//Author: ^-^Veerle^-^
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.Container;
import java.applet.Applet;
import javax.swing.JApplet;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JButton;
import javax.swing.JTextField;
import javax.swing.ImageIcon;
import javax.swing.JOptionPane;
import javax.swing.BorderFactory;
import java.util.Calendar;
import java.text.DecimalFormat;

public class binaryClock extends JApplet implements Runnable
{
	
	private final String[] strBinaryColumn = {"32", "16", "8", "4", "2", "1"};
	private final String[] strRowHeading = {"", "H:", "M:", "S:"};
	private final int WIDTH = 200, HEIGHT = 150;	
	private final DecimalFormat decFormat = new DecimalFormat("00");
	
	private Thread clockThread = null;
	private ImageIcon imgOn = null;

	private JLabel[][] lblClock;
	private JTextField txtTime;
	private JPanel panRoot, panClock, panSouthArea, panTime;
	
	private Container frame;
	
	public void init ()
	{
		
		try
		{
			imgOn = dataManager.createImageIcon(this, getParameter("LED"), "LED light");
		}
		catch (Exception ex)
		{
			JOptionPane.showMessageDialog(null, "The LED image could not be loaded\n" + ex.getMessage(), "Missing Files", JOptionPane.ERROR_MESSAGE);			
		}
		
		panClock = new JPanel(new GridLayout(4, (strBinaryColumn.length + 1), 2, 2));
		lblClock = new JLabel[4][(strBinaryColumn.length + 1)];
		
		for (int i = 0; i < 4; i++)
		{
			
			for (int k = 0; k < lblClock[i].length; k++)
			{
				
				if (k == 0) //First column, display column headings (H, M, S)
				{
					lblClock[i][k] = new JLabel(strRowHeading[i], JLabel.CENTER);
				}
				else
				{
					
					if (i == 0) //First row, display the binary column values (32,16,8,4,2,1)
					{
						lblClock[i][k] = new JLabel(strBinaryColumn[(k - 1)], JLabel.CENTER);
					}
					else //Normal cells which the LED could appear in
					{
						lblClock[i][k] = new JLabel("", JLabel.CENTER);
					}
					
				}
				
				panClock.add(lblClock[i][k]);
				
			}
			
		}
		
		txtTime = new JTextField("");
		txtTime.setToolTipText("For those who do not understand binary");
		txtTime.setEditable(false);	
		
		panSouthArea = new JPanel(new BorderLayout());
		panTime = new JPanel();
		panRoot = new JPanel(new BorderLayout());
		
		frame = getContentPane();
		
		frame.add(panRoot, BorderLayout.CENTER);
			panRoot.add(panClock, BorderLayout.NORTH);
			panRoot.add(panSouthArea, BorderLayout.SOUTH);
				panSouthArea.add(panTime, BorderLayout.NORTH);
					panTime.add(txtTime);
		//Add some padding to make the clock easier to read		
		panRoot.setBorder(BorderFactory.createEmptyBorder(2, 2, 2, 2));
		//Start the clock thread
		start();
		
	}
	//Called every second
	private void updateClock ()
	{
		
		Calendar cal = Calendar.getInstance(); //Gets the current time
		int[] time = {cal.get(Calendar.HOUR), cal.get(Calendar.MINUTE), cal.get(Calendar.SECOND)};
		txtTime.setText(decFormat.format(time[0]) + ":" + decFormat.format(time[1]) + ":" + decFormat.format(time[2]));

		setTime(time);		
		
	}
	
	private void setTime (int[] time)
	{
		
		for (int i = 0; i < time.length; i++)
		{
		
			for (int k = 0; k < strBinaryColumn.length; k++)
			{
				//Find all the columns this number go into, e.g. 33 is greater then 32, so the 32 column has a LED
				if (time[i] >= Integer.parseInt(strBinaryColumn[k]))
				{
					//Subtract the column value, e.g. 33 - 32 = 1, so it will loop until
					//it gets to the 1 column, and add an LED for that column
					time[i] -= Integer.parseInt(strBinaryColumn[k]);
					lblClock[(i + 1)][(k + 1)].setIcon(imgOn);
					
				}
				else //All the cells without an LED get reset
				{
					lblClock[(i + 1)][(k + 1)].setIcon(null);
				}
				
			}
			
		}
		
	}
	
	public void start ()
	{
		//If the clock thread is not currently running
		if (clockThread == null)
		{
			//Create the clock thread and start it
			clockThread = new Thread(this, "clock");
			clockThread.start();
			
		}
		
	}
	
	public void stop ()
	{
		//If the clock thread is currently running
		if (clockThread != null)
		{
			//Send an interrupt
			clockThread.interrupt();
			clockThread = null;
			
		}
		
	}
	
	public void run ()
	{
		
		Thread runningThread = clockThread;
		//Keeps running until it becomes null (from the stop() method)
		while (runningThread == clockThread)
		{
			
			updateClock();
			
			try
			{
				clockThread.sleep(1000L); //Sleep one second)
			}
			catch (Exception ex)
			{
			}
			
		}
		
	}
	
}