | public const RECONCILE = 'reconcile'; |
| 35 | |
| 36 | /** Agreed mark is the mean of the two. */ |
| 37 | public const AVERAGE = 'average'; |
| 38 | /** Agreed mark is the higher of the two. */ |
| 39 | public const HIGHER = 'higher'; |
| 40 | /** Agreed mark is the first marker's. */ |
| 41 | public const FIRST = 'first'; |
| 42 | /** The lead always decides. */ |
| 43 | public const LEAD = 'lead'; |
| 44 | |
| 45 | /** @var string[] Every rule, in the order the settings list them. */ |
| 46 | public const RULES = [self::AVERAGE, self::HIGHER, self::FIRST, self::LEAD]; |
| 47 | |
| 48 | /** |
| 49 | * Status and agreed mark for a pair of marks. |
| 50 | * |
| 51 | * @param float|null $first First marker's mark, null when missing. |
| 52 | * @param float|null $second Second marker's mark, null when missing. |
| 53 | * @param float $tolerance Largest gap that still counts as agreement, in grade points (inclusive). |
| 54 | * @param string $rule One of RULES. |
| 55 | * @return array [status, agreed mark or null] |
| 56 | */ |
| 57 | public static function resolve(?float $first, ?float $second, float $tolerance, string $rule): array { |
| 58 | if (!in_array($rule, self::RULES, true)) { |
| 59 | throw new \coding_exception("Unknown agreement rule '$rule'"); |
| 60 | } |
| 61 | if ($first === null || $second === null) { |
| 62 | return [self::MARKING, null]; |
| 63 | } |
| 64 | // Compare in hundredths so float noise cannot turn an exact gap into a disagreement. |
| 65 | $gap = abs((int) round($first * 100) - (int) round($second * 100)); |
| 66 | if ($rule === self::LEAD || $gap > (int) round($tolerance * 100)) { |
| 67 | return [self::RECONCILE, null]; |
| 68 | } |
| 69 | $agreed = match ($rule) { |
| 70 | self::AVERAGE => round(($first + $second) / 2, 2), |
| 71 | self::HIGHER => max($first, $second), |
| 72 | self::FIRST => $first, |
| 73 | }; |
| 74 | return [self::AGREED, $agreed]; |
| 75 | } |
| 76 | } |