<?php

declare(strict_types=1);

namespace DoctrineMigrations;

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

/**
 * Numbers the places of an assignment, for the n8n placements feed ("platz_id").
 *
 * Existing active placements are numbered 1..n per assignment in creation order; called-off ones
 * stay without a number, they hold no place. n8n has not seen a place number yet, so the initial
 * order is free to choose.
 *
 * Written by hand rather than taken from doctrine:migrations:diff, which also carries the
 * pre-existing drift of the dev database.
 */
final class Version20261106100000 extends AbstractMigration
{
    public function getDescription(): string
    {
        return 'Add disposition.slot and number the active placements per assignment';
    }

    public function up(Schema $schema): void
    {
        $this->addSql('ALTER TABLE disposition ADD slot SMALLINT DEFAULT NULL');
        $this->addSql(<<<'SQL'
            UPDATE disposition
            INNER JOIN (
                SELECT id, ROW_NUMBER() OVER (PARTITION BY assignment_id ORDER BY id) AS slot
                FROM disposition
                WHERE status <> 'called_off' AND assignment_id IS NOT NULL
            ) AS numbered ON numbered.id = disposition.id
            SET disposition.slot = numbered.slot
            SQL);
    }

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