#region License
//
// The Open Toolkit Library License
//
// Copyright (c) 2006 - 2010 the Open Toolkit library.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights to 
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do
// so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
//
#endregion

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.InteropServices;
using OpenTK.Input;

namespace OpenTK.Platform.MacOS
{
    using Carbon;
    using CFAllocatorRef = System.IntPtr;
    using CFDictionaryRef = System.IntPtr;
    using CFIndex = System.IntPtr;
    using CFRunLoop = System.IntPtr;
    using CFString = System.IntPtr;
    using CFStringRef = System.IntPtr; // Here used interchangeably with the CFString
    using CFTypeRef = System.IntPtr;
    using IOHIDDeviceRef = System.IntPtr;
    using IOHIDElementRef = System.IntPtr;
    using IOHIDManagerRef = System.IntPtr;
    using IOHIDValueRef = System.IntPtr;
    using IOOptionBits = System.IntPtr;
    using IOReturn = System.IntPtr;

    // Requires Mac OS X 10.5 or higher.
    // Todo: create a driver for older installations. Maybe use CGGetLastMouseDelta for that?
    class HIDInput : IInputDriver2, IMouseDriver2, IKeyboardDriver2/*, IGamePadDriver*/
    {
        #region Fields

        readonly IOHIDManagerRef hidmanager;

        readonly Dictionary<IntPtr, MouseState> MouseDevices =
            new Dictionary<IntPtr, MouseState>(new IntPtrEqualityComparer());
        readonly Dictionary<int, IntPtr> MouseIndexToDevice =
            new Dictionary<int, IntPtr>();
        readonly Dictionary<IntPtr, KeyboardState> KeyboardDevices =
            new Dictionary<IntPtr, KeyboardState>(new IntPtrEqualityComparer());
        readonly Dictionary<int, IntPtr> KeyboardIndexToDevice =
            new Dictionary<int, IntPtr>();

        readonly CFRunLoop RunLoop = CF.CFRunLoopGetMain();
        readonly CFString InputLoopMode = CF.RunLoopModeDefault;
        readonly CFDictionary DeviceTypes = new CFDictionary();

        NativeMethods.IOHIDDeviceCallback HandleDeviceAdded;
        NativeMethods.IOHIDDeviceCallback HandleDeviceRemoved;
        NativeMethods.IOHIDValueCallback HandleDeviceValueReceived;

        bool disposed;

        #endregion

        #region Constructors

        public HIDInput()
        {
            Debug.Print("Using HIDInput.");

            HandleDeviceAdded = DeviceAdded;
            HandleDeviceRemoved = DeviceRemoved;
            HandleDeviceValueReceived = DeviceValueReceived;

            hidmanager = CreateHIDManager();
            RegisterHIDCallbacks(hidmanager);
        }

        #endregion

         #region Private Members

        IOHIDManagerRef CreateHIDManager()
        {
            return NativeMethods.IOHIDManagerCreate(IntPtr.Zero, IntPtr.Zero);
        }

        // Registers callbacks for device addition and removal. These callbacks
        // are called when we run the loop in CheckDevicesMode
        void RegisterHIDCallbacks(IOHIDManagerRef hidmanager)
        {
            NativeMethods.IOHIDManagerRegisterDeviceMatchingCallback(
                hidmanager, HandleDeviceAdded, IntPtr.Zero);
            NativeMethods.IOHIDManagerRegisterDeviceRemovalCallback(
                hidmanager, HandleDeviceRemoved, IntPtr.Zero);
            NativeMethods.IOHIDManagerScheduleWithRunLoop(hidmanager,
                RunLoop, InputLoopMode);

            NativeMethods.IOHIDManagerSetDeviceMatching(hidmanager, DeviceTypes.Ref);
            NativeMethods.IOHIDManagerOpen(hidmanager, IOOptionBits.Zero);

            OpenTK.Platform.MacOS.Carbon.CF.CFRunLoopRunInMode(InputLoopMode, 0.0, true);
        }

        void DeviceAdded(IntPtr context, IOReturn res, IntPtr sender, IOHIDDeviceRef device)
        {
            if (NativeMethods.IOHIDDeviceOpen(device, IOOptionBits.Zero) == IOReturn.Zero)
            {
                if (NativeMethods.IOHIDDeviceConformsTo(device,
                        HIDPage.GenericDesktop, (int)HIDUsageGD.Mouse))
                {
                    if (!MouseDevices.ContainsKey(device))
                    {
                        Debug.Print("Mouse device {0:x} discovered, sender is {1:x}", device, sender);
                        MouseState state = new MouseState();
                        state.IsConnected = true;
                        MouseIndexToDevice.Add(MouseDevices.Count, device);
                        MouseDevices.Add(device, state);
                    }
                    else
                    {
                        Debug.Print("Mouse device {0:x} reconnected, sender is {1:x}", device, sender);
                        MouseState state = MouseDevices[device];
                        state.IsConnected = true;
                        MouseDevices[device] = state;
                    }
                }

                if (NativeMethods.IOHIDDeviceConformsTo(device,
                        HIDPage.GenericDesktop, (int)HIDUsageGD.Keyboard))
                {
                    if (!KeyboardDevices.ContainsKey(device))
                    {
                        Debug.Print("Keyboard device {0:x} discovered, sender is {1:x}", device, sender);
                        KeyboardState state = new KeyboardState();
                        state.IsConnected = true;
                        KeyboardIndexToDevice.Add(KeyboardDevices.Count, device);
                        KeyboardDevices.Add(device, state);
                    }
                    else
                    {
                        Debug.Print("Keyboard device {0:x} reconnected, sender is {1:x}", device, sender);
                        KeyboardState state = KeyboardDevices[device];
                        state.IsConnected = true;
                        KeyboardDevices[device] = state;
                    }
                }

                // The device is not normally available in the InputValueCallback (HandleDeviceValueReceived), so we include
                // the device identifier as the context variable, so we can identify it and figure out the device later.
                // Thanks to Jase: http://www.opentk.com/node/2800
                NativeMethods.IOHIDDeviceRegisterInputValueCallback(device,
                    HandleDeviceValueReceived, device);

                NativeMethods.IOHIDDeviceScheduleWithRunLoop(device, RunLoop, InputLoopMode);
            }
        }

        void DeviceRemoved(IntPtr context, IOReturn res, IntPtr sender, IOHIDDeviceRef device)
        {
            if (NativeMethods.IOHIDDeviceConformsTo(device, HIDPage.GenericDesktop, (int)HIDUsageGD.Mouse) &&
                MouseDevices.ContainsKey(device))
            {
                Debug.Print("Mouse device {0:x} disconnected, sender is {1:x}", device, sender);

                // Keep the device in case it comes back later on
                MouseState state = MouseDevices[device];
                state.IsConnected = false;
                MouseDevices[device] = state;
            }

            if (NativeMethods.IOHIDDeviceConformsTo(device, HIDPage.GenericDesktop, (int)HIDUsageGD.Keyboard) &&
                KeyboardDevices.ContainsKey(device))
            {
                Debug.Print("Keyboard device {0:x} disconnected, sender is {1:x}", device, sender);

                // Keep the device in case it comes back later on
                KeyboardState state = KeyboardDevices[device];
                state.IsConnected = false;
                KeyboardDevices[device] = state;
            }

            NativeMethods.IOHIDDeviceRegisterInputValueCallback(device, IntPtr.Zero, IntPtr.Zero);
            NativeMethods.IOHIDDeviceUnscheduleWithRunLoop(device, RunLoop, InputLoopMode);
        }

        void DeviceValueReceived(IntPtr context, IOReturn res, IntPtr sender, IOHIDValueRef val)
        {
            if (disposed)
            {
                Debug.Print("DeviceValueReceived({0}, {1}, {2}, {3}) called on disposed {4}",
                    context, res, sender, val, GetType());
                return;
            }

            MouseState mouse;
            KeyboardState keyboard;
            if (MouseDevices.TryGetValue(context, out mouse))
            {
                MouseDevices[context] = UpdateMouse(mouse, val);
            }
            else if (KeyboardDevices.TryGetValue(context, out keyboard))
            {
                KeyboardDevices[context] = UpdateKeyboard(keyboard, val);
            }else{
                //Debug.Print ("Device {0:x} not found in list of keyboards or mice", sender);
            }
        }

        static MouseState UpdateMouse(MouseState state, IOHIDValueRef val)
        {
            IOHIDElementRef elem = NativeMethods.IOHIDValueGetElement(val);
            int v_int = NativeMethods.IOHIDValueGetIntegerValue(val).ToInt32();
            //double v_physical = NativeMethods.IOHIDValueGetScaledValue(val, IOHIDValueScaleType.Physical);
            //double v_calbrated = NativeMethods.IOHIDValueGetScaledValue(val, IOHIDValueScaleType.Calibrated);
            HIDPage page = NativeMethods.IOHIDElementGetUsagePage(elem);
            int usage = NativeMethods.IOHIDElementGetUsage(elem);

            switch (page)
            {
                case HIDPage.GenericDesktop:
                    switch ((HIDUsageGD)usage)
                    {
                        case HIDUsageGD.X:
                            state.X += v_int;
                            break;

                        case HIDUsageGD.Y:
                            state.Y += v_int;
                            break;

                        case HIDUsageGD.Wheel:
                            state.WheelPrecise += v_int;
                            break;
                    }
                    break;

                case HIDPage.Button:
                    state[OpenTK.Input.MouseButton.Left + usage - 1] = v_int == 1;
                    break;
            }

            return state;
        }

        static KeyboardState UpdateKeyboard(KeyboardState state, IOHIDValueRef val)
        {
            IOHIDElementRef elem = NativeMethods.IOHIDValueGetElement(val);
            int v_int = NativeMethods.IOHIDValueGetIntegerValue(val).ToInt32();
            HIDPage page = NativeMethods.IOHIDElementGetUsagePage(elem);
            int usage = NativeMethods.IOHIDElementGetUsage(elem);
 
