// Import types
import CollectionOpts from '../types/CollectionOpts';

// Import constants
import DEFAULT_LOCK_TTL_MS from '../constants/DEFAULT_LOCK_TTL_MS';

/**
 * Helper for initializing the lock collection.
 * For unifying construction of lock-collections (for testing).
 * @author Benedikt Arnarsson
 * @param ttlMS the time to live (in ms) of the locks in the collection.
 * @returns the options used to construct a collections corresponding lock-collection.
 */
const getLockCollectionOpts = (ttlMS?: number): CollectionOpts => {
  return {
    expireAfterSeconds: (
      ttlMS
        ? ttlMS / 1000
        : DEFAULT_LOCK_TTL_MS / 1000
    ),
    uniqueIndexKey: 'id',
    indexKeys: [
      'serverId',
    ],
  };
};

export default getLockCollectionOpts;