public class Main {

    public static void main(String[] args) {

        SalePoint salePoint = new SalePoint();

        Stack<String> inputArguments = new Stack<String>();
        inputArguments.push("0000000001");
        inputArguments.push("0000000002");
        inputArguments.push("0000000003");
        inputArguments.push("");
        inputArguments.push("exit");

        while(!inputArguments.isEmpty()){
            salePoint.getCodesScanner().write(inputArguments.pop());
        }

        salePoint.run();

    }
}

public class SalePoint {
    private InputDevice codesScanner = new CodesScanner();
    private OutputDevice lcdDisplay = new LCDDisplay();
    private OutputDevice printer = new Printer();

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

    public SalePoint(){
        Inventory.buildInventory();
    }

    public InputDevice getCodesScanner() {
        return codesScanner;
    }

    public List<Product> getProducts() {
        return products;
    }

        public void run() {
        Product product;
        String barCode;
        while((barCode = codesScanner.read()) != null) {
            switch (barCode) {
                case "":
                    lcdDisplay.printError("Invalid bar-code");
                    break;
                case "exit":
                    printProductsAndTotalPrice();
                    return;
                default:
                    product = Inventory.getProduct(barCode);
                     if (product == null) {
                         lcdDisplay.printError("Product not found");
                     }else {
                         lcdDisplay.print(product);
                         products.add(product);
                     }
            }
        }

    }

    private void printProductsAndTotalPrice() {
        double summ = 0.0;

        for (Product product :
                products)
            summ += product.getPrice();

        lcdDisplay.println("Total:\t\t\t" + summ);
        printer.println("List of products:");
        printer.println("Name\t\t\tPrice");
        printer.print(products);
        printer.println("Total:\t\t\t" + summ);

        products.clear();
    }
}