/**
 * Schema 4 → 3 (SQLite):
 * - Drops agentprinter table
 * - Removes enabled from printeragent
 * - Restores clientserial, clientmodel, clientstate in printeragent
 * @param {{ exec: (sql: string) => void, assertVersion: (v: number) => Promise<void>, setVersion: (v: number) => Promise<void> }} ctx
 */
export default async function downgrade({ exec, assertVersion, setVersion }) {
  await assertVersion(4);

  exec(`DROP TABLE IF EXISTS agentprinter;`);

  try {
    exec(`ALTER TABLE printeragent DROP COLUMN enabled;`);
  } catch {}
  try {
    exec(`ALTER TABLE printeragent ADD COLUMN clientserial TEXT;`);
  } catch {}
  try {
    exec(`ALTER TABLE printeragent ADD COLUMN clientmodel TEXT;`);
  } catch {}
  try {
    exec(`ALTER TABLE printeragent ADD COLUMN clientstate TEXT;`);
  } catch {}

  await setVersion(3);
}