.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="restaurant_db" uuid="58cfe2c8-dec0-4953-b2b5-821b6e7313f9">
+      <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://maven.myket.ir/" />
+    </remote-repository>
+  </component>
+</project>

.idea/misc.xml

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

.idea/sqldialects.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="SqlDialectMappings">
+    <file url="file://$PROJECT_DIR$/database.sql" dialect="PostgreSQL" />
+  </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 +1,81 @@
--- Restaurant Database Management System
---
--- Instructions:
--- 1. Create all required tables.
--- 2. Design appropriate PRIMARY KEY and FOREIGN KEY relationships.
--- 3. Add suitable constraints based on the requirements.
--- 4. Insert initial mock data.
--- 5. Insert at least 3 menu items.
--- 6. The script should be executable from start to finish without errors.
-
-
-
 -- =======================================================
 -- USER TABLE
 -- =======================================================
---
+CREATE TABLE users(
--- Represents customers using the system.
+    id              SERIAL          PRIMARY KEY,
---
+    username        VARCHAR(50)     UNIQUE NOT NULL,
--- Required information:
+    password_hash   TEXT            NOT NULL,
--- - Unique identifier
+    email           VARCHAR(255)    UNIQUE
--- - 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
 -- =======================================================
---
+CREATE TABLE menu(
--- Represents available food and drink items.
+    id              SERIAL          PRIMARY KEY,
---
+    name            VARCHAR(250)    NOT NULL,
--- Required information:
+    description     TEXT,
--- - Unique identifier
+    price           NUMERIC         NOT NULL CHECK (price > 0),
--- - Name
+    category        VARCHAR(50)
--- - 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
 -- =======================================================
---
+CREATE TABLE orders(
--- Represents orders placed by customers.
+    id          SERIAL      PRIMARY KEY,
---
+    user_id     INT         NOT NULL,
--- Required information:
+    created_at  TIMESTAMP   NOT NULL ,
--- - Unique identifier
+    total_price NUMERIC     NOT NULL,
--- - 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 ...
 
+    FOREIGN KEY (user_id) REFERENCES users(id)
+);
 
 
 -- =======================================================
 -- ORDER DETAIL TABLE
 -- =======================================================
---
+CREATE TABLE order_details(
--- Represents items inside an order.
+    id          SERIAL  PRIMARY KEY ,
---
+    order_id    INT     NOT NULL ,
--- Required information:
+    menu_id     INT     NOT NULL ,
--- - Unique identifier
+    quantity    NUMERIC NOT NULL        CHECK (quantity > 0),
--- - Reference to an order
+    item_price  NUMERIC NOT NULL,
--- - 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 ...
 
+    FOREIGN KEY (order_id) REFERENCES orders(id),
+    FOREIGN KEY (menu_id) REFERENCES menu(id)
+);
 
 
 -- =======================================================
 -- INITIAL MENU DATA
 -- =======================================================
---
+-- id is left out because it has SERIAl type and auto-generates.
--- Insert at least 3 food or drink items.
+INSERT INTO menu (name, description, price, category) VALUES
---
+    ('Margherita Pizza',      'Classic tomato, mozzarella, and basil',        9.99,  'Pizza'),
--- Example categories:
+    ('Grilled Chicken Wrap',  'Chicken, lettuce, tomato, garlic sauce',       7.49,  'Wraps'),
--- - Pizza
+    ('Caesar Salad',          'Romaine, parmesan, croutons, caesar dressing', 6.99,  'Salads'),
--- - Burger
+    ('Beef Burger',           'Beef patty, cheddar, lettuce, brioche bun',    8.99,  'Burgers'),
--- - Pasta
+    ('Spaghetti Carbonara',   'Pasta, egg, pancetta, parmesan',              10.49,  'Pasta'),
--- - Drink
+    ('Veggie Spring Rolls',   'Crispy rolls with mixed vegetables',           5.49,  'Appetizers'),
---
+    ('Chocolate Lava Cake',   'Warm cake with molten chocolate center',       4.99,  'Dessert'),
--- INSERT INTO ...
+    ('Iced Latte',            'Espresso with cold milk over ice',             3.49,  'Beverages'),
-
+    ('Mushroom Risotto',      'Creamy arborio rice with wild mushrooms',      9.49,  'Pasta'),
+    ('Fish Tacos',            'Grilled fish, cabbage slaw, chipotle mayo',    8.49,  'Tacos');
 
