/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 1999 Antti Koivisto (koivisto@kde.org)
 *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
 * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011 Apple Inc. All rights reserved.
 * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
 *
 * 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 "HTMLObjectElement.h"

#include "Attribute.h"
#include "CSSValueKeywords.h"
#include "CachedImage.h"
#include "Chrome.h"
#include "ChromeClient.h"
#include "EventNames.h"
#include "ExceptionCode.h"
#include "FormDataList.h"
#include "Frame.h"
#include "HTMLDocument.h"
#include "HTMLFormElement.h"
#include "HTMLImageLoader.h"
#include "HTMLMetaElement.h"
#include "HTMLNames.h"
#include "HTMLParamElement.h"
#include "HTMLParserIdioms.h"
#include "MIMETypeRegistry.h"
#include "NodeList.h"
#include "NodeTraversal.h"
#include "Page.h"
#include "PluginViewBase.h"
#include "RenderEmbeddedObject.h"
#include "RenderImage.h"
#include "RenderWidget.h"
#include "ScriptEventListener.h"
#include "Settings.h"
#include "Text.h"
#include "Widget.h"

namespace WebCore {

using namespace HTMLNames;

inline HTMLObjectElement::HTMLObjectElement(const QualifiedName& tagName, Document* document, HTMLFormElement* form, bool createdByParser) 
    : HTMLPlugInImageElement(tagName, document, createdByParser, ShouldNotPreferPlugInsForImages)
    , m_docNamedItem(true)
    , m_useFallbackContent(false)
{
    ASSERT(hasTagName(objectTag));
    setForm(form ? form : findFormAncestor());
}

inline HTMLObjectElement::~HTMLObjectElement()
{
}

PassRefPtr<HTMLObjectElement> HTMLObjectElement::create(const QualifiedName& tagName, Document* document, HTMLFormElement* form, bool createdByParser)
{
    return adoptRef(new HTMLObjectElement(tagName, document, form, createdByParser));
}

RenderWidget* HTMLObjectElement::renderWidgetForJSBindings() const
{
    document()->updateLayoutIgnorePendingStylesheets();
    return renderPart(); // This will return 0 if the renderer is not a RenderPart.
}

static bool isQtPluginServiceType(const String& serviceType)
{
    return equalIgnoringCase(serviceType, "application/x-qt-plugin") || equalIgnoringCase(serviceType, "application/x-qt-styled-widget");
}

bool HTMLObjectElement::isPresentationAttribute(const QualifiedName& name) const
{
    if (name == borderAttr)
        return true;
    return HTMLPlugInImageElement::isPresentationAttribute(name);
}

void HTMLObjectElement::collectStyleForPresentationAttribute(const QualifiedName& name, const AtomicString& value, MutableStylePropertySet* style)
{
    if (name == borderAttr)
        applyBorderAttributeToStyle(value, style);
    else
        HTMLPlugInImageElement::collectStyleForPresentationAttribute(name, value, style);
}

void HTMLObjectElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
{
    if (name == formAttr)
        formAttributeChanged();
    else if (name == typeAttr) {
        m_serviceType = value.lower();
        size_t pos = m_serviceType.find(";");
        if (pos != notFound)
            m_serviceType = m_serviceType.left(pos);
        if (renderer())
            setNeedsWidgetUpdate(true);
    } else if (name == dataAttr) {
        m_url = stripLeadingAndTrailingHTMLSpaces(value);
        if (renderer()) {
            setNeedsWidgetUpdate(true);
            if (isImageType()) {
                if (!m_imageLoader)
                    m_imageLoader = adoptPtr(new HTMLImageLoader(this));
                m_imageLoader->updateFromElementIgnoringPreviousError();
            }
        }
    } else if (name == classidAttr) {
        m_classId = value;
        if (renderer())
            setNeedsWidgetUpdate(true);
    } else if (name == onbeforeloadAttr)
        setAttributeEventListener(eventNames().beforeloadEvent, createAttributeEventListener(this, name, value));
    else
        HTMLPlugInImageElement::parseAttribute(name, value);
}

