<?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/>.

/**
 * Upgrade code for install
 *
 * @package   mod_assign
 * @copyright 2012 NetSpot {@link http://www.netspot.com.au}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

/**
 * upgrade this assignment instance - this function could be skipped but it will be needed later
 * @param int $oldversion The old version of the assign module
 * @return bool
 */
function xmldb_assign_upgrade($oldversion) {
    global $CFG, $DB;

    $dbman = $DB->get_manager();


<     // Automatically generated Moodle v3.5.0 release upgrade line.
<     // Put any upgrade step following this.
< 


    // Automatically generated Moodle v3.6.0 release upgrade line.
    // Put any upgrade step following this.

    if ($oldversion < 2018120500) {
        // Define field hidegrader to be added to assign.
        $table = new xmldb_table('assign');
        $field = new xmldb_field('hidegrader', XMLDB_TYPE_INTEGER, '2', null, XMLDB_NOTNULL, null, '0', 'blindmarking');

        if (!$dbman->field_exists($table, $field)) {
            $dbman->add_field($table, $field);
        }

        // Assignment savepoint reached.
        upgrade_mod_savepoint(true, 2018120500, 'assign');
    }

    // Automatically generated Moodle v3.7.0 release upgrade line.
    // Put any upgrade step following this.

    // Automatically generated Moodle v3.8.0 release upgrade line.
    // Put any upgrade step following this.

    // Automatically generated Moodle v3.9.0 release upgrade line.
    // Put any upgrade step following this.


>     // Automatically generated Moodle v3.10.0 release upgrade line.
    return true;
>     // Put any upgrade step following this.
}
> 
>     // Automatically generated Moodle v3.11.0 release upgrade line.
>     // Put any upgrade step following this.
> 
>     if ($oldversion < 2021051701) {
>         // The most recent assign submission should always have latest = 1, we want to find all records where this is not the case.
>         // Find the records with the maximum timecreated for each assign and user combination where latest is also 0.
>         $sqluser = "SELECT s.id
>                       FROM {assign_submission} s
>                      WHERE s.timecreated = (
>                           SELECT  MAX(timecreated) timecreated
>                             FROM {assign_submission} sm
>                            WHERE s.assignment = sm.assignment
>                                  AND s.userid = sm.userid
>                                  AND sm.groupid = 0)
>                            AND s.groupid = 0
>                            AND s.latest = 0";
>         $idstofixuser = $DB->get_records_sql($sqluser, null);
> 
>         $sqlgroup = "SELECT s.id
>                        FROM {assign_submission} s
>                       WHERE s.timecreated = (
>                           SELECT  MAX(timecreated) timecreated
>                             FROM {assign_submission} sm
>                            WHERE s.assignment = sm.assignment
>                                  AND s.groupid = sm.groupid
>                                  AND sm.groupid <> 0)
>                             AND s.groupid <> 0
>                             AND s.latest = 0";
>         $idstofixgroup = $DB->get_records_sql($sqlgroup, null);
> 
>         $idstofix = array_merge(array_keys($idstofixuser), array_keys($idstofixgroup));
> 
>         if (count($idstofix)) {
>             [$insql, $inparams] = $DB->get_in_or_equal($idstofix);
>             $DB->set_field_select('assign_submission', 'latest', 1, "id $insql", $inparams);
>         }
> 
>         // Assignment savepoint reached.
>         upgrade_mod_savepoint(true, 2021051701, 'assign');
>     }