/*
 *  Based on the genguid utility for WINE and ReactOS
 *
 *  Copyright 2003 Jonathan Wilson
 *  Copyright 2005 Steven Edwards
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include "../../pch.h"
#include "msvc.h"
#include <string>

using std::string;

#ifdef _WIN32
#include <objbase.h>
#include <stdio.h>

typedef HRESULT _stdcall CoInitializeFunc ( PVOID );
typedef void _stdcall CoUninitializeFunc ( void );
typedef HRESULT _stdcall CoCreateGuidFunc ( GUID* );

static CoInitializeFunc *pCoInitialize = NULL;
static CoUninitializeFunc *pCoUninitialize = NULL;
static CoCreateGuidFunc *pCoCreateGuid = NULL;


std::string
MSVCBackend::_gen_guid()
{
	GUID m_guid;
	HRESULT result;
	bool good_guid = false;
	static char guid[38];

	// Load ole32. We will need it later on
	HMODULE olelib = LoadLibrary ( "ole32.dll" );
	if ( olelib != NULL )
	{
		pCoInitialize = (CoInitializeFunc *)GetProcAddress( olelib, "CoInitialize" );
		pCoUninitialize = (CoUninitializeFunc *)GetProcAddress( olelib, "CoUninitialize" );
		pCoCreateGuid = (CoCreateGuidFunc *)GetProcAddress( olelib, "CoCreateGuid" );
		if ( !pCoInitialize || !pCoUninitialize || !pCoCreateGuid )
			printf ( "Missing exports from ole32.dll\n" );
		else
		{
			if (pCoInitialize(NULL) != S_OK)
				printf("Unable to initalize OLE libraries\n");
			else
			{
				result = pCoCreateGuid(&m_guid);
				if (result != S_OK)
					printf("Unable to create GUID\n");
				else
					good_guid = true;
				pCoUninitialize();
			}
		}
		FreeLibrary ( olelib );
	}
	if ( !good_guid )
	{
		// TODO FIXME - fall-back to random #'s
	}
	const char* strfmt = "%08lX-%04X-%04x-%02X%02X-%02X%02X%02X%02X%02X%02X";
	sprintf(guid, strfmt,m_guid.Data1,m_guid.Data2,m_guid.Data3,m_guid.Data4[0],
		m_guid.Data4[1],m_guid.Data4[2],m_guid.Data4[3],m_guid.Data4[4],m_guid.Data4[5],
		m_guid.Data4[6],m_guid.Data4[7],m_guid.Data1,m_guid.Data2,m_guid.Data3,m_guid.Data4[0],
		m_guid.Data4[1],m_guid.Data4[2],m_guid.Data4[3],m_guid.Data4[4],m_guid.Data4[5],
		m_guid.Data4[6],m_guid.Data4[7]);

	return guid;
}

#else /* Linux, etc */

std::string
MSVCBackend::_gen_guid()
{
	return std::string();
}
#endif /* WIN32/Linux */
