import java.util.ArrayList;

import java.util.List;

import java.util.Scanner;

// Base Product class

class Product {

private static int idCounter = 1000;

private int productId;

private String name;

private double price;

private int stockQuantity;

public Product(String name, double price, int stockQuantity) {

this.productId = ++idCounter;

this.name = name;

this.price = price;

this.stockQuantity = stockQuantity;

}

public int getProductId() {

return productId;

}

public String getName() {

return name;

}

public double getPrice() {

return price;

}

public int getStockQuantity() {

return stockQuantity;

}

public void reduceStock(int quantity) {

if (quantity <= stockQuantity) {

stockQuantity -= quantity;

}

}

public void displayProduct() {

System.out.println("Product ID: " + productId + ", Name: " + name + ", Price: " + price + ", Stock: " + stockQuantity);

}

}

// Electronics subclass

class Electronics extends Product {

private String brand;

private int warrantyPeriod; // in months

public Electronics(String name, double price, int stockQuantity, String brand, int warrantyPeriod) {

super(name, price, stockQuantity);

this.brand = brand;

this.warrantyPeriod = warrantyPeriod;

}

public String getBrand() {

return brand;

}

public int getWarrantyPeriod() {

return warrantyPeriod;

}

}

// Clothing subclass

class Clothing extends Product {

private String size;

private String color;

public Clothing(String name, double price, int stockQuantity, String size, String color) {

super(name, price, stockQuantity);

this.size = size;

this.color = color;

}

public String getSize() {

return size;

}

public String getColor() {

return color;

}

}

class Customer {

private static int idCounter = 2000;

private int customerId;

private String name;

private String email;

private List<Order> orderHistory;

public Customer(String name, String email) {

this.customerId = ++idCounter;

this.name = name;

this.email = email;

this.orderHistory = new ArrayList<>();

}

public int getCustomerId() {

return customerId;

}

public String getName() {

return name;

}

public String getEmail() {

return email;

}

public List<Order> getOrderHistory() {

return orderHistory;

}

public void addOrder(Order order) {

orderHistory.add(order);

}

public void displayCustomerInfo() {

System.out.println("Customer ID: " + customerId + ", Name: " + name + ", Email: " + email);

}

}

class Order {

private static int orderCounter = 3000;

private int orderId;

private Customer customer;

private List<Product> products;

private double totalAmount;

public Order(Customer customer, Product product, int quantity) {

this.orderId = ++orderCounter;

this.customer = customer;

this.products = new ArrayList<>();

addProduct(product, quantity);

customer.addOrder(this);

}

public Order(Customer customer, List<Product> products) {

this.orderId = ++orderCounter;

this.customer = customer;

this.products = products;

calculateTotal();

customer.addOrder(this);

}

public int getOrderId() {

return orderId;

}

public Customer getCustomer() {

return customer;

}

public List<Product> getProducts() {

return products;

}

private void addProduct(Product product, int quantity) {

if (product.getStockQuantity() >= quantity) {

product.reduceStock(quantity);

products.add(product);

totalAmount += product.getPrice() * quantity;

} else {

System.out.println("Insufficient stock for product: " + product.getName());

}

}

private void calculateTotal() {

totalAmount = 0;

for (Product product : products) {

totalAmount += product.getPrice();

}

}

public double getTotalAmount() {

return totalAmount;

}

public void displayOrderDetails() {

System.out.println("Order ID: " + orderId + ", Customer: " + customer.getName() + ", Total Amount: " + totalAmount);

System.out.println("Products:");

for (Product product : products) {

product.displayProduct();

}

}

}

public class ECommercePlatform {

public static void main(String[] args) {

Scanner scanner = new Scanner(System.in);

List<Product> products = new ArrayList<>();

List<Customer> customers = new ArrayList<>();

// Sample data for testing

products.add(new Electronics("Laptop", 800, 10, "Dell", 24));

products.add(new Clothing("T-Shirt", 20, 50, "L", "Red"));

try {

while (true) {

System.out.println("\n1. Add Customer\n2. Place Order\n3. View Customer Orders\n4. View Products\n5. Exit");

System.out.print("Choose an option: ");

int choice = Integer.parseInt(scanner.nextLine());

if (choice == 1) {

System.out.print("Enter Customer Name: ");

String name = scanner.nextLine();

System.out.print("Enter Customer Email: ");

String email = scanner.nextLine();

Customer customer = new Customer(name, email);

customers.add(customer);

System.out.println("Customer Registered with ID: " + customer.getCustomerId());

} else if (choice == 2) {

System.out.print("Enter Customer ID: ");

int customerId = Integer.parseInt(scanner.nextLine());

Customer customer = findCustomerById(customers, customerId);

if (customer != null) {

System.out.print("Enter Product ID: ");

int productId = Integer.parseInt(scanner.nextLine());

Product product = findProductById(products, productId);

if (product != null) {

System.out.print("Enter Quantity: ");

int quantity = Integer.parseInt(scanner.nextLine());

new Order(customer, product, quantity);

System.out.println("Order placed successfully!");

} else {

System.out.println("Product not found.");

}

} else {

System.out.println("Customer not found.");

}

} else if (choice == 3) {

System.out.print("Enter Customer ID: ");

int customerId = Integer.parseInt(scanner.nextLine());

Customer customer = findCustomerById(customers, customerId);

if (customer != null) {

customer.displayCustomerInfo();

for (Order order : customer.getOrderHistory()) {

order.displayOrderDetails();

}

} else {

System.out.println("Customer not found.");

}

} else if (choice == 4) {

System.out.println("Product List:");

for (Product product : products) {

product.displayProduct();

}

} else if (choice == 5) {

System.out.println("Exiting the system.");

break;

} else {

System.out.println("Invalid choice. Please try again.");

}

}

} catch (NumberFormatException e) {

System.out.println("Invalid input. Please enter correct data.");

} finally {

scanner.close();

}

}

private static Customer findCustomerById(List<Customer> customers, int id) {

for (Customer customer : customers) {

if (customer.getCustomerId() == id) {

return customer;

}

}

return null;

}

private static Product findProductById(List<Product> products, int id) {

for (Product product : products) {

if (product.getProductId() == id) {

return product;

}

}

return null;

}

}