.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="c99a2d90-b53b-4858-a6ca-ed633fd94622">
+      <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/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="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="23" 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 +1,83 @@
--- 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.
+
+DROP TABLE IF EXISTS order_details CASCADE;
+DROP TABLE IF EXISTS orders CASCADE;
+DROP TABLE IF EXISTS menu_item CASCADE;
+DROP TABLE IF EXISTS users CASCADE;
 
 
-
--- =======================================================
--- 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 (
+                       uid 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_item (
+                           uid SERIAL PRIMARY KEY,
+                           name VARCHAR(50) NOT NULL,
+                           price DECIMAL(10, 2) NOT NULL CHECK (price > 0),
+                           category VARCHAR(50)
+);
 
 
+CREATE TABLE orders (
+                        uid SERIAL PRIMARY KEY,
+                        user_id INTEGER NOT NULL,
+                        order_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+                        total_price DECIMAL(10, 2) NOT NULL CHECK (total_price >= 0),
 
--- =======================================================
--- 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 ...
+                        CONSTRAINT fk_orders_user
+                            FOREIGN KEY (user_id)
+                                REFERENCES users(uid)
+                                ON DELETE CASCADE
+);
 
 
+CREATE TABLE order_details (
+                               uid SERIAL PRIMARY KEY,
+                               order_id INTEGER NOT NULL,
+                               item_id INTEGER NOT NULL,
+                               quantity INTEGER NOT NULL CHECK (quantity > 0),
+                               item_price DECIMAL(10, 2) NOT NULL CHECK (item_price >= 0),
 
--- =======================================================
--- 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 ...
+                               CONSTRAINT fk_order_details_order
+                                   FOREIGN KEY (order_id)
+                                       REFERENCES orders(uid)
+                                       ON DELETE CASCADE,
+
+                               CONSTRAINT fk_order_details_menu_item
+                                   FOREIGN KEY (item_id)
+                                       REFERENCES menu_item(uid)
+                                       ON DELETE RESTRICT
+);
 
 
-
--- =======================================================
--- INITIAL MENU DATA
--- =======================================================
---
--- Insert at least 3 food or drink items.
---
--- Example categories:
--- - Pizza
--- - Burger
--- - Pasta
--- - Drink
---
--- INSERT INTO ...
+INSERT INTO menu_item (name, price, category) VALUES
+                                                  ('French Fries', 1.00, 'Appetizer'),
+                                                  ('Chicken Burger', 4.05, 'Burger'),
+                                                  ('Pepperoni Pizza', 8.39, 'Pizza'),
+                                                  ('Milkshake', 2.20, 'Drink'),
+                                                  ('Ravioli', 9.00, 'Pasta');
 
 
-
--- =======================================================
--- 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
+                                                  ('saraz', '8d969eef6ecad3c29a3a629280e686cf0c3f5d5a86aff3ca12020c923adc6c92', 'sarrr@gmail.com'),
+                                                  ('kave02', '8d969eef6ecad3c29a3a629280e686cf0c3f5d5a86aff3ca12020c923adc6c92', 'kaviii02@gmail.com'),
+                                                  ('titami_t', '8d969eef6ecad3c29a3a629280e686cf0c3f5d5a86aff3ca12020c923adc6c92', 'titaza@gmil.com');
 
 
+INSERT INTO orders (user_id, order_date, total_price) VALUES
+                                                          (1, CURRENT_TIMESTAMP, 9.39),
+                                                          (2, CURRENT_TIMESTAMP, 13.05),
+                                                          (1, CURRENT_TIMESTAMP, 2.20),
+                                                          (3, CURRENT_TIMESTAMP, 8.39);
 
--- =======================================================
--- VERIFICATION QUERIES
--- =======================================================
---
--- Uncomment these queries to verify your database.
---
--- SELECT * FROM ...;
--- SELECT * FROM ...;
--- SELECT * FROM ...;
--- SELECT * FROM ...;
+
+INSERT INTO order_details (order_id, item_id, quantity, item_price) VALUES
+                                                                        (1, 1, 1, 1.00),
+                                                                        (1, 3, 1, 8.39),
+                                                                        (2, 2, 1, 4.05),
+                                                                        (2, 5, 1, 9.00),
+                                                                        (3, 4, 1, 2.20),
+                                                                        (4, 3, 1, 8.39);

