/*
 * synergy -- mouse and keyboard sharing utility
 * Copyright (C) 2012-2016 Symless Ltd.
 * Copyright (C) 2004 Chris Schoeneman
 * 
 * This package is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * found in the file LICENSE that should have accompanied this file.
 * 
 * This package 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "arch/win32/ArchSystemWindows.h"
#include "arch/win32/ArchMiscWindows.h"
#include "arch/win32/XArchWindows.h"

#include "tchar.h"
#include <string>

#include <windows.h>
#include <psapi.h>

static const char* s_settingsKeyNames[] = {
    _T("SOFTWARE"),
    _T("Synergy"),
    NULL
};

//
// ArchSystemWindows
//

ArchSystemWindows::ArchSystemWindows()
{
    // do nothing
}

ArchSystemWindows::~ArchSystemWindows()
{
    // do nothing
}

std::string
ArchSystemWindows::getOSName() const
{
    std::string osName ("Microsoft Windows <unknown>");
    static const TCHAR* const windowsVersionKeyNames[] = {
        _T("SOFTWARE"),
        _T("Microsoft"),
        _T("Windows NT"),
        _T("CurrentVersion"),
        NULL
    };

    HKEY key = ArchMiscWindows::openKey(HKEY_LOCAL_MACHINE, windowsVersionKeyNames);
    if (key == NULL) {
        return osName;
    }

    std::string productName = ArchMiscWindows::readValueString(key, "ProductName");
    if (osName.empty()) {
        return osName;
    }

    return "Microsoft " + productName;
}

std::string
ArchSystemWindows::getPlatformName() const
{
#ifdef _X86_
    if (isWOW64())
        return "x86 (WOW64)";
    else
        return "x86";
#else
#ifdef _AMD64_
    return "x64";
#else
    return "Unknown";
#endif
#endif
}

std::string
ArchSystemWindows::setting(const std::string& valueName) const
{
    HKEY key = ArchMiscWindows::openKey(HKEY_LOCAL_MACHINE, s_settingsKeyNames);
    if (key == NULL)
        return "";

    return ArchMiscWindows::readValueString(key, valueName.c_str());
}

void
ArchSystemWindows::setting(const std::string& valueName, const std::string& valueString) const
{
    HKEY key = ArchMiscWindows::addKey(HKEY_LOCAL_MACHINE, s_settingsKeyNames);
    if (key == NULL)
        throw XArch(std::string("could not access registry key: ") + valueName);
    ArchMiscWindows::setValue(key, valueName.c_str(), valueString.c_str());
}

bool
ArchSystemWindows::isWOW64() const
{
#if WINVER >= _WIN32_WINNT_WINXP
    typedef BOOL (WINAPI *LPFN_ISWOW64PROCESS) (HANDLE, PBOOL);
    HMODULE hModule = GetModuleHandle(TEXT("kernel32"));
    if (!hModule) return FALSE;

    LPFN_ISWOW64PROCESS fnIsWow64Process =
        (LPFN_ISWOW64PROCESS) GetProcAddress(hModule, "IsWow64Process");

    BOOL bIsWow64 = FALSE;
    if (NULL != fnIsWow64Process &&
        fnIsWow64Process(GetCurrentProcess(), &bIsWow64) &&
        bIsWow64)
    {
        return true;
    }
#endif
    return false;
}
