.idea/.gitignore

@@ -0,0 +1,10 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Ignored default folder with query files
+/queries/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
+# Editor-based HTTP Client requests
+/httpRequests/

.idea/compiler.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <annotationProcessing>
+      <profile name="Maven default annotation processors profile" enabled="true">
+        <sourceOutputDir name="target/generated-sources/annotations" />
+        <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
+        <outputRelativeToContentRoot value="true" />
+        <module name="WS-10-Database" />
+      </profile>
+    </annotationProcessing>
+  </component>
+</project>

.idea/dataSources.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="DataSourceManagerImpl" format="xml" multifile-model="true">
+    <data-source source="LOCAL" name="postgres@localhost" uuid="7eaa055b-aec6-4a3e-a6f8-6ca90a4ee622">
+      <driver-ref>postgresql</driver-ref>
+      <synchronize>true</synchronize>
+      <jdbc-driver>org.postgresql.Driver</jdbc-driver>
+      <jdbc-url>jdbc:postgresql://localhost:5432/postgres</jdbc-url>
+      <working-dir>$ProjectFileDir$</working-dir>
+    </data-source>
+  </component>
+</project>

.idea/encodings.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
+  </component>
+</project>

.idea/jarRepositories.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RemoteRepositoriesConfiguration">
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Maven Central repository" />
+      <option name="url" value="https://repo1.maven.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="jboss.community" />
+      <option name="name" value="JBoss Community repository" />
+      <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Central Repository" />
+      <option name="url" value="https://maven.myket.ir" />
+    </remote-repository>
+  </component>
+</project>

.idea/misc.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
+      <list>
+        <option value="$PROJECT_DIR$/pom.xml" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_25" default="true" project-jdk-name="25" project-jdk-type="JavaSDK" />
+</project>

.idea/sqldialects.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="SqlDialectMappings">
+    <file url="file://$PROJECT_DIR$/database.sql" dialect="GenericSQL" />
+  </component>
+</project>

.idea/vcs.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

database.sql

@@ -1,141 +1,80 @@
--- 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 VARCHAR(255) NOT NULL,
+    email VARCHAR(100)
+);
 
-
-
--- =======================================================
 -- 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(100) NOT NULL,
+    description TEXT,
+    price DECIMAL(10,2) 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 orders (
+    id SERIAL PRIMARY KEY,
+    user_id INT NOT NULL,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    total_price DECIMAL(10, 2) NOT NULL DEFAULT 0.00,
+    CONSTRAINT fk_user_order FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+);
 
-
-
--- =======================================================
 -- 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_item_id INT NOT NULL,
+    quantity INT NOT NULL CHECK (quantity>0),
+    price_at_purchase DECIMAL(10,2) NOT NULL,
+    CONSTRAINT fk_detail_order FOREIGN KEY (order_id) REFERENCES orders(id) ON DELETE CASCADE,
+    CONSTRAINT fk_detail_menu FOREIGN KEY (menu_item_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
+('Cheeseburger', 'Juicy beef patty with cheddar cheese', 8.99, 'Food'),
+('Pepperoni Pizza', 'Classic pizza with pepperoni and mozzarella', 12.50, 'Food'),
+('Iced Latte', 'Espresso with cold milk and ice', 4.25, 'Drink');
 
 
-
--- =======================================================
 -- OPTIONAL TEST DATA
--- =======================================================
---
--- You may insert sample users and orders for testing.
--- This section is optional.
---
--- INSERT INTO ...
+INSERT INTO users (username, password, email) VALUES
+('mardin_dev', 'hashed_pass_123', 'mardin@example.com'),
+('sara_kh', 'hashed_pass_456', 'sara@example.com');
+
+INSERT INTO orders (user_id, total_price) VALUES
+(1, 21.49),
+(2, 4.25);
+
+INSERT INTO order_details (order_id, menu_item_id, quantity, price_at_purchase) VALUES
+(1, 1, 1, 8.99),
+(1, 2, 1, 12.50);
+
+INSERT INTO order_details (order_id, menu_item_id, quantity, price_at_purchase) VALUES
+(2, 3, 1, 4.25);
 
