///////    Bookmark.java    ///////
import java.awt.*;
import java.io.*;
import java.net.*;
import java.awt.event.*;
import java.util.StringTokenizer;

/**    Program that searches a file of favorite web sites
       for a location and automatically displays
       the web page a separate browser window
*/

public class Bookmark extends Frame
{  public Bookmark(String file)
   {    super(file);
	bmFile=file;
        init();
   }

   protected Bookmark() { }
      
   public void init()
   {   try
       {  FileInputStream in = new FileInputStream(bmFile);
          lines = new TextLines();
          lines.input(in);
          setLayout(card = new CardLayout());
          setSize(600, 180);              
          if ( sp == null ) { searchPanel(); add(sp, SEARCH); }
          if ( op == null ) { openPanel();   add(op, OPEN); }
          if ( ep == null ) { errPanel(); add(ep, ERROR); }
          card.show(this, SEARCH);
       }  catch(FileNotFoundException e)
          {  System.err.println(bmFile + "not found!");
             e.printStackTrace();
             return;
          }
   }
   
   protected String bmFile;    // the bookmark file

   protected void searchPanel()
   {   sp = new Panel();
       sp.setLayout(new BorderLayout());
       Panel tp = new Panel();
       tp.setLayout(new BorderLayout());
       Panel entp = new Panel();
       Label enter = new Label("String to search: ");
       entp.add(enter);
       entp.add(st = new TextField(20));
       Panel bp = new Panel();
       bp.setLayout(new FlowLayout(FlowLayout.CENTER, 100, 5));
       bp.add(sb = new Button("Search"));
       bp.add(gb = new Button("  Go  "));
       bp.add(nb = new Button("Cancel"));
       tp.add(entp, "Center");
       tp.add(bp, "South");
       sp.add(tp, "Center");
       sb.addActionListener(new SearchHandler());
       gb.addActionListener(new GoHandler());
       nb.addActionListener(new CancelHandler());
   }

   protected void openPanel()
   {   op = new Panel();
       op.setLayout(new BorderLayout());
       Label fd = new Label("Matches found: ");
       op.add(fd, "West");
       lis = new List(5);
       lis.setBackground(Color.cyan);
       op.add(lis, "Center");
       Panel bp = new Panel();
       bp.setLayout(new FlowLayout(FlowLayout.CENTER, 100, 5));
       bp.add(ob = new Button("  Open  "));
       bp.add(cb = new Button(" Cancel "));
       op.add(bp, "South");
       ob.addActionListener(new OpenHandler());
       cb.addActionListener(new OkHandler());
   }

   protected void errPanel()
   {   ep = new Panel();
       ep.setLayout(new BorderLayout());
       errlab = new Label(NOMATCH);
       ep.add(errlab, "Center");
       ep.add(kb = new Button("  OK  "), "South");
       kb.addActionListener(new OkHandler());
   }

// url is 1st token
   protected String firstToken(String s)
   {   StringTokenizer tk = new StringTokenizer(s);
       return tk.nextToken();
   }

   protected String browser = "netscape"; 
   protected String[] command = {browser, ""}; 
   protected Button sb, gb, ob, nb, cb, kb; 
   protected Panel op, sp, ep;
   protected CardLayout card = null; 
   protected List lis; 
   protected Label errlab; 
   protected TextField st;
   protected TextLines lines;
   protected MatchingLines sites;

   final static String NOMATCH = "No Match Found";
   final static String ERROR = "Error Panel";
   final static String SEARCH = "Search Panel";
   final static String OPEN = "Open Panel";


// back to search panel
   private final class CancelHandler
                 implements ActionListener
   {   public void actionPerformed(ActionEvent e)
       {   setVisible(false);
           System.exit(0);
       }
   }

// back to search panel
   private final class OkHandler
                 implements ActionListener
   {   public void actionPerformed(ActionEvent e)
       {   card.show(Bookmark.this,SEARCH);
       }
   }

// Opens user selection
   private final class OpenHandler
                 implements ActionListener
   {   public void actionPerformed(ActionEvent e)
       {   openSite(firstToken(lis.getSelectedItem())); 
       }
   }

   protected void openSite(String site)
   {   command[1] = site;
       try
       { Runtime.getRuntime().exec(command);
       } catch (IOException e)
         {   errlab.setText("Trouble: " 
                     + command[0] + " " + command[1]);
             card.show(this,ERROR);
         }
   }

// If search produces unique match, open it directly
   private final class GoHandler
                 implements ActionListener
   {   public void actionPerformed(ActionEvent e)
       {   sites = new MatchingLines(lines, st.getText());
           if ( sites.length() == 1 )
               openSite(firstToken(sites.getLine(0).toString()));
           else  //  ask user
               showSites();
       }
   }

// displays matched sites for user selection
   protected void showSites()
   {   // single-selection list
       if ( lis.getItemCount() > 0 )
            lis.removeAll();    // clear any previous entries
       int items = sites.length();
       if ( items > 0 )
       {  for (int i=0; i < items; i++)
              lis.add(sites.getLine(i).toString());
          lis.select(0);
          card.show(this,OPEN);
       }
       else  // error panel
       {  errlab.setText(NOMATCH);
          card.show(this,ERROR);
       }
   }

// Displays search result and let user select one to open
   private final class SearchHandler
                 implements ActionListener
   {   public void actionPerformed(ActionEvent e)
       {   sites = new MatchingLines(lines, st.getText());
           showSites();
       }
   }

   public static void main(String[] args)
   {   if ( args.length > 0 && args.length <= 2 ) 
       {   Bookmark bk = new Bookmark(args[0]);
           if ( args.length == 2 )
              bk.command[0] = bk.browser = args[1];
           bk.setVisible(true);
       }
       else
       {  System.err.println(
            "Usage: java Bookmark bookmark-file browser");
          System.exit(1);
       }
   }
}