/**
 * Navigator.java  1.00 96/10/07 Merlin Hughes
 *
 * Copyright (c) 1996 Prominence Dot Com, Inc. All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this software
 * for non-commercial purposes and without fee is hereby granted
 * provided that this copyright notice appears in all copies.
 *
 * http://prominence.com/                  merlin@prominence.com
 */
import java.awt.*;
import java.net.*;
import java.io.*;
import java.util.*;

public class Navigator extends Frame implements Runnable {
  Sextant parent;
  Page page;
  Scrollbar bar;
  Label status;
  Button go;
  String target;

  public Navigator () {
    super ("Sextant Navigator");
    setBackground (Color.black);
    setLayout (new BorderLayout (1, 1));

    Panel top = new Panel ();
    top.setBackground (Color.white);
    top.setLayout (new BorderLayout ());
    add ("Center", top);
    bar = new Scrollbar (Scrollbar.VERTICAL);
    top.add ("East", bar);
    page = new Page (bar);
    page.setFont (new Font ("Helvetica", Font.BOLD, 14));
    top.add ("Center", page);

    Panel bottom = new Panel ();
    bottom.setBackground (Color.white);
    bottom.setLayout (new BorderLayout ());
    add ("South", bottom);
    status = new Label ("Loading...");
    status.setForeground (Color.blue);
    status.setFont (new Font ("Helvetica", Font.PLAIN, 14));
    bottom.add ("Center", status);
    go = new Button ("Go!");
    go.setFont (new Font ("Helvetica", Font.BOLD, 14));
    bottom.add ("East", go);
  }

  public void init (Sextant parent) {
    this.parent = parent;
    target = parent.getParameter ("target", "_new");
    if (parent.getParameter ("title") != null)
      setTitle (parent.getParameter ("title"));
    page.init (parent);
    new Thread (this).start ();
  }

  public void run () {
    try {
      URL url = new URL (parent.getDocumentBase (),
			 parent.getParameter ("map", "siteMap.txt"));
      InputStream i = url.openStream ();
      DataInputStream dI = new DataInputStream (i);
      String line;
      while ((line = dI.readLine ()) != null) {
	StringTokenizer tokens = new StringTokenizer (line, "|");
	try {
	  String lineUrl = tokens.nextToken ().trim (),
	    lineName = tokens.nextToken ().trim (),
	    lineComment = tokens.nextToken ().trim ();
	  int depth = 0;
	  while (lineUrl.charAt (depth) == '-')
	    ++ depth;
	  page.addLine (depth, new URL (parent.getDocumentBase (), lineUrl.substring (depth)), lineName, lineComment);
	} catch (Exception ex) {
	  System.out.println ("Misformatted line: " + line);
	}
      }
      dI.close ();
      status.setText ("Loaded.");
      page.layout ();
      page.repaint ();
    } catch (IOException ex) {
      status.setText (ex.toString ());
    }
  }

  public boolean handleEvent (Event e) {
    if ((e.id == -1) && (e.target == this)) {
      init ((Sextant) e.arg);
    } else if ((e.id == Event.WINDOW_DESTROY) && (e.target == this)) {
      hide ();
    } else if ((e.id == Event.ACTION_EVENT) && (e.target == go)) {
      URL url = page.currentURL ();
      if (url != null)
	parent.getAppletContext ().showDocument (url, target);
    } else if ((e.id == Event.LIST_SELECT) && (e.target == page)) {
      status.setText ((String) e.arg);
    } else if ((e.id == Event.ACTION_EVENT) && (e.target == page)) {
      parent.getAppletContext ().showDocument ((URL) e.arg, target);
    } else if ((e.target == bar) && (e.id >= Event.SCROLL_LINE_UP) && (e.id <= Event.SCROLL_ABSOLUTE)) {
      page.repaint ();
    }
    return super.handleEvent (e);
  }

  public Dimension preferredSize () {
    return new Dimension (320, 240);
  }
}