/*
 * 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 TotemProtocolDecoder extends BaseProtocolDecoder {

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

    static private Pattern patternFirst = Pattern.compile(
            "\\$\\$" +                          // Header
            "\\p{XDigit}{2}" +                  // Length
            "(\\d+)\\|" +                       // IMEI
            ".." +                              // Alarm Type
            "\\$GPRMC," +
            "(\\d{2})(\\d{2})(\\d{2})\\.\\d+," + // Time (HHMMSS.SS)
            "([AV])," +                         // Validity
            "(\\d+)(\\d{2}\\.\\d+)," +          // Latitude (DDMM.MMMM)
            "([NS])," +
            "(\\d+)(\\d{2}\\.\\d+)," +          // Longitude (DDDMM.MMMM)
            "([EW])," +
            "(\\d+\\.?\\d*)?," +                // Speed
            "(\\d+\\.?\\d*)?," +                // Course
            "(\\d{2})(\\d{2})(\\d{2})" +        // Date (DDMMYY)
            "[^\\*]+\\*\\p{XDigit}{2}\\|" +     // Checksum
            "\\d+\\.\\d+\\|" +                  // PDOP
            "(\\d+\\.\\d+)\\|" +                // HDOP
            "\\d+\\.\\d+\\|" +                  // VDOP
            "(\\d+)\\|" +                       // IO Status
            "\\d+\\|" +                         // Time
            "\\d" +                             // Charged
            "(\\d{3})" +                        // Battery
            "(\\d{4})\\|" +                     // External Power
            "(\\d+)\\|" +                       // ADC
            "(\\p{XDigit}{8})\\|" +             // Location Code
            "(\\d+)\\|" +                       // Temperature
            "(\\d+.\\d+)\\|" +                  // Milage
            "\\d+\\|" +                         // Serial Number
            "\\p{XDigit}{4}");                  // Checksum
            
    static private Pattern patternSecond = Pattern.compile(
            "\\$\\$" +                          // Header
            "\\p{XDigit}{2}" +                  // Length
            "(\\d+)\\|" +                       // IMEI
            ".." +                              // Alarm Type
            "(\\d{2})(\\d{2})(\\d{2})" +        // Date (DDMMYY)
            "(\\d{2})(\\d{2})(\\d{2})\\|" +     // Time (HHMMSS)
            "([AV])\\|" +                       // Validity
            "(\\d+)(\\d{2}\\.\\d+)\\|" +        // Latitude (DDMM.MMMM)
            "([NS])\\|" +
            "(\\d+)(\\d{2}\\.\\d+)\\|" +        // Longitude (DDDMM.MMMM)
            "([EW])\\|" +
            "(\\d+\\.\\d+)?\\|" +               // Speed
            "(\\d+)?\\|" +                      // Course
            "(\\d+\\.\\d+)\\|" +                // HDOP
            "(\\d+)\\|" +                       // IO Status
            "\\d" +                             // Charged
            "(\\d{2})" +                        // Battery
            "(\\d{2})\\|" +                     // External Power
            "(\\d+)\\|" +                       // ADC
            "(\\p{XDigit}{8})\\|" +             // Location Code
            "(\\d+)\\|" +                       // Temperature
            "(\\d+.\\d+)\\|" +                  // Milage
            "\\d+\\|" +                         // Serial Number
            "\\p{XDigit}{4}");                  // Checksum

    @Override
    protected Object decode(
            ChannelHandlerContext ctx, Channel channel, Object msg)
            throws Exception {
        
        String sentence = (String) msg;
        
        boolean first = sentence.contains("$GPRMC");

        // Parse message
        Matcher parser = first ? patternFirst.matcher(sentence) : patternSecond.matcher(sentence);
        if (!parser.matches()) {
            return null;
        }

        // Create new position
        Position position = new Position();
        ExtendedInfoFormatter extendedInfo = new ExtendedInfoFormatter("totem");

        Integer index = 1;

        // Get device by IMEI
        String imei = parser.group(index++);
        try {
            position.setDeviceId(getDataManager().getDeviceByImei(imei).getId());
        } catch(Exception error) {
            Log.warning("Unknown device - " + imei);
            return null;
        }

        // Time
        Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
        time.clear();
        int year = 0;
        if (!first) {
            year = Integer.valueOf(parser.group(index++));
            time.set(Calendar.YEAR, 2000 + year);
            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, Integer.valueOf(parser.group(index++)));
        time.set(Calendar.MINUTE, Integer.valueOf(parser.group(index++)));
        time.set(Calendar.SECOND, Integer.valueOf(parser.group(index++)));

        // Validity
        position.setValid(parser.group(index++).compareTo("A") == 0 ? true : false);

        // Latitude
        Double latitude = Double.valueOf(parser.group(index++));
        latitude += Double.valueOf(parser.group(index++)) / 60;
        if (parser.group(index++).compareTo("S") == 0) latitude = -latitude;
        position.setLatitude(latitude);

        // Longitude
        Double longitude = Double.valueOf(parser.group(index++));
        longitude += Double.valueOf(parser.group(index++)) / 60;
        if (parser.group(index++).compareTo("W") == 0) longitude = -longitude;
        position.setLongitude(longitude);

        // Speed
        String speed = parser.group(index++);
        if (speed != null) {
            position.setSpeed(Double.valueOf(speed));
        } else {
            position.setSpeed(0.0);
        }

        // Course
        String course = parser.group(index++);
        if (course != null) {
            position.setCourse(Double.valueOf(course));
        } else {
            position.setCourse(0.0);
        }

        // Date
        if (first) {
            year = Integer.valueOf(parser.group(index++));
            time.set(Calendar.YEAR, 2000 + year);
            time.set(Calendar.MONTH, Integer.valueOf(parser.group(index++)) - 1);
            time.set(Calendar.DAY_OF_MONTH, Integer.valueOf(parser.group(index++)));
        }
        if (year == 0) {
            return null; // ignore invalid data
        }
        position.setTime(time.getTime());

        // Altitude
        position.setAltitude(0.0);

        // Accuracy
        extendedInfo.set("hdop", parser.group(index++));

        // IO Status
        extendedInfo.set("io", parser.group(index++));

        // Power
        extendedInfo.set("battery", parser.group(index++));
        position.setPower(Double.valueOf(parser.group(index++)));

        // ADC
        extendedInfo.set("adc", parser.group(index++));

        // Location Code
        extendedInfo.set("lac", parser.group(index++));

        // Temperature
        extendedInfo.set("temperature", parser.group(index++));

        // Milage
        extendedInfo.set("milage", parser.group(index++));

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

        return position;
    }

}