/*  guestbook.java                                                 *
 *  23rd May 1996                                                  *
 *                                                                 *
 *  simple applet to display contents of a guestbook text file     *
 *                                                                 *
 *  If you use this code, please let me know:                      *
 *  http://www.max.tc                                              *
 *  mail@max.tc                                                    */
 

/*  Note that this code expects the guestbook file to be of
 *  a certain format; I have a CGI script that generates this
 *  file from user comments which I can supply.                    */


import java.awt.*;
import java.awt.event.*;
import java.lang.Character;
import java.io.*;
import java.net.*;
import java.lang.System;

public class guestbook extends java.applet.Applet implements Runnable 
{
	// Constants
	String COPYRIGHT_INFO = "GuestBook Applet";
	String FONT_NAME = "Helvetica";
	int FONT_SIZE = 12;
	boolean userPause = false; 

	// Off-screen graphics buffer
	Image OffBuff;
	Graphics gOffBuff;

	// Other stuff
	int appletWidth;
	int appletHeight;
	Thread displayThread = null;
	Font boldFont, plainFont;
	FontMetrics fm;
	
	public void init() 
	{
		appletWidth = size().width;
		appletHeight = size().height;
		ReadParameters();
		InitDisplayData();
	}

	URL guestbookURL;

	private void ReadParameters()
	{
		String tFile;

		tFile = getParameter("file");
		if (tFile == null)
			tFile = "GuestBook.shtml";

		try {
			guestbookURL = new URL(getCodeBase(), tFile);
 		} catch (MalformedURLException e) {
			System.out.println("e2");	
		} 
	}

	private void InitDisplayData()
	{
		showStatus(COPYRIGHT_INFO);
		plainFont = new Font(FONT_NAME,Font.PLAIN,FONT_SIZE-2);
		boldFont = new Font(FONT_NAME,Font.BOLD,FONT_SIZE);
		OffBuff = createImage(size().width,size().height);
		gOffBuff = OffBuff.getGraphics();
	}

	public String getAppletInfo()
	{
		return COPYRIGHT_INFO;
	}

	public String[][] getParameterInfo()
	{
		String pinfo[][] = {
	        	{"file",	"string",		"File from whch to read; defaults to GuestBook.shtml"}
	    	};

		return pinfo;
	}

	public void start() 
	{
		if (displayThread == null) {
			displayThread = new Thread(this);
			displayThread.start();
		}
	}

	public void stop() 
	{
		if (displayThread != null && displayThread.isAlive())
			displayThread.stop();
		displayThread = null;
	}

    public boolean handleEvent(Event evt) {
	if (evt.id == Event.MOUSE_DOWN) {
		if (displayThread != null && displayThread.isAlive()) {
		    if (userPause) {
			displayThread.resume();
		    } else {
			displayThread.suspend();
		    }
		    userPause = !userPause;
		} else {
		    userPause = false;
		    displayThread = new Thread(this);
		    displayThread.start();
		}
	    return true;
	} else {	    
	    return super.handleEvent(evt);
	}
    }


	public void run() 
	{
		long startTime;
		int charDelayTime = 50;
		
		while (Thread.currentThread() == displayThread) 
		{
			startTime = System.currentTimeMillis();
			repaint();
			updateBuffer();

			try {
				Thread.sleep(Math.max(20,startTime+charDelayTime-System.currentTimeMillis()));
			} catch (InterruptedException e) {
				;
			}
		}
	}

	public void update(Graphics g)
	{
		g.drawImage(OffBuff,0,0,this);
	}

	int cx, cy;
	boolean ubinit = false;
	int colMod;
/*	String testString = "Go placidly amid the noise & haste & remember what peace there may be in silence.\n" +
		"As far as possible be on good terms with all persons.  Speak your truth quietly & clearly & listen to " +
		"others, even the dull & ignorant; they too have their story.  Avoid loud & agressive persons they are " +
		"vexations to the spirit.\nIf you compare yourself with others you may become vain & bitter; for always " +
		"there will be greater & lesser persons than yourself.\nEnjoy your achievements as well as your plans.  " +
		"Keep interested in your own career however humble; it is a real possession in the changing fortunes of " +
		"time.\nExcercise caution in your business affairs; for the world is full of trickery.  But let this not " +
		"blind you to what virtue there is.  Many persons strive for high ideals & everywhere life is full of " +
		"heroism.\nBe yourself.  Especially do not feign affection.  Neither be cynical about love, for in the " +
		"face of aridity & disenchantment, it is perenial as the grass.\nTake kindly the counsel of years, " +
		"gracefully surrendering the things of youth.\nNurture strength of spirit to shield you in sudden misfortune.  " +
		"But do not distress yourself with imaginings.  Many fears are born of fatigue & loneliness.\nBeyond a " +
		"wholesome discipline, be gentle with yourself.  You are a child of the universe no less than the trees " +
		"and stars.\nYou have a right to be here.  And whether or not it is clear to you, no doubt the universe " +
		"is unfolding as it should.\nTherefore be at peace with God whatever you conceive Him to be & whatever " +
		"your labours & aspirations in the noisy confusion of life.  Keep peace with your soul.\nWith all its " +
		"sham & drudgery & broken dreams, it is still a beautiful world.\nBe careful.\nStrive to be happy.\n\n\n";
*/
	BufferedReader bFileRdr;
	Color curCol = Color.blue;
	boolean inMsg = true;