 
-
--- =======================================================
 -- VERIFICATION QUERIES
--- =======================================================
---
--- Uncomment these queries to verify your database.
---
--- SELECT * FROM ...;
--- SELECT * FROM ...;
--- SELECT * FROM ...;
--- SELECT * FROM ...;
+SELECT * FROM users;
+SELECT * FROM menu_items;
+SELECT * FROM orders;
+SELECT * FROM order_details;
+
+SELECT
+    o.id AS order_number,
+    u.username AS customer,
+    m.name AS food_item,
+    od.quantity,
+    od.price_at_purchase,
+    (od.quantity * od.price_at_purchase) AS subtotal,
+    o.created_at
+FROM orders o
+         JOIN users u ON o.user_id = u.id
+         JOIN order_details od ON od.order_id = o.id
+         JOIN menu_items m ON od.menu_item_id = m.id;

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

@@ -1,23 +1,60 @@
 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 List<MenuItem> findAll() {
+        List<MenuItem> items = new ArrayList<>();
+        String sql = "select * FROM menu_item";
 
-        // TODO:
-        // Retrieve all menu items
+        try (Connection connection = DatabaseConnection.getConnection();
+             Statement statement = connection.createStatement();
+             ResultSet resultSet = statement.executeQuery(sql)
+        ) {
+            while (resultSet.next()) {
+                MenuItem item = new MenuItem(
+                        resultSet.getInt("id"),
+                        resultSet.getString("name"),
+                        resultSet.getString("description"),
+                        resultSet.getDouble("price"),
+                        resultSet.getString("category")
+                );
+                items.add(item);
+            }
+        } catch (SQLException e) {
+            System.err.println("Error fetching menu items: " + e.getMessage());
+        }
 
-        return null;
+        return items;
     }
 
     public MenuItem findById(int id) {
+        String sql = "SELECT * FROM menu_items WHERE id = ?";
 
-        // TODO:
-        // Find menu item by id
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement pstmt = conn.prepareStatement(sql)) {
+
+            pstmt.setInt(1, id);
+            try (ResultSet rs = pstmt.executeQuery()) {
+                if (rs.next()) {
+                    return new MenuItem(
+                            rs.getInt("id"),
+                            rs.getString("name"),
+                            rs.getString("description"),
+                            rs.getDouble("price"),
+                            rs.getString("category")
+                    );
+                }
+            }
+        } catch (SQLException e) {
+            System.err.println("Error finding menu item: " + e.getMessage());
+        }
 
         return null;
     }

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

@@ -1,25 +1,61 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
 import dev.model.Order;
 
+import java.sql.*;
+import java.util.ArrayList;
 import java.util.List;
 
 public class OrderDao {
 
     public int save(Order order) {
 
-        // TODO:
-        // Insert order and return generated id
+        String sql = "INSERT INTO orders (user_id, total_price) VALUES (?, ?)";
 
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement pstmt = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS)) {
+
+            pstmt.setInt(1, order.getUserId());
+            pstmt.setDouble(2, order.getTotalPrice());
+            pstmt.executeUpdate();
+
+            //Generated ID
+            try (ResultSet rs = pstmt.getGeneratedKeys()) {
+                if (rs.next()) {
+                    return rs.getInt(1);
+                }
+            }
+        } catch (SQLException e) {
+            System.err.println("Error saving order: " + e.getMessage());
+        }
         return -1;
     }
 
     public List<Order> findByUserId(int userId) {
+        List<Order> orders = new ArrayList<>();
+        String sql = "SELECT * FROM orders WHERE user_id = ? ORDER BY created_at DESC";
 
-        // TODO:
-        // Retrieve all orders of a user
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement pstmt = conn.prepareStatement(sql)) {
 
-        return null;
+            pstmt.setInt(1, userId);
+
+            try (ResultSet rs = pstmt.executeQuery()) {
+                while (rs.next()) {
+                    Order order = new Order(
+                            rs.getInt("id"),
+                            rs.getInt("user_id"),
+                            rs.getTimestamp("created_at"),
+                            rs.getDouble("total_price")
+                    );
+                    orders.add(order);
+                }
+            }
+        } catch (SQLException e) {
+            System.err.println("Error retrieving orders for user: " + e.getMessage());
+        }
+        return orders;
     }
 
 }

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

@@ -1,24 +1,62 @@
 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, price_at_purchase) VALUES (?, ?, ?, ?)";
 
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement pstmt = conn.prepareStatement(sql)) {
+
+            pstmt.setInt(1, detail.getOrderId());
+            pstmt.setInt(2, detail.getMenuItemId());
+            pstmt.setInt(3, detail.getQuantity());
+            pstmt.setDouble(4, detail.getPriceAtPurchase());
+
+            pstmt.executeUpdate();
+
+        } catch (SQLException e) {
+            System.err.println("Error saving order detail: " + e.getMessage());
+        }
     }
 
     public List<OrderDetail> findByOrderId(int orderId) {
 
-        // TODO:
-        // Retrieve order details
+        List<OrderDetail> details = new ArrayList<>();
+        String sql = "SELECT * FROM order_details WHERE order_id = ?";
 
-        return null;
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement pstmt = conn.prepareStatement(sql)) {
+
+            pstmt.setInt(1, orderId);
+
+            try (ResultSet rs = pstmt.executeQuery()) {
+                while (rs.next()) {
+                    OrderDetail detail = new OrderDetail(
+                            rs.getInt("id"),
+                            rs.getInt("order_id"),
+                            rs.getInt("menu_item_id"),
+                            rs.getInt("quantity"),
+                            rs.getDouble("price_at_purchase")
+                    );
+                    details.add(detail);
+                }
+            }
+        } catch (SQLException e) {
+            System.err.println("Error retrieving order details: " + e.getMessage());
+        }
+        return details;
     }
 
 }

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

@@ -1,22 +1,59 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
 import dev.model.User;
 
+import java.sql.*;
+
 public class UserDao {
 
     public boolean save(User user) {
 
-        // TODO:
-        // Insert user into database
+        String sql = "INSERT INTO users (username, password, email) VALUES (?, ?, ?)";
 
-        return false;
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement pstmt = conn.prepareStatement(sql)) {
+
+            pstmt.setString(1, user.getUsername());
+            pstmt.setString(2, user.getPassword());
+
+            if (user.getEmail() == null || user.getEmail().trim().isEmpty()) {
+                pstmt.setNull(3, Types.VARCHAR);
+            } else {
+                pstmt.setString(3, user.getEmail());
+            }
+
+            int rowsAffected = pstmt.executeUpdate();
+            return rowsAffected > 0;
+
+        } catch (SQLException e) {
+            System.err.println("Error saving user: " + e.getMessage());
+            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 pstmt = conn.prepareStatement(sql)) {
+
+            pstmt.setString(1, username);
+
+            try (ResultSet rs = pstmt.executeQuery()) {
+                if (rs.next()) {
+                    return new User(
+                            rs.getInt("id"),
+                            rs.getString("username"),
+                            rs.getString("password"),
+                            rs.getString("email")
+                    );
+                }
+            }
+        } catch (SQLException e) {
+            System.err.println("Error finding user by username: " + e.getMessage());
+        }
         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 {
@@ -17,11 +18,7 @@ public class DatabaseConnection {
 
     public static Connection getConnection()
             throws SQLException {
-
-        // TODO:
-        // Return a valid PostgreSQL connection
-
-        return null;
+        return DriverManager.getConnection(URL, USER, PASSWORD);
     }
 
 }

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

@@ -12,4 +12,31 @@ public class MenuItem {
 
     private String category;
 
+    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 String getDescription() {
+        return this.description;
+    }
+
+    public int getId() {
+        return this.id;
+    }
+
+    public String getName() {
+        return this.name;
+    }
+
+    public double getPrice() {
+        return this.price;
+    }
+
+    public String getCategory() {
+        return this.category;
+    }
 }

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

@@ -1,5 +1,6 @@
 package dev.model;
 
+import java.sql.Timestamp;
 import java.time.LocalDateTime;
 
 public class Order {
@@ -12,4 +13,18 @@ public class Order {
 
     private double totalPrice;
 
+    public Order(int id, int userId, Timestamp createdAt, double totalPrice) {
+        this.id = id;
+        this.userId = userId;
+        this.createdAt = createdAt.toLocalDateTime();
+        this.totalPrice = totalPrice;
+    }
+
+    public int getUserId() {
+        return userId;
+    }
+
+    public double getTotalPrice() {
+        return totalPrice;
+    }
 }

