// excercise to simulate a safe

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


public class Mysafe extends Applet implements ActionListener
{
	private Button button[];
	private TextField text;
	private Font f;
	private Label label;
	private String LockCode;
	private String buffer="    ";//4 spaces
	private String CodeSelection[];
	private Panel panel1, panel2;
	private static int resetCount=0;
	private int numberTries=6; // to permanetley lock the safe if this is exceeded
	
	public void init()
	{
		// setBackground(Color.lightGray);
		this.setLayout(new BorderLayout());
		
		CodeSelection = new String[]{"5567","1234","2727","0123"};
		//initialise the Lock Code of the safe to the first code selection
		LockCode = new String(CodeSelection[0]);
		
		panel1 = new Panel();
		add("North", panel1);
		label = new Label("    CLOSED");
		f=new Font("Courier",Font.BOLD,18);
		label.setFont(f);
		
		panel1.add(label); // add label to pane
		label.setAlignment(Label.LEFT);// set label to the left
		
		//text field
		text=new TextField(25);
		panel1.add(text);
		
		panel2 = new Panel();
		add("Center",panel2);
		
		//set gridLayout for panel2(int rows,int col,int hgap,int vgap)
		panel2.setLayout(new GridLayout(4,2,5,5));
		
		button = new Button[13];
		
		for (int i=0;i<10;i+=1)
		{
			// array buttons
			button[i] = new Button(Integer.toString(i));
			panel2.add(button[i]);
			button[i].addActionListener(this);
		}
		
		button[10] = new Button("CLOSE");
		button[10].setForeground(Color.red);
		button[10].addActionListener(this);	
		
		button[11] = new Button("OPEN");
		button[11].setForeground(Color.red);
		button[11].addActionListener(this);	
		
		button[12] = new Button("NEW CODE");
		button[12].setForeground(Color.red);
		button[12].addActionListener(this);
		
		// add buttons to the layout
		panel2.add(button[10]);
		panel2.add(button[11]);
		panel2.add(button[12]);
	}	
	
	//action
	public void actionPerformed(ActionEvent e)
	{
		//checks if the button is pressed
		String a,currentNumber;
		// create a String buffer to manipulate the string
		StringBuffer found = new StringBuffer(buffer);
		int j,k;
		for(j=0;j<10;j+=1)
		{
			if(e.getSource()==button[j])
			{
				// get the string representationof the pressed button number
				currentNumber=button[j].getLabel(); // JApplet uses getText() method
				
				for(k=0;k<4;k+=1) // cycle through the four numbers in the code
				{
					// check to see if the button pressed matches a number in the code
					
					if(currentNumber.equals(String.valueOf(LockCode.charAt(k))))
					{
						//replace method to insert the matched number
						found.replace(k,k+1,currentNumber);
					}
				}
				numberTries-=1; // decrement the number of tries
				buffer = new String(found);
				text.setText(buffer);
				
				if(numberTries<1) // no more tries
				{
					label.setText("Alarm!Locked!");
					text.setText("LOCKSMITH - RESET!!");
				}
			}
		}
		
		if(e.getSource()==button[10]) //close
		{
			label.setText("CLOSED");
			buffer="    ";
			text.setText(buffer); // set text to buffer
		}
		
		if(e.getSource()==button[11])//open 
		{
			buffer="    ";
			if(LockCode.equals(text.getText()))
			{
				label.setText("SAFE OPEN");
				text.setText(buffer);
				numberTries=6; // new tries
			}
			else
			{
				numberTries-=1; 
				text.setText(buffer);
				if(numberTries<1) // no more tries
				{
					label.setText("ALARM!LOCKED!");
					text.setText("LOCKSMITH- RESET");
				}
			}
		}
		
		if(e.getSource()==button[12]) // new code
		{
			resetCount+=1; // moves to the next safe code
			//cycling through the available safe combinatoins in the code selection array
			LockCode=CodeSelection[resetCount%4];
			numberTries=6;
			buffer="    ";
			text.setText(buffer);
			label.setText("CLOSED");
		}
	}
}//end