false

src/main/java/dev/Main.java

@@ -1,12 +1,29 @@
 package dev;
 
+import dev.dao.MenuItemDao;
+import dev.dao.OrderDao;
+import dev.dao.OrderDetailDao;
+import dev.dao.UserDao;
+import dev.service.AuthService;
+import dev.service.MenuService;
+import dev.service.OrderService;
 import dev.ui.ConsoleMenu;
 
 public class Main {
 
     public static void main(String[] args) {
 
-        ConsoleMenu menu = new ConsoleMenu();
+        UserDao userDao = new UserDao();
+        MenuItemDao menuItemDao = new MenuItemDao();
+        OrderDao orderDao = new OrderDao();
+        OrderDetailDao orderDetailDao = new OrderDetailDao();
+
+        AuthService authService = new AuthService(userDao);
+        MenuService menuService = new MenuService(menuItemDao);
+        OrderService orderService = new OrderService(orderDao, orderDetailDao, menuItemDao);
+
+
+        ConsoleMenu menu = new ConsoleMenu(authService, menuService, orderService);
         menu.start();
 
     }

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

@@ -1,25 +1,59 @@
 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_items";
 
-        // TODO:
-        // Retrieve all menu items
+        try (Connection conn = DatabaseConnection.getConnection();
+             Statement stmt = conn.createStatement();
+             ResultSet rs = stmt.executeQuery(sql)){
 
-        return null;
+            while (rs.next()){
+                items.add(new MenuItem(
+                        rs.getInt("id"),
+                        rs.getString("name"),
+                        rs.getString("description"),
+                        rs.getDouble("price"),
+                        rs.getString("category")
+                ));
+            }
+
+        } catch (SQLException e) {
+            System.err.println("Error fetching menu: " + e.getMessage());
+        }
+        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);
+            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 +1,56 @@
 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) {
+        String sql = "INSERT INTO orders (user_id, total_price) VALUES (?, ?) RETURNING id";
 
-        // TODO:
-        // Insert order and return generated id
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement pstmt = conn.prepareStatement(sql)) {
 
+             pstmt.setInt(1, order.getUserId());
+             pstmt.setDouble(2, order.getTotalPrice());
+
+            try (ResultSet rs = pstmt.executeQuery()) {
+                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);
+            ResultSet rs = pstmt.executeQuery();
+
+            while (rs.next()){
+                Order order = new Order(
+                        rs.getInt("id"),
+                        rs.getInt("user_id"),
+                        rs.getTimestamp("created_at").toLocalDateTime(),
+                        rs.getDouble("total_price")
+                );
+                orders.add(order);
+            }
+        } catch (SQLException e) {
+            System.err.println("Error fetching order history: " + e.getMessage());
+        }
+        return orders;
     }
-
 }

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

@@ -1,24 +1,57 @@
 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) {
+        String sql = "INSERT INTO order_details (order_id, menu_item_id, quantity, unit_price) VALUES (?, ?, ?)";
 
-        // TODO:
-        // Insert order detail
+        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.getPrice());
+
+            pstmt.executeUpdate();
+
+        } catch (SQLException e) {
+            System.err.println("Error saving order detail: " + e.getMessage());
+        }
     }
 
     public List<OrderDetail> findByOrderId(int orderId) {
+        List<OrderDetail> details = new ArrayList<>();
+        String sql = "SELECT * FROM order_details WHERE order_id = ?";
 
-        // TODO:
-        // Retrieve order details
+        try (Connection conn = DatabaseConnection.getConnection();
+            PreparedStatement pstmt = conn.prepareStatement(sql)){
 
-        return null;
+            pstmt.setInt(1, orderId);
+            ResultSet rs = pstmt.executeQuery();
+
+            while (rs.next()){
+                details.add(new OrderDetail(
+                        rs.getInt("id"),
+                        rs.getInt("order_id"),
+                        rs.getInt("menu_item_id"),
+                        rs.getInt("quantity"),
+                        rs.getDouble("unit_price")
+                ));
+            }
+        } catch (SQLException e) {
+            System.err.println("Error fetching order details: " + e.getMessage());
+        }
+        return details;
     }
-
 }