            // This will supress the debug printing below. Seems like it generates a lot of -1s. 
            // Couldn't find any details in USB spec or Apple docs for this behavior.
            if(usage < 0 ) return state;  

            switch (page)
            {
                case HIDPage.GenericDesktop:
                case HIDPage.KeyboardOrKeypad:
                    if (usage >= RawKeyMap.Length)
                    {
                        Debug.Print("[Warning] Key {0} not mapped.", usage);
                        return state;
                    }
                    state.SetKeyState(RawKeyMap[usage], (byte)usage, v_int != 0);
                    break;
            }

            return state;
        }

        #endregion

        #region IInputDriver2 Members

        public IMouseDriver2 MouseDriver { get { return this; } }
        public IKeyboardDriver2 KeyboardDriver { get { return this; } }
        public IGamePadDriver GamePadDriver { get { throw new NotImplementedException(); } }

        #endregion

        #region IMouseDriver2 Members

        MouseState IMouseDriver2.GetState()
        {
            MouseState master = new MouseState();
            foreach (KeyValuePair<IntPtr, MouseState> item in MouseDevices)
            {
                master.MergeBits(item.Value);
            }

            return master;
        }

        MouseState IMouseDriver2.GetState(int index)
        {
            IntPtr device;
            if (MouseIndexToDevice.TryGetValue(index, out device))
            {
                return MouseDevices[device];
            }

            return new MouseState();
        }

        void IMouseDriver2.SetPosition(double x, double y)
        {
            CG.SetLocalEventsSuppressionInterval(0.0);
            CG.WarpMouseCursorPosition(new Carbon.HIPoint(x, y));
        }

        #endregion

        #region IKeyboardDriver2

        KeyboardState IKeyboardDriver2.GetState()
        {
            KeyboardState master = new KeyboardState();
            foreach (KeyValuePair<IntPtr, KeyboardState> item in KeyboardDevices)
            {
                master.MergeBits(item.Value);
            }

            return master;
        }

        KeyboardState IKeyboardDriver2.GetState(int index)
        {
            IntPtr device;
            if (KeyboardIndexToDevice.TryGetValue(index, out device))
            {
                return KeyboardDevices[device];
            }

            return new KeyboardState();
        }

        string IKeyboardDriver2.GetDeviceName(int index)
        {
            IntPtr device;
            if (KeyboardIndexToDevice.TryGetValue(index, out device))
            {
                IntPtr vendor_id = NativeMethods.IOHIDDeviceGetProperty(device, NativeMethods.IOHIDVendorIDKey);
                IntPtr product_id = NativeMethods.IOHIDDeviceGetProperty(device, NativeMethods.IOHIDProductIDKey);
                // Todo: find out the real vendor/product name from the relevant ids.
                return String.Format("{0}:{1}", vendor_id, product_id);
            }
            return String.Empty;
        }

        #endregion

        #region NativeMethods

        class NativeMethods
        {
            const string hid = "/System/Library/Frameworks/IOKit.framework/Versions/Current/IOKit";

            public static readonly CFString IOHIDVendorIDKey = CF.CFSTR("VendorID");
            public static readonly CFString IOHIDVendorIDSourceKey = CF.CFSTR("VendorIDSource");
            public static readonly CFString IOHIDProductIDKey = CF.CFSTR("ProductID");
            public static readonly CFString IOHIDVersionNumberKey = CF.CFSTR("VersionNumber");
            public static readonly CFString IOHIDManufacturerKey = CF.CFSTR("Manufacturer");
            public static readonly CFString IOHIDProductKey = CF.CFSTR("Product");
            public static readonly CFString IOHIDDeviceUsageKey = CF.CFSTR("DeviceUsage");
            public static readonly CFString IOHIDDeviceUsagePageKey = CF.CFSTR("DeviceUsagePage");
            public static readonly CFString IOHIDDeviceUsagePairsKey = CF.CFSTR("DeviceUsagePairs");

            [DllImport(hid)]
            public static extern IOHIDManagerRef IOHIDManagerCreate(
                CFAllocatorRef allocator, IOOptionBits options) ;

            // This routine will be called when a new (matching) device is connected.
            [DllImport(hid)]
            public static extern void IOHIDManagerRegisterDeviceMatchingCallback(
                IOHIDManagerRef inIOHIDManagerRef,
                IOHIDDeviceCallback inIOHIDDeviceCallback,
                IntPtr inContext);

            [DllImport(hid)]
            public static extern void IOHIDManagerRegisterDeviceMatchingCallback(
                IOHIDManagerRef inIOHIDManagerRef,
                IntPtr inIOHIDDeviceCallback,
                IntPtr inContext);

            // This routine will be called when a (matching) device is disconnected.
            [DllImport(hid)]
            public static extern void IOHIDManagerRegisterDeviceRemovalCallback(
                IOHIDManagerRef inIOHIDManagerRef,
                IOHIDDeviceCallback inIOHIDDeviceCallback,
                IntPtr inContext);

            [DllImport(hid)]
            public static extern void IOHIDManagerRegisterDeviceRemovalCallback(
                IOHIDManagerRef inIOHIDManagerRef,
                IntPtr inIOHIDDeviceCallback,
                IntPtr inContext);

            [DllImport(hid)]
            public static extern void IOHIDManagerScheduleWithRunLoop(
                IOHIDManagerRef inIOHIDManagerRef,
                CFRunLoop inCFRunLoop,
                CFString inCFRunLoopMode);

            [DllImport(hid)]
            public static extern void IOHIDManagerSetDeviceMatching(
                IOHIDManagerRef manager,
                CFDictionaryRef matching) ;

