//Intruder Alarm Simulation
//Prototype by John Fenton
//Framework for HND/HNC IPDS Programming Exercise 

import java.awt.*;
import java.applet.*;
import java.awt.event.*;

public class IntAlm2 extends Applet implements
 ActionListener,ItemListener
{
   private Panel displayP,displayP2,displayP3;
   private Label labEC;
   private TextField tf;
   private Button okBut,but1,but2,but3,but4;
   private String code = "";
   private final String defaultCode = "1234";
   private String userCode = null;
   private boolean controlFlag = false;
   private CheckboxGroup bGrp;
   private Checkbox rBut1,rBut2,rBut3;
   
   public IntAlm2( )
   {
     setLayout(new BorderLayout( ));
   	topPanel( );
	add (displayP,BorderLayout.NORTH);
	midPanel( );
	add (displayP2,BorderLayout.CENTER);
	controlPanel( );  
   }
	
   public void topPanel( )
   {
	displayP = new Panel( );
	labEC = new Label("Enter Code: ");
	displayP.add(labEC);
	tf = new TextField(7);
	displayP.add(tf);
	okBut = new Button("OK");
	okBut.addActionListener(this);
	displayP.add(okBut);
   }
	
   public void midPanel()
   {
	displayP2 = new Panel( );
	displayP2.setLayout(new FlowLayout( ));
     displayP2.setFont(new Font("SansSerif",
                                     Font.PLAIN,20));
	but1 = new Button("1");
	but2 = new Button("2");
	but3 = new Button("3");
	but4 = new Button("4");
	but1.addActionListener(this);
	but2.addActionListener(this);
	but3.addActionListener(this);
	but4.addActionListener(this);
     displayP2.add(but1);
	displayP2.add(but2);
	displayP2.add(but3);
	displayP2.add(but4);
   }
	
   public void controlPanel( )
   {
	displayP3 = new Panel( );
	bGrp = new CheckboxGroup( );
	rBut1 = new Checkbox("Change code", false, bGrp);
	rBut2 = new Checkbox("Disable alarm", false, bGrp);
	rBut3 = new Checkbox("Dummy", false, bGrp);
	rBut1.addItemListener(this);
	rBut2.addItemListener(this);
	displayP3.add(rBut1);
	displayP3.add(rBut2);
   }
		
   public void actionPerformed(ActionEvent ae)
   {
	if(ae.getSource( ) == but1)
	{
	   code = code + "1";
	   tf.setText(code);
	}
	if(ae.getSource( ) == but2)
	{
	   code = code + "2";
	   tf.setText(code);
	}
	if(ae.getSource( ) == but3)
	{
	   code = code + "3";
	   tf.setText(code);
	}
	if(ae.getSource( ) == but4)
	{
	   code = code + "4";
	   tf.setText(code);
	}
	if(ae.getSource( ) == okBut)
	{
	   code = tf.getText( );
        if ((code.equals(defaultCode))||
                    (code.equals(userCode))||
                            (controlFlag == true))
	   {
	      if (rBut1.getState( ) == true)
	      {
	         userCode = code;
		    code = "";
		    waitaBit( );
		    tf.setText("New Code");
	         rBut3.setState(true);//switches off rBut1
		    waitaBit( );
	         disableController( );
		    tf.setText("");
	      }
	      else
	      {
		    enableController( );
	      }  				
	      if (rBut2.getState( ) == true)
	      {
	
	      }
	    }		
	  }
	}

	public void enableController( )
	{
	   add (displayP3,BorderLayout.SOUTH);
	   displayP3.setVisible(true);
	   validate( );
	   controlFlag = true;
	}
	
	public void disableController( )
	{
	   displayP3.setVisible(false);
	   validate( );
	   controlFlag = false;
	}
	
	public void itemStateChanged(ItemEvent ie)
	{
	   if (ie.getSource( ) == rBut1)
	   {
		tf.setText("");
		code = "";
	   }
	}

	public void waitaBit( )
	{
	   long timeInMis = System.currentTimeMillis( );
	   long t = 0;
	   do
	   {
		 t = t + 1;
   } while (System.currentTimeMillis( ) < timeInMis
    + 1000);
	}
}

//end.