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

@@ -1,23 +1,51 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
 import dev.model.User;
 
+import java.sql.*;
+
 public class UserDao {
 
     public boolean save(User user) {
+        String sql = "INSERT INTO users (username, password, email) VALUES (?, ?, ?)";
 
-        // TODO:
-        // Insert user into database
+        try(Connection conn = DatabaseConnection.getConnection();
+            PreparedStatement pstmt = conn.prepareStatement(sql)){
 
-        return false;
+            pstmt.setString(1, user.getUsername());
+            pstmt.setString(2, user.getPassword());
+            pstmt.setString(3, user.getEmail());
+
+            int affectedRows = pstmt.executeUpdate();
+            return affectedRows > 0;
+
+        }catch (SQLException e) {
+            System.err.println("Error saving user: " + e.getMessage());
+            return false;
+        }
     }
 
     public User findByUsername(String username) {
+        String sql = "SELECT * FROM users WHERE username = ?";
 
-        // TODO:
-        // Find a user by username
+        try(Connection conn = DatabaseConnection.getConnection();
+            PreparedStatement pstmt = conn.prepareStatement(sql)){
 
+            pstmt.setString(1, username);
+            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: " + e.getMessage());
+        }
         return null;
     }
-
 }

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

@@ -1,15 +1,14 @@
 package dev.database;
 
 import java.sql.Connection;
+import java.sql.DriverManager;
 import java.sql.SQLException;
 
 public class DatabaseConnection {
 
-    private static final String URL = "jdbc:postgresql://localhost:5432/restaurant_db"; // DB Server
-
-    private static final String USER = "postgres"; // Your Username
-
-    private static final String PASSWORD = "password"; // Your Password
+    private static final String URL = "jdbc:postgresql://localhost:5432/restaurant_db";
+    private static final String USER = "postgres";
+    private static final String PASSWORD = "Zahra1386";
 
     private DatabaseConnection() {
 
@@ -17,11 +16,6 @@ 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

@@ -3,13 +3,38 @@ package dev.model;
 public class MenuItem {
 
     private int id;
-
     private String name;
-
     private String description;
-
     private double price;
-
     private String category;
 
+    public MenuItem() {}
+
+    public MenuItem(int id, String name, String description, double price, String category) {
+        this.id = id;
+        this.name = name;
+        this.description = description;
+        this.price = price;
+        this.category = category;
+    }
+
+    public int getId() { return id; }
+    public void setId(int id) { this.id = id; }
+
+    public String getName() { return name; }
+    public void setName(String name) { this.name = name; }
+
+    public String getDescription() { return description; }
+    public void setDescription(String description) { this.description = description; }
+
+    public double getPrice() { return price; }
+    public void setPrice(double price) { this.price = price; }
+
+    public String getCategory() { return category; }
+    public void setCategory(String category) { this.category = category; }
+
+    @Override
+    public String toString() {
+        return String.format("%d. %s - $%.2f (%s)", id, name, price, category);
+    }
 }

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

@@ -5,11 +5,28 @@ import java.time.LocalDateTime;
 public class Order {
 
     private int id;
-
     private int userId;
-
     private LocalDateTime createdAt;
-
     private double totalPrice;
 
+    public Order() {}
+
+    public Order(int id, int userId, LocalDateTime createdAt, double totalPrice) {
+        this.id = id;
+        this.userId = userId;
+        this.createdAt = createdAt;
+        this.totalPrice = totalPrice;
+    }
+
+    public int getId() { return id; }
+    public void setId(int id) { this.id = id; }
+
+    public int getUserId() { return userId; }
+    public void setUserId(int userId) { this.userId = userId; }
+
+    public LocalDateTime getCreatedAt() { return createdAt; }
+    public void setCreatedAt(LocalDateTime createdAt) { this.createdAt = createdAt; }
+
+    public double getTotalPrice() { return totalPrice; }
+    public void setTotalPrice(double totalPrice) { this.totalPrice = totalPrice; }
 }

