/*
 * 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,
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 * 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 "ValidationMessage.h"

#include "CSSPropertyNames.h"
#include "CSSStyleSelector.h"
#include "CSSValueKeywords.h"
#include "ExceptionCodePlaceholder.h"
#include "FormAssociatedElement.h"
#include "HTMLBRElement.h"
#include "HTMLDivElement.h"
#include "HTMLNames.h"
#include "Page.h"
#include "RenderBlock.h"
#include "RenderObject.h"
#include "Settings.h"
#include "ShadowRoot.h"
#include "ShadowTree.h"
#include "Text.h"
#include <wtf/PassOwnPtr.h>

namespace WebCore {

using namespace HTMLNames;

ALWAYS_INLINE ValidationMessage::ValidationMessage(FormAssociatedElement* element)
    : m_element(element)
{
}

ValidationMessage::~ValidationMessage()
{
    deleteBubbleTree();
}

PassOwnPtr<ValidationMessage> ValidationMessage::create(FormAssociatedElement* element)
{
    return adoptPtr(new ValidationMessage(element));
}

void ValidationMessage::setMessage(const String& message)
{
    // Don't modify the DOM tree in this context.
    // If so, an assertion in Node::isFocusable() fails.
    ASSERT(!message.isEmpty());
    m_message = message;
    if (!m_bubble)
        m_timer = adoptPtr(new Timer<ValidationMessage>(this, &ValidationMessage::buildBubbleTree));
    else
        m_timer = adoptPtr(new Timer<ValidationMessage>(this, &ValidationMessage::setMessageDOMAndStartTimer));
    m_timer->startOneShot(0);
}

void ValidationMessage::setMessageDOMAndStartTimer(Timer<ValidationMessage>*)
{
    ASSERT(m_messageHeading);
    ASSERT(m_messageBody);
    m_messageHeading->removeAllChildren();
    m_messageBody->removeAllChildren();
    Vector<String> lines;
    m_message.split('\n', lines);
    Document* doc = m_messageHeading->document();
    for (unsigned i = 0; i < lines.size(); ++i) {
        if (i) {
            m_messageBody->appendChild(Text::create(doc, lines[i]), ASSERT_NO_EXCEPTION);
            if (i < lines.size() - 1)
                m_messageBody->appendChild(HTMLBRElement::create(doc), ASSERT_NO_EXCEPTION);
        } else
            m_messageHeading->setInnerText(lines[i], ASSERT_NO_EXCEPTION);
    }

    int magnification = doc->page() ? doc->page()->settings()->validationMessageTimerMaginification() : -1;
    if (magnification <= 0)
        m_timer.clear();
    else {
        m_timer = adoptPtr(new Timer<ValidationMessage>(this, &ValidationMessage::deleteBubbleTree));
        m_timer->startOneShot(max(5.0, static_cast<double>(m_message.length()) * magnification / 1000));
    }
}

static void adjustBubblePosition(const LayoutRect& hostRect, HTMLElement* bubble)
{
    ASSERT(bubble);
    if (hostRect.isEmpty())
        return;
    double hostX = hostRect.x();
    double hostY = hostRect.y();
    if (RenderBox* container = bubble->renderer()->containingBlock()) {
        FloatPoint containerLocation = container->localToAbsolute();
        hostX -= containerLocation.x() + container->borderLeft();
        hostY -= containerLocation.y() + container->borderTop();
    }

    bubble->setInlineStyleProperty(CSSPropertyTop, hostY + hostRect.height(), CSSPrimitiveValue::CSS_PX);
    // The 'left' value of ::-webkit-validation-bubble-arrow.
    const int bubbleArrowTopOffset = 32;
    double bubbleX = hostX;
    if (hostRect.width() / 2 < bubbleArrowTopOffset)
        bubbleX = max(hostX + hostRect.width() / 2 - bubbleArrowTopOffset, 0.0);
    bubble->setInlineStyleProperty(CSSPropertyLeft, bubbleX, CSSPrimitiveValue::CSS_PX);
}

void ValidationMessage::buildBubbleTree(Timer<ValidationMessage>*)
{
    HTMLElement* host = toHTMLElement(m_element);
    Document* doc = host->document();
    m_bubble = HTMLDivElement::create(doc);
    m_bubble->setShadowPseudoId("-webkit-validation-bubble");
    // Need to force position:absolute because RenderMenuList doesn't assume it
    // contains non-absolute or non-fixed renderers as children.
    m_bubble->setInlineStyleProperty(CSSPropertyPosition, CSSValueAbsolute);
    ExceptionCode ec = 0;
    host->ensureShadowRoot()->appendChild(m_bubble.get(), ec);
    ASSERT(!ec);
    adjustBubblePosition(host->getRect(), m_bubble.get());

    RefPtr<HTMLDivElement> clipper = HTMLDivElement::create(doc);
    clipper->setShadowPseudoId("-webkit-validation-bubble-arrow-clipper");
    RefPtr<HTMLDivElement> bubbleArrow = HTMLDivElement::create(doc);
    bubbleArrow->setShadowPseudoId("-webkit-validation-bubble-arrow");
    clipper->appendChild(bubbleArrow.release(), ec);
    ASSERT(!ec);
    m_bubble->appendChild(clipper.release(), ec);
    ASSERT(!ec);

    RefPtr<HTMLElement> message = HTMLDivElement::create(doc);
    message->setShadowPseudoId("-webkit-validation-bubble-message");
    RefPtr<HTMLElement> icon = HTMLDivElement::create(doc);
    icon->setShadowPseudoId("-webkit-validation-bubble-icon");
    message->appendChild(icon.release(), ASSERT_NO_EXCEPTION);
    RefPtr<HTMLElement> textBlock = HTMLDivElement::create(doc);
    textBlock->setShadowPseudoId("-webkit-validation-bubble-text-block");
    m_messageHeading = HTMLDivElement::create(doc);
    m_messageHeading->setShadowPseudoId("-webkit-validation-bubble-heading");
    textBlock->appendChild(m_messageHeading, ASSERT_NO_EXCEPTION);
    m_messageBody = HTMLDivElement::create(doc);
    m_messageBody->setShadowPseudoId("-webkit-validation-bubble-body");
    textBlock->appendChild(m_messageBody, ASSERT_NO_EXCEPTION);
    message->appendChild(textBlock.release(), ASSERT_NO_EXCEPTION);
    m_bubble->appendChild(message.release(), ASSERT_NO_EXCEPTION);

    setMessageDOMAndStartTimer();

    // FIXME: Use transition to show the bubble.
}

void ValidationMessage::requestToHideMessage()
{
    // We must not modify the DOM tree in this context by the same reason as setMessage().
    m_timer = adoptPtr(new Timer<ValidationMessage>(this, &ValidationMessage::deleteBubbleTree));
    m_timer->startOneShot(0);
}

void ValidationMessage::deleteBubbleTree(Timer<ValidationMessage>*)
{
    if (m_bubble) {
        m_messageHeading = 0;
        m_messageBody = 0;
        HTMLElement* host = toHTMLElement(m_element);
        ExceptionCode ec;
        host->shadowTree()->oldestShadowRoot()->removeChild(m_bubble.get(), ec);
        m_bubble = 0;
    }
    m_message = String();
}

} // namespace WebCore