//GDj NCAR/MMM 9/6/01
/***********************************************************************
 * This is a java applet whose purpose is to load radar images upon user
 * request.  It is to be used on the ABFM web page and will eliminate
 * the need to constantly be clicking back and clicking on the next
 * image on ones web browser.  The AWT was used due to the fact that
 * users must download a plugin to interact with Swing applets.
 ***********************************************************************/
import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
import java.applet.*;
import java.io.*;
import java.net.*;
import java.lang.Number.*;
import java.util.StringTokenizer;

public class LoadPics extends Applet implements ItemListener, ActionListener,
                        Runnable {

   static Image img;
   //ImageController remoteControl;
   static URL theURL;
   static URL myURL;
   static BufferedReader data;
   static List img_lst;
   static String curr_date;
   static String[] filenames;
   static Panel controls;
   static Panel imagePane;
   static Panel imageNamesPane;
   static Button play;
   static Button stop;
   static Button faster;
   static Button slower;
   static Button backOne;
   static Button forwardOne;
   static Button reset;
   static String sepChar;

   public void init() {

     //curr_date = getParameter("dateToDisplay");

     String urlArgs = getDocumentBase().toString();
     int begIndex = urlArgs.indexOf("=");
     begIndex++;
     curr_date = urlArgs.substring(begIndex);


     // get file separator to descend into subdirectories
     //sepChar = System.getProperty("file.separator");
     sepChar = "/";
     setBackground(Color.white);

     // get filename containing radar image dates
     try {
       this.theURL = new URL(getCodeBase(), "tmp");
     }
     catch (MalformedURLException e) {
       System.out.println("Bad URL: " + theURL);
     }

     int select = -1;
     // create a list and read in the dates to the list
     img_lst = new List(20, true);
     try {
       InputStream in = theURL.openStream();
       data = new BufferedReader(new InputStreamReader(in));
       String line;
       img_lst.add("Choose The Desired Date");
       int i = 1;
       while ((line = data.readLine()) != null) {

           img_lst.add(line);
           if (line.equals(curr_date))
             select = i;
           i++;
       }
     }
     catch (IOException e) {}

     setLayout(new BorderLayout());
     img_lst.addItemListener(this);
     add(img_lst, "East");
     controls = new Panel(new FlowLayout());
     play = new Button("Play");
     play.setBackground(Color.white);
     stop = new Button("Stop");
     stop.setBackground(Color.white);
     faster = new Button("Faster");
     faster.setBackground(Color.white);
     slower = new Button("Slower");
     slower.setBackground(Color.white);
     forwardOne = new Button("Forward One");
     forwardOne.setBackground(Color.white);
     backOne = new Button("Back One");
     backOne.setBackground(Color.white);
     reset = new Button("Reset Speed");
     reset.setBackground(Color.white);
     play.addActionListener(this);
     stop.addActionListener(this);
     faster.addActionListener(this);
     slower.addActionListener(this);
     forwardOne.addActionListener(this);
     backOne.addActionListener(this);
     reset.addActionListener(this);
     controls.add(play);
     controls.add(stop);
     controls.add(faster);
     controls.add(slower);
     controls.add(backOne);
     controls.add(forwardOne);
     controls.add(reset);
     controls.setBackground(Color.blue);
     add(controls, "North");

     //imagePane = new Panel(new FlowLayout());
     //add(imagePane, "Center");

     if (select > -1) {
       BufferedReader data1;
       String urlstr = curr_date;
       try {
         this.myURL = new URL(getCodeBase(), urlstr);
       }
       catch (MalformedURLException event) {
         System.out.println("Bad URL: " + myURL);
       }
       img_lst.removeAll();
       try {
         InputStream in = myURL.openStream();
         data1 = new BufferedReader(new InputStreamReader(in));

         img_lst.add("Choose Another Date");
         //img_lst.add("4km Layer Only");
         //img_lst.add("7km Layer Only");
         //img_lst.add("10km Layer Only");
         String line;
         while ((line = data1.readLine()) != null) {
           StringTokenizer st = new StringTokenizer(line, "<");
           int fake_picture = 0;
           while (st.hasMoreTokens()) {
             String currToken = st.nextToken();
             int end_index;
             if (((end_index = currToken.indexOf(".jpg")) != -1) ||
                ((end_index = currToken.indexOf(".jpeg")) != -1) ||
                ((end_index = currToken.indexOf(".gif")) != -1)) {
               if (fake_picture != 0) {
                 img_lst.add(currToken.substring(8,end_index+4));
               }
               else
                 fake_picture++;
             }
           }
         }

