update multiple classes

.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 +1,17 @@
+<?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="f6d07e17-51cf-4ac6-b639-e1093cb323b7">
+      <driver-ref>postgresql</driver-ref>
+      <synchronize>true</synchronize>
+      <jdbc-driver>org.postgresql.Driver</jdbc-driver>
+      <jdbc-url>jdbc:postgresql://localhost:5432/postgres</jdbc-url>
+      <jdbc-additional-properties>
+        <property name="com.intellij.clouds.kubernetes.db.host.port" />
+        <property name="com.intellij.clouds.kubernetes.db.enabled" value="false" />
+        <property name="com.intellij.clouds.kubernetes.db.container.port" />
+      </jdbc-additional-properties>
+      <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://mirror-maven.runflare.com/maven2" />
+    </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" project-jdk-name="21" 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 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

database.sql

@@ -1,141 +1,46 @@
--- Restaurant Database Management System
+CREATE TABLE users (
---
+    id SERIAL PRIMARY KEY,
--- Instructions:
+    username VARCHAR(20) NOT NULL UNIQUE,
--- 1. Create all required tables.
+    password VARCHAR(20) NOT NULL,
--- 2. Design appropriate PRIMARY KEY and FOREIGN KEY relationships.
+    email VARCHAR(100) UNIQUE
--- 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 TABLE menu_items(
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(50) NOT NULL ,
+    description TEXT,
+    price NUMERIC(10, 2) NOT NULL CHECK ( price>0 ),
+    category VARCHAR(50)
+);
 
--- =======================================================
+CREATE TABLE orders(
--- USER TABLE
+    id SERIAL PRIMARY KEY,
--- =======================================================
+    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
---
+    created_at TIMESTAMP NOT NULL,
--- Represents customers using the system.
+    total_price NUMERIC(10, 2) NOT NULL CHECK (total_price >= 0)
---
+
--- 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 order_detail(
--- =======================================================
+    id SERIAL PRIMARY KEY,
--- MENU ITEM TABLE
+    order_id INTEGER NOT NULL REFERENCES orders(id) ON DELETE CASCADE,
--- =======================================================
+    menu_item_id INTEGER NOT NULL REFERENCES menu_items(id),
---
+    quantity INTEGER NOT NULL CHECK (quantity > 0),
--- Represents available food and drink items.
+    price NUMERIC(10, 2) NOT NULL CHECK (price > 0)
---
+);
--- 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 ...
 
 
+INSERT INTO menu_items (name, description, price, category)
+VALUES
+    ('Margherita Classica', 'Tomato sauce, fresh mozzarella, and basil on a crispy thin crust', 16.00, 'Pizza'),
+    ('Smoked BBQ Bacon Burger', 'Angus beef with cheddar, bacon, onion rings, and BBQ sauce on a brioche bun.', 14.50, 'Burger'),
+    ('Truffle Mushroom Fettuccine', 'Creamy fettuccine with mushrooms, Parmesan, and a touch of truffle oil.', 18.00, 'Pasta'),
+    ('Cola', 'Cold soft drink', 2.50, 'Drink');
 
--- =======================================================
--- ORDER TABLE
--- =======================================================
 --
--- Represents orders placed by customers.
+SELECT * FROM users;
---
+SELECT * FROM menu_items;
--- Required information:
+SELECT * FROM orders;
--- - Unique identifier
+SELECT * FROM order_detail;
--- - 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 ...
-
-
-
--- =======================================================
--- 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 ...
-
-
-
--- =======================================================
--- 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/dao/OrderDetailDao.java

