import { ASTRALVIEW_SCHEMA_VERSION, type Screen } from './schema';

/**
 * Placeholder for future schema migrations.
 * Keep it pure and versioned.
 */
export function migrateScreen(input: unknown): Screen {
  const s = input as Partial<Screen>;
  if (!s || typeof s !== 'object') {
    throw new Error('Invalid screen: not an object');
  }
  const version = (s as Screen).version;
  if (version === ASTRALVIEW_SCHEMA_VERSION) {
    return s as Screen;
  }

  // Future: apply incremental migrations.
  throw new Error(`Unsupported screen version: ${String(version)}`);
}