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

@@ -12,4 +12,27 @@ public class OrderDetail {
 
     private double price;
 
+    public OrderDetail(int id, int orderId, int menuItemId, int quantity, double priceAtPurchase) {
+        this.id = id;
+        this.orderId = orderId;
+        this.menuItemId = menuItemId;
+        this.quantity = quantity;
+        this.price = priceAtPurchase;
+    }
+
+    public int getOrderId() {
+        return orderId;
+    }
+
+    public int getMenuItemId() {
+        return menuItemId;
+    }
+
+    public int getQuantity() {
+        return quantity;
+    }
+
+    public double getPriceAtPurchase() {
+        return price;
+    }
 }

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

@@ -10,4 +10,26 @@ public class User {
 
     private String email;
 
+    public User(int id, String username, String password, String email) {
+        this.id = id;
+        this.username = username;
+        this.password = password;
+        this.email = email;
+    }
+
+    public String getUsername() {
+        return this.username;
+    }
+
+    public int getId() {
+        return this.id;
+    }
+
+    public String getEmail() {
+        return this.email;
+    }
+
+    public String getPassword() {
+        return this.password;
+    }
 }

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

@@ -1,23 +1,75 @@
 package dev.service;
 
+import dev.database.DatabaseConnection;
 import dev.model.User;
 
+import java.security.MessageDigest;
+import java.sql.*;
+import java.util.Base64;
+
 public class AuthService {
 
+    private String hashPassword(String password) {
+        try {
+            MessageDigest digest = MessageDigest.getInstance("SHA-256");
+            byte[] hash = digest.digest(password.getBytes("UTF-8"));
+            return Base64.getEncoder().encodeToString(hash);
+        } catch (Exception e) {
+            throw new RuntimeException("Hashing failed", e);
+        }
+    }
+
     public boolean register(String username, String password, String email) {
 
-        // TODO:
-        // Validate and register user
+        if (username == null || username.trim().isEmpty() || password == null || password.isEmpty()) {
+            System.out.println("Username and password cannot be empty.");
+            return false;
+        }
 
-        return false;
+        String sql = "INSERT INTO users (username, password, email) VALUES (?, ?, ?)";
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement pstmt = conn.prepareStatement(sql)) {
+
+            pstmt.setString(1, username);
+            pstmt.setString(2, hashPassword(password));
+            if (email == null || email.trim().isEmpty()) {
+                pstmt.setNull(3, Types.VARCHAR);
+            } else {
+                pstmt.setString(3, email);
+            }
+
+            pstmt.executeUpdate();
+            return true;
+        } catch (SQLException e) {
+            System.out.println("Registration failed (Username might already exist): " + e.getMessage());
+            return false;
+        }
     }
 
     public User login(String username, String password) {
 
-        // TODO:
-        // Authenticate user
+        String sql = "SELECT * FROM users WHERE username = ? AND password = ?";
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement pstmt = conn.prepareStatement(sql)) {
 
+            pstmt.setString(1, username);
+            pstmt.setString(2, hashPassword(password));
+
+            try (ResultSet rs = pstmt.executeQuery()) {
+                if (rs.next()) {
+                    return new User(
+                            rs.getInt("id"),
+                            rs.getString("username"),
+                            rs.getString("password"),
+                            rs.getString("email")
+                    );
+                }
+            }
+        } catch (SQLException e) {
+            System.out.println("Login error: " + e.getMessage());
+        }
         return null;
+
     }
 
 }

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

@@ -1,12 +1,27 @@
 package dev.service;
 
+import dev.dao.MenuItemDao;
+import dev.model.MenuItem;
+
+import java.util.List;
+
 public class MenuService {
 
     public void showMenu() {
+        final MenuItemDao menuItemDao = new MenuItemDao();
 
-        // TODO:
-        // Display menu items
-
+        List<MenuItem> items = menuItemDao.findAll();
+        if (items.isEmpty()) {
+            System.out.println("The menu is currently empty.");
+            return;
+        }
+        System.out.println("\n===== MENU =====");
+        for (MenuItem item : items) {
+            System.out.printf("[%d] %s - $%.2f (%s)\n", item.getId(), item.getName(), item.getPrice(), item.getCategory());
+            if (item.getDescription() != null) {
+                System.out.println("    " + item.getDescription());
+            }
+        }
     }
 
