import structure.*;
import java.util.*;

/**
 * This class represents one creature on the board.
 * Each creature must remember its species, position, direction,
 * and the world in which it is living.
 * <p>
 * In addition, the Creature must remember the next instruction
 * out of its program to execute.
 * <p>
 * The creature is also repsonsible for making itself appear in
 * the WorldMap.  In fact, you should only update the WorldMap from
 * inside the Creature class.  
 */

public class Creature {
    /**
     * Create a creature of the given species, with the indicated
     * position and direction.  Note that we also pass in the 
     * world-- remember this world, so that you can check what
     * is in front of the creature and to update the board
     * when the creature moves.
     */
    public Creature(Species species,
		    World world,
		    Position pos,
		    int dir) {
    }

    /**
     * Return the species of the creature.
     */
    public Species species() {
	Assert.fail("Implement me.");
	return null;
    }

    /**
     * Return the current direction of the creature.
     */
    public int direction() {
	Assert.fail("Implement me.");
	return 0;
    }

    /**
     * Return the position of the creature.
     */
    public Position position() {
	Assert.fail("Implement me.");
	return null;
    }

    /**
     * Execute steps from the Creature's program until 
     * a hop, left, right, or infect instruction is executed.
     */
    public void takeOneTurn() {
    }

    /**
     * Return the compass direction the is 90 degrees left of
     * the one passed in.
     */
    public static int leftFrom(int direction) {
	Assert.pre(0 <= direction && direction < 4, "Bad direction");
	return (4 + direction - 1) % 4;
    }

    /**
     * Return the compass direction the is 90 degrees right of
     * the one passed in.
     */
    public static int rightFrom(int direction) {
	Assert.pre(0 <= direction && direction < 4, "Bad direction");
	return (direction + 1) % 4;
    }

    /**
     */
    public static void main(String st[]) {

	// test creature code here.

    }


}