class AppException implements Exception {
  final String message;
  final String prefix;

  AppException([this.message = 'An unknown error occurred.', this.prefix = '']);

  @override
  String toString() {
    return '$prefix$message';
  }
}

class FetchDataException extends AppException {
  FetchDataException([String? message])
    : super(message ?? 'Error During Communication: ', 'Network Error');
}

class AuthenticationException extends AppException {
  AuthenticationException([String? message])
    : super(message ?? 'Authentication Failed.', 'Auth Error');
}