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#include "config.h"
#include "core/html/forms/MonthInputType.h"

#include "HTMLNames.h"
#include "InputTypeNames.h"
#include "core/html/HTMLInputElement.h"
#include "core/html/forms/DateTimeFieldsState.h"
#include "platform/DateComponents.h"
#include "platform/text/PlatformLocale.h"
#include "wtf/CurrentTime.h"
#include "wtf/DateMath.h"
#include "wtf/MathExtras.h"
#include "wtf/PassOwnPtr.h"
#include "wtf/text/WTFString.h"

namespace WebCore {

using namespace HTMLNames;

static const int monthDefaultStep = 1;
static const int monthDefaultStepBase = 0;
static const int monthStepScaleFactor = 1;

PassRefPtr<InputType> MonthInputType::create(HTMLInputElement& element)
{
    return adoptRef(new MonthInputType(element));
}

void MonthInputType::countUsage()
{
    countUsageIfVisible(UseCounter::InputTypeMonth);
}

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

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

double MonthInputType::valueAsDate() const
{
    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 = 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(std::isfinite(months));
    return Decimal::fromDouble(months);
}

StepRange MonthInputType::createStepRange(AnyStepHandling anyStepHandling) const
{
    DEFINE_STATIC_LOCAL(const StepRange::StepDescription, stepDescription, (monthDefaultStep, monthDefaultStepBase, monthStepScaleFactor, StepRange::ParsedStepValueShouldBeInteger));

    const Decimal stepBase = parseToNumber(element().fastGetAttribute(minAttr), Decimal::fromDouble(monthDefaultStepBase));
    const Decimal minimum = parseToNumber(element().fastGetAttribute(minAttr), Decimal::fromDouble(DateComponents::minimumMonth()));
    const Decimal maximum = parseToNumber(element().fastGetAttribute(maxAttr), Decimal::fromDouble(DateComponents::maximumMonth()));
    const Decimal step = StepRange::parseStep(anyStepHandling, stepDescription, element().fastGetAttribute(stepAttr));
    return StepRange(stepBase, minimum, maximum, step, stepDescription);
}

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 String& string, DateComponents* out) const
{
    ASSERT(out);
    unsigned end;
    return out->parseMonth(string, 0, end) && end == string.length();
}

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

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

#if ENABLE(INPUT_MULTIPLE_FIELDS_UI)
String MonthInputType::formatDateTimeFieldsState(const DateTimeFieldsState& dateTimeFieldsState) const
{
    if (!dateTimeFieldsState.hasMonth() || !dateTimeFieldsState.hasYear())
        return emptyString();
    return String::format("%04u-%02u", dateTimeFieldsState.year(), dateTimeFieldsState.month());
}

void MonthInputType::setupLayoutParameters(DateTimeEditElement::LayoutParameters& layoutParameters, const DateComponents& date) const
{
    layoutParameters.dateTimeFormat = layoutParameters.locale.monthFormat();
    layoutParameters.fallbackDateTimeFormat = "yyyy-MM";
    if (!parseToDateComponents(element().fastGetAttribute(minAttr), &layoutParameters.minimum))
        layoutParameters.minimum = DateComponents();
    if (!parseToDateComponents(element().fastGetAttribute(maxAttr), &layoutParameters.maximum))
        layoutParameters.maximum = DateComponents();
    layoutParameters.placeholderForMonth = "--";
    layoutParameters.placeholderForYear = "----";
}

bool MonthInputType::isValidFormat(bool hasYear, bool hasMonth, bool hasWeek, bool hasDay, bool hasAMPM, bool hasHour, bool hasMinute, bool hasSecond) const
{
    return hasYear && hasMonth;
}
#endif
} // namespace WebCore