complete Restaurant Management System with PostgreSQL and JDBC

.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/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/inspectionProfiles/Project_Default.xml

@@ -0,0 +1,6 @@
+<component name="InspectionProjectProfileManager">
+  <profile version="1.0">
+    <option name="myName" value="Project Default" />
+    <inspection_tool class="SqlNoDataSourceInspection" enabled="false" level="WARNING" enabled_by_default="false" />
+  </profile>
+</component>

.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="Central Repository" />
+      <option name="url" value="https://maven.devneeds.ir/" />
+    </remote-repository>
+    <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>
+  </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="25" project-jdk-type="JavaSDK" />
+</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 +1,50 @@
--- 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 TABLE users (
+                       id          SERIAL PRIMARY KEY,
+                       username    VARCHAR(50) UNIQUE NOT NULL,
+                       password    VARCHAR(255) NOT NULL,   -- هش شده با SHA-256 + Base64
+                       email       VARCHAR(100)
+);
+
+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)
+);
+
+CREATE TABLE orders (
+                        id          SERIAL PRIMARY KEY,
+                        user_id     INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+                        created_at  TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+                        total_price DECIMAL(10,2) NOT NULL CHECK (total_price >= 0)
+);
+
+CREATE TABLE order_details (
+                               id            SERIAL PRIMARY KEY,
+                               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),
+                               price         DECIMAL(10,2) NOT NULL CHECK (price >= 0)   -- قیمت در زمان خرید
+);
+
+INSERT INTO menu_items (name, description, price, category) VALUES
+                                                                ('Pizza', 'Classic Margherita with mozzarella and basil', 10.00, 'Main'),
+                                                                ('Burger', 'Juicy beef burger with lettuce and cheese', 8.00, 'Main'),
+                                                                ('Pasta', 'Creamy Alfredo pasta with chicken', 12.00, 'Main'),
+                                                                ('Salad', 'Fresh garden salad with vinaigrette', 6.50, 'Appetizer'),
+                                                                ('Soda', 'Carbonated soft drink', 2.50, 'Beverage');
+
+INSERT INTO users (username, password, email) VALUES
+    ('john_doe', 'XohImNooBHFR0OVvjcYpJ3NgPQ1qq73WKhHvch0VQtg=', 'john@example.com');
+
+INSERT INTO orders (user_id, total_price) VALUES
+    ((SELECT id FROM users WHERE username = 'john_doe'), 18.00);
 
 
-
--- =======================================================
--- 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 ...
-
-
-
--- =======================================================
--- 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 ...
-
-
-
--- =======================================================
--- 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 ...
-
-
-
--- =======================================================
--- 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 ...;
+INSERT INTO order_details (order_id, menu_item_id, quantity, price)
+VALUES
+    ((SELECT id FROM orders WHERE user_id = (SELECT id FROM users WHERE username = 'john_doe') ORDER BY id LIMIT 1),
+    (SELECT id FROM menu_items WHERE name = 'Pizza'), 2, 10.00),
+    ((SELECT id FROM orders WHERE user_id = (SELECT id FROM users WHERE username = 'john_doe') ORDER BY id LIMIT 1),
+     (SELECT id FROM menu_items WHERE name = 'Burger'), 1, 8.00);

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

@@ -4,22 +4,57 @@ import dev.model.MenuItem;
 
 import java.util.List;
 
+import dev.database.DatabaseConnection;
+
+import java.sql.*;
+import java.util.ArrayList;
+
 public class MenuItemDao {
 
     public List<MenuItem> findAll() {
+        List<MenuItem> items = new ArrayList<>();
+        String sql = "SELECT * FROM menu_items ORDER BY id";
+        try (Connection conn = DatabaseConnection.getConnection();
+             Statement stmt = conn.createStatement();
+             ResultSet rs = stmt.executeQuery(sql)) {
 
-        // TODO:
-        // Retrieve all menu items
-
-        return null;
+            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 conn = DatabaseConnection.getConnection();
+             PreparedStatement pstmt = conn.prepareStatement(sql)) {
 