            [DllImport(hid)]
            public static extern IOReturn IOHIDManagerOpen(
                IOHIDManagerRef manager,
                IOOptionBits options) ;

            [DllImport(hid)]
            public static extern IOReturn IOHIDDeviceOpen(
                IOHIDDeviceRef manager,
                IOOptionBits opts);

            [DllImport(hid)]
            public static extern CFTypeRef IOHIDDeviceGetProperty(
                IOHIDDeviceRef device,
                CFStringRef key);

            [DllImport(hid)]
            public static extern bool IOHIDDeviceConformsTo(
                IOHIDDeviceRef inIOHIDDeviceRef,  // IOHIDDeviceRef for the HID device
                HIDPage inUsagePage,      // the usage page to test conformance with
                int inUsage);         // the usage to test conformance with

            [DllImport(hid)]
            public static extern void IOHIDDeviceRegisterInputValueCallback(
                IOHIDDeviceRef device,
                IOHIDValueCallback callback,
                IntPtr context);

            [DllImport(hid)]
            public static extern void IOHIDDeviceRegisterInputValueCallback(
                IOHIDDeviceRef device,
                IntPtr callback,
                IntPtr context);

            [DllImport(hid)]
            public static extern void IOHIDDeviceScheduleWithRunLoop(
                IOHIDDeviceRef device,
                CFRunLoop inCFRunLoop,
                CFString inCFRunLoopMode);

            [DllImport(hid)]
            public static extern void IOHIDDeviceUnscheduleWithRunLoop(
                IOHIDDeviceRef device,
                CFRunLoop inCFRunLoop,
                CFString inCFRunLoopMode);

            [DllImport(hid)]
            public static extern IOHIDElementRef IOHIDValueGetElement(IOHIDValueRef @value);

            [DllImport(hid)]
            public static extern CFIndex IOHIDValueGetIntegerValue(IOHIDValueRef @value);

            [DllImport(hid)]
            public static extern double IOHIDValueGetScaledValue(
                IOHIDValueRef @value,
                IOHIDValueScaleType type) ;

            [DllImport(hid)]
            public static extern int IOHIDElementGetUsage(IOHIDElementRef elem);

            [DllImport(hid)]
            public static extern HIDPage IOHIDElementGetUsagePage(IOHIDElementRef elem);

            public delegate void IOHIDDeviceCallback(IntPtr ctx, IOReturn res, IntPtr sender, IOHIDDeviceRef device);
            public delegate void IOHIDValueCallback(IntPtr ctx, IOReturn res, IntPtr sender, IOHIDValueRef val);
        }

        enum IOHIDValueScaleType
        {
            Physical, // [device min, device max]
            Calibrated // [-1, +1]
        }

        enum HIDPage
        {
            Undefined  = 0x00,
            GenericDesktop = 0x01,
            Simulation = 0x02,
            VR = 0x03,
            Sport  = 0x04,
            Game   = 0x05,
            /* Reserved 0x06 */
            KeyboardOrKeypad   = 0x07, /* USB Device Class Definition for Human Interface Devices (HID). Note: the usage type for all key codes is Selector (Sel). */
            LEDs   = 0x08,
            Button = 0x09,
            Ordinal    = 0x0A,
            Telephony  = 0x0B,
            Consumer   = 0x0C,
            Digitizer  = 0x0D,
            /* Reserved 0x0E */
            PID    = 0x0F, /* USB Physical Interface Device definitions for force feedback and related devices. */
            Unicode    = 0x10,
            /* Reserved 0x11 - 0x13 */
            AlphanumericDisplay    = 0x14,
            /* Reserved 0x15 - 0x7F */
            /* Monitor 0x80 - 0x83   USB Device Class Definition for Monitor Devices */
            /* Power 0x84 - 0x87     USB Device Class Definition for Power Devices */
            PowerDevice = 0x84,                /* Power Device Page */
            BatterySystem = 0x85,              /* Battery System Page */
            /* Reserved 0x88 - 0x8B */
            BarCodeScanner = 0x8C, /* (Point of Sale) USB Device Class Definition for Bar Code Scanner Devices */
            WeighingDevice = 0x8D, /* (Point of Sale) USB Device Class Definition for Weighing Devices */
            Scale  = 0x8D, /* (Point of Sale) USB Device Class Definition for Scale Devices */
            MagneticStripeReader = 0x8E,
            /* ReservedPointofSalepages 0x8F */
            CameraControl  = 0x90, /* USB Device Class Definition for Image Class Devices */
            Arcade = 0x91, /* OAAF Definitions for arcade and coinop related Devices */
            /* Reserved 0x92 - 0xFEFF */
            /* VendorDefined 0xFF00 - 0xFFFF */
            VendorDefinedStart = 0xFF00
        }