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

@@ -3,13 +3,33 @@ package dev.model;
 public class OrderDetail {
 
     private int id;
-
     private int orderId;
-
     private int menuItemId;
-
     private int quantity;
-
     private double price;
 
+    public OrderDetail() {}
+
+    public OrderDetail(int id, int orderId, int menuItemId, int quantity, double price) {
+        this.id = id;
+        this.orderId = orderId;
+        this.menuItemId = menuItemId;
+        this.quantity = quantity;
+        this.price = price;
+    }
+
+    public int getId() { return id; }
+    public void setId(int id) { this.id = id; }
+
+    public int getOrderId() { return orderId; }
+    public void setOrderId(int orderId) { this.orderId = orderId; }
+
+    public int getMenuItemId() { return menuItemId; }
+    public void setMenuItemId(int menuItemId) { this.menuItemId = menuItemId; }
+
+    public int getQuantity() { return quantity; }
+    public void setQuantity(int quantity) { this.quantity = quantity; }
+
+    public double getPrice() { return price; }
+    public void setPrice(double price) { this.price = price; }
 }

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

@@ -3,11 +3,28 @@ package dev.model;
 public class User {
 
     private int id;
-
     private String username;
-
     private String password;
-
     private String email;
 
+    public User() {}
+
+    public User(int id, String username, String password, String email) {
+        this.id = id;
+        this.username = username;
+        this.password = password;
+        this.email = email;
+    }
+
+    public int getId() { return id; }
+    public void setId(int id) { this.id = id; }
+
+    public String getUsername() { return username; }
+    public void setUsername(String username) { this.username = username; }
+
+    public String getPassword() { return password; }
+    public void setPassword(String password) { this.password = password; }
+
+    public String getEmail() { return email; }
+    public void setEmail(String email) { this.email = email; }
 }

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

@@ -1,23 +1,30 @@
 package dev.service;
 
+import dev.dao.UserDao;
 import dev.model.User;
 
 public class AuthService {
 
+    private final UserDao userDao = new UserDao();
+
+    public AuthService(UserDao userDao) {}
+
     public boolean register(String username, String password, String email) {
+        String hashedPassword = Integer.toHexString(password.hashCode());
+        User user = new User(0, username, hashedPassword, email);
 
-        // TODO:
-        // Validate and register user
-
-        return false;
+        return userDao.save(user);
     }
 
     public User login(String username, String password) {
+        User user = userDao.findByUsername(username);
 
-        // TODO:
-        // Authenticate user
-
+        if (user != null ){
+            String hashedInput = Integer.toHexString(password.hashCode());
+            if (user.getPassword().equals(hashedInput)){
+                return user;
+            }
+        }
         return null;
     }
-
 }

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

@@ -1,12 +1,47 @@
 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 {
+    private final MenuItemDao menuItemDao;
+    private Scanner scanner = new Scanner(System.in);
+    private User currentUsers;
 
-    public void showMenu() {
-
-        // TODO:
-        // Display menu items
-
+    public MenuService(MenuItemDao menuItemDao) {
+        this.menuItemDao = menuItemDao;
+        this.scanner = scanner;
     }
 
+    public void setCurrentUsers(User user){
+        this.currentUsers = user;
+    }
+
+    public void logout(){
+        this.currentUsers = null;
+    }
+
+    public void showMenuItems() {
+        if (currentUsers == null) {
+            System.out.println(" Please login first!");
+            return;
+        }
+
+        List<MenuItem> items = menuItemDao.findAll();
+        if (items.isEmpty()) {
+            System.out.println("No menu items available.");
+            return;
+        }
+
+        System.out.println("\n--- 🍴 RESTAURANT MENU ---");
+        for (MenuItem item : items) {
+            System.out.println(item.toString());
+            System.out.println("   " + item.getDescription());
+        }
+        System.out.println("---------------------------");
+    }
 }

