package chiffre;

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
/**
 *
 *
 * @author Christian Semrau
 * <a href="mailto:Christian.Semrau@student.uni-magdeburg.de">
 * Christian.Semrau@student.uni-magdeburg.de</a>
 */
public class Chiffre extends Applet implements Runnable,
ActionListener, ItemListener, ChiffreInterface{
	String chiffreType;
	int coder; // aktuell ausgewaehlter Algorithmus
	// alle Algorithmen
	ChiffreInterface[] chiffre = new ChiffreInterface[20];
	// Statistik anzeigen oder nicht
	boolean showStat;

	// Schluessel des ChiffreInterface
	int key;
	// Schluessel gesetzt
	boolean set = false;

	// Thread, der die statistische Auswertung macht
	Thread kicker;
	// Objekt, das die Statistik uebernimmt
	Statistik st;

	TextField KlarText = new TextField(40);
	TextField GeheimText = new TextField(40);
	TextField SchluesselText = new TextField(10);
	Button FilternButton = new Button("Filtern");
	Button EncodeButton = new Button("Encode");
	Button DecodeButton = new Button("Decode");
	Button StatsButton = new Button("Stats");
	Choice Algorithmus = new Choice();
	TextArea StatsOne = new TextArea(5,10);
	TextArea StatsMore = new TextArea();
	TextArea StatsGGTs = new TextArea(5,10);
/**
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 *
 * @param obj java.awt.event.ActionEvent
 */
public void actionPerformed(ActionEvent event) {
	Object obj = event.getSource();
	if (obj instanceof Button){
		String action = event.getActionCommand();
		if (action.equals("Filtern")){
			KlarText.setText(filter(KlarText.getText()));
			GeheimText.setText(filter(GeheimText.getText()));
		}else
		if (action.equals("Encode")){
			if (coder>0){
				chiffre[coder].setKey(SchluesselText.getText());
				GeheimText.setText(chiffre[coder].encode(KlarText.getText()));
			}
		}else
		if (action.equals("Decode")){
			if (coder>0){
				chiffre[coder].setKey(SchluesselText.getText());
				KlarText.setText(chiffre[coder].decode(GeheimText.getText()));
			}
		}
		if (action.equals("Stats")){
			if (st!=null){
				kicker = null;
			}else{
				st = new Statistik(GeheimText.getText());
				StatsOne.setText("Geduld...");
				StatsMore.setText("Geduld...");
				StatsGGTs.setText("Geduld...");
				kicker = new Thread(this);
				kicker.start();
			}
		}
	}
}
/*
 * Implementiert einen Caesar-aehnlichen Verschluesselungs-Algorithmus.
 * Es wird das Alphabet umgedreht und dann mit einem Schluessel verschoben.
*/
public String decode(String s) {
	return encode(s);
}
/*
 * Implementiert einen Caesar-aehnlichen Verschluesselungs-Algorithmus.
 * Es wird das Alphabet umgedreht und dann mit einem Schluessel verschoben.
*/
public String encode(String s) {
	int k=key;
	if (!set) return "";
	char[] geheim = new char[s.length()];
	for (int i=0; i<s.length(); i++){
		char klar = s.charAt(i);
		char code;
		if (klar>='a' && klar<='z'){
			code = (char)(('z'-klar+k)%26 +'a');
		}else
		if (klar>='A' && klar<='Z'){
			code = (char)(('Z'-klar+k)%26+'A');
		}else
			code = klar;
		geheim[i] = code;
	}
	return new String(geheim);
}

