using Windows.Devices.Enumeration;
using Windows.Devices.HumanInterfaceDevice;
using Windows.Storage;
using Windows.Storage.Streams;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Text;


namespace HIDdeviceTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            EnumerateHidDevices();

        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }


        // Find HID devices.
        private async void EnumerateHidDevices()
        {
            // Microsoft Input Configuration Device.
            ushort vendorId = 0x046D;
            ushort productId = 0xC24A;
            ushort usagePage = 0xFF80;
            ushort usageId = 0x0080;

            // Create the selector.
            string selector =
                HidDevice.GetDeviceSelector(usagePage, usageId, vendorId, productId);

            // Enumerate devices using the selector.
            var devices = await DeviceInformation.FindAllAsync(selector);

            if (devices.Any())
            {
                // At this point the device is available to communicate with
                // So we can send/receive HID reports from it or 
                // query it for control descriptions.
                System.Diagnostics.Debug.WriteLine("HID devices found: " + devices.Count);

                // Open the target HID device.
                HidDevice device =
                    await HidDevice.FromIdAsync(devices.ElementAt(0).Id,
                    FileAccessMode.Read);

                if (device != null)
                {
                    System.Diagnostics.Debug.WriteLine("Device not null, adding async calls");

                    // Input reports contain data from the device.
                    device.InputReportReceived += async (sender, args) =>
                    {
                        HidInputReport inputReport = args.Report;
                        IBuffer buffer = inputReport.Data;

                        // Create a DispatchedHandler as we are interracting with the UI directly and the
                        // thread that this function is running on might not be the UI thread; 
                        // if a non-UI thread modifies the UI, an exception is thrown.


                        StringBuilder data = new StringBuilder();
                        foreach (var d in buffer.ToArray())
                        {
                            data.Append(d.ToString());
                        }

                        System.Diagnostics.Debug.WriteLine("HID Input Report: " + inputReport.ToString() +
                        "\nTotal number of bytes received: " + buffer.Length.ToString() + 
                        "\n Data: 0x" + data.ToString());
                    };
                    System.Diagnostics.Debug.WriteLine("Added input report received");
                } else
                {
                    System.Diagnostics.Debug.WriteLine("NO DEVICES TO LOOK AT");
                }

            }
            else
            {
                // There were no HID devices that met the selector criteria.
                Console.Error.WriteLine("HID device not found");
            }
        }

    }
}