import java.awt.*;
import java.net.*;
import java.util.*;
import java.io.*;

/**
* A class that uses a MediaTracker to load pictures given via the methods add(). Usage in
an applet-security-environment assumed.
* @author Torbjörn Nilsson
* @version 1.0
*/
public class ImageLoader {
  MediaTracker mt;
  
  static String castleURL = "http://www.lysator.liu.se/~nexus/FOD/PICS/fortress.jpg";  //test
  static String mapURL = "http://www.lysator.liu.se/~nexus/FOD/PICS/map4.jpg";  //test
  Toolkit tk = Toolkit.getDefaultToolkit();
  String[] urls;
  Frame fr;
  String host;

/**
 * Give the name of a host, so every picture URL can be transformed into a new URL with
 that host as address of the server.
*/
  public ImageLoader(String hostname) {
    super();
    fr = new Frame();
    mt = new MediaTracker(fr);
    host = hostname;
  }

/**
 * Add the given URL to list of pics this ImageLoader should try loading. Convert WWW-server
name of URL to the host given in the contructor.
*/
  public Image add(String url) {
    Image im = null;

//    System.out.println(url+"\n"+host);
    url = "http://" + host + url.substring(url.indexOf("se/")+2);
    System.out.println(url);

    try {
      im = tk.getImage(new URL(url));
    }
    catch(MalformedURLException e) {System.out.println("ERROR! "+e);}
    mt.addImage(im,0);
    System.out.println(im);
    return im;
  }

/**
* Wait for all images added with add() to be loaded, then return call.
*/
  public void loadAllImages() {

//while()
//image.getWidth(null)  check if -1 is returned   --- for all pics
// sleep()

    try {mt.waitForAll();} catch (InterruptedException e){}
  }


/*

 * Get an image objext and start the downloading

  public static synchronized Image loadFullImage(String url, Component comp) {
    Image im = null;
    try {
      im = tk.getImage(new URL(url));
    }
    catch(MalformedURLException e) {System.out.println("ERROR! "+e);}

    mt.addImage(im,0);
    try mt.waitForAll(); catch (InterruptedException e);

    return im;
  }

*/  

/**
 * For test purposes.
*/
  public static void main(String[] a) {
    try {
      
      ImageLoader imlo = new ImageLoader(InetAddress.getLocalHost().getHostName());
      Image im = imlo.add(castleURL);
      Image im2 = imlo.add(mapURL);
      imlo.loadAllImages();
      
      System.out.println("hej");
      
      Frame f = new Frame("MediaTrackern");
      f.setLayout(new BorderLayout());
      f.resize(300,300);
      f.add("Center", new BkgPanel(im));
      
      Frame ff = new Frame("MediaTrackern");
      ff.setLayout(new BorderLayout());
      ff.resize(300,300);
      ff.add("Center", new BkgPanel(im2));
      
      f.show();
      ff.show();
    }
    catch (Exception e) {
      System.out.println("Fel..."+e);
    }
    


  }


}