using System;

using System.Windows.Forms;

using System.Runtime.InteropServices;

using System.Diagnostics;

using Hid.UsageTables;

using Win32;

namespace Devices.RemoteControl

{

	public enum InputDevice

	{

		Key,

		Mouse,

		OEM

	}

	public enum RemoteControlButton

	{

		Clear,

		Down,

		Left,

		Digit0,

		Digit1,

		Digit2,

		Digit3,

		Digit4,

		Digit5,

		Digit6,

		Digit7,

		Digit8,

		Digit9,

		Enter,

		Right,

		Up,

		Back,

		ChannelDown,

		ChannelUp,

		FastForward,

		VolumeMute,

		Pause,

		Play,

        PlayPause,

		Record,

		PreviousTrack,

		Rewind,

		NextTrack,

		Stop,

		VolumeDown,

		VolumeUp,

		RecordedTV,

		Guide,

		LiveTV,

		MoreInfo,

        Print,

		DVDMenu,

		DVDAngle,

		DVDAudio,

		DVDSubtitle,

		MyMusic,

		MyPictures,

		MyVideos,

		MyTV,

		OEM1,

		OEM2,

		StandBy,

		TVJump,

		Unknown

	}

	#region RemoteControlEventArgs

	public class RemoteControlEventArgs : EventArgs

	{

        RemoteControlButton _rcb;

		InputDevice _device;

        MceButton iMceButton;

        ConsumerControl iConsumerControl;

        public RemoteControlEventArgs(RemoteControlButton rcb, InputDevice device)

		{

            SetNullButtons();

            //

			_rcb = rcb;

			_device = device;            

		}

        public RemoteControlEventArgs(ConsumerControl aConsumerControl, InputDevice device)

        {

            SetNullButtons();

            //

            iConsumerControl = aConsumerControl;            

            _device = device;

        }

        public RemoteControlEventArgs(MceButton mce, InputDevice device)

        {

            SetNullButtons();

            //

            iMceButton = mce;            

            _device = device;

        }

        private void SetNullButtons()

        {

            iConsumerControl = ConsumerControl.Null;

            iMceButton = MceButton.Null;

            _rcb = RemoteControlButton.Unknown;

        }

		public RemoteControlEventArgs()

		{

            iMceButton = MceButton.Null;

			_rcb = RemoteControlButton.Unknown;

			_device = InputDevice.Key;

		}

		public RemoteControlButton Button

		{

			get { return _rcb;  }

			set { _rcb = value; }

		}

        public MceButton MceButton

        {

            get { return iMceButton; }

            set { iMceButton = value; }

        }

        public ConsumerControl ConsumerControl

        {

            get { return iConsumerControl; }

            set { iConsumerControl = value; }

        }

		public InputDevice Device

		{

			get { return _device;  }

			set { _device = value; }

		}

	}

	#endregion RemoteControlEventArgs

	public sealed class RemoteControlDevice

	{

		public delegate bool RemoteControlDeviceEventHandler(object sender, RemoteControlEventArgs e);

		public event RemoteControlDeviceEventHandler ButtonPressed;

        /// <summary>

        /// Return true if the usage was processed.

        /// </summary>

        /// <param name="aUsage"></param>

        /// <returns></returns>

        public delegate bool HidUsageHandler(ushort aUsage);

		//-------------------------------------------------------------

		// constructors

		//-------------------------------------------------------------

		public RemoteControlDevice(IntPtr aHWND)

		{

			// Register the input device to receive the commands from the

			// remote device. See http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnwmt/html/remote_control.asp

			// for the vendor defined usage page.

