import java.util.Random;

public class EntityWithRollers<T extends EntityArtillery, U extends IDrawingRollers> {
    static Random rnd = new Random();
    private final Object[] entities;
    public int entitiesCount = 0;
    private final Object[] rollers;
    public int rollersCount = 0;

    public EntityWithRollers(int count) {
        entities = new Object[count];
        rollers = new Object[count];
    }

    public boolean add(EntityArtillery entity) {
        if (entitiesCount >= entities.length) {
            return false;
        }
        entities[entitiesCount++] = entity;
        return true;
    }

    public boolean add(IDrawingRollers roller) {
        if (rollersCount >= rollers.length) {
            return false;
        }
        rollers[rollersCount++] = roller;
        return true;
    }

    public IDrawingObject constructArtillery() {
        if (entitiesCount == 0 || rollersCount == 0) {
            return null;
        }
        EntityArtillery entity = (EntityArtillery) entities[rnd.nextInt(0, entitiesCount)];
        IDrawingRollers roller = (IDrawingRollers) rollers[rnd.nextInt(0, rollersCount)];

        if (entity instanceof EntityAdvancedArtillery advancedEntity) {
            return new DrawingObjectArtillery(new DrawingAdvancedArtillery(advancedEntity, roller));
        }
        return new DrawingObjectArtillery(new DrawingArtillery(entity, roller));
    }
}