import java.io.IOException;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;

@WebServlet("/chat")
@ServerEndpoint(value = "/chat")
public class chat extends HttpServlet {
	private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
	private static ArrayList<Session> sesije;
	private static String ceoChat="";
    public chat() {

        super();
     if(sesije==null)   sesije = new ArrayList<>();
        // TODO Auto-generated constructor stub
    }

    private static final Logger LOGGER =
            Logger.getLogger(chat.class.getName());

    @OnOpen
    public synchronized void onOpen(Session session) throws IOException {
    	System.out.println("DODAT KORISNIK");
    	sesije.add(session);
        LOGGER.log(Level.INFO, "New connection with client: {0}",
                session.getId());
        for (Session sess : sesije) {
        	System.out.println(sess.getId());
    		sess.getBasicRemote().sendText(ceoChat);
    		}
    }

    @OnMessage
    public String onMessage(String message, Session session) throws IOException {

        LOGGER.log(Level.INFO, "New message from Client [{0}]: {1}",
                new Object[] {session.getId(), message});
        ceoChat+= message+"<br>";

        System.out.println("BROJ SESIJA "+sesije.size());
        System.out.println(ceoChat);
        for (Session sess : sesije) {
		sess.getBasicRemote().sendText(ceoChat);
		}
        return ceoChat;
    }

    @OnClose
    public void onClose(Session session) {
        LOGGER.log(Level.INFO, "Close connection for client: {0}",
                session.getId());
    }

    @OnError
    public void onError(Throwable exception, Session session) {
        LOGGER.log(Level.INFO, "Error for client: {0}", session.getId());

}
}