@Named("dndCarsView")
@ViewScoped
public class DNDCarsView implements Serializable {
 
    @Inject
    private CarService service;

    private List<Car> cars;
    
    private List<Car> droppedCars;
    
    private Car selectedCar;
    
    @PostConstruct
    public void init() {
        cars = service.createCars(9);
        droppedCars = new ArrayList<>();
    }
    
    public void onCarDrop(DragDropEvent<Car> ddEvent) {
        Car car = ddEvent.getData();
 
        droppedCars.add(car);
        cars.remove(car);
    }
    
    public void setService(CarService service) {
        this.service = service;
    }

    public List<Car> getCars() {
        return cars;
    }

    public List<Car> getDroppedCars() {
        return droppedCars;
    }    

    public Car getSelectedCar() {
        return selectedCar;
    }

    public void setSelectedCar(Car selectedCar) {
        this.selectedCar = selectedCar;
    }
}

@Named
@ApplicationScoped
public class CarService {
    
    private final static String[] colors;
	
	private final static String[] brands;
    
    static {
		colors = new String[10];
		colors[0] = "Black";
		colors[1] = "White";
		colors[2] = "Green";
		colors[3] = "Red";
		colors[4] = "Blue";
		colors[5] = "Orange";
		colors[6] = "Silver";
		colors[7] = "Yellow";
		colors[8] = "Brown";
		colors[9] = "Maroon";
		
		brands = new String[10];
		brands[0] = "BMW";
		brands[1] = "Mercedes";
		brands[2] = "Volvo";
		brands[3] = "Audi";
		brands[4] = "Renault";
		brands[5] = "Fiat";
		brands[6] = "Volkswagen";
		brands[7] = "Honda";
		brands[8] = "Jaguar";
		brands[9] = "Ford";
	}
    
    public List<Car> createCars(int size) {
        List<Car> list = new ArrayList<Car>();
		for(int i = 0 ; i < size ; i++) {
			list.add(new Car(getRandomId(), getRandomBrand(), getRandomYear(), getRandomColor(), getRandomPrice(), getRandomSoldState()));
        }
        
        return list;
    }
    
    private String getRandomId() {
		return UUID.randomUUID().toString().substring(0, 8);
	}
    
    private int getRandomYear() {
		return (int) (Math.random() * 50 + 1960);
	}
	
	private String getRandomColor() {
		return colors[(int) (Math.random() * 10)];
	}
	
	private String getRandomBrand() {
		return brands[(int) (Math.random() * 10)];
	}
    
    private int getRandomPrice() {
		return (int) (Math.random() * 100000);
	}
    
    private boolean getRandomSoldState() {
		return (Math.random() > 0.5) ? true: false;
	}
    
    public List<String> getColors() {
        return Arrays.asList(colors);
    }
    
    public List<String> getBrands() {
        return Arrays.asList(brands);
    }
}

public class Car implements Serializable {
    
    public String id;
    public String brand;
    public int year;
    public String color;
    public int price;
    public boolean sold;

    public Car() {}
    
    public Car(String id, String brand, int year, String color) {
        this.id = id;
        this.brand = brand;
        this.year = year;
        this.color = color;
    }
    
    public Car(String id, String brand, int year, String color, int price, boolean sold) {
        this.id = id;
        this.brand = brand;
        this.year = year;
        this.color = color;
        this.price = price;
        this.sold = sold;
    }

    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }

    public String getBrand() {
        return brand;
    }
    public void setBrand(String brand) {
        this.brand = brand;
    }

    public int getYear() {
        return year;
    }
    public void setYear(int year) {
        this.year = year;
    }

    public String getColor() {
        return color;
    }
    public void setColor(String color) {
        this.color = color;
    }

    public int getPrice() {
        return price;
    }
    public void setPrice(int price) {
        this.price = price;
    }

    public boolean isSold() {
        return sold;
    }
    public void setSold(boolean sold) {
        this.sold = sold;
    }

    @Override
    public int hashCode() {
        int hash = 7;
        hash = 59 * hash + (this.id != null ? this.id.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final Car other = (Car) obj;
        if ((this.id == null) ? (other.id != null) : !this.id.equals(other.id)) {
            return false;
        }
        return true;
    }
}