package aima.agents;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class GridComponent extends Component implements ActionListener {
  protected int width, height; 
  protected GridApplet frame;
  protected GridEnvironment environment;

  /** This constructor requires a Frame and a desired size */
  public GridComponent(GridApplet frame, GridEnvironment env, int width, int height) {
    this.frame = frame;
    this.environment = env;
    this.width = width;
    this.height = height;
    enableEvents(AWTEvent.MOUSE_MOTION_EVENT_MASK);
  }

  public Dimension getPreferredSize() { return new Dimension(width, height); }
  
  int boxSize = 30, minBoxSize = 20;

  /** Draw the grid lines, and stuff inside. */
  public void paint(Graphics g) {
    int xSize = environment.xSize, ySize = environment.ySize;
    // Draw the grid lines
    int xWin = this.getSize().width, yWin = this.getSize().height;
    boxSize = java.lang.Math.max(minBoxSize, java.lang.Math.min(xWin/xSize, yWin/ySize));
    for(int i = 0; i <= xSize; i++) {
      g.drawLine(i*boxSize, 0, i*boxSize, ySize*boxSize);
      g.drawLine(0, i*boxSize,  xSize*boxSize, i*boxSize);
    }
    Vector objs = environment.objects;
    for (int i = 0; i < objs.size(); i++) {
      Thing obj = (Thing)objs.elementAt(i);
      Point p = obj.location;
      if (p != null) {
        if (obj instanceof Dirt) g.fillOval(p.x * boxSize + 5, p.y * boxSize + 5, 10, 10);
        if (obj instanceof AgentThing) {
          g.setColor(Color.blue);
          g.fillRect(p.x * boxSize + 3, p.y * boxSize + 3, 14, 14);
          g.drawLine(p.x*boxSize+10, p.y*boxSize+10, 
                     p.x*boxSize+10 + obj.heading.x*12, p.y*boxSize+10 + obj.heading.y*12);
          g.setColor(Color.black);
        }
        if (obj instanceof Wall) {
          g.setColor(Color.gray);
          g.fillRect(p.x * boxSize + 1, p.y * boxSize + 1, 18, 18);
          g.setColor(Color.black);
        }
      }
    }
  }

  public void actionPerformed(ActionEvent event) {
    System.out.println("GridComponent sees " + event);
  }
  
  /** When the mouse moves, display where we are. */
  public void processMouseMotionEvent(MouseEvent e) {
   frame.cellLabel.setText(e.getX()/boxSize + "," + e.getY()/boxSize);
   super.processMouseMotionEvent(e);  // Important!
  }

}