database

.idea/.gitignore

@@ -0,0 +1,10 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Ignored default folder with query files
+/queries/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.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/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="26" project-jdk-type="JavaSDK" />
+</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 +1,123 @@
--- Restaurant Database Management System
+
---
+
--- Instructions:
+DROP TABLE IF EXISTS order_details;
--- 1. Create all required tables.
+DROP TABLE IF EXISTS orders;
--- 2. Design appropriate PRIMARY KEY and FOREIGN KEY relationships.
+DROP TABLE IF EXISTS menu_items;
--- 3. Add suitable constraints based on the requirements.
+DROP TABLE IF EXISTS users;
--- 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 (
--- =======================================================
+
---
+                       id SERIAL PRIMARY KEY,
--- Represents customers using the system.
+
---
+                       username VARCHAR(50) UNIQUE NOT NULL,
--- Required information:
+
--- - Unique identifier
+                       password VARCHAR(255) NOT NULL,
--- - Username
+
--- - Password
+                       email VARCHAR(100)
--- - 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_items (
---
+
--- Represents available food and drink items.
+                            id SERIAL PRIMARY KEY,
---
+
--- Required information:
+                            name VARCHAR(100) NOT NULL,
--- - Unique identifier
+
--- - Name
+                            description TEXT,
--- - Description (optional)
+
--- - Price
+                            price NUMERIC(10,2) NOT NULL CHECK(price > 0),
--- - Category (optional)
+
---
+                            category VARCHAR(50)
--- 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,
---
+
--- Required information:
+                        user_id INTEGER NOT NULL,
--- - Unique identifier
+
--- - Reference to customer
+                        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
--- - Creation date and time
+
--- - Total price
+                        total_price NUMERIC(10,2) NOT NULL,
---
+
--- Requirements:
+
--- - Each order must belong to exactly one user.
+                        CONSTRAINT fk_order_user
--- - A user can have multiple orders.
+
--- - The relationship between User and Order must be implemented.
+                            FOREIGN KEY(user_id)
---
+
--- Note:
+                                REFERENCES users(id)
--- Avoid using reserved SQL keywords as table names.
+
--- Consider using a name such as "orders" or "customer_orders".
+                                ON DELETE CASCADE
---
+
--- CREATE TABLE ...
+);
 
 
 
--- =======================================================
+
--- ORDER DETAIL TABLE
+
--- =======================================================
+CREATE TABLE order_details (
---
+
--- Represents items inside an order.
+                               id SERIAL PRIMARY KEY,
---
+
--- Required information:
+
--- - Unique identifier
+                               order_id INTEGER NOT NULL,
--- - Reference to an order
+
--- - Reference to a menu item
+
--- - Quantity
+                               menu_item_id INTEGER NOT NULL,
--- - Item price at purchase time
+
---
+
--- Requirements:
+                               quantity INTEGER NOT NULL CHECK(quantity > 0),
--- - Each detail record must belong to one order.
+
--- - Each detail record must reference one menu item.
+
--- - Quantity must always be greater than zero.
+                               price NUMERIC(10,2) NOT NULL CHECK(price > 0),
--- - Store the item's price at the moment of purchase.
+
---
+
--- CREATE TABLE ...
+                               CONSTRAINT fk_detail_order
+
+                                   FOREIGN KEY(order_id)
+
+                                       REFERENCES orders(id)
+
+                                       ON DELETE CASCADE,
+
+
+                               CONSTRAINT fk_detail_menu
+
+                                   FOREIGN KEY(menu_item_id)
+
+                                       REFERENCES menu_items(id)
+
+);
 
 
 
--- =======================================================
--- INITIAL MENU DATA
--- =======================================================
---
--- Insert at least 3 food or drink items.
---
--- Example categories:
--- - Pizza
--- - Burger
--- - Pasta
--- - Drink
---
--- INSERT INTO ...
 
