/*
 * 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, 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 "core/html/HTMLEmbedElement.h"

#include "core/CSSPropertyNames.h"
#include "core/HTMLNames.h"
#include "core/dom/Attribute.h"
#include "core/dom/ElementTraversal.h"
#include "core/dom/shadow/ShadowRoot.h"
#include "core/html/HTMLImageLoader.h"
#include "core/html/HTMLObjectElement.h"
#include "core/html/PluginDocument.h"
#include "core/html/parser/HTMLParserIdioms.h"
#include "core/layout/LayoutPart.h"
#include "core/layout/api/LayoutEmbeddedItem.h"
#include "core/loader/FrameLoaderClient.h"

namespace blink {

using namespace HTMLNames;

inline HTMLEmbedElement::HTMLEmbedElement(Document& document,
                                          bool createdByParser)
    : HTMLPlugInElement(embedTag,
                        document,
                        createdByParser,
                        ShouldPreferPlugInsForImages) {}

HTMLEmbedElement* HTMLEmbedElement::create(Document& document,
                                           bool createdByParser) {
  HTMLEmbedElement* element = new HTMLEmbedElement(document, createdByParser);
  element->ensureUserAgentShadowRoot();
  return element;
}

static inline LayoutPart* findPartLayoutObject(const Node* n) {
  if (!n->layoutObject())
    n = Traversal<HTMLObjectElement>::firstAncestor(*n);

  if (n && n->layoutObject() && n->layoutObject()->isLayoutPart())
    return toLayoutPart(n->layoutObject());

  return nullptr;
}

LayoutPart* HTMLEmbedElement::existingLayoutPart() const {
  return findPartLayoutObject(this);
}

bool HTMLEmbedElement::isPresentationAttribute(
    const QualifiedName& name) const {
  if (name == hiddenAttr)
    return true;
  return HTMLPlugInElement::isPresentationAttribute(name);
}

void HTMLEmbedElement::collectStyleForPresentationAttribute(
    const QualifiedName& name,
    const AtomicString& value,
    MutableStylePropertySet* style) {
  if (name == hiddenAttr) {
    if (equalIgnoringCase(value, "yes") || equalIgnoringCase(value, "true")) {
      addPropertyToPresentationAttributeStyle(
          style, CSSPropertyWidth, 0, CSSPrimitiveValue::UnitType::Pixels);
      addPropertyToPresentationAttributeStyle(
          style, CSSPropertyHeight, 0, CSSPrimitiveValue::UnitType::Pixels);
    }
  } else {
    HTMLPlugInElement::collectStyleForPresentationAttribute(name, value, style);
  }
}

void HTMLEmbedElement::parseAttribute(
    const AttributeModificationParams& params) {
  if (params.name == typeAttr) {
    m_serviceType = params.newValue.lower();
    size_t pos = m_serviceType.find(";");
    if (pos != kNotFound)
      m_serviceType = m_serviceType.left(pos);
    if (layoutObject()) {
      setNeedsWidgetUpdate(true);
      layoutObject()->setNeedsLayoutAndFullPaintInvalidation(
          "Embed type changed");
    } else {
      requestPluginCreationWithoutLayoutObjectIfPossible();
    }
  } else if (params.name == codeAttr) {
    // TODO(schenney): Remove this branch? It's not in the spec and we're not in
    // the HTMLAppletElement hierarchy.
    m_url = stripLeadingAndTrailingHTMLSpaces(params.newValue);
  } else if (params.name == srcAttr) {
    m_url = stripLeadingAndTrailingHTMLSpaces(params.newValue);
    if (layoutObject() && isImageType()) {
      if (!m_imageLoader)
        m_imageLoader = HTMLImageLoader::create(this);
      m_imageLoader->updateFromElement(ImageLoader::UpdateIgnorePreviousError);
    } else if (layoutObject()) {
      // Check if this Embed can transition from potentially-active to active
      if (fastHasAttribute(typeAttr)) {
        setNeedsWidgetUpdate(true);
        lazyReattachIfNeeded();
      }
    } else {
      requestPluginCreationWithoutLayoutObjectIfPossible();
    }
  } else {
    HTMLPlugInElement::parseAttribute(params);
  }
}

void HTMLEmbedElement::parametersForPlugin(Vector<String>& paramNames,
                                           Vector<String>& paramValues) {
  AttributeCollection attributes = this->attributes();
  for (const Attribute& attribute : attributes) {
    paramNames.push_back(attribute.localName().getString());
    paramValues.push_back(attribute.value().getString());
  }
}

// FIXME: This should be unified with HTMLObjectElement::updateWidget and
// moved down into HTMLPluginElement.cpp
void HTMLEmbedElement::updateWidgetInternal() {
  DCHECK(!layoutEmbeddedItem().showsUnavailablePluginIndicator());
  DCHECK(needsWidgetUpdate());
  setNeedsWidgetUpdate(false);

  if (m_url.isEmpty() && m_serviceType.isEmpty())
    return;

  // Note these pass m_url and m_serviceType to allow better code sharing with
  // <object> which modifies url and serviceType before calling these.
  if (!allowedToLoadFrameURL(m_url))
    return;

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

  // FIXME: Can we not have layoutObject here now that beforeload events are
  // gone?
  if (!layoutObject())
    return;

  // Overwrites the URL and MIME type of a Flash embed to use an HTML5 embed.
  KURL overridenUrl =
      document().frame()->loader().client()->overrideFlashEmbedWithHTML(
          document().completeURL(m_url));
  if (!overridenUrl.isEmpty()) {
    m_url = overridenUrl.getString();
    m_serviceType = "text/html";
  }

  requestObject(m_url, m_serviceType, paramNames, paramValues);
}

bool HTMLEmbedElement::layoutObjectIsNeeded(const ComputedStyle& style) {
  if (isImageType())
    return HTMLPlugInElement::layoutObjectIsNeeded(style);

  // https://html.spec.whatwg.org/multipage/embedded-content.html#the-embed-element
  // While any of the following conditions are occurring, any plugin
  // instantiated for the element must be removed, and the embed element
  // represents nothing:

  // * The element has neither a src attribute nor a type attribute.
  if (!fastHasAttribute(srcAttr) && !fastHasAttribute(typeAttr))
    return false;

  // * The element has a media element ancestor.
  // -> It's realized by LayoutMedia::isChildAllowed.

  // * The element has an ancestor object element that is not showing its
  //   fallback content.
  ContainerNode* p = parentNode();
  if (isHTMLObjectElement(p)) {
    DCHECK(p->layoutObject());
    if (!toHTMLObjectElement(p)->willUseFallbackContentAtLayout() &&
        !toHTMLObjectElement(p)->useFallbackContent()) {
      DCHECK(!p->layoutObject()->isEmbeddedObject());
      return false;
    }
  }
  return HTMLPlugInElement::layoutObjectIsNeeded(style);
}

bool HTMLEmbedElement::isURLAttribute(const Attribute& attribute) const {
  return attribute.name() == srcAttr ||
         HTMLPlugInElement::isURLAttribute(attribute);
}

const QualifiedName& HTMLEmbedElement::subResourceAttributeName() const {
  return srcAttