import java.awt.*; // use graphics

// This Sprite is a Buggle that moves along the x-axis and turns around when reaching sides of frame.
public class RightLeftBuggle extends Sprite {
  
  // Instance variables
  
  // variables to keep track of initial state of Buggle
  // make protected to allow extended classes to have access
  protected Color c;     // color of Buggle
  protected int size;   // size of Buggle
  protected int startX; // initial x-coordinate of Buggle
  protected int y;      // y-coordinate of Buggle (never changes)
  protected int dx;     // distance Buggle moves in each frame
  protected boolean startRight; // direction Buggle initially facing
  
  // variables to keep track of current state of Buggles
  protected int currentX; // current x-coordinate of Buggle
  protected boolean headedRight; // current direction Buggle is facing

  // Constructors  
  public RightLeftBuggle () {
    this.c = Color.red;
    this.size = 40;
    this.startX = 0;
    this.y = 0;
    this.dx = 5;
    this.startRight = true;
    this.resetState();
  }
  
  public RightLeftBuggle (Color c, int size, int startX, int y, int dx) {
    this.c = c;
    this.size = size;
    this.startX = startX;
    this.y = y;
    if (dx>0) { // facing right
      startRight=true;
    } else {
      startRight=false;
    }
    this.dx = Math.abs(dx);
    this.resetState();
  }

  // Required Sprite methods  
  protected void drawState (Graphics g) {
    Polygon p = new Polygon();
    p.addPoint(currentX, y);
    if (headedRight) {
      p.addPoint(currentX+size, y+size/2);
    } else {
      p.addPoint(currentX-size, y+size/2);
    }
    p.addPoint(currentX, y+size);
    p.addPoint(currentX, y);
    g.setColor(c);
    g.fillPolygon(p);
    g.setColor(Color.black);
    g.drawPolygon(p);
  }
  
  protected void updateState () {
    if (headedRight) {
      currentX = currentX + dx;
      if ((currentX+size)>this.width) { // turn LEFT
        headedRight = false;
      }
    } else { // must be headed left
      currentX = currentX - dx;
      if ((currentX-size)<0) { // turn RIGHT
        headedRight = true;
      }
    }  
  }
  
  protected void resetState () {
    currentX = startX;
    headedRight = startRight;
  }

  // For Debugging  
  public String className () {
    return "RightLeftBuggle";
  }
  
  public String toString () {
    return className() + ":" + getName()
    + "[bounds=("+this.width+","+this.height+")"
                  + "[color="+c
                  + "; size="+size
                  + "; startX="+startX
                  + "; startY="+y
                  + "; dx="+dx
                  + "; startRight="+startRight
                  + "]";
  }
  
  public String getState () {
    return className() + ":" + getName()
    + "[bounds=("+this.width+","+this.height+")"
                  + "[currentX="+currentX
                  + "; headedRight="+headedRight
                  + "]";
  }
  
}