/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 2000 Simon Hausmann <hausmann@kde.org>
 *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
 * Copyright (C) 2004, 2005, 2006, 2008, 2009, 2010 Apple Inc. All rights reserved.
 *
 * 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"
#include "core/rendering/RenderEmbeddedObject.h"

#include "CSSValueKeywords.h"
#include "HTMLNames.h"
#include "core/html/HTMLIFrameElement.h"
#include "core/page/Frame.h"
#include "core/page/Page.h"
#include "core/page/Settings.h"
#include "core/platform/LocalizedStrings.h"
#include "core/platform/graphics/Font.h"
#include "core/platform/graphics/FontSelector.h"
#include "core/platform/graphics/GraphicsContextStateSaver.h"
#include "core/platform/graphics/Path.h"
#include "core/platform/graphics/TextRun.h"
#include "core/plugins/PluginView.h"
#include "core/rendering/PaintInfo.h"
#include "core/rendering/RenderTheme.h"
#include "core/rendering/RenderView.h"

namespace WebCore {

using namespace HTMLNames;

static const float replacementTextRoundedRectHeight = 18;
static const float replacementTextRoundedRectLeftRightTextMargin = 6;
static const float replacementTextRoundedRectOpacity = 0.20f;
static const float replacementTextRoundedRectRadius = 5;
static const float replacementTextTextOpacity = 0.55f;

static const Color& replacementTextRoundedRectPressedColor()
{
    static const Color lightGray(205, 205, 205);
    return lightGray;
}

RenderEmbeddedObject::RenderEmbeddedObject(Element* element)
    : RenderPart(element)
    , m_hasFallbackContent(false)
    , m_showsUnavailablePluginIndicator(false)
{
    view()->frameView()->setIsVisuallyNonEmpty();
}

RenderEmbeddedObject::~RenderEmbeddedObject()
{
    if (frameView())
        frameView()->removeWidgetToUpdate(this);
}

bool RenderEmbeddedObject::requiresLayer() const
{
    if (RenderPart::requiresLayer())
        return true;

    return allowsAcceleratedCompositing();
}

bool RenderEmbeddedObject::allowsAcceleratedCompositing() const
{
    return widget() && widget()->isPluginView() && toPluginView(widget())->platformLayer();
}

static String unavailablePluginReplacementText(RenderEmbeddedObject::PluginUnavailabilityReason pluginUnavailabilityReason)
{
    switch (pluginUnavailabilityReason) {
    case RenderEmbeddedObject::PluginMissing:
        return missingPluginText();
    case RenderEmbeddedObject::PluginBlockedByContentSecurityPolicy:
        return blockedPluginByContentSecurityPolicyText();
    }

    ASSERT_NOT_REACHED();
    return String();
}

void RenderEmbeddedObject::setPluginUnavailabilityReason(PluginUnavailabilityReason pluginUnavailabilityReason)
{
    ASSERT(!m_showsUnavailablePluginIndicator);
    m_showsUnavailablePluginIndicator = true;
    m_pluginUnavailabilityReason = pluginUnavailabilityReason;

    m_unavailablePluginReplacementText = unavailablePluginReplacementText(pluginUnavailabilityReason);
}

bool RenderEmbeddedObject::showsUnavailablePluginIndicator() const
{
    return m_showsUnavailablePluginIndicator;
}

void RenderEmbeddedObject::paintContents(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    Element* element = toElement(node());
    if (!element || !element->isPluginElement())
        return;

    RenderPart::paintContents(paintInfo, paintOffset);
}

void RenderEmbeddedObject::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    Page* page = 0;
    if (Frame* frame = this->frame())
        page = frame->page();

    if (showsUnavailablePluginIndicator()) {
        if (page && paintInfo.phase == PaintPhaseForeground)
            page->addRelevantUnpaintedObject(this, visualOverflowRect());
        RenderReplaced::paint(paintInfo, paintOffset);
        return;
    }

    if (page && paintInfo.phase == PaintPhaseForeground)
        page->addRelevantRepaintedObject(this, visualOverflowRect());

    RenderPart::paint(paintInfo, paintOffset);
}

void RenderEmbeddedObject::paintReplaced(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    if (!showsUnavailablePluginIndicator())
        return;

    if (paintInfo.phase == PaintPhaseSelection)
        return;

    GraphicsContext* context = paintInfo.context;
    if (context->paintingDisabled())
        return;

    FloatRect contentRect;
    Path path;
    FloatRect replacementTextRect;
    Font font;
    TextRun run("");
    float textWidth;
    if (!getReplacementTextGeometry(paintOffset, contentRect, path, replacementTextRect, font, run, textWidth))
        return;