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

@@ -1,25 +1,65 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
 import dev.model.MenuItem;
 
+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 MenuItemDao {
 
     public List<MenuItem> findAll() {
+        String query = "SELECT uid, name, price, category FROM menu_item ORDER BY uid";
+        List<MenuItem> items = new ArrayList<>();
 
-        // TODO:
-        // Retrieve all menu items
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement ps = conn.prepareStatement(query)) {
 
-        return null;
+            ResultSet rs = ps.executeQuery();
+
+            while (rs.next()) {
+                MenuItem item = new MenuItem();
+                item.setId(rs.getInt("uid"));
+                item.setName(rs.getString("name"));
+                item.setPrice(rs.getDouble("price"));
+                item.setCategory(rs.getString("category"));
+                items.add(item);
+            }
+
+            return items;
+
+        } catch (SQLException e) {
+            System.err.println("Error finding menu items: " + e.getMessage());
+            return new ArrayList<>();
+        }
     }
 
     public MenuItem findById(int id) {
+        String query = "SELECT uid, name, price, category FROM menu_item WHERE uid = ?";
 
-        // TODO:
-        // Find menu item by id
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement ps = conn.prepareStatement(query)) {
+
+            ps.setInt(1, id);
+            ResultSet rs = ps.executeQuery();
+
+            if (rs.next()) {
+                MenuItem item = new MenuItem();
+                item.setId(rs.getInt("uid"));
+                item.setName(rs.getString("name"));
+                item.setPrice(rs.getDouble("price"));
+                item.setCategory(rs.getString("category"));
+                return item;
+            }
+
+        } catch (SQLException e) {
+            System.err.println("Error finding menu item by ID: " + e.getMessage());
+        }
 
         return null;
     }
-
 }

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

@@ -1,25 +1,89 @@
 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 query = "INSERT INTO orders (user_id, order_date, total_price) VALUES (?, ?, ?)";
 
-        // TODO:
-        // Insert order and return generated id
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement ps = conn.prepareStatement(query, Statement.RETURN_GENERATED_KEYS)) {
+
+            ps.setInt(1, order.getUserId());
+            ps.setTimestamp(2, order.getCreatedAt());
+            ps.setDouble(3, order.getTotalPrice());
+
+            int rowsAffected = ps.executeUpdate();
+
+            if (rowsAffected == 1) {
+                ResultSet rs = ps.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) {
+        String query = "SELECT uid, user_id, order_date, total_price FROM orders WHERE user_id = ?";
+        List<Order> orders = new ArrayList<>();
 
-        // TODO:
-        // Retrieve all orders of a user
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement ps = conn.prepareStatement(query)) {
+
+            ps.setInt(1, userId);
+            ResultSet rs = ps.executeQuery();
+
+            while (rs.next()) {
+                Order order = new Order();
+                order.setId(rs.getInt("uid"));
+                order.setUserId(rs.getInt("user_id"));
+                order.setCreatedAt(rs.getTimestamp("order_date"));
+                order.setTotalPrice(rs.getDouble("total_price"));
+                orders.add(order);
+            }
+
+            return orders;
+
+        } catch (SQLException e) {
+            System.err.println("Error finding orders: " + e.getMessage());
+            return new ArrayList<>();
+        }
+    }
+
+    public Order findById(int orderId) {
+        String query = "SELECT uid, user_id, order_date, total_price FROM orders WHERE uid = ?";
+
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement ps = conn.prepareStatement(query)) {
+
+            ps.setInt(1, orderId);
+            ResultSet rs = ps.executeQuery();
+
+            if (rs.next()) {
+                Order order = new Order();
+                order.setId(rs.getInt("uid"));
+                order.setUserId(rs.getInt("user_id"));
+                order.setCreatedAt(rs.getTimestamp("order_date"));
+                order.setTotalPrice(rs.getDouble("total_price"));
+                return order;
+            }
+
+        } catch (SQLException e) {
+            System.err.println("Error finding order by ID: " + e.getMessage());
+        }
 
         return null;
     }
-
 }

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

@@ -1,24 +1,65 @@
 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 query = "INSERT INTO orders_detail (order_id, item_id, quantity, item_price) VALUES (?, ?, ?, ?)";
 
-        // TODO:
-        // Insert order detail
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement ps = conn.prepareStatement(query)) {
 