/**
 * Liefert einen String, der nur die Buchstaben (klein) von s enthaelt.
 */
public static String filter(String s) {
  String chars =
  // enthaelt alle Zeichen, die der Filter "durchlassen" soll
	"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz";
  String f = "";
  char c;
  for (int i = 0; i < s.length(); )
	if (chars.indexOf(c=s.charAt(i++))>=0)
	  f += c;
  return f.toLowerCase();
}
/**
 * Returns information about this applet.
 * @return a string of information about this applet
 */
public String getAppletInfo() {
	return
		"ChiffreApplet\n" +
		"by Christian Semrau, 06.02.2000\n" + 
		"Christian.Semrau@student.uni-magdeburg.de";
}
/**
 * 
 * @param s java.lang.String
 */
public static ChiffreInterface getCoder(String s) {
	if (s==null||s.length()<=0) return null;
	if (s.equals("-")) return null;
	try{
		return (ChiffreInterface)(Class.forName(s).newInstance());
	}catch(InstantiationException e){
	}catch(ClassCastException e){
	}catch(IllegalAccessException e){
	}catch(ClassNotFoundException e){
	}
	return null;
}
/**
 * Returns parameters defined by this applet.
 * @return an array of descriptions of the receiver's parameters
 */
public java.lang.String[][] getParameterInfo() {
	String[][] info = {
		{"ChiffreTypeN", "String", "Klassen-Name des Algorithmus (N=1..20)"},
		{"Statistik","boolean","Statistik anzeigen (true/false)"+
			" [height mit: 350, ohne: 150]"}
	};
	return info;
}
/**
 * Initializes the applet.
 * 
 * @see #start
 * @see #stop
 * @see #destroy
 */
public void init() {
	super.init();

	showStat = "true".equalsIgnoreCase(getParameter("Statistik"));
	kicker = null;
	st = null;

	GridBagLayout gbl = new GridBagLayout();
	GridBagConstraints gbc;
	Label label;
	setLayout(gbl);

	// Auswahlliste
	Algorithmus.add("-");
	int alg = 1; // Nummer des naechsten "ChiffreType"-Parameters
	int ch = 1; // Anzahl der gefundenen ChiffreInterfaces
	String s;
	do{
		s = getParameter("ChiffreType"+(alg++));
		ChiffreInterface cI = getCoder(s);
		if (cI!=null){
			chiffre[ch++] = cI;
			Algorithmus.add(s);
		}
	}while (s != null || alg>=chiffre.length);
/*
	{
		s = "chiffre.ChiffreApplet";
		ChiffreInterface cI = getCoder(s);
		if (cI!=null){
			chiffre[ch++] = cI;
			Algorithmus.add(s);
		}
	}
*/
	coder = (ch>1)?1:0;

	gbc = makegbc(0,0,1,1,GridBagConstraints.HORIZONTAL);
	gbl.setConstraints(Algorithmus, gbc);
	add(Algorithmus);
	Algorithmus.select(coder);
	Algorithmus.addItemListener(this);

	// Textfelder und Buttons
	Panel pane = new Panel();
//	pane.setLayout(new GridLayout(1,3));
	pane.add(FilternButton);
	FilternButton.addActionListener(this);
	pane.add(EncodeButton);
	EncodeButton.addActionListener(this);
	pane.add(DecodeButton);
	DecodeButton.addActionListener(this);
	if (showStat){
		pane.add(StatsButton);
		StatsButton.addActionListener(this);
	}
	gbc = makegbc(1,0,1,1,GridBagConstraints.NONE);
	gbc.anchor = GridBagConstraints.WEST;
//	gbc.weightx = 100;
	gbl.setConstraints(pane, gbc);
	add(pane);

	label = new Label("Christian Semrau");
	gbc = makegbc(2,0,1,1,GridBagConstraints.NONE);
	gbc.anchor = GridBagConstraints.EAST;
	gbc.weightx = 100;
	gbl.setConstraints(label, gbc);
	add(label);

	label = new Label("Klartext:");
	gbc = makegbc(0,1,1,1,GridBagConstraints.NONE);
	gbc.anchor = GridBagConstraints.EAST;
	gbl.setConstraints(label, gbc);
	add(label);

	label = new Label("Geheimtext:");
	gbc = makegbc(0,2,1,1,GridBagConstraints.NONE);
	gbc.anchor = GridBagConstraints.EAST;
	gbl.setConstraints(label, gbc);
	add(label);

	label = new Label("Schluessel:");
	gbc = makegbc(0,3,1,1,GridBagConstraints.NONE);
	gbc.anchor = GridBagConstraints.EAST;
	gbl.setConstraints(label, gbc);
	add(label);

