/*
 * HollywoodText.java - 30 May 1996 - Version 1.0
 *
 * Copyright 1997 by Bill Giel/Moondog Software
 *
 * E-mail: bgiel@ct2.nai.net
 * WWW: http://w3.nai.net/~rvdi/bgiel/bill.htm
 *
 *
 * A LICENSE to use, copy, modify, and distribute this software
 * and its documentation for NON-COMMERCIAL purposes and without
 * fee is hereby granted, provided that any use properly credits
 * the author.
 *
 *
 * THE AUTHOR MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY
 * OF THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
 * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A  PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT. THE AUTHOR SHALL NOT BE LIABLE FOR ANY
 * DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
 * THIS SOFTWARE OR ITS DERIVATIVES.
 *
 */

import java.awt.*;
import java.applet.*;
import java.net.*;
import java.util.*;
import java.io.*;

//An applet class to display text in a fashion similar to
//computer terminals that we see only in the movies :-)
public class HollywoodText extends Applet
    implements Runnable
{
    
    final String MOREMESSAGE = "More...";

    Thread kicker;

    Vector script = new Vector();

    Image image;

    boolean threadSuspended,
            isRunning;

    //Configurable stuff...
    int width,
        height;

    Color   bgcolor,
            fgcolor;

    AudioClip sound;

    int cpause,
        lpause,
        spause,
        lspace,
        fontsize,
        cursor,
        indent,
        initx,
        inity,
        maxy;

    boolean loop;

    Image bgimage;

    MediaTracker tracker;

    String file;

    public String[][] getParameterInfo()
    {
        String[][] info = {
            {"width", "int", "width of the applet, in pixels"},
            {"height", "int", "height of the applet, in pixels"},
            {"bgcolor", "String", "RGB hex triplet for 'screen' background <black>"},
            {"fgcolor", "String", "RGB hex triplet for 'screen' foreground <green>"},
            {"sound", "String", "Sound clip file, relative to codebase <none>"},
            {"cpause", "int", "Delay between characters <25ms>"},
            {"lpause", "int", "Delay between lines <250ms>"},
            {"spause", "int", "Delay between repeats <500ms>"},
            {"loop", "int", "Non-zero causes applet to loop <1>"},
            {"script", "String", "Script file to display, relative to codebase <none>"},
            {"lspace", "int", "Line spacing <15>"},
            {"fontsize", "int", "Font size <12>"},
            {"cursor", "int", "Width of \"Cursor\" <3>"},
            {"indent", "int", "Indent value for text display in pixels <15>"},
            {"initx","int", "X-coord of \"Screen\" origin in applet panel <0>"},
            {"inity","int", "Y-coord of \"Screen\" origin in applet panel <0>"},
            {"bgimage", "String", "Background image file, relative to codebase <none>"},
            {"maxy","int","Lower limit of text display, zero uses applet height <0>"}
        };
        return info;
    }

    public String getAppletInfo()
    {
        return("HollywoodText Applet, Copyright 1997 by William Giel.");
    }


    public void init()
    {

        super.init();

        width=size().width;
        height=size().height;

        String param = getParameter("bgcolor");
        bgcolor = parseColorString(param, Color.black);

        param = getParameter("fgcolor");
        fgcolor = parseColorString(param, Color.green);

        param = getParameter("sound");
        sound = getClip(param);

        param = getParameter("cpause");
        cpause = getInt(param,25);

        param = getParameter("lpause");
        lpause = getInt(param,250);

        param = getParameter("spause");
        spause = getInt(param,500);

        param = getParameter("loop");
        loop = (getInt(param,1) > 0)? true : false;

        param = getParameter("lspace");
        lspace = getInt(param,15);

        param = getParameter("fontsize");
        fontsize = getInt(param,12);

        param = getParameter("cursor");
        cursor = getInt(param,3);

        param = getParameter("indent");
        indent = getInt(param,0);

        param = getParameter("initx");
        initx = getInt(param,0);

        indent += initx;

        param = getParameter("inity");
        inity = getInt(param,0);

        param = getParameter("maxy");
        maxy = getInt(param,height);


        param = getParameter("bgimage");
        if(null != param){
            try{
                bgimage = getImage(getCodeBase(),param);
                tracker = new MediaTracker(this);
                tracker.addImage(bgimage,0);
            }catch(Exception e){
                bgimage = null;
            }
        }

        file = getParameter("script");
        if(null == file){
            System.out.println("HollywoodText: No script was specified.");
            return;
        }

    }

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

    public void stop()
    {
        if(null != kicker){
            kicker.stop();
            kicker=null;
        }
    }

    private AudioClip getClip(String s)
    {
        AudioClip clip = null;
        try{
            URL url = new URL(getCodeBase(),s);
            clip = getAudioClip(url);
        }catch(Exception e){
            System.out.println(e);
            clip=null;
        }
        return clip;
    }

    private Color parseColorString(String colorString, Color dflt)
    {
        Color color;

        try{
            colorString = colorString.replace('#',' ').trim();
            int R = Integer.valueOf(colorString.substring(0,2),16).intValue();
            int G = Integer.valueOf(colorString.substring(2,4),16).intValue();
            int B = Integer.valueOf(colorString.substring(4,6),16).intValue();
            color = new Color(R,G,B);
        }catch(Exception e){
            color = dflt;
        }

        return color;
    }

    private int getInt(String s, int dflt)
    {
        int val;

        try{
            val = Integer.parseInt(s);
        }catch(Exception e){
            val = dflt;
        }
        return val;
    }

    private void getScript()
    {
        String textline;

        try{

             URLConnection urlConnection = new URL(getCodeBase(),file).openConnection();