        // Generic desktop usage
        enum HIDUsageGD
        {
            Pointer    = 0x01, /* Physical Collection */
            Mouse  = 0x02, /* Application Collection */
            /* 0x03 Reserved */
            Joystick   = 0x04, /* Application Collection */
            GamePad    = 0x05, /* Application Collection */
            Keyboard   = 0x06, /* Application Collection */
            Keypad = 0x07, /* Application Collection */
            MultiAxisController    = 0x08, /* Application Collection */
            /* 0x09 - 0x2F Reserved */
            X  = 0x30, /* Dynamic Value */
            Y  = 0x31, /* Dynamic Value */
            Z  = 0x32, /* Dynamic Value */
            Rx = 0x33, /* Dynamic Value */
            Ry = 0x34, /* Dynamic Value */
            Rz = 0x35, /* Dynamic Value */
            Slider = 0x36, /* Dynamic Value */
            Dial   = 0x37, /* Dynamic Value */
            Wheel  = 0x38, /* Dynamic Value */
            Hatswitch  = 0x39, /* Dynamic Value */
            CountedBuffer  = 0x3A, /* Logical Collection */
            ByteCount  = 0x3B, /* Dynamic Value */
            MotionWakeup   = 0x3C, /* One-Shot Control */
            Start  = 0x3D, /* On/Off Control */
            Select = 0x3E, /* On/Off Control */
            /* 0x3F Reserved */
            Vx = 0x40, /* Dynamic Value */
            Vy = 0x41, /* Dynamic Value */
            Vz = 0x42, /* Dynamic Value */
            Vbrx   = 0x43, /* Dynamic Value */
            Vbry   = 0x44, /* Dynamic Value */
            Vbrz   = 0x45, /* Dynamic Value */
            Vno    = 0x46, /* Dynamic Value */
            /* 0x47 - 0x7F Reserved */
            SystemControl  = 0x80, /* Application Collection */
            SystemPowerDown    = 0x81, /* One-Shot Control */
            SystemSleep    = 0x82, /* One-Shot Control */
            SystemWakeUp   = 0x83, /* One-Shot Control */
            SystemContextMenu  = 0x84, /* One-Shot Control */
            SystemMainMenu = 0x85, /* One-Shot Control */
            SystemAppMenu  = 0x86, /* One-Shot Control */
            SystemMenuHelp = 0x87, /* One-Shot Control */
            SystemMenuExit = 0x88, /* One-Shot Control */
            SystemMenu = 0x89, /* Selector */
            SystemMenuRight    = 0x8A, /* Re-Trigger Control */
            SystemMenuLeft = 0x8B, /* Re-Trigger Control */
            SystemMenuUp   = 0x8C, /* Re-Trigger Control */
            SystemMenuDown = 0x8D, /* Re-Trigger Control */
            /* 0x8E - 0x8F Reserved */
            DPadUp = 0x90, /* On/Off Control */
            DPadDown   = 0x91, /* On/Off Control */
            DPadRight  = 0x92, /* On/Off Control */
            DPadLeft   = 0x93, /* On/Off Control */
            /* 0x94 - 0xFFFF Reserved */
            Reserved = 0xFFFF
        }

        enum HIDButton
        {
            Button_1  = 0x01, /* (primary/trigger) */
            Button_2  = 0x02, /* (secondary) */
            Button_3  = 0x03, /* (tertiary) */
            Button_4  = 0x04, /* 4th button */
            /* ... */
            Button_65535  = 0xFFFF
        }

