import java.util.HashMap;

public class Calculator {

private double orderSum;

private final HashMap<Good, Integer> order = new HashMap<>();

public void addGood(Good good, int quantity) {

if (order.containsKey(good)) {

int oldQuantity = order.get(good);

int newQuantity = oldQuantity + quantity;

order.put(good, newQuantity);

} else {

order.put(good, quantity);

}

orderSum = calculate();

}

private double calculate() {

double sum = 0;

for (Good good : order.keySet()) {

int quantity = order.get(good);

sum += good.price * quantity;

}

return sum;

}

public void showOrder() {

System.out.println("Добавленные товары:");

for (Good good : order.keySet()) {

System.out.println(good.name + " " + String.format("%.2f", good.price));

}

}

public double getOrderSum() {

return orderSum;

}

public String getRubleInRightFormat(double rubles) {

int lastDigit = (int) (Math.floor(rubles) % 10);

if (((int) (Math.floor(rubles) % 100))<=19 && ((int) (Math.floor(rubles) % 100))>=11)

return "рублей";

switch (lastDigit) {

case 1:

return "рубль";

case 2:

case 3:

case 4:

return "рубля";

default:

return "рублей";

}

}

}