/*
 * Copyright 2011 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 static java.util.Calendar.*;

import java.util.Calendar;
import java.util.TimeZone;
import java.util.logging.Level;
import java.util.logging.Logger;

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;

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 = 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);
    }
}