CartList.java

public class CartList {
    //Atributos
    private CartNode first;

    //Metodos

    //Constructor
    public CartList() {
        first = null;
    }

    //Getters
    public CartNode getFirst() {
        return first;
    }

    //Setters
    public void setFirst(CartNode newFirst) {
        first = newFirst;
    }

    //State
    public boolean isEmpty() {
        return first == null;
    }

    //Primera Inserción
    public void insertInitNode(Service serviceNode, int cuantityNode) {
        CartNode newCart = new CartNode(serviceNode, cuantityNode);
        newCart.setNext(first);
        setFirst(newCart);
    }

    //Insertar
    public void insert(Service service, int cuantity) {
        if (service == null || cuantity <= 0) return;

        
        if (first == null) {
            first = new CartNode(service, cuantity);
            return;
        }

        
        CartNode actual = first;
        CartNode last = null;
        while (actual != null) {
            if (actual.getService().getId() == service.getId()) {
                actual.setCuantity(actual.getCuantity() + cuantity);
                return;
            }
            last = actual;
            actual = actual.getNext();
        }
        last.setNext(new CartNode(service, cuantity));
    }

    //eliminar nodes
    public CartNode deleteNode(Service deleteService) {
        if (deleteService == null || first == null) {
            System.out.println("The node was not Found");
            return null;
        }

        
        if (first.getService().getId() == deleteService.getId()) {
            CartNode deleted = first;
            first = first.getNext();
            deleted.setNext(null);
            System.out.println("The searched node was not found");
            return deleted;
        }

        
        CartNode before = first;
        CartNode actual = first.getNext();
        while (actual != null && actual.getService().getId() != deleteService.getId()) {
            before = actual;
            actual = actual.getNext();
        }

        if (actual != null) {
            before.setNext(actual.getNext());
            actual.setNext(null);
            System.out.println("The searched node was not found");
            return actual;
        } else {
            System.out.println("The node was not found");
            return null;
        }

        
    }

    public void printCart() {
    if (first == null) {
        System.out.println("The cart is empty.");
        return;
    }

    CartNode actual = first;
    double total = 0;

    System.out.println("\nCart");
    while (actual != null) {
        Service s = actual.getService();
        int cuantity = actual.getCuantity();
        double subtotal = s.getPrice() * cuantity;

        System.out.println("ID " + s.getId() + " | " + s.getName() +
                           "  Cuantity " + cuantity +
                           "  Subtotal " + subtotal);
        total += subtotal;
        actual = actual.getNext();
    }
    System.out.println("TOTAL: " + total + "\n");
}




}