+            ps.setInt(1, detail.getOrderId());
+            ps.setInt(2, detail.getMenuItemId());
+            ps.setInt(3, detail.getQuantity());
+            ps.setDouble(4, detail.getPrice());
+
+            ps.executeUpdate();
+
+        } catch (SQLException e) {
+            System.err.println("Error saving order detail: " + e.getMessage());
+        }
     }
 
     public List<OrderDetail> findByOrderId(int orderId) {
+        String query = "SELECT od.uid, od.order_id, od.item_id, od.quantity, od.item_price, mi.name AS item_name " +
+                "FROM orders_detail od " +
+                "JOIN menu_item mi ON od.item_id = mi.uid " +
+                "WHERE od.order_id = ? " +
+                "ORDER BY od.uid";
 
-        // TODO:
-        // Retrieve order details
+        List<OrderDetail> details = new ArrayList<>();
 
-        return null;
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement ps = conn.prepareStatement(query)) {
+
+            ps.setInt(1, orderId);
+            ResultSet rs = ps.executeQuery();
+
+            while (rs.next()) {
+                OrderDetail detail = new OrderDetail();
+                detail.setId(rs.getInt("uid"));
+                detail.setOrderId(rs.getInt("order_id"));
+                detail.setMenuItemId(rs.getInt("item_id"));
+                detail.setQuantity(rs.getInt("quantity"));
+                detail.setPrice(rs.getDouble("item_price"));
+                details.add(detail);
             }
 
+            return details;
+
+        } catch (SQLException e) {
+            System.err.println("Error finding order details: " + e.getMessage());
+            return new ArrayList<>();
+        }
+    }
 }

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

@@ -1,23 +1,56 @@
 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) {
+        String query = "INSERT INTO users (username, password, email) VALUES (?, ?, ?)";
 
-        // TODO:
-        // Insert user into database
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement ps = conn.prepareStatement(query)) {
 
+            ps.setString(1, user.getUsername());
+            ps.setString(2, user.getPassword());
+            ps.setString(3, user.getEmail());
+
+            int rowsAffected = ps.executeUpdate();
+            return rowsAffected == 1;
+
+        } catch (SQLException e) {
+            System.err.println("Error saving user: " + e.getMessage());
             return false;
         }
+    }
 
     public User findByUsername(String username) {
+        String query = "SELECT uid, username, password, email FROM users WHERE username = ?";
 
-        // TODO:
-        // Find a user by username
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement ps = conn.prepareStatement(query)) {
+
+            ps.setString(1, username);
+            ResultSet rs = ps.executeQuery();
+
+            if (rs.next()) {
+                User user = new User();
+                user.setId(rs.getInt("uid"));
+                user.setUsername(rs.getString("username"));
+                user.setPassword(rs.getString("password"));
+                user.setEmail(rs.getString("email"));
+                return user;
+            }
+
+        } catch (SQLException e) {
+            System.err.println("Error finding user: " + e.getMessage());
+        }
 
         return null;
     }
-
 }

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

@@ -1,27 +1,23 @@
 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 URL = "jdbc:postgresql://localhost:5432/restaurant_db";
+    private static final String USER = "postgres";
+    private static final String PASSWORD = "1381sa";
 
-    private static final String USER = "postgres"; // Your Username
-
-    private static final String PASSWORD = "password"; // Your Password
-
-    private DatabaseConnection() {
+    private DatabaseConnection() {}
 
+    public static Connection getConnection() throws SQLException {
+        try {
+            Class.forName("org.postgresql.Driver");
+            return DriverManager.getConnection(URL, USER, PASSWORD);
+        } catch (ClassNotFoundException e) {
+            throw new SQLException("PostgreSQL Driver not found!", e);
         }
-
-    public static Connection getConnection()
-            throws SQLException {
-
-        // TODO:
-        // Return a valid PostgreSQL connection
-
-        return null;
     }
-
 }

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

@@ -3,13 +3,39 @@ package dev.model;
 public class MenuItem {
 
     private int id;
-
     private String name;
-
-    private String description;
-
     private double price;
-
     private String 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 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

@@ -1,15 +1,43 @@
 package dev.model;
 
