feat : implement restaurant management system

database.sql

@@ -1,141 +1,62 @@
--- 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.
 
+CREATE DATABASE restaurant_db;
 
+DROP TABLE IF EXISTS order_details;
+DROP TABLE IF EXISTS orders;
+DROP TABLE IF EXISTS menu_items;
+DROP TABLE IF EXISTS users;
 
--- =======================================================
+CREATE TABLE users
--- USER TABLE
+(
--- =======================================================
+    id SERIAL PRIMARY KEY,
---
+    username VARCHAR(50) NOT NULL UNIQUE,
--- Represents customers using the system.
+    password VARCHAR(64) NOT NULL,
---
+    email VARCHAR(100)
--- 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 menu_items
+(
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(100) NOT NULL,
+    description TEXT,
+    price NUMERIC(10,2) NOT NULL CHECK(price > 0),
+    category VARCHAR(50)
+);
 
+CREATE TABLE orders
+(
+    id SERIAL PRIMARY KEY,
+    user_id INTEGER NOT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    total_price NUMERIC(10,2) NOT NULL CHECK(total_price >= 0),
 
--- =======================================================
+    CONSTRAINT fk_orders_user
--- MENU ITEM TABLE
+        FOREIGN KEY(user_id)
--- =======================================================
+            REFERENCES users(id)
---
+            ON DELETE CASCADE
--- 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 order_details
+(
+    id SERIAL PRIMARY KEY,
+    order_id INTEGER NOT NULL,
+    menu_item_id INTEGER NOT NULL,
+    quantity INTEGER NOT NULL CHECK(quantity > 0),
+    price NUMERIC(10,2) NOT NULL CHECK(price > 0),
 
+    CONSTRAINT fk_detail_order
+        FOREIGN KEY(order_id)
+            REFERENCES orders(id)
+            ON DELETE CASCADE,
 
--- =======================================================
+    CONSTRAINT fk_detail_menu
--- ORDER TABLE
+        FOREIGN KEY(menu_item_id)
--- =======================================================
+            REFERENCES menu_items(id)
---
+);
--- 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 ...
 
-
+INSERT INTO menu_items(name,description,price,category)
-
+VALUES
--- =======================================================
+    ('Pizza Margherita','Classic pizza',10.00,'Pizza'),
--- ORDER DETAIL TABLE
+    ('Cheese Burger','Beef burger',8.00,'Burger'),
--- =======================================================
+    ('Chicken Pasta','Creamy pasta',12.00,'Pasta'),
---
+    ('Cola','Cold drink',2.50,'Drink');
--- 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 ...
-
-
-
--- =======================================================
--- INITIAL MENU DATA
--- =======================================================
---
--- Insert at least 3 food or drink items.
---
--- Example categories:
--- - Pizza
--- - Burger
--- - Pasta
--- - Drink
---
--- INSERT INTO ...
-
-
-
--- =======================================================
--- OPTIONAL TEST DATA
--- =======================================================
---
--- You may insert sample users and orders for testing.
--- This section is optional.
---
--- INSERT INTO ...
-
-
-
--- =======================================================
--- VERIFICATION QUERIES
--- =======================================================
---
--- Uncomment these queries to verify your database.
---
--- SELECT * FROM ...;
--- SELECT * FROM ...;
--- SELECT * FROM ...;
--- SELECT * FROM ...;

src/main/java/dev/Main.java

@@ -8,7 +8,5 @@ public class Main {
 
         ConsoleMenu menu = new ConsoleMenu();
         menu.start();
-
     }
-
 }

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

@@ -1,25 +1,76 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
 import dev.model.MenuItem;
 
+import java.sql.*;
+import java.util.ArrayList;
 import java.util.List;
 
-public class MenuItemDao {
+public class MenuItemDao
+{
+    public List<MenuItem> findAll()
+    {
+        List<MenuItem> items = new ArrayList<>();
 
-    public List<MenuItem> findAll() {
+        String sql = "SELECT * FROM menu_items";
 
-        // TODO:
+        try(Connection connection = DatabaseConnection.getConnection();
-        // Retrieve all menu items
+            PreparedStatement ps = connection.prepareStatement(sql))
+        {
+            ResultSet rs = ps.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)
+    {
+        String sql = "SELECT * FROM menu_items WHERE id=?";
+
+        try(Connection connection = DatabaseConnection.getConnection();
+            PreparedStatement ps = connection.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;
     }
-
-    public MenuItem findById(int id) {
-
-        // TODO:
-        // Find menu item by id
-
-        return null;
-    }
-
 }

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

@@ -1,25 +1,85 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
 import dev.model.Order;
 