 
 
--- =======================================================
+INSERT INTO menu_items
--- OPTIONAL TEST DATA
+(name, description, price, category)
--- =======================================================
+
---
+VALUES
--- You may insert sample users and orders for testing.
+
--- This section is optional.
+    ('Pizza','Cheese pizza',10.00,'Pizza'),
---
+
--- INSERT INTO ...
+    ('Burger','Beef burger',8.00,'Burger'),
+
+    ('Pasta','Italian pasta',12.00,'Pasta'),
+
+    ('Cola','Cold drink',2.50,'Drink');
 
 
 
--- =======================================================
--- VERIFICATION QUERIES
--- =======================================================
---
--- Uncomment these queries to verify your database.
---
--- SELECT * FROM ...;
--- SELECT * FROM ...;
--- SELECT * FROM ...;
--- SELECT * FROM ...;

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

@@ -1,25 +1,133 @@
 package dev.dao;
 
+
+import dev.database.DatabaseConnection;
 import dev.model.MenuItem;
 
+
+import java.sql.*;
+import java.util.ArrayList;
 import java.util.List;
 
+
+
 public class MenuItemDao {
 
-    public List<MenuItem> findAll() {
 
-        // TODO:
-        // Retrieve all menu items
 
-        return null;
+    public List<MenuItem> findAll(){
+
+
+        List<MenuItem> list=new ArrayList<>();
+
+
+        String sql="SELECT * FROM menu_items";
+
+
+
+        try(Connection con =
+                    DatabaseConnection.getConnection();
+
+            PreparedStatement ps =
+                    con.prepareStatement(sql)){
+
+
+
+            ResultSet rs=ps.executeQuery();
+
+
+
+            while(rs.next()){
+
+
+                list.add(new MenuItem(
+
+                        rs.getInt("id"),
+
+                        rs.getString("name"),
+
+                        rs.getString("description"),
+
+                        rs.getDouble("price"),
+
+                        rs.getString("category")
+
+                ));
+
+            }
+
+
+
+        }catch(SQLException e){
+
+            e.printStackTrace();
+
+        }
+
+
+
+        return list;
+
     }
 
-    public MenuItem findById(int id) {
 
-        // TODO:
+
-        // Find menu item by id
+
+
+
+    public MenuItem findById(int id){
+
+
+        String sql =
+                "SELECT * FROM menu_items WHERE id=?";
+
+
+
+        try(Connection con =
+                    DatabaseConnection.getConnection();
+
+            PreparedStatement ps =
+                    con.prepareStatement(sql)){
+
+
+            ps.setInt(1,id);
+
+
+
+            ResultSet rs=ps.executeQuery();
+
+
+
+            if(rs.next()){
+
+
+                return new MenuItem(
+
+                        rs.getInt("id"),
+
+                        rs.getString("name"),
+
+                        rs.getString("description"),
+
+                        rs.getDouble("price"),
+
+                        rs.getString("category")
+
+                );
+
+            }
+
+
+
+        }catch(SQLException e){
+
+            e.printStackTrace();
+
+        }
+
 
         return null;
+
     }
 
 }

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

@@ -1,25 +1,130 @@
 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) {
 
-        // TODO:
+
-        // Insert order and return generated id
+        String sql =
+                "INSERT INTO orders(user_id,total_price) VALUES(?,?)";
+
+
+        try(Connection con = DatabaseConnection.getConnection();
+
+            PreparedStatement ps =
+                    con.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS)){
+
+
+            ps.setInt(1, order.getUserId());
+
+            ps.setDouble(2, order.getTotalPrice());
+
+
+            ps.executeUpdate();
+
+
+
+            ResultSet rs = ps.getGeneratedKeys();
+
+
+            if(rs.next()){
+
+                return rs.getInt(1);
+
+            }
+
+
+        }catch(SQLException e){
+
+            e.printStackTrace();
+
+        }
+
 
         return -1;
+
     }
 
-    public List<Order> findByUserId(int userId) {
 
-        // TODO:
-        // Retrieve all orders of a user
 
-        return null;
+
+    public List<Order> findByUserId(int userId){
+
+
+        List<Order> orders = new ArrayList<>();
+
+
+        String sql =
+                "SELECT * FROM orders WHERE user_id=?";
+
+
+        try(Connection con = DatabaseConnection.getConnection();
+
+            PreparedStatement ps =
+                    con.prepareStatement(sql)){
+
+
+            ps.setInt(1,userId);
+
+
+
+            ResultSet rs = ps.executeQuery();
+
+
+
+            while(rs.next()){
+
+
+                Order order = new Order();
+
+
+                order.setId(rs.getInt("id"));
+
+                order.setUserId(rs.getInt("user_id"));
+
+                order.setTotalPrice(
+                        rs.getDouble("total_price")
+                );
+
+
+                Timestamp timestamp =
+                        rs.getTimestamp("created_at");
+
+
+                if(timestamp != null){
+
+                    order.setCreatedAt(
+                            timestamp.toLocalDateTime()
+                    );
+
+                }
+
+
+                orders.add(order);
+
+            }
+
+
+
+        }catch(SQLException e){
+
+            e.printStackTrace();
+
+        }
+
+
+        return orders;
+
     }
 
