Merge pull request 'Develop' (#1) from develop into main

Reviewed-on: mohammadreza/WS-10-Database#1

database.sql

@@ -1,141 +1,82 @@
--- Restaurant Database Management System
---
--- Instructions:
--- 1. Create all required tables.
--- 2. Design appropriate PRIMARY KEY and FOREIGN KEY relationships.
--- 3. Add suitable constraints based on the requirements.
--- 4. Insert initial mock data.
--- 5. Insert at least 3 menu items.
--- 6. The script should be executable from start to finish without errors.
-
-
-
 -- =======================================================
 -- USER TABLE
 -- =======================================================
---
--- Represents customers using the system.
---
--- Required information:
--- - Unique identifier
--- - Username
--- - Password
--- - Email (optional)
---
--- Requirements:
--- - Each user must have a unique identifier.
--- - Usernames must be unique.
--- - Username and password are required.
--- - Passwords should not be stored in plain text.
---
--- CREATE TABLE ...
 
+CREATE TABLE users(
+    id SERIAL PRIMARY KEY,
+    username VARCHAR(50) UNIQUE NOT NULL,
+    password_hash TEXT NOT NULL,
+    email VARCHAR(250)
+);
 
 
 -- =======================================================
 -- MENU ITEM TABLE
 -- =======================================================
---
--- Represents available food and drink items.
---
--- Required information:
--- - Unique identifier
--- - Name
--- - Description (optional)
--- - Price
--- - Category (optional)
---
--- Requirements:
--- - Each menu item must have a unique identifier.
--- - Name is required.
--- - Price must always be positive.
---
--- CREATE TABLE ...
 
 
+CREATE TABLE menu_items(
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(250) NOT NULL,
+    description TEXT,
+    price NUMERIC NOT NULL CHECK (price > 0),
+    category VARCHAR(50)
+);
 
 -- =======================================================
 -- ORDER TABLE
 -- =======================================================
---
--- Represents orders placed by customers.
---
--- Required information:
--- - Unique identifier
--- - Reference to customer
--- - Creation date and time
--- - Total price
---
--- Requirements:
--- - Each order must belong to exactly one user.
--- - A user can have multiple orders.
--- - The relationship between User and Order must be implemented.
---
--- Note:
--- Avoid using reserved SQL keywords as table names.
--- Consider using a name such as "orders" or "customer_orders".
---
--- CREATE TABLE ...
 
+CREATE TABLE user_orders (
+    id SERIAL PRIMARY KEY,
+    user_id INT NOT NULL,
+    created_at TIMESTAMP NOT NULL,
+    total_price NUMERIC NOT NULL,
+
+    FOREIGN KEY (user_id) REFERENCES users(id)
+);
 
 
 -- =======================================================
 -- ORDER DETAIL TABLE
 -- =======================================================
---
--- Represents items inside an order.
---
--- Required information:
--- - Unique identifier
--- - Reference to an order
--- - Reference to a menu item
--- - Quantity
--- - Item price at purchase time
---
--- Requirements:
--- - Each detail record must belong to one order.
--- - Each detail record must reference one menu item.
--- - Quantity must always be greater than zero.
--- - Store the item's price at the moment of purchase.
---
--- CREATE TABLE ...
 
 
+CREATE TABLE order_details(
+    id SERIAL PRIMARY KEY,
+    order_id INT NOT NULL,
+    menu_id INT NOT NULL,
+    quantity NUMERIC NOT NULL CHECK (quantity > 0),
+    item_price NUMERIC NOT NULL CHECK (item_price > 0),
+
+    FOREIGN KEY (order_id) REFERENCES user_orders(id),
+    FOREIGN KEY (menu_id) REFERENCES menu_items(id)
+);
 
 -- =======================================================
 -- INITIAL MENU DATA
 -- =======================================================
---
--- Insert at least 3 food or drink items.
---
--- Example categories:
--- - Pizza
--- - Burger
--- - Pasta
--- - Drink
---
--- INSERT INTO ...
 
