service_cubit.dart

import 'package:flutter_bloc/flutter_bloc.dart';

// Here we have the complex shopify logic that only works with the correct credentials
class MyService {
  Future<bool> signIn(String email, String password) async {
    // Contains complex API implementation stuff
    await Future.delayed(const Duration(seconds: 2));
    return true;
  }
}

// Here we have a fake implementation
class MyFakeService extends MyService {
  @override
  Future<bool> signIn(String email, String password) async {
    // Our fake implementation
    await Future.delayed(const Duration(seconds: 2));
    return false;
  }
}

sealed class MyState {}

class MyInitial extends MyState {}

class MyLoading extends MyState {}

class MySuccess extends MyState {}

class MyCubit extends Cubit<MyState> {
  final MyService service;
  MyCubit(this.service) : super(MyInitial());

  Future<void> signIn(String email, String password) async {
    emit(MyLoading());
    final result = await service.signIn(email, password);
    if (result) {
      emit(MySuccess());
    } else {
      emit(MyInitial());
    }
  }
}