        enum HIDKey
        {
            ErrorRollOver = 0x01, /* ErrorRollOver */
            POSTFail  = 0x02, /* POSTFail */
            ErrorUndefined    = 0x03, /* ErrorUndefined */
            A = 0x04, /* a or A */
            B = 0x05, /* b or B */
            C = 0x06, /* c or C */
            D = 0x07, /* d or D */
            E = 0x08, /* e or E */
            F = 0x09, /* f or F */
            G = 0x0A, /* g or G */
            H = 0x0B, /* h or H */
            I = 0x0C, /* i or I */
            J = 0x0D, /* j or J */
            K = 0x0E, /* k or K */
            L = 0x0F, /* l or L */
            M = 0x10, /* m or M */
            N = 0x11, /* n or N */
            O = 0x12, /* o or O */
            P = 0x13, /* p or P */
            Q = 0x14, /* q or Q */
            R = 0x15, /* r or R */
            S = 0x16, /* s or S */
            T = 0x17, /* t or T */
            U = 0x18, /* u or U */
            V = 0x19, /* v or V */
            W = 0x1A, /* w or W */
            X = 0x1B, /* x or X */
            Y = 0x1C, /* y or Y */
            Z = 0x1D, /* z or Z */
            Number1 = 0x1E, /* 1 or ! */
            Number2 = 0x1F, /* 2 or @ */
            Number3 = 0x20, /* 3 or # */
            Number4 = 0x21, /* 4 or $ */
            Number5 = 0x22, /* 5 or % */
            Number6 = 0x23, /* 6 or ^ */
            Number7 = 0x24, /* 7 or & */
            Number8 = 0x25, /* 8 or * */
            Number9 = 0x26, /* 9 or ( */
            Number0 = 0x27, /* 0 or ) */
            ReturnOrEnter = 0x28, /* Return (Enter) */
            Escape    = 0x29, /* Escape */
            DeleteOrBackspace = 0x2A, /* Delete (Backspace) */
            Tab   = 0x2B, /* Tab */
            Spacebar  = 0x2C, /* Spacebar */
            Hyphen    = 0x2D, /* - or _ */
            EqualSign = 0x2E, /* = or + */
            OpenBracket   = 0x2F, /* [ or { */
            CloseBracket  = 0x30, /* ] or } */
            Backslash = 0x31, /* \ or | */
            NonUSPound    = 0x32, /* Non-US # or _ */
            Semicolon = 0x33, /* ; or : */
            Quote = 0x34, /* ' or " */
            GraveAccentAndTilde   = 0x35, /* Grave Accent and Tilde */
            Comma = 0x36, /* , or < */
            Period    = 0x37, /* . or > */
            Slash = 0x38, /* / or ? */
            CapsLock  = 0x39, /* Caps Lock */
            F1    = 0x3A, /* F1 */
            F2    = 0x3B, /* F2 */
            F3    = 0x3C, /* F3 */
            F4    = 0x3D, /* F4 */
            F5    = 0x3E, /* F5 */
            F6    = 0x3F, /* F6 */
            F7    = 0x40, /* F7 */
            F8    = 0x41, /* F8 */
            F9    = 0x42, /* F9 */
            F10   = 0x43, /* F10 */
            F11   = 0x44, /* F11 */
            F12   = 0x45, /* F12 */
            PrintScreen   = 0x46, /* Print Screen */
            ScrollLock    = 0x47, /* Scroll Lock */
            Pause = 0x48, /* Pause */
            Insert    = 0x49, /* Insert */
            Home  = 0x4A, /* Home */
            PageUp    = 0x4B, /* Page Up */
            DeleteForward = 0x4C, /* Delete Forward */
            End   = 0x4D, /* End */
            PageDown  = 0x4E, /* Page Down */
            RightArrow    = 0x4F, /* Right Arrow */
            LeftArrow = 0x50, /* Left Arrow */
            DownArrow = 0x51, /* Down Arrow */
            UpArrow   = 0x52, /* Up Arrow */
            KeypadNumLock = 0x53, /* Keypad NumLock or Clear */
            KeypadSlash   = 0x54, /* Keypad / */
            KeypadAsterisk    = 0x55, /* Keypad * */
            KeypadHyphen  = 0x56, /* Keypad - */
            KeypadPlus    = 0x57, /* Keypad + */
            KeypadEnter   = 0x58, /* Keypad Enter */
            Keypad1   = 0x59, /* Keypad 1 or End */
            Keypad2   = 0x5A, /* Keypad 2 or Down Arrow */
            Keypad3   = 0x5B, /* Keypad 3 or Page Down */
            Keypad4   = 0x5C, /* Keypad 4 or Left Arrow */
            Keypad5   = 0x5D, /* Keypad 5 */
            Keypad6   = 0x5E, /* Keypad 6 or Right Arrow */
            Keypad7   = 0x5F, /* Keypad 7 or Home */
            Keypad8   = 0x60, /* Keypad 8 or Up Arrow */
            Keypad9   = 0x61, /* Keypad 9 or Page Up */
            Keypad0   = 0x62, /* Keypad 0 or Insert */
            KeypadPeriod  = 0x63, /* Keypad . or Delete */
            NonUSBackslash    = 0x64, /* Non-US \ or | */
            Application   = 0x65, /* Application */
            Power = 0x66, /* Power */
            KeypadEqualSign   = 0x67, /* Keypad = */
            F13   = 0x68, /* F13 */
            F14   = 0x69, /* F14 */
            F15   = 0x6A, /* F15 */
            F16   = 0x6B, /* F16 */
            F17   = 0x6C, /* F17 */
            F18   = 0x6D, /* F18 */
            F19   = 0x6E, /* F19 */
            F20   = 0x6F, /* F20 */
            F21   = 0x70, /* F21 */
            F22   = 0x71, /* F22 */
            F23   = 0x72, /* F23 */
            F24   = 0x73, /* F24 */
            Execute   = 0x74, /* Execute */
            Help  = 0x75, /* Help */
            Menu  = 0x76, /* Menu */
            Select    = 0x77, /* Select */
            Stop  = 0x78, /* Stop */
            Again = 0x79, /* Again */
            Undo  = 0x7A, /* Undo */
            Cut   = 0x7B, /* Cut */
            Copy  = 0x7C, /* Copy */
            Paste = 0x7D, /* Paste */
            Find  = 0x7E, /* Find */
            Mute  = 0x7F, /* Mute */
            VolumeUp  = 0x80, /* Volume Up */
            VolumeDown    = 0x81, /* Volume Down */
            LockingCapsLock   = 0x82, /* Locking Caps Lock */
            LockingNumLock    = 0x83, /* Locking Num Lock */
            LockingScrollLock = 0x84, /* Locking Scroll Lock */
            KeypadComma   = 0x85, /* Keypad Comma */
            KeypadEqualSignAS400  = 0x86, /* Keypad Equal Sign for AS/400 */
            International1    = 0x87, /* International1 */
            International2    = 0x88, /* International2 */
            International3    = 0x89, /* International3 */
            International4    = 0x8A, /* International4 */
            International5    = 0x8B, /* International5 */
            International6    = 0x8C, /* International6 */
            International7    = 0x8D, /* International7 */
            International8    = 0x8E, /* International8 */
            International9    = 0x8F, /* International9 */
            LANG1 = 0x90, /* LANG1 */
            LANG2 = 0x91, /* LANG2 */
            LANG3 = 0x92, /* LANG3 */
            LANG4 = 0x93, /* LANG4 */
            LANG5 = 0x94, /* LANG5 */
            LANG6 = 0x95, /* LANG6 */
            LANG7 = 0x96, /* LANG7 */
            LANG8 = 0x97, /* LANG8 */
            LANG9 = 0x98, /* LANG9 */
            AlternateErase    = 0x99, /* AlternateErase */
            SysReqOrAttention = 0x9A, /* SysReq/Attention */
            Cancel    = 0x9B, /* Cancel */
            Clear = 0x9C, /* Clear */
            Prior = 0x9D, /* Prior */
            Return    = 0x9E, /* Return */
            Separator = 0x9F, /* Separator */
            Out   = 0xA0, /* Out */
            Oper  = 0xA1, /* Oper */
            ClearOrAgain  = 0xA2, /* Clear/Again */
            CrSelOrProps  = 0xA3, /* CrSel/Props */
            ExSel = 0xA4, /* ExSel */
            /* 0xA5-0xDF Reserved */
            LeftControl   = 0xE0, /* Left Control */
            LeftShift = 0xE1, /* Left Shift */
            LeftAlt   = 0xE2, /* Left Alt */
            LeftGUI   = 0xE3, /* Left GUI */
            RightControl  = 0xE4, /* Right Control */
            RightShift    = 0xE5, /* Right Shift */
            RightAlt  = 0xE6, /* Right Alt */
            RightGUI  = 0xE7, /* Right GUI */
            /* 0xE8-0xFFFF Reserved */
            //_Reserved = 0xFFFF
        }