 
-
+INSERT INTO menu_items (name, description, price, category) VALUES
--- =======================================================
+('Margherita Pizza', 'Classic pizza with tomato sauce, mozzarella, and basil.', 12.99, 'Pizza'),
--- OPTIONAL TEST DATA
+('Pepperoni Pizza', NULL, 14.49, 'Pizza'),
--- =======================================================
+('Cheeseburger', 'Beef patty with cheddar cheese, lettuce, and tomato.', 10.99, 'Burger'),
---
+('Chicken Burger', NULL, 11.49, 'Burger'),
--- You may insert sample users and orders for testing.
+('Caesar Salad', 'Romaine lettuce, croutons, parmesan, and Caesar dressing.', 8.99, 'Salad'),
--- This section is optional.
+('Greek Salad', NULL, 9.49, 'Salad'),
---
+('French Fries', 'Crispy golden potato fries.', 4.99, 'Side'),
--- INSERT INTO ...
+('Onion Rings', NULL, 5.49, 'Side'),
+('Espresso', NULL, 2.99, 'Drink'),
+('Cappuccino', 'Espresso with steamed milk and milk foam.', 4.49, 'Drink');
 
 
 
 -- =======================================================
 -- VERIFICATION QUERIES
 -- =======================================================
---
+
--- Uncomment these queries to verify your database.
+SELECT * FROM users;
---
+SELECT * FROM menu_items;
--- SELECT * FROM ...;
+SELECT * FROM user_orders;
--- SELECT * FROM ...;
+SELECT * FROM order_details;
--- SELECT * FROM ...;
--- SELECT * FROM ...;

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

@@ -1,24 +1,73 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
 import dev.model.MenuItem;
 
+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:
+        String sql = "SELECT * FROM menu_items";
-        // Retrieve all menu items
+        List<MenuItem> items = new ArrayList<>();
 
-        return null;
+        try (PreparedStatement ps = DatabaseConnection
+                                    .getConnection()
+                                    .prepareStatement(sql))
+        {
+            ResultSet rs = ps.executeQuery();
+            while (rs.next())
+            {
+                MenuItem menuItem = new MenuItem();
+                menuItem.setId(rs.getInt("id"));
+                menuItem.setName(rs.getString("name"));
+                menuItem.setDescription(rs.getString("description"));
+                menuItem.setPrice(rs.getDouble("price"));
+                menuItem.setCategory(rs.getString("category"));
+
+                items.add(menuItem);
+            }
+
+        } catch (SQLException e) {
+
+            System.out.println(e.getStackTrace());
+        }
+
+        return items;
     }
 
     public MenuItem findById(int id) {
 
-        // TODO:
+        String sql = "SELECT * FROM menu_items WHERE id=?";
-        // Find menu item by id
 
+        try(PreparedStatement ps = DatabaseConnection
+                .getConnection()
+                .prepareStatement(sql))
+        {
+            ps.setInt(1,id);
+            ResultSet rs = ps.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;
     }
 

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

@@ -1,25 +1,75 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
 import dev.model.Order;
 
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Timestamp;
+import java.util.ArrayList;
 import java.util.List;
 
 public class OrderDao {
 
     public int save(Order order) {
 
-        // TODO:
+        String sql = "INSERT INTO user_orders(user_id, created_at, total_price) VALUES(?,?,?)";
-        // Insert order and return generated id
+
+
+        try (PreparedStatement ps = DatabaseConnection
+                                    .getConnection()
+                                    .prepareStatement(sql, PreparedStatement.RETURN_GENERATED_KEYS))
+        {
+
+            ps.setInt(1, order.getUserId());
+            ps.setTimestamp(2, Timestamp.valueOf(order.getCreatedAt()));
+            ps.setDouble(3, order.getTotalPrice());
+
+            ps.executeUpdate();
+            ResultSet rs = ps.getGeneratedKeys();
+
+            if(rs.next()) return rs.getInt(1);
+
+        } catch (SQLException e) {
+
+            e.printStackTrace();
+        }
 
         return -1;
     }
 
     public List<Order> findByUserId(int userId) {
 
-        // TODO:
+        List<Order> orders = new ArrayList<>();
-        // Retrieve all orders of a user
+        String sql = "SELECT * FROM user_orders WHERE user_id=?";
 
