using System;
using System.Runtime.InteropServices;

namespace Vanara.PInvoke
{
	public static partial class Shell32
	{
		/// <summary>Exposes a general mechanism for objects to offer services to other objects on the same host.</summary>
		/// <remarks>Objects that expose a service first call QueryInterface on their host for this interface, then execute IProfferService::ProfferService.</remarks>
		// https://docs.microsoft.com/en-us/windows/win32/api/shobjidl_core/nn-shobjidl_core-iprofferservice
		[PInvokeData("shobjidl_core.h", MSDNShortId = "NN:shobjidl_core.IProfferService")]
		[ComImport, Guid("cb728b20-f786-11ce-92ad-00aa00a74cd0"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
		public interface IProfferService
		{
			/// <summary>Makes a service available to other objects on the same host.</summary>
			/// <param name="guidService">
			/// <para>Type: <c>REFGUID</c></para>
			/// <para>A value of type <c>GUID</c> that specifies the service being offered.</para>
			/// </param>
			/// <param name="psp">
			/// <para>Type: <c>IServiceProvider*</c></para>
			/// <para>A pointer to an IServiceProvider interface.</para>
			/// </param>
			/// <param name="pdwCookie">
			/// <para>Type: <c>DWORD*</c></para>
			/// <para>
			/// A pointer to a <c>DWORD</c> that receives an implementation-defined value used for identification purposes. The calling
			/// application must keep track of this value for possible use in IProfferService::RevokeService.
			/// </para>
			/// </param>
			// https://docs.microsoft.com/en-us/windows/win32/api/shobjidl_core/nf-shobjidl_core-iprofferservice-profferservice HRESULT
			// ProfferService( REFGUID guidService, IServiceProvider *psp, DWORD *pdwCookie );
			void ProfferService(in Guid guidService, [In] IServiceProvider psp, out uint pdwCookie);

			/// <summary>Makes a service unavailable that had previously been available to other objects through IProfferService::ProfferService.</summary>
			/// <param name="dwCookie">
			/// <para>Type: <c>DWORD</c></para>
			/// <para>
			/// A value of type <c>DWORD</c> that specifies an implementation-defined value used for identification purposes. The calling
			/// application receives this value from IProfferService::ProfferService.
			/// </para>
			/// </param>
			// https://docs.microsoft.com/en-us/windows/win32/api/shobjidl_core/nf-shobjidl_core-iprofferservice-revokeservice HRESULT
			// RevokeService( DWORD dwCookie );
			void RevokeService(uint dwCookie);
		}

		/// <summary>Defines a mechanism for retrieving a service object; that is, an object that provides custom support to other objects.</summary>
		[ComImport, Guid("6d5140c1-7436-11ce-8034-00aa006009fa"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
		[PInvokeData("servprov.h")]
		public interface IServiceProvider
		{
			/// <summary>Performs as a factory for services that are exposed through an implementation of IServiceProvider.</summary>
			/// <param name="guidService">A unique identifier of the requested service.</param>
			/// <param name="riid">A unique identifier of the interface which the caller wishes to receive for the service.</param>
			/// <param name="ppvObject">The interface specified by the <paramref name="riid"/> parameter.</param>
			/// <returns>If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.</returns>
			[PreserveSig]
			HRESULT QueryService(in Guid guidService, in Guid riid, out IntPtr ppvObject); //[MarshalAs(UnmanagedType.Interface, IidParameterIndex = 1)] out object ppvObject);
		}
	}
}