class AppException implements Exception {
  final String message;
  const AppException(this.message);

  @override
  String toString() => message;
}

class NetworkException extends AppException {
  const NetworkException(super.message);
}

class AuthException extends AppException {
  const AuthException(super.message);
}

class NotFoundException extends AppException {
  const NotFoundException(super.message);
}

/// 4xx/5xx response received from the server (excluding 401/404 which have
/// dedicated subclasses). Distinguished from `NetworkException` (connection
/// failure) so the offline write queue can drop non-retryable failures
/// instead of looping forever on a 422.
class ServerException extends AppException {
  final int statusCode;
  const ServerException(super.message, this.statusCode);
}