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.Statement;
+import java.sql.Timestamp;
+import java.sql.SQLException;
+import java.util.ArrayList;
 import java.util.List;
 
-public class OrderDao {
+public class OrderDao
+{
+    public int save(Order order)
+    {
+        String sql =
+                """
+                INSERT INTO orders
+                (user_id, created_at, total_price)
+                VALUES (?, ?, ?)
+                """;
 
-    public int save(Order order) {
+        try (Connection connection = DatabaseConnection.getConnection();
+             PreparedStatement ps = connection.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS))
+        {
+            ps.setInt(1, order.getUserId());
+            ps.setTimestamp(2, Timestamp.valueOf(order.getCreatedAt()));
+            ps.setDouble(3, order.getTotalPrice());
+            ps.executeUpdate();
 
-        // TODO:
+            ResultSet rs = ps.getGeneratedKeys();
-        // Insert order and return generated id
+
+            if (rs.next())
+                return rs.getInt(1);
+
+        }
+        catch (SQLException e)
+        {
+            e.printStackTrace();
+        }
 
         return -1;
     }
 
-    public List<Order> findByUserId(int userId) {
+    public List<Order> findByUserId(int userId)
+    {
+        List<Order> orders = new ArrayList<>();
 
-        // TODO:
+        String sql =
-        // Retrieve all orders of a user
+                """
+                SELECT *
+                FROM orders
+                WHERE user_id = ?
+                ORDER BY created_at DESC
+                """;
 
-        return null;
+        try (Connection connection = DatabaseConnection.getConnection();
+             PreparedStatement ps = connection.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.setCreatedAt(rs.getTimestamp("created_at").toLocalDateTime());
+                order.setTotalPrice(rs.getDouble("total_price"));
+
+                orders.add(order);
+            }
+
+        }
+        catch (SQLException e)
+        {
+            e.printStackTrace();
+        }
+
+        return orders;
     }
-
 }

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

@@ -1,24 +1,77 @@
 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 class OrderDetailDao
+{
+    public void save(OrderDetail detail)
+    {
+        String sql =
+                """
+                INSERT INTO order_details
+                (order_id, menu_item_id, quantity, price)
+                VALUES (?, ?, ?, ?)
+                """;
 
-    public void save(OrderDetail detail) {
+        try (Connection connection = DatabaseConnection.getConnection();
-
+             PreparedStatement ps = connection.prepareStatement(sql))
-        // TODO:
+        {
-        // Insert order detail
+            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)
+        {
+            e.printStackTrace();
+        }
     }
 
-    public List<OrderDetail> findByOrderId(int orderId) {
+    public List<OrderDetail> findByOrderId(int orderId)
+    {
+        List<OrderDetail> details = new ArrayList<>();
 
-        // TODO:
+        String sql =
-        // Retrieve order details
+                """
+                SELECT *
+                FROM order_details
+                WHERE order_id = ?
+                """;
 
-        return null;
+        try (Connection connection = DatabaseConnection.getConnection();
+             PreparedStatement ps = connection.prepareStatement(sql))
+        {
+            ps.setInt(1, orderId);
+            ResultSet rs = ps.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("price"));
+
+                details.add(detail);
+            }
+
+        }
+        catch (SQLException e)
+        {
+            e.printStackTrace();
+        }
+
+        return details;
     }
-
 }

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

@@ -1,23 +1,60 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
 import dev.model.User;
+import java.sql.*;
 
-public class UserDao {
+public class UserDao
+{
+    public boolean save(User user)
+    {
+        String sql = "INSERT INTO users(username,password,email) VALUES(?,?,?)";
 
-    public boolean save(User user) {
+        try(Connection connection = DatabaseConnection.getConnection();
+            PreparedStatement ps = connection.prepareStatement(sql))
+        {
+            ps.setString(1,user.getUsername());
+            ps.setString(2,user.getPassword());
+            ps.setString(3,user.getEmail());
 
-        // TODO:
+            return ps.executeUpdate() > 0;
-        // Insert user into database
+        }
-
+        catch (SQLException e)
-        return false;
+        {
+            e.printStackTrace();
+            return false;
+        }
     }
 
-    public User findByUsername(String username) {
+    public User findByUsername(String username)
+    {
+        String sql = "SELECT * FROM users WHERE username=?";
 