 }

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

@@ -1,26 +1,158 @@
 package dev.service;
 
+import dev.dao.MenuItemDao;
+import dev.database.DatabaseConnection;
+import dev.model.MenuItem;
+
+import java.sql.*;
+import java.util.Scanner;
+
 public class OrderService {
+    private final MenuItemDao menuItemDao = new MenuItemDao();
+    private final Scanner scanner = new Scanner(System.in);
 
     public void placeOrder(int userId) {
+        Connection conn = null;
+        try {
+            conn = DatabaseConnection.getConnection();
+            conn.setAutoCommit(false);
 
-        // TODO:
-        // Create order
+            String insertOrderSql = "INSERT INTO orders (user_id, total_price) VALUES (?, 0.00)";
+            PreparedStatement orderStmt = conn.prepareStatement(insertOrderSql, Statement.RETURN_GENERATED_KEYS);
+            orderStmt.setInt(1, userId);
+            orderStmt.executeUpdate();
 
+            ResultSet generatedKeys = orderStmt.getGeneratedKeys();
+            int orderId = 0;
+            if (generatedKeys.next()) {
+                orderId = generatedKeys.getInt(1);
+            }
+
+            double grandTotal = 0.0;
+            boolean addingItems = true;
+            String insertDetailSql = "INSERT INTO order_details (order_id, menu_item_id, quantity, price_at_purchase) VALUES (?, ?, ?, ?)";
+            PreparedStatement detailStmt = conn.prepareStatement(insertDetailSql);
+
+            while (addingItems) {
+                System.out.print("Enter Menu Item ID to add (or 0 to finish): ");
+                int itemId = scanner.nextInt();
+                if (itemId == 0) {
+                    addingItems = false;
+                    continue;
+                }
+
+                MenuItem item = menuItemDao.findById(itemId);
+                if (item == null) {
+                    System.out.println("Invalid Item ID. Try again.");
+                    continue;
+                }
+
+                System.out.print("Enter quantity: ");
+                int quantity = scanner.nextInt();
+                if (quantity <= 0) {
+                    System.out.println("Quantity must be greater than zero.");
+                    continue;
+                }
+
+                double subtotal = (item.getPrice()) * quantity;
+                grandTotal += subtotal;
+
+                detailStmt.setInt(1, orderId);
+                detailStmt.setInt(2, item.getId());
+                detailStmt.setInt(3, quantity);
+                detailStmt.setDouble(4, item.getPrice());
+                detailStmt.executeUpdate();
+            }
+
+            if (grandTotal == 0.0) {
+                System.out.println("No items selected. Canceling order.");
+                conn.rollback();
+                return;
+            }
+
+            String updateOrderSql = "UPDATE orders SET total_price = ? WHERE id = ?";
+            PreparedStatement updateStmt = conn.prepareStatement(updateOrderSql);
+            updateStmt.setDouble(1, grandTotal);
+            updateStmt.setInt(2, orderId);
+            updateStmt.executeUpdate();
+
+            conn.commit();
+            System.out.println("Order successfully saved!");
+            printReceipt(orderId);
+
+        } catch (SQLException e) {
+            System.out.println("Order failed: " + e.getMessage());
+            if (conn != null) {
+                try { conn.rollback(); } catch (SQLException ex) { ex.printStackTrace(); }
+            }
+        }
     }
 
     public void printReceipt(int orderId) {
 
-        // TODO:
-        // Print order receipt
+        String sql = "SELECT od.quantity, od.price_at_purchase, m.name, o.total_price " +
+                "FROM order_details od " +
+                "JOIN menu_items m ON od.menu_item_id = m.id " +
+                "JOIN orders o ON od.order_id = o.id " +
+                "WHERE od.order_id = ?";
 
