/*
 * Copyright 2012 - 2013 Anton Tananaev (anton.tananaev@gmail.com)
 *                       Luis Parada (luis.parada@gmail.com)
 *
 * Licensed 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.traccar.protocol;

import java.net.SocketAddress;
import java.util.Calendar; 
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.model.Position;

public class Ev603ProtocolDecoder extends BaseProtocolDecoder {

    public Ev603ProtocolDecoder(Ev603Protocol protocol) {
        super(protocol);
    }

    private static final Pattern pattern = Pattern.compile(
            "!.," +                           // Type
            "(\\d{2})/(\\d{2})/(\\d{2})," +   // Date dd/mm/YY
            "(\\d{2}):(\\d{2}):(\\d{2})," +   // Time hh:mm:ss
            "(-?\\d+\\.\\d+)," +              // Latitude
            "(-?\\d+\\.\\d+)," +              // Longitude
            "(\\d+\\.?\\d*)," +               // Speed
            "(\\d+\\.?\\d*)," +               // Course
            ".*");

    @Override
    protected Object decode(
            Channel channel, SocketAddress remoteAddress, Object msg)
            throws Exception {

        String sentence = (String) msg;

        // Detect device ID
        if (sentence.startsWith("!1,")) {

            identify(sentence.substring(3), channel);

        } else {

            // Parse message
            Matcher parser = pattern.matcher(sentence);
            if (!hasDeviceId() || !parser.matches()) {
                return null;
            }

            // Create new position
            Position position = new Position();
            position.setDeviceId(getDeviceId());
            position.setProtocol(getProtocolName());
            Integer index = 1;

            // Date
            Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
            time.clear();
            time.set(Calendar.DAY_OF_MONTH, Integer.valueOf(parser.group(index++)));
            time.set(Calendar.MONTH, Integer.valueOf(parser.group(index++)) - 1);
            time.set(Calendar.YEAR, 2000 + Integer.valueOf(parser.group(index++)));

            // Time
            time.set(Calendar.HOUR_OF_DAY, Integer.valueOf(parser.group(index++)));
            time.set(Calendar.MINUTE, Integer.valueOf(parser.group(index++)));
            time.set(Calendar.SECOND, Integer.valueOf(parser.group(index++)));
            position.setTime(time.getTime());

            // Validity
            position.setValid(true);

            // Coordinates
            position.setLatitude(Double.valueOf(parser.group(index++)));
            position.setLongitude(Double.valueOf(parser.group(index++)));

            // Speed
            position.setSpeed(Double.valueOf(parser.group(index++)));

            // Course
            position.setCourse(Double.valueOf(parser.group(index++)));
            if (position.getCourse() > 360) {
                position.setCourse(0);
            }
            return position;
        }

        return null;
    }
}