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/**
 * @file
 * @short This file is included by qdatetimefns_p.h.
 * If you need includes in this file, put them in qdatetimefns_p.h, outside of the namespace.
 */

template<typename TSubClass>
Item ExtractFromDurationFN<TSubClass>::evaluateSingleton(const DynamicContext::Ptr &context) const
{
    const Item item(m_operands.first()->evaluateSingleton(context));
    if(item)
    {
        return static_cast<const TSubClass *>(this)->
               extract(item.as<AbstractDuration>());
    }
    else
        return Item();
}

Item YearsFromDurationFN::extract(const AbstractDuration *const duration) const
{
    return Integer::fromValue(duration->years() * (duration->isPositive() ? 1 : -1));
}

Item MonthsFromDurationFN::extract(const AbstractDuration *const duration) const
{
    return Integer::fromValue(duration->months() * (duration->isPositive() ? 1 : -1));
}

Item DaysFromDurationFN::extract(const AbstractDuration *const duration) const
{
    return Integer::fromValue(duration->days() * (duration->isPositive() ? 1 : -1));
}

Item HoursFromDurationFN::extract(const AbstractDuration *const duration) const
{
    return Integer::fromValue(duration->hours() * (duration->isPositive() ? 1 : -1));
}

Item MinutesFromDurationFN::extract(const AbstractDuration *const duration) const
{
    return Integer::fromValue(duration->minutes() * (duration->isPositive() ? 1 : -1));
}

Item SecondsFromDurationFN::extract(const AbstractDuration *const duration) const
{
    return toItem(Decimal::fromValue((duration->seconds() + duration->mseconds() / 1000.0) *
                                     (duration->isPositive() ? 1 : -1)));
}

template<typename TSubClass>
Item ExtractFromDateTimeFN<TSubClass>::evaluateSingleton(const DynamicContext::Ptr &context) const
{
    const Item item(m_operands.first()->evaluateSingleton(context));
    if(item)
    {
        return static_cast<const TSubClass *>(this)->
               extract(item.as<AbstractDateTime>()->toDateTime());
    }
    else
        return Item();
}

Item YearFromAbstractDateTimeFN::extract(const QDateTime &dt) const
{
    return Integer::fromValue(dt.date().year());
}

Item DayFromAbstractDateTimeFN::extract(const QDateTime &dt) const
{
    return Integer::fromValue(dt.date().day());
}

Item MinutesFromAbstractDateTimeFN::extract(const QDateTime &dt) const
{
    return Integer::fromValue(dt.time().minute());
}

Item SecondsFromAbstractDateTimeFN::extract(const QDateTime &dt) const
{
    const QTime time(dt.time());
    return toItem(Decimal::fromValue(time.second() + time.msec() / 1000.0));
}

Item TimezoneFromAbstractDateTimeFN::extract(const QDateTime &dt) const
{
    if(dt.timeSpec() == Qt::UTC)
        return toItem(CommonValues::DayTimeDurationZero);
    else if(dt.timeSpec() == Qt::OffsetFromUTC)
        return toItem(DayTimeDuration::fromSeconds(dt.utcOffset()));
    else
        return Item();
}

Item MonthFromAbstractDateTimeFN::extract(const QDateTime &dt) const
{
    return Integer::fromValue(dt.date().month());
}

Item HoursFromAbstractDateTimeFN::extract(const QDateTime &dt) const
{
    return Integer::fromValue(dt.time().hour());
}