/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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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
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 */

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

#include "core/html/HTMLInputElement.h"
#include "core/platform/text/PlatformLocale.h"
#include "wtf/CurrentTime.h"
#include "wtf/DateMath.h"
#include "wtf/MathExtras.h"
#include "wtf/text/WTFString.h"
#include <limits>

namespace WebCore {

using namespace HTMLNames;
using namespace std;

static const int msecPerMinute = 60 * 1000;
static const int msecPerSecond = 1000;

double BaseDateAndTimeInputType::valueAsDate() const
{
    return valueAsDouble();
}

void BaseDateAndTimeInputType::setValueAsDate(double value, ExceptionState&) const
{
    element()->setValue(serializeWithMilliseconds(value));
}

double BaseDateAndTimeInputType::valueAsDouble() const
{
    const Decimal value = parseToNumber(element()->value(), Decimal::nan());
    return value.isFinite() ? value.toDouble() : DateComponents::invalidMilliseconds();
}

void BaseDateAndTimeInputType::setValueAsDecimal(const Decimal& newValue, TextFieldEventBehavior eventBehavior, ExceptionState&) const
{
    element()->setValue(serialize(newValue), eventBehavior);
}

bool BaseDateAndTimeInputType::typeMismatchFor(const String& value) const
{
    return !value.isEmpty() && !parseToDateComponents(value, 0);
}

bool BaseDateAndTimeInputType::typeMismatch() const
{
    return typeMismatchFor(element()->value());
}

Decimal BaseDateAndTimeInputType::defaultValueForStepUp() const
{
    double ms = currentTimeMS();
    double utcOffset = calculateUTCOffset();
    double dstOffset = calculateDSTOffset(ms, utcOffset);
    int offset = static_cast<int>((utcOffset + dstOffset) / msPerMinute);
    return Decimal::fromDouble(ms + (offset * msPerMinute));
}

bool BaseDateAndTimeInputType::isSteppable() const
{
    return true;
}

Decimal BaseDateAndTimeInputType::parseToNumber(const String& source, const Decimal& defaultValue) const
{
    DateComponents date;
    if (!parseToDateComponents(source, &date))
        return defaultValue;
    double msec = date.millisecondsSinceEpoch();
    ASSERT(std::isfinite(msec));
    return Decimal::fromDouble(msec);
}

bool BaseDateAndTimeInputType::parseToDateComponents(const String& source, DateComponents* out) const
{
    if (source.isEmpty())
        return false;
    DateComponents ignoredResult;
    if (!out)
        out = &ignoredResult;
    return parseToDateComponentsInternal(source, out);
}

String BaseDateAndTimeInputType::serialize(const Decimal& value) const
{
    if (!value.isFinite())
        return String();
    DateComponents date;
    if (!setMillisecondToDateComponents(value.toDouble(), &date))
        return String();
    return serializeWithComponents(date);
}

String BaseDateAndTimeInputType::serializeWithComponents(const DateComponents& date) const
{
    Decimal step;
    if (!element()->getAllowedValueStep(&step))
        return date.toString();
    if (step.remainder(msecPerMinute).isZero())
        return date.toString(DateComponents::None);
    if (step.remainder(msecPerSecond).isZero())
        return date.toString(DateComponents::Second);
    return date.toString(DateComponents::Millisecond);
}

String BaseDateAndTimeInputType::serializeWithMilliseconds(double value) const
{
    return serialize(Decimal::fromDouble(value));
}

String BaseDateAndTimeInputType::localizeValue(const String& proposedValue) const
{
    DateComponents date;
    if (!parseToDateComponents(proposedValue, &date))
        return proposedValue;

    String localized = element()->locale().formatDateTime(date);
    return localized.isEmpty() ? proposedValue : localized;
}

String BaseDateAndTimeInputType::visibleValue() const
{
    return localizeValue(element()->value());
}

String BaseDateAndTimeInputType::sanitizeValue(const String& proposedValue) const
{
    return typeMismatchFor(proposedValue) ? emptyString() : proposedValue;
}

bool BaseDateAndTimeInputType::supportsReadOnly() const
{
    return true;
}

bool BaseDateAndTimeInputType::shouldRespectListAttribute()
{
    return InputType::themeSupportsDataListUI(this);
}

bool BaseDateAndTimeInputType::valueMissing(const String& value) const
{
    return element()->isRequired() && value.isEmpty();
}

bool BaseDateAndTimeInputType::shouldShowFocusRingOnMouseFocus() const
{
    return true;
}

} // namespace WebCore
