implement service classes

src/main/java/dev/service/AuthService.java

@@ -1,23 +1,63 @@
 package dev.service;
 
+import dev.dao.UserDao;
 import dev.model.User;
 
+import java.util.Objects;
+
 public class AuthService {
 
+    private final UserDao userDao = new UserDao();
+
     public boolean register(String username, String password, String email) {
 
-        // TODO:
+        if (!isValidEmail(email)){
-        // Validate and register user
+            System.err.println("Invalid email address.");
+            return false;
+        }
+        User user = new User(
+                username,
+                String.valueOf(password.hashCode()),
+                email
+        );
 
+        if (userDao.save(user)){
+            System.out.println("Successfully registered user");
+            return true;
+        }
         return false;
     }
 
     public User login(String username, String password) {
 
-        // TODO:
+        User dbUser = userDao.findByUsername(username);
-        // Authenticate user
+
+        if (dbUser == null){
+            return null;
+        }
+
+        String dbUserPasswordHash = dbUser.getPasswordHash();
+
+        if (Objects.equals(dbUserPasswordHash,
+                String.valueOf(password.hashCode()))){
+            return dbUser;
+        }
 
         return null;
     }
 
+
+    public boolean isValidEmail(String email) {
+        if (email == null || email.isBlank()) {
+            return true;
+        }
+
+        int atIndex = email.indexOf('@');
+        if (atIndex <= 0) return false;
+        int dotIndex = email.lastIndexOf('.');
+        if (dotIndex <= atIndex + 1) return false;
+        if (dotIndex == email.length() - 1) return false;
+
+        return true;
+    }
 }

src/main/java/dev/service/MenuService.java

@@ -1,11 +1,77 @@
 package dev.service;
 
+import dev.dao.MenuItemDao;
+import dev.model.MenuItem;
+import dev.model.User;
+
+import java.util.List;
+import java.util.Scanner;
+
 public class MenuService {
 
+    public static final MenuItemDao menuItemDao = new MenuItemDao();
+
     public void showMenu() {
 
-        // TODO:
+        List<MenuItem> items = menuItemDao.findAll();
-        // Display menu items
+
+        System.out.println("=======================");
+        System.out.println("==       MENU        ==");
+        System.out.println("=======================");
+
+        for (MenuItem item : items) {
+
+            System.out.format("[%d] %s - $%.2f\n%s\nCategory: %s\n",
+                    item.getId(),
+                    item.getName(),
+                    item.getPrice(),
+                    item.getDescription(),
+                    item.getCategory()
+            );
+        }
+
+    }
+
+    public void ShowPanel(User user) {
+
+        OrderService orderService = new OrderService();
+
+        while (true) {
+
+            System.out.println("=======================");
+            System.out.println("==      WELCOME      ==");
+            System.out.println("=======================");
+            System.out.println("""
+                1.Place order
+                2.Order history
+                3.Logout
+                """);
+
+
+            Scanner scanner = new Scanner(System.in);
+
+            int choice = scanner.nextInt();
+
+            switch (choice) {
+
+                case 1: {
+                    orderService.placeOrder(user.getId());
+                    break;
+                }
+                case 2: {
+
+                    orderService.showOrderHistory(user.getId());
+                    break;
+                }
+                case 3: {
+                    System.out.println("goodbye, " + user.getUsername());
+                   return;
+                }
+                default:{
+                    System.out.println("invalid choice.enter a number between [1,3]");
+                }
+            }
+        }
 
     }
 

src/main/java/dev/service/OrderService.java

@@ -1,26 +1,169 @@
 package dev.service;
 
+import dev.dao.OrderDao;
+import dev.dao.OrderDetailDao;
+import dev.model.CartItem;
+import dev.model.MenuItem;
+import dev.model.Order;
+import dev.model.OrderDetail;
+
+import java.awt.*;
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Scanner;
+
 public class OrderService {
 
+    private final static OrderDetailDao orderDetailDao = new OrderDetailDao();
+    private final static OrderDao orderDao = new OrderDao();
+    private final static MenuService menuService = new MenuService();
+    private final static Scanner scanner = new Scanner(System.in);
+
     public void placeOrder(int userId) {
 
