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<?php
/**
 * Fix the user_registration field.
 * In particular, for values which are NULL, set them to the date of the first edit
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @ingroup Maintenance
 */
require_once __DIR__ . '/Maintenance.php';
use MediaWiki\MediaWikiServices;
/**
 * Maintenance script that fixes the user_registration field.
 *
 * @ingroup Maintenance
 */
class FixUserRegistration extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Fix the user_registration field' );
        $this->setBatchSize( 1000 );
    }
    public function execute() {
        $dbw = $this->getDB( DB_MASTER );
        $lastId = 0;
        $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
        do {
            // Get user IDs which need fixing
            $res = $dbw->select(
                'user',
                'user_id',
                [
                    'user_id > ' . $dbw->addQuotes( $lastId ),
                    'user_registration IS NULL'
                ],
                __METHOD__,
                [
                    'LIMIT' => $this->getBatchSize(),
                    'ORDER BY' => 'user_id',
                ]
            );
            foreach ( $res as $row ) {
                $id = $row->user_id;
                $lastId = $id;
                // Get first edit time
                $actorQuery = ActorMigration::newMigration()
                    ->getWhere( $dbw, 'rev_user', User::newFromId( $id ) );
                $timestamp = $dbw->selectField(
                    [ 'revision' ] + $actorQuery['tables'],
                    'MIN(rev_timestamp)',
                    $actorQuery['conds'],
                    __METHOD__,
                    [],
                    $actorQuery['joins']
                );
                // Update
                if ( $timestamp !== null ) {
                    $dbw->update(
                        'user',
                        [ 'user_registration' => $timestamp ],
                        [ 'user_id' => $id ],
                        __METHOD__
                    );
                    $user = User::newFromId( $id );
                    $user->invalidateCache();
                    $this->output( "Set registration for #$id to $timestamp\n" );
                } else {
                    $this->output( "Could not find registration for #$id NULL\n" );
                }
            }
            $this->output( "Waiting for replica DBs..." );
            $lbFactory->waitForReplication();
            $this->output( " done.\n" );
        } while ( $res->numRows() >= $this->getBatchSize() );
    }
}
$maintClass = FixUserRegistration::class;
require_once RUN_MAINTENANCE_IF_MAIN;