Online-Shop/Cart.java

package Shop;
import Shop.Products;
import java.util.ArrayList;

public class Cart {
    private static ArrayList<Products> cartContents;

    public Cart() {
        cartContents = new ArrayList<Products>();
    }


    //Adding stuff to Cart (adding stuff to cart means removing from stock)
    public static boolean AddCart(Products prod, int amount){
        if (prod.getStock() > 0)  {                     // checking if product is in stock
            cartContents.add(prod);                     // adding to cart
            prod.setStock(prod.getStock() - amount);         // removing from stock
            return true;
        }
        return false;
    }

    public int NumberOfArticels (Products prod){
        int nums = 0;
        for(Products p: cartContents){
            if(p.equals(prod)){
                nums++;
            }
        }
        return nums;
    }

    //removing stuff from cart (means adding back to stock)
    public boolean RemoveCart(Products prod, int amount){
        if ( NumberOfArticels(prod) > 0)  {                     // checking if product is in stock
            if(cartContents.remove(prod)){                     // removing from cart
            prod.setStock(prod.getStock() + amount);         // adding back to stock
            return true;
            }
        }
        return false;
    }

    public int AmountAllCart (){
        return cartContents.size();
    }

    public double GrossAmountProd (){
        double gross = 0.0;
        for(Products prod: cartContents) {
            gross += prod.getGrossPrice();
        }
          return gross;
    }

    public double ContentsMass() {
        double weights = 0.0;
        for(Products prod: cartContents) {
            weights += prod.getWeight();
        }
        return weights;
    }

    public double ContentsNetWorth() {
        double netWorth = 0.0;
        for(Products prod: cartContents) {
            netWorth += prod.getNetWorth();
        }
        return netWorth;
    }


    public double deliveryCost () {

        double weight = ContentsMass();
        double delivery = 0;

            //Bedingungen für die Versandkosten:
        if ( weight <= 0.1) {
                delivery = 3.95;
            }
            else if (weight > 0.1 && weight <= 1.0) {
                    delivery = 4.95;
            }
                else if (weight> 1.0 && weight <= 5.0 ) {
                    delivery = 5.95;
                }
                         else if (weight > 5.0) {
                                 delivery = 19.95;
                         }


                         if (GrossAmountProd() >= 500) { //Brutto == Warenwert
                            delivery = 0;}

        return delivery;
    }


    public double taxDelivery(){
            double delivery = deliveryCost ();

            double tax7perc = 0;        // grosstax is 7%  which means: 1/3rd of 19,95
            double tax19perc = 0;       // grosstax is 19%  which means: 2/3rd of 19,95

            for (Products prod : cartContents) {
                if (prod.getNetWorth() == 7) {
                    tax7perc += prod.getGrossPrice();
                }
                else if (prod.getNetWorth() == 19) {
                    tax19perc += prod.getGrossPrice();
                }
            }
            //Prozentuale Anteile am gesamten Bruttopreis:
            double gross = GrossAmountProd ();


            if (gross == 0) { //Um Teilung durch 0 zu verhindern (wenn Warenkorb leer)
                return 0;
            }

            //Anteile am Versand:
            double delivery7 = delivery * (tax7perc / gross);
            double delivery19 = delivery * (tax19perc / gross);

            //MwSt vom Versand:
            double taxDelivery7 = delivery7- (delivery7/ 1.07);
            double taxDelivery19 = delivery19 - (delivery19 / 1.19);

            return taxDelivery7 + taxDelivery19;
        }



    public double wholeAmount () {

        double amount = GrossAmountProd () + deliveryCost () + taxDelivery();


        return amount;
    }


}