WS10

src/main/java/dev/Main.java

@@ -5,10 +5,8 @@ import dev.ui.ConsoleMenu;
 public class Main {
 
     public static void main(String[] args) {
-
         ConsoleMenu menu = new ConsoleMenu();
         menu.start();
-
     }
 
 }

src/main/java/dev/dao/MenuItemDao.java

@@ -1,25 +1,65 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
 import dev.model.MenuItem;
 
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
 import java.util.List;
 
 public class MenuItemDao {
 
     public List<MenuItem> findAll() {
-
-        // TODO:
-        // Retrieve all menu items
-
-        return null;
+        List<MenuItem> items = new ArrayList<>();
+        String sql = "SELECT * FROM menu_items";
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement stmt = conn.prepareStatement(sql);
+             ResultSet rs = stmt.executeQuery()) {
+            while (rs.next()) {
+                MenuItem item = new MenuItem();
+                item.setId(rs.getInt("id"));
+                item.setName(rs.getString("name"));
+                item.setDescription(rs.getString("description"));
+                item.setPrice(rs.getDouble("price"));
+                item.setCategory(rs.getString("category"));
+                items.add(item);
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return items;
     }
 
     public MenuItem findById(int id) {
-
-        // TODO:
-        // Find menu item by id
-
+        String sql = "SELECT * FROM menu_items WHERE id = ?";
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement stmt = conn.prepareStatement(sql)) {
+            stmt.setInt(1, id);
+            try (ResultSet rs = stmt.executeQuery()) {
+                if (rs.next()) {
+                    MenuItem item = new MenuItem();
+                    item.setId(rs.getInt("id"));
+                    item.setName(rs.getString("name"));
+                    item.setDescription(rs.getString("description"));
+                    item.setPrice(rs.getDouble("price"));
+                    item.setCategory(rs.getString("category"));
+                    return item;
+                }
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
         return null;
     }
 
+    public List<MenuItem> getAllItems() {
+        return findAll();
+    }
+
+    public MenuItem getById(int id) {
+        return findById(id);
+    }
 }

src/main/java/dev/dao/OrderDao.java

@@ -1,25 +1,100 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
 import dev.model.Order;
+import dev.model.OrderDetail;
 
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.sql.Timestamp;
+import java.util.ArrayList;
 import java.util.List;
 
 public class OrderDao {
 
     public int save(Order order) {
+        String sql = "INSERT INTO orders (user_id, created_at, total_price) VALUES (?, ?, ?)";
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement stmt = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS)) {
+            stmt.setInt(1, order.getUserId());
+            stmt.setTimestamp(2, Timestamp.valueOf(order.getCreatedAt()));
+            stmt.setDouble(3, order.getTotalPrice());
+            stmt.executeUpdate();
 
-        // TODO:
-        // Insert order and return generated id
-
+            try (ResultSet rs = stmt.getGeneratedKeys()) {
+                if (rs.next()) {
+                    return rs.getInt(1);
+                }
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
         return -1;
     }
 
     public List<Order> findByUserId(int userId) {
+        List<Order> orders = new ArrayList<>();
+        String sql = "SELECT * FROM orders WHERE user_id = ?";
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement stmt = conn.prepareStatement(sql)) {
+            stmt.setInt(1, userId);
+            try (ResultSet rs = stmt.executeQuery()) {
+                while (rs.next()) {
+                    Order order = new Order();
+                    order.setId(rs.getInt("id"));
+                    order.setUserId(rs.getInt("user_id"));
+                    order.setCreatedAt(rs.getTimestamp("created_at").toLocalDateTime());
+                    order.setTotalPrice(rs.getDouble("total_price"));
+                    orders.add(order);
+                }
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return orders;
+    }
 
-        // TODO:
-        // Retrieve all orders of a user
+    public int saveOrder(Order order, List<OrderDetail> details) {
+        int orderId = save(order);
+        if (orderId != -1) {
+            OrderDetailDao detailDao = new OrderDetailDao();
+            for (OrderDetail detail : details) {
+                detail.setOrderId(orderId);
+                detailDao.save(detail);
+            }
+        }
+        return orderId;
+    }
 
