/*
 * Copyright 2013 Anton Tananaev (anton.tananaev@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.BaseProtocolDecoder;
import org.traccar.ServerManager;
import org.traccar.helper.Log;
import org.traccar.model.ExtendedInfoFormatter;
import org.traccar.model.Position;

public class SuntechProtocolDecoder extends BaseProtocolDecoder {

    public SuntechProtocolDecoder(ServerManager serverManager) {
        super(serverManager);
    }

    static private Pattern pattern = Pattern.compile(
            "S.\\d{3}(?:\\w{3})?;" +       // Header
            "(?:[^;]+;)?" +
            "(\\d{6});" +                  // Device ID
            "(\\d+);" +                    // Version
            "(\\d{4})(\\d{2})(\\d{2});" +  // Date (YYYYMMDD)
            "(\\d{2}):(\\d{2}):(\\d{2});" + // Time (HH:MM:SS)
            "(?:(\\p{XDigit}+);)?" +       // Cell
            "([-\\+]\\d{2}.\\d+);" +       // Latitude
            "([-\\+]\\d{3}.\\d+);" +       // Longitude
            "(\\d{3}.\\d{3});" +           // Speed
            "(\\d{3}.\\d{2});" +           // Course
            ".*");                         // Full format

    @Override
    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();
        ExtendedInfoFormatter extendedInfo = new ExtendedInfoFormatter("suntech");
        int index = 1;

        // Identifier
        String imei = parser.group(index++);
        try {
            position.setDeviceId(getDataManager().getDeviceByImei(imei).getId());
        } catch(Exception error) {
            Log.warning("Unknown device - " + imei);
            return null;
        }
        
        // Version
        extendedInfo.set("version", parser.group(index++));

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

        // Coordinates
        position.setLatitude(Double.valueOf(parser.group(index++)));
        position.setLongitude(Double.valueOf(parser.group(index++)));
        position.setValid(true); // wrong?

        // Speed
        position.setSpeed(Double.valueOf(parser.group(index++)) * 0.539957);

        // Course
        position.setCourse(Double.valueOf(parser.group(index++)));

        // Altitude
        position.setAltitude(0.0);

        // Extended info
        position.setExtendedInfo(extendedInfo.toString());

        return position;
    }

}