import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;

import com.genuts.gameui.*;

/**
 * Display moving balls and scrolling playfield with all tiles of the example. <br>
 * A special wrapper follow the selected ball. <br>
 * The size of each tile is automaticaly computed.
 */
public class FollowPathFinder extends Applet implements MouseListener {
  private PlayField playfield = null;

  private Sprite currentSprite;

  private Image ballImage = null;
  private Image redBallImage = null;

  public void init() {
    setLayout(null);

    // Loading images
    ballImage = getImage(getClass().getResource("anim-split.gif"));
    redBallImage = getImage(getClass().getResource("anim-split-red.gif"));
    Image tileImage = getImage(getClass().getResource("tile.gif"));
    MediaTracker tracker = new MediaTracker(this);
    tracker.addImage(ballImage, 0);
    tracker.addImage(redBallImage, 0);
    tracker.addImage(tileImage, 0);
    try {
      tracker.waitForID(0);
    } catch (InterruptedException e) {
      System.out.println("Loading interrupted");
    }

    // Gets the size of a tile
    Tiles.tileSize = tileImage.getWidth(null);

    // Creates the playfield
    SpriteCollisionManager collisionManager = new SpriteCollisionManager(10);
    playfield = new PlayField(collisionManager,
			      10*Tiles.tileSize,
			      5*Tiles.tileSize);
    playfield.setPreferredSize(Tiles.tiles[0].length*Tiles.tileSize,
			       Tiles.tiles.length*Tiles.tileSize);
    playfield.setBackground(Color.white);

    // Disposes tiles from class Tiles
    for (int y = 0; y < Tiles.tiles.length; y++) {
      for (int x = 0; x < Tiles.tiles[y].length; x++) {
	if (Tiles.tiles[y][x]) {
	  Sprite tile = new Sprite(tileImage);
	  tile.setPosition(x*Tiles.tileSize, y*Tiles.tileSize);
	  playfield.addSprite(tile);
	}
      }
    }

    // Disposes 20 balls
    for (int cpt = 0; cpt < 19; cpt++) {
      AnimatedSprite anim = new AnimatedSprite(ballImage, 8, 1, 2);
      anim.setCurrentPictureNumber((int) (Math.random()*8));
      MovingBall moving = new MovingBall(anim, 1, 1);
      if ((int) (Math.random()*2) == 0) {
	moving.setClockWise(false);
      }
      playfield.addSprite(moving);
      while (!moving.setPosition((int) (Math.random()*playfield.getPreferredWidth()), 
				 (int) (Math.random()*playfield.getPreferredHeight())));
    }

    // Adds a ball with the follow wrapper
    AnimatedSprite anim = new AnimatedSprite(redBallImage, 8, 1, 2);
    anim.setCurrentPictureNumber((int) (Math.random()*8));
    MovingBall moving = new MovingBall(new FollowWrapper(anim), 1, 1);
    if ((int) (Math.random()*2) == 0) {
      moving.setClockWise(false);
    }
    playfield.addSprite(moving);
    while (!moving.setPosition((int) (Math.random()*playfield.getPreferredWidth()), 
			       (int) (Math.random()*playfield.getPreferredHeight())));
    currentSprite = moving;

    // Displays the playfield
    add(playfield);

    setSize(10*Tiles.tileSize,
	    5*Tiles.tileSize);

    // Adds mouse listeners
    playfield.addMouseListener(this);
  }

  public void start() {
    // Activate the playfield
    playfield.setPause(false);
  }

  public void stop() {
    if (playfield != null) {
      playfield.stop();
    }
  }

  ////////////////////////////////////////////////////
  /////////  MouseListener  //////////////////////////
  ////////////////////////////////////////////////////
  public void mouseClicked(MouseEvent e) {
  }

  public void mousePressed(MouseEvent e) {
    Sprite sprite = ((SpriteCollisionManager) playfield.getCollisionManager()).getSpriteAt(playfield.getXOffset() + e.getX(), playfield.getYOffset() + e.getY());
    if ((sprite != null) && (sprite != currentSprite)) {
      Sprite actionSprite = sprite.getFinalActionSprite();
      if (actionSprite instanceof AnimatedSprite) {
	playfield.removeSprite(currentSprite);
	playfield.removeSprite(sprite);

	FollowWrapper followWrapper = (FollowWrapper) currentSprite.getActionSprite();
	((SpriteWrapper) currentSprite).setActionSprite(followWrapper.getActionSprite());
	((AnimatedSprite) currentSprite.getFinalActionSprite()).setSequence(ballImage, 8, 1);

	((SpriteWrapper) followWrapper).setActionSprite(sprite.getActionSprite());
	((SpriteWrapper) sprite).setActionSprite(followWrapper);
	((AnimatedSprite) actionSprite).setSequence(redBallImage, 8, 1);
	
	playfield.addSprite(currentSprite);
	playfield.addSprite(sprite);

	currentSprite = sprite;
      }
    }
  }

  public void mouseReleased(MouseEvent e) {
  }

  public void mouseEntered(MouseEvent e) {
  }

  public void mouseExited(MouseEvent e) {
  }
}