public abstract class Enemy implements Character {

    private final String name;
    private int hitPoints;

    protected Enemy(String name, int hitPoints) {
        if (name == null || name.isBlank()) {
            throw new IllegalArgumentException(
                    "Name must not be blank"
            );
        }

        if (hitPoints <= 0) {
            throw new IllegalArgumentException(
                    "Hit points must be positive"
            );
        }

        this.name = name;
        this.hitPoints = hitPoints;
    }

    @Override
    public final String getName() {
        return name;
    }

    @Override
    public final int getHitPoints() {
        return hitPoints;
    }

    @Override
    public final boolean isDefeated() {
        return hitPoints == 0;
    }

    protected final void takeDamage(int damage) {
        if (damage < 0) {
            throw new IllegalArgumentException(
                    "Damage must not be negative"
            );
        }

        hitPoints = Math.max(
                0,
                hitPoints - damage
        );
    }

    @Override
    public final String toString() {
        return "%s{name='%s', hitPoints=%d, defeated=%s}"
                .formatted(
                        getClass().getSimpleName(),
                        name,
                        hitPoints,
                        isDefeated()
                );
    }
}