/*
 * 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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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "core/html/SearchInputType.h"

#include "HTMLNames.h"
#include "core/dom/KeyboardEvent.h"
#include "core/html/HTMLInputElement.h"
#include "core/html/InputTypeNames.h"
#include "core/html/shadow/TextControlInnerElements.h"
#include "core/rendering/RenderSearchField.h"
#include "wtf/PassOwnPtr.h"

namespace WebCore {

using namespace HTMLNames;

inline SearchInputType::SearchInputType(HTMLInputElement* element)
    : BaseTextInputType(element)
    , m_searchDecoration(0)
    , m_cancelButton(0)
    , m_searchEventTimer(this, &SearchInputType::searchEventTimerFired)
{
}

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

void SearchInputType::attach()
{
    TextFieldInputType::attach();
    observeFeatureIfVisible(UseCounter::InputTypeSearch);
}

RenderObject* SearchInputType::createRenderer(RenderStyle*) const
{
    return new (element()->document()->renderArena()) RenderSearchField(element());
}

const AtomicString& SearchInputType::formControlType() const
{
    return InputTypeNames::search();
}

bool SearchInputType::shouldRespectSpeechAttribute()
{
    return true;
}

bool SearchInputType::isSearchField() const
{
    return true;
}

bool SearchInputType::needsContainer() const
{
    return true;
}

void SearchInputType::createShadowSubtree()
{
    ASSERT(!m_searchDecoration);
    ASSERT(!m_cancelButton);

    TextFieldInputType::createShadowSubtree();
    HTMLElement* container = containerElement();
    HTMLElement* textWrapper = innerBlockElement();
    ASSERT(container);
    ASSERT(textWrapper);

    RefPtr<SearchFieldDecorationElement> searchDecoration = SearchFieldDecorationElement::create(element()->document());
    m_searchDecoration = searchDecoration.get();
    container->insertBefore(m_searchDecoration, textWrapper, IGNORE_EXCEPTION);

    RefPtr<SearchFieldCancelButtonElement> cancelButton = SearchFieldCancelButtonElement::create(element()->document());
    m_cancelButton = cancelButton.get();
    container->insertBefore(m_cancelButton, textWrapper->nextSibling(), IGNORE_EXCEPTION);
}

HTMLElement* SearchInputType::searchDecorationElement() const
{
    return m_searchDecoration;
}

HTMLElement* SearchInputType::cancelButtonElement() const
{
    return m_cancelButton;
}

void SearchInputType::handleKeydownEvent(KeyboardEvent* event)
{
    if (element()->isDisabledOrReadOnly()) {
        TextFieldInputType::handleKeydownEvent(event);
        return;
    }

    const String& key = event->keyIdentifier();
    if (key == "U+001B") {
        RefPtr<HTMLInputElement> input = element();
        input->setValueForUser("");
        input->onSearch();
        event->setDefaultHandled();
        return;
    }
    TextFieldInputType::handleKeydownEvent(event);
}

void SearchInputType::destroyShadowSubtree()
{
    TextFieldInputType::destroyShadowSubtree();
    m_searchDecoration = 0;
    m_cancelButton = 0;
}

void SearchInputType::startSearchEventTimer()
{
    ASSERT(element()->renderer());
    unsigned length = element()->innerTextValue().length();

    if (!length) {
        stopSearchEventTimer();
        element()->onSearch();
        return;
    }

    // After typing the first key, we wait 0.5 seconds.
    // After the second key, 0.4 seconds, then 0.3, then 0.2 from then on.
    m_searchEventTimer.startOneShot(max(0.2, 0.6 - 0.1 * length));
}

void SearchInputType::stopSearchEventTimer()
{
    m_searchEventTimer.stop();
}

void SearchInputType::searchEventTimerFired(Timer<SearchInputType>*)
{
    element()->onSearch();
}

bool SearchInputType::searchEventsShouldBeDispatched() const
{
    return element()->hasAttribute(incrementalAttr);
}

void SearchInputType::didSetValueByUserEdit(ValueChangeState state)
{
    if (m_cancelButton)
        toRenderSearchField(element()->renderer())->updateCancelButtonVisibility();

    // If the incremental attribute is set, then dispatch the search event
    if (searchEventsShouldBeDispatched())
        startSearchEventTimer();

    TextFieldInputType::didSetValueByUserEdit(state);
}

bool SearchInputType::supportsInputModeAttribute() const
{
    return true;
}

} // namespace WebCore