@@ -1,24 +1,74 @@
 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_detail (order_id, menu_item_id, quantity, price) VALUES(?, ?, ?, ?)";
+
+        try(Connection connection = DatabaseConnection.getConnection();
+            PreparedStatement preparedStatement = connection.prepareStatement(sql)) {
+
+            preparedStatement.setInt(1, detail.getOrderId());
+            preparedStatement.setInt(2, detail.getMenuItemId());
+            preparedStatement.setInt(3, detail.getQuantity());
+            preparedStatement.setDouble(4, detail.getPrice());
+
+            preparedStatement.executeUpdate();
+
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+
     }
 
     public List<OrderDetail> findByOrderId(int orderId) {
 
-        // TODO:
         // Retrieve order details
 
-        return null;
+        String sql = "SELECT * FROM order_detail WHERE order_id=?";
+
+        List<OrderDetail> orderDetails = new ArrayList<>();
+
+        try(Connection connection = DatabaseConnection.getConnection();
+            PreparedStatement preparedStatement = connection.prepareStatement(sql)) {
+
+            preparedStatement.setInt(1, orderId);
+
+            ResultSet resultSet = preparedStatement.executeQuery();
+
+            while (resultSet.next()) {
+
+                OrderDetail orderDetail = new OrderDetail();
+
+                orderDetail.setId(resultSet.getInt("id"));
+                orderDetail.setOrderId(resultSet.getInt("order_id"));
+                orderDetail.setMenuItemId(resultSet.getInt("menu_item_id"));
+                orderDetail.setQuantity(resultSet.getInt("quantity"));
+                orderDetail.setPrice(resultSet.getDouble("price"));
+
+                orderDetails.add(orderDetail);
+            }
+
+
+
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+
+        return orderDetails;
     }
 
 }

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

@@ -1,23 +1,63 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
 import dev.model.User;
 
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
 public class UserDao {
 
     public boolean save(User user) {
 
-        // TODO:
         // Insert user into database
 
-        return false;
+        String sql = "INSERT INTO users (username, password, email) VALUES(?, ?, ?)";
+
+        try(Connection connection = DatabaseConnection.getConnection();
+            PreparedStatement preparedStatement = connection.prepareStatement(sql)) {
+
+            preparedStatement.setString(1, user.getUsername());
+            preparedStatement.setString(2, user.getPassword());
+            preparedStatement.setString(3, user.getEmail());
+
+            return preparedStatement.executeUpdate() > 0;
+
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
     }
 
     public User findByUsername(String username) {
 
-        // TODO:
         // Find a user by username
+        // Retrieve all orders of a user
+        String sql = "SELECT * FROM users WHERE username=?";
 
+        try (Connection connection = DatabaseConnection.getConnection();
+             PreparedStatement preparedStatement = connection.prepareStatement(sql)) {
+
+            preparedStatement.setString(1, username);
+
+            ResultSet resultSet = preparedStatement.executeQuery();
+
+            if (resultSet.next()) {
+
+                User user = new User();
+
+                user.setId(resultSet.getInt("id"));
+                user.setUsername(resultSet.getString("username"));
+                user.setPassword(resultSet.getString("password"));
+                user.setEmail(resultSet.getString("email"));
+
+                return user;
+            }
+
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
         return null;
     }
-
 }

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

@@ -1,15 +1,16 @@
 package dev.database;
 
-import java.sql.Connection;
+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 URL = "jdbc:postgresql://localhost:5432/postgres"; // DB Server
 
     private static final String USER = "postgres"; // Your Username
 
-    private static final String PASSWORD = "password"; // Your Password
+    private static final String PASSWORD = "1234"; // Your Password
 
     private DatabaseConnection() {
 
@@ -18,10 +19,8 @@ public class DatabaseConnection {
     public static Connection getConnection()
             throws SQLException {
 
-        // TODO:
         // Return a valid PostgreSQL connection
-
+        return DriverManager.getConnection(URL, USER, PASSWORD);
-        return null;
     }
 
 }

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

@@ -17,4 +17,10 @@ public class MenuItem {
     public void setDescription(String description) { this.description = description; }
     public void setPrice(double price) { this.price = price; }
     public void setCategory(String category) { this.category = category; }
+
+    public int getId() { return id; }
+    public String getName() { return  name; }
+    public String getDescription() { return description; }
+    public double getPrice() { return price; }
+    public String getCategory() { return category; }
 }