-        return null;
+        try(PreparedStatement ps = DatabaseConnection
+                                    .getConnection()
+                                    .prepareStatement(sql))
+
+        {
+            ps.setInt(1,userId);
+            ResultSet rs = ps.executeQuery();
+
+            while(rs.next())
+            {
+
+                Order order = new Order();
+
+                order.setId(rs.getInt("id"));
+                order.setUserId(rs.getInt("user_id"));
+                order.setTotalPrice(rs.getDouble("total_price"));
+                order.setCreatedAt(rs.getTimestamp("created_at").toLocalDateTime());
+
+                orders.add(order);
+            }
+        }
+        catch (SQLException e)
+        {
+            e.printStackTrace();
+        }
+        return orders;
     }
 
 }

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

@@ -1,24 +1,70 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
+
 import dev.model.OrderDetail;
 
+
+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:
+        String sql = "INSERT INTO order_details (order_id, menu_id, quantity, item_price) VALUES (?,?,?,?)";
-        // Insert order detail
+
+        try (PreparedStatement ps = DatabaseConnection
+                                    .getConnection()
+                                    .prepareStatement(sql))
+        {
+            ps.setInt(1,detail.getOrderId());
+            ps.setInt(2,detail.getMenuItemId());
+            ps.setInt(3,detail.getQuantity());
+            ps.setDouble(4,detail.getPrice());
+
+            ps.executeUpdate();
+
+        } catch (SQLException e) {
+
+            System.out.println(e.getStackTrace());
+        }
 
     }
 
     public List<OrderDetail> findByOrderId(int orderId) {
 
-        // TODO:
+       String sql = "SELECT * FROM order_details WHERE order_id=?";
-        // Retrieve order details
 
-        return null;
+        List<OrderDetail> details = new ArrayList<>();
+
+       try (PreparedStatement ps = DatabaseConnection
+                                    .getConnection()
+                                    .prepareStatement(sql))
+       {
+           ps.setInt(1,orderId);
+           ResultSet rs = ps.executeQuery();
+
+           while(rs.next())
+           {
+               OrderDetail detail = new OrderDetail();
+
+               detail.setOrderId(rs.getInt("order_id"));
+               detail.setMenuItemId(rs.getInt("menu_id"));
+               detail.setPrice(rs.getDouble("item_price"));
+               detail.setQuantity(rs.getInt("quantity"));
+
+               details.add(detail);
+           }
+
+       } catch (SQLException e) {
+           System.out.println(e.getStackTrace());
+       }
+
+        return details;
     }
 
 }

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

@@ -1,23 +1,58 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
 import dev.model.User;
 
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
 public class UserDao {
 
     public boolean save(User user) {
 
-        // TODO:
+        String sql = "INSERT INTO users (username, password_hash, email) VALUES (?, ?, ?)";
-        // Insert user into database
+
+        try {
+            PreparedStatement ps = DatabaseConnection.getConnection().prepareStatement(sql);
+            ps.setString(1, user.getUsername());
+            ps.setString(2, user.getPasswordHash());
+            ps.setString(3, user.getEmail());
+            ps.executeUpdate();
+            return true;
+        } catch (SQLException e) {
+
+            System.out.println("fail to save user: " + e.getMessage());
+        }
 
         return false;
     }
 
     public User findByUsername(String username) {
 
-        // TODO:
+        String sql = "SELECT * FROM users WHERE username=?";
-        // Find a user by username
 
-        return null;
+        User result = null;
+
+
+        try {
+            PreparedStatement stmt = DatabaseConnection.getConnection().prepareStatement(sql);
+            stmt.setString(1, username);
+
+            ResultSet rs = stmt.executeQuery();
+
+            if (rs.next()){
+                result = new User(
+                        rs.getInt("id"),
+                        rs.getString("username"),
+                        rs.getString("password_hash"),
+                        rs.getString("email")
+                );
+            }
+        } catch (SQLException e) {
+            System.err.println("Unable to find user: " + e.getMessage());
+        }
+        return result;
     }
 
 }

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

@@ -1,6 +1,7 @@
 package dev.database;
 
 import java.sql.Connection;
+import java.sql.DriverManager;
 import java.sql.SQLException;
 
 public class DatabaseConnection {
@@ -9,7 +10,7 @@ public class DatabaseConnection {
 
     private static final String USER = "postgres"; // Your Username
 
-    private static final String PASSWORD = "password"; // Your Password
+    private static final String PASSWORD = "FinalProjectDev"; // Your Password
 
     private DatabaseConnection() {
 
@@ -17,11 +18,7 @@ public class DatabaseConnection {
 
     public static Connection getConnection()
             throws SQLException {
-
+        return DriverManager.getConnection(URL,USER,PASSWORD);
-        // TODO:
-        // Return a valid PostgreSQL connection
-
-        return null;
     }
 