+    public Order getOrderById(int orderId) {
+        String sql = "SELECT * FROM orders WHERE id = ?";
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement stmt = conn.prepareStatement(sql)) {
+            stmt.setInt(1, orderId);
+            try (ResultSet rs = stmt.executeQuery()) {
+                if (rs.next()) {
+                    Order order = new Order();
+                    order.setId(rs.getInt("id"));
+                    order.setUserId(rs.getInt("user_id"));
+                    order.setCreatedAt(rs.getTimestamp("created_at").toLocalDateTime());
+                    order.setTotalPrice(rs.getDouble("total_price"));
+                    return order;
+                }
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
         return null;
     }
 
+    public List<OrderDetail> getOrderDetails(int orderId) {
+        return new OrderDetailDao().findByOrderId(orderId);
+    }
+
+    public List<Order> getOrdersByUserId(int userId) {
+        return findByUserId(userId);
+    }
 }

src/main/java/dev/dao/OrderDetailDao.java

@@ -1,24 +1,51 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
 import dev.model.OrderDetail;
 
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
 import java.util.List;
 
 public class OrderDetailDao {
 
     public void save(OrderDetail detail) {
-
-        // TODO:
-        // Insert order detail
-
+        String sql = "INSERT INTO order_details (order_id, menu_item_id, quantity, unit_price) VALUES (?, ?, ?, ?)";
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement stmt = conn.prepareStatement(sql)) {
+            stmt.setInt(1, detail.getOrderId());
+            stmt.setInt(2, detail.getMenuItemId());
+            stmt.setInt(3, detail.getQuantity());
+            stmt.setDouble(4, detail.getPrice());
+            stmt.executeUpdate();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
     }
 
     public List<OrderDetail> findByOrderId(int orderId) {
-
-        // TODO:
-        // Retrieve order details
-
-        return null;
+        List<OrderDetail> details = new ArrayList<>();
+        String sql = "SELECT * FROM order_details WHERE order_id = ?";
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement stmt = conn.prepareStatement(sql)) {
+            stmt.setInt(1, orderId);
+            try (ResultSet rs = stmt.executeQuery()) {
+                while (rs.next()) {
+                    OrderDetail detail = new OrderDetail();
+                    detail.setId(rs.getInt("id"));
+                    detail.setOrderId(rs.getInt("order_id"));
+                    detail.setMenuItemId(rs.getInt("menu_item_id"));
+                    detail.setQuantity(rs.getInt("quantity"));
+                    detail.setPrice(rs.getDouble("unit_price"));
+                    details.add(detail);
+                }
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return details;
     }
-
 }

src/main/java/dev/dao/UserDao.java

@@ -1,23 +1,48 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
 import dev.model.User;
 
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
 public class UserDao {
 
     public boolean save(User user) {
-
-        // TODO:
-        // Insert user into database
-
-        return false;
+        String sql = "INSERT INTO users (username, password_hash, email) VALUES (?, ?, ?)";
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement stmt = conn.prepareStatement(sql)) {
+            stmt.setString(1, user.getUsername());
+            stmt.setString(2, user.getPassword());
+            stmt.setString(3, user.getEmail());
+            int affectedRows = stmt.executeUpdate();
+            return affectedRows > 0;
+        } catch (SQLException e) {
+            e.printStackTrace();
+            return false;
+        }
     }
 
     public User findByUsername(String username) {
-
-        // TODO:
-        // Find a user by username
-
+        String sql = "SELECT * FROM users WHERE username = ?";
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement stmt = conn.prepareStatement(sql)) {
+            stmt.setString(1, username);
+            try (ResultSet rs = stmt.executeQuery()) {
+                if (rs.next()) {
+                    User user = new User();
+                    user.setId(rs.getInt("id"));
+                    user.setUsername(rs.getString("username"));
+                    user.setPassword(rs.getString("password_hash"));
+                    user.setEmail(rs.getString("email"));
+                    return user;
+                }
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
         return null;
     }
-
 }

src/main/java/dev/database/DatabaseConnection.java

@@ -1,27 +1,61 @@
-package dev.database;
+package dev.model;
 
-import java.sql.Connection;
-import java.sql.SQLException;
+public class OrderDetail {
 
-public class DatabaseConnection {
-
-    private static final String URL = "jdbc:postgresql://localhost:5432/restaurant_db"; // DB Server
-
-    private static final String USER = "postgres"; // Your Username
-
-    private static final String PASSWORD = "password"; // Your Password
-
-    private DatabaseConnection() {
+    private int id;
+    private int orderId;
+    private int menuItemId;
+    private int quantity;
+    private double price;
 
