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#include "config.h"
#if ENABLE(INPUT_TYPE_MONTH)
#include "MonthInputType.h"

#include "HTMLInputElement.h"
#include "HTMLNames.h"
#include "InputTypeNames.h"
#include <wtf/DateMath.h>
#include <wtf/MathExtras.h>
#include <wtf/NeverDestroyed.h>

namespace WebCore {

using namespace HTMLNames;

static const int monthDefaultStep = 1;
static const int monthDefaultStepBase = 0;
static const int monthStepScaleFactor = 1;
static const StepRange::StepDescription monthStepDescription { monthDefaultStep, monthDefaultStepBase, monthStepScaleFactor, StepRange::ParsedStepValueShouldBeInteger };

const AtomicString& MonthInputType::formControlType() const
{
    return InputTypeNames::month();
}

DateComponents::Type MonthInputType::dateType() const
{
    return DateComponents::Month;
}

double MonthInputType::valueAsDate() const
{
    ASSERT(element());
    DateComponents date;
    if (!parseToDateComponents(element()->value(), &date))
        return DateComponents::invalidMilliseconds();
    double msec = date.millisecondsSinceEpoch();
    ASSERT(std::isfinite(msec));
    return msec;
}

String MonthInputType::serializeWithMilliseconds(double value) const
{
    DateComponents date;
    if (!date.setMillisecondsSinceEpochForMonth(value))
        return String();
    return serializeWithComponents(date);
}

Decimal MonthInputType::defaultValueForStepUp() const
{
    double current = WallTime::now().secondsSinceEpoch().milliseconds();
    int offset = calculateLocalTimeOffset(current).offset / msPerMinute;
    current += offset * msPerMinute;

    DateComponents date;
    date.setMillisecondsSinceEpochForMonth(current);
    double months = date.monthsSinceEpoch();
    ASSERT(std::isfinite(months));
    return Decimal::fromDouble(months);
}

StepRange MonthInputType::createStepRange(AnyStepHandling anyStepHandling) const
{
    ASSERT(element());
    const Decimal stepBase = parseToNumber(element()->attributeWithoutSynchronization(minAttr), Decimal::fromDouble(monthDefaultStepBase));
    const Decimal minimum = parseToNumber(element()->attributeWithoutSynchronization(minAttr), Decimal::fromDouble(DateComponents::minimumMonth()));
    const Decimal maximum = parseToNumber(element()->attributeWithoutSynchronization(maxAttr), Decimal::fromDouble(DateComponents::maximumMonth()));
    const Decimal step = StepRange::parseStep(anyStepHandling, monthStepDescription, element()->attributeWithoutSynchronization(stepAttr));
    return StepRange(stepBase, RangeLimitations::Valid, minimum, maximum, step, monthStepDescription);
}

Decimal MonthInputType::parseToNumber(const String& src, const Decimal& defaultValue) const
{
    DateComponents date;
    if (!parseToDateComponents(src, &date))
        return defaultValue;
    double months = date.monthsSinceEpoch();
    ASSERT(std::isfinite(months));
    return Decimal::fromDouble(months);
}

bool MonthInputType::parseToDateComponentsInternal(const UChar* characters, unsigned length, DateComponents* out) const
{
    ASSERT(out);
    unsigned end;
    return out->parseMonth(characters, length, 0, end) && end == length;
}

bool MonthInputType::setMillisecondToDateComponents(double value, DateComponents* date) const
{
    ASSERT(date);
    return date->setMonthsSinceEpoch(value);
}

bool MonthInputType::isMonthField() const
{
    return true;
}

} // namespace WebCore

#endif