import type Database from 'better-sqlite3';

/** Replace the old opt-in default while preserving an existing nonempty selection. */
export function migrateDiscordPublicationDefaults(handle: Database.Database): void {
    const row = handle.prepare('SELECT value FROM discord_configuration WHERE id=1').get() as
        { value: string } | undefined;
    if (!row) return;
    const settings = JSON.parse(row.value) as Record<string, unknown>;
    if ('excludedServers' in settings) return;
    const published = new Set(settings.publishedServers as string[]);
    settings.excludedServers = published.size
        ? (
              handle
                  .prepare('SELECT name FROM servers WHERE destroyed_at IS NULL ORDER BY name')
                  .all() as { name: string }[]
          )
              .map((server) => server.name)
              .filter((name) => !published.has(name))
        : [];
    delete settings.publishedServers;
    handle
        .prepare('UPDATE discord_configuration SET value=? WHERE id=1')
        .run(JSON.stringify(settings));
}