             //In JDK 1.1, this should be replaced with BufferedReader.readLine, however
             //the following works with both 1.02 and 1.1...
             DataInputStream in = new DataInputStream(urlConnection.getInputStream());

             while(null != (textline = in.readLine())){
                script.addElement(textline.trim());
             }

        }catch (Exception e){
            script.removeAllElements();
            script.addElement("Could not retrieve script.");
        }
    }


    private void repaintScreen(Graphics g)
    {
        //We call this to refresh our buffered image
        //prior to typing text onto it...
        if(null == bgimage){
            g.setColor(bgcolor);
            g.fillRect(0, 0, width, height);
        }
        else{
            g.drawImage(bgimage,0,0,this);
        }
    }

    private int displayString(Graphics g, String string, int y, int w, int ascent)
    {
        //Step through the string, display each character with the sound effect
        //Paint a cursor as we do, and sleep for the character pause interval
        //in between each character.
        //
        //Return the Y coord for the next line of text.
        for(int j = 0; j < string.length(); j++){
            if(null != sound)
                sound.play();
            g.setColor(fgcolor);
            g.drawString(string.substring(j,j+1),indent + (j)*w, y);
            g.fillRect(indent + (j+1)*w, y-ascent, cursor, fontsize);
            try{
                kicker.sleep(cpause);
            }catch(InterruptedException e){}
            g.setColor(bgcolor);
            g.fillRect(indent + (j+1)*w, y-ascent, cursor, fontsize);
            repaint();
        }
        return y+lspace;

    }

    public void run()
    {
        //Wait for a background image, if any...
        if(null != bgimage){
            try{
                tracker.waitForAll();
            }catch(Exception e){
                bgimage = null;
            }
        }

        //Create our buffered image
        image= createImage(width, height);

        //Get the graphics context for the buffered image
        Graphics g = image.getGraphics();

        //Put it up...
        repaint();

        //Now, get the script (if necessary.)
        if(script.isEmpty())
            getScript();

        //Set a teletype font, and get some font metrics
        g.setFont(new Font("Courier", Font.PLAIN, fontsize));
        FontMetrics fm = g.getFontMetrics();
        int w = fm.stringWidth("A");
        int ascent = fm.getMaxAscent();

        //We've got our image and file, so we can now set isRunning to true.
        //This is used to see if we are ready to respond to mouseDown events
        //(see below)
        isRunning=true;

        while(kicker != null){

            repaintScreen(g);

            int Y = inity + lspace;

            for(int i = 0; i < script.size(); i++){

                String string = (String)script.elementAt(i);

                //Handle a NEWLINE "tag"
                if(string.toLowerCase().equals("<newline>")){
                    if(Y != inity + lspace)
                        Y += lspace;
                }

                //Handle a NEWPAGE "tag"
                else if(string.toLowerCase().equals("<newpage>")){
                    repaintScreen(g);
                    Y = inity + lspace;
                }

                //Handle a PAUSE "tag" (parse out the value) and sleep
                //for the requested duration
                else if(string.toLowerCase().startsWith("<pause")){
                    int pause;
                    int start=string.indexOf(" ");
                    int end = string.indexOf(">");
                    start++;
                    try{
                        pause=Integer.parseInt(string.substring(start,end));

                        if(pause == 0){
                            threadSuspended=true;
                            kicker.suspend();
                        }
                        else{
                            kicker.sleep(pause);
                        }
                    }catch(Exception e){}
                }

                //Otherwise, handle a message line.
                else{

                    if(string.toLowerCase().equals("<more>")){
                        string = MOREMESSAGE;
                    }

                    Y = displayString(g, string, Y, w, ascent);

                    //Are we near enough to the bottom of the display to
                    //show a "More..." (and is it appropriate, i.e. is
                    //there more text to display?)
                    if((Y + 2*lspace) > maxy && i+1 < script.size()){
                        Y+=lspace;
                        string=MOREMESSAGE;
                        displayString(g, string, Y, w, ascent);
                    }

                    //Did we just display "More..."?
                    if(string.equals(MOREMESSAGE)){
                        //This will force a new page after
                        //the thread resumes
                        Y += maxy;
                        threadSuspended=true;
                        kicker.suspend();
                    }

                    //Otherwise, if we simply displayed a text line,
                    //sleep for the line pause interval.
                    else{
                        try{
                            kicker.sleep(lpause);
                        }catch(InterruptedException e){}
                    }
                }
                //Do we need to start a new "Page?"
                if(Y > maxy){
                    repaintScreen(g);
                    Y = inity + lspace;
                }
            }

            //Is unattended looping enabled? If it is, sleep for
            //a screen pause interval.
            if(loop){
                try{
                   kicker.sleep(spause);
                }catch(InterruptedException e){}
            }

            //Otherwise, suspend until we get a mouseDown event
            else{
                threadSuspended=true;
                kicker.suspend();
            }
        }
    }

    public synchronized boolean mouseDown(java.awt.Event evt, int x, int y)
    {
        //Only respond to mouseDown if the applet has its image and file
        //and is running...
        if(isRunning){
            if (threadSuspended) {
                kicker.resume();
            }
            else {
                kicker.suspend();
            }
            threadSuspended = !threadSuspended;
        }
        return true;
    }


    public void paint(Graphics g)
    {
        //If we've got an image, draw it...
        if(null != image)
            g.drawImage(image,0,0,this);

        //Otherwise, paint the applet panel the specified
        //background color...
        else{
            g.setColor(bgcolor);
            g.fillRect(0,0,size().width,size().height);
        }
    }

    public void update(Graphics g)
    {
        //Override update to call our paint method
        //to eliminate flickering.
        paint(g);
    }

}