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

@@ -10,4 +10,15 @@ public class User {
 
     private String email;
 
+
+    public void setId(int id) { this.id = id; }
+    public void setUsername(String username) { this.username= username; }
+    public void setPassword(String password) { this.password = password; }
+    public void setEmail(String email) { this.email = email; }
+
+
+    public int getId() { return id; }
+    public String getUsername() { return username; }
+    public String getEmail() { return email; }
+    public String getPassword() { return password; }
 }

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

@@ -1,22 +1,39 @@
 package dev.service;
 
+import dev.dao.UserDao;
 import dev.model.User;
 
 public class AuthService {
 
+    UserDao userDao = new UserDao();
+
     public boolean register(String username, String password, String email) {
 
-        // TODO:
         // Validate and register user
+        if( username == null || username.isBlank() || password == null || password.isBlank())
+            return false;
 
+        if (userDao.findByUsername(username) == null) {
+
+            User user = new User();
+
+            user.setEmail(email);
+            user.setPassword(password);
+            user.setUsername(username);
+
+            return userDao.save(user);
+        }
         return false;
     }
 
     public User login(String username, String password) {
 
-        // TODO:
         // Authenticate user
+        User user = userDao.findByUsername(username);
 
+        if (user != null && user.getPassword().equals(password)) {
+            return user;
+        }
         return null;
     }
 

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

@@ -1,12 +1,25 @@
 package dev.service;
 
+import dev.dao.MenuItemDao;
+import dev.model.MenuItem;
+
+import java.util.List;
+
 public class MenuService {
 
     public void showMenu() {
 
-        // TODO:
         // Display menu items
+        MenuItemDao menuItemDao = new MenuItemDao();
 
+        List<MenuItem> items = menuItemDao.findAll();
+
+        for ( MenuItem menuItem : items) {
+
+            System.out.println(menuItem.getId() + ". " + menuItem.getName() +
+                    "   " + menuItem.getPrice() + "$ \n" +
+                    menuItem.getCategory() + " | " + menuItem.getDescription());
+            System.out.println();
+        }
     }
-
 }

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

@@ -1,25 +1,119 @@
 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.util.ArrayList;
+import java.util.List;
+import java.util.Scanner;
+
 public class OrderService {
 
+    MenuItemDao menuItemDao = new MenuItemDao();
+    OrderDetailDao orderDetailDao = new OrderDetailDao();
+    OrderDao orderDao = new OrderDao();
+
+    Scanner in = new Scanner(System.in);
+
     public void placeOrder(int userId) {
 
-        // TODO:
+        List<OrderDetail> details = new ArrayList<>();
-        // Create order
+        int totalPrice = 0;
 
+        // Create order
+        while (true) {
+            System.out.println("Enter the id of your order (-1 to exit) : ");
+            int id = in.nextInt();
+
+            if(id==-1) break;
+
+            MenuItem menuItem = menuItemDao.findById(id);
+
+            if(menuItem != null) {
+
+                System.out.println("Enter quantity: ");
+                int quantity = in.nextInt();
+
+                if(quantity<=0) {
+                    System.out.println("Quantity can't be negative");
+                    continue;
+                }
+
+                OrderDetail orderDetail = new OrderDetail();
+
+                orderDetail.setPrice(menuItem.getPrice());
+                orderDetail.setQuantity(quantity);
+                orderDetail.setMenuItemId(id);
+
+                details.add(orderDetail);
+                totalPrice += menuItem.getPrice()*quantity;
+
+                System.out.println(quantity+ " " + menuItem.getName() + "(s) got added to your order.");
+            }
+        }
+
+        if (totalPrice<=0) return;
+
+        Order order = new Order();
+        order.setTotalPrice(totalPrice);
+        order.setUserId(userId);
+        int orderId = orderDao.save(order);
+
+        if (orderId == -1) {
+            System.out.println("Order could not be saved");
+            return;
+        }
+
+        for(OrderDetail orderDetail : details) {
+            orderDetail.setOrderId(orderId);
+            orderDetailDao.save(orderDetail);
+        }
+
+        printReceipt(orderId);
     }
 
     public void printReceipt(int orderId) {
 
-        // TODO:
         // Print order receipt
+        List<OrderDetail> details = orderDetailDao.findByOrderId(orderId);
 