       } catch (IOException exc) {}

     }

   }

   // make the controls for image animation
   public void makeControls() {
/*     controls = new Panel(new FlowLayout());
     play = new Button("Play");
     play.addActionListener(this);
     stop = new Button("Stop");
     stop.addActionListener(this);
     controls.add(play);
     controls.add(stop);
     add(controls, "South");   */
   }

   public void actionPerformed (ActionEvent acevt) {

     String comm = acevt.getActionCommand();
     // start animation if play is pushed
       if (comm.equalsIgnoreCase("play")) {
       int[] i = img_lst.getSelectedIndexes();
       if (i.length == 0)
         filenames = img_lst.getItems();
       else
         filenames = img_lst.getSelectedItems();
       //filenames = img_lst.getItems();
       startLoop();
//       remoteControl = new ImageController (filenames, curr_date);

     }

     // speed up animation if faster is pushed
     else if (comm.equalsIgnoreCase("faster")) {
       if (speed > 50)
         speed -= 50;
     }

     // slow down animation if slower is pushed
     else if (comm.equalsIgnoreCase("slower")) {
       if (speed < 1500)
         speed += 50;
     }

     // forward one image
     else if (comm.equalsIgnoreCase("forward one")) {
       if (imgIndex >= (layerImages.length - 1)) {
         imgIndex = 0;
         img = layerImages[imgIndex];
       }
       else {
         imgIndex++;
         img = layerImages[imgIndex];
       }
       repaint();
     }

     // back one image
     else if (comm.equalsIgnoreCase("back one")) {
       if (imgIndex == 0) {
         imgIndex = layerImages.length - 1;
         img = layerImages[imgIndex];
       }
       else {
         imgIndex--;
         img = layerImages[imgIndex];
       }
       repaint();
     }

     // reset the speed of the animation
     else if (comm.equalsIgnoreCase("reset speed"))
       speed = 500;

     else
       stop();
   }

   // draw the image on the window
   public void paint(Graphics g) {
//   public void paint(imagePane.getGraphics(this)) {
      int iwidth = img.getWidth(this);
      int iheight = img.getHeight(this);
      Double d = new Double(iwidth*.8);
      int crop_width = d.intValue();
      d = new Double(iheight*.8);
      int crop_height = d.intValue();

      //g = imagePane.getGraphics();
      g.drawImage(img, 0, 30, iwidth, iheight, Color.white, this);

   }

   // over-riding the update method prevents flickering
   public void update(Graphics g) {
     paint(g);
   }

   // when selection is made do appropriate thing
   public void itemStateChanged(ItemEvent e) {
     String index = (e.getItem()).toString();
     String selection = img_lst.getItem(Integer.parseInt(index));

     if (selection.equalsIgnoreCase("all layers"))
       selection = curr_date;

         // if selection is an image, load the image
     if ((selection.indexOf(".jpg") != -1) ||
                (selection.indexOf(".jpeg") != -1) ||
                (selection.indexOf(".gif") != -1)) {
       loadImage();
     }

     // if selection is to choose another date, load in the dates file
     else if (selection.equalsIgnoreCase("choose another date")) {

       img_lst.removeAll();
       BufferedReader data2;
       try {
         InputStream in = theURL.openStream();
         data2 = new BufferedReader(new InputStreamReader(in));
         String line;
         while ((line = data2.readLine()) != null)
           img_lst.add(line);
       } catch (IOException eve) {}
     }

     // ignore if selection = "Choose The Desired Date"
     else if (selection.equalsIgnoreCase("choose the desired date")) {
     }