-        // TODO:
-        // Find menu item by id
-
+            pstmt.setInt(1, id);
+            try (ResultSet rs = pstmt.executeQuery()) {
+                if (rs.next()) {
+                    MenuItem item = new MenuItem();
+                    item.setId(rs.getInt("id"));
+                    item.setName(rs.getString("name"));
+                    item.setDescription(rs.getString("description"));
+                    item.setPrice(rs.getDouble("price"));
+                    item.setCategory(rs.getString("category"));
+                    return item;
+                }
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
         return null;
+
     }
 
 }

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

@@ -4,21 +4,81 @@ import dev.model.Order;
 
 import java.util.List;
 
+import dev.database.DatabaseConnection;
+
+import java.sql.*;
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+
 public class OrderDao {
 
     public int save(Order order) {
+        String sql = "INSERT INTO orders (user_id, created_at, total_price) VALUES (?, ?, ?)";
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement pstmt = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS)) {
 
-        // TODO:
-        // Insert order and return generated id
+            pstmt.setInt(1, order.getUserId());
+            pstmt.setTimestamp(2, Timestamp.valueOf(order.getCreatedAt()));
+            pstmt.setDouble(3, order.getTotalPrice());
 
+            int affectedRows = pstmt.executeUpdate();
+            if (affectedRows > 0) {
+                try (ResultSet generatedKeys = pstmt.getGeneratedKeys()) {
+                    if (generatedKeys.next()) {
+                        int id = generatedKeys.getInt(1);
+                        order.setId(id);
+                        return id;
+                    }
+                }
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
         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";
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement pstmt = conn.prepareStatement(sql)) {
 
-        // TODO:
-        // Retrieve all orders of a user
+            pstmt.setInt(1, userId);
+            try (ResultSet rs = pstmt.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;
+    }
 
+    public Order findById(int orderId) {
+        String sql = "SELECT * FROM orders WHERE id = ?";
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement pstmt = conn.prepareStatement(sql)) {
+
+            pstmt.setInt(1, orderId);
+            try (ResultSet rs = pstmt.executeQuery()) {
+                if (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"));
+                    return order;
+                }
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
         return null;
     }
 

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

@@ -1,24 +1,59 @@
 package dev.dao;
 
 import dev.model.OrderDetail;
+import dev.database.DatabaseConnection;
+
+import java.sql.*;
+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, price) VALUES (?, ?, ?, ?)";
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement pstmt = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS)) {
 
-        // TODO:
-        // Insert order detail
+            pstmt.setInt(1, detail.getOrderId());
+            pstmt.setInt(2, detail.getMenuItemId());
+            pstmt.setInt(3, detail.getQuantity());
+            pstmt.setDouble(4, detail.getPrice());
+
+            pstmt.executeUpdate();
+            try (ResultSet generatedKeys = pstmt.getGeneratedKeys()) {
+                if (generatedKeys.next()) {
+                    detail.setId(generatedKeys.getInt(1));
+                }
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
 
     }
 
     public List<OrderDetail> findByOrderId(int orderId) {
+        List<OrderDetail> details = new ArrayList<>();
+        String sql = "SELECT * FROM order_details WHERE order_id = ?";
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement pstmt = conn.prepareStatement(sql)) {
 
-        // TODO:
-        // Retrieve order details
-
-        return null;
+            pstmt.setInt(1, orderId);
+            try (ResultSet rs = pstmt.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 +1,70 @@
 package dev.dao;
 
 import dev.model.User;
+import dev.database.DatabaseConnection;
+
+import java.sql.*;
+import java.util.Base64;
 
 public class UserDao {
 
     public boolean save(User user) {
+        String sql = "INSERT INTO users (username, password, email) VALUES (?, ?, ?)";
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement pstmt = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS)) {
 
