/**
 * Validates a record key (rkey)
 * @param rkey - Record key to validate
 * @throws {InvalidRecordKeyError} if the record key is invalid
 */
export const ensureValidRecordKey = (rkey: string): void => {
  if (rkey.length > 512 || rkey.length < 1) {
    throw new InvalidRecordKeyError("record key must be 1 to 512 characters");
  }
  // simple regex to enforce most constraints via just regex and length.
  if (!/^[a-zA-Z0-9_~.:-]{1,512}$/.test(rkey)) {
    throw new InvalidRecordKeyError("record key syntax not valid (regex)");
  }
  if (rkey === "." || rkey === "..") {
    throw new InvalidRecordKeyError("record key can not be '.' or '..'");
  }
};

/**
 * Validates a record key (rkey) to a boolean
 * @param rkey - Record key to validate
 * @returns true if the record key is valid, false otherwise
 */
export const isValidRecordKey = (rkey: string): boolean => {
  try {
    ensureValidRecordKey(rkey);
  } catch (err) {
    if (err instanceof InvalidRecordKeyError) {
      return false;
    }
    throw err;
  }

  return true;
};

export class InvalidRecordKeyError extends Error {}