package oving7.train;

/**
 * The class {@code TrainCar} represents a simple and general train car.
 */
public class TrainCar {

    private int deadWeight;

    /**
     * Constructor for a train car.
     * 
     * @param deadWeight the weight of an empty train car
     * @throws IllegalArgumentException if deadWeight is negative
     * 
     * @see TrainCarTest#testDeadWeight()
     */
    public TrainCar(int deadWeight) {
	if (deadWeight < 0) {
	    throw new IllegalArgumentException("dead weight cannot be less than zero");
	}
	this.deadWeight = deadWeight;
    }

    /**
     * @param deadWeight the weight of an empty train car. In other words, the weight of only the
     *        carriage, without passengers and cargo
     * @throws IllegalArgumentException if deadWeight is negative
     * 
     * @see TrainCarTest#testDeadWeight()
     */
    public void setDeadWeight(int deadWeight) {
	if (deadWeight < 0) {
	    throw new IllegalArgumentException("dead weight cannot be less than zero");
	}
	this.deadWeight = deadWeight;
    }

    /**
     * @return the weight of an empty train car. In other words, the weight of only the carriage,
     *         without passengers and cargo
     * 
     * @see TrainCarTest#testDeadWeight()
     */
    public int getDeadWeight() {
        return deadWeight;
    }

    /**
     * @return the total weight of the train car. Note that this method should also be callable on
     *         subclasses and still return the total weight of the train car (keyword:
     *         redefinition).
     * 
     * @see TrainCarTest#testDeadWeight()
     */
    public int getTotalWeight() {
        return deadWeight;
    }

    /**
     * @return a string representation of the train car. The string should contain the type of the
     *         train car and the total weight of the train car. For {@link PassengerCar}, the number
     *         of passengers should also be included. For {@link CargoCar}, the weight of the cargo
     *         should also be included.
     */
    @Override
    public String toString() {
        return "TrainCar";
    }

    public static void main(String[] args) {

    }
}