+    public OrderDetail() {
     }
 
-    public static Connection getConnection()
-            throws SQLException {
-
-        // TODO:
-        // Return a valid PostgreSQL connection
-
-        return null;
+    public OrderDetail(int id, int orderId, int menuItemId, int quantity, double price) {
+        this.id = id;
+        this.orderId = orderId;
+        this.menuItemId = menuItemId;
+        this.quantity = quantity;
+        this.price = price;
     }
 
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public int getOrderId() {
+        return orderId;
+    }
+
+    public void setOrderId(int orderId) {
+        this.orderId = orderId;
+    }
+
+    public int getMenuItemId() {
+        return menuItemId;
+    }
+
+    public void setMenuItemId(int menuItemId) {
+        this.menuItemId = menuItemId;
+    }
+
+    public int getQuantity() {
+        return quantity;
+    }
+
+    public void setQuantity(int quantity) {
+        this.quantity = quantity;
+    }
+
+    public double getPrice() {
+        return price;
+    }
+
+    public void setPrice(double price) {
+        this.price = price;
+    }
 }

src/main/java/dev/model/MenuItem.java

@@ -3,13 +3,59 @@ package dev.model;
 public class MenuItem {
 
     private int id;
-
     private String name;
-
     private String description;
-
     private double price;
-
     private String category;
 
+    public MenuItem() {
+    }
+
+    public MenuItem(int id, String name, String description, double price, String category) {
+        this.id = id;
+        this.name = name;
+        this.description = description;
+        this.price = price;
+        this.category = category;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int 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;
+    }
+
+    public String getCategory() {
+        return category;
+    }
+
+    public void setCategory(String category) {
+        this.category = category;
+    }
 }

src/main/java/dev/model/Order.java

@@ -5,11 +5,49 @@ import java.time.LocalDateTime;
 public class Order {
 
     private int id;
-
     private int userId;
-
     private LocalDateTime createdAt;
-
     private double totalPrice;
 
+    public Order() {
+    }
+
+    public Order(int id, int userId, LocalDateTime createdAt, double totalPrice) {
+        this.id = id;
+        this.userId = userId;
+        this.createdAt = createdAt;
+        this.totalPrice = totalPrice;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public int getUserId() {
+        return userId;
+    }
+
+    public void setUserId(int userId) {
+        this.userId = userId;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public double getTotalPrice() {
+        return totalPrice;
+    }
+
+    public void setTotalPrice(double totalPrice) {
+        this.totalPrice = totalPrice;
+    }
 }

src/main/java/dev/model/OrderDetail.java

@@ -3,13 +3,59 @@ package dev.model;
 public class OrderDetail {
 
     private int id;
-
     private int orderId;
-
     private int menuItemId;
-
     private int quantity;
-
     private double price;
 
+    public OrderDetail() {
+    }
+
+    public OrderDetail(int id, int orderId, int menuItemId, int quantity, double price) {
+        this.id = id;
+        this.orderId = orderId;
+        this.menuItemId = menuItemId;
+        this.quantity = quantity;
+        this.price = price;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public int getOrderId() {
+        return orderId;
+    }
+
+    public void setOrderId(int orderId) {
+        this.orderId = orderId;
+    }
+
+    public int getMenuItemId() {
+        return menuItemId;
+    }
+
+    public void setMenuItemId(int menuItemId) {
+        this.menuItemId = menuItemId;
+    }
+
+    public int getQuantity() {
+        return quantity;
+    }
+
+    public void setQuantity(int quantity) {
+        this.quantity = quantity;
+    }
+
+    public double getPrice() {
+        return price;
+    }
+
+    public void setPrice(double price) {
+        this.price = price;
+    }
 }

src/main/java/dev/model/User.java

@@ -3,11 +3,49 @@ package dev.model;
 public class User {
 
     private int id;
-
     private String username;
-
     private String password;
-
     private String email;
 
+    public User() {
+    }
+
+    public User(int id, String username, String password, String email) {
+        this.id = id;
+        this.username = username;
+        this.password = password;
+        this.email = email;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
 }

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

@@ -1,23 +1,46 @@
 package dev.service;
 
+import dev.dao.UserDao;
 import dev.model.User;
 
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.Base64;
+
 public class AuthService {
 
+    private final UserDao userDao = new UserDao();
+
     public boolean register(String username, String password, String email) {
+        if (userDao.findByUsername(username) != null) {
+            return false;
+        }
 
-        // TODO:
-        // Validate and register user
+        User user = new User();
+        user.setUsername(username);
+        user.setPassword(hashPassword(password));
+        user.setEmail(email);
 