			RAWINPUTDEVICE[] rid = new RAWINPUTDEVICE[5];

            int i = 0;

			rid[i].usUsagePage = (ushort)Hid.UsagePage.MceRemote;

            rid[i].usUsage = (ushort)Hid.UsageIdMce.MceRemote;

            rid[i].dwFlags = Const.RIDEV_EXINPUTSINK;

            rid[i].hwndTarget = aHWND;

            i++;

            rid[i].usUsagePage = (ushort)Hid.UsagePage.Consumer;

            rid[i].usUsage = (ushort)Hid.UsageIdConsumer.ConsumerControl;

            rid[i].dwFlags = Const.RIDEV_EXINPUTSINK;

            rid[i].hwndTarget = aHWND;

            i++;

            rid[i].usUsagePage = (ushort)Hid.UsagePage.Consumer;

            rid[i].usUsage = (ushort)Hid.UsageIdConsumer.Selection;

            rid[i].dwFlags = Const.RIDEV_EXINPUTSINK;

            rid[i].hwndTarget = aHWND;

            i++;

            rid[i].usUsagePage = (ushort)Hid.UsagePage.GenericDesktopControl;

            rid[i].usUsage = (ushort)Hid.UsageIdGenericDesktop.SystemControl;

            rid[i].dwFlags = Const.RIDEV_EXINPUTSINK;

            rid[i].hwndTarget = aHWND;

            i++;

            rid[i].usUsagePage = (ushort)Hid.UsagePage.GenericDesktopControl;

            rid[i].usUsage = (ushort)Hid.UsageIdGenericDesktop.Keyboard;

            rid[i].dwFlags = Const.RIDEV_EXINPUTSINK;

            rid[i].hwndTarget = aHWND;

            //i++;

            //rid[i].usUsagePage = (ushort)Hid.UsagePage.GenericDesktopControl;

            //rid[i].usUsage = (ushort)Hid.UsageIdGenericDesktop.Mouse;

            //rid[i].dwFlags = Const.RIDEV_EXINPUTSINK;

            //rid[i].hwndTarget = aHWND;

			if (!Function.RegisterRawInputDevices(rid,(uint) rid.Length,(uint) Marshal.SizeOf(rid[0])))

			{

                throw new ApplicationException("Failed to register raw input devices: " + Marshal.GetLastWin32Error().ToString());

			}

		}

		//-------------------------------------------------------------

		// methods

		//-------------------------------------------------------------

		public void ProcessMessage(Message message)

		{

			switch (message.Msg)

			{

				case Const.WM_KEYDOWN:

                    ProcessKeyDown(message.WParam);

					break;

                case Const.WM_INPUT:

                    //Returning zero means we processed that message.

                    message.Result = new IntPtr(0);

					ProcessInputCommand(ref message);

					break;

			}

		}

		//-------------------------------------------------------------

		// methods (helpers)

		//-------------------------------------------------------------

		private void ProcessKeyDown(IntPtr wParam)

		{

			RemoteControlButton rcb = RemoteControlButton.Unknown;

            switch (wParam.ToInt32())

			{

				case (int) Keys.Escape:

					rcb = RemoteControlButton.Clear;

                    break;

                case (int)Keys.Up:

                    rcb = RemoteControlButton.Up;

                    break;

				case (int) Keys.Down:

					rcb = RemoteControlButton.Down;

					break;

				case (int) Keys.Left:

					rcb = RemoteControlButton.Left;

                    break;

                case (int)Keys.Right:

                    rcb = RemoteControlButton.Right;

                    break;

                case (int)Keys.Enter:

                    rcb = RemoteControlButton.Enter;

                    break;

				case (int) Keys.D0:

					rcb = RemoteControlButton.Digit0;

					break;

				case (int) Keys.D1:

					rcb = RemoteControlButton.Digit1;

					break;

				case (int) Keys.D2:

					rcb = RemoteControlButton.Digit2;

					break;

				case (int) Keys.D3:

					rcb = RemoteControlButton.Digit3;

					break;

				case (int) Keys.D4:

					rcb = RemoteControlButton.Digit4;

					break;

				case (int) Keys.D5:

					rcb = RemoteControlButton.Digit5;

					break;

				case (int) Keys.D6:

					rcb = RemoteControlButton.Digit6;

					break;

				case (int) Keys.D7:

					rcb = RemoteControlButton.Digit7;

					break;

				case (int) Keys.D8:

					rcb = RemoteControlButton.Digit8;

					break;

				case (int) Keys.D9:

					rcb = RemoteControlButton.Digit9;

                    break;