-        // TODO:
+        List<CartItem> cart = buildCart(scanner);
-        // Create order
+
+        if (cart == null || cart.isEmpty()) {
+            System.err.println("The cart is empty. Order placement aborted.");
+            return;
+        }
+
+        double totalPrice = 0;
+
+        for (CartItem cartItem: cart) {
+            totalPrice += cartItem.getSubtotal();
+        }
+
+        Order order = new Order();
+        order.setUserId(userId);
+        order.setCreatedAt(LocalDateTime.now());
+        order.setTotalPrice(totalPrice);
+
+        int orderId = orderDao.save(order);
+
+        if (orderId == -1) {
+            System.err.println("Order could not be placed (Database error).");
+            return;
+        }
+
+        order.setId(orderId);
+
+        for (CartItem cartItem : cart){
+            OrderDetail orderDetail = new OrderDetail();
+            orderDetail.setOrderId(orderId);
+            orderDetail.setMenuItemId( cartItem.getItem().getId());
+            orderDetail.setQuantity(cartItem.getQuantity());
+            orderDetail.setPrice(cartItem.getItem().getPrice());
+
+            orderDetailDao.save(orderDetail);
+        }
+
+        printReceipt(orderId);
+        System.out.println("Order saved successfully.");
 
     }
 
     public void printReceipt(int orderId) {
 
-        // TODO:
+        List<OrderDetail> details = orderDetailDao.findByOrderId(orderId);
-        // Print order receipt
 
+        System.out.println("\n--- order receipt: " + orderId + " ---");
+        System.out.printf("%-15s %-5s %-10s%n", "name", "quantity", "totalPrice");
+
+        double total = 0;
+        for (OrderDetail d : details) {
+            MenuItem item = MenuService.menuItemDao.findById(d.getMenuItemId());
+            double sub = d.getPrice() * d.getQuantity();
+            total += sub;
+            System.out.printf("%-15s %-5d %-10.2f%n", item.getName(), d.getQuantity(), sub);
+        }
+        System.out.println("------------------------------");
+        System.out.printf("totalPrice: %.2f%n", total);
     }
 
     public void showOrderHistory(int userId) {
 
-        // TODO:
+        List<Order> orders = orderDao.findByUserId(userId);
-        // Display user's order history
+
+        if (orders.isEmpty())
+        {
+            System.out.println("No orders found.");
+            return;
+        }
+
+        System.out.println("\n===== ORDER HISTORY =====");
+
+        for (Order order : orders)
+        {
+            System.out.println("Order ID: " + order.getId()
+                    + " | Total: $" + order.getTotalPrice()
+                    + " | Date: " + order.getCreatedAt()
+            );
+        }
 
     }
 
+
+    public List<CartItem> buildCart(Scanner scanner) {
+
+        List<CartItem> cart = new ArrayList<>();
+
+        menuService.showMenu();
+
+        while(true) {
+            System.out.println("\n[0] End order");
+            System.out.println("[-1] Show menu again");
+            System.out.println("Please select an item number:");
+
+            if (!scanner.hasNextInt()) {
+                System.err.println("Invalid input. Please enter a number.");
+                scanner.next();
+                continue;
+            }
+
+            int choice = scanner.nextInt();
+
+            if (choice == -1) {
+                menuService.showMenu();
+                continue;
+            }
+
+            if (choice == 0) {
+                if (cart.isEmpty()) {
+                    System.out.println("Your cart is empty. Please select items.");
+                    continue;
+                }
+                break;
+            }
+
+            MenuItem item = MenuService.menuItemDao.findById(choice);
+
+            if (item == null) {
+                System.err.println("Invalid item ID, please try again.");
+                continue;
+            }
+
+            System.out.println("Enter quantity for " + item.getName() + ": ");
+
+            if (!scanner.hasNextInt()) {
+                System.err.println("Invalid quantity input. Please enter a number.");
+                scanner.next();
+                continue;
+            }
+
+            int quantity = scanner.nextInt();
+
+            if (quantity <= 0){
+                System.err.println("Invalid quantity. Must be greater than 0.");
+                continue;
+            }
+
+            cart.add(new CartItem(item, quantity));
+            System.out.println(quantity + "x " + item.getName() + " added to cart.");
+        }
+
+        return cart;
+    }
+
 }