/*

 * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Library General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Library General Public License for more details.

 *

 * You should have received a copy of the GNU Library General Public License

 * along with this library; see the file COPYING.LIB.  If not, write to

 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

 * Boston, MA 02110-1301, USA.

 *

 */

#include "config.h"

#if ENABLE(METER_TAG)

#include "HTMLMeterElement.h"

#include "Attribute.h"

#include "EventNames.h"

#include "ExceptionCode.h"

#include "FormDataList.h"

#include "HTMLFormElement.h"

#include "HTMLNames.h"

#include "LegacyHTMLTreeBuilder.h"

#include "RenderMeter.h"

#include <wtf/StdLibExtras.h>

namespace WebCore {

using namespace HTMLNames;

// FIXME: This constructor should take an explicit form element pointer passed from the

// parser like the constructors for all the other classes derived from HTMLFormControlElement.

HTMLMeterElement::HTMLMeterElement(const QualifiedName& tagName, Document* document)

    : HTMLFormControlElement(tagName, document, 0)

{

    ASSERT(hasTagName(meterTag));

}

PassRefPtr<HTMLMeterElement> HTMLMeterElement::create(const QualifiedName& tagName, Document* document)

{

    return adoptRef(new HTMLMeterElement(tagName, document));

}

RenderObject* HTMLMeterElement::createRenderer(RenderArena* arena, RenderStyle*)

{

    return new (arena) RenderMeter(this);

}

const AtomicString& HTMLMeterElement::formControlType() const

{

    DEFINE_STATIC_LOCAL(const AtomicString, meter, ("meter"));

    return meter;

}

void HTMLMeterElement::parseMappedAttribute(Attribute* attribute)

{

    if (attribute->name() == valueAttr || attribute->name() == minAttr || attribute->name() == maxAttr || attribute->name() == lowAttr || attribute->name() == highAttr || attribute->name() == optimumAttr) {

        if (renderer())

            renderer()->updateFromElement();

    } else

        HTMLFormControlElement::parseMappedAttribute(attribute);

}

double HTMLMeterElement::min() const

{

    double min = 0;

    parseToDoubleForNumberType(getAttribute(minAttr), &min);

    return min;

}

void HTMLMeterElement::setMin(double min, ExceptionCode& ec)

{

    if (!isfinite(min)) {

        ec = NOT_SUPPORTED_ERR;

        return;

    }

    setAttribute(minAttr, String::number(min));

}

double HTMLMeterElement::max() const

{

    double max = std::max(1.0, min());

    parseToDoubleForNumberType(getAttribute(maxAttr), &max);

    return std::max(max, min());

}

void HTMLMeterElement::setMax(double max, ExceptionCode& ec)

{

    if (!isfinite(max)) {

        ec = NOT_SUPPORTED_ERR;

        return;

    }

    setAttribute(maxAttr, String::number(max));

}

double HTMLMeterElement::value() const

{

    double value = 0;

    parseToDoubleForNumberType(getAttribute(valueAttr), &value);

    return std::min(std::max(value, min()), max());

}

void HTMLMeterElement::setValue(double value, ExceptionCode& ec)

{

    if (!isfinite(value)) {

        ec = NOT_SUPPORTED_ERR;

        return;

    }

    setAttribute(valueAttr, String::number(value));

}

double HTMLMeterElement::low() const

{

    double low = min();

    parseToDoubleForNumberType(getAttribute(lowAttr), &low);

    return std::min(std::max(low, min()), max());

}

void HTMLMeterElement::setLow(double low, ExceptionCode& ec)

{

    if (!isfinite(low)) {

        ec = NOT_SUPPORTED_ERR;

        return;

    }

    setAttribute(lowAttr, String::number(low));

}

double HTMLMeterElement::high() const

{

    double high = max();

    parseToDoubleForNumberType(getAttribute(highAttr), &high);

    return std::min(std::max(high, low()), max());

}

void HTMLMeterElement::setHigh(double high, ExceptionCode& ec)

{

    if (!isfinite(high)) {

        ec = NOT_SUPPORTED_ERR;

        return;

    }

    setAttribute(highAttr, String::number(high));

}

double HTMLMeterElement::optimum() const

{

    double optimum = (max() + min()) / 2;

    parseToDoubleForNumberType(getAttribute(optimumAttr), &optimum);

    return std::min(std::max(optimum, min()), max());

}

void HTMLMeterElement::setOptimum(double optimum, ExceptionCode& ec)

{

    if (!isfinite(optimum)) {

        ec = NOT_SUPPORTED_ERR;

        return;

    }

    setAttribute(optimumAttr, String::number(optimum));

}

HTMLMeterElement::GaugeRegion HTMLMeterElement::gaugeRegion() const

{

    double lowValue = low();

    double highValue = high();

    double theValue = value();

    double optimumValue = optimum();

    if (optimumValue <= lowValue) {

        // The optimum range stays under low

        if (theValue <= lowValue)

            return GaugeRegionOptimum;

        if (theValue <= highValue)

            return GaugeRegionSuboptimal;

        return GaugeRegionEvenLessGood;

    }

    if (highValue <= optimumValue) {

        // The optimum range stays over high

        if (highValue <= theValue)

            return GaugeRegionOptimum;

        if (lowValue <= theValue)

            return GaugeRegionSuboptimal;

        return GaugeRegionEvenLessGood;

    }

    // The optimum range stays between high and low

    if (lowValue < theValue && theValue < highValue)

        return GaugeRegionOptimum;

    if (theValue == min() || max() == theValue)

        return GaugeRegionEvenLessGood;

    return GaugeRegionSuboptimal;

}

} // namespace

#endif