import java.applet.Applet;
import java.awt.*;
import java.awt.image.*;
import java.io.*;
import java.net.*;
import java.util.StringTokenizer;

public class SlideViewer extends Applet implements Runnable{

  Panel fileloader = new Panel();
  Button startButton, stopButton;
  TextField slideshowname;
  Thread slidethread;
  Screen slidescreen;
  Slide SShow = new Slide(createImage(1,1), 0);
  Slide inView = SShow;

  public void init() {
    p("Running Slideviewer...");
    stop();
    String defaultSlideshow = getParameter("Default");
    fileloader = new Panel();
    slideshowname = new TextField(defaultSlideshow);
    startButton = new Button ("Start!");
    slidescreen = new Screen();
    setLayout(new GridLayout(1,1));
    this.add(slidescreen);
    setBackground(Color.black);
    setForeground(Color.black);
    //    this.add(fileloader);
    slidescreen.repaint();
    loadSlideShow(slideshowname.getText());
  }
  

  public void run() {
    p("Slidemonitor running");
    while (inView != null) {
      System.out.print("Showing image: "+inView.img);
      slidescreen.showImage(inView.img);
      try {
	p(" for "+inView.delay+" ms");
	Thread.sleep(inView.delay);
      }
      catch (Exception x) {
	p(x);
      }
      inView = inView.next;
    }
    stop();
  }
  
  public void start() {
    slidethread = new Thread(this, "foo");
  }

  public void stop() {
    slidethread = null;
  }

  public boolean mouseUp (Event e, int x, int y) {
    if (e.target instanceof Screen) {
      inView = SShow.next;
      start();
      slidethread.start();
    }
    return true;
  }

  public boolean action (Event e, Object arg) {
    if ((e.target instanceof TextField) || (e.target instanceof Button)) {
      loadSlideShow(slideshowname.getText());
      inView = SShow.next;
      start();
      slidethread.start();
    }
    return true;
  }

  private InputStream getSlideShow(String showname) {
    InputStream ss = null;
    //    p("Loading slideshow: "+showname);
    //    try {
    //ss = (new URL(showname)).openStream();
    //}
    //catch (Exception e) {
    //p(e);
    //p("Cannot read file: "+showname);
      p("Loading: "+getCodeBase()+showname);
      try {
	ss = (new URL(getCodeBase()+showname)).openStream();
      }
      catch (Exception x) {
	p(x);
      }
      //    }
    return ss;
  }

  public void loadSlideShow(String showname) {
    String next = "dummyvalue";
    SShow.img = createImage(1,1);
    Slide currSlide = SShow;
    String im;

    try {
      DataInputStream ds = new DataInputStream(getSlideShow(showname));
      while ((next = ds.readLine()) != null) {
	//	p("LINE: "+next);
	if (next != "") {
	  StringTokenizer st = new StringTokenizer(next, " \t");
	  currSlide.next = new Slide(loadImage(st.nextToken()), 
				     Integer.parseInt(st.nextToken()));
	  currSlide = currSlide.next;
	}
      }
    }
    catch (Exception e) {
      //      p(e);
    }
  }
  
  public Image loadImage(String newImagename) {
    Image canv = null;
    //    try{
    p("Loading image: "+newImagename);
    //  canv = getImage(new URL(newImagename));
    //}
    //catch (Exception e) {
    //p(e);
    //p("Trying alternate: "+getCodeBase()+newImagename);
    try {
      canv = getImage(new URL(getCodeBase(),newImagename));
    }
      
    catch (Exception x){
      p(x);
      //}
    }

    MediaTracker mt = new MediaTracker(this);
    mt.addImage(canv, 0);
    try{
      mt.waitForID(0);
    }
    catch (Exception e){
      System.out.println(e);
    }
      return canv;
  }


  private void p(String s) {
    System.out.println(s);
  }
  
  private void p(Exception e) {
    System.out.println(e);
  }
  
}