(function () {
  const replSetName = 'rs0';
  const replSetHost = 'box-mongodb:27017';
  const config = {
    _id: replSetName,
    members: [
      {
        _id: 0,
        host: replSetHost,
      },
    ],
  };

  function replicaSetIsReady() {
    try {
      const status = rs.status();
      return status && status.ok === 1;
    } catch (error) {
      print('Replica set status unavailable:', error.message);
      return false;
    }
  }

  if (!replicaSetIsReady()) {
    print('Initializing replica set', JSON.stringify(config));
    rs.initiate(config);
    let attempts = 0;
    while (attempts < 20) {
      let status;
      try {
        status = rs.status();
      } catch (error) {
        print('Replica set not ready yet:', error.message);
        sleep(1000);
        attempts += 1;
        continue;
      }

      if (status && status.ok === 1 && status.myState === 1) {
        print('Replica set is PRIMARY');
        break;
      }

      print('Waiting for PRIMARY (attempt', attempts + 1, ')');
      sleep(1000);
      attempts += 1;
    }
  } else {
    print('Replica set already initialized');
  }

  ['box_admin', 'box_stats'].forEach((dbName) => {
    const targetDb = db.getSiblingDB(dbName);
    const result = targetDb.runCommand({ ping: 1 });
    print('Ensured database ' + dbName + ':', tojson(result));
  });
})();