    GraphicsContextStateSaver stateSaver(*context);
    context->clip(contentRect);
    context->setAlpha(replacementTextRoundedRectOpacity);
    context->setFillColor(Color::white);
    context->fillPath(path);

    const FontMetrics& fontMetrics = font.fontMetrics();
    float labelX = roundf(replacementTextRect.location().x() + (replacementTextRect.size().width() - textWidth) / 2);
    float labelY = roundf(replacementTextRect.location().y() + (replacementTextRect.size().height() - fontMetrics.height()) / 2 + fontMetrics.ascent());
    TextRunPaintInfo runInfo(run);
    runInfo.bounds = replacementTextRect;
    context->setAlpha(replacementTextTextOpacity);
    context->setFillColor(Color::black);
    context->drawBidiText(font, runInfo, FloatPoint(labelX, labelY));
}

bool RenderEmbeddedObject::getReplacementTextGeometry(const LayoutPoint& accumulatedOffset, FloatRect& contentRect, Path& path, FloatRect& replacementTextRect, Font& font, TextRun& run, float& textWidth) const
{
    contentRect = contentBoxRect();
    contentRect.moveBy(roundedIntPoint(accumulatedOffset));

    FontDescription fontDescription;
    RenderTheme::defaultTheme()->systemFont(CSSValueWebkitSmallControl, fontDescription);
    fontDescription.setWeight(FontWeightBold);
    Settings* settings = document()->settings();
    ASSERT(settings);
    if (!settings)
        return false;
    fontDescription.setComputedSize(fontDescription.specifiedSize());
    font = Font(fontDescription, 0, 0);
    font.update(0);

    run = TextRun(m_unavailablePluginReplacementText);
    textWidth = font.width(run);

    replacementTextRect.setSize(FloatSize(textWidth + replacementTextRoundedRectLeftRightTextMargin * 2, replacementTextRoundedRectHeight));
    float x = (contentRect.size().width() / 2 - replacementTextRect.size().width() / 2) + contentRect.location().x();
    float y = (contentRect.size().height() / 2 - replacementTextRect.size().height() / 2) + contentRect.location().y();
    replacementTextRect.setLocation(FloatPoint(x, y));

    path.addRoundedRect(replacementTextRect, FloatSize(replacementTextRoundedRectRadius, replacementTextRoundedRectRadius));

    return true;
}

void RenderEmbeddedObject::layout()
{
    StackStats::LayoutCheckPoint layoutCheckPoint;
    ASSERT(needsLayout());

    LayoutSize oldSize = contentBoxRect().size();

    updateLogicalWidth();
    updateLogicalHeight();

    RenderPart::layout();

    m_overflow.clear();
    addVisualEffectOverflow();

    updateLayerTransform();

    if (!widget() && frameView())
        frameView()->addWidgetToUpdate(this);

    clearNeedsLayout();

    if (!canHaveChildren())
        return;

    // This code copied from RenderMedia::layout().
    RenderObject* child = m_children.firstChild();

    if (!child)
        return;

    RenderBox* childBox = toRenderBox(child);

    if (!childBox)
        return;

    LayoutSize newSize = contentBoxRect().size();
    if (newSize == oldSize && !childBox->needsLayout())
        return;

    // When calling layout() on a child node, a parent must either push a LayoutStateMaintainter, or
    // instantiate LayoutStateDisabler. Since using a LayoutStateMaintainer is slightly more efficient,
    // and this method will be called many times per second during playback, use a LayoutStateMaintainer:
    LayoutStateMaintainer statePusher(view(), this, locationOffset(), hasTransform() || hasReflection() || style()->isFlippedBlocksWritingMode());

    childBox->setLocation(LayoutPoint(borderLeft(), borderTop()) + LayoutSize(paddingLeft(), paddingTop()));
    childBox->style()->setHeight(Length(newSize.height(), Fixed));
    childBox->style()->setWidth(Length(newSize.width(), Fixed));
    childBox->forceLayout();
    clearNeedsLayout();

    statePusher.pop();
}

void RenderEmbeddedObject::viewCleared()
{
    // This is required for <object> elements whose contents are rendered by WebCore (e.g. src="foo.html").
    if (node() && widget() && widget()->isFrameView()) {
        FrameView* view = toFrameView(widget());
        int marginWidth = -1;
        int marginHeight = -1;
        if (node()->hasTagName(iframeTag)) {
            HTMLIFrameElement* frame = toHTMLIFrameElement(node());
            marginWidth = frame->marginWidth();
            marginHeight = frame->marginHeight();
        }
        if (marginWidth != -1)
            view->setMarginWidth(marginWidth);
        if (marginHeight != -1)
            view->setMarginHeight(marginHeight);
    }
}

bool RenderEmbeddedObject::scroll(ScrollDirection direction, ScrollGranularity granularity, float, Node**)
{
    return false;
}

bool RenderEmbeddedObject::logicalScroll(ScrollLogicalDirection direction, ScrollGranularity granularity, float multiplier, Node** stopNode)
{
    return false;
}

bool RenderEmbeddedObject::canHaveChildren() const
{
    return false;
}

}