import 'package:ulid/ulid.dart';

/// Typed ULID with prefix (e.g. `hb_01J9XYZ...`).
String generateUlid(String prefix) {
  if (prefix.isEmpty) {
    throw ArgumentError('prefix must be non-empty');
  }
  return '${prefix}_${Ulid().toString()}';
}

final RegExp _ulidRegex =
    RegExp(r'^[A-Za-z]{1,8}_[0-9A-HJKMNP-TV-Z]{26}$');

bool isValidUlid(String s) => _ulidRegex.hasMatch(s);