-        // TODO:
+        try(Connection connection = DatabaseConnection.getConnection();
-        // Find a user by username
+            PreparedStatement ps = connection.prepareStatement(sql))
+        {
+            ps.setString(1,username);
+
+            ResultSet rs = ps.executeQuery();
+
+            if(rs.next())
+            {
+                User user = new User();
+
+                user.setId(rs.getInt("id"));
+                user.setUsername(rs.getString("username"));
+                user.setPassword(rs.getString("password"));
+                user.setEmail(rs.getString("email"));
+
+                return user;
+            }
+
+        }
+        catch (SQLException e)
+        {
+            e.printStackTrace();
+        }
 
         return null;
     }
-
 }

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 {
@@ -9,19 +10,13 @@ public class DatabaseConnection {
 
     private static final String USER = "postgres"; // Your Username
 
-    private static final String PASSWORD = "password"; // Your Password
+    private static final String PASSWORD = "99242096"; // Your Password
 
-    private DatabaseConnection() {
+    private DatabaseConnection() {}
 
-    }
+    public static Connection getConnection() throws SQLException
-
+    {
-    public static Connection getConnection()
+        return DriverManager.getConnection(URL, USER, PASSWORD);
-            throws SQLException {
-
-        // TODO:
-        // Return a valid PostgreSQL connection
-
-        return null;
     }
 
 }

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

@@ -0,0 +1,34 @@
+package dev.model;
+
+public class CartItem {
+
+    private MenuItem menuItem;
+
+    private int quantity;
+
+    public CartItem(MenuItem menuItem, int quantity)
+    {
+        this.menuItem = menuItem;
+        this.quantity = quantity;
+    }
+
+    public MenuItem getMenuItem()
+    {
+        return menuItem;
+    }
+
+    public void setMenuItem(MenuItem menuItem)
+    {
+        this.menuItem = menuItem;
+    }
+
+    public int getQuantity()
+    {
+        return quantity;
+    }
+
+    public void setQuantity(int quantity)
+    {
+        this.quantity = quantity;
+    }
+}

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

@@ -12,4 +12,75 @@ public class MenuItem {
 
     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;
+    }
+
+    @Override
+    public String toString()
+    {
+        return id + " - " + name + " ($" + price + ")";
+    }
 }

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

@@ -12,4 +12,68 @@ public class Order {
 
     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;
+    }
+
+    @Override
+    public String toString()
+    {
+        return "Order{" +
+                "id=" + id +
+                ", userId=" + userId +
+                ", createdAt=" + createdAt +
+                ", totalPrice=" + totalPrice +
+                '}';
+    }
 }

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

@@ -12,4 +12,80 @@ public class OrderDetail {
 
     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;
+    }
+
+    @Override
+    public String toString()
+    {
+        return "OrderDetail{" +
+                "id=" + id +
+                ", orderId=" + orderId +
+                ", menuItemId=" + menuItemId +
+                ", quantity=" + quantity +
+                ", price=" + price +
+                '}';
+    }
 }

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

@@ -10,4 +10,66 @@ public class User {
 
     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;
+    }
+
+    @Override
+    public String toString()
+    {
+        return "User{" +
+                "id=" + id +
+                ", username='" + username + '\'' +
+                ", email='" + email + '\'' +
+                '}';
+    }
 }

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

@@ -1,23 +1,53 @@
 package dev.service;
 
+import dev.dao.UserDao;
 import dev.model.User;
+import dev.util.PasswordUtil;
 
-public class AuthService {
+public class AuthService
+{
+    private final UserDao userDao = new UserDao();
 
-    public boolean register(String username, String password, String email) {
+    public boolean register(
+            String username,
+            String password,
+            String email)
+    {
+        User existingUser = userDao.findByUsername(username);
 
-        // TODO:
+        if (existingUser != null)
-        // Validate and register user
+        {
+            System.out.println("Username already exists.");
+            return false;
+        }
 
-        return false;
+        User user = new User();
+        user.setUsername(username);
+        user.setPassword(PasswordUtil.hash(password));
+        user.setEmail(email);
+
+        return userDao.save(user);
     }
 
-    public User login(String username, String password) {
+    public User login(
+            String username,
+            String password)
+    {
 
-        // TODO:
+        User user = userDao.findByUsername(username);
-        // Authenticate user
 
-        return null;
+        if (user == null)
+        {
+            System.out.println("Invalid username.");
+            return null;
+        }
+
+        if (!PasswordUtil.matches(password, user.getPassword()))
+        {
+            System.out.println("Invalid password.");
+            return null;
+        }
+
+        return user;
     }
-
 }

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

@@ -1,12 +1,31 @@
 package dev.service;
 
-public class MenuService {
+import dev.dao.MenuItemDao;
+import dev.model.MenuItem;
 
-    public void showMenu() {
+import java.util.List;
 