+
 }

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

@@ -1,24 +1,144 @@
 package dev.dao;
 
+
+import dev.database.DatabaseConnection;
 import dev.model.OrderDetail;
 
+
+import java.sql.*;
+import java.util.ArrayList;
 import java.util.List;
 
+
+
 public class OrderDetailDao {
 
-    public void save(OrderDetail detail) {
 
-        // TODO:
+
-        // Insert order detail
+    public void save(OrderDetail detail){
+
+
+
+        String sql =
+                """
+                INSERT INTO order_details
+                (order_id,menu_item_id,quantity,price)
+                VALUES(?,?,?,?)
+                """;
+
+
+
+        try(Connection con =
+                    DatabaseConnection.getConnection();
+
+            PreparedStatement ps =
+                    con.prepareStatement(sql)){
+
+
+
+            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){
+
+            e.printStackTrace();
+
+        }
+
 
     }
 
-    public List<OrderDetail> findByOrderId(int orderId) {
 
-        // TODO:
-        // Retrieve order details
 
-        return null;
+
+
+    public List<OrderDetail> findByOrderId(int orderId){
+
+
+        List<OrderDetail> list =
+                new ArrayList<>();
+
+
+        String sql =
+                "SELECT * FROM order_details WHERE order_id=?";
+
+
+
+        try(Connection con =
+                    DatabaseConnection.getConnection();
+
+            PreparedStatement ps =
+                    con.prepareStatement(sql)){
+
+
+            ps.setInt(1,orderId);
+
+
+
+            ResultSet rs =
+                    ps.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")
+                );
+
+
+                list.add(detail);
+
+
+            }
+
+
+
+        }catch(SQLException e){
+
+            e.printStackTrace();
+
+        }
+
+
+        return list;
+
     }
 
+
 }

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

@@ -1,23 +1,109 @@
 package dev.dao;
 
+
+import dev.database.DatabaseConnection;
 import dev.model.User;
 
+
+import java.sql.*;
+
+
+
 public class UserDao {
 
-    public boolean save(User user) {
 
-        // TODO:
+
-        // Insert user into database
+    public boolean save(User user){
+
+
+        String sql =
+                "INSERT INTO users(username,password,email) VALUES(?,?,?)";
+
+
+        try(Connection con =
+                    DatabaseConnection.getConnection();
+
+            PreparedStatement ps =
+                    con.prepareStatement(sql)){
+
+
+            ps.setString(1,user.getUsername());
+
+            ps.setString(2,user.getPassword());
+
+            ps.setString(3,user.getEmail());
+
+
+            ps.executeUpdate();
+
+
+            return true;
+
+
+        }catch(SQLException e){
+
+            e.printStackTrace();
+
+        }
+
 
         return false;
+
     }
 
-    public User findByUsername(String username) {
 
-        // TODO:
+
-        // Find a user by username
+
+
+    public User findByUsername(String username){
+
+
+        String sql =
+                "SELECT * FROM users WHERE username=?";
+
+
+        try(Connection con =
+                    DatabaseConnection.getConnection();
+
+            PreparedStatement ps =
+                    con.prepareStatement(sql)){
+
+
+            ps.setString(1,username);
+
+
+
+            ResultSet rs=ps.executeQuery();
+
+
+
+            if(rs.next()){
+
+
+                return new User(
+
+                        rs.getInt("id"),
+
+                        rs.getString("username"),
+
+                        rs.getString("password"),
+
+                        rs.getString("email")
+
+                );
+
+            }
+
+
+        }catch(SQLException e){
+
+            e.printStackTrace();
+
+        }
+
 
         return null;
+
     }
 
 }

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

@@ -1,27 +1,43 @@
 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 URL =
+            "jdbc:postgresql://localhost:5432/restaurant_db";
 
-    private static final String PASSWORD = "password"; // Your Password
 
-    private DatabaseConnection() {
+    private static final String USER =
+            "postgres";
+
+
+    private static final String PASSWORD =
+            "neda3113";
+
+
+
+    private 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

@@ -1,7 +1,9 @@
 package dev.model;
 
+
 public class MenuItem {
 
+
     private int id;
 
     private String name;
@@ -12,4 +14,74 @@ public class MenuItem {
 
     private String category;
 