-import java.time.LocalDateTime;
+import java.sql.Timestamp;
 
 public class Order {
 
     private int id;
-
     private int userId;
-
-    private LocalDateTime createdAt;
-
+    private Timestamp createdAt;
     private double 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 Timestamp getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(Timestamp 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 +3,57 @@ package dev.model;
 public class OrderDetail {
 
     private int id;
-
     private int orderId;
-
     private int menuItemId;
-
     private int quantity;
-
     private double price;
+    private String itemName;
 
+    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;
+    }
+
+    public String getItemName() {
+        return itemName;
+    }
+
+    public void setItemName(String itemName) {
+        this.itemName = itemName;
+    }
 }

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

@@ -3,11 +3,39 @@ package dev.model;
 public class User {
 
     private int id;
-
     private String username;
-
     private String password;
-
     private String 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 +1,104 @@
 package dev.service;
 
+import dev.dao.UserDao;
 import dev.model.User;
 
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
 public class AuthService {
 
     public boolean register(String username, String password, String email) {
-
-        // TODO:
-        // Validate and register user
-
+        if (username == null || username.trim().isEmpty()) {
+            System.out.println("Username cannot be empty");
+            return false;
+        }
+        if (password == null || password.trim().isEmpty()) {
+            System.out.println("Password cannot be empty");
             return false;
         }
 
+        try {
+            UserDao userDao = new UserDao();
+
+            User existingUser = userDao.findByUsername(username);
+            if (existingUser != null) {
+                System.out.println("Username '" + username + "' is already taken!");
+                return false;
+            }
+
+            String hashedPassword = hashPassword(password);
+
+            User user = new User();
+            user.setUsername(username);
+            user.setPassword(hashedPassword);
+            user.setEmail(email);
+
+            boolean saved = userDao.save(user);
+
+            if (saved) {
+                System.out.println("Registration successful! Welcome " + username + "!");
+            } else {
+                System.out.println("Registration failed. Please try again.");
+            }
+
+            return saved;
+
+        } catch (Exception e) {
+            System.err.println("Registration error: " + e.getMessage());
+            return false;
+        }
+    }
+
     public User login(String username, String password) {
-
-        // TODO:
-        // Authenticate user
-
+        if (username == null || username.trim().isEmpty()) {
+            System.out.println("Username cannot be empty");
+            return null;
+        }
+        if (password == null || password.trim().isEmpty()) {
+            System.out.println("Password cannot be empty");
             return null;
         }
 
+        try {
+            UserDao userDao = new UserDao();
+
+            User user = userDao.findByUsername(username);
+
+            if (user == null) {
+                System.out.println("User '" + username + "' not found!");
+                return null;
+            }
+
+            String hashedEnteredPassword = hashPassword(password);
+
+            if (hashedEnteredPassword.equals(user.getPassword())) {
+                System.out.println("Login successful! Welcome back " + username + "!");
+                return user;
+            } else {
+                System.out.println("Invalid password!");
+                return null;
+            }
+
+        } catch (Exception e) {
+            System.err.println("Login error: " + e.getMessage());
+            return null;
+        }
+    }
+
+    private String hashPassword(String password) {
+        try {
+            MessageDigest md = MessageDigest.getInstance("SHA-256");
+            byte[] hashBytes = md.digest(password.getBytes());
+
+            StringBuilder sb = new StringBuilder();
+            for (byte b : hashBytes) {
+                sb.append(String.format("%02x", b));
+            }
+            return sb.toString();
+        } catch (NoSuchAlgorithmException e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
 }

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

@@ -1,12 +1,52 @@
 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
+    private final MenuItemDao menuDao;
 
+    public MenuService() {
+        this.menuDao = new MenuItemDao();
     }
 
+    public void showMenu() {
+        List<MenuItem> items = menuDao.findAll();
+
+        if (items.isEmpty()) {
+            System.out.println("No menu items available!");
+            return;
+        }
+
+        System.out.println("\n        - Remy's Today Menu -\n");
+
+        String currentCategory = "";
+        for (MenuItem item : items) {
+            String category = item.getCategory() != null ? item.getCategory() : "Other";
+
+            if (!category.equals(currentCategory)) {
+                currentCategory = category;
+                System.out.println("\n[ " + currentCategory + " ]");
+                System.out.println("----------------------------------------");
+            }
+
+            System.out.printf("%d. %-25s $%.2f\n",
+                    item.getId(),
+                    item.getName(),
+                    item.getPrice()
+            );
+        }
+        System.out.println("----------------------------------------\n");
+    }
+
+    public List<MenuItem> getAllMenuItems() {
+        return menuDao.findAll();
+    }
+
+    public MenuItem getMenuItemById(int id) {
+        return menuDao.findById(id);
+    }
 }

