#region License
//
// HidProtocol.cs
//
// Author:
//       Stefanos A. <stapostol@gmail.com>
//
// Copyright (c) 2014 Stefanos Apostolopoulos
//
// 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.Runtime.InteropServices;
using System.Security;
using System.Text;
using OpenTK.Platform.Common;

namespace OpenTK.Platform.Windows
{
    class HidProtocol
    {
        const string lib = "hid.dll";

        [SuppressUnmanagedCodeSecurity]
        [DllImport(lib, SetLastError = true, EntryPoint = "HidP_GetButtonCaps")]
        public static extern HidProtocolStatus GetButtonCaps(HidProtocolReportType hidProtocolReportType,
            IntPtr button_caps, ref ushort p, IntPtr preparsed_data);

        [SuppressUnmanagedCodeSecurity]
        [DllImport(lib, SetLastError = true, EntryPoint = "HidP_GetCaps")]
        public static extern HidProtocolStatus GetCaps(IntPtr preparsed_data, ref HidProtocolCaps capabilities);

        [SuppressUnmanagedCodeSecurity]
        [DllImport(lib, SetLastError = true, EntryPoint = "HidP_GetData")]
        public static extern HidProtocolStatus GetData(HidProtocolReportType type,
            IntPtr data, ref int data_length,
            IntPtr preparsed_data, IntPtr report, int report_length);

        [SuppressUnmanagedCodeSecurity]
        [DllImport(lib, SetLastError = true, EntryPoint = "HidP_GetScaledUsageValue")]
        static public extern HidProtocolStatus GetScaledUsageValue(HidProtocolReportType type,
            HIDPage usage_page, short link_collection, short usage, ref int usage_value,
            IntPtr preparsed_data, IntPtr report, int report_length);

        [SuppressUnmanagedCodeSecurity]
        [DllImport(lib, SetLastError = true, EntryPoint = "HidP_GetUsageValue")]
        public static extern HidProtocolStatus GetUsageValue(HidProtocolReportType type,
            HIDPage usage_page, short link_collection, short usage, ref uint usage_value,
            IntPtr preparsed_data, IntPtr report, int report_length);

        [SuppressUnmanagedCodeSecurity]
        [DllImport(lib, SetLastError = true, EntryPoint = "HidP_GetValueCaps")]
        public static extern HidProtocolStatus GetValueCaps(HidProtocolReportType type, IntPtr caps,
            ref ushort caps_length, IntPtr preparsed_data);

        [SuppressUnmanagedCodeSecurity]
        [DllImport(lib, SetLastError = true, EntryPoint = "HidP_MaxDataListLength")]
        public static extern int MaxDataListLength(HidProtocolReportType type, IntPtr preparsed_data);
    }

    enum HidProtocolReportType : ushort
    {
        Input,
        Output,
        Feature
    }

    enum HidProtocolStatus
    {
        Success = 0x00110000,
    }

    [StructLayout(LayoutKind.Explicit)]
    struct HidProtocolButtonCaps
    {
        [FieldOffset(0)] public HIDPage UsagePage;
        [FieldOffset(2)] public byte ReportID;
        [FieldOffset(3), MarshalAs(UnmanagedType.U1)] public bool IsAlias;
        [FieldOffset(4)] public short BitField;
        [FieldOffset(6)] public short LinkCollection;
        [FieldOffset(8)] public short LinkUsage;
        [FieldOffset(10)] public short LinkUsagePage;
        [FieldOffset(12), MarshalAs(UnmanagedType.U1)] public bool IsRange;
        [FieldOffset(13), MarshalAs(UnmanagedType.U1)] public bool IsStringRange;
        [FieldOffset(14), MarshalAs(UnmanagedType.U1)] public bool IsDesignatorRange;
        [FieldOffset(15), MarshalAs(UnmanagedType.U1)] public bool IsAbsolute;
        //[FieldOffset(16)] unsafe fixed int Reserved[10]; // no need when LayoutKind.Explicit
        [FieldOffset(56)] public HidProtocolRange Range;
        [FieldOffset(56)] public HidProtocolNotRange NotRange;
    }

    struct HidProtocolCaps
    {
        public short Usage;
        public short UsagePage;
        public ushort InputReportByteLength;
        public ushort OutputReportByteLength;
        public ushort FeatureReportByteLength;
        unsafe fixed ushort Reserved[17];
        public ushort NumberLinkCollectionNodes;
        public ushort NumberInputButtonCaps;
        public ushort NumberInputValueCaps;
        public ushort NumberInputDataIndices;
        public ushort NumberOutputButtonCaps;
        public ushort NumberOutputValueCaps;
        public ushort NumberOutputDataIndices;
        public ushort NumberFeatureButtonCaps;
        public ushort NumberFeatureValueCaps;
        public ushort NumberFeatureDataIndices;
    }

    [StructLayout(LayoutKind.Explicit)]
    public struct HidProtocolData
    {
        [FieldOffset(0)] public short DataIndex;
        //[FieldOffset(2)] public short Reserved;
        [FieldOffset(4)] public int RawValue;
        [FieldOffset(4), MarshalAs(UnmanagedType.U1)] public bool On;
    }

    struct HidProtocolNotRange
    {
        public short Usage;
        short Reserved1;
        public short StringIndex;
        short Reserved2;
        public short DesignatorIndex;
        short Reserved3;
        public short DataIndex;
        short Reserved4;
    }

    struct HidProtocolRange
    {
        public short UsageMin;
        public short UsageMax;
        public short StringMin;
        public short StringMax;
        public short DesignatorMin;
        public short DesignatorMax;
        public short DataIndexMin;
        public short DataIndexMax;
    }

    [StructLayout(LayoutKind.Explicit)]
    struct HidProtocolValueCaps
    {
        [FieldOffset(0)] public HIDPage UsagePage;
        [FieldOffset(2)] public byte ReportID;
        [FieldOffset(3), MarshalAs(UnmanagedType.U1)] public bool IsAlias;
        [FieldOffset(4)] public ushort BitField;
        [FieldOffset(6)] public ushort LinkCollection;
        [FieldOffset(8)] public ushort LinkUsage;
        [FieldOffset(10)] public ushort LinkUsagePage;
        [FieldOffset(12), MarshalAs(UnmanagedType.U1)] public bool IsRange;
        [FieldOffset(13), MarshalAs(UnmanagedType.U1)] public bool IsStringRange;
        [FieldOffset(14), MarshalAs(UnmanagedType.U1)] public bool IsDesignatorRange;
        [FieldOffset(15), MarshalAs(UnmanagedType.U1)] public bool IsAbsolute;
        [FieldOffset(16), MarshalAs(UnmanagedType.U1)] public bool HasNull;
        [FieldOffset(17)] byte Reserved;
        [FieldOffset(18)] public short BitSize;
        [FieldOffset(20)] public short ReportCount;
        //[FieldOffset(22)] ushort Reserved2a;
        //[FieldOffset(24)] ushort Reserved2b;
        //[FieldOffset(26)] ushort Reserved2c;
        //[FieldOffset(28)] ushort Reserved2d;
        //[FieldOffset(30)] ushort Reserved2e;
        [FieldOffset(32)] public int UnitsExp;
        [FieldOffset(36)] public int Units;
        [FieldOffset(40)] public int LogicalMin;
        [FieldOffset(44)] public int LogicalMax;
        [FieldOffset(48)] public int PhysicalMin;
        [FieldOffset(52)] public int PhysicalMax;
        [FieldOffset(56)] public HidProtocolRange Range;
        [FieldOffset(56)] public HidProtocolNotRange NotRange;
    }
}