// A Clock with client and server timings.

// Amit C. (ConnectSoft Ruksun, Pune, India) amit@maverick.corus.co.in



import	java.awt.Color ;

import	java.awt.Dimension;

import	java.awt.Font;

import	java.awt.Graphics;

import	java.awt.Image;

import	java.net.Socket;

import	java.net.URL;

import	java.io.DataInputStream;

import	java.io.IOException;

import	java.util.Date;

import	java.util.StringTokenizer;



// Class NewClock.

// The class that displays the current time ands the server time too.

public class NewClock extends java.applet.Applet implements Runnable 

{

	Thread	clockThread ;

	String	Server;

	String	sServerTime;

	Date	ServerTime = new Date();

	Color	clrTextColor = new Color (255, 255, 255 ) ;

	Color	clrBackGndColor = new Color (0, 0, 0 ) ;

	String	sFontName ;			// Text font, max = 72 ?

	int		iFontSize ;

	String	sRemotePrompt, sLocalPrompt;

	int		iRemotePos, iLocalPos;

	String	Text_Pos ;



	private	Image 		offScreenImage;

	private	Graphics 	offScreenGraphics;

	private	Dimension 	offScreenSize;



	/////////////////////////////////////////////////////////////////////////

	// init() - get the server and the time at this server. Get the applet params.

	public void init() 

	{



		GetParams ();				// Get the info passed in params.

									

									// NOTE : font set in above func!

									// Now set the font specified

		setFont( new Font( sFontName, Font.PLAIN, iFontSize ) );



									// Get the server name from the applet.

		Server = new String (GetServerName() );



									// Use the daytime protocol to get server time

		sServerTime = GetServerTime (Server );

		

										// Get Time from String!!

		StringTokenizer st = new StringTokenizer (sServerTime, ":") ;

		ServerTime.setHours (Integer.valueOf(st.nextToken()).intValue());

		ServerTime.setMinutes (Integer.valueOf(st.nextToken()).intValue());

		ServerTime.setSeconds (Integer.valueOf(st.nextToken()).intValue());

	}



	public void GetParams()

	{

									// get the position of text, Before/After time

		Text_Pos = new String(MygetStringParam("text_position", "Before" ));

									// get the prompt for Remote time

		sRemotePrompt = new String(MygetStringParam("remote_prompt", "" ));

									// get the position for remote time

		iRemotePos = MygetintParam ("remote_xpos", 150) ;



									// get the prompt for Remote time

		sLocalPrompt = new String(MygetStringParam("local_prompt", "" ));

									// get the position for remote time

		iLocalPos = MygetintParam ("local_xpos", 50) ;



									// Get the specified color for text, else 

									// use black

		clrTextColor = StringToColor (

	   						MygetStringParam("text_color", null), 

							Color.black ) ;

									// Get the specified color for background,

									// else use red

		clrBackGndColor = StringToColor (

	   						MygetStringParam("background_color", null), 

							Color.white ) ;



									// get the Font name

		sFontName = new String(MygetStringParam("font_name", "TimesRoman" ));

									// get the Font size

		iFontSize = MygetintParam ("font_size", 14) ;

	}



	////////////////////////////////////////////////////////////////////

	// start() - The applet starts again, so start the thread too!

    public void start() 

	{

		if (clockThread == null) 

		{

	    	clockThread = new Thread(this, "Clock");

	    	clockThread.start();

		}

    }



	////////////////////////////////////////////////////////////////////

	// run() - For the thread, repaint and sleep for .8 sec, (so little I tell you, :-) )

    public void run() 

	{

		while (clockThread != null) 

		{

	    	repaint();

	    	try 

			{

				clockThread.sleep(800);			// Sleep for 800 millisec

	    	} 

			catch (InterruptedException e)

			{

	    	}

		}

    }



	////////////////////////////////////////////////////////////////////

	// stop() - The applet has stopped, so kill the thread, we will start again!! Yess!!

    public void stop() 

	{

		clockThread.stop();

		clockThread = null;

    }



	/////////////////////////////////////////////////////////////////////////



	// GetServerTime() - Use the server name and daytime protocol to get time!

	public String GetServerTime (String Server ) 

//	throws java.io.IOException

	{

		Socket   		Client;

		DataInputStream ServerOut;

		int             port = 13;	// The daytime port!

		String			incoming;



		try

		{

									// Open server

			Client = new Socket (Server, port);

									// Convert to DataInput to read Server output

			ServerOut = new DataInputStream(Client.getInputStream());

									// Read the first line!

			incoming = ServerOut.readLine();

			Client.close();

		}

		catch (IOException e)

		{

			return null;

		}



		StringTokenizer st = new StringTokenizer (incoming);



		while (st.hasMoreTokens() )	// Get the last

			incoming = new String (st.nextToken()) ;



		return incoming;

	}



	/////////////////////////////////////////////////////////////////////////

	// GetServerName() - Get the server name.

	public String GetServerName () 

	{

		String BaseURL;			// Where the applet is located

		String Tmp = null;



								// Get the whole URL

		BaseURL = new String (getCodeBase().toString() );



								// Extract the server from this

		StringTokenizer st = new StringTokenizer (BaseURL, "//") ;

		if (st.hasMoreTokens() )

			Tmp = new String (st.nextToken()) ;

		if (st.hasMoreTokens() )

			Tmp = new String (st.nextToken()) ;

		

//		if ( Tmp.indexOf("www") != -1 )

//			Tmp = new  String (Tmp.toCharArray(), 4, Tmp.length()-4 );



		return Tmp;



	}



	////////////////////////////////////////////////////////////////////

	// MygetStringParam() - My version of getparam, can be used to get string params.

	public	String	MygetStringParam (String att, String def) 

	{

		String ret;



		try 

		{

			ret = getParameter(att);

			if (ret.length() < 1)

				return def;

			else

				return ret;

		} 

		catch(Exception e) 

		{

			return def;

		}

	}   



	////////////////////////////////////////////////////////////////////

	// MygetintParam() - My version of getparam, can be used to get integer params.

	public	int	MygetintParam (String att, int def) 

	{

		Integer RetParam ;



		try 

		{

			RetParam = new Integer (getParameter(att) ) ;

			if (RetParam.intValue() == 0)

				return def;

			else

				return RetParam.intValue() ;

		} 

		catch(Exception e) 

		{

			return def;

		}

	}   



	////////////////////////////////////////////////////////////////////

	// StringToColor() - Given a 'String' parses it to get the 'Color'.

	public Color StringToColor (String strColor_p, Color clrDefault_p ) 

	{

		if (strColor_p.length ( ) == 0) 

			return clrDefault_p ;



		int r;

		int g;

		int b;

										// Delimiter is ','

		StringTokenizer st = new StringTokenizer (strColor_p, ",") ;



		try 

		{

			r = Integer.valueOf(st.nextToken()).intValue();

			g = Integer.valueOf(st.nextToken()).intValue();

			b = Integer.valueOf(st.nextToken()).intValue();

			return new Color(r,g,b);

		}

		catch (Exception e) 

		{

			return clrDefault_p;

		}

	}



	////////////////////////////////////////////////////////////////////

	// getAppletInfo() - Returns all info, hope Netscape will support it one day!

	public String getAppletInfo()

	{

	      return "Clock2,  a Java Applet by Amit Chaudhary \n Email -> (amit@maverick.corus.co.in), 27/1/96";

	}



	public void paint(Graphics g) 

	{

		String	sTimeNow ;



//		showStatus ("Running out of time here..") ;



		g.setColor (clrBackGndColor ) ;	// The background specified

		g.fillRect (0, 0, size().width, size().height ) ;



		g.setColor (clrTextColor ) ;	// The text color specified

									// Cheating here by just incrementing by 1 sec,

									// All in a good cause. saves a socket call.

		int	Seconds = ServerTime.getSeconds();

		if (Seconds >= 59 )

		{

			ServerTime.setSeconds (0 );

			int	Minutes = ServerTime.getMinutes();

			if (Minutes >= 59 )

			{

				ServerTime.setMinutes (0 );

				int	Hours = ServerTime.getHours( );

				ServerTime.setHours (Hours >= 24? 0: Hours+1 );

			}

			else

				ServerTime.setMinutes (Minutes + 1 );

		}

		else

			ServerTime.setSeconds (Seconds + 1 );

		

		sServerTime = ServerTime.getHours() + ":" + 

						ServerTime.getMinutes()/10 + ServerTime.getMinutes()%10 +

						":" + ServerTime.getSeconds()/10 + ServerTime.getSeconds()%10;



		Date now = new Date();		// Get current time here, now!



		sTimeNow = now.getHours() + ":" + now.getMinutes()/10 + now.getMinutes()%10 + ":" 

					+ now.getSeconds()/10 + now.getSeconds()%10;



		if (Text_Pos.compareTo ("Before") == 0 ) 

		{

			g.drawString (sRemotePrompt + " " + sServerTime, 10, iRemotePos ) ;

			g.drawString (sLocalPrompt + " " + sTimeNow, 10, iLocalPos ) ;

		}

		else

		{

			g.drawString (sServerTime + " " + sRemotePrompt, 10, iRemotePos ) ;

			g.drawString (sTimeNow + " " + sLocalPrompt, 10, iLocalPos ) ;

		}

	}



	////////////////////////////////////////////////////////////////////

	// update() - Uses double buffering for flicker free update

	public final synchronized void update (Graphics theG)

	{

		Dimension d = size();



		if((offScreenImage == null) || (d.width != offScreenSize.width) ||

			(d.height != offScreenSize.height)) 

		{

			offScreenImage = createImage(d.width, d.height);

			offScreenSize = d;

			offScreenGraphics = offScreenImage.getGraphics();

			offScreenGraphics.setFont(getFont());

		}

		offScreenGraphics.fillRect(0,0,d.width, d.height);

		paint(offScreenGraphics);

		theG.drawImage(offScreenImage, 0, 0, null);

    }



}