/*
    * junixsocket
    *
    * Copyright 2009-2024 Christian Kohlschütter
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.newsclub.net.unix.demo.server;
  
  import java.io.IOException;
  import java.net.ServerSocket;
  import java.net.Socket;
  import java.net.SocketAddress;
  import java.net.SocketException;
  import java.util.concurrent.Future;
  
  import org.newsclub.net.unix.AFSocketAddress;
  import org.newsclub.net.unix.AFUNIXSocket;
  import org.newsclub.net.unix.server.SocketServer;
  
  /**
   * An {@link SocketServer} that's just good for demo purposes.
   *
   * @author Christian Kohlschütter
   */
  @SuppressWarnings("CatchAndPrintStackTrace" /* errorprone */)
  abstract class DemoServerBase extends SocketServer<SocketAddress, Socket, ServerSocket> {
    public DemoServerBase(SocketAddress listenAddress) {
      super(listenAddress);
    }
  
    private static String millisToHumanReadable(int millis, String zeroValue) {
      if (millis == 0 && zeroValue != null) {
        return "0 [ms] (" + zeroValue + ")";
      } else {
        float secs = millis / 1000f;
        if ((secs - (int) secs) == 0) {
          return millis + " [ms] == " + (int) (secs) + "s";
        } else {
          return millis + " [ms] == " + secs + "s";
        }
      }
    }
  
    @Override
    protected void onServerStarting() {
      System.out.println();
      System.out.println("Creating server: " + getClass().getName());
      System.out.println("with the following configuration:");
      System.out.println("- maxConcurrentConnections: " + getMaxConcurrentConnections());
      System.out.println("- serverTimeout: " + millisToHumanReadable(getServerTimeout(), "none"));
      System.out.println("- socketTimeout: " + millisToHumanReadable(getSocketTimeout(), "none"));
      System.out.println("- serverBusyTimeout: " + millisToHumanReadable(getServerBusyTimeout(),
          "none"));
    }
  
    @Override
    protected void onServerBound(SocketAddress address) {
      System.out.println("Created server -- bound to " + address);
    }
  
    @Override
    protected void onServerBusy(long busySince) {
      System.out.println("Server is busy");
    }
  
    @Override
    protected void onServerReady(int activeCount) {
      System.out.println("Active connections: " + activeCount
          + "; waiting for the next connection...");
    }
  
    @Override
    protected void onServerStopped(ServerSocket theServerSocket) {
      System.out.println("Close server " + theServerSocket);
    }
  
    @Override
    protected void onSubmitted(Socket socket, Future<?> submit) {
      System.out.println("Accepted: " + socket);
    }
  
    @Override
    protected void onBeforeServingSocket(Socket socket) {
      System.out.println("Serving socket: " + socket);
      if (socket instanceof AFUNIXSocket) {
        try {
          System.out.println("Client's credentials: " + ((AFUNIXSocket) socket).getPeerCredentials());
        } catch (IOException e) {
         e.printStackTrace();
       }
     }
   }
 
   @Override
   protected void onServerShuttingDown() {
     System.out.println("Nothing going on for a long time, I better stop listening");
   }
 
   @Override
   protected void onSocketExceptionDuringAccept(SocketException e) {
     e.printStackTrace();
   }
 
   @Override
   protected void onSocketExceptionAfterAccept(Socket socket, SocketException e) {
     System.out.println("Closed (not executed): " + socket);
   }
 
   @Override
   protected void onServingException(Socket socket, Throwable t) {
     if (socket.isClosed()) {
       // "Broken pipe", etc.
       System.out.println("The other end disconnected (" + t.getMessage() + "): " + socket);
       return;
     }
     System.err.println("Exception thrown in " + socket + ", connected: " + socket.isConnected()
         + ", " + socket.isBound() + "," + socket.isClosed() + "," + socket.isInputShutdown() + ","
         + socket.isOutputShutdown());
     t.printStackTrace();
   }
 
   @Override
   protected void onAfterServingSocket(Socket socket) {
     System.out.println("Closed: " + socket);
   }
 
   @Override
   protected void onListenException(Exception e) {
     e.printStackTrace();
   }
 
   @Override
   protected ServerSocket newServerSocket() throws IOException {
     SocketAddress listenAddress = getListenAddress();
     if (listenAddress instanceof AFSocketAddress) {
       return ((AFSocketAddress) listenAddress).getAddressFamily().newServerSocket();
     } else {
       return new ServerSocket();
     }
   }
 }