static void mapDataParamToSrc(Vector<String>* paramNames, Vector<String>* paramValues)
{
    // Some plugins don't understand the "data" attribute of the OBJECT tag (i.e. Real and WMP
    // require "src" attribute).
    int srcIndex = -1, dataIndex = -1;
    for (unsigned int i = 0; i < paramNames->size(); ++i) {
        if (equalIgnoringCase((*paramNames)[i], "src"))
            srcIndex = i;
        else if (equalIgnoringCase((*paramNames)[i], "data"))
            dataIndex = i;
    }
    
    if (srcIndex == -1 && dataIndex != -1) {
        paramNames->append("src");
        paramValues->append((*paramValues)[dataIndex]);
    }
}

// FIXME: This function should not deal with url or serviceType!
void HTMLObjectElement::parametersForPlugin(Vector<String>& paramNames, Vector<String>& paramValues, String& url, String& serviceType)
{
    HashSet<StringImpl*, CaseFoldingHash> uniqueParamNames;
    String urlParameter;
    
    // Scan the PARAM children and store their name/value pairs.
    // Get the URL and type from the params if we don't already have them.
    for (Node* child = firstChild(); child; child = child->nextSibling()) {
        if (!child->hasTagName(paramTag))
            continue;

        HTMLParamElement* p = static_cast<HTMLParamElement*>(child);
        String name = p->name();
        if (name.isEmpty())
            continue;

        uniqueParamNames.add(name.impl());
        paramNames.append(p->name());
        paramValues.append(p->value());

        // FIXME: url adjustment does not belong in this function.
        if (url.isEmpty() && urlParameter.isEmpty() && !isQtPluginServiceType(serviceType) && (equalIgnoringCase(name, "src") || equalIgnoringCase(name, "movie") || equalIgnoringCase(name, "code") || equalIgnoringCase(name, "url")))
            urlParameter = stripLeadingAndTrailingHTMLSpaces(p->value());
        // FIXME: serviceType calculation does not belong in this function.
        if (serviceType.isEmpty() && equalIgnoringCase(name, "type")) {
            serviceType = p->value();
            size_t pos = serviceType.find(";");
            if (pos != notFound)
                serviceType = serviceType.left(pos);
        }
    }
    
    // When OBJECT is used for an applet via Sun's Java plugin, the CODEBASE attribute in the tag
    // points to the Java plugin itself (an ActiveX component) while the actual applet CODEBASE is
    // in a PARAM tag. See <http://java.sun.com/products/plugin/1.2/docs/tags.html>. This means
    // we have to explicitly suppress the tag's CODEBASE attribute if there is none in a PARAM,
    // else our Java plugin will misinterpret it. [4004531]
    String codebase;
    if (MIMETypeRegistry::isJavaAppletMIMEType(serviceType)) {
        codebase = "codebase";
        uniqueParamNames.add(codebase.impl()); // pretend we found it in a PARAM already
    }
    
    // Turn the attributes of the <object> element into arrays, but don't override <param> values.
    if (hasAttributes()) {
        for (unsigned i = 0; i < attributeCount(); ++i) {
            const Attribute* attribute = attributeItem(i);
            const AtomicString& name = attribute->name().localName();
            if (!uniqueParamNames.contains(name.impl())) {
                paramNames.append(name.string());
                paramValues.append(attribute->value().string());
            }
        }
    }
    
    mapDataParamToSrc(&paramNames, &paramValues);
    
