new project stable version

lib/presentation/state/tariff_sheet_state.dart

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+import 'package:be_happy/domain/entities/payment_card.dart';
+
+import '../../domain/entities/tariff.dart';
+
+enum TariffSheetStatus { initial, loading, success, failure }
+
+class TariffSheetState {
+  final TariffSheetStatus status;
+  final List<Tariff> tariffs;
+  final String? errorMessage;
+  final PaymentCard? selectedCard;
+  final int userBalance;
+  final bool useBalance ;
+
+  TariffSheetState({
+    this.status = TariffSheetStatus.initial,
+    this.tariffs = const [],
+    this.selectedCard,
+    this.errorMessage,
+    this.userBalance = 0,
+    this.useBalance = false,
+  });
+
+  TariffSheetState copyWith({
+    TariffSheetStatus? status,
+    List<Tariff>? tariffs,
+    PaymentCard? selectedCard,
+    String? errorMessage,
+    int? userBalance,
+    bool? useBalance,
+
+  }) => TariffSheetState(
+    status: status ?? this.status,
+    tariffs: tariffs ?? this.tariffs,
+    selectedCard: selectedCard ?? this.selectedCard,
+    useBalance: useBalance ?? this.useBalance,
+    userBalance: userBalance ?? this.userBalance,
+    errorMessage: errorMessage ?? this.errorMessage,
+  );
+}