final sl = GetIt.instance;

Future<void> bootstrap() async {
  WidgetsFlutterBinding.ensureInitialized();

  // Singletons — one instance, shared across app
  sl.registerSingleton<SharedPreferences>(await SharedPreferences.getInstance());
  sl.registerSingleton<Logger>(initLogger());
  sl.registerSingleton<FlutterSecureStorage>(const FlutterSecureStorage());
  sl.registerSingleton<ApiClient>(ApiClient());

  // Lazy singletons — created on first access
  sl.registerLazySingleton(() => GlobalErrorCubit());
  sl.registerLazySingleton(() => ThemeCubit(sl()));
  sl.registerLazySingleton(() => LocalizationCubit(...));
  sl.registerLazySingleton(() => ConnectivityCubit(Connectivity()));

  // Feature DI — registered at bootstrap, lazy-loaded
  registerAuthDependencies();
  registerProfileDependencies();
  registerHomeDependencies();
  // ... all features
}

void registerProfileDependencies() {
  // Lazy singleton — one instance per app lifecycle
  sl.registerLazySingleton(() => ProfileDataSource(sl<ApiClient>()));
  sl.registerLazySingleton(() => ProfileStore(sl<ProfileDataSource>()));

  // Factory — new instance each time
  sl.registerFactory(() => ProfileCubit(sl<ProfileStore>()));
  sl.registerFactory(() => FollowCubit(sl<FollowStore>()));
}

class ProfileCubit extends Cubit<ProfileState> {
  final ProfileStore _store;

  ProfileCubit(this._store) : super(ProfileState.initial());

  Future<void> fetchMyProfile() async {
    emit(state.copyWith(userProfileResponse: state.userProfileResponse.loading));
    final result = await _store.getMyProfile();
    emit(state.copyWith(userProfileResponse: result));
  }
}