/**
 * @(#)Validointi.java
 *
 * Validointi Applet application
 *
 * @author 
 * @version 1.00 2009/10/29
 */
 
 
import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class Validointi extends Applet implements ActionListener {

	char[] merkit = { '1','2','3','4','5','6','7','8','9','0','A','B','C','D','E','F','H','J','K','L','M','N','P','R','S','T','U','V','W','X','Y'};
	TextField tx;
	Label lx;
	Button ok;
	String x,y;
	int a;
	char merkki, merkki2;
	
	public void init () {
		add(tx = new TextField("123654-123A"));
		add(lx = new Label(""));
		add(ok = new Button("Ok"));
		ok.addActionListener(this);
	}

	public void paint(Graphics g) {
		tx.reshape(40, 20, 100, 20);
		lx.reshape(40, 40, 180, 20);
		ok.reshape(40,60,40,20);
		g.drawString(""+a+" "+ (a % 31 )+" "+merkki2,150,20);
	}

	public void actionPerformed(ActionEvent e) {
		if (e.getActionCommand().equals("Ok")){
			try {
				x =  tx.getText() ;
				if ( x.matches ( "[0-9]{6}[-+A][0-9]{3}[0-9A-FHJ-NPR-Y]" ) ) { 
					a=Integer.valueOf( x.substring(0,6) + x.substring(7,10));
					merkki = x.charAt(10);
					merkki2 = merkit[ a % 31];
					lx.setText( x );
					tx.setText("");
					tx.requestFocus();
				} else throw new Exception();
			}
			catch (Exception f ) {
				lx.setText("Anna oikea tunnus");
				tx.setText("");
				tx.requestFocus();
			}
			
		}	 
		repaint();
	}
}