fix

lib/presentation/viewmodel/top_up_bloc.dart

@@ -18,9 +18,10 @@ class TopUpBloc extends Bloc<TopUpEvent, TopUpState> {
     required this.getCertificatesUsecase,
     required this.purchaseCertificateUsecase,
     required this.getUserCards,
-  }) : super(TopUpState(isLoading: true)) {
+  }) : super(const TopUpLoading()) {
+
     on<LoadTopUpData>((event, emit) async {
-      emit(state.copyWith(isLoading: true));
+      emit(const TopUpLoading());
 
       final results = await Future.wait([
         getCertificatesUsecase(),
@@ -33,64 +34,68 @@ class TopUpBloc extends Bloc<TopUpEvent, TopUpState> {
       switch ((certResult, cardResult)) {
         case (Success(data: final certs), Success(data: final cards)):
           emit(
-            state.copyWith(
-              certificates: certs,
-              cards: cards,
-              selectedTariff: certs!.length > 1
+            TopUpLoaded(
+              certificates: certs ?? [],
+              cards: cards ?? [],
+              selectedTariff: certs != null && certs.length > 1
                   ? certs[1]
-                  : (certs.isNotEmpty ? certs.first : null),
-
-              selectedCard: cards!.isEmpty
+                  : (certs != null && certs.isNotEmpty ? certs.first : null),
+              selectedCard: cards == null || cards.isEmpty
                   ? null
                   : cards.firstWhere(
-                      (c) => c.isMain,
-                      orElse: () => cards.first,
-                    ),
-              isLoading: false,
+                    (c) => c.isMain,
+                orElse: () => cards.first,
+              ),
             ),
           );
-
-        case (
-          Success<List<Certificate>>(data: null),
-          Failure<List<PaymentCard>>(),
-        ):
-          // TODO: Handle this case.
-          throw UnimplementedError();
-        case (
-          Success<List<Certificate>>(data: [...]),
-          Failure<List<PaymentCard>>(),
-        ):
-          // TODO: Handle this case.
-          throw UnimplementedError();
-        case (Failure<List<Certificate>>(), _):
-          // TODO: Handle this case.
-          throw UnimplementedError();
+        default:
+          emit(const TopUpPaymentFailure('Не удалось загрузить данные'));
       }
     });
-    on<SelectCertificate>(
-      (event, emit) => emit(state.copyWith(selectedTariff: event.certificate)),
-    );
-    on<SelectCard>(
-      (event, emit) => emit(state.copyWith(selectedCard: event.card)),
-    );
-    on<ToggleAgreement>(
-      (event, emit) => emit(state.copyWith(isAgreed: event.value)),
-    );
+
+    on<SelectCertificate>((event, emit) {
+      if (state is TopUpLoaded) {
+        final currentState = state as TopUpLoaded;
+        emit(currentState.copyWith(selectedTariff: event.certificate));
+      }
+    });
+
+    on<SelectCard>((event, emit) {
+      if (state is TopUpLoaded) {
+        final currentState = state as TopUpLoaded;
+        emit(currentState.copyWith(selectedCard: event.card));
+      }
+    });
+
+    on<ToggleAgreement>((event, emit) {
+      if (state is TopUpLoaded) {
+        final currentState = state as TopUpLoaded;
+        emit(currentState.copyWith(isAgreed: event.value));
+      }
+    });
+
     on<TopUpButtonPressed>((event, emit) async {
-      emit(state.copyWith(isLoading: true));
+      if (state is TopUpLoaded) {
+        final currentState = state as TopUpLoaded;
 
-      if (state.isAgreed) {
-        final result = await purchaseCertificateUsecase(
-          certificateId: state.selectedTariff!.id,
-          cardId:state.selectedCard!.id,
-        );
+        if (currentState.isAgreed &&
+            currentState.selectedTariff != null &&
+            currentState.selectedCard != null) {
 
-        if (result is Success) {
-          emit(state.copyWith(isLoading: false));
+          emit(currentState.copyWith(isProcessingPayment: true));
+
+          final result = await purchaseCertificateUsecase(
+            certificateId: currentState.selectedTariff!.id,
+            cardId: currentState.selectedCard!.id,
+          );
+
+          if (result is Success) {
+            emit(const TopUpPaymentSuccess());
+          } else {
+            emit(const TopUpPaymentFailure('Ошибка при оплате'));
+          }
         }
       }
-
-
     });
   }
-}
+}