+
+
+    public MenuItem(){
+
+    }
+
+
+    public MenuItem(int id,String name,String description,
+                    double price,String category){
+
+        this.id=id;
+        this.name=name;
+        this.description=description;
+        this.price=price;
+        this.category=category;
+
+    }
+
+
+
+    public int getId(){
+        return id;
+    }
+
+
+    public void setId(int id){
+        this.id=id;
+    }
+
+
+    public String getName(){
+        return name;
+    }
+
+
+    public void setName(String name){
+        this.name=name;
+    }
+
+
+    public String getDescription(){
+        return description;
+    }
+
+
+    public void setDescription(String description){
+        this.description=description;
+    }
+
+
+    public double getPrice(){
+        return price;
+    }
+
+
+    public void setPrice(double price){
+        this.price=price;
+    }
+
+
+    public String getCategory(){
+        return category;
+    }
+
+
+    public void setCategory(String category){
+        this.category=category;
+    }
+
+
 }

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

@@ -1,9 +1,12 @@
 package dev.model;
 
+
 import java.time.LocalDateTime;
 
+
 public class Order {
 
+
     private int id;
 
     private int userId;
@@ -12,4 +15,61 @@ public class Order {
 
     private double totalPrice;
 
+
+
+    public Order(){
+
+    }
+
+
+
+    public Order(int userId,double totalPrice){
+
+        this.userId=userId;
+        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

@@ -1,7 +1,9 @@
 package dev.model;
 
+
 public class OrderDetail {
 
+
     private int id;
 
     private int orderId;
@@ -12,4 +14,75 @@ 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

@@ -3,11 +3,67 @@ package dev.model;
 public class User {
 
     private int id;
-
     private String username;
-
     private String password;
-
     private String email;
 
+
+    public User() {
+
+    }
+
+
+    public User(String username, String password, String email) {
+        this.username = username;
+        this.password = password;
+        this.email = email;
+    }
+
+
+    public User(int id, String username, String password, String email) {
+        this.id = id;
+        this.username = username;
+        this.password = password;
+        this.email = email;
+    }
+
+
+    public int getId() {
+        return id;
+    }
+
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+
+    public String getUsername() {
+        return username;
+    }
+
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+
+    public String getPassword() {
+        return password;
+    }
+
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+
+    public String getEmail() {
+        return email;
+    }
+
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
 }

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

@@ -1,23 +1,136 @@
 package dev.service;
 
+
+import dev.dao.UserDao;
 import dev.model.User;
 
+
+import java.security.MessageDigest;
+
+
+
 public class AuthService {
 
-    public boolean register(String username, String password, String email) {
 
-        // TODO:
+    private final UserDao userDao =
-        // Validate and register user
+            new UserDao();
 
-        return false;
+
+
+
+    public boolean register(String username,
+                            String password,
+                            String email){
+
+
+
+        User existingUser = userDao.findByUsername(username);
+
+        if (existingUser != null) {
+            return false;
+        }
+
+
+        String hashedPassword = hashPassword(password);
+
+
+        User user = new User(username, hashedPassword, email);
+
+
+        return userDao.save(user);
     }
 
-    public User login(String username, String password) {
 
-        // TODO:
+
-        // Authenticate user
+
+
+
+    public User login(String username,
+                      String password){
+
+
+
+        User user =
+                userDao.findByUsername(username);
+
+
+
+        if(user==null){
+
+            return null;
+
+        }
+
+
+
+        String hashed =
+                hashPassword(password);
+
+
+
+        if(user.getPassword().equals(hashed)){
+
+
+            return user;
+
+        }
+
+
 
         return null;
+
+
     }
 
+
+
+
+
+    private String hashPassword(String password){
+
+
+        try{
+
+
+            MessageDigest md =
+                    MessageDigest.getInstance("SHA-256");
+
+
+            byte[] bytes =
+                    md.digest(
+                            password.getBytes()
+                    );
+
+
+
+            StringBuilder sb =
+                    new StringBuilder();
+
+
+
+            for(byte b:bytes){
+
+
+                sb.append(
+                        String.format("%02x",b)
+                );
+
+
+            }
+
+
+            return sb.toString();
+
+
+
+        }catch(Exception e){
+
+            throw new RuntimeException(e);
+
+        }
+
+
+    }
+
+
 }

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

@@ -1,12 +1,54 @@
 package dev.service;
 
+
+import dev.dao.MenuItemDao;
+import dev.model.MenuItem;
+
+
+import java.util.List;
+
+
+
 public class MenuService {
 