-        // TODO:
-        // Insert user into database
 
-        return false;
+            String hashedPassword = hashPassword(user.getPassword());
+            pstmt.setString(1, user.getUsername());
+            pstmt.setString(2, hashedPassword);
+            pstmt.setString(3, user.getEmail());
+
+            int affectedRows = pstmt.executeUpdate();
+            if (affectedRows > 0) {
+                try (ResultSet generatedKeys = pstmt.getGeneratedKeys()) {
+                    if (generatedKeys.next()) {
+                        user.setId(generatedKeys.getInt(1));
+                    }
+                }
+                return true;
+            }
+            return false;
+        } catch (SQLException e) {
+            e.printStackTrace();
+            return false;
+        }
     }
 
     public User findByUsername(String username) {
+        String sql = "SELECT * FROM users WHERE username = ?";
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement pstmt = conn.prepareStatement(sql)) {
 
-        // TODO:
-        // Find a user by username
-
+            pstmt.setString(1, username);
+            try (ResultSet rs = pstmt.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;
     }
 
+    private String hashPassword(String password) {
+        try {
+            java.security.MessageDigest md = java.security.MessageDigest.getInstance("SHA-256");
+            byte[] hash = md.digest(password.getBytes(java.nio.charset.StandardCharsets.UTF_8));
+            return Base64.getEncoder().encodeToString(hash);
+        } catch (java.security.NoSuchAlgorithmException e) {
+            throw new RuntimeException("Hashing algorithm not found", e);
+        }
+    }
+
 }

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

@@ -1,15 +1,16 @@
 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 USER = "navid299";
 
-    private static final String PASSWORD = "password"; // Your Password
+    private static final String PASSWORD = "7777";
 
     private 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 +12,53 @@ public class MenuItem {
 
     private String category;
 
+    public MenuItem() {}
+
+    public MenuItem(String name, String description, double price, String category) {
+        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;
+    }
+
 }

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

@@ -12,4 +12,44 @@ public class Order {
 
     private double totalPrice;
 
+    public Order() {}
+
+    public Order(int userId, LocalDateTime createdAt, double totalPrice) {
+        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

@@ -12,4 +12,53 @@ public class OrderDetail {
 
     private double price;
 
+    public OrderDetail() {}
+
+    public OrderDetail(int orderId, int menuItemId, int quantity, double price) {
+        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

@@ -2,12 +2,53 @@ package dev.model;
 
 public class User {
 
+    public User() {}
+
+    public User(String username, String password, String email) {
+        this.username = username;
+        this.password = password;
+        this.email = email;
+    }
+
     private int id;
 
+    public int getId() {
+        return id;
+    }
+    public void setId(int id) {
+        this.id = id;
+    }
+
     private String username;
 
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
     private String password;
 
+
+    public String getPassword() {
+        return password;
+    }
+
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
     private String email;
 
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
 }

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

@@ -1,23 +1,52 @@
 package dev.service;
 
 import dev.model.User;
+import dev.dao.UserDao;
+import java.util.Base64;
 
 public class AuthService {
+    private UserDao userDao = new UserDao();
 
     public boolean register(String username, String password, String email) {
+        if (username == null || username.trim().isEmpty() || password == null || password.trim().isEmpty()) {
+            System.out.println("Username and password are required.");
+            return false;
+        }
 
-        // TODO:
-        // Validate and register user
+        User existing = userDao.findByUsername(username);
+        if (existing != null) {
+            System.out.println("Username already exists.");
+            return false;
+        }
 
-        return false;
+        User user = new User(username, password, email);
+        return userDao.save(user);
     }
 
     public User login(String username, String password) {
+        User user = userDao.findByUsername(username);
+        if (user == null) {
+            System.out.println("Invalid username or password.");
+            return null;
+        }
 
-        // TODO:
-        // Authenticate user
-
-        return null;
+        String hashedInput = hashPassword(password);
+        if (hashedInput.equals(user.getPassword())) {
+            System.out.println("Login successful! Welcome, " + username);
+            return user;
+        } else {
+            System.out.println("Invalid username or password.");
+            return null;
+        }
+    }
+    private String hashPassword(String password) {
+        try {
+            java.security.MessageDigest md = java.security.MessageDigest.getInstance("SHA-256");
+            byte[] hash = md.digest(password.getBytes(java.nio.charset.StandardCharsets.UTF_8));
+            return Base64.getEncoder().encodeToString(hash);
+        } catch (java.security.NoSuchAlgorithmException e) {
+            throw new RuntimeException("Hashing algorithm not found", e);
+        }
     }
 
