/*
 * Copyright 2021 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 io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufUtil;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;

import java.net.SocketAddress;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;

public class Dsf22ProtocolDecoder extends BaseProtocolDecoder {

    public Dsf22ProtocolDecoder(Protocol protocol) {
        super(protocol);
    }

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

        ByteBuf buf = (ByteBuf) msg;

        buf.skipBytes(2); // header

        String id = ByteBufUtil.hexDump(buf.readSlice(2));
        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, id);
        if (deviceSession == null) {
            return null;
        }

        List<Position> positions = new LinkedList<>();
        int count = buf.readUnsignedByte();

        for (int i = 0; i < count; i++) {

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

            position.setValid(true);
            position.setLatitude(buf.readInt());
            position.setLongitude(buf.readInt());
            position.setTime(new Date(946684800000L + buf.readUnsignedInt()));
            position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));

            position.set(Position.KEY_FUEL_LEVEL, buf.readUnsignedShort() * 0.001);

            int status = buf.readUnsignedByte();
            position.set(Position.KEY_IGNITION, BitUtil.check(status, 0));
            position.set(Position.PREFIX_IN + 1, BitUtil.check(status, 1));
            position.set(Position.PREFIX_OUT + 1, BitUtil.check(status, 4));
            position.set(Position.KEY_ALARM, BitUtil.check(status, 6) ? Position.ALARM_JAMMING : null);
            position.set(Position.KEY_STATUS, status);

            positions.add(position);

        }

        if (channel != null) {
            byte[] response = {0x01};
            channel.writeAndFlush(new NetworkMessage(Unpooled.wrappedBuffer(response), remoteAddress));
        }

        return positions;
    }

}