-        return false;
+        return userDao.save(user);
     }
 
     public User login(String username, String password) {
+        User user = userDao.findByUsername(username);
 
-        // TODO:
-        // Authenticate user
+        if (user != null && user.getPassword().equals(hashPassword(password))) {
+            return user;
+        }
 
         return null;
     }
 
+    private String hashPassword(String password) {
+        try {
+            MessageDigest md = MessageDigest.getInstance("SHA-256");
+            byte[] hash = md.digest(password.getBytes());
+            return Base64.getEncoder().encodeToString(hash);
+        } catch (NoSuchAlgorithmException e) {
+            throw new RuntimeException("Error hashing password", e);
+        }
+    }
 }

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

@@ -1,12 +1,21 @@
 package dev.service;
 
+import dev.dao.MenuItemDao;
+import dev.model.MenuItem;
+
+import java.util.List;
+
 public class MenuService {
 
+    private final MenuItemDao menuItemDao = new MenuItemDao();
+
     public void showMenu() {
+        List<MenuItem> items = menuItemDao.getAllItems();
 
-        // TODO:
-        // Display menu items
-
+        System.out.println("\nAvailable Items:");
+        for (MenuItem item : items) {
+            System.out.printf("%d. %s - $%.2f%n", item.getId(), item.getName(), item.getPrice());
+        }
+        System.out.println();
     }
-
 }

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

@@ -1,26 +1,80 @@
 package dev.service;
 
+import dev.dao.MenuItemDao;
+import dev.dao.OrderDao;
+import dev.model.MenuItem;
+import dev.model.Order;
+import dev.model.OrderDetail;
+
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
 public class OrderService {
 
-    public void placeOrder(int userId) {
+    private final OrderDao orderDao = new OrderDao();
+    private final MenuItemDao menuItemDao = new MenuItemDao();
 
-        // TODO:
-        // Create order
+    public void placeOrder(int userId, Map<Integer, Integer> cart) {
+        Order order = new Order();
+        order.setUserId(userId);
+        order.setCreatedAt(LocalDateTime.now());
 
+        double total = 0;
+        List<OrderDetail> details = new ArrayList<>();
+
+        for (Map.Entry<Integer, Integer> entry : cart.entrySet()) {
+            MenuItem item = menuItemDao.getById(entry.getKey());
+            if (item != null) {
+                OrderDetail detail = new OrderDetail();
+                detail.setMenuItemId(item.getId());
+                detail.setQuantity(entry.getValue());
+                detail.setPrice(item.getPrice());
+
+                details.add(detail);
+                total += item.getPrice() * entry.getValue();
+            }
+        }
+
+        order.setTotalPrice(total);
+        int orderId = orderDao.saveOrder(order, details);
+
+        System.out.println("\nOrder saved successfully!");
+        printReceipt(orderId);
     }
 
     public void printReceipt(int orderId) {
+        Order order = orderDao.getOrderById(orderId);
+        List<OrderDetail> details = orderDao.getOrderDetails(orderId);
 
-        // TODO:
-        // Print order receipt
+        System.out.println("\n[Order Summary / Receipt]");
+        System.out.println("---------------------------------------");
+        System.out.printf("%-15s %-5s %-10s %-10s%n", "Item", "Qty", "Unit", "Total");
+        System.out.println("---------------------------------------");
 
+        for (OrderDetail detail : details) {
+            MenuItem item = menuItemDao.getById(detail.getMenuItemId());
+            double subtotal = detail.getQuantity() * detail.getPrice();
+            System.out.printf("%-15s %-5d $%-9.2f $%.2f%n", item.getName(), detail.getQuantity(), detail.getPrice(), subtotal);
+        }
+
+        System.out.println("---------------------------------------");
+        System.out.printf("Final Total: $%.2f%n", order.getTotalPrice());
     }
 
     public void showOrderHistory(int userId) {
+        List<Order> orders = orderDao.getOrdersByUserId(userId);
 
-        // TODO:
-        // Display user's order history
+        System.out.println("\n[Order History]");
+        if (orders.isEmpty()) {
+            System.out.println("You have no past orders.");
+            return;
+        }
 
+        for (Order order : orders) {
+            System.out.printf("Order ID: %d | Date: %s | Total Spent: $%.2f%n",
+                    order.getId(), order.getCreatedAt(), order.getTotalPrice());
+        }
     }
-
 }

src/main/java/dev/ui/ConsoleMenu.java

@@ -1,44 +1,147 @@
 package dev.ui;
 
