/*
 * Copyright (C) 2011 Apple 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:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 "WebFullScreenManager.h"

#if ENABLE(FULLSCREEN_API)

#include "Connection.h"
#include "WebCoreArgumentCoders.h"
#include "WebFrame.h"
#include "WebFullScreenManagerProxyMessages.h"
#include "WebPage.h"
#include <WebCore/Color.h>
#include <WebCore/Element.h>
#include <WebCore/FrameView.h>
#include <WebCore/MainFrame.h>
#include <WebCore/Page.h>
#include <WebCore/RenderLayer.h>
#include <WebCore/RenderLayerBacking.h>
#include <WebCore/RenderObject.h>
#include <WebCore/RenderView.h>
#include <WebCore/Settings.h>

using namespace WebCore;

namespace WebKit {

static IntRect screenRectOfContents(Element* element)
{
    ASSERT(element);
    if (element->renderer() && element->renderer()->hasLayer() && element->renderer()->enclosingLayer()->isComposited()) {
        FloatQuad contentsBox = static_cast<FloatRect>(element->renderer()->enclosingLayer()->backing()->contentsBox());
        contentsBox = element->renderer()->localToAbsoluteQuad(contentsBox);
        return element->renderer()->view().frameView().contentsToScreen(contentsBox.enclosingBoundingBox());
    }

    return element->screenRect();
}

Ref<WebFullScreenManager> WebFullScreenManager::create(WebPage* page)
{
    return adoptRef(*new WebFullScreenManager(page));
}

WebFullScreenManager::WebFullScreenManager(WebPage* page)
    : m_topContentInset(0)
    , m_page(page)
{
}
    
WebFullScreenManager::~WebFullScreenManager()
{
}

WebCore::Element* WebFullScreenManager::element() 
{ 
    return m_element.get(); 
}

void WebFullScreenManager::didReceiveMessage(IPC::Connection& connection, IPC::MessageDecoder& decoder)
{
    didReceiveWebFullScreenManagerMessage(connection, decoder);
}

bool WebFullScreenManager::supportsFullScreen(bool withKeyboard)
{
    if (!m_page->corePage()->settings().fullScreenEnabled())
        return false;

    return m_page->injectedBundleFullScreenClient().supportsFullScreen(m_page.get(), withKeyboard);
}

void WebFullScreenManager::enterFullScreenForElement(WebCore::Element* element)
{
    ASSERT(element);
    m_element = element;
    m_initialFrame = screenRectOfContents(m_element.get());
    m_page->injectedBundleFullScreenClient().enterFullScreenForElement(m_page.get(), element);
}

void WebFullScreenManager::exitFullScreenForElement(WebCore::Element* element)
{
    m_page->injectedBundleFullScreenClient().exitFullScreenForElement(m_page.get(), element);
}

void WebFullScreenManager::willEnterFullScreen()
{
    ASSERT(m_element);
    m_element->document().webkitWillEnterFullScreenForElement(m_element.get());
    m_page->hidePageBanners();
    m_element->document().updateLayout();
    m_page->forceRepaintWithoutCallback();
    m_finalFrame = screenRectOfContents(m_element.get());
    m_page->injectedBundleFullScreenClient().beganEnterFullScreen(m_page.get(), m_initialFrame, m_finalFrame);
}

void WebFullScreenManager::didEnterFullScreen()
{
    ASSERT(m_element);
    m_element->document().webkitDidEnterFullScreenForElement(m_element.get());
}

void WebFullScreenManager::willExitFullScreen()
{
    ASSERT(m_element);
    m_finalFrame = screenRectOfContents(m_element.get());
    m_element->document().webkitWillExitFullScreenForElement(m_element.get());
    m_page->showPageBanners();
    m_page->injectedBundleFullScreenClient().beganExitFullScreen(m_page.get(), m_finalFrame, m_initialFrame);
}

void WebFullScreenManager::didExitFullScreen()
{
    ASSERT(m_element);
    m_element->document().webkitDidExitFullScreenForElement(m_element.get());
}

void WebFullScreenManager::setAnimatingFullScreen(bool animating)
{
    ASSERT(m_element);
    m_element->document().setAnimatingFullScreen(animating);
}

void WebFullScreenManager::requestExitFullScreen()
{
    ASSERT(m_element);
    m_element->document().webkitCancelFullScreen();
}

void WebFullScreenManager::close()
{
    m_page->injectedBundleFullScreenClient().closeFullScreen(m_page.get());
}

void WebFullScreenManager::saveScrollPosition()
{
    m_scrollPosition = m_page->corePage()->mainFrame().view()->scrollPosition();
    m_topContentInset = m_page->corePage()->topContentInset();
    m_page->corePage()->setTopContentInset(0);
}

void WebFullScreenManager::restoreScrollPosition()
{
    m_page->corePage()->setTopContentInset(m_topContentInset);
    m_page->corePage()->mainFrame().view()->setScrollPosition(m_scrollPosition);
}

} // namespace WebKit

#endif // ENABLE(FULLSCREEN_API)