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

@@ -1,26 +1,133 @@
 package dev.service;
 
+import dev.dao.MenuItemDao;
+import dev.dao.OrderDao;
+import dev.dao.OrderDetailDao;
+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 {
+    private final OrderDao orderDao ;
+    private final OrderDetailDao orderDetailDao ;
+    private final MenuItemDao menuItemDao ;
+    private final Scanner scanner ;
+
+    public OrderService(OrderDao orderDao, OrderDetailDao orderDetailDao, MenuItemDao menuItemDao) {
+        this.orderDao = orderDao;
+        this.orderDetailDao = orderDetailDao;
+        this.menuItemDao = menuItemDao;
+        this.scanner = new Scanner(System.in);
+    }
 
     public void placeOrder(int userId) {
+        List<OrderDetail> cart = new ArrayList<>();
+        double totalPrice = 0.0;
 
-        // TODO:
-        // Create order
+        System.out.println("\n--- 🛒 STARTING NEW ORDER ---");
+        System.out.println("Enter Menu ID to add to cart. Type '0' to finish and checkout.");
 
+
+        while (true){
+            List<MenuItem> menu = menuItemDao.findAll();
+            for (MenuItem item : menu) {
+                System.out.println(item.toString());
+            }
+
+            System.out.print("\nSelect Menu ID: ");
+            int selectedId;
+            try {
+                selectedId = Integer.parseInt(scanner.nextLine());
+            } catch (NumberFormatException e) {
+                System.out.println(" Invalid input. Please enter a number.");
+                continue;
+            }
+
+            if (selectedId == 0) break;
+
+            MenuItem item = menuItemDao.findById(selectedId);
+            if (item == null) {
+                System.out.println(" Invalid Menu ID! Try again.");
+                continue;
+            }
+
+            System.out.print("Enter quantity for " + item.getName() + ": ");
+            int qty;
+            try {
+                qty = Integer.parseInt(scanner.nextLine());
+                if (qty <= 0) throw new NumberFormatException();
+            } catch (NumberFormatException e) {
+                System.out.println(" Quantity must be a positive number.");
+                continue;
+            }
+
+            double subtotal = item.getPrice() * qty;
+            totalPrice += subtotal;
+            cart.add(new OrderDetail(0, 0, item.getId(), qty, item.getPrice()));
+            System.out.println(" Added to cart.");
+        }
+
+        if (cart.isEmpty()) {
+            System.out.println("🛒 Cart is empty. Order cancelled.");
+            return;
+        }
+
+        Order order = new Order(0, userId, LocalDateTime.now(), totalPrice);
+        int orderId = orderDao.save(order);
+
+        if (orderId != -1){
+            for (OrderDetail detail : cart){
+                detail.setOrderId(orderId);
+                orderDetailDao.save(detail);
+            }
+            System.out.println("\n Order placed successfully!");
+            printReceipt(orderId);
+        }else {
+            System.out.println(" Error occurred while saving the order.");
+        }
     }
 
     public void printReceipt(int orderId) {
+        List<OrderDetail> details = orderDetailDao.findByOrderId(orderId);
+        double grandTotal = 0.0;
 
-        // TODO:
-        // Print order receipt
+        System.out.println("\n=================================");
+        System.out.println("             RECEIPT");
+        System.out.println("=================================");
 