			}

            if (this.ButtonPressed != null && rcb != RemoteControlButton.Unknown)

            {

                Debug.WriteLine("KeyDown: " + rcb.ToString());

                this.ButtonPressed(this, new RemoteControlEventArgs(rcb, InputDevice.Key));

            }

		}

        /// <summary>

        /// 

        /// </summary>

        /// <param name="aUsage"></param>

        private bool HidConsumerDeviceHandler(ushort aUsage)

        {

            if (aUsage == 0)

            {

                //Just skip those

                return false;

            }

            if (Enum.IsDefined(typeof(ConsumerControl), aUsage) && aUsage != 0) //Our button is a known consumer control

            {

                if (this.ButtonPressed != null)

                {

                    return this.ButtonPressed(this, new RemoteControlEventArgs((ConsumerControl)aUsage, InputDevice.OEM));

                }

                return false;

            }

            else

            {

                Debug.WriteLine("Unknown Consumer Control!");

                return false;

            }

        }

        /// <summary>

        /// 

        /// </summary>

        /// <param name="aUsage"></param>

        private bool HidMceRemoteHandler(ushort aUsage)

        {

            if (aUsage == 0)

            {

                //Just skip those

                return false;

            }

            if (Enum.IsDefined(typeof(MceButton), aUsage) && aUsage != 0) //Our button is a known MCE button

            {

                if (this.ButtonPressed != null)

                {

                    return this.ButtonPressed(this, new RemoteControlEventArgs((MceButton)aUsage, InputDevice.OEM));                    

                }

                return false;

            }

            else

            {

                Debug.WriteLine("Unknown MCE button!");

                return false;

            }

        }

		private void ProcessInputCommand(ref Message message)

		{

            //We received a WM_INPUT message

            Debug.WriteLine("================WM_INPUT================");

            //Check if we received this message while in background or foreground

            if (Macro.GET_RAWINPUT_CODE_WPARAM(message.WParam) == Const.RIM_INPUT)

            {

                Debug.WriteLine("================FOREGROUND");

            }

            else if (Macro.GET_RAWINPUT_CODE_WPARAM(message.WParam) == Const.RIM_INPUTSINK)

            {

                Debug.WriteLine("================BACKGROUND");

            }

            //Declare some pointers

            IntPtr rawInputBuffer = IntPtr.Zero;

            //My understanding is that this is basically our HID descriptor

            IntPtr preParsedData = IntPtr.Zero;

            try

            {

                //Fetch raw input

                RAWINPUT rawInput = new RAWINPUT();

                if (!RawInput.GetRawInputData(message.LParam, ref rawInput, ref rawInputBuffer))

                {

                    return;

                }

                //Fetch device info

                RID_DEVICE_INFO deviceInfo = new RID_DEVICE_INFO();

                if (!RawInput.GetDeviceInfo(rawInput.header.hDevice, ref deviceInfo))

                {

                    return;

                }

                //

                Debug.WriteLine(RawInput.GetDeviceName(rawInput.header.hDevice));

                if (rawInput.header.dwType == Const.RIM_TYPEHID)  //Check that our raw input is HID                        

                {

                    Debug.WriteLine("WM_INPUT source device is HID.");

                    //Get Usage Page and Usage

                    Debug.WriteLine("Usage Page: 0x" + deviceInfo.hid.usUsagePage.ToString("X4") + " Usage ID: 0x" + deviceInfo.hid.usUsage.ToString("X4"));

                    preParsedData = RawInput.GetPreParsedData(rawInput.header.hDevice);

                    //

                    HidUsageHandler usagePageHandler=null;

                    //Check if this an MCE remote HID message

                    if (deviceInfo.hid.usUsagePage == (ushort)Hid.UsagePage.MceRemote && deviceInfo.hid.usUsage == (ushort)Hid.UsageIdMce.MceRemote)

                    {                        

                        usagePageHandler = HidMceRemoteHandler;