-    public void showMenu() {
 
-        // TODO:
+    private final MenuItemDao dao =
-        // Display menu items
+            new MenuItemDao();
+
+
+
+    public void showMenu(){
+
+
+        List<MenuItem> items =
+                dao.findAll();
+
+
+
+        System.out.println(
+                "========== MENU =========="
+        );
+
+
+
+        for(MenuItem item:items){
+
+
+            System.out.println(
+
+                    item.getId()
+                            +" - "
+                            +item.getName()
+                            +" $"
+                            +item.getPrice()
+
+            );
+
+
+        }
+
 
     }
 
+
 }

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

@@ -1,26 +1,300 @@
 package dev.service;
 
+
+import dev.dao.MenuItemDao;
+import dev.dao.OrderDao;
+import dev.dao.OrderDetailDao;
+
+import dev.model.MenuItem;
+import dev.model.Order;
+import dev.model.OrderDetail;
+
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Scanner;
+
+
+
 public class OrderService {
 
-    public void placeOrder(int userId) {
 
-        // TODO:
+    private final MenuItemDao menuDao =
-        // Create order
+            new MenuItemDao();
+
+
+    private final OrderDao orderDao =
+            new OrderDao();
+
+
+    private final OrderDetailDao detailDao =
+            new OrderDetailDao();
+
+
+
+    public int placeOrder(int userId){
+
+
+        Scanner scanner =
+                new Scanner(System.in);
+
+
+
+        List<OrderDetail> cart =
+                new ArrayList<>();
+
+
+        double total = 0;
+
+
+
+        while(true){
+
+
+            System.out.println(
+                    "Enter menu item id (0 finish): "
+            );
+
+
+            int itemId =
+                    scanner.nextInt();
+
+
+
+            if(itemId == 0){
+
+                break;
+
+            }
+
+
+
+            MenuItem item =
+                    menuDao.findById(itemId);
+
+
+
+            if(item == null){
+
+                System.out.println(
+                        "Item not found!"
+                );
+
+                continue;
+
+            }
+
+
+
+            System.out.println(
+                    "Enter quantity:"
+            );
+
+
+            int quantity =
+                    scanner.nextInt();
+
+
+
+            OrderDetail detail =
+                    new OrderDetail(
+                            0,
+                            item.getId(),
+                            quantity,
+                            item.getPrice()
+                    );
+
+
+
+            cart.add(detail);
+
+
+
+            total +=
+                    item.getPrice()
+                            *
+                            quantity;
+
+
+
+            System.out.println(
+                    "Added to cart."
+            );
+
+
+        }
+
+
+
+        if(cart.isEmpty()){
+
+            System.out.println(
+                    "Cart is empty"
+            );
+
+            return -1;
+
+        }
+
+
+
+        // Save Order first
+
+        Order order =
+                new Order(
+                        userId,
+                        total
+                );
+
+
+
+        int orderId =
+                orderDao.save(order);
+
+
+
+
+
+        for(OrderDetail detail:cart){
+
+
+            detail.setOrderId(orderId);
+
+
+            detailDao.save(detail);
+
+
+        }
+
+
+
+        System.out.println(
+                "Order created successfully!"
+        );
+
+
+        printReceipt(orderId);
+
+
+
+        return orderId;
+
 
     }
 
-    public void printReceipt(int orderId) {
 
-        // TODO:
+
-        // Print order receipt
+
+
+
+
+    public void printReceipt(int orderId){
+
+
+
+        System.out.println(
+                "\n========== RECEIPT =========="
+        );
+
+
+
+        List<OrderDetail> details =
+                detailDao.findByOrderId(orderId);
+
+
+
+        double total = 0;
+
+
+
+        for(OrderDetail d:details){
+
+
+
+            MenuItem item =
+                    menuDao.findById(
+                            d.getMenuItemId()
+                    );
+
+
+
+            double subtotal =
+                    d.getQuantity()
+                            *
+                            d.getPrice();
+
+
+
+            total += subtotal;
+
+
+
+            System.out.println(
+                    item.getName()
+                            +" | Qty: "
+                            +d.getQuantity()
+                            +" | Unit: $"
+                            +d.getPrice()
+                            +" | Total: $"
+                            +subtotal
+            );
+
+        }
+
+
+
+        System.out.println(
+                "----------------------------"
+        );
+
+
+        System.out.println(
+                "Grand Total: $"
+                        +total
+        );
+
+
+        System.out.println(
+                "============================"
+        );
+
 
