<?php

declare(strict_types=1);

namespace DoctrineMigrations;

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

/**
 * Copies the library document onto the checklist row.
 *
 * The library holds what the next assignments get and is replaced from season to season, so
 * resolving it on read rewrote what an assignment that already exists - a finished one included -
 * hands out. The row carries its own reference from now on.
 *
 * The backfill maps every existing row to what it resolves to today, so nothing changes for the
 * rows that are already out there. ON DELETE SET NULL keeps a row readable when the library file
 * itself is deleted: "kein Dokument hinterlegt" is a state every view already handles.
 */
final class Version20260917140000 extends AbstractMigration
{
    public function getDescription(): string
    {
        return 'Give each season checklist row its own document reference';
    }

    public function up(Schema $schema): void
    {
        $this->addSql('ALTER TABLE season_assignment_task ADD document_id INT DEFAULT NULL');
        $this->addSql('ALTER TABLE season_assignment_task ADD CONSTRAINT FK_BEEB9D8DC33F7837 FOREIGN KEY (document_id) REFERENCES upload (id) ON DELETE SET NULL');
        $this->addSql('CREATE INDEX IDX_BEEB9D8DC33F7837 ON season_assignment_task (document_id)');

        $this->addSql('UPDATE season_assignment_task t JOIN season_task_document d ON d.task_key = t.task_key SET t.document_id = d.document_id');
    }

    public function down(Schema $schema): void
    {
        $this->addSql('ALTER TABLE season_assignment_task DROP FOREIGN KEY FK_BEEB9D8DC33F7837');
        $this->addSql('DROP INDEX IDX_BEEB9D8DC33F7837 ON season_assignment_task');
        $this->addSql('ALTER TABLE season_assignment_task DROP document_id');
    }
}