        // Maps HIDKey to OpenTK.Input.Key.
        static readonly Key[] RawKeyMap = new Key[]
        {
            Key.Unknown,
            Key.Unknown, /* ErrorRollOver */
            Key.Unknown,  /* POSTFail */
            Key.Unknown, /* ErrorUndefined */
            Key.A, /* a or A */
            Key.B, /* b or B */
            Key.C, /* c or C */
            Key.D, /* d or D */
            Key.E, /* e or E */
            Key.F, /* f or F */
            Key.G, /* g or G */
            Key.H, /* h or H */
            Key.I, /* i or I */
            Key.J, /* j or J */
            Key.K, /* k or K */
            Key.L, /* l or L */
            Key.M, /* m or M */
            Key.N, /* n or N */
            Key.O, /* o or O */
            Key.P, /* p or P */
            Key.Q, /* q or Q */
            Key.R, /* r or R */
            Key.S, /* s or S */
            Key.T, /* t or T */
            Key.U, /* u or U */
            Key.V, /* v or V */
            Key.W, /* w or W */
            Key.X, /* x or X */
            Key.Y, /* y or Y */
            Key.Z, /* z or Z */
            Key.Number1, /* 1 or ! */
            Key.Number2, /* 2 or @ */
            Key.Number3, /* 3 or # */
            Key.Number4, /* 4 or $ */
            Key.Number5, /* 5 or % */
            Key.Number6, /* 6 or ^ */
            Key.Number7, /* 7 or & */
            Key.Number8, /* 8 or * */
            Key.Number9, /* 9 or ( */
            Key.Number0, /* 0 or ) */
            Key.Enter, /* Return (Enter) */
            Key.Escape, /* Escape */
            Key.BackSpace, /* Delete (Backspace) */
            Key.Tab, /* Tab */
            Key.Space, /* Spacebar */
            Key.Minus, /* - or _ */
            Key.Plus, /* = or + */
            Key.BracketLeft, /* [ or { */
            Key.BracketRight, /* ] or } */
            Key.BackSlash, /* \ or | */
            Key.Minus, /* Non-US # or _ */
            Key.Semicolon, /* ; or : */
            Key.Quote, /* ' or " */
            Key.Tilde, /* Grave Accent and Tilde */
            Key.Comma, /* , or < */
            Key.Period, /* . or > */
            Key.Slash, /* / or ? */
            Key.CapsLock, /* Caps Lock */
            Key.F1, /* F1 */
            Key.F2, /* F2 */
            Key.F3, /* F3 */
            Key.F4, /* F4 */
            Key.F5, /* F5 */
            Key.F6, /* F6 */
            Key.F7, /* F7 */
            Key.F8, /* F8 */
            Key.F9, /* F9 */
            Key.F10, /* F10 */
            Key.F11, /* F11 */
            Key.F12, /* F12 */
            Key.PrintScreen, /* Print Screen */
            Key.ScrollLock, /* Scroll Lock */
            Key.Pause, /* Pause */
            Key.Insert, /* Insert */
            Key.Home, /* Home */
            Key.PageUp, /* Page Up */
            Key.Delete, /* Delete Forward */
            Key.End, /* End */
            Key.PageDown, /* Page Down */
            Key.Right, /* Right Arrow */
            Key.Left, /* Left Arrow */
            Key.Down, /* Down Arrow */
            Key.Up, /* Up Arrow */
            Key.NumLock, /* Keypad NumLock or Clear */
            Key.KeypadDivide, /* Keypad / */
            Key.KeypadMultiply, /* Keypad * */
            Key.KeypadMinus, /* Keypad - */
            Key.KeypadPlus, /* Keypad + */
            Key.KeypadEnter, /* Keypad Enter */
            Key.Keypad1, /* Keypad 1 or End */
            Key.Keypad2, /* Keypad 2 or Down Arrow */
            Key.Keypad3, /* Keypad 3 or Page Down */
            Key.Keypad4, /* Keypad 4 or Left Arrow */
            Key.Keypad5, /* Keypad 5 */
            Key.Keypad6, /* Keypad 6 or Right Arrow */
            Key.Keypad7, /* Keypad 7 or Home */
            Key.Keypad8, /* Keypad 8 or Up Arrow */
            Key.Keypad9, /* Keypad 9 or Page Up */
            Key.Keypad0, /* Keypad 0 or Insert */
            Key.KeypadDecimal, /* Keypad . or Delete */
            Key.BackSlash, /* Non-US \ or | */
            Key.Unknown, /* Application */
            Key.Unknown, /* Power */
            Key.Unknown, /* Keypad = */
            Key.F13, /* F13 */
            Key.F14, /* F14 */
            Key.F15, /* F15 */
            Key.F16, /* F16 */
            Key.F17, /* F17 */
            Key.F18, /* F18 */
            Key.F19, /* F19 */
            Key.F20, /* F20 */
            Key.F21, /* F21 */
            Key.F22, /* F22 */
            Key.F23, /* F23 */
            Key.F24, /* F24 */
            Key.Unknown, /* Execute */
            Key.Unknown, /* Help */
            Key.Menu, /* Menu */
            Key.Unknown, /* Select */
            Key.Unknown, /* Stop */
            Key.Unknown, /* Again */
            Key.Unknown, /* Undo */
            Key.Unknown, /* Cut */
            Key.Unknown, /* Copy */
            Key.Unknown, /* Paste */
            Key.Unknown, /* Find */
            Key.Unknown, /* Mute */
            Key.Unknown, /* Volume Up */
            Key.Unknown, /* Volume Down */
            Key.CapsLock, /* Locking Caps Lock */
            Key.NumLock , /* Locking Num Lock */
            Key.ScrollLock, /* Locking Scroll Lock */
            Key.KeypadDecimal, /* Keypad Comma */
            Key.Unknown, /* Keypad Equal Sign for AS/400 */
            Key.Unknown, /* International1 */
            Key.Unknown, /* International2 */
            Key.Unknown, /* International3 */
            Key.Unknown, /* International4 */
            Key.Unknown, /* International5 */
            Key.Unknown, /* International6 */
            Key.Unknown, /* International7 */
            Key.Unknown, /* International8 */
            Key.Unknown, /* International9 */
            Key.Unknown, /* LANG1 */
            Key.Unknown, /* LANG2 */
            Key.Unknown, /* LANG3 */
            Key.Unknown, /* LANG4 */
            Key.Unknown, /* LANG5 */
            Key.Unknown, /* LANG6 */
            Key.Unknown, /* LANG7 */
            Key.Unknown, /* LANG8 */
            Key.Unknown, /* LANG9 */
            Key.Unknown, /* AlternateErase */
            Key.Unknown, /* SysReq/Attention */
            Key.Unknown, /* Cancel */
            Key.Unknown, /* Clear */
            Key.Unknown, /* Prior */
            Key.Enter, /* Return */
            Key.Unknown, /* Separator */
            Key.Unknown, /* Out */
            Key.Unknown, /* Oper */
            Key.Unknown, /* Clear/Again */
            Key.Unknown, /* CrSel/Props */
            Key.Unknown, /* ExSel */
            /* 0xA5-0xDF Reserved */
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            Key.LControl, /* Left Control */
            Key.LShift, /* Left Shift */
            Key.LAlt, /* Left Alt */
            Key.LWin, /* Left GUI */
            Key.RControl, /* Right Control */
            Key.RShift, /* Right Shift */
            Key.RAlt, /* Right Alt */
            Key.RWin, /* Right GUI */
            /* 0xE8-0xFFFF Reserved */
        };