-        // TODO:
+public class MenuService
-        // Display menu items
+{
+    private final MenuItemDao menuItemDao = new MenuItemDao();
 
+    public void showMenu()
+    {
+        List<MenuItem> items = menuItemDao.findAll();
+
+        System.out.println();
+        System.out.println("========== MENU ==========");
+
+        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 +1,178 @@
 package dev.service;
 
+import dev.dao.MenuItemDao;
+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.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Scanner;
+
 public class OrderService {
 
-    public void placeOrder(int userId) {
+    private final Scanner scanner =
+            new Scanner(System.in);
 
-        // TODO:
+    private final MenuItemDao menuItemDao =
-        // Create order
+            new MenuItemDao();
 
+    private final OrderDao orderDao =
+            new OrderDao();
+
+    private final OrderDetailDao orderDetailDao =
+            new OrderDetailDao();
+
+    public void placeOrder(int userId)
+    {
+        List<CartItem> cart = new ArrayList<>();
+
+        while (true)
+        {
+            System.out.println();
+            System.out.println("Available Items:");
+
+            List<MenuItem> items = menuItemDao.findAll();
+
+            for (MenuItem item : items)
+            {
+                System.out.printf(
+                        "%d - %s - $%.2f%n",
+                        item.getId(),
+                        item.getName(),
+                        item.getPrice()
+                );
+            }
+
+            System.out.print("Enter item id (0 to finish): ");
+
+            int itemId = scanner.nextInt();
+
+            if (itemId == 0)
+                break;
+
+            MenuItem menuItem = menuItemDao.findById(itemId);
+
+            if (menuItem == null)
+            {
+                System.out.println("Invalid item id.");
+                continue;
+            }
+
+            System.out.print("Quantity: ");
+
+            int quantity = scanner.nextInt();
+
+            if (quantity <= 0)
+            {
+                System.out.println("Quantity must be positive.");
+                continue;
+            }
+
+            cart.add(new CartItem(menuItem, quantity));
+
+            System.out.println("Added successfully.");
+        }
+
+        if (cart.isEmpty())
+        {
+            System.out.println("No items selected.");
+            return;
+        }
+
+        double total = 0.0;
+
+        for (CartItem cartItem : cart)
+            total += cartItem.getMenuItem().getPrice() * cartItem.getQuantity();
+
+        Order order = new Order();
+
+        order.setUserId(userId);
+        order.setCreatedAt(LocalDateTime.now());
+        order.setTotalPrice(total);
+
+        int orderId = orderDao.save(order);
+
+        if (orderId == -1)
+        {
+            System.out.println("Failed to save order.");
+            return;
+        }
+
+        for (CartItem cartItem : cart)
+        {
+            OrderDetail detail = new OrderDetail();
+            detail.setOrderId(orderId);
+            detail.setMenuItemId(cartItem.getMenuItem().getId());
+            detail.setQuantity(cartItem.getQuantity());
+            detail.setPrice(cartItem.getMenuItem().getPrice());
+
+            orderDetailDao.save(detail);
+        }
+
+        System.out.println();
+        System.out.println("Order saved successfully.");
+
+        printReceipt(orderId);
     }
 
-    public void printReceipt(int orderId) {
+    public void printReceipt(int orderId)
+    {
+        List<OrderDetail> details = orderDetailDao.findByOrderId(orderId);
 
-        // TODO:
+        System.out.println();
-        // Print order receipt
+        System.out.println("========== RECEIPT ==========");
+        System.out.printf("%-15s %-8s %-10s %-10s%n", "Item", "Qty", "Unit", "Total");
+        System.out.println("------------------------------------------");
 
+        double grandTotal = 0;
+
+        for (OrderDetail detail : details)
+        {
+            MenuItem item = menuItemDao.findById(detail.getMenuItemId());
+            double subtotal = detail.getQuantity() * detail.getPrice();
+
+            grandTotal += subtotal;
+
+            System.out.printf(
+                    "%-15s %-8d %-10.2f %-10.2f%n",
+                    item.getName(),
+                    detail.getQuantity(),
+                    detail.getPrice(),
+                    subtotal
+            );
+        }
+
+        System.out.println("------------------------------------------");
+        System.out.printf("Final Total: %.2f%n", grandTotal);
+        System.out.println("==============================");
     }
 
-    public void showOrderHistory(int userId) {
+    public void showOrderHistory(int userId)
+    {
+        List<Order> orders = orderDao.findByUserId(userId);
 
-        // TODO:
+        if (orders.isEmpty())
-        // Display user's order history
+        {
+            System.out.println("No orders found.");
+            return;
+        }
 