     // if selection equals specific layer, only show that layer
     else if (selection.equalsIgnoreCase("4km layer only") ||
        selection.equalsIgnoreCase("7km layer only") ||
        selection.equalsIgnoreCase("10km layer only")) {

       String layer;
       char layer_char = selection.charAt(0);
       if (layer_char == '1')
         layer = "_10.";
       else if (layer_char == '4')
         layer = "_04.";
       else
         layer = "_07.";

       String[] allImages = img_lst.getItems();
       img_lst.removeAll();

       //img_lst.add("Choose Another Date");
       img_lst.add("All Layers");

       // check the list for the specified layer and display appropriately
       for (int currImage = 0; currImage < allImages.length; currImage++) {

         if (allImages[currImage].indexOf(layer) != -1)
           img_lst.add(allImages[currImage]);
       }

       makeControls();

     }


     // else, load image names to list
     else {
       curr_date = selection;
       BufferedReader data1;
       String urlstr = selection;
       try {
         this.myURL = new URL(getCodeBase(), urlstr);
       }
       catch (MalformedURLException event) {
         System.out.println("Bad URL: " + myURL);
       }
       img_lst.removeAll();
       try {
       InputStream in = myURL.openStream();
       data1 = new BufferedReader(new InputStreamReader(in));

       // add line that allows you to change date
       img_lst.add("Choose Another Date");
       //img_lst.add("4km Layer Only");
       //img_lst.add("7km Layer Only");
       //img_lst.add("10km Layer Only");
       String line;
       while ((line = data1.readLine()) != null) {
         StringTokenizer st = new StringTokenizer(line, "<");
         int fake_picture = 0;
         while (st.hasMoreTokens()) {
           String currToken = st.nextToken();
           int end_index;
           if (((end_index = currToken.indexOf(".jpg")) != -1) ||
                ((end_index = currToken.indexOf(".jpeg")) != -1) ||
                ((end_index = currToken.indexOf(".gif")) != -1)) {
             if (fake_picture != 0) {
               img_lst.add(currToken.substring(8,end_index+4));
//               img_lst.add(line);
             }
             else
               fake_picture++;
           }
         }
       }

     } catch (IOException exc) {}

     }

     repaint();
   }

   // load and display the appropriate image
   public void loadImage() {
     String img_loc = curr_date + sepChar + img_lst.getSelectedItem();
     img = getImage(getCodeBase(), img_loc);
     //CropImageFilter crop_filter = new CropImageFilter(40,130,510,800);
     //img = createImage(new FilteredImageSource(img.getSource(), crop_filter));
   }


   /**The class ImageController creates the buttons used to start
    * and stop image animation.
   class ImageController implements Runnable {
*/
     Thread radarSim;
     String[] imageFiles;
     String date;
     Image[] layerImages;
     Image currentImg;
     int speed;
     int imgIndex;

 /*    ImageController (String[] filenames, String d) {

       imageFiles = filenames;
       date = d;
       layerImages = new Image[imageFiles.length];
     }
*/
     public void startLoop() {
       speed = 400;
       imageFiles = filenames;
       date = curr_date;

       if (radarSim == null) {
         radarSim = new Thread(this);
         radarSim.start();
       }
     }

     public void stop() {

       if (radarSim != null) {
         radarSim.stop();
         radarSim = null;
       }
     }

     public void run() {
       layerImages = new Image[imageFiles.length];
       while (true) {

         for (int i = 0; i < imageFiles.length; i++) {
           String img_path = date + sepChar + imageFiles[i];
           layerImages[i] = getImage(getCodeBase(), img_path);
           //CropImageFilter crop_filter = new CropImageFilter(40,130,500,800);
           //layerImages[i] = createImage(new FilteredImageSource(layerImages[i].getSource(), crop_filter));
         }

         for (imgIndex = 0; imgIndex < imageFiles.length; imgIndex++) {
       img = layerImages[imgIndex];
           repaint();
           pause(speed);
         }
       }
     }

     public void pause (int time) {

       try { Thread.sleep(time); }
       catch (InterruptedException e) {}
     }
//  }

}