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement pstmt = conn.prepareStatement(sql)) {
+
+            pstmt.setInt(1, orderId);
+            try (ResultSet rs = pstmt.executeQuery()) {
+                System.out.println("\n========= RECEIPT (Order #" + orderId + ") =========");
+                double grandTotal = 0.0;
+                boolean hasRows = false;
+
+                while (rs.next()) {
+                    hasRows = true;
+                    String name = rs.getString("name");
+                    int qty = rs.getInt("quantity");
+                    double price = rs.getDouble("price_at_purchase");
+                    double subtotal = qty * price;
+                    grandTotal = rs.getDouble("total_price");
+
+                    System.out.printf("- %s x%d @ $%.2f = $%.2f\n", name, qty, price, subtotal);
+                }
+                if (!hasRows) {
+                    System.out.println("Order not found.");
+                    return;
+                }
+                System.out.println("----------------------------------------");
+                System.out.printf("GRAND TOTAL: $%.2f\n", grandTotal);
+                System.out.println("========================================");
+            }
+        } catch (SQLException e) {
+            System.out.println("Error generating receipt: " + e.getMessage());
+        }
     }
 
     public void showOrderHistory(int userId) {
+        String sql = "SELECT id, created_at, total_price FROM orders WHERE user_id = ? ORDER BY created_at DESC";
 
-        // TODO:
-        // Display user's order history
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement pstmt = conn.prepareStatement(sql)) {
 
+            pstmt.setInt(1, userId);
+            try (ResultSet rs = pstmt.executeQuery()) {
+                System.out.println("\n===== YOUR ORDER HISTORY =====");
+                boolean hasHistory = false;
+                while (rs.next()) {
+                    hasHistory = true;
+                    System.out.printf("Order #%d | Date: %s | Total Spent: $%.2f\n",
+                            rs.getInt("id"),
+                            rs.getTimestamp("created_at").toString(),
+                            rs.getDouble("total_price")
+                    );
+                }
+                if (!hasHistory) {
+                    System.out.println("You haven't placed any orders yet.");
+                }
+            }
+        } catch (SQLException e) {
+            System.out.println("Error fetching history: " + e.getMessage());
+        }
     }
 
 }

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

@@ -1,11 +1,20 @@
 package dev.ui;
 
+import dev.model.MenuItem;
+import dev.model.User;
+import dev.service.AuthService;
+import dev.service.MenuService;
+import dev.service.OrderService;
+
 import java.util.Scanner;
 
 public class ConsoleMenu {
 
     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();
 
     public void start() {
 
@@ -22,11 +31,11 @@ public class ConsoleMenu {
             switch (choice) {
 
                 case 1:
-                    // TODO
+                    handleLogin();
                     break;
 
                 case 2:
-                    // TODO
+                    handleRegister();
                     break;
 
                 case 3:
@@ -41,4 +50,64 @@ public class ConsoleMenu {
 
     }
 
+    private void handleRegister() {
+        System.out.print("Choose Username: ");
+        String user = scanner.nextLine();
+        System.out.print("Choose Password: ");
+        String pass = scanner.nextLine();
+        System.out.print("Email (Optional, press Enter to skip): ");
+        String email = scanner.nextLine();
+
+        if (authService.register(user, pass, email)) {
+            System.out.println("Registration successful! You can now log in.");
+        }
+    }
+
+    private void handleLogin() {
+        System.out.print("Username: ");
+        String user = scanner.nextLine();
+        System.out.print("Password: ");
+        String pass = scanner.nextLine();
+
+        User loggedInUser = authService.login(user, pass);
+        if (loggedInUser != null) {
+            System.out.println("Welcome back, " + loggedInUser.getUsername() + "!");
+            showCustomerDashboard(loggedInUser);
+        } else {
+            System.out.println("Invalid username or password.");
+        }
+    }
+
+    private void showCustomerDashboard(User user) {
+        while (true) {
+            System.out.println("\n===== CUSTOMER MENU =====");
+            System.out.println("1. Browse Menu");
+            System.out.println("2. Place 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:
+                    menuService.showMenu();
+                    orderService.placeOrder(user.getId());
+                    break;
+                case 3:
+                    orderService.showOrderHistory(user.getId());
+                    break;
+                case 4:
+                    System.out.println("Logged out successfully.");
+                    return;
+                default:
+                    System.out.println("Invalid choice.");
+            }
+        }
+    }
+
 }