package org.traccar.protocol;

import org.jboss.netty.bootstrap.ServerBootstrap;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.ChannelPipeline;
import org.traccar.BaseProtocol;
import org.traccar.TrackerServer;
import org.traccar.database.ActiveDevice;
import org.traccar.helper.Crc;
import org.traccar.http.commands.CommandType;
import org.traccar.http.commands.NoParameterCommand;
import org.traccar.protocol.commands.CommandTemplate;

import java.util.List;
import java.util.Map;

public class Gt06Protocol extends BaseProtocol {

    public Gt06Protocol() {
        super("gt06");
    }

    @Override
    protected void loadCommandsTemplates(Map<CommandType, CommandTemplate> templates) {
        templates.put(CommandType.STOP_ENGINE, new Gt06CommandTemplate("DYD#"));
        templates.put(CommandType.RESUME_ENGINE, new Gt06CommandTemplate("HFYD#"));
    }

    @Override
    public void addTrackerServersTo(List<TrackerServer> serverList) {
        serverList.add(new TrackerServer(new ServerBootstrap(), this.getName()) {
            @Override
            protected void addSpecificHandlers(ChannelPipeline pipeline) {
                pipeline.addLast("frameDecoder", new Gt06FrameDecoder());
                pipeline.addLast("objectDecoder", new Gt06ProtocolDecoder(Gt06Protocol.this));
            }
        });
    }

    class Gt06CommandTemplate implements CommandTemplate<NoParameterCommand> {

        private String commandContent;

        public Gt06CommandTemplate(String commandContent) {
            this.commandContent = commandContent;
        }

        @Override
        public Object applyTo(ActiveDevice activeDevice, NoParameterCommand command) {
            int serverFlagBit = 0x0;
            int commandLength = serverFlagBit + commandContent.length();
            int packetLength =  0x80 /*Protocol Number */ + commandContent.length() /* Information Content */ + 2 /*Information Serial Number */+  2 /*Error Check */;

            int informationSerialNumber = 1;


            ChannelBuffer response = ChannelBuffers.directBuffer(10);
            response.writeBytes(new byte[]{0x78, 0x78}); // Start Bit
            response.writeByte(packetLength); // Packet Length
            response.writeByte(0x80); // Protocol Number

            // Information Content
            response.writeByte(commandLength); // Length of command
            response.writeByte(serverFlagBit); // Server Flag Bit
            response.writeBytes(commandContent.getBytes()); // Command Content
            response.writeBytes(new byte[]{0x00, 0x02}); // Language

            response.writeShort(informationSerialNumber); // Information Serial Number

            int crc = Crc.crc16Ccitt(response.toByteBuffer(2, response.writerIndex()));
            response.writeShort(crc); // Error Check

            response.writeBytes(new byte[] {0x0D, 0x0A}); // Stop Bit

            return response;
        }
    }
}