/*
    * 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 io.netty.example.worldclock;
  
  import io.netty.bootstrap.Bootstrap;
  import io.netty.channel.Channel;
  import io.netty.channel.EventLoopGroup;
  import io.netty.channel.nio.NioEventLoopGroup;
  import io.netty.channel.socket.nio.NioSocketChannel;
  import io.netty.handler.ssl.SslContext;
  import io.netty.handler.ssl.SslContextBuilder;
  import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
  
  import java.util.Arrays;
  import java.util.List;
  
  /**
   * Sends a list of continent/city pairs to a {@link WorldClockServer} to
   * get the local times of the specified cities.
   */
  public final class WorldClockClient {
  
      static final boolean SSL = System.getProperty("ssl") != null;
      static final String HOST = System.getProperty("host", "127.0.0.1");
      static final int PORT = Integer.parseInt(System.getProperty("port", "8463"));
      static final List<String> CITIES = Arrays.asList(System.getProperty(
              "cities", "Asia/Seoul,Europe/Berlin,America/Los_Angeles").split(","));
  
      public static void main(String[] args) throws Exception {
          // Configure SSL.
          final SslContext sslCtx;
          if (SSL) {
              sslCtx = SslContextBuilder.forClient()
                  .trustManager(InsecureTrustManagerFactory.INSTANCE).build();
          } else {
              sslCtx = null;
          }
  
          EventLoopGroup group = new NioEventLoopGroup();
          try {
              Bootstrap b = new Bootstrap();
              b.group(group)
               .channel(NioSocketChannel.class)
               .handler(new WorldClockClientInitializer(sslCtx));
  
              // Make a new connection.
              Channel ch = b.connect(HOST, PORT).sync().channel();
  
              // Get the handler instance to initiate the request.
              WorldClockClientHandler handler = ch.pipeline().get(WorldClockClientHandler.class);
  
              // Request and get the response.
              List<String> response = handler.getLocalTimes(CITIES);
  
              // Close the connection.
              ch.close();
  
              // Print the response at last but not least.
              for (int i = 0; i < CITIES.size(); i ++) {
                  System.out.format("%28s: %s%n", CITIES.get(i), response.get(i));
              }
          } finally {
              group.shutdownGracefully();
          }
      }
  }