/*
 *	PROGRAM:	Client/Server Common Code
 *	MODULE:		config_root.cpp
 *	DESCRIPTION:	Configuration manager (platform specific - linux/posix)
 *
 * 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.
 * You may obtain a copy of the Licence at
 * http://www.gnu.org/licences/lgpl.html
 * 
 * As a special exception this file can also be included in modules
 * with other source code as long as that source code has been 
 * released under an Open Source Initiative certificed licence.  
 * More information about OSI certification can be found at: 
 * http://www.opensource.org 
 * 
 * This module 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 Licence for more details.
 * 
 * This module was created by members of the firebird development 
 * team.  All individual contributions remain the Copyright (C) of 
 * those individuals and all rights are reserved.  Contributors to 
 * this file are either listed below or can be obtained from a CVS 
 * history command.
 *
 *  Created by:  Mark O'Donohue <skywalker@users.sourceforge.net>
 *
 *  Contributor(s):
 */

#include "firebird.h"

#include <windows.h>

#include "fb_types.h"
#include "fb_string.h"

#include "../jrd/os/config_root.h"
#include "../jrd/os/path_utils.h"
#include "../utilities/install/registry.h"

typedef Firebird::string string;

static const char *REGISTRY_KEY = "RootDirectory";
static const char *CONFIG_FILE = "firebird.conf";

/******************************************************************************
 *
 *	Platform-specific root locator
 */

void getRootFromRegistry(TEXT *buffer, DWORD buffer_length)
{
	HKEY hkey;
	DWORD type;

	if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_KEY_ROOT_CUR_VER,
		0, KEY_QUERY_VALUE, &hkey) != ERROR_SUCCESS)
	{
		return;
	}

	RegQueryValueEx(hkey, REGISTRY_KEY, NULL, &type,
		reinterpret_cast<UCHAR*>(buffer), &buffer_length);
	RegCloseKey(hkey);
}

ConfigRoot::ConfigRoot()
{
	TEXT buffer[MAXPATHLEN];

	buffer[0] = 0;

	// check the registry first
#if !defined(EMBEDDED)
	getRootFromRegistry(buffer, sizeof(buffer));
#endif
	if (buffer[0])
	{
		root_dir = buffer;
		if (root_dir.rfind(PathUtils::dir_sep) != root_dir.length() - 1)
		{
			root_dir += PathUtils::dir_sep;
		}
		return;
	}

	// get the pathname of the running executable
	GetModuleFileName(NULL, buffer, sizeof(buffer));
	string bin_dir = buffer;
	
	// get rid of the filename
	int index = bin_dir.rfind(PathUtils::dir_sep);
	bin_dir = bin_dir.substr(0, index);

	// how should we decide to use bin_dir instead of root_dir? any ideas?
	// ???
#if defined(EMBEDDED)
	root_dir = bin_dir + PathUtils::dir_sep;
	return;
#endif

	// go to the parent directory
	index = bin_dir.rfind(PathUtils::dir_sep, bin_dir.length());
	root_dir = (index ? bin_dir.substr(0, index) : bin_dir) + PathUtils::dir_sep;
}

const char *ConfigRoot::getRootDirectory() const
{
	return root_dir.c_str();
}

const char *ConfigRoot::getConfigFile() const
{
	static string file = root_dir + string(CONFIG_FILE);
	return file.c_str();
}