    // HTML5 says that an object resource's URL is specified by the object's data
    // attribute, not by a param element. However, for compatibility, allow the
    // resource's URL to be given by a param named "src", "movie", "code" or "url"
    // if we know that resource points to a plug-in.
    if (url.isEmpty() && !urlParameter.isEmpty() && !isQtPluginServiceType(serviceType)) {
        SubframeLoader* loader = document()->frame()->loader()->subframeLoader();
        if (loader->resourceWillUsePlugin(urlParameter, serviceType, shouldPreferPlugInsForImages()))
            url = urlParameter;
    }
}

    
bool HTMLObjectElement::hasFallbackContent() const
{
    for (Node* child = firstChild(); child; child = child->nextSibling()) {
        // Ignore whitespace-only text, and <param> tags, any other content is fallback content.
        if (child->isTextNode()) {
            if (!toText(child)->containsOnlyWhitespace())
                return true;
        } else if (!child->hasTagName(paramTag))
            return true;
    }
    return false;
}
    
bool HTMLObjectElement::shouldAllowQuickTimeClassIdQuirk()
{
    // This site-specific hack maintains compatibility with Mac OS X Wiki Server,
    // which embeds QuickTime movies using an object tag containing QuickTime's
    // ActiveX classid. Treat this classid as valid only if OS X Server's unique
    // 'generator' meta tag is present. Only apply this quirk if there is no
    // fallback content, which ensures the quirk will disable itself if Wiki
    // Server is updated to generate an alternate embed tag as fallback content.
    if (!document()->page()
        || !document()->page()->settings()->needsSiteSpecificQuirks()
        || hasFallbackContent()
        || !equalIgnoringCase(classId(), "clsid:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B"))
        return false;

    RefPtr<NodeList> metaElements = document()->getElementsByTagName(HTMLNames::metaTag.localName());
    unsigned length = metaElements->length();
    for (unsigned i = 0; i < length; ++i) {
        ASSERT(metaElements->item(i)->isHTMLElement());
        HTMLMetaElement* metaElement = static_cast<HTMLMetaElement*>(metaElements->item(i));
        if (equalIgnoringCase(metaElement->name(), "generator") && metaElement->content().startsWith("Mac OS X Server Web Services Server", false))
            return true;
    }
    
    return false;
}
    
bool HTMLObjectElement::hasValidClassId()
{
#if PLATFORM(QT)
    if (isQtPluginServiceType(serviceType()))
        return true;
#endif

    if (MIMETypeRegistry::isJavaAppletMIMEType(serviceType()) && classId().startsWith("java:", false))
        return true;
    
    if (shouldAllowQuickTimeClassIdQuirk())
        return true;

    // HTML5 says that fallback content should be rendered if a non-empty
    // classid is specified for which the UA can't find a suitable plug-in.
    return classId().isEmpty();
}

// FIXME: This should be unified with HTMLEmbedElement::updateWidget and
// moved down into HTMLPluginImageElement.cpp
void HTMLObjectElement::updateWidget(PluginCreationOption pluginCreationOption)
{
    ASSERT(!renderEmbeddedObject()->isPluginUnavailable());
    ASSERT(needsWidgetUpdate());
    setNeedsWidgetUpdate(false);
    // FIXME: This should ASSERT isFinishedParsingChildren() instead.
    if (!isFinishedParsingChildren())
        return;

    // FIXME: I'm not sure it's ever possible to get into updateWidget during a
    // removal, but just in case we should avoid loading the frame to prevent
    // security bugs.
    if (!SubframeLoadingDisabler::canLoadFrame(this))
        return;

    String url = this->url();
    String serviceType = this->serviceType();

    // FIXME: These should be joined into a PluginParameters class.
    Vector<String> paramNames;
    Vector<String> paramValues;
    parametersForPlugin(paramNames, paramValues, url, serviceType);

    // Note: url is modified above by parametersForPlugin.
    if (!allowedToLoadFrameURL(url))
        return;

    bool fallbackContent = hasFallbackContent();
    renderEmbeddedObject()->setHasFallbackContent(fallbackContent);

    // FIXME: It's sadness that we have this special case here.
    //        See http://trac.webkit.org/changeset/25128 and
    //        plugins/netscape-plugin-setwindow-size.html
    if (pluginCreationOption == CreateOnlyNonNetscapePlugins && wouldLoadAsNetscapePlugin(url, serviceType)) {
        // Ensure updateWidget() is called again during layout to create the Netscape plug-in.
        setNeedsWidgetUpdate(true);
        return;
    }

