// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0

#include "hostosinfo.h"

#include "filepath.h"
#include "utilstr.h"

#include <QDir>

#if !defined(QT_NO_OPENGL) && defined(QT_GUI_LIB)
#include <QOpenGLContext>
#endif

#ifdef Q_OS_LINUX
#include <sys/sysinfo.h>
#endif

#ifdef Q_OS_WIN
#include <qt_windows.h>
#endif

#ifdef Q_OS_MACOS
#include <sys/sysctl.h>
#endif

namespace Utils {

Qt::CaseSensitivity HostOsInfo::m_overrideFileNameCaseSensitivity = Qt::CaseSensitive;
bool HostOsInfo::m_useOverrideFileNameCaseSensitivity = false;

OsArch HostOsInfo::hostArchitecture()
{
#ifdef Q_OS_WIN
    // Workaround for Creator running in x86 emulation mode on ARM machines
    static const OsArch arch = []() {
        const HANDLE procHandle = GetCurrentProcess();
        ushort processMachine;
        ushort nativeMachine;
        if (IsWow64Process2(procHandle, &processMachine, &nativeMachine)
            && nativeMachine == IMAGE_FILE_MACHINE_ARM64) {
            return OsArchArm64;
        }

        return osArchFromString(QSysInfo::currentCpuArchitecture()).value_or(OsArchUnknown);
    }();
#else
    static const OsArch arch
        = osArchFromString(QSysInfo::currentCpuArchitecture()).value_or(OsArchUnknown);
#endif

    return arch;
}

void HostOsInfo::setOverrideFileNameCaseSensitivity(Qt::CaseSensitivity sensitivity)
{
    m_useOverrideFileNameCaseSensitivity = true;
    m_overrideFileNameCaseSensitivity = sensitivity;
}

void HostOsInfo::unsetOverrideFileNameCaseSensitivity()
{
    m_useOverrideFileNameCaseSensitivity = false;
}

bool HostOsInfo::canCreateOpenGLContext(QString *errorMessage)
{
#if defined(QT_NO_OPENGL) || !defined(QT_GUI_LIB)
    Q_UNUSED(errorMessage)
    return false;
#else
    static const bool canCreate = QOpenGLContext().create();
    if (!canCreate)
        *errorMessage = Tr::tr("Cannot create OpenGL context.");
    return canCreate;
#endif
}

std::optional<quint64> HostOsInfo::totalMemoryInstalledInBytes()
{
#ifdef Q_OS_LINUX
    struct sysinfo info;
    if (sysinfo(&info) == -1)
        return {};
    return info.totalram;
#elif defined(Q_OS_WIN)
    MEMORYSTATUSEX statex;
    statex.dwLength = sizeof statex;
    if (!GlobalMemoryStatusEx(&statex))
        return {};
    return statex.ullTotalPhys;
#elif defined(Q_OS_MACOS)
    int mib[] = {CTL_HW, HW_MEMSIZE};
    int64_t ram;
    size_t length = sizeof(int64_t);
    if (sysctl(mib, 2, &ram, &length, nullptr, 0) == -1)
        return {};
    return ram;
#endif
    return {};
}

const FilePath &HostOsInfo::root()
{
    static const FilePath rootDir = FilePath::fromUserInput(QDir::rootPath());
    return rootDir;
}

} // namespace Utils