/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/

#include "quickstarter.hxx"
#ifdef _MSC_VER
#pragma warning(push, 1) /* disable warnings within system headers */
#endif
#include <psapi.h>
#ifdef _MSC_VER
#pragma warning(pop)
#endif
#include <tlhelp32.h>
#include <malloc.h>

std::string GetOfficeInstallationPath(MSIHANDLE handle)
{
    std::string progpath;
    DWORD sz = 0;
    LPTSTR dummy = TEXT("");
    
    if (MsiGetProperty(handle, TEXT("INSTALLLOCATION"), dummy, &sz) == ERROR_MORE_DATA)
    {
        sz++; // space for the final '\0'
        DWORD nbytes = sz * sizeof(TCHAR);
        LPTSTR buff = reinterpret_cast<LPTSTR>(_alloca(nbytes));
        ZeroMemory(buff, nbytes);
        MsiGetProperty(handle, TEXT("INSTALLLOCATION"), buff, &sz);
        progpath = buff;            
    }
    return progpath;
}

std::string GetOfficeProductName(MSIHANDLE handle)
{
    std::string productname;
    DWORD sz = 0;
    LPTSTR dummy = TEXT("");
    
    if (MsiGetProperty(handle, TEXT("ProductName"), dummy, &sz) == ERROR_MORE_DATA)
    {
        sz++; // space for the final '\0'
        DWORD nbytes = sz * sizeof(TCHAR);
        LPTSTR buff = reinterpret_cast<LPTSTR>(_alloca(nbytes));
        ZeroMemory(buff, nbytes);
        MsiGetProperty(handle, TEXT("ProductName"), buff, &sz);
        productname = buff;            
    }
    return productname;
}

std::string GetQuickstarterLinkName(MSIHANDLE handle)
{
    std::string quickstarterlinkname;
    DWORD sz = 0;
    LPTSTR dummy = TEXT("");
    
    if (MsiGetProperty(handle, TEXT("Quickstarterlinkname"), dummy, &sz) == ERROR_MORE_DATA)
    {
        sz++; // space for the final '\0'
        DWORD nbytes = sz * sizeof(TCHAR);
        LPTSTR buff = reinterpret_cast<LPTSTR>(_alloca(nbytes));
        ZeroMemory(buff, nbytes);
        MsiGetProperty(handle, TEXT("Quickstarterlinkname"), buff, &sz);
        quickstarterlinkname = buff;            
    }
    else if (MsiGetProperty(handle, TEXT("ProductName"), dummy, &sz) == ERROR_MORE_DATA)
    {
        sz++; // space for the final '\0'
        DWORD nbytes = sz * sizeof(TCHAR);
        LPTSTR buff = reinterpret_cast<LPTSTR>(_alloca(nbytes));
        ZeroMemory(buff, nbytes);
        MsiGetProperty(handle, TEXT("ProductName"), buff, &sz);
        quickstarterlinkname = buff;            
    }
    return quickstarterlinkname;
}

inline bool IsValidHandle( HANDLE handle )
{
	return NULL != handle && INVALID_HANDLE_VALUE != handle;
}


static HANDLE WINAPI _CreateToolhelp32Snapshot( DWORD dwFlags, DWORD th32ProcessID )
{
	typedef HANDLE (WINAPI *FN_PROC)( DWORD dwFlags, DWORD th32ProcessID );
	static FN_PROC	lpProc = NULL;

	HANDLE	hSnapshot = NULL;

	if ( !lpProc )
	{
		HMODULE	hLibrary = GetModuleHandle("KERNEL32.DLL");

		if ( hLibrary )
			lpProc = reinterpret_cast< FN_PROC >(GetProcAddress( hLibrary, "CreateToolhelp32Snapshot" ));
	}

	if ( lpProc )
		hSnapshot = lpProc( dwFlags, th32ProcessID );

	return hSnapshot;
}

static BOOL WINAPI _Process32First( HANDLE hSnapshot, PROCESSENTRY32 *lppe32 )
{
	typedef BOOL (WINAPI *FN_PROC)( HANDLE hSnapshot, PROCESSENTRY32 *lppe32 );
	static FN_PROC	lpProc = NULL;

	BOOL	fSuccess = FALSE;

	if ( !lpProc )
	{
		HMODULE	hLibrary = GetModuleHandle("KERNEL32.DLL");

		if ( hLibrary )
			lpProc = reinterpret_cast< FN_PROC >(GetProcAddress( hLibrary, "Process32First" ));
	}

	if ( lpProc )
		fSuccess = lpProc( hSnapshot, lppe32 );

	return fSuccess;
}

static BOOL WINAPI _Process32Next( HANDLE hSnapshot, PROCESSENTRY32 *lppe32 )
{
	typedef BOOL (WINAPI *FN_PROC)( HANDLE hSnapshot, PROCESSENTRY32 *lppe32 );
	static FN_PROC	lpProc = NULL;

	BOOL	fSuccess = FALSE;

	if ( !lpProc )
	{
		HMODULE	hLibrary = GetModuleHandle("KERNEL32.DLL");

		if ( hLibrary )
			lpProc = reinterpret_cast< FN_PROC >(GetProcAddress( hLibrary, "Process32Next" ));
	}

	if ( lpProc )
		fSuccess = lpProc( hSnapshot, lppe32 );

	return fSuccess;
}

static std::string GetProcessImagePath_9x( DWORD dwProcessId )
{
	std::string	sImagePath;

	HANDLE	hSnapshot = _CreateToolhelp32Snapshot( TH32CS_SNAPPROCESS, 0 );

	if ( IsValidHandle( hSnapshot ) )
	{
		PROCESSENTRY32	pe32 = { 0 };

		pe32.dwSize = sizeof(PROCESSENTRY32);

		BOOL	fSuccess = _Process32First( hSnapshot, &pe32 );
		bool	found = false;

		while ( !found && fSuccess )
		{
			if ( pe32.th32ProcessID == dwProcessId )
			{
				found = true;
				sImagePath = pe32.szExeFile;
			}

			if ( !found )
				fSuccess = _Process32Next( hSnapshot, &pe32 );
		}

		CloseHandle( hSnapshot );
	}

	return sImagePath;
}

static DWORD WINAPI _GetModuleFileNameExA( HANDLE hProcess, HMODULE hModule, LPSTR lpFileName, DWORD nSize )
{
	typedef DWORD (WINAPI *FN_PROC)( HANDLE hProcess, HMODULE hModule, LPSTR lpFileName, DWORD nSize );

	static FN_PROC	lpProc = NULL;

	if ( !lpProc )
	{
		HMODULE	hLibrary = LoadLibrary("PSAPI.DLL");

		if ( hLibrary )
			lpProc = reinterpret_cast< FN_PROC >(GetProcAddress( hLibrary, "GetModuleFileNameExA" ));
	}

	if ( lpProc )
		return lpProc( hProcess, hModule, lpFileName, nSize );

	return 0;

}

static std::string GetProcessImagePath_NT( DWORD dwProcessId )
{
	std::string	sImagePath;

	HANDLE	hProcess = OpenProcess( PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, dwProcessId );

	if ( IsValidHandle( hProcess ) )
	{
		CHAR	szPathBuffer[MAX_PATH] = "";

		if ( _GetModuleFileNameExA( hProcess, NULL, szPathBuffer, sizeof(szPathBuffer) ) )
			sImagePath = szPathBuffer;

		CloseHandle( hProcess );
	}

	return sImagePath;
}

std::string GetProcessImagePath( DWORD dwProcessId )
{
	return (LONG)GetVersion() < 0 ? GetProcessImagePath_9x( dwProcessId ) : GetProcessImagePath_NT( dwProcessId );
}