+import dev.model.User;
+import dev.service.AuthService;
+import dev.service.MenuService;
+import dev.service.OrderService;
+
+import java.util.HashMap;
+import java.util.Map;
 import java.util.Scanner;
 
 public class ConsoleMenu {
 
-    private final Scanner scanner =
-            new Scanner(System.in);
+    private final Scanner scanner = new Scanner(System.in);
+    private final AuthService authService = new AuthService();
+    private final MenuService menuService = new MenuService();
+    private final OrderService orderService = new OrderService();
+
+    private User loggedInUser = null;
 
     public void start() {
-
         while (true) {
-
-            System.out.println();
-            System.out.println("===== JAVA PIZZERIA =====");
-            System.out.println("1. Login");
-            System.out.println("2. Register");
-            System.out.println("3. Exit");
-
-            int choice = scanner.nextInt();
-
-            switch (choice) {
-
-                case 1:
-                    // TODO
-                    break;
-
-                case 2:
-                    // TODO
-                    break;
-
-                case 3:
-                    return;
-
-                default:
-                    System.out.println("Invalid choice");
-
+            if (loggedInUser == null) {
+                showAuthMenu();
+            } else {
+                showMainMenu();
             }
-
         }
-
     }
 
+    private void showAuthMenu() {
+        System.out.println("\n===== JAVA PIZZERIA =====");
+        System.out.println("1. Login");
+        System.out.println("2. Register");
+        System.out.println("3. Exit");
+        System.out.print("Choose an option: ");
+
+        int choice = scanner.nextInt();
+        scanner.nextLine();
+
+        switch (choice) {
+            case 1:
+                login();
+                break;
+            case 2:
+                register();
+                break;
+            case 3:
+                System.exit(0);
+            default:
+                System.out.println("Invalid choice");
+        }
+    }
+
+    private void showMainMenu() {
+        System.out.println("\n===== MAIN MENU =====");
+        System.out.println("1. View Menu");
+        System.out.println("2. Place a New Order");
+        System.out.println("3. View Order History");
+        System.out.println("4. Logout");
+        System.out.print("Choose an option: ");
+
+        int choice = scanner.nextInt();
+        scanner.nextLine();
+
+        switch (choice) {
+            case 1:
+                menuService.showMenu();
+                break;
+            case 2:
+                placeOrderFlow();
+                break;
+            case 3:
+                orderService.showOrderHistory(loggedInUser.getId());
+                break;
+            case 4:
+                loggedInUser = null;
+                break;
+            default:
+                System.out.println("Invalid choice");
+        }
+    }
+
+    private void login() {
+        System.out.println("\n[Login]");
+        System.out.print("Enter username: ");
+        String username = scanner.nextLine();
+        System.out.print("Enter password: ");
+        String password = scanner.nextLine();
+
+        loggedInUser = authService.login(username, password);
+
+        if (loggedInUser == null) {
+            System.out.println("Invalid credentials. Please try again.");
+        } else {
+            System.out.println("Login successful!");
+        }
+    }
+
+    private void register() {
+        System.out.println("\n[Register]");
+        System.out.print("Enter username: ");
+        String username = scanner.nextLine();
+        System.out.print("Enter password: ");
+        String password = scanner.nextLine();
+        System.out.print("Enter email: ");
+        String email = scanner.nextLine();
+
+        boolean success = authService.register(username, password, email);
+        if (success) {
+            System.out.println("Registration successful. You can now login.");
+        } else {
+            System.out.println("Registration failed. Username might be taken.");
+        }
+    }
+
+    private void placeOrderFlow() {
+        System.out.println("\n[Placing Order]");
+        menuService.showMenu();
+
+        Map<Integer, Integer> cart = new HashMap<>();
+
+        while (true) {
+            System.out.print("Enter the ID of the item to add (or 0 to finish): ");
+            int itemId = scanner.nextInt();
+            if (itemId == 0) {
+                break;
+            }
+
+            System.out.print("Enter quantity: ");
+            int quantity = scanner.nextInt();
+
+            if (quantity > 0) {
+                cart.put(itemId, cart.getOrDefault(itemId, 0) + quantity);
+                System.out.println("Item added to your cart.");
+            } else {
+                System.out.println("Quantity must be greater than zero.");
+            }
+        }
+
+        if (!cart.isEmpty()) {
+            orderService.placeOrder(loggedInUser.getId(), cart);
+        } else {
+            System.out.println("Order cancelled. Cart is empty.");
+        }
+    }
 }