import java.io.*;
import java.net.*;


public class ChatServer {

   int current = 0;
   String [] lines = new String [256];
   ServerSocket serverSocket;

   public ChatServer (int port) throws IOException {
    serverSocket = new ServerSocket (port);
    System.out.println ("Serving port: "+port);
   }


   public void run () {
    while (true) {
        try {
         Socket socket = serverSocket.accept ();
         handleRequest  (new BufferedReader
             (new InputStreamReader (socket.getInputStream ())),
                     new OutputStreamWriter (socket.getOutputStream ()));
         socket.close ();
        }
        catch (Exception e) {
         e.printStackTrace (System.err);
        }
    }
   }



   public void handleRequest (BufferedReader reader,
                     Writer writer) throws IOException {

    // analyze request line

    String request = reader.readLine ();
    System.out.println ("handling: "+request);
    int s0 = request.indexOf (' ');
    int s1 = request.indexOf (' ', s0+1);

    String method = request.substring (0, s0);
    String address = request.substring (s0+1, s1);

    // determine first line

    int start = current - 20;  // default;
    int cut = address.indexOf ("?start=");

    if (cut != -1)
        start = Integer.parseInt (address.substring (cut+7));


    // skip headers

    while (true) {
        String s = reader.readLine ();
        System.out.println ("header: "+s);
        if (s == null || s.length () == 0) break;
    }

    // in case of post, store given string

    if (method.equalsIgnoreCase ("post")) {

        String nick = reader.readLine ().substring (5);
        String text = reader.readLine ().substring (5);
        String score = reader.readLine ().substring (6);


         try {
        int i = Integer.parseInt(score.trim());
        int entry = Integer.parseInt(text.trim());
        System.out.println("int i = " + i);

         if (entry == 1)
         {
               int newScore = i - 10;
               String Nscore = Integer.toString(newScore);
               String msg = "Fiercely attacks its opponent!";
            System.out.println ("score="+Nscore);
            lines [(current++) % lines.length] = nick + " " + msg + "Score: " +Nscore;
         }