 
 -- =======================================================
 -- OPTIONAL TEST DATA
 -- =======================================================
---
--- You may insert sample users and orders for testing.
--- This section is optional.
---
--- INSERT INTO ...
 
 
 
 -- =======================================================
 -- VERIFICATION QUERIES
 -- =======================================================
---
+-- SELECT * FROM users;
--- Uncomment these queries to verify your database.
+-- SELECT * FROM menu;
---
+-- SELECT * FROM orders;
--- SELECT * FROM ...;
+-- SELECT * FROM order_details;
--- SELECT * FROM ...;
--- SELECT * FROM ...;
--- SELECT * FROM ...;

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

@@ -1,25 +1,73 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
 import dev.model.MenuItem;
 
+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() {
 
-        // TODO:
+        String sql = "SELECT * FROM menu";
-        // Retrieve all menu items
+        List<MenuItem> result = new ArrayList<>();
 
-        return null;
+        try{
+
+            PreparedStatement st = DatabaseConnection.getConnection().prepareStatement(sql);
+            ResultSet rs = st.executeQuery();
+            while(rs.next()){
+                result.add(new MenuItem(
+                        rs.getInt("id"),
+                        rs.getString("name"),
+                        rs.getString("description"),
+                        rs.getDouble("price"),
+                        rs.getString("category")
+                ));
+            }
+
+            st.close();
+
+        } catch (SQLException e) {
+            System.err.println("Failed to fetch menu " + e.getMessage());
+        }
+
+        return result;
     }
 
     public MenuItem findById(int id) {
 
-        // TODO:
+        String sql = "SELECT * FROM menu WHERE id=?";
-        // Find menu item by id
+        MenuItem itemMenu = null;
+
+        try{
+
+            PreparedStatement st = DatabaseConnection.getConnection().prepareStatement(sql);
+            st.setInt(1, id);
+            ResultSet rs = st.executeQuery();
+
+            if(rs.next()){
+                itemMenu = new MenuItem(
+                        rs.getInt("id"),
+                        rs.getString("name"),
+                        rs.getString("description"),
+                        rs.getDouble("price"),
+                        rs.getString("category")
+                );
+            }
+
+            st.close();
+
+        } catch (SQLException e) {
+            System.err.println("Failed to fetch item " + e.getMessage());
+        }
+
+        return itemMenu;
 
-        return null;
     }
 
 }

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

@@ -1,25 +1,73 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
 import dev.model.Order;
 
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Timestamp;
+import java.util.ArrayList;
 import java.util.List;
 
 public class OrderDao {
 
     public int save(Order order) {
 
-        // TODO:
+        String sql = "INSERT INTO orders(user_id, created_at, total_price) VALUES(?, ?, ?)";
-        // Insert order and return generated id
+
+        try{
+
+            PreparedStatement st = DatabaseConnection.getConnection().prepareStatement(sql);
+            st.setInt(1, order.getUserId());
+            st.setTimestamp(2, Timestamp.valueOf(order.getCreatedAt()));
+            st.setDouble(3, order.getTotalPrice());
+
+            st.executeUpdate();
+            ResultSet rsKeys = st.getGeneratedKeys();
+            if(rsKeys.next()){
+                int orderId = rsKeys.getInt(1);
+                order.setId(orderId);
+                return orderId;
+            }
+
+            st.close();
+
+        } catch (SQLException e) {
+            System.err.println("Failed to add order " + e.getMessage());
+        }
 
