Add shopping cart functionality

workspace/src/main/java/com/microsoft/shinyay/ai/controller/ShoppingCartController.java

@@ -0,0 +1,37 @@
+package com.microsoft.shinyay.ai.controller;
+
+import com.microsoft.shinyay.ai.model.CartItem;
+import com.microsoft.shinyay.ai.model.Product;
+import com.microsoft.shinyay.ai.service.ShoppingCartService;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/cart")
+public class ShoppingCartController {
+
+    private final ShoppingCartService shoppingCartService;
+
+    public ShoppingCartController(ShoppingCartService shoppingCartService) {
+        this.shoppingCartService = shoppingCartService;
+    }
+
+    @PostMapping("/add")
+    public ResponseEntity<Void> addItemToCart(@RequestBody Product product, @RequestParam int quantity) {
+        shoppingCartService.addItemToCart(product, quantity);
+        return ResponseEntity.ok().build();
+    }
+
+    @GetMapping("/items")
+    public ResponseEntity<List<CartItem>> viewCartItems() {
+        return ResponseEntity.ok(shoppingCartService.getCartItems());
+    }
+
+    @DeleteMapping("/clear")
+    public ResponseEntity<Void> clearCart() {
+        shoppingCartService.clearCart();
+        return ResponseEntity.ok().build();
+    }
+}

workspace/src/main/java/com/microsoft/shinyay/ai/model/CartItem.java

@@ -0,0 +1,25 @@
+package com.microsoft.shinyay.ai.model;
+
+public class CartItem {
+    private Product product;
+    private int quantity;
+
+    public CartItem() {
+    }
+
+    public Product getProduct() {
+        return product;
+    }
+
+    public void setProduct(Product product) {
+        this.product = product;
+    }
+
+    public int getQuantity() {
+        return quantity;
+    }
+
+    public void setQuantity(int quantity) {
+        this.quantity = quantity;
+    }
+}

workspace/src/main/java/com/microsoft/shinyay/ai/model/Product.java

@@ -0,0 +1,43 @@
+package com.microsoft.shinyay.ai.model;
+
+public class Product {
+    private Long id;
+    private String name;
+    private String description;
+    private double price;
+
+    public Product() {
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public double getPrice() {
+        return price;
+    }
+
+    public void setPrice(double price) {
+        this.price = price;
+    }
+}

workspace/src/main/java/com/microsoft/shinyay/ai/service/ShoppingCartService.java

@@ -0,0 +1,38 @@
+package com.microsoft.shinyay.ai.service;
+
+import com.microsoft.shinyay.ai.model.CartItem;
+import com.microsoft.shinyay.ai.model.Product;
+import org.springframework.stereotype.Service;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+
+@Service
+public class ShoppingCartService {
+
+    private final List<CartItem> cartItems = new ArrayList<>();
+
+    public void addItemToCart(Product product, int quantity) {
+        Optional<CartItem> existingItem = cartItems.stream()
+                .filter(item -> item.getProduct().getId().equals(product.getId()))
+                .findFirst();
+
+        existingItem.ifPresentOrElse(item -> item.setQuantity(item.getQuantity() + quantity),
+                () -> cartItems.add(new CartItem(product, quantity)));
+    }
+
+    public List<CartItem> getCartItems() {
+        return cartItems;
+    }
+
+    public double calculateTotalPrice() {
+        return cartItems.stream()
+                .mapToDouble(item -> item.getProduct().getPrice() * item.getQuantity())
+                .sum();
+    }
+
+    public void clearCart() {
+        cartItems.clear();
+    }
+}

workspace/src/main/resources/static/css/cart.css

@@ -0,0 +1,49 @@
+/* Basic styling for the shopping cart page */
+.cart-container {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    padding: 20px;
+}
+
+.cart-header {
+    font-size: 24px;
+    margin-bottom: 20px;
+}
+
+.cart-items {
+    width: 100%;
+    border-collapse: collapse;
+}
+
+.cart-items th, .cart-items td {
+    text-align: left;
+    padding: 8px;
+    border-bottom: 1px solid #ddd;
+}
+
+.cart-summary {
+    margin-top: 20px;
+    align-self: flex-end;
+}
+
+.cart-summary h3 {
+    margin: 0;
+}
+
+.cart-actions {
+    margin-top: 20px;
+}
+
+.cart-actions button {
+    background-color: #4CAF50;
+    color: white;
+    padding: 10px 20px;
+    margin-right: 10px;
+    border: none;
+    cursor: pointer;
+}
+
+.cart-actions button:hover {
+    background-color: #45a049;
+}

workspace/src/main/resources/templates/cart.html

@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+    <meta charset="UTF-8">
+    <title>Shopping Cart</title>
+    <link rel="stylesheet" href="/css/cart.css">
+</head>
+<body>
+<div class="container">
+    <h2>Shopping Cart</h2>
+    <div th:if="${not #lists.isEmpty(cartItems)}">
+        <table>
+            <thead>
+            <tr>
+                <th>Product</th>
+                <th>Price</th>
+                <th>Quantity</th>
+                <th>Total</th>
+            </tr>
+            </thead>
+            <tbody>
+            <tr th:each="item : ${cartItems}">
+                <td th:text="${item.product.name}">Product Name</td>
+                <td th:text="${item.product.price}">Product Price</td>
+                <td th:text="${item.quantity}">Quantity</td>
+                <td th:text="${item.product.price * item.quantity}">Total</td>
+            </tr>
+            </tbody>
+        </table>
+        <div>
+            <h3>Total: <span th:text="${totalPrice}">Total Price</span></h3>
+        </div>
+    </div>
+    <div th:if="${#lists.isEmpty(cartItems)}">
+        <p>Your cart is empty.</p>
+    </div>
+    <div>
+        <form th:action="@{/cart/clear}" method="post">
+            <button type="submit">Clear Cart</button>
+        </form>
+    </div>
+</div>
+</body>
+</html>