+        System.out.println();
+        System.out.println("====== ORDER HISTORY ======");
+
+        for (Order order : orders)
+        {
+            System.out.printf(
+                    "Order #%d | %s | $%.2f%n",
+                    order.getId(),
+                    order.getCreatedAt(),
+                    order.getTotalPrice()
+            );
+        }
     }
-
 }

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

@@ -1,44 +1,138 @@
 package dev.ui;
 
+import dev.model.User;
+import dev.service.AuthService;
+import dev.service.MenuService;
+import dev.service.OrderService;
+
 import java.util.Scanner;
 
-public class ConsoleMenu {
+public class ConsoleMenu
-
+{
     private final Scanner scanner =
             new Scanner(System.in);
 
-    public void start() {
+    private final AuthService authService =
+            new AuthService();
 
-        while (true) {
+    private final MenuService menuService =
+            new MenuService();
 
+    private final OrderService orderService =
+            new OrderService();
+
+    public void start()
+    {
+        while (true)
+        {
             System.out.println();
-            System.out.println("===== JAVA PIZZERIA =====");
+            System.out.println("====================================");
+            System.out.println("           JAVA PIZZERIA            ");
+            System.out.println("====================================");
+
             System.out.println("1. Login");
             System.out.println("2. Register");
             System.out.println("3. Exit");
 
+            System.out.print("Choose option: ");
+
             int choice = scanner.nextInt();
 
-            switch (choice) {
+            scanner.nextLine();
 
-                case 1:
+            switch (choice)
-                    // TODO
+            {
-                    break;
+                case 1 -> login();
 
-                case 2:
+                case 2 -> register();
-                    // TODO
-                    break;
 
-                case 3:
+                case 3 ->
+                {
+                    System.out.println("Goodbye.");
                     return;
+                }
 
-                default:
+                default -> System.out.println("Invalid choice.");
-                    System.out.println("Invalid choice");
-
             }
-
         }
-
     }
 
+    private void register()
+    {
+        System.out.println();
+        System.out.println("===== REGISTER =====");
+
+        System.out.print("Username: ");
+        String username = scanner.nextLine();
+
+        System.out.print("Password: ");
+        String password = scanner.nextLine();
+
+        System.out.print("Email: ");
+        String email = scanner.nextLine();
+
+        boolean success = authService.register(username, password, email);
+
+        if (success)
+            System.out.println("Registration successful.");
+        else
+            System.out.println("Registration failed.");
+    }
+
+    private void login()
+    {
+        System.out.println();
+        System.out.println("===== LOGIN =====");
+
+        System.out.print("Username: ");
+        String username = scanner.nextLine();
+
+        System.out.print("Password: ");
+        String password = scanner.nextLine();
+
+        User user = authService.login(username, password);
+
+        if (user == null)
+        {
+            System.out.println("Login failed.");
+            return;
+        }
+
+        System.out.println("Welcome " + user.getUsername());
+        showUserMenu(user);
+    }
+
+    private void showUserMenu(User user)
+    {
+        while (true)
+        {
+            System.out.println();
+            System.out.println("========== MAIN MENU ==========");
+
+            System.out.println("1. View Menu");
+            System.out.println("2. Place Order");
+            System.out.println("3. View Order History");
+            System.out.println("4. Logout");
+
+            System.out.print("Choose option: ");
+
+            int choice = scanner.nextInt();
+
+            switch (choice)
+            {
+                case 1 -> menuService.showMenu();
+
+                case 2 -> orderService.placeOrder(user.getId());
+
+                case 3 -> orderService.showOrderHistory(user.getId());
+
+                case 4 ->
+                {
+                    return;
+                }
+
+                default -> System.out.println("Invalid choice.");
+            }
+        }
+    }
 }

src/main/java/dev/util/PasswordUtil.java

@@ -0,0 +1,34 @@
+package dev.util;
+
+import java.nio.charset.StandardCharsets;
+import java.security.MessageDigest;
+
+public class PasswordUtil
+{
+    private PasswordUtil() {}
+
+    public static String hash(String password)
+    {
+        try
+        {
+            MessageDigest md = MessageDigest.getInstance("SHA-256");
+            byte[] hash = md.digest(password.getBytes(StandardCharsets.UTF_8));
+            StringBuilder sb = new StringBuilder();
+
+            for (byte b : hash)
+                sb.append(String.format("%02x", b));
+
+            return sb.toString();
+
+        }
+        catch (Exception e)
+        {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public static boolean matches(String rawPassword, String hashedPassword)
+    {
+        return hash(rawPassword).equals(hashedPassword);
+    }
+}