// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
// Manually defined WMI COM struct following CsWin32 struct-based COM patterns.
// WMI interfaces are not in Win32 metadata, so they cannot be generated by CsWin32.
// Pattern follows dotnet/sdk ISetupConfiguration.cs (src/Cli/dotnet/Microsoft/VisualStudio/Setup/Configuration/).
 
using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Runtime.Versioning;
using Windows.Win32;
using Windows.Win32.Foundation;
 
namespace Microsoft.Build.Shared.Win32.Wmi;
 
/// <summary>
///  Used to enumerate CIM objects returned by <see cref="IWbemServices.ExecQuery"/>.
/// </summary>
/// <remarks>
///  <see href="https://learn.microsoft.com/windows/win32/api/wbemcli/nn-wbemcli-ienumwbemclassobject"/>
/// </remarks>
[SupportedOSPlatform("windows6.0")]
internal unsafe struct IEnumWbemClassObject : IComIID
{
    public static Guid Guid { get; } = new(0x027947E1, 0xD731, 0x11CE, 0xA3, 0x57, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01);
 
    static ref readonly Guid IComIID.Guid
    {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        get
        {
            ReadOnlySpan<byte> data =
            [
                0xE1, 0x47, 0x79, 0x02,
                0x31, 0xD7,
                0xCE, 0x11,
                0xA3, 0x57, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01
            ];
 
            return ref Unsafe.As<byte, Guid>(ref MemoryMarshal.GetReference(data));
        }
    }
 
    private readonly void** _lpVtbl;
 
    // IUnknown methods (vtable indices 0-2)
 
    public HRESULT QueryInterface(Guid* riid, void** ppvObject)
    {
        fixed (IEnumWbemClassObject* pThis = &this)
        {
            return ((delegate* unmanaged[Stdcall]<IEnumWbemClassObject*, Guid*, void**, HRESULT>)_lpVtbl[0])(pThis, riid, ppvObject);
        }
    }
 
    public uint AddRef()
    {
        fixed (IEnumWbemClassObject* pThis = &this)
        {
            return ((delegate* unmanaged[Stdcall]<IEnumWbemClassObject*, uint>)_lpVtbl[1])(pThis);
        }
    }
 
    public uint Release()
    {
        fixed (IEnumWbemClassObject* pThis = &this)
        {
            return ((delegate* unmanaged[Stdcall]<IEnumWbemClassObject*, uint>)_lpVtbl[2])(pThis);
        }
    }
 
    // IEnumWbemClassObject vtable layout (indices 3-7):
    //   3 = Reset
    //   4 = Next              <-- Used
    //   5 = NextAsync
    //   6 = Clone
    //   7 = Skip
 
    /// <summary>
    ///  Retrieves the next object(s) in the enumeration, waiting up to a specified timeout.
    /// </summary>
    /// <remarks>
    ///  <see href="https://learn.microsoft.com/windows/win32/api/wbemcli/nf-wbemcli-ienumwbemclassobject-next"/>
    /// </remarks>
    public HRESULT Next(int lTimeout, uint uCount, IWbemClassObject** apObjects, uint* puReturned)
    {
        fixed (IEnumWbemClassObject* pThis = &this)
        {
            return ((delegate* unmanaged[Stdcall]<IEnumWbemClassObject*, int, uint, IWbemClassObject**, uint*, HRESULT>)_lpVtbl[4])(
                pThis, lTimeout, uCount, apObjects, puReturned);
        }
    }
}