(function () {
  const rsName = 'rs0';
  const host = 'box-mongodb:27017';

  const j = (x) => {
    try {
      return JSON.stringify(x);
    } catch (e) {
      return String(x);
    }
  };

  try {
    const st = rs.status();
    if (st && st.ok === 1) {
      print('[init-rs] Replica set already initialized. ok=1');
      quit(0);
    }
  } catch (e) {
    // not initialized yet => continue
  }

  const cfg = { _id: rsName, members: [{ _id: 0, host }] };

  try {
    const res = rs.initiate(cfg);
    print('[init-rs] rs.initiate:', j(res));
  } catch (e) {
    print('[init-rs] rs.initiate error:', String(e));
  }

  // wait for ok
  for (let i = 0; i < 60; i++) {
    try {
      const st2 = rs.status();
      if (st2 && st2.ok === 1) {
        print('[init-rs] Replica set OK. status:', j(st2));
        quit(0);
      }
    } catch (e) {}
    sleep(1000);
  }

  print('[init-rs] Replica set NOT OK after timeout');
  quit(1);
})();