/*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project licenses this file to you 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.jboss.netty.example.telnet;
  
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.net.InetSocketAddress;
  import java.util.concurrent.Executors;
  
  import org.jboss.netty.bootstrap.ClientBootstrap;
  import org.jboss.netty.channel.Channel;
  import org.jboss.netty.channel.ChannelFuture;
  import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory;
  
  /**
   * Simplistic telnet client.
   */
  public class TelnetClient {
  
      private final String host;
      private final int port;
  
      public TelnetClient(String host, int port) {
          this.host = host;
          this.port = port;
      }
  
      public void run() throws IOException {
          // Configure the client.
          ClientBootstrap bootstrap = new ClientBootstrap(
                  new NioClientSocketChannelFactory(
                          Executors.newCachedThreadPool(),
                          Executors.newCachedThreadPool()));
  
          // Configure the pipeline factory.
          bootstrap.setPipelineFactory(new TelnetClientPipelineFactory());
  
          // Start the connection attempt.
          ChannelFuture future = bootstrap.connect(new InetSocketAddress(host, port));
  
          // Wait until the connection attempt succeeds or fails.
          Channel channel = future.awaitUninterruptibly().getChannel();
          if (!future.isSuccess()) {
              future.getCause().printStackTrace();
              bootstrap.releaseExternalResources();
              return;
          }
  
          // Read commands from the stdin.
          ChannelFuture lastWriteFuture = null;
          BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
          for (;;) {
              String line = in.readLine();
              if (line == null) {
                  break;
              }
  
              // Sends the received line to the server.
              lastWriteFuture = channel.write(line + "\r\n");
  
              // If user typed the 'bye' command, wait until the server closes
              // the connection.
              if (line.toLowerCase().equals("bye")) {
                  channel.getCloseFuture().awaitUninterruptibly();
                  break;
              }
          }
  
          // Wait until all messages are flushed before closing the channel.
          if (lastWriteFuture != null) {
              lastWriteFuture.awaitUninterruptibly();
          }
  
          // Close the connection.  Make sure the close operation ends because
          // all I/O operations are asynchronous in Netty.
          channel.close().awaitUninterruptibly();
  
          // Shut down all thread pools to exit.
          bootstrap.releaseExternalResources();
      }
  
      public static void main(String[] args) throws Exception {
          // Print usage if no argument is specified.
          if (args.length != 2) {
              System.err.println(
                     "Usage: " + TelnetClient.class.getSimpleName() +
                     " <host> <port>");
             return;
         }
 
         // Parse options.
         String host = args[0];
         int port = Integer.parseInt(args[1]);
 
         new TelnetClient(host, port).run();
     }
 }