         return -1;
     }
 
     public List<Order> findByUserId(int userId) {
 
-        // TODO:
+        String sql = "SELECT * FROM orders WHERE user_id=?";
-        // Retrieve all orders of a user
+        List<Order> result = new ArrayList<>();
+
+        try {
+
+            PreparedStatement st = DatabaseConnection.getConnection().prepareStatement(sql);
+            st.setInt(1,userId);
+
+            ResultSet rs = st.executeQuery();
+            while (rs.next()){
+                result.add(new Order(
+                        rs.getInt("id"),
+                        rs.getInt("user_id"),
+                        rs.getTimestamp("created_at").toLocalDateTime(),
+                        rs.getInt("total_price")
+                ));
+            }
+
+            st.close();
+
+        } catch (SQLException e) {
+            System.err.println("Unable to find user: " + e.getMessage());
+        }
+
+        return result;
 
-        return null;
     }
 
 }

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

@@ -1,24 +1,66 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
 import dev.model.OrderDetail;
 
+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:
+        String sql = "INSERT INTO order_details (order_id, menu_id, quantity, item_price) VALUES (?,?,?,?)";
-        // Insert order detail
+
+        try {
+            PreparedStatement st = DatabaseConnection.getConnection().prepareStatement(sql);
+            st.setInt(1, detail.getOrderId());
+            st.setInt(2, detail.getMenuItemId());
+            st.setInt(3, detail.getQuantity());
+            st.setDouble(4, detail.getPrice());
+            st.executeUpdate();
+
+            st.close();
+        } catch (SQLException e) {
+            System.err.println("Error writing order details: " + e.getMessage());
+        }
 
     }
 
     public List<OrderDetail> findByOrderId(int orderId) {
 
-        // TODO:
+        List<OrderDetail> result = new ArrayList<>();
-        // Retrieve order details
+
+        String sql = "SELECT * FROM order_details WHERE order_id=?";
+
+        try {
+
+            PreparedStatement st = DatabaseConnection.getConnection().prepareStatement(sql);
+            st.setInt(1,orderId);
+
+            ResultSet rs = st.executeQuery();
+            while (rs.next()){
+                result.add(new OrderDetail(
+                                rs.getInt("id"),
+                                rs.getInt("order_id"),
+                                rs.getInt("menu_id"),
+                                rs.getInt("quantity"),
+                                rs.getDouble("item_price")
+                        )
+                );
+            }
+
+            st.close();
+
+        } catch (SQLException e) {
+            System.err.println("Error retrieving order details: " + e.getMessage());
+        }
+
+        return result;
         
-        return null;
     }
 
 }

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.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
 public class UserDao {
 
     public boolean save(User user) {
 
-        // TODO:
+        String sql = "INSERT INTO users (username, password_hash, email) VALUES (?, ?, ?)";
-        // Insert user into database
+
+        try{
+
+            PreparedStatement st = DatabaseConnection.getConnection().prepareStatement(sql);
+            st.setString(1, user.getUsername());
+            st.setString(2, user.getPassword());
+            st.setString(3, user.getEmail());
+            st.executeUpdate();
+            st.close();
+
+            return true;
+
+        } catch (SQLException e) {
+            System.err.println("Failed to save user " + e.getMessage());
+        }
 
         return false;
     }
 
     public User findByUsername(String username) {
 
-        // TODO:
+        String sql = "SELECT * FROM users WHERE username=?";
-        // Find a user by username
+        User result = null;
+
+        try{
+
+            PreparedStatement st = DatabaseConnection.getConnection().prepareStatement(sql);
+            st.setString(1, username);
+
+            ResultSet rs = st.executeQuery();
+            if(rs.next()){
+                result = new User(
+                        rs.getInt("id"),
+                        rs.getString("username"),
+                        rs.getString("password_hash"),
+                        rs.getString("email")
+                );
+            }
+            st.close();
+
+        } catch (SQLException e) {
+            System.err.println("Failed to fild user " + e.getMessage());
+        }
+
+        return result;
 
-        return null;
     }
 
 }

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 = "matin"; // Your Username
 
-    private static final String PASSWORD = "password"; // Your Password
+    private static final String PASSWORD = "0000"; // Your Password
 
     private DatabaseConnection() {
 
@@ -18,10 +19,8 @@ public class DatabaseConnection {
     public static Connection getConnection()
             throws SQLException {
 
-        // TODO:
+        return DriverManager.getConnection(URL, USER, PASSWORD);
-        // Return a valid PostgreSQL connection
 
-        return null;
     }
 
 }

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

@@ -3,13 +3,47 @@ package dev.model;
 public class MenuItem {
 
     private int id;
-
     private String name;
-
     private String description;
-
     private double price;
-
     private String category;
 
+    public MenuItem(int id, String name, String description, double price, String category) {
+        this.id = id;
+        this.name = name;
+        this.description = description;
+        this.price = price;
+        this.category = category;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public double getPrice() {
+        return price;
+    }
+
+    public String getCategory() {
+        return category;
+    }
+
+    @Override
+    public String toString() {
+        return "MenuItem{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                ", description='" + description + '\'' +
+                ", price=" + price +
+                ", category='" + category + '\'' +
+                '}';
+    }
 }

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

@@ -5,11 +5,62 @@ import java.time.LocalDateTime;
 public class Order {
 
     private int id;
-
     private int userId;
-
     private LocalDateTime createdAt;
+    private int totalPrice;
 
-    private double totalPrice;
+    public Order(int id, int totalPrice, LocalDateTime createdAt, int userId) {
+        this.id = id;
+        this.totalPrice = totalPrice;
+        this.createdAt = createdAt;
+        this.userId = userId;
+    }
 
+    public Order(int userId, LocalDateTime createdAt, int 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 getTotalPrice() {
+        return totalPrice;
+    }
+
+    public void setTotalPrice(int totalPrice) {
+        this.totalPrice = totalPrice;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public int getUserId() {
+        return userId;
+    }
+
+    public void setUserId(int userId) {
+        this.userId = userId;
+    }
+
+    @Override
+    public String toString() {
+        return "Order{" +
+                "id=" + id +
+                ", userId=" + userId +
+                ", createdAt=" + createdAt +
+                ", totalPrice=" + totalPrice +
+                '}';
+    }
 }

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

@@ -3,13 +3,74 @@ package dev.model;
 public class OrderDetail {
 
     private int id;
-
     private int orderId;
-
     private int menuItemId;
-
     private int quantity;
-
     private double price;
 
+    public OrderDetail(int id, int orderId, int menuItemId, int quantity, double price) {
+        this.id = id;
+        this.orderId = orderId;
+        this.menuItemId = menuItemId;
+        this.quantity = quantity;
+        this.price = price;
+    }
+
+    public OrderDetail(int orderId, int menuItemId, int quantity, double price) {
+        this.orderId = orderId;
+        this.menuItemId = menuItemId;
+        this.quantity = quantity;
+        this.price = price;
+    }
+
+    public double getPrice() {
+        return price;
+    }
+
+    public void setPrice(double price) {
+        this.price = price;
+    }
+
+    public int getQuantity() {
+        return quantity;
+    }
+
+    public void setQuantity(int quantity) {
+        this.quantity = quantity;
+    }
+
+    public int getMenuItemId() {
+        return menuItemId;
+    }
+
+    public void setMenuItemId(int menuItemId) {
+        this.menuItemId = menuItemId;
+    }
+
+    public int getOrderId() {
+        return orderId;
+    }
+
+    public void setOrderId(int orderId) {
+        this.orderId = orderId;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    @Override
+    public String toString() {
+        return "OrderDetail{" +
+                "id=" + id +
+                ", orderId=" + orderId +
+                ", menuItemId=" + menuItemId +
+                ", quantity=" + quantity +
+                ", price=" + price +
+                '}';
+    }
 }

