import java.net.*; import java.io.*; import java.util.*;
public class NameServer {
    NameTable table;
    public NameServer() {
        table = new NameTable();
    }
    void handleclient(Socket theClient) {
        try {
            BufferedReader din = new BufferedReader
            (new InputStreamReader(theClient.getInputStream()));
            PrintWriter pout = new PrintWriter(theClient.getOutputStream());
            String command = din.readLine();
            System.out.println("received:" + command);
            StringTokenizer st = new StringTokenizer(command);
            String tag = st.nextToken();
            if (tag.equals("search")) {
                InetSocketAddress entry = table.search(st.nextToken());
                if (entry == null) pout.println(0 + " " + "nullhost");
                else pout.println(entry.getPort() + " " + entry.getHostName());
            } else if (tag.equals("insert")) {
                String name = st.nextToken();
                String hostName = st.nextToken();
                int port = Integer.parseInt(st.nextToken());
                int retValue = table.insert(name, hostName, port);
                pout.println(retValue);
            } else if (tag.equals("clear")) {
                table.clear();
            }
            pout.flush();
        } catch (IOException e) {
            System.err.println(e);
        }
    }
    public static void main(String[] args) {
        NameServer ns = new NameServer();
        System.out.println("NameServer started:");
        try {
            ServerSocket listener = new ServerSocket(Symbols.ServerPort);
            while (true) {
                Socket aClient = listener.accept();
                ns.handleclient(aClient);
                aClient.close();
            }
        } catch (IOException e) {
            System.err.println("Server aborted:" + e);
        }
    }
}