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

@@ -1,26 +1,202 @@
 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.sql.Timestamp;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Scanner;
+
 public class OrderService {
+    private final MenuItemDao menuDao;
+    private final OrderDao orderDao;
+    private final OrderDetailDao detailDao;
+    private final Scanner scanner;
+
+    public OrderService() {
+        this.menuDao = new MenuItemDao();
+        this.orderDao = new OrderDao();
+        this.detailDao = new OrderDetailDao();
+        this.scanner = new Scanner(System.in);
+    }
 
     public void placeOrder(int userId) {
 
-        // TODO:
-        // Create order
+        System.out.println("                [Placing Order]");
 
+        List<MenuItem> menuItems = menuDao.findAll();
+        if (menuItems.isEmpty()) {
+            System.out.println("No menu items available!");
+            return;
+        }
+
+        MenuService menuService = new MenuService();
+        menuService.showMenu();
+
+        List<OrderDetail> orderDetails = new ArrayList<>();
+        double totalPrice = 0.0;
+
+        while (true) {
+            System.out.print("\nEnter item ID (or 0 to finish): ");
+            int itemId = scanner.nextInt();
+
+            if (itemId == 0) {
+                if (orderDetails.isEmpty()) {
+                    System.out.println("Cannot place empty order!");
+                    return;
+                }
+                break;
+            }
+
+            MenuItem selectedItem = null;
+            for (MenuItem item : menuItems) {
+                if (item.getId() == itemId) {
+                    selectedItem = item;
+                    break;
+                }
+            }
+
+            if (selectedItem == null) {
+                System.out.println("Invalid item ID! Please try again.");
+                continue;
+            }
+
+            System.out.print("Enter quantity: ");
+            int quantity = scanner.nextInt();
+
+            if (quantity <= 0) {
+                System.out.println("Quantity must be greater than 0!");
+                continue;
+            }
+
+            OrderDetail detail = new OrderDetail();
+            detail.setMenuItemId(selectedItem.getId());
+            detail.setQuantity(quantity);
+            detail.setPrice(selectedItem.getPrice());
+            detail.setItemName(selectedItem.getName());
+
+            orderDetails.add(detail);
+
+            double subtotal = selectedItem.getPrice() * quantity;
+            totalPrice += subtotal;
+
+            System.out.printf("Added %dx %s ($%.2f)\n",
+                    quantity, selectedItem.getName(), subtotal);
+        }
+
+        Order order = new Order();
+        order.setUserId(userId);
+        order.setCreatedAt(new Timestamp(System.currentTimeMillis()));
+        order.setTotalPrice(totalPrice);
+
+        int orderId = orderDao.save(order);
+        if (orderId == -1) {
+            System.out.println("Failed to save order!");
+            return;
+        }
+
+        for (OrderDetail detail : orderDetails) {
+            detail.setOrderId(orderId);
+            detailDao.save(detail);
+        }
+
+        System.out.println("\nOrder placed successfully! Order #" + orderId);
+        printReceipt(orderId);
     }
 
     public void printReceipt(int orderId) {
+        List<OrderDetail> details = detailDao.findByOrderId(orderId);
 
-        // TODO:
-        // Print order receipt
+        if (details.isEmpty()) {
+            System.out.println("Order not found or has no items!");
+            return;
+        }
 
+        Order order = orderDao.findById(orderId);
+        if (order == null) {
+            System.out.println("Order not found!");
+            return;
+        }
+
+        System.out.println("\n========================================");
+        System.out.println("           ORDER RECEIPT");
+        System.out.println("========================================");
+        System.out.println("Order #: " + orderId);
+        System.out.println("Date:   " + order.getCreatedAt());
+        System.out.println("----------------------------------------");
+        System.out.printf("%-5s %-20s %-10s %-10s %-10s\n",
+                "ID", "Item", "Qty", "Price", "Subtotal");
+        System.out.println("----------------------------------------");
+
+        double grandTotal = 0.0;
+        for (OrderDetail detail : details) {
+            double subtotal = detail.getPrice() * detail.getQuantity();
+            grandTotal += subtotal;
+
+            String itemName = detail.getItemName() != null ?
+                    detail.getItemName() : "Item #" + detail.getMenuItemId();
+
+            System.out.printf("%-5d %-20s %-10d $%-9.2f $%-9.2f\n",
+                    detail.getMenuItemId(),
+                    itemName,
+                    detail.getQuantity(),
+                    detail.getPrice(),
+                    subtotal
+            );
+        }
+
+        System.out.println("----------------------------------------");
+        System.out.printf("%-47s $%-9.2f\n", "GRAND TOTAL:", grandTotal);
+        System.out.println("========================================");
+        System.out.println("   Thank you for your order!");
+        System.out.println("========================================\n");
     }
 
