using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Data;
using System.Drawing;
using System.IO.Ports;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Client
{


    public partial class client : Form
    {

        MAVLink.MavlinkParse mavlink = new MAVLink.MavlinkParse();
        // locking to prevent multiple reads on serial port
        object readlock = new object();
        // our target sysid
        byte sysid;
        // our target compid
        byte compid;

        public client()
        {
            InitializeComponent();
        }

        private void but_connect_Click(object sender, EventArgs e)
        {
            // if the port is open close it
            if (serialPort1.IsOpen)
            {
                serialPort1.Close();
                return;
            }

            // set the comport options
            serialPort1.PortName = CMB_comport.Text;
            serialPort1.BaudRate = 115200;

            // open the comport
            serialPort1.Open();

            // set timeout to 2 seconds
            serialPort1.ReadTimeout = 2000;

            BackgroundWorker bgw = new BackgroundWorker();

            bgw.DoWork += bgw_DoWork;

            bgw.RunWorkerAsync();
        }

        public static DisplayAttribute GetDisplayAttributesFrom(Enum enumValue, Type enumType)
        {
            return enumType.GetMember(enumValue.ToString())
                           .First()
                           .GetCustomAttribute<DisplayAttribute>();
        }

        int mav_messages_counter = 0;
        void bgw_DoWork(object sender, DoWorkEventArgs e)
        {
            while (serialPort1.IsOpen)
            {
                try
                {
                    MAVLink.MAVLinkMessage packet;
                    lock (readlock)
                    {
                        // read any valid packet from the port
                        packet = mavlink.ReadPacket(serialPort1.BaseStream);

                        // check its valid
                        if (packet == null || packet.data == null)
                            continue;
                    }

                    // check to see if its a hb packet from the comport
                    if (packet.data.GetType() == typeof(MAVLink.mavlink_heartbeat_t))
                    {

                        var hb = (MAVLink.mavlink_heartbeat_t)packet.data;

                        // save the sysid and compid of the seen MAV
                        sysid = packet.sysid;
                        compid = packet.compid;

                        // request streams at 2 hz
                        var buffer = mavlink.GenerateMAVLinkPacket10(MAVLink.MAVLINK_MSG_ID.REQUEST_DATA_STREAM,
                            new MAVLink.mavlink_request_data_stream_t()
                            {
                                req_message_rate = 2,
                                req_stream_id = (byte)MAVLink.MAV_DATA_STREAM.ALL,
                                start_stop = 1,
                                target_component = compid,
                                target_system = sysid
                            });

                        serialPort1.Write(buffer, 0, buffer.Length);

                        buffer = mavlink.GenerateMAVLinkPacket10(MAVLink.MAVLINK_MSG_ID.HEARTBEAT, hb);

                        serialPort1.Write(buffer, 0, buffer.Length);
                    }

                    // from here we should check the the message is addressed to us
                    if (sysid != packet.sysid || compid != packet.compid)
                        continue;

                    //Console.WriteLine(packet.msgtypename);

                    listBox1.Invoke(new Action(() =>
                    {

                        if (!listBox1.Items.Contains(packet.msgtypename))
                        {
                            mav_messages_counter++;
                            if (mav_messages_counter > 0) mav_messages_Label.ForeColor = Color.Green;
                            listBox1.Items.Add(packet.msgtypename);
                            mav_messages_Label.Text = "Found " + mav_messages_counter + " messages.";
                        }

                    }));

                    

                    if (packet.msgid == (byte)MAVLink.MAVLINK_MSG_ID.HEARTBEAT){
                        var heartbeat = (MAVLink.mavlink_heartbeat_t)packet.data;
                        richTextBox1.Invoke(new Action(() =>
                        {
                            txt_vehicleType.Text = ((MAVLink.MAV_TYPE)heartbeat.autopilot).ToString();
                            txt_autopilot.Text = ((MAVLink.MAV_AUTOPILOT)heartbeat.autopilot).ToString();
                            txt_baseMode.Text = ((MAVLink.MAV_MODE_FLAG)heartbeat.base_mode).ToString();
                            txt_system.Text = ((MAVLink.MAV_STATE)heartbeat.system_status).ToString();
                        }));
                    }

                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.ToString());
                }

                System.Threading.Thread.Sleep(1);
            }
        }

        T readsomedata<T>(byte sysid, byte compid, int timeout = 2000)
        {
            DateTime deadline = DateTime.Now.AddMilliseconds(timeout);

            lock (readlock)
            {
                // read the current buffered bytes
                while (DateTime.Now < deadline)
                {
                    var packet = mavlink.ReadPacket(serialPort1.BaseStream);

                    // check its not null, and its addressed to us
                    if (packet == null || sysid != packet.sysid || compid != packet.compid)
                        continue;

                    //Console.WriteLine(packet);

                    if (packet.data.GetType() == typeof(T))
                    {
                        return (T)packet.data;
                    }
                }
            }

            throw new Exception("No packet match found");
        }


        private void CMB_comport_Click(object sender, EventArgs e)
        {
            CMB_comport.DataSource = SerialPort.GetPortNames();
        }


        private void simpleexample_Load(object sender, EventArgs e)
        {

        }

        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {

        }

        private void listBox1_DoubleClick(object sender, EventArgs e)
        {

        }
    }
}