 }

src/main/java/dev/model/CartItem.java

@@ -0,0 +1,23 @@
+package dev.model;
+
+public class CartItem {
+    private final MenuItem item;
+    private final int quantity;
+
+    public CartItem(MenuItem item, int quantity) {
+        this.item = item;
+        this.quantity = quantity;
+    }
+
+    public MenuItem getItem() {
+        return item;
+    }
+
+    public int getQuantity() {
+        return quantity;
+    }
+
+    public double getSubtotal() {
+        return item.getPrice() * quantity;
+    }
+}

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

@@ -12,4 +12,44 @@ public class MenuItem {
 
     private String 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

@@ -12,4 +12,31 @@ public class Order {
 
     private double totalPrice;
 
+
+    public LocalDateTime getCreatedAt() { return createdAt; }
+
+    public void setCreatedAt(LocalDateTime createdAt) { this.createdAt = createdAt; }
+
+    public int getUserId() {
+        return userId;
+    }
+
+    public void setUserId(int userId) {
+        this.userId = userId;
+    }
+
+    public double getTotalPrice() {
+        return totalPrice;
+    }
+
+    public void setTotalPrice(double totalPrice) {
+        this.totalPrice = totalPrice;
+    }
+
+    public int getId() { return id; }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
 }

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

@@ -12,4 +12,20 @@ public class OrderDetail {
 
     private double price;
 
+    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

@@ -10,4 +10,37 @@ public class User {
 
     private String email;
 
+    public User(int id, String username, String passwordHash, String email) {
+        this.id = id;
+        this.username = username;
+        this.password = passwordHash;
+        this.email = email;
+    }
+
+    public User(String username, String passwordHash, String email) {
+        this.username = username;
+        this.password = passwordHash;
+        this.email = email;
+    }
+
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public String getPasswordHash() {
+        return password;
+    }
+
+    public String getEmail() {
+        return email;
+    }
 }

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;
     }
 
 }

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

@@ -1,5 +1,9 @@
 package dev.ui;
 
+import dev.model.User;
+import dev.service.AuthService;
+import dev.service.MenuService;
+
 import java.util.Scanner;
 
 public class ConsoleMenu {
@@ -7,6 +11,8 @@ public class ConsoleMenu {
     private final Scanner scanner =
             new Scanner(System.in);
 
+    private AuthService authService = new AuthService();
+
     public void start() {
 
         while (true) {
@@ -18,23 +24,50 @@ public class ConsoleMenu {
             System.out.println("3. Exit");
 
             int choice = scanner.nextInt();
+            scanner.nextLine();
 
             switch (choice) {
 
-                case 1:
+                case 1: {
-                    // TODO
+                    System.out.print("Enter your username: ");
-                    break;
+                    String username = scanner.nextLine();
+                    System.out.print("Enter your password: ");
+                    String password = scanner.nextLine();
 
-                case 2:
+                    User user = authService.login(username, password);
-                    // TODO
-                    break;
 
-                case 3:
+                    if (user == null) {
+                        System.err.println("Unable to login.");
+                        continue;
+                    }
+
+                    MenuService menuService = new MenuService();
+                    menuService.ShowPanel(user);
+                    break;
+                }
+                case 2: {
+                    System.out.print("Enter your username: ");
+                    String username = scanner.nextLine();
+                    System.out.print("Enter your password: ");
+                    String password = scanner.nextLine();
+                    System.out.print("Enter your email (optional): ");
+                    String tmp = scanner.nextLine();
+                    String email = tmp.isEmpty() ? null : tmp;
+
+                    if (!authService.register(username, password, email)) {
+                        System.err.println("Registration failed.");
+                        continue;
+                    }
+
+                    System.out.println("Registration successful!");
+                    break;
+                }
+                case 3: {
                     return;
-
+                }
-                default:
+                default: {
-                    System.out.println("Invalid choice");
+                    System.out.println("Invalid choice enter a number between [1, 3]");
-
+                }
             }
 
         }