                    }

                    //Check if this is a consumer control HID message

                    else if (deviceInfo.hid.usUsagePage == (ushort)Hid.UsagePage.Consumer && deviceInfo.hid.usUsage == (ushort)Hid.UsageIdConsumer.ConsumerControl)

                    {

                        usagePageHandler = HidConsumerDeviceHandler;

                    }

                    //Unknown HID message

                    else

                    {

                        Debug.WriteLine("Unknown HID message.");

                        return;

                    }

                    if (!(rawInput.hid.dwSizeHid > 1     //Make sure our HID msg size more than 1. In fact the first ushort is irrelevant to us for now

                        && rawInput.hid.dwCount > 0))    //Check that we have at least one HID msg

                    {

                        return;

                    }

                    //Allocate a buffer for one HID input

                    byte[] hidInputReport = new byte[rawInput.hid.dwSizeHid];

                    Debug.WriteLine("Raw input contains " + rawInput.hid.dwCount + " HID input report(s)");

                    //For each HID input report in our raw input

                    for (int i = 0; i < rawInput.hid.dwCount; i++)

                    {

                        //Compute the address from which to copy our HID input

                        int hidInputOffset = 0;

                        unsafe

                        {

                            byte* source = (byte*)rawInputBuffer;

                            source += sizeof(RAWINPUTHEADER) + sizeof(RAWHID) + (rawInput.hid.dwSizeHid * i);

                            hidInputOffset = (int)source;

                        }

                        //Copy HID input into our buffer

                        Marshal.Copy(new IntPtr(hidInputOffset), hidInputReport, 0, (int)rawInput.hid.dwSizeHid);

                        //Print HID input report in our debug output

                        string hidDump = "HID input report: ";

                        foreach (byte b in hidInputReport)

                        {

                            hidDump += b.ToString("X2");

                        }

                        Debug.WriteLine(hidDump);

                        //Proper parsing now

                        uint usageCount = 1; //Assuming a single usage per input report. Is that correct?

                        Win32.USAGE_AND_PAGE[] usages = new Win32.USAGE_AND_PAGE[usageCount];

                        Win32.HidStatus status = Win32.Function.HidP_GetUsagesEx(Win32.HIDP_REPORT_TYPE.HidP_Input, 0, usages, ref usageCount, preParsedData, hidInputReport, (uint)hidInputReport.Length);

                        if (status != Win32.HidStatus.HIDP_STATUS_SUCCESS)

                        {

                            Debug.WriteLine("Could not parse HID data!");

                        }

                        else

                        {

                            Debug.WriteLine("UsagePage: 0x" + usages[0].UsagePage.ToString("X4"));

                            Debug.WriteLine("Usage: 0x" + usages[0].Usage.ToString("X4"));

                            //Call on our Usage Page handler

                            usagePageHandler(usages[0].Usage);

                        }

                    }

                }

                else if (rawInput.header.dwType == Const.RIM_TYPEMOUSE)

                {

                    Debug.WriteLine("WM_INPUT source device is Mouse.");

                    // do mouse handling...

                }

                else if (rawInput.header.dwType == Const.RIM_TYPEKEYBOARD)

                {

                    Debug.WriteLine("WM_INPUT source device is Keyboard.");

                    // do keyboard handling...

                    Debug.WriteLine("Type: " + deviceInfo.keyboard.dwType.ToString());

                    Debug.WriteLine("SubType: " + deviceInfo.keyboard.dwSubType.ToString());

                    Debug.WriteLine("Mode: " + deviceInfo.keyboard.dwKeyboardMode.ToString());

                    Debug.WriteLine("Number of function keys: " + deviceInfo.keyboard.dwNumberOfFunctionKeys.ToString());

                    Debug.WriteLine("Number of indicators: " + deviceInfo.keyboard.dwNumberOfIndicators.ToString());

                    Debug.WriteLine("Number of keys total: " + deviceInfo.keyboard.dwNumberOfKeysTotal.ToString());                   

                }

            }

            finally

            {

                //Always executed when leaving our try block

                Marshal.FreeHGlobal(rawInputBuffer);

                Marshal.FreeHGlobal(preParsedData);

            }

		}

	}

}