	gbc = makegbc(1,1,2,1,GridBagConstraints.HORIZONTAL);
	gbl.setConstraints(KlarText, gbc);
	add(KlarText);

	gbc = makegbc(1,2,2,1,GridBagConstraints.HORIZONTAL);
	gbl.setConstraints(GeheimText, gbc);
	add(GeheimText);

	gbc = makegbc(1,3,2,1,GridBagConstraints.HORIZONTAL);
	gbl.setConstraints(SchluesselText, gbc);
	add(SchluesselText);

	if (showStat){
		gbc = makegbc(0,4,1,1,GridBagConstraints.VERTICAL);
		gbl.setConstraints(StatsOne, gbc);
		add(StatsOne);

		pane = new Panel();
		pane.setLayout(new BorderLayout());
		pane.add("Center",StatsMore);
		pane.add("East",StatsGGTs);
	
		gbc = makegbc(1,4,2,1,GridBagConstraints.BOTH);
		gbc.weightx = 100;
		gbc.weighty = 100;
		gbl.setConstraints(pane, gbc);
		add(pane);
		// konfigurieren
		StatsOne.setEditable(false);
		StatsMore.setEditable(false);
		StatsGGTs.setEditable(false);
		int points = StatsMore.getFont().getSize();
		Font f = new Font("Monospaced",Font.PLAIN,points);
		StatsOne.setFont(f);
		StatsMore.setFont(f);
		StatsGGTs.setFont(f);
	}
	int points = KlarText.getFont().getSize();
	Font f = new Font("Monospaced",Font.PLAIN,points);
	KlarText.setFont(f);
	GeheimText.setFont(f);
	SchluesselText.setFont(f);
}
/**
 * 
 * @param event java.awt.event.ItemEvent
 */
public void itemStateChanged(ItemEvent event) {
	Object obj = event.getSource();
	if (obj == Algorithmus){
		coder = Algorithmus.getSelectedIndex();
		SchluesselText.setText("");
	}
}
/**
 * 
 * @return java.awt.GridBagConstraints
 * @param x int
 * @param y int
 * @param w int
 * @param h int
 */
public static GridBagConstraints makegbc(int x, int y, int w, int h, int fill) {
	GridBagConstraints gbc = new GridBagConstraints();
	gbc.gridx = x;
	gbc.gridy = y;
	gbc.gridwidth = w;
	gbc.gridheight = h;
	gbc.fill = fill;
	gbc.insets = new Insets(1, 1, 1, 1);
	return gbc;
}
/**
 * 
 */
public void run() {
	Thread me = Thread.currentThread();
	boolean finished = false;
	while(kicker == me){
		if (!st.calculate()){
			StatsOne.setText(st.getOnes());
			StatsMore.setText(st.getSorted());
			StatsGGTs.setText(st.getGGTs());
			kicker = null;
			finished = true;
		}else{
			int perc = st.percDone();
			StatsMore.setText("Geduld...\n"+perc);
			try{
				Thread.sleep(100);
			}catch(InterruptedException e){
			}
		}
	}
	st = null;
	if (!finished){
			StatsOne.setText("");
			StatsMore.setText("");
			StatsGGTs.setText("");
	}
}
/**
 * setKey method comment.
 */
public void setKey(String s) {
	if (s==null||s.length()<=0){ set = false; return; }
	if (Character.isLetter(s.charAt(0))){
		key = (Character.toLowerCase(s.charAt(0))-'a');
		set = true;
		return;
	}
	try{
		key = (new Integer(s).intValue()%26);
		set = true;
		while (key<0) key+=26;
	}catch(NumberFormatException e){
		set = false;
	}
}
/**
 * 
 */
public void start() {
	KlarText.setText("");
	String s = getParameter("Geheimtext");
	if (s==null||s.length()<=0)
		GeheimText.setText("");
	else
		GeheimText.setText(s);
	SchluesselText.setText("");
	coder = (Algorithmus.getItemCount()>0)?1:0;
	Algorithmus.select(coder);
	if (showStat){
		StatsOne.setText("");
		StatsMore.setText("");
		StatsGGTs.setText("");
	}
}
/**
 * 
 */
public void stop() {
	kicker = null;
}
}