OnlineShopCLI/src/main/java/org/example/ShoppingCart.java

package org.example;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

public class ShoppingCart {

    HashMap<Product, Integer> products = new HashMap<>();

    public void addProduct(Product product) {
        int currentQuantity = products.getOrDefault(product, 0);
        setProductQuantity(product, currentQuantity + 1);
    }

    public void removeProduct(Product product) {
        int currentQuantity = products.getOrDefault(product, 0);
        setProductQuantity(product, currentQuantity == 0 ? 0 : currentQuantity - 1);
    }

    public void setProductQuantity(Product product, int quantity) {
        if (quantity > 0) {
            products.put(product, quantity);
        } else {
            products.remove(product);
        }
    }

    public int getProductQuantity(Product product) {
        return products.getOrDefault(product, 0);
    }

    public void clearProducts() {
        products.clear();
    }

    public Order toOrder() {
        List<Product> productsInOrder = new ArrayList<>();
        for (HashMap.Entry<Product, Integer> entry : products.entrySet()) {
            Product product = entry.getKey();
            int quantity = entry.getValue();
            for (int i = 0; i < quantity; i++) {
                productsInOrder.add(product);
            }
        }
        return new Order(productsInOrder);
    }
}