syncrow-web/lib/services/api/network_exception.dart

import 'package:dio/dio.dart';

abstract class Failure {
  final String errMessage;

  Failure(this.errMessage);
}

class ServerFailure extends Failure {
  ServerFailure(super.errMessage);

  @override
  String toString() {
    return errMessage;
  }

  factory ServerFailure.fromDioError(DioException dioError) {
    switch (dioError.type) {
      case DioExceptionType.connectionTimeout:
        return ServerFailure('Connection timeout with the Server.');
      case DioExceptionType.sendTimeout:
        return ServerFailure('Send timeout with the Server.');

      case DioExceptionType.receiveTimeout:
        return ServerFailure('Receive timeout with the Server.');

      case DioExceptionType.badCertificate:
        return ServerFailure('Bad certificate!');

      case DioExceptionType.badResponse:
        {
          // var document = parser.parse(dioError.response!.data.toString());
          // var message = document.body!.text;
          return ServerFailure.fromResponse(dioError.response!.statusCode,
              dioError.response?.data['message'] ?? 'Error');
        }
      case DioExceptionType.cancel:
        return ServerFailure('The request to ApiServer was canceled');

      case DioExceptionType.connectionError:
        return ServerFailure('No Internet Connection');

      case DioExceptionType.unknown:
        return ServerFailure('Unexpected Error, Please try again!');

      default:
        return ServerFailure('Unexpected Error, Please try again!');
    }
  }

  factory ServerFailure.fromResponse(int? statusCode, dynamic responseMessage) {
    switch (statusCode) {
      case 401:
      case 403:
        return ServerFailure(responseMessage);
      case 400:
        final errors = <String>[];
        if (responseMessage is List) {
          for (final error in responseMessage) {
            errors.add(error);
          }
        } else {
          return ServerFailure(responseMessage);
        }
        return ServerFailure(errors.join('\n'));
      case 404:
        return ServerFailure('');
      case 500:
        return ServerFailure(responseMessage);
      default:
        return ServerFailure('Opps there was an Error, Please try again!');
    }
  }
}