/*
    * 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.localtime;
  
  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;
  
  import java.net.InetSocketAddress;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Iterator;
  import java.util.List;
  import java.util.concurrent.Executors;
  import java.util.regex.Pattern;
  
  /**
   * Sends a list of continent/city pairs to a {@link LocalTimeServer} to
   * get the local times of the specified cities.
   */
  public class LocalTimeClient {
  
      private final String host;
      private final int port;
      private final Collection<String> cities;
  
      public LocalTimeClient(String host, int port, Collection<String> cities) {
          this.host = host;
          this.port = port;
          this.cities = new ArrayList<String>();
          this.cities.addAll(cities);
      }
  
      public void run() {
          // Set up.
          ClientBootstrap bootstrap = new ClientBootstrap(
                  new NioClientSocketChannelFactory(
                          Executors.newCachedThreadPool(),
                          Executors.newCachedThreadPool()));
  
          // Configure the event pipeline factory.
          bootstrap.setPipelineFactory(new LocalTimeClientPipelineFactory());
  
          // Make a new connection.
          ChannelFuture connectFuture =
              bootstrap.connect(new InetSocketAddress(host, port));
  
          // Wait until the connection is made successfully.
          Channel channel = connectFuture.awaitUninterruptibly().getChannel();
  
          // Get the handler instance to initiate the request.
          LocalTimeClientHandler handler =
              channel.getPipeline().get(LocalTimeClientHandler.class);
  
          // Request and get the response.
          List<String> response = handler.getLocalTimes(cities);
          // Close the connection.
          channel.close().awaitUninterruptibly();
  
          // Shut down all thread pools to exit.
          bootstrap.releaseExternalResources();
  
          // Print the response at last but not least.
          Iterator<String> i1 = cities.iterator();
          Iterator<String> i2 = response.iterator();
          while (i1.hasNext()) {
              System.out.format("%28s: %s%n", i1.next(), i2.next());
          }
      }
  
      public static void main(String[] args) throws Exception {
          // Print usage if necessary.
          if (args.length < 3) {
              printUsage();
              return;
          }
  
          // Parse options.
          String host = args[0];
          int port = Integer.parseInt(args[1]);
          Collection<String> cities = parseCities(args, 2);
          if (cities == null) {
              return;
          }
  
         new LocalTimeClient(host, port, cities).run();
     }
 
     private static void printUsage() {
         System.err.println(
                 "Usage: " + LocalTimeClient.class.getSimpleName() +
                 " <host> <port> <continent/city_name> ...");
         System.err.println(
                 "Example: " + LocalTimeClient.class.getSimpleName() +
                 " localhost 8080 America/New_York Asia/Seoul");
     }
 
     private static final Pattern CITY_PATTERN = Pattern.compile("^[_A-Za-z]+/[_A-Za-z]+$");
 
     private static List<String> parseCities(String[] args, int offset) {
         List<String> cities = new ArrayList<String>();
         for (int i = offset; i < args.length; i ++) {
             if (!CITY_PATTERN.matcher(args[i]).matches()) {
                 System.err.println("Syntax error: '" + args[i] + '\'');
                 printUsage();
                 return null;
             }
             cities.add(args[i].trim());
         }
         return cities;
     }
 }