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 * modification, are permitted provided that the following conditions are
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 *
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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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#include "config.h"
#include "MonthInputType.h"

#include "DateComponents.h"
#include "HTMLInputElement.h"
#include "HTMLNames.h"
#include <wtf/CurrentTime.h>
#include <wtf/DateMath.h>
#include <wtf/MathExtras.h>
#include <wtf/PassOwnPtr.h>

namespace WebCore {

using namespace HTMLNames;

static const double monthDefaultStep = 1.0;
static const double monthStepScaleFactor = 1.0;

PassOwnPtr<InputType> MonthInputType::create(HTMLInputElement* element)
{
    return adoptPtr(new MonthInputType(element));
}

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

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

void MonthInputType::setValueAsDate(double value, ExceptionCode&) const
{
    DateComponents date;
    if (!date.setMillisecondsSinceEpochForMonth(value)) {
        element()->setValue(String());
        return;
    }
    element()->setValue(date.toString());
}

double MonthInputType::defaultValueForStepUp() const
{
    double current = currentTimeMS();
    double utcOffset = calculateUTCOffset();
    double dstOffset = calculateDSTOffset(current, utcOffset);
    int offset = static_cast<int>((utcOffset + dstOffset) / msPerMinute);
    current += offset * msPerMinute;

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

double MonthInputType::minimum() const
{
    return parseToDouble(element()->fastGetAttribute(minAttr), DateComponents::minimumMonth());
}

double MonthInputType::maximum() const
{
    return parseToDouble(element()->fastGetAttribute(maxAttr), DateComponents::maximumMonth());
}

double MonthInputType::defaultStep() const
{
    return monthDefaultStep;
}

double MonthInputType::stepScaleFactor() const
{
    return monthStepScaleFactor;
}

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

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

} // namespace WebCore