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

@@ -3,11 +3,42 @@ package dev.model;
 public class User {
 
     private int id;
-
     private String username;
-
     private String password;
-
     private String email;
 
+    // verify user for the first time
+    public User(int id, String username, String password, String email){
+        this.id = id;
+        this.username = username;
+        this.password = password;
+        this.email = email;
+    }
+
+    // verified user
+    public User(String username, String password, String email){
+        this.username = username;
+        this.password = password;
+        this.email = email;
+    }
+
+    public void setId(int id){
+        this.id = id;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public String getEmail() {
+        return email;
+    }
 }

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

@@ -1,21 +1,40 @@
 package dev.service;
 
+import dev.dao.UserDao;
 import dev.model.User;
 
+import java.util.Objects;
+
 public class AuthService {
 
+    private final UserDao userDao = new UserDao();
+
     public boolean register(String username, String password, String email) {
 
-        // TODO:
+        User user = new User(
-        // Validate and register user
+                username,
+                String.valueOf(password.hashCode()),
+                email
+        );
+
+        if(userDao.save(user)){
+            System.out.println("Registered successfully");
+            return true;
+        }
 
         return false;
+
     }
 
     public User login(String username, String password) {
 
-        // TODO:
+        User userDB = userDao.findByUsername(username);
-        // Authenticate user
+
+        if(userDB == null) return null;
+
+        String userPasswordDB = userDB.getPassword();
+        if( Objects.equals( userPasswordDB, String.valueOf(password.hashCode()) ) )
+            return userDB;
 
         return null;
     }

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

@@ -1,11 +1,20 @@
 package dev.service;
 
+import dev.dao.MenuItemDao;
+import dev.model.MenuItem;
+
+import java.util.List;
+
 public class MenuService {
 
+    public static final MenuItemDao menuItemDao = new MenuItemDao();
+
     public void showMenu() {
 
-        // TODO:
+        List<MenuItem> items = menuItemDao.findAll();
-        // Display menu items
+        for(MenuItem item : items){
+            System.out.println(item);
+        }
 
     }
 

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

@@ -1,25 +1,141 @@
 package dev.service;
 
+import dev.dao.OrderDao;
+import dev.dao.OrderDetailDao;
+import dev.model.MenuItem;
+import dev.model.Order;
+import dev.model.OrderDetail;
+
+import java.time.LocalDateTime;
+import java.util.List;
+import java.util.Scanner;
+import java.util.ArrayList;
+
+
 public class OrderService {
 
+    private final static OrderDetailDao orderDetailDao = new OrderDetailDao();
+    private final static OrderDao orderDao = new OrderDao();
+    private final static MenuService menuService = new MenuService();
+    private final static Scanner scanner = new Scanner(System.in);
+
     public void placeOrder(int userId) {
 
-        // TODO:
+        List<MenuItem> menuItems = MenuService.menuItemDao.findAll();
-        // Create order
 
+        if (menuItems.isEmpty()) {
+            System.out.println("No menu items available.");
+            return;
+        }
+
+        // Display menu
+        System.out.println("========== MENU ==========");
+        for (MenuItem item : menuItems) {
+            System.out.printf("%-4d %-25s %10.2f%n",
+                    item.getId(), item.getName(), item.getPrice());
+        }
+        System.out.println("===========================");
+
+
+        Order order = new Order(userId, LocalDateTime.now(), 0);
+        int orderId = orderDao.save(order);
+
+        double totalPrice = 0;
+        boolean addingItems = true;
+
+        while (addingItems) {
+
+            System.out.print("Enter menu item id to add (0 to finish): ");
+            int menuId = Integer.parseInt(scanner.nextLine().trim());
+
+            if (menuId == 0) {
+                addingItems = false;
+                continue;
+            }
+
+            MenuItem selected = MenuService.menuItemDao.findById(menuId);
+
+            if (selected == null) {
+                System.out.println("Invalid item id, try again.");
+                continue;
+            }
+
+            System.out.print("Enter quantity: ");
+            int quantity = Integer.parseInt(scanner.nextLine().trim());
+
+            if (quantity <= 0) {
+                System.out.println("Quantity must be positive.");
+                continue;
+            }
+
+            OrderDetail detail = new OrderDetail(
+                    orderId,
+                    selected.getId(),
+                    quantity,
+                    selected.getPrice()
+            );
+
+            orderDetailDao.save(detail);
+
+            totalPrice += selected.getPrice() * quantity;
+
+            System.out.println(selected.getName() + " x" + quantity + " added.");
+        }
+
+        if (totalPrice == 0) {
+            System.out.println("No items were added. Order canceled.");
+            return;
+        }
+
+        order.setId(orderId);
+        order.setTotalPrice((int) totalPrice);
+        orderDao.save(order);
+
+        System.out.println("Order placed successfully. Order ID: " + orderId);
+        printReceipt(orderId);
     }
 
