using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace DTS.DASLib.Connection.USBFramework
{
    public sealed class HIDDeclarations
    {

        // API Declarations for communicating with HID-class devices.

        // ******************************************************************************
        // API constants
        // ******************************************************************************

        // from hidpi.h
        // Typedef enum defines a set of integer constants for HidP_Report_Type
        public const short HidP_Input = 0;
        public const short HidP_Output = 1;
        public const short HidP_Feature = 2;

        // ******************************************************************************
        // Structures and classes for API calls, listed alphabetically
        // ******************************************************************************

        [StructLayout(LayoutKind.Sequential)]
        public struct HIDD_ATTRIBUTES
        {
            public int Size;
            public short VendorID;
            public short ProductID;
            public short VersionNumber;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct HIDP_CAPS
        {
            public short Usage;
            public short UsagePage;
            public short InputReportByteLength;
            public short OutputReportByteLength;
            public short FeatureReportByteLength;
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 17)]
            public short[] Reserved;
            public short NumberLinkCollectionNodes;
            public short NumberInputButtonCaps;
            public short NumberInputValueCaps;
            public short NumberInputDataIndices;
            public short NumberOutputButtonCaps;
            public short NumberOutputValueCaps;
            public short NumberOutputDataIndices;
            public short NumberFeatureButtonCaps;
            public short NumberFeatureValueCaps;
            public short NumberFeatureDataIndices;

        }

        // If IsRange is false, UsageMin is the Usage and UsageMax is unused.
        // If IsStringRange is false, StringMin is the string index and StringMax is unused.
        // If IsDesignatorRange is false, DesignatorMin is the designator index and DesignatorMax is unused.

        [StructLayout(LayoutKind.Sequential)]
        public struct HidP_Value_Caps
        {
            public short UsagePage;
            public byte ReportID;
            public int IsAlias;
            public short BitField;
            public short LinkCollection;
            public short LinkUsage;
            public short LinkUsagePage;
            public int IsRange;
            public int IsStringRange;
            public int IsDesignatorRange;
            public int IsAbsolute;
            public int HasNull;
            public byte Reserved;
            public short BitSize;
            public short ReportCount;
            public short Reserved2;
            public short Reserved3;
            public short Reserved4;
            public short Reserved5;
            public short Reserved6;
            public int LogicalMin;
            public int LogicalMax;
            public int PhysicalMin;
            public int PhysicalMax;
            public short UsageMin;
            public short UsageMax;
            public short StringMin;
            public short StringMax;
            public short DesignatorMin;
            public short DesignatorMax;
            public short DataIndexMin;
            public short DataIndexMax;
        }

        // ******************************************************************************
        // API functions, listed alphabetically
        // ******************************************************************************

        [DllImport("hid.dll")]
        static public extern bool HidD_FlushQueue(int HidDeviceObject);

        [DllImport("hid.dll")]
        static public extern bool HidD_FreePreparsedData(ref IntPtr PreparsedData);

        [DllImport("hid.dll")]
        static public extern int HidD_GetAttributes(int HidDeviceObject, ref HIDD_ATTRIBUTES Attributes);

        [DllImport("hid.dll")]
        static public extern bool HidD_GetFeature(int HidDeviceObject, ref byte lpReportBuffer, int ReportBufferLength);

        [DllImport("hid.dll")]
        static public extern bool HidD_GetInputReport(int HidDeviceObject, ref byte lpReportBuffer, int ReportBufferLength);

        [DllImport("hid.dll")]
        static public extern void HidD_GetHidGuid(ref System.Guid HidGuid);

        [DllImport("hid.dll")]
        static public extern bool HidD_GetNumInputBuffers(int HidDeviceObject, ref int NumberBuffers);

        [DllImport("hid.dll")]
        static public extern bool HidD_GetPreparsedData(int HidDeviceObject, ref IntPtr PreparsedData);

        [DllImport("hid.dll")]
        static public extern bool HidD_SetFeature(int HidDeviceObject, ref byte lpReportBuffer, int ReportBufferLength);

        [DllImport("hid.dll")]
        static public extern bool HidD_SetNumInputBuffers(int HidDeviceObject, int NumberBuffers);

        [DllImport("hid.dll")]
        static public extern bool HidD_SetOutputReport(int HidDeviceObject, ref byte lpReportBuffer, int ReportBufferLength);

        [DllImport("hid.dll")]
        static public extern int HidP_GetCaps(IntPtr PreparsedData, ref HIDP_CAPS Capabilities);

        [DllImport("hid.dll")]
        static public extern int HidP_GetValueCaps(short ReportType, ref byte ValueCaps, ref short ValueCapsLength, IntPtr PreparsedData);

    }
}