+
+        for (OrderDetail detail : details){
+            MenuItem item = menuItemDao.findById(detail.getMenuItemId());
+            if (item == null)   continue;
+
+            double subtotal = detail.getQuantity() * detail.getPrice();
+            grandTotal += subtotal;
+
+            System.out.printf("%-15s x%d  $%.2f%n", item.getName(), detail.getQuantity(), subtotal);
+        }
+        System.out.println("--------------------------------");
+        System.out.printf("GRAND TOTAL:        $%.2f%n", grandTotal);
+        System.out.println("================================\n");
     }
 
     public void showOrderHistory(int userId) {
+        List<Order> orders = orderDao.findByUserId(userId);
 
-        // TODO:
-        // Display user's order history
+        if (orders.isEmpty()){
+            System.out.println("No previous orders found.");
+            return;
+        }
 
+        System.out.println("\n==========  YOUR ORDER HISTORY ==========");
+        for (Order order : orders) {
+            System.out.printf("Order ID: %d | Date: %s | Total: $%.2f%n",
+                    order.getId(), order.getCreatedAt().toString(), order.getTotalPrice());
+        }
+        System.out.println("------------------------------");
     }
-
 }

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

@@ -1,32 +1,69 @@
 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 {
+    private final Scanner scanner;
+    private final AuthService authService;
+    private final MenuService menuService;
+    private final OrderService orderService;
 
-    private final Scanner scanner =
-            new Scanner(System.in);
+    public ConsoleMenu(AuthService authService, MenuService menuService, OrderService orderService) {
+        this.scanner = new Scanner(System.in);
+        this.authService = authService;
+        this.menuService = menuService;
+        this.orderService = orderService;
+    }
 
     public void start() {
 
         while (true) {
 
             System.out.println();
-            System.out.println("===== JAVA PIZZERIA =====");
+            System.out.println("===== \uD83C\uDF55 PIZZA RESTAURANT SYSTEM =====");
             System.out.println("1. Login");
             System.out.println("2. Register");
             System.out.println("3. Exit");
+            System.out.print("Select an option: ");
 
-            int choice = scanner.nextInt();
+            int choice = Integer.parseInt(scanner.nextLine());
 
             switch (choice) {
 
                 case 1:
-                    // TODO
+                    System.out.println("Username: ");
+                    String user = scanner.nextLine();
+                    System.out.println("Password: ");
+                    String pass = scanner.nextLine();
+
+                    User user1 = authService.login(user,pass);
+                    if (user1 != null){
+                        System.out.println("Welcome back");
+                        menuService.setCurrentUsers(user1);
+                        showMainMenu(user1);
+                    }else {
+                        System.out.println("Login failed");
+                    }
                     break;
 
                 case 2:
-                    // TODO
+                    System.out.println("New username: ");
+                    String user2 = scanner.nextLine();
+                    System.out.println("New password: ");
+                    String pass2 = scanner.nextLine();
+                    System.out.println("Email: ");
+                    String email = scanner.nextLine();
+
+                    if (authService.register(user2, pass2, email)){
+                        System.out.println("Registration successful");
+                    }else {
+                        System.out.println("Registration failed");
+                    }
                     break;
 
                 case 3:
@@ -40,5 +77,38 @@ public class ConsoleMenu {
         }
 
     }
+    private void showMainMenu(User authenticatedUser) {
+        while (true) {
+            System.out.println("\n===== MAIN MENU =====");
+            System.out.println("1. Show Menu");
+            System.out.println("2. Place Order");
+            System.out.println("3. Order History");
+            System.out.println("4. Logout");
+            System.out.print("Select an option: ");
 
+            int choice = Integer.parseInt(scanner.nextLine());
+
+            switch (choice) {
+                case 1:
+                    menuService.showMenuItems();
+                    break;
+
+                case 2:
+                    orderService.placeOrder(authenticatedUser.getId());
+                    break;
+
+                case 3:
+                    orderService.showOrderHistory(authenticatedUser.getId());
+                    break;
+
+                case 4:
+                    menuService.logout();
+                    System.out.println("Logged out");
+                    return;
+
+                default:
+                    System.out.println("Invalid choice");
+            }
+        }
+    }
 }