/*
 * Copyright 2015 - 2016 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 org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.Parser;
import org.traccar.helper.PatternBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;

import java.net.SocketAddress;
import java.util.Date;
import java.util.regex.Pattern;

public class WatchProtocolDecoder extends BaseProtocolDecoder {

    public WatchProtocolDecoder(WatchProtocol protocol) {
        super(protocol);
    }

    private static final Pattern PATTERN = new PatternBuilder()
            .text("[")
            .expression("(..)").text("*")        // manufacturer
            .number("(d+)").text("*")            // equipment id
            .number("xxxx").text("*")            // length
            .expression("([^,]+)")               // type
            .expression("(.*)")                  // content
            .compile();

    private static final Pattern PATTERN_POSITION = new PatternBuilder()
            .text(",")
            .number("(dd)(dd)(dd),")             // date (ddmmyy)
            .number("(dd)(dd)(dd),")             // time
            .expression("([AV]),")               // validity
            .number(" *(-?d+.d+),")              // latitude
            .expression("([NS]),")
            .number(" *(-?d+.d+),")              // longitude
            .expression("([EW])?,")
            .number("(d+.d+),")                  // speed
            .number("(d+.?d*),")                 // course
            .number("(d+.?d*),")                 // altitude
            .number("(d+),")                     // satellites
            .number("(d+),")                     // gsm
            .number("(d+),")                     // battery
            .number("(d+),")                     // steps
            .number("d+,")                       // tumbles
            .any()
            .compile();

    private void sendResponse(Channel channel, String manufacturer, String id, String content) {
        if (channel != null) {
            channel.write(String.format(
                    "[%s*%s*%04x*%s]", manufacturer, id, content.length(), content));
        }
    }

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

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

        String manufacturer = parser.next();
        String id = parser.next();
        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, id);
        if (deviceSession == null) {
            return null;
        }

        String type = parser.next();
        String content = parser.next();

        if (type.equals("LK")) {

            sendResponse(channel, manufacturer, id, "LK");

            if (!content.isEmpty()) {
                String[] values = content.split(",");
                if (values.length >= 4) {
                    Position position = new Position();
                    position.setProtocol(getProtocolName());
                    position.setDeviceId(deviceSession.getDeviceId());

                    getLastLocation(position, null);

                    position.set(Position.KEY_BATTERY, values[3]);

                    return position;
                }
            }

        } else if (type.equals("UD") || type.equals("UD2") || type.equals("AL")) {

            if (type.equals("AL")) {
                sendResponse(channel, manufacturer, id, "AL");
            }

            parser = new Parser(PATTERN_POSITION, content);
            if (!parser.matches()) {
                return null;
            }

            Position position = new Position();
            position.setProtocol(getProtocolName());
            position.setDeviceId(deviceSession.getDeviceId());

            DateBuilder dateBuilder = new DateBuilder()
                    .setDateReverse(parser.nextInt(), parser.nextInt(), parser.nextInt())
                    .setTime(parser.nextInt(), parser.nextInt(), parser.nextInt());
            position.setTime(dateBuilder.getDate());

            position.setValid(parser.next().equals("A"));
            position.setLatitude(parser.nextCoordinate(Parser.CoordinateFormat.DEG_HEM));
            position.setLongitude(parser.nextCoordinate(Parser.CoordinateFormat.DEG_HEM));
            position.setSpeed(UnitsConverter.knotsFromKph(parser.nextDouble()));
            position.setCourse(parser.nextDouble());
            position.setAltitude(parser.nextDouble());

            position.set(Position.KEY_SATELLITES, parser.nextInt());
            position.set(Position.KEY_GSM, parser.nextInt());
            position.set(Position.KEY_BATTERY, parser.nextInt());

            position.set("steps", parser.nextInt());

            return position;

        } else if (type.equals("TKQ")) {

            sendResponse(channel, manufacturer, id, "TKQ");

        } else if (type.equals("PULSE")) {

            Position position = new Position();
            position.setProtocol(getProtocolName());
            position.setDeviceId(deviceSession.getDeviceId());
            getLastLocation(position, new Date());
            position.setValid(false);
            position.set("pulse", content.split(",")[1]);
            return position;

        }

        return null;
    }

}