     }
 
-    public void showOrderHistory(int userId) {
 
-        // TODO:
+
-        // Display user's order history
+
+
+
+
+    public void showOrderHistory(int userId){
+
+
+
+        System.out.println(
+                "\n======= ORDER HISTORY ======="
+        );
+
+
+
+        for(Order order:
+                orderDao.findByUserId(userId)){
+
+
+
+            System.out.println(
+                    "Order ID: "
+                            +order.getId()
+                            +
+                            " Total: $"+
+                            order.getTotalPrice()
+            );
+
+
+        }
+
 
     }
 
+
 }

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

@@ -1,44 +1,302 @@
 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);
 
-    public void start() {
 
-        while (true) {
 
-            System.out.println();
+    private final AuthService authService =
-            System.out.println("===== JAVA PIZZERIA =====");
+            new AuthService();
-            System.out.println("1. Login");
-            System.out.println("2. Register");
-            System.out.println("3. Exit");
 
-            int choice = scanner.nextInt();
 
-            switch (choice) {
+    private final MenuService menuService =
+            new MenuService();
+
+
+    private final OrderService orderService =
+            new OrderService();
+
+
+
+    private User currentUser;
+
+
+
+
+
+    public void start(){
+
+
+
+        while(true){
+
+
+
+            System.out.println(
+                    """
+                    =======================================
+                        🍕 WELCOME TO JAVA PIZZERIA 🍕
+                    =======================================
+                            
+                      1. Login
+                      2. Register New Account
+                      3. Exit
+
+                      Choose an option:
+                    """
+            );
+
+
+
+            int choice =
+                    scanner.nextInt();
+
+
+
+            scanner.nextLine();
+
+
+
+            switch(choice){
+
 
                 case 1:
-                    // TODO
+
+                    login();
+
                     break;
 
+
+
                 case 2:
-                    // TODO
+
+                    register();
+
                     break;
 
+
+
                 case 3:
+
+                    System.out.println(
+                            "Goodbye!"
+                    );
+
                     return;
 
+
+
                 default:
-                    System.out.println("Invalid choice");
+
+                    System.out.println(
+                            "Invalid option"
+                    );
 
             }
 
+
         }
 
+
     }
 
+
+
+
+
+
+
+
+    private void register() {
+
+        System.out.println("Username:");
+        String username = scanner.nextLine();
+
+        System.out.println("Password:");
+        String password = scanner.nextLine();
+
+        System.out.println("Email:");
+        String email = scanner.nextLine();
+
+        boolean success = authService.register(username, password, email);
+
+        if (success) {
+            System.out.println("Registration successful!");
+        } else {
+            System.out.println("Username already exists!");
+        }
+    }
+
+
+
+
+
+
+
+
+
+    private void login(){
+
+
+        System.out.println(
+                "Username:"
+        );
+
+        String username =
+                scanner.nextLine();
+
+
+
+        System.out.println(
+                "Password:"
+        );
+
+        String password =
+                scanner.nextLine();
+
+
+
+
+        currentUser =
+                authService.login(
+                        username,
+                        password
+                );
+
+
+
+        if(currentUser != null){
+
+
+            System.out.println(
+                    "Login successful"
+            );
+
+
+            mainMenu();
+
+
+        }
+
+        else{
+
+
+            System.out.println(
+                    "Wrong username or password"
+            );
+
+
+        }
+
+
+    }
+
+
+
+
+
+
+
+    private void mainMenu(){
+
+
+
+        while(currentUser != null){
+
+
+
+            System.out.println(
+                    """
+                    =======================================
+                              🍽️ MAIN MENU 🍽️
+                    =======================================
+                    1. View Menu
+                    2. Place Order
+                    3. Order History
+                    4. Logout
+                    =========================
+                    """
+            );
+
+
+
+            int choice =
+                    scanner.nextInt();
+
+
+
+            switch(choice){
+
+
+                case 1:
+
+                    menuService.showMenu();
+
+                    break;
+
+
+
+                case 2:
+
+                    orderService.placeOrder(
+                            currentUser.getId()
+                    );
+
+                    break;
+
+
+
+                case 3:
+
+                    orderService.showOrderHistory(
+                            currentUser.getId()
+                    );
+
+                    break;
+
+
+
+                case 4:
+
+                    currentUser=null;
+
+                    System.out.println(
+                            "Logged out"
+                    );
+
+                    break;
+
+
+
+                default:
+
+                    System.out.println(
+                            "Invalid option"
+                    );
+
+
+            }
+
+
+        }
+
+
+    }
+
+
 }