/*
 * Copyright 2018 Anton Tananaev (anton@traccar.org)
 *
 * 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 org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.helper.Parser;
import org.traccar.helper.PatternBuilder;
import org.traccar.model.Position;

import java.net.SocketAddress;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.regex.Pattern;

public class Pt60ProtocolDecoder extends BaseProtocolDecoder {

    public Pt60ProtocolDecoder(Pt60Protocol protocol) {
        super(protocol);
    }

    private static final Pattern PATTERN = new PatternBuilder()
            .text("@G#@,")                       // header
            .number("Vdd,")                      // protocol version
            .number("d,")                        // type
            .number("(d+),")                     // imei
            .number("(d+),")                     // imsi
            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
            .number("(dd)(dd)(dd),")             // time (hhmmss)
            .number("(-?d+.d+);")                // latitude
            .number("(-?d+.d+),")                // longitude
            .compile();

    private void sendResponse(Channel channel) {
        if (channel != null) {
            DateFormat dateFormat = new SimpleDateFormat("yyyyMMddHHmmss");
            channel.write("@G#@,V01,38," + dateFormat.format(new Date()) + ",@R#@");
        }
    }

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

        sendResponse(channel);

        Parser parser = new Parser(PATTERN, (String) msg);
        if (!parser.matches()) {
            return null;
        }

        Position position = new Position(getProtocolName());

        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, parser.next(), parser.next());
        if (deviceSession == null) {
            return null;
        }
        position.setDeviceId(deviceSession.getDeviceId());

        position.setValid(true);
        position.setTime(parser.nextDateTime());
        position.setLatitude(parser.nextDouble());
        position.setLongitude(parser.nextDouble());

        return position;
    }

}