    RefPtr<HTMLObjectElement> protect(this); // beforeload and plugin loading can make arbitrary DOM mutations.
    bool beforeLoadAllowedLoad = guardedDispatchBeforeLoadEvent(url);
    if (!renderer()) // Do not load the plugin if beforeload removed this element or its renderer.
        return;

    SubframeLoader* loader = document()->frame()->loader()->subframeLoader();
    bool success = beforeLoadAllowedLoad && hasValidClassId() && loader->requestObject(this, url, getNameAttribute(), serviceType, paramNames, paramValues);
    if (!success && fallbackContent)
        renderFallbackContent();
}

bool HTMLObjectElement::rendererIsNeeded(const NodeRenderingContext& context)
{
    // FIXME: This check should not be needed, detached documents never render!
    Frame* frame = document()->frame();
    if (!frame)
        return false;

    return HTMLPlugInImageElement::rendererIsNeeded(context);
}

Node::InsertionNotificationRequest HTMLObjectElement::insertedInto(ContainerNode* insertionPoint)
{
    HTMLPlugInImageElement::insertedInto(insertionPoint);
    FormAssociatedElement::insertedInto(insertionPoint);
    return InsertionDone;
}

void HTMLObjectElement::removedFrom(ContainerNode* insertionPoint)
{
    HTMLPlugInImageElement::removedFrom(insertionPoint);
    FormAssociatedElement::removedFrom(insertionPoint);
}

void HTMLObjectElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
{
    updateDocNamedItem();
    if (inDocument() && !useFallbackContent()) {
        setNeedsWidgetUpdate(true);
        setNeedsStyleRecalc();
    }
    HTMLPlugInImageElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
}

bool HTMLObjectElement::isURLAttribute(const Attribute& attribute) const
{
    return attribute.name() == dataAttr || (attribute.name() == usemapAttr && attribute.value().string()[0] != '#') || HTMLPlugInImageElement::isURLAttribute(attribute);
}

const AtomicString& HTMLObjectElement::imageSourceURL() const
{
    return getAttribute(dataAttr);
}

void HTMLObjectElement::renderFallbackContent()
{
    if (useFallbackContent())
        return;
    
    if (!inDocument())
        return;

    // Before we give up and use fallback content, check to see if this is a MIME type issue.
    if (m_imageLoader && m_imageLoader->image() && m_imageLoader->image()->status() != CachedResource::LoadError) {
        m_serviceType = m_imageLoader->image()->response().mimeType();
        if (!isImageType()) {
            // If we don't think we have an image type anymore, then clear the image from the loader.
            m_imageLoader->setImage(0);
            reattach();
            return;
        }
    }

    m_useFallbackContent = true;

    // FIXME: Style gets recalculated which is suboptimal.
    detach();
    attach();
}

// FIXME: This should be removed, all callers are almost certainly wrong.
static bool isRecognizedTagName(const QualifiedName& tagName)
{
    DEFINE_STATIC_LOCAL(HashSet<AtomicStringImpl*>, tagList, ());
    if (tagList.isEmpty()) {
        QualifiedName** tags = HTMLNames::getHTMLTags();
        for (size_t i = 0; i < HTMLNames::HTMLTagsCount; i++) {
            if (*tags[i] == bgsoundTag
                || *tags[i] == commandTag
                || *tags[i] == detailsTag
                || *tags[i] == figcaptionTag
                || *tags[i] == figureTag
                || *tags[i] == summaryTag
                || *tags[i] == trackTag) {
                // Even though we have atoms for these tags, we don't want to
                // treat them as "recognized tags" for the purpose of parsing
                // because that changes how we parse documents.
                continue;
            }
            tagList.add(tags[i]->localName().impl());
        }
    }
    return tagList.contains(tagName.localName().impl());
}

