import java.util.Random;

public class EntityWithExtraCreator <T extends EntityLocomotive, U extends IDrawningExtra> {
    private T[] entityArr;
    private U[] extraArr;

    int entitiesCount = 0;
    int extraCount = 0;

    public EntityWithExtraCreator(int countEntities, int countExtra) {
        entityArr = (T[]) new Object[countEntities];
        extraArr = (U[]) new Object[countExtra];
    }

    public int Insert(T entityLocomotive) {
        if(entitiesCount < entityArr.length) {
            entityArr[entitiesCount] = entityLocomotive;
            entitiesCount++;
            return entitiesCount - 1;
        }
        return -1;
    }

    public int Insert (U extra) {
        if(extraCount < extraArr.length) {
            extraArr[extraCount] = extra;
            extraCount++;
            return extraCount - 1;
        }
        return -1;
    }

    public DrawningLocomotive getEntityWithExtra() {
        Random random = new Random();
        int getEntityRandomIndex = random.nextInt(entityArr.length);
        int getExtraRandomIndex = random.nextInt(extraArr.length);

        T locomotive = entityArr[getEntityRandomIndex];
        U extra = extraArr[getExtraRandomIndex];

        if (locomotive instanceof EntityWarmlyLocomotive) {
            return  new DrawningWarmlyLocomotive(locomotive, extra);
        }
        return new DrawningLocomotive(locomotive, extra);
    }

}