 }

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 {
-
+    private MenuItemDao menuItemDao = new MenuItemDao();
     public void showMenu() {
+        List<MenuItem> items = menuItemDao.findAll();
+        if (items.isEmpty()) {
+            System.out.println("No menu items available.");
+            return;
+        }
+        System.out.println("\n--- Menu ---");
+        System.out.printf("%-4s %-25s %-10s %s\n", "ID", "Name", "Price", "Category");
+        System.out.println("------------------------------------------------");
+        for (MenuItem item : items) {
+            System.out.printf("%-4d %-25s $%-9.2f %s\n",
+                    item.getId(), item.getName(), item.getPrice(), item.getCategory());
+        }
+    }
 
-        // TODO:
-        // Display menu items
-
+    public MenuItem getMenuItemById(int id) {
+        return menuItemDao.findById(id);
     }
 
 }

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

@@ -1,26 +1,136 @@
 package dev.service;
 
+import dev.dao.OrderDao;
+import dev.dao.OrderDetailDao;
+import dev.dao.MenuItemDao;
+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 OrderDao orderDao = new OrderDao();
+    private OrderDetailDao orderDetailDao = new OrderDetailDao();
+    private MenuItemDao menuItemDao = new MenuItemDao();
+    private MenuService menuService = new MenuService();
 
     public void placeOrder(int userId) {
 
-        // TODO:
-        // Create order
+        Scanner scanner = new Scanner(System.in);
+        List<OrderDetail> cart = new ArrayList<>();
+        double total = 0.0;
+
+        System.out.println("\n[Placing Order]");
+        while (true) {
+            menuService.showMenu();
+            System.out.print("Enter the ID of the item to add (or 0 to finish): ");
+            int itemId = scanner.nextInt();
+            if (itemId == 0) break;
+
+            MenuItem item = menuItemDao.findById(itemId);
+            if (item == null) {
+                System.out.println("Invalid item ID. Try again.");
+                continue;
+            }
+
+            System.out.print("Enter quantity: ");
+            int qty = scanner.nextInt();
+            if (qty <= 0) {
+                System.out.println("Quantity must be greater than zero.");
+                continue;
+            }
+
+            double subtotal = item.getPrice() * qty;
+            OrderDetail detail = new OrderDetail();
+            detail.setMenuItemId(itemId);
+            detail.setQuantity(qty);
+            detail.setPrice(item.getPrice());
+            cart.add(detail);
+
+            total += subtotal;
+            System.out.printf("Added %dx %s to your cart.\n", qty, item.getName());
+        }
+
+        if (cart.isEmpty()) {
+            System.out.println("No items selected. Order cancelled.");
+            return;
+        }
+
+
+        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 (OrderDetail detail : cart) {
+            detail.setOrderId(orderId);
+            orderDetailDao.save(detail);
+        }
+
+        System.out.println("Order saved successfully!");
+        printReceipt(orderId);
 
     }
 
     public void printReceipt(int orderId) {
+        Order order = orderDao.findById(orderId);
+        if (order == null) {
+            System.out.println("Order not found.");
+            return;
+        }
 
-        // TODO:
-        // Print order receipt
+        List<OrderDetail> details = orderDetailDao.findByOrderId(orderId);
+        if (details.isEmpty()) {
+            System.out.println("No details found for this order.");
+            return;
+        }
+
+        System.out.println("\n[Order Summary / Receipt]");
+        System.out.println("Order ID: " + orderId);
+        System.out.println("Date: " + order.getCreatedAt());
+        System.out.println("---------------------------------------");
+        System.out.printf("%-20s %-5s %-10s %-10s\n", "Item", "Qty", "Unit", "Total");
+        System.out.println("---------------------------------------");
+
+        double grandTotal = 0.0;
+        for (OrderDetail detail : details) {
+            MenuItem item = menuItemDao.findById(detail.getMenuItemId());
+            String itemName = (item != null) ? item.getName() : "Unknown";
+            double lineTotal = detail.getPrice() * detail.getQuantity();
+            System.out.printf("%-20s %-5d $%-9.2f $%-9.2f\n",
+                    itemName, detail.getQuantity(), detail.getPrice(), lineTotal);
+            grandTotal += lineTotal;
+        }
+        System.out.println("---------------------------------------");
+        System.out.printf("Final Total: $%.2f\n", grandTotal);
 
