import java.util.Random;
/**
 * Write a description of class Die here.
 *
 * @author (your name)
 * @version (a version number or a date)
 */
public class Die implements DieInterface
{
    private static Random randomiser;
    private Integer value; // null if unrolled
    public Die()
    {
        value = 0;
        if(!(randomiser instanceof Random)){
            randomiser = new Random();
        }
    }

    public boolean hasRolled(){
        if(value != 0){
            return true;
        }
        else{
            return false;
        }
    }

    public void roll(){
        value = randomiser.nextInt(NUMBER_OF_SIDES_ON_DIE) + 1;
    }

    public int getValue()throws NotRolledYetException{
        if(hasRolled()){
            return value;
        }
        else{
            throw new NotRolledYetException("You haven't rolled the DIE");
        }

    }

    public void setValue(int value){
         if(1 <= value && value <= NUMBER_OF_SIDES_ON_DIE){
             this.value = value;
         }
         else{
             this.value = 0;
         }
    }

    public void clear(){
        value = 0;
    }

    public void setSeed(long seed){
        randomiser.setSeed(seed);
    }
}