/*
 * Copyright 2013 - 2015 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.DateBuilder;
import org.traccar.helper.DateUtil;
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 TaipProtocolDecoder extends BaseProtocolDecoder {

    private final boolean sendResponse;

    public TaipProtocolDecoder(TaipProtocol protocol, boolean sendResponse) {
        super(protocol);
        this.sendResponse = sendResponse;
    }

    private static final Pattern PATTERN = new PatternBuilder()
            .groupBegin()
            .expression("R[EP]V")                // type
            .groupBegin()
            .number("dd")                        // event index
            .number("(dddd)")                    // week
            .number("(d)")                       // day
            .groupEnd("?")
            .number("(d{5})")                    // seconds
            .or()
            .text("RGP")                         // type
            .number("(dd)(dd)(dd)")              // date
            .number("(dd)(dd)(dd)")              // time
            .groupEnd()
            .number("([-+]dd)(d{5})")            // latitude
            .number("([-+]ddd)(d{5})")           // longitude
            .number("(ddd)")                     // speed
            .number("(ddd)")                     // course
            .number("(d)")                       // fix mode
            .any()
            .compile();

    private Date getTime(long week, long day, long seconds) {
        DateBuilder dateBuilder = new DateBuilder()
                .setDate(1980, 1, 6)
                .addMillis(((week * 7 + day) * 24 * 60 * 60 + seconds) * 1000);
        return dateBuilder.getDate();
    }

    private Date getTime(long seconds) {
        DateBuilder dateBuilder = new DateBuilder(new Date())
                .setTime(0, 0, 0, 0)
                .addMillis(seconds * 1000);
        return DateUtil.correctDay(dateBuilder.getDate());
    }

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

        String sentence = (String) msg;

        int beginIndex = sentence.indexOf('>');
        if (beginIndex != -1) {
            sentence = sentence.substring(beginIndex + 1);
        }

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

        Position position = new Position();
        position.setProtocol(getProtocolName());

        String week = parser.next();
        String day = parser.next();
        String seconds = parser.next();
        if (seconds != null) {
            if (week != null && day != null) {
                position.setTime(getTime(Integer.parseInt(week), Integer.parseInt(day), Integer.parseInt(seconds)));
            } else {
                position.setTime(getTime(Integer.parseInt(seconds)));
            }
        }

        if (parser.hasNext(6)) {
            DateBuilder dateBuilder = new DateBuilder()
                    .setDateReverse(parser.nextInt(), parser.nextInt(), parser.nextInt())
                    .setTime(parser.nextInt(), parser.nextInt(), parser.nextInt());
            position.setTime(dateBuilder.getDate());
        }

        position.setLatitude(parser.nextCoordinate(Parser.CoordinateFormat.DEG_DEG));
        position.setLongitude(parser.nextCoordinate(Parser.CoordinateFormat.DEG_DEG));
        position.setSpeed(UnitsConverter.knotsFromMph(parser.nextDouble()));
        position.setCourse(parser.nextDouble());
        position.setValid(parser.nextInt() != 0);

        String[] attributes = null;
        beginIndex = sentence.indexOf(';');
        if (beginIndex != -1) {
            int endIndex = sentence.indexOf('<', beginIndex);
            if (endIndex == -1) {
                endIndex = sentence.length();
            }
            attributes = sentence.substring(beginIndex, endIndex).split(";");
        }

        if (attributes != null) {
            for (String attribute : attributes) {
                int index = attribute.indexOf('=');
                if (index != -1) {
                    String key = attribute.substring(0, index).toLowerCase();
                    String value = attribute.substring(index + 1);
                    switch (key) {

                        case "id":
                            DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, value);
                            if (deviceSession != null) {
                                position.setDeviceId(deviceSession.getDeviceId());
                            }
                            if (sendResponse && channel != null) {
                                channel.write(value);
                            }
                            break;

                        case "sv":
                            position.set(Position.KEY_SATELLITES, value);
                            break;

                        case "bl":
                            position.set(Position.KEY_BATTERY, value);
                            break;

                        case "vo":
                            position.set(Position.KEY_ODOMETER, Long.parseLong(value));
                            break;

                        default:
                            position.set(key, value);
                            break;

                    }
                }
            }
        }

        if (position.getDeviceId() != 0) {
            return position;
        }
        return null;
    }

}