     }
 
     public void showOrderHistory(int userId) {
+        List<Order> orders = orderDao.findByUserId(userId);
+        if (orders.isEmpty()) {
+            System.out.println("No orders found for this user.");
+            return;
+        }
 
-        // TODO:
-        // Display user's order history
-
+        System.out.println("\n[Order History]");
+        System.out.printf("%-8s %-20s %-12s\n", "Order ID", "Date", "Total");
+        System.out.println("--------------------------------------");
+        for (Order order : orders) {
+            System.out.printf("%-8d %-20s $%-10.2f\n",
+                    order.getId(), order.getCreatedAt().toString(), order.getTotalPrice());
+        }
     }
 
 }

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

@@ -1,44 +1,121 @@
 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 AuthService authService = new AuthService();
+    private MenuService menuService = new MenuService();
+    private OrderService orderService = new OrderService();
+    private User loggedInUser = null;
     private final Scanner scanner =
             new Scanner(System.in);
 
     public void start() {
 
         while (true) {
+            if (loggedInUser == null) {
 
-            System.out.println();
-            System.out.println("===== JAVA PIZZERIA =====");
-            System.out.println("1. Login");
-            System.out.println("2. Register");
-            System.out.println("3. Exit");
+                System.out.println();
+                System.out.println("===== JAVA PIZZERIA =====");
+                System.out.println("1. Login");
+                System.out.println("2. Register");
+                System.out.println("3. Exit");
 
-            int choice = scanner.nextInt();
+                int choice = scanner.nextInt();
+                scanner.nextLine();
 
-            switch (choice) {
+                switch (choice) {
 
-                case 1:
-                    // TODO
-                    break;
+                    case 1:
+                        login();
+                        break;
 
-                case 2:
-                    // TODO
-                    break;
+                    case 2:
+                        register();
+                        break;
 
-                case 3:
-                    return;
+                    case 3:
+                        System.out.println("Goodbye!");
+                        return;
 
-                default:
-                    System.out.println("Invalid choice");
+                    default:
+                        System.out.println("Invalid choice");
 
+                }
+            }else{
+                showMainMenu();
             }
 
         }
 
     }
+    private void login() {
+        System.out.println("\n[Login]");
+        System.out.print("Enter username: ");
+        String username = scanner.nextLine();
+        System.out.print("Enter password: ");
+        String password = scanner.nextLine();
+
+        User user = authService.login(username, password);
+        if (user != null) {
+            loggedInUser = user;
+        }
+    }
+
+    private void register() {
+        System.out.println("\n[Register]");
+        System.out.print("Enter username: ");
+        String username = scanner.nextLine();
+        System.out.print("Enter password: ");
+        String password = scanner.nextLine();
+        System.out.print("Enter email (optional): ");
+        String email = scanner.nextLine();
+
+        boolean success = authService.register(username, password, email);
+        if (success) {
+            System.out.println("Registration successful! You can now login.");
+        } else {
+            System.out.println("Registration failed.");
+        }
+    }
+
+    private void showMainMenu() {
+        System.out.println();
+        System.out.println("=======================================");
+        System.out.println("          🍽️ MAIN MENU 🍽️");
+        System.out.println("=======================================");
+        System.out.println("1. View Menu");
+        System.out.println("2. Place a 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:
+                orderService.placeOrder(loggedInUser.getId());
+                break;
+            case 3:
+                orderService.showOrderHistory(loggedInUser.getId());
+                break;
+            case 4:
+                loggedInUser = null;
+                System.out.println("Logged out.");
+                break;
+            default:
+                System.out.println("Invalid choice.");
+        }
+    }
 
 }