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

public class ChatApplet extends Applet implements Runnable {
    TextArea text; 
    Label label;
    TextField input;
    Thread thread; 
    String user; 
    public void init() {
	URL codebase = getCodeBase(); 
	user = getParameter("user"); 
	if (user == null) user = "anonymous";
	text = new TextArea(); 
        text.setEditable(false); 
	label = new Label("Type here: "); 
	input = new TextField(); 
	input.setEditable(true); 
	setLayout(new BorderLayout());
	add("Center", text); 
	Panel panel = new Panel();
	panel.setLayout(new BorderLayout());
	panel.add("West", label); 
	panel.add("Center", input); 
	add("South",  panel); 
        text.appendText("URL: " + codebase + "\n"); 
    }
    public void start() {
	thread = new Thread(this); 
	thread.start(); 
    }
    public void run() {
	while (true) {
	    text.appendText(contactServer()); 
	}
    }
    public boolean handleEvent(Event event) {
        switch (event.id) {
  	    case Event.ACTION_EVENT:
	        if (event.target == input) {
		    broadcastMessage(input.getText() + "\n"); 
		    input.setText(""); 
                    return true; 
	        }
	}
	return false; 
    } 
    void broadcastMessage(String message) {
	message = user + ": " + message;
	try {
	    URL url          = 
              new URL("http://silo.cs.indiana.edu:57960/chat/servlet/ChatServlet");
	    HttpMessage msg  = new HttpMessage(url);
	    Properties props = new Properties();
	    props.put("message", message);
	    msg.sendPostMessage(props); 
	} catch (Exception ignored) { } 
    } 
    String contactServer() {
        String nextMessage = null;
	try {
	    URL servlet          = 
              new URL("http://silo.cs.indiana.edu:57960/chat/servlet/ChatServlet"); 
            HttpMessage msg      = new HttpMessage(servlet); 
            InputStream in       = msg.sendGetMessage(); 
            DataInputStream data = new DataInputStream(new BufferedInputStream(in)); 
            nextMessage          = data.readLine();    
	} catch (Exception e) {
            try {
		Thread.sleep(5000); 
	    } catch (InterruptedException ignored) { }
	}
        return nextMessage + "\n"; 
    } 
}