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#include "windows.h"

#include <QDateTime>

#include <chrono>

void FileTimeToDateTime(const FILETIME *source, QDateTime *target)
{
    ULARGE_INTEGER store;
    store.QuadPart  = source->dwHighDateTime;
    store.QuadPart  = store.QuadPart << 32;
    store.QuadPart += source->dwLowDateTime;

    const QDateTime tempDateTime(QDate(1601, 1, 1), QTime(0, 0, 0, 0), Qt::UTC);
    *target = tempDateTime.addMSecs(store.QuadPart / 10000);
}

void DateTimeToSystemTime(const QDateTime *source, SYSTEMTIME *target)
{
    target->wYear = source->date().year();
    target->wMonth = source->date().month();
    target->wDayOfWeek = source->date().dayOfWeek();
    target->wDay = source->date().day();
    target->wHour = source->time().hour();
    target->wMinute = source->time().minute();
    target->wSecond = source->time().second();
    target->wMilliseconds = source->time().msec();
}

void DateTimeToFileTime(const QDateTime &dateTime, FILETIME *target)
{
    const qint64 nsecs = QDateTime(QDate(1601, 1, 1), QTime(0, 0, 0, 0), Qt::UTC)
        .msecsTo(dateTime) * 10000;
    target->dwLowDateTime = nsecs;
    target->dwHighDateTime = nsecs >> 32;
}

BOOL WINAPI FileTimeToSystemTime(CONST FILETIME *source,SYSTEMTIME *target)
{
    QDateTime tempDateTime;
    FileTimeToDateTime(source, &tempDateTime);
    DateTimeToSystemTime(&tempDateTime, target);

    return TRUE;
}

BOOL WINAPI FileTimeToLocalFileTime(CONST FILETIME *source,FILETIME *target)
{
    target->dwHighDateTime = source->dwHighDateTime;
    target->dwLowDateTime  = source->dwLowDateTime;

    QDateTime tempDateTime;
    FileTimeToDateTime(source, &tempDateTime);

    tempDateTime = tempDateTime.toLocalTime();

    return TRUE;
}

BOOLEAN WINAPI RtlTimeToSecondsSince1970(const LARGE_INTEGER *Time, DWORD *Seconds)
{
    SYSTEMTIME tempSystemTime;
    FILETIME fileTime;

    fileTime.dwLowDateTime = Time->QuadPart;
    fileTime.dwHighDateTime = Time->QuadPart >> 32;

    FileTimeToSystemTime(&fileTime, &tempSystemTime);

    QDate targetDate(tempSystemTime.wYear, tempSystemTime.wMonth, tempSystemTime.wDay);
    QTime targetTime(tempSystemTime.wHour, tempSystemTime.wMinute, tempSystemTime.wSecond, tempSystemTime.wMilliseconds);
    QDateTime targetDateTime(targetDate, targetTime, Qt::UTC);

    quint64 secsSince1970 = targetDateTime.toMSecsSinceEpoch() / 1000;

    *Seconds = secsSince1970;

    return TRUE;
}

void WINAPI RtlSecondsSince1970ToFileTime(DWORD Seconds, FILETIME *ft)
{
    QDateTime fileTimeStartDate(QDate(1601, 1, 1));
    quint64 hnseconds = Seconds;
    QDateTime sourceDateTime = QDateTime::fromMSecsSinceEpoch(hnseconds * 1000);

    hnseconds = fileTimeStartDate.msecsTo(sourceDateTime);
    hnseconds *= 10000;

    ft->dwLowDateTime = hnseconds;
    ft->dwHighDateTime = hnseconds >> 32;
}

VOID WINAPI GetSystemTime(SYSTEMTIME *st)
{
    QDateTime nowDateTime = QDateTime::currentDateTimeUtc();
    DateTimeToSystemTime(&nowDateTime, st);
}

VOID WINAPI GetSystemTimeAsFileTime(FILETIME *time)
{
    DateTimeToFileTime(QDateTime::currentDateTimeUtc(), time);
}

DWORD WINAPI GetTickCount()
{
    using namespace std::chrono;
    return duration_cast<milliseconds>(steady_clock::now().time_since_epoch()).count();
}