/*
 * Copyright (c) 1998 The Regenstrief Institute.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Written by Gunther Schadow.
 *
 * $Id: UnitsApplet.java,v 1.3 1999/05/23 19:13:59 schadow Exp schadow $
 */

import java.lang.*;
import java.io.*;
import units.Unit;
import units.UnitTab;
import units.ParseException;
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.text.NumberFormat;

public class UnitsApplet
  extends Applet
{
  Frame win = null;
  NumberFormat numForm = NumberFormat.getInstance();

  public static void main(String argv[]) {
    UnitsApplet applet = new UnitsApplet();
    applet.application_init();
  }

  public UnitsApplet() { super(); }

  private void application_init() {
    win = new Frame("Units");
    win.setLayout(new FlowLayout());
    win.setSize(120,180);
    win.setResizable(false);
    win.add(this);
    
    init();
    start();

    win.pack();
    win.show();
    
    try { Thread.sleep(10000); } 
    catch(Exception x) {};
      
    stop();
    destroy();
  }

  Input from_value = null;
  Input from_unit  = null;
  Input to_value = null;
  Input to_unit  = null;
  TextField status = null;
  Choice dbchoice = null;

  static String table_names[] = {
    "Unified Code for Units of Measure (UCUM) c/s",
    "Unified Code for Units of Measure (UCUM) c/i",
    "SI plain",
    "ISO 1000",
    "ISO 2955 case sensitive (original)",
    "ISO 2955 case sensitive (fixed)",
    "ISO 2955 case insensitive",
    "ANSI X 3.50 case sensitive (original)",
    "ANSI X 3.50 case sensitive (fixed)",
    "ANSI X 3.50 case insensitive (original)",
    "ANSI X 3.50 case insensitive (fixed)",
    "HL7 ISO+",
    "HL7 ISO+ANSI+",
  };

  static String file_names[] = {
    "ucum-cs",
    "ucum-ci",
    "SI",
    "ISO1000",
    "ISO2955-cs",
    "ISO2955-cs-fixed",
    "ISO2955-ci",
    "ANSI-X3.50-cs",
    "ANSI-X3.50-cs-fixed",
    "ANSI-X3.50-ci",
    "ANSI-X3.50-ci-fixed",
    "HL7-ISO+",
    "HL7-ISO+ANSI+",
  };

  int current_table = 0;

  void read()
       throws IOException
  {
    String url = getCodeBase() +
      file_names[current_table] +
      ".units";
    
    UnitTab.read(url);
    
    status.setText("read: `" + url + "'");
  }
  
  void change_table() 
       throws IOException
  {
    int new_table = dbchoice.getSelectedIndex();

    // System.out.println("change table " + current_table + " -> " + new_table);

    if(new_table != current_table) {
      current_table = new_table;
      read();
    }
  }

  public void init()
  {
    numForm.setMaximumFractionDigits(4);

    from_value = new Input(this, "From Value:", 8, true);
    from_unit  = new Input(this, "Unit:", 8, true);
    to_unit    = new Input(this, "To: Unit", 8, true);
    to_value   = new Input(this, "Value:", 8, false);

    Button okbutton = new Button("OK");
    // JDK-1.1 okbutton.addActionListener(new ConvertListener(this));
    add(okbutton);

    status = new TextField();
    status.setEditable(false);
    status.setFont(new Font("helvetica", Font.PLAIN, 12));
    add(status);
    status.setText("Copyright (c) 1998 Regenstrief Institute. NO WARRANTY!");

    dbchoice = new Choice();
    for(int i = 0; i < table_names.length; i++)
      dbchoice.addItem(table_names[i]);
    add(dbchoice);
    dbchoice.select(current_table);

    try {
      read();
    }
    catch(IOException x) {
      status.setText("error :" + x.getMessage());
    }
  }

  public void start() {    
  }
  
  public void stop() {
  }
  
  public void destroy() {
  } 


  public boolean action(Event evt, Object arg) {
    if("OK".equals(arg)) {
      doit();
      return true;
    }

    return false;
  }

  void doit() {
    try {
      // change table?
      change_table();
      
      // read a value
      double mu1 = Double.valueOf(from_value.getText()).doubleValue();
      
      // read from unit
      Unit u1 = new Unit(from_unit.getText());
      
      // u1.dump();
      
      // read to unit
      Unit u2 = new Unit(to_unit.getText());
      
      // u2.dump();
      
      // convert
      double mu2 = u1.convertTo(mu1, u2);
      
      status.setText("" + numForm.format(mu1) + " " + u1 + " = " + numForm.format(mu2) + " " + u2);
      to_value.setText("" + numForm.format(mu2));
    }
    catch(Exception x) {
      if(! (x instanceof java.lang.NoSuchMethodException))
	status.setText("" + x.getClass().getName() + ": " + x.getMessage());
    }
  }
}

// A TextField in a Panel with a Label
class Input
{
  Label     label = null;
  TextField text  = null;
  
  public Input(Container w, String s, int width, boolean editable) {
    label = new Label(s,Label.RIGHT);
    Font font = new Font("helvetica", Font.PLAIN, 10);
    label.setFont(font);
    
    text = new TextField("",width);
    text.setEditable(editable);
    w.add(label);
    w.add(text);
  }

  public String getText() { return text.getText(); }
  
  public void   setText(String s) 
  {     
    text.setText(s); 

    /** don't want to reposition to the beginning */
    // text.setCaretPosition(0);
  }
}

/* This is JDK-1.1 stuff that won't work in most current browsers

class ConvertListener 
  implements ActionListener
{
  UnitsApplet app;

  public ConvertListener(UnitsApplet a) { app = a; }
    
  public void actionPerformed(ActionEvent e)
  {  app.doit();  }
}

*/