     public void showOrderHistory(int userId) {
+        System.out.println("\n========================================");
+        System.out.println("       ORDER HISTORY");
+        System.out.println("========================================\n");
 
-        // TODO:
-        // Display user's order history
+        List<Order> orders = orderDao.findByUserId(userId);
 
+        if (orders.isEmpty()) {
+            System.out.println("No orders found.");
+            return;
         }
 
+        System.out.println("You have " + orders.size() + " order(s):\n");
+        System.out.printf("%-10s %-25s %-10s %-10s\n",
+                "Order #", "Date", "Items", "Total");
+        System.out.println("------------------------------------------------------------");
+
+        for (Order order : orders) {
+            List<OrderDetail> details = detailDao.findByOrderId(order.getId());
+
+            int itemCount = 0;
+            for (OrderDetail detail : details) {
+                itemCount += detail.getQuantity();
+            }
+
+            System.out.printf("%-10d %-25s %-10d $%-9.2f\n",
+                    order.getId(),
+                    order.getCreatedAt().toString().substring(0, 19),
+                    itemCount,
+                    order.getTotalPrice()
+            );
+        }
+
+        System.out.println("------------------------------------------------------------\n");
+
+        System.out.print("Enter order ID to view details (or 0 to return): ");
+        int orderId = scanner.nextInt();
+
+        if (orderId > 0) {
+            printReceipt(orderId);
+        }
+    }
 }

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

@@ -1,44 +1,130 @@
 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 =
-            new Scanner(System.in);
+    private final Scanner scanner = new Scanner(System.in);
+    private final AuthService authService;
+    private final MenuService menuService;
+    private final OrderService orderService;
+    private User currentUser;
+
+    public ConsoleMenu() {
+        this.authService = new AuthService();
+        this.menuService = new MenuService();
+        this.orderService = new OrderService();
+    }
 
     public void start() {
-
         while (true) {
+            if (currentUser == null) {
+                showAuthMenu();
+            } else {
+                showMainMenu();
+            }
+        }
+    }
 
+    private void showAuthMenu() {
         System.out.println();
-            System.out.println("===== JAVA PIZZERIA =====");
+        System.out.println("      ===== JAVA PIZZERIA =====");
         System.out.println("1. Login");
-            System.out.println("2. Register");
+        System.out.println("2. Register New Account");
         System.out.println("3. Exit");
+        System.out.print("Choose an option: ");
 
         int choice = scanner.nextInt();
+        scanner.nextLine();
 
         switch (choice) {
-
             case 1:
-                    // TODO
+                login();
                 break;
-
             case 2:
-                    // TODO
+                register();
                 break;
-
             case 3:
-                    return;
-
+                System.out.println("Goodbye!");
+                System.exit(0);
+                break;
             default:
-                    System.out.println("Invalid choice");
-
+                System.out.println("Invalid choice!");
+        }
     }
 
+    private void showMainMenu() {
+        System.out.println();
+        System.out.println("           MAIN MENU");
+        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(currentUser.getId());
+                break;
+            case 3:
+                orderService.showOrderHistory(currentUser.getId());
+                break;
+            case 4:
+                logout();
+                break;
+            default:
+                System.out.println("Invalid choice!");
+        }
     }
 
+    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) {
+            currentUser = 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();
+
+        if (email == null || email.trim().isEmpty()) {
+            email = null;
+        }
+
+        boolean success = authService.register(username, password, email);
+        if (success) {
+            System.out.println("Please login with your new account.");
+        }
+    }
+
+    private void logout() {
+        System.out.println("Goodbye, " + currentUser.getUsername() + "!");
+        currentUser = null;
+    }
 }