void HTMLObjectElement::updateDocNamedItem()
{
    // The rule is "<object> elements with no children other than
    // <param> elements, unknown elements and whitespace can be
    // found by name in a document, and other <object> elements cannot."
    bool wasNamedItem = m_docNamedItem;
    bool isNamedItem = true;
    Node* child = firstChild();
    while (child && isNamedItem) {
        if (child->isElementNode()) {
            Element* element = toElement(child);
            // FIXME: Use of isRecognizedTagName is almost certainly wrong here.
            if (isRecognizedTagName(element->tagQName()) && !element->hasTagName(paramTag))
                isNamedItem = false;
        } else if (child->isTextNode()) {
            if (!toText(child)->containsOnlyWhitespace())
                isNamedItem = false;
        } else
            isNamedItem = false;
        child = child->nextSibling();
    }
    if (isNamedItem != wasNamedItem && inDocument() && document()->isHTMLDocument()) {
        HTMLDocument* document = toHTMLDocument(this->document());

        const AtomicString& id = getIdAttribute();
        if (!id.isEmpty()) {
            if (isNamedItem)
                document->documentNamedItemMap().add(id.impl(), this);
            else
                document->documentNamedItemMap().remove(id.impl(), this);
        }

        const AtomicString& name = getNameAttribute();
        if (!name.isEmpty() && id != name) {
            if (isNamedItem)
                document->documentNamedItemMap().add(name.impl(), this);
            else
                document->documentNamedItemMap().remove(name.impl(), this);
        }
    }
    m_docNamedItem = isNamedItem;
}

bool HTMLObjectElement::containsJavaApplet() const
{
    if (MIMETypeRegistry::isJavaAppletMIMEType(getAttribute(typeAttr)))
        return true;
        
    for (Element* child = ElementTraversal::firstWithin(this); child; child = ElementTraversal::nextSkippingChildren(child, this)) {
        if (child->hasTagName(paramTag)
                && equalIgnoringCase(child->getNameAttribute(), "type")
                && MIMETypeRegistry::isJavaAppletMIMEType(child->getAttribute(valueAttr).string()))
            return true;
        if (child->hasTagName(objectTag)
                && static_cast<HTMLObjectElement*>(child)->containsJavaApplet())
            return true;
        if (child->hasTagName(appletTag))
            return true;
    }
    
    return false;
}

void HTMLObjectElement::addSubresourceAttributeURLs(ListHashSet<KURL>& urls) const
{
    HTMLPlugInImageElement::addSubresourceAttributeURLs(urls);

    addSubresourceURL(urls, document()->completeURL(getAttribute(dataAttr)));

    // FIXME: Passing a string that starts with "#" to the completeURL function does
    // not seem like it would work. The image element has similar but not identical code.
    const AtomicString& useMap = getAttribute(usemapAttr);
    if (useMap.startsWith('#'))
        addSubresourceURL(urls, document()->completeURL(useMap));
}

void HTMLObjectElement::didMoveToNewDocument(Document* oldDocument)
{
    FormAssociatedElement::didMoveToNewDocument(oldDocument);
    HTMLPlugInImageElement::didMoveToNewDocument(oldDocument);
}

bool HTMLObjectElement::appendFormData(FormDataList& encoding, bool)
{
    if (name().isEmpty())
        return false;

    Widget* widget = pluginWidget();
    if (!widget || !widget->isPluginViewBase())
        return false;
    String value;
    if (!toPluginViewBase(widget)->getFormValue(value))
        return false;
    encoding.appendData(name(), value);
    return true;
}

HTMLFormElement* HTMLObjectElement::virtualForm() const
{
    return FormAssociatedElement::form();
}

#if ENABLE(MICRODATA)
String HTMLObjectElement::itemValueText() const
{
    return getURLAttribute(dataAttr);
}

void HTMLObjectElement::setItemValueText(const String& value, ExceptionCode&)
{
    setAttribute(dataAttr, value);
}
#endif

}