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#include "filetime.h"

#include <QString>
#include <qt_windows.h>
#include <strsafe.h>

namespace qbs {
namespace Internal {

template<bool> struct CompileTimeAssert;
template<> struct CompileTimeAssert<true> {};

FileTime::FileTime()
    : m_fileTime(0)
{
    static CompileTimeAssert<sizeof(FileTime::InternalType) == sizeof(FILETIME)> internal_type_has_wrong_size;
    Q_UNUSED(internal_type_has_wrong_size);
}

bool FileTime::operator < (const FileTime &rhs) const
{
    const FILETIME *const t1 = reinterpret_cast<const FILETIME *>(&m_fileTime);
    const FILETIME *const t2 = reinterpret_cast<const FILETIME *>(&rhs.m_fileTime);
    return CompareFileTime(t1, t2) < 0;
}

void FileTime::clear()
{
    m_fileTime = 0;
}

bool FileTime::isValid() const
{
    return m_fileTime != 0;
}

FileTime FileTime::currentTime()
{
    FileTime result;
    SYSTEMTIME st;
    GetSystemTime(&st);
    FILETIME *const ft = reinterpret_cast<FILETIME *>(&result.m_fileTime);
    SystemTimeToFileTime(&st, ft);
    return result;
}

FileTime FileTime::oldestTime()
{
    SYSTEMTIME st = {
        1601,
        1,
        5,
        2
    };
    FileTime result;
    FILETIME *const ft = reinterpret_cast<FILETIME *>(&result.m_fileTime);
    SystemTimeToFileTime(&st, ft);
    return result;
}

QString FileTime::toString() const
{
    const FILETIME *const ft = reinterpret_cast<const FILETIME *>(&m_fileTime);
    SYSTEMTIME stUTC, stLocal;
    FileTimeToSystemTime(ft, &stUTC);
    SystemTimeToTzSpecificLocalTime(NULL, &stUTC, &stLocal);
    WCHAR szString[512];
    HRESULT hr = StringCchPrintf(szString, sizeof(szString) / sizeof(WCHAR),
                                 L"%02d.%02d.%d %02d:%02d:%02d:%02d",
                                 stLocal.wDay, stLocal.wMonth, stLocal.wYear,
                                 stLocal.wHour, stLocal.wMinute, stLocal.wSecond,
                                 stLocal.wMilliseconds);
    return SUCCEEDED(hr) ? QString::fromWCharArray(szString) : QString();
}

} // namespace Internal
} // namespace qbs