        #endregion

        #region IDisposable Members


        void Dispose(bool manual)
        {
            if (!disposed)
            {
                if (manual)
                {
                    NativeMethods.IOHIDManagerRegisterDeviceMatchingCallback(
                        hidmanager, IntPtr.Zero, IntPtr.Zero);
                    NativeMethods.IOHIDManagerRegisterDeviceRemovalCallback(
                        hidmanager, IntPtr.Zero, IntPtr.Zero);
                    NativeMethods.IOHIDManagerScheduleWithRunLoop(
                        hidmanager, IntPtr.Zero, IntPtr.Zero);

                    foreach (var device in MouseDevices.Keys)
                    {
                        NativeMethods.IOHIDDeviceRegisterInputValueCallback(
                            device, IntPtr.Zero, IntPtr.Zero);
                    }

                    foreach (var device in KeyboardDevices.Keys)
                    {
                        NativeMethods.IOHIDDeviceRegisterInputValueCallback(
                            device, IntPtr.Zero, IntPtr.Zero);
                    }

                    HandleDeviceAdded = null;
                    HandleDeviceRemoved = null;
                    HandleDeviceValueReceived = null;
                }
                else
                {
                    Debug.Print("{0} leaked, did you forget to call Dispose()?", GetType());
                }
                disposed = true;
            }
        }

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        ~HIDInput()
        {
            Dispose(false);
        }

        #endregion
    }
}