     public void printReceipt(int orderId) {
 
-        // TODO:
+        List<OrderDetail> details = orderDetailDao.findByOrderId(orderId);
-        // Print order receipt
+
+        if(details.isEmpty())
+            return;
+
+        System.out.println("Order ID: " + orderId);
+        double total = 0;
+        for (OrderDetail detail : details) {
+            double subtotal = detail.getPrice() * detail.getQuantity();
+            total += subtotal;
+            System.out.printf("%-20s %dx  $%.2f%n",
+                    MenuService.menuItemDao.findById(detail.getMenuItemId()).getName(),
+                    detail.getQuantity(),
+                    subtotal
+            );
+        }
+
+        System.out.println("---------------------------");
+        System.out.printf("Total: $%.2f%n", total);
+        System.out.println("===========================\n");
 
     }
 
     public void showOrderHistory(int userId) {
 
-        // TODO:
+        List<Order> orders = orderDao.findByUserId(userId);
-        // Display user's order history
+
+        if (orders.isEmpty()){
+            System.err.println("No orders found.");
+            return;
+        }
+
+        for (Order order : orders){
+            System.out.println("Order ID: " + order.getId());
+            System.out.println("Date: " + order.getCreatedAt());
+            System.out.printf("Total: $%.2f%n", order.getTotalPrice());
+            System.out.println("---------------------------------");
+            printReceipt(order.getId());
+        }
 
     }
 

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

@@ -1,11 +1,15 @@
 package dev.ui;
 
+import dev.model.User;
+import dev.service.AuthService;
+import dev.service.MenuService;
+
 import java.util.Scanner;
 
 public class ConsoleMenu {
 
-    private final Scanner scanner =
+    private final Scanner scanner = new Scanner(System.in);
-            new Scanner(System.in);
+    private final AuthService authService = new AuthService();
 
     public void start() {
 
@@ -21,13 +25,42 @@ public class ConsoleMenu {
 
             switch (choice) {
 
-                case 1:
+                case 1: {
-                    // TODO
+                    System.out.println("Enter username: ");
-                    break;
+                    String username = scanner.next();
+                    System.out.println("Enter password: ");
+                    String password = scanner.next();
 
-                case 2:
+                    User user = authService.login(username, password);
-                    // TODO
+
+                    if (user == null) {
+                        System.err.println("Unable to login");
+                        continue;
+                    }
+
+                    System.out.println("welcome! " + user.getUsername());
+                    MenuService menuService = new MenuService();
+                    menuService.showMenu();
                     break;
+                }
+
+                case 2: {
+                    System.out.println("Enter username: ");
+                    String username = scanner.nextLine();
+                    System.out.println("Enter password: ");
+                    String password = scanner.nextLine();
+                    System.out.println("Enter email: ");
+                    String email = scanner.nextLine();
+
+                    if (!authService.register(username, password, email)) {
+                        System.err.println("Registration failed.");
+                        continue;
+                    }
+
+                    System.out.println("Registered successfully.");
+
+                    break;
+                }
 
                 case 3:
                     return;