/**************************************************************************
Java Demo chooser
CS 406 Internet Programming with Java
Dr. Webster
Fall 1996
Randall E. Kaufman

this java application presents the user with a choice of demos to run, 
simply by picking the corresponding button. 

it requires the file demo.dat to be in the same directory. see that 
file for proper formatting
***************************************************************************/

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


public class DemoGUI extends Frame
{
   String demoFile = "demo.dat";
   String title;
   Vector lineV;
   Vector demoArray;
   
   void readData(DataInputStream is) throws IOException
   {  
      String tempLine;
      tempLine = is.readLine();
      do 
      {  
         tempLine = is.readLine();
      } while (tempLine.startsWith("#"));
      
      title = tempLine;
      
      lineV = new Vector();
      tempLine = is.readLine();
      do
      {  
         lineV.addElement(tempLine);
         tempLine = new String();
         tempLine = is.readLine();
      } while (!tempLine.equals("START DEMO LIST"));

      demoArray = new Vector();
      tempLine = is.readLine();
      do
      {  
         demoArray.addElement(new Demo(tempLine));
         tempLine = is.readLine();
      } while (!tempLine.equals("END DEMO LIST"));

   }

   public DemoGUI()
   {
      try
      { 
         DataInputStream is = new DataInputStream(new FileInputStream(demoFile));   
         readData(is);
      }
      catch(IOException e)
      {  System.out.println("Error: " + e);
         System.exit(1);
      }

      setTitle(title);

      Panel top = new Panel();
      top.setLayout(new GridLayout(lineV.size(),1,1,1));
      for (int i = 0; i < lineV.size(); i++)
         top.add(new Label((String)(lineV.elementAt(i)),Label.CENTER));

      Panel middle = new Panel();
      int numRows = demoArray.size()/4 + 1;
      middle.setLayout(new GridLayout(numRows,4,2,2));
      for (int i = 0; i < demoArray.size(); i++)
         middle.add(new Button(((Demo)(demoArray.elementAt(i))).getDesc()));
      
      Panel bottom = new Panel();
      bottom.setLayout(new FlowLayout());
      bottom.add(new Label(" "));
      bottom.add(new Button("Quit"));
      bottom.add(new Label(" "));
      
      setLayout(new BorderLayout());
      add("North",top);
      add("Center",middle);
      add("South",bottom);
      
      pack();
      show();
   }

   public boolean handleEvent(Event evt)
   {  
      if (evt.id == Event.WINDOW_DESTROY) 
         System.exit(0);
      return super.handleEvent(evt);
   }

   public boolean action(Event evt, Object arg)
   {  
      if (arg.equals("Quit")) 
      {  
         System.exit(0);
      }
      else 
      {
         int i = 0;
         int progSelected = 0;
         while (i < demoArray.size())
         {  
            if (arg.equals(((Demo)(demoArray.elementAt(i))).getDesc()))
            {
               progSelected = i;
               i = demoArray.size()+1;
            } else i++;          }                           
         if (i > demoArray.size())                    
         {                
            Demo tempDemo = (Demo)(demoArray.elementAt(progSelected));
            File tempFile = tempDemo.getFile();
// these println's were originally for debugging, put are useful when
// adding new items. they can be commented out w/o harm.
            System.out.println("Trying to run program: " + tempFile.getName());
            System.out.println("   getName: " + tempFile.getName());
            System.out.println("   getParent: " + tempFile.getParent());
            System.out.println("   getPath: " + tempFile.getPath());
            System.out.println("   getAbsolutePath: " + tempFile.getAbsolutePath());
            System.out.println("   isFile: " + tempFile.isFile());
            System.out.println("   isDirectory: "+ tempFile.isDirectory());
            Runtime rt = Runtime.getRuntime();
            String cmd = tempFile.getPath();
            Process pr = null;

/* this blows up RWW */
            try pr = rt.exec(cmd);
            catch (java.io.IOException ex1)
            {
               System.out.println("IO Exception when calling exec");
               System.exit(1);
            }
       } else
            return false;
      } 
      return true;
   } 
   
   public static void main(String[] args)
   {  
      DemoGUI d = new DemoGUI();
   }      

}

class Demo
{
   private File filename;
   private String desc;
   
   public Demo(String rawString)
   {
      StringTokenizer t = new StringTokenizer(rawString, ":");
      desc = t.nextToken();
      filename = new File(t.nextToken());
    }         
   
   public Demo(String d, String path)
   {
      filename = new File(path);
      desc = d;
   }
   
   public File getFile()   {return filename;}
   public String getDesc() {return desc;}      
   
} //Demo