runable

lib/features/home/domain/entities/cart_item.dart

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+import 'package:equatable/equatable.dart';
+
+/// Cart item domain entity
+class CartItem extends Equatable {
+  final String productId;
+  final String productName;
+  final double price;
+  final int quantity;
+  final String? imageUrl;
+  final DateTime addedAt;
+
+  const CartItem({
+    required this.productId,
+    required this.productName,
+    required this.price,
+    required this.quantity,
+    this.imageUrl,
+    required this.addedAt,
+  });
+
+  double get total => price * quantity;
+
+  CartItem copyWith({
+    String? productId,
+    String? productName,
+    double? price,
+    int? quantity,
+    String? imageUrl,
+    DateTime? addedAt,
+  }) {
+    return CartItem(
+      productId: productId ?? this.productId,
+      productName: productName ?? this.productName,
+      price: price ?? this.price,
+      quantity: quantity ?? this.quantity,
+      imageUrl: imageUrl ?? this.imageUrl,
+      addedAt: addedAt ?? this.addedAt,
+    );
+  }
+
+  @override
+  List<Object?> get props => [
+        productId,
+        productName,
+        price,
+        quantity,
+        imageUrl,
+        addedAt,
+      ];
+}

lib/features/home/domain/repositories/cart_repository.dart

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+import 'package:dartz/dartz.dart';
+import '../../../../core/errors/failures.dart';
+import '../entities/cart_item.dart';
+
+/// Cart repository interface
+abstract class CartRepository {
+  /// Get all cart items
+  Future<Either<Failure, List<CartItem>>> getCartItems();
+  
+  /// Add item to cart
+  Future<Either<Failure, void>> addToCart(CartItem item);
+  
+  /// Update cart item quantity
+  Future<Either<Failure, void>> updateQuantity(String productId, int quantity);
+  
+  /// Remove item from cart
+  Future<Either<Failure, void>> removeFromCart(String productId);
+  
+  /// Clear all cart items
+  Future<Either<Failure, void>> clearCart();
+}

lib/features/home/domain/usecases/add_to_cart.dart

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+import 'package:dartz/dartz.dart';
+import '../../../../core/errors/failures.dart';
+import '../entities/cart_item.dart';
+import '../repositories/cart_repository.dart';
+
+/// Use case to add item to cart
+class AddToCart {
+  final CartRepository repository;
+
+  AddToCart(this.repository);
+
+  Future<Either<Failure, void>> call(CartItem item) async {
+    return await repository.addToCart(item);
+  }
+}

lib/features/home/domain/usecases/calculate_total.dart

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+import '../entities/cart_item.dart';
+
+/// Use case to calculate cart total
+class CalculateTotal {
+  double call(List<CartItem> items) {
+    return items.fold(0.0, (sum, item) => sum + item.total);
+  }
+}

lib/features/home/domain/usecases/clear_cart.dart

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+import 'package:dartz/dartz.dart';
+import '../../../../core/errors/failures.dart';
+import '../repositories/cart_repository.dart';
+
+/// Use case to clear cart
+class ClearCart {
+  final CartRepository repository;
+
+  ClearCart(this.repository);
+
+  Future<Either<Failure, void>> call() async {
+    return await repository.clearCart();
+  }
+}

lib/features/home/domain/usecases/remove_from_cart.dart

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+import 'package:dartz/dartz.dart';
+import '../../../../core/errors/failures.dart';
+import '../repositories/cart_repository.dart';
+
+/// Use case to remove item from cart
+class RemoveFromCart {
+  final CartRepository repository;
+
+  RemoveFromCart(this.repository);
+
+  Future<Either<Failure, void>> call(String productId) async {
+    return await repository.removeFromCart(productId);
+  }
+}