Merge remote-tracking branch 'origin/server_side_template' into server_side_template

src/main/java/edu/neu/neumall/controller/ShoppingCartController.java

@@ -6,8 +6,7 @@ import edu.neu.neumall.entity.User;
 import org.springframework.security.core.annotation.AuthenticationPrincipal;
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
-import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.*;
 
 import java.util.ArrayList;
 import java.util.HashSet;
@@ -26,4 +25,13 @@ public class ShoppingCartController {
 
         return "cart.html";
     }
+
+    @PostMapping("/add")
+    @ResponseBody
+    public String appendShoppingCart(@RequestParam long productID, @RequestParam int count,
+                                     @AuthenticationPrincipal User user) {
+        ShoppingCart item = new ShoppingCart();
+
+        return "";
+    }
 }

src/main/java/edu/neu/neumall/service/OrderService.java

@@ -125,4 +125,8 @@ public class OrderService {
         return order;
     }
 
+    public void save(Order order) {
+        orderRepository.save(order);
+    }
+
 }

src/main/java/edu/neu/neumall/service/SettleService.java

@@ -1,17 +1,70 @@
 package edu.neu.neumall.service;
 
+import edu.neu.neumall.entity.Order;
+import edu.neu.neumall.entity.Product;
 import edu.neu.neumall.entity.ShoppingCart;
 import edu.neu.neumall.entity.User;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
+import java.util.ArrayList;
 import java.util.List;
 
 @Service
 public class SettleService {
-    public void Purchase(User user, List<ShoppingCart> shoppingCart) {
+
+    private ProductService productService;
+    private OrderService orderService;
+
+    @Autowired
+    public SettleService(ProductService productService,
+                         OrderService orderService) {
+        this.productService = productService;
+        this.orderService = orderService;
+    }
+
+    public boolean Purchase(User user, List<ShoppingCart> shoppingCart) {
+        if (!canPurchase(shoppingCart)) {
+            return false;
+        }
+        ArrayList<Product> products = new ArrayList<>();
+        for (var item : shoppingCart) {
+            var targetProductID = item.getProduct().getID();
+            var productOptional = productService.getProductByID(targetProductID);
+            if (productOptional.isEmpty()) {
+                return false;
+            }
+            // reset product's count
+            var product = productOptional.get();
+            product.setCount(product.getCount() - item.getCount());
+            productService.save(product);
+
+            // add a order record
+            Order record = new Order();
+            record.setCount(item.getCount());
+            record.setOwner(item.getOwner());
+            record.setProduct(item.getProduct());
+            record.setPrice(product.getPrice());
+            record.setType(Order.OrderType.PURCHASE);
+            orderService.save(record);
+        }
+        return true;
+    }
+
+    private boolean isShoppingCartItemValid(ShoppingCart shoppingCart) {
+        var product = shoppingCart.getProduct();
+        if (product.getCount() < shoppingCart.getCount()) {
+            return false;
+        }
+        return true;
     }
 
     private boolean canPurchase(List<ShoppingCart> shoppingCarts) {
-        return false;
+        for (var item : shoppingCarts) {
+            if (!isShoppingCartItemValid(item)) {
+                return false;
+            }
+        }
+        return true;
     }
 }

src/main/java/edu/neu/neumall/service/ShoppingCartService.java

@@ -0,0 +1,36 @@
+package edu.neu.neumall.service;
+
+import edu.neu.neumall.entity.Order;
+import edu.neu.neumall.entity.Product;
+import edu.neu.neumall.entity.ShoppingCart;
+import edu.neu.neumall.entity.User;
+import edu.neu.neumall.repository.ProductRepository;
+import edu.neu.neumall.repository.ShoppingCartRepository;
+import org.springframework.stereotype.Service;
+
+@Service
+public class ShoppingCartService {
+    private ShoppingCartRepository shoppingCartRepository;
+    private ProductRepository productRepository;
+
+    public ShoppingCartService(ShoppingCartRepository shoppingCartRepository,
+                               ProductRepository productRepository) {
+        this.shoppingCartRepository = shoppingCartRepository;
+        this.productRepository = productRepository;
+    }
+
+    public boolean addShoppingCartItem(long productID, int count, User user) {
+        var productOptional = productRepository.findById(productID);
+        if (productOptional.isEmpty()) {
+            return false;
+        }
+        var product = productOptional.get();
+        ShoppingCart shoppingCart = new ShoppingCart();
+        shoppingCart.setCount(count);
+        shoppingCart.setProduct(product);
+        shoppingCart.setOwner(user);
+        shoppingCartRepository.save(shoppingCart);
+        return true;
+    }
+
+}