import java.util.*;
import java.awt.*;

/**
   An OilBlob is a blob of oil.  It drifts around the world and consumes
   Fish and Algae.
   @author Ben Dugan, Hal Perkins
   CSE 142 Summer 2001, Homework 6
*/
public class OilBlob implements Thing {
  private static Random rand = new Random();
  private int x, y;

  /** Create a new oil blob at the given location. */
  public OilBlob(int x, int y) {
    this.x = x;
    this.y = y;
  }
  
  /** Display the oil blob (a black oval) onto the graphics window. */
  public void display(GWindow g) {
    g.display(new Oval(this.x, this.y, 6, 6, Color.black, true));
  }

  /** Oil blobs move more or less at random.  */
  public void move() {
    int dx = rand.nextInt(7) - 3;
    int dy = rand.nextInt(7) - 3;
    this.x = this.x + dx;
    this.y = this.y + dy;
  }

  /** Oil blobs consume Algae and Fish. */
  public boolean consumes(String kindOfThing) {
    return kindOfThing.equals("Algae") || kindOfThing.equals("Fish");
  }

  /** OilBlob doesn't do anything interesting when it consumes things. */
  public void consume(String kindOfThing) {}

  /** Answer "OilBlob". */
  public String kindOfThing() { return "OilBlob"; }

  /** OilBlobs don't spawn (luckily). */
  public void spawn(ArrayList c) {}

  /** Answer the x position. */
  public int getX() { return this.x; }

  /** Answer the y position. */
  public int getY() { return this.y; }

  /** Answer the name and location. */
  public String toString() {
    return "OilBlob: (" + this.x + "," + this.y + ")";
  }
}