<?php

declare(strict_types=1);

namespace DoctrineMigrations;

use Doctrine\DBAL\Schema\Schema;
use Doctrine\Migrations\AbstractMigration;

/**
 * Auto-generated Migration: Please modify to your needs!
 */
final class Version20260915151210 extends AbstractMigration
{
    public function getDescription(): string
    {
        return 'Add artwork.position for the drag-to-reorder gallery, backfilled by upload date';
    }

    public function up(Schema $schema): void
    {
        $this->addSql('ALTER TABLE artwork ADD position INT NOT NULL DEFAULT 0');

        // Backfill existing rows so the gallery keeps its current (upload-date) order
        // until someone drags a piece; new uploads get their position in PHP.
        $this->addSql(<<<'SQL'
            UPDATE artwork a
            JOIN (
                SELECT id, ROW_NUMBER() OVER (ORDER BY uploaded_at ASC, id ASC) AS rn
                FROM artwork
            ) ranked ON ranked.id = a.id
            SET a.position = ranked.rn
            SQL);

        // Drop the bootstrap default now that every row has a real position;
        // the mapping has no default, so schema:validate expects none either.
        $this->addSql('ALTER TABLE artwork CHANGE position position INT NOT NULL');
    }

    public function down(Schema $schema): void
    {
        $this->addSql('ALTER TABLE artwork DROP position');
    }
}