/*
 * Copyright 2012 Anton Tananaev (anton.tananaev@gmail.com)
 * Enhancement done by 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.util.Calendar;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.traccar.GenericProtocolDecoder;
import org.traccar.model.DataManager;
import org.traccar.model.Position;

/**
 *
 * Ev603 Protocol Decoder
 */
public class Ev603ProtocolDecoder extends GenericProtocolDecoder{
    
    /**
     * Initialize
     */
    public Ev603ProtocolDecoder(DataManager dataManager, Integer resetDelay) {
        super(dataManager, resetDelay);
    }
    
    /**
     * Regular expressions pattern
     */
    static private Pattern pattern = Pattern.compile(
            "!A," +                              // Start Character
            "([\\d]{2})\\/([\\d]{2})\\/([\\d]{2})," +   // Date dd/mm/YY
            "([\\d]{2}):([\\d]{2}):([\\d]{2})," +       // Time hh:mm:ss
            "(-?[\\d]{2})([\\d]{2}.[\\d]{4})," +  // Latitude (DDMM.MMMM)
            "(-?[\\d]{3})([\\d]{2}.[\\d]{4})," +  // Longitude (DDDMM.MMMM)
            "([\\d]+.[\\d]{2})," +              // Speed
            "([\\d]{2-3}+.[\\d]{1-3})," +       // degrees
            ".*");
    
    static private Pattern deviceImei = Pattern.compile("([\\d]+);");

    /**
     * Decode message
     */
    protected Object decode(
            ChannelHandlerContext ctx, Channel channel, Object msg)
            throws Exception {

        String sentence = (String) msg;

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

        // Create new position
        Position position = new Position();
        StringBuilder extendedInfo = new StringBuilder("<protocol>ev603</protocol>");

        // Get imei from First message
        if (sentence.contains("!1,")) {
            Matcher imeiparser = deviceImei.matcher(sentence);
            if (!imeiparser.matches()){
                return null;
            }else{
                String imei = imeiparser.group(1);
                position.setDeviceId(getDataManager().getDeviceByImei(imei).getId());
            }
        }
        
        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, 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);

        // Latitude
        Double latitude = Double.valueOf(parser.group(index++));
        latitude += Double.valueOf(parser.group(index++)) / 60;
        position.setLatitude(latitude);

        // Longitude
        Double lonlitude = Double.valueOf(parser.group(index++));
        lonlitude += Double.valueOf(parser.group(index++)) / 60;
        position.setLongitude(lonlitude);

        // Altitude
        position.setAltitude(0.0);

        // Speed
        position.setSpeed(Double.valueOf(parser.group(index++)));
        position.setCourse(0.0);

        // Extended info
        extendedInfo.append("<course>");
        extendedInfo.append(parser.group(index++));
        extendedInfo.append("</course>");

        return position;
    }
}