+        if (details.isEmpty()) return;
+
+        double totalPrice = 0;
+
+        System.out.println("\n============ RECEIPT ============");
+
+        for (OrderDetail detail : details) {
+
+            MenuItem item = menuItemDao.findById(detail.getMenuItemId());
+
+            double subtotal = detail.getPrice() * detail.getQuantity();
+            totalPrice += subtotal;
+
+            System.out.println( item.getName() + " | Quantity: " + detail.getQuantity() +
+                            " | Price: " + detail.getPrice() + "$ | Total: " + subtotal + "$");
+        }
+        System.out.println("==============================");
+        System.out.println("Final Total: $" + totalPrice);
     }
 
     public void showOrderHistory(int userId) {
 
-        // TODO:
         // Display user's order history
+        List<Order> orders = orderDao.findByUserId(userId);
+
+        if (orders.isEmpty()) return;
+
+        System.out.println("\n===== ORDER HISTORY =====");
+
+        for (Order order : orders) {
+            System.out.println( "Order #" + order.getId() + " | Date: " + order.getCreatedAt() +
+                            " | Total: " + order.getTotalPrice() + "$");
+        }
 
     }
 

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

@@ -1,12 +1,21 @@
 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 Scanner in =
             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() {
 
         while (true) {
@@ -17,16 +26,17 @@ public class ConsoleMenu {
             System.out.println("2. Register");
             System.out.println("3. Exit");
 
-            int choice = scanner.nextInt();
+            int choice = in.nextInt();
+            in.nextLine();
 
             switch (choice) {
 
                 case 1:
-                    // TODO
+                    login();
                     break;
 
                 case 2:
-                    // TODO
+                    register();
                     break;
 
                 case 3:
@@ -41,4 +51,78 @@ public class ConsoleMenu {
 
     }
 
+
+    public void login() {
+
+        System.out.println("Enter your username: ");
+        String username = in.nextLine();
+
+        System.out.println("Enter your password: ");
+        String password = in.nextLine();
+
+        User user = authService.login(username, password);
+
+        if(user != null) {
+            System.out.println("Welcome back, " + username);
+            showOptions(user);
+        }
+        else System.out.println("Wrong username or password.");
+
+    }
+
+
+    public void register() {
+
+        System.out.println("Enter your username: ");
+        String username = in.nextLine();
+
+        System.out.println("Enter password: ");
+        String password = in.nextLine();
+
+        System.out.println("Enter your email: ");
+        String email = in.nextLine();
+
+        if (authService.register(username, password, email)) {
+            System.out.println("Welcome!");
+        }
+        else System.out.println("Registration failed");
+    }
+
+    public void showOptions(User user) {
+
+        System.out.println("""
+                =======================================
+                          \uD83C\uDF7D️ MAIN MENU \uD83C\uDF7D️
+                =======================================""");
+
+
+
+        while (true) {
+
+            System.out.println("1. View Menu\n" +
+                    "2. Place a New Order\n" +
+                    "3. View Order History \n" +
+                    "4. Logout");
+
+            int choice = in.nextInt();
+
+            switch (choice) {
+
+                case 1:
+                    menuService.showMenu();
+                    break;
+
+                case 2:
+                    orderService.placeOrder(user.getId());
+                    break;
+
+                case 3:
+                    orderService.showOrderHistory(user.getId());
+                    break;
+
+                case 4:
+                    return;
+            }
+        }
+    }
 }