	private void updateBuffer() { try
	{
		int i, ncx, inchar, fc;
		char c[] = new char[1];
		char ch;
		final Color bkgCol = Color.black;
		final int MaxWordLength = 100;
		boolean f, realAmpersand;

		if (!ubinit) // this code executes once only
		{
			cx = 0;
			cy = appletHeight / 2;
			gOffBuff.setColor(Color.yellow);
			gOffBuff.fillRect(0,0,appletWidth,appletHeight);
			gOffBuff.setColor(Color.black);

			try {
				bFileRdr = new BufferedReader(new InputStreamReader(guestbookURL.openStream()));
			} catch (FileNotFoundException e) {
				System.out.println("File " + guestbookURL + " not found");
			} catch (IOException e) {
				System.out.println("Exception on opening " + guestbookURL);
			}

			ubinit = true;
		}

		gOffBuff.setColor(Color.black);

		inchar = bFileRdr.read();

		// HTML parsing
		realAmpersand = false;

		do 
		{
			f = false;

			if (inchar == '<') 
			{
				fc = bFileRdr.read();
				while (bFileRdr.read() != '>')
					;
				
				switch (fc) {
					case 'A':
						inchar = '\n';
						break;
					case '!':
						inchar = ' ';
						if (curCol == Color.red)
							curCol = Color.blue;
						else
							curCol = Color.red;
						inMsg = true;
						break;
					case '/':
						inMsg = false;
					default:
						inchar = bFileRdr.read();
						break;
				}

				f = true;
			}

			if (inchar == '&' && !realAmpersand)
			{
				bFileRdr.mark(10);
				bFileRdr.read();
				bFileRdr.read();

				if (bFileRdr.read() == ';') {
					inchar = bFileRdr.read();
					realAmpersand = false;
				} else {
					bFileRdr.reset();
					realAmpersand = true;
				}
				f = true;
			} else {
				realAmpersand = false;
			}
		}
		while (f);

		if (inMsg) {
			gOffBuff.setFont(boldFont);
			fm = getFontMetrics(boldFont);
		} else {
			gOffBuff.setFont(plainFont);
			fm = getFontMetrics(plainFont);
		}

		if (inchar == -1) {
			// End of file; output a newline and re-open the file
			bFileRdr = new BufferedReader(new InputStreamReader(guestbookURL.openStream()));
			c[0] = '\n';				
		} else {
			c[0] = (char)inchar;
		}

		if (java.lang.Character.isSpace(c[0]) && c[0] != '\n')
			c[0] = ' ';

		if (!java.lang.Character.isISOControl(c[0])) {
			// Print character providing it's not a control
			gOffBuff.setColor(curCol);
			gOffBuff.drawChars(c, 0, 1, cx, cy);
			cx += fm.charWidth(c[0]);
		}

		// Code to handle word-wrapping
		if (java.lang.Character.isSpace(c[0]) && c[0] != '\n')
		{
			ncx=cx;
			bFileRdr.mark(MaxWordLength);

			while (ncx<appletWidth-fm.getMaxAdvance())
			{
				ch = (char)bFileRdr.read();
				if (java.lang.Character.isSpace(ch) || ch == -1)
					break;
				ncx += fm.charWidth(ch);
			}
			
			bFileRdr.reset();

			if (ncx >= appletWidth - fm.getMaxAdvance())
				cx = appletWidth - fm.getMaxAdvance();
		}

		// Move to next line
		if (cx >= (appletWidth - fm.getMaxAdvance()) || c[0]=='\n') {
			cx = 0;
			cy += (fm.getMaxAscent() + fm.getMaxDescent()) * (c[0]=='\n'? 1.0f : 1.0f);
		}

		// Code to handle scrolling
		// (not very good -- need to run scrolling through animation loop!)
		while (cy + fm.getMaxDescent() >= appletHeight) {
//			g.setColor(Color.yellow);
			gOffBuff.setColor(Color.yellow);
//			for (i=1; i<=fm.getMaxAscent() + fm.getMaxDescent(); i++) {
//				g.drawImage(OffBuff,0,-i,this);
//				g.fillRect(0,appletHeight-i,appletWidth,appletHeight);
//			}
			i = fm.getMaxAscent() + fm.getMaxDescent();
			gOffBuff.drawImage(OffBuff,0,-i,this);
			gOffBuff.fillRect(0,appletHeight-i,appletWidth,appletHeight);
			cy -= fm.getMaxAscent() + fm.getMaxDescent();
		}
	} catch (IOException e) {
		System.out.println("e1");
	} }

}