/*
    * 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.channel.ChannelEvent;
  import org.jboss.netty.channel.ChannelHandlerContext;
  import org.jboss.netty.channel.ChannelStateEvent;
  import org.jboss.netty.channel.ExceptionEvent;
  import org.jboss.netty.channel.MessageEvent;
  import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
  import org.jboss.netty.example.localtime.LocalTimeProtocol.Continent;
  import org.jboss.netty.example.localtime.LocalTimeProtocol.DayOfWeek;
  import org.jboss.netty.example.localtime.LocalTimeProtocol.LocalTime;
  import org.jboss.netty.example.localtime.LocalTimeProtocol.LocalTimes;
  import org.jboss.netty.example.localtime.LocalTimeProtocol.Location;
  import org.jboss.netty.example.localtime.LocalTimeProtocol.Locations;
  
  import java.util.Calendar;
  import java.util.TimeZone;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  
  import static java.util.Calendar.*;
  
  public class LocalTimeServerHandler extends SimpleChannelUpstreamHandler {
  
      private static final Logger logger = Logger.getLogger(
              LocalTimeServerHandler.class.getName());
  
      @Override
      public void handleUpstream(
              ChannelHandlerContext ctx, ChannelEvent e) throws Exception {
          if (e instanceof ChannelStateEvent) {
              logger.info(e.toString());
          }
          super.handleUpstream(ctx, e);
      }
  
      @Override
      public void messageReceived(
              ChannelHandlerContext ctx, MessageEvent e) {
  
          Locations locations = (Locations) e.getMessage();
          long currentTime = System.currentTimeMillis();
  
          LocalTimes.Builder builder = LocalTimes.newBuilder();
          for (Location l: locations.getLocationList()) {
              TimeZone tz = TimeZone.getTimeZone(
                      toString(l.getContinent()) + '/' + l.getCity());
              Calendar calendar = getInstance(tz);
              calendar.setTimeInMillis(currentTime);
  
              builder.addLocalTime(LocalTime.newBuilder().
                      setYear(calendar.get(YEAR)).
                      setMonth(calendar.get(MONTH) + 1).
                      setDayOfMonth(calendar.get(DAY_OF_MONTH)).
                      setDayOfWeek(DayOfWeek.valueOf(calendar.get(DAY_OF_WEEK))).
                      setHour(calendar.get(HOUR_OF_DAY)).
                      setMinute(calendar.get(MINUTE)).
                      setSecond(calendar.get(SECOND)).build());
          }
  
          e.getChannel().write(builder.build());
      }
  
      @Override
      public void exceptionCaught(
              ChannelHandlerContext ctx, ExceptionEvent e) {
          logger.log(
                  Level.WARNING,
                  "Unexpected exception from downstream.",
                  e.getCause());
          e.getChannel().close();
      }
  
      private static String toString(Continent c) {
          return c.name().charAt(0) + c.name().toLowerCase().substring(1);
      }
  }