/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * 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,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "ColorInputType.h"

#include "CSSPropertyNames.h"
#include "Chrome.h"
#include "Color.h"
#include "HTMLDivElement.h"
#include "HTMLInputElement.h"
#include "MouseEvent.h"
#include "ScriptController.h"
#include "ShadowRoot.h"
#include "ShadowTree.h"

#include <wtf/PassOwnPtr.h>
#include <wtf/text/WTFString.h>

#if ENABLE(INPUT_TYPE_COLOR)

namespace WebCore {

static bool isValidColorString(const String& value)
{
    if (value.isEmpty())
        return false;
    if (value[0] != '#')
        return false;

    // We don't accept #rgb and #aarrggbb formats.
    if (value.length() != 7)
        return false;
    Color color(value);
    return color.isValid() && !color.hasAlpha();
}

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

ColorInputType::~ColorInputType()
{
    endColorChooser();
}

bool ColorInputType::isColorControl() const
{
    return true;
}

const AtomicString& ColorInputType::formControlType() const
{
    return InputTypeNames::color();
}

bool ColorInputType::supportsRequired() const
{
    return false;
}

String ColorInputType::fallbackValue() const
{
    return String("#000000");
}

String ColorInputType::sanitizeValue(const String& proposedValue) const
{
    if (!isValidColorString(proposedValue))
        return fallbackValue();

    return proposedValue.lower();
}

Color ColorInputType::valueAsColor() const
{
    return Color(element()->value());
}

void ColorInputType::createShadowSubtree()
{
    ASSERT(element()->hasShadowRoot());

    Document* document = element()->document();
    RefPtr<HTMLDivElement> wrapperElement = HTMLDivElement::create(document);
    wrapperElement->setShadowPseudoId("-webkit-color-swatch-wrapper");
    RefPtr<HTMLDivElement> colorSwatch = HTMLDivElement::create(document);
    colorSwatch->setShadowPseudoId("-webkit-color-swatch");
    ExceptionCode ec = 0;
    wrapperElement->appendChild(colorSwatch.release(), ec);
    ASSERT(!ec);
    element()->shadowTree()->oldestShadowRoot()->appendChild(wrapperElement.release(), ec);
    ASSERT(!ec);
    
    updateColorSwatch();
}

void ColorInputType::setValue(const String& value, bool valueChanged, TextFieldEventBehavior eventBehavior)
{
    InputType::setValue(value, valueChanged, eventBehavior);

    if (!valueChanged)
        return;

    updateColorSwatch();
    if (m_chooser)
        m_chooser->setSelectedColor(valueAsColor());
}

void ColorInputType::handleDOMActivateEvent(Event* event)
{
    if (element()->disabled() || element()->readOnly() || !element()->renderer())
        return;

    if (!ScriptController::processingUserGesture())
        return;

    Chrome* chrome = this->chrome();
    if (chrome && !m_chooser)
        m_chooser = chrome->createColorChooser(this, valueAsColor());

    event->setDefaultHandled();
}

void ColorInputType::detach()
{
    endColorChooser();
}

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

void ColorInputType::didChooseColor(const Color& color)
{
    if (element()->disabled() || element()->readOnly() || color == valueAsColor())
        return;
    element()->setValueFromRenderer(color.serialized());
    updateColorSwatch();
    element()->dispatchFormControlChangeEvent();
}

void ColorInputType::didEndChooser()
{
    m_chooser.clear();
}

void ColorInputType::endColorChooser()
{
    if (m_chooser)
        m_chooser->endChooser();
}

void ColorInputType::updateColorSwatch()
{
    HTMLElement* colorSwatch = shadowColorSwatch();
    if (!colorSwatch)
        return;

    colorSwatch->setInlineStyleProperty(CSSPropertyBackgroundColor, element()->value(), false);
}

HTMLElement* ColorInputType::shadowColorSwatch() const
{
    ShadowRoot* shadow = element()->shadowTree()->oldestShadowRoot();
    return shadow ? toHTMLElement(shadow->firstChild()->firstChild()) : 0;
}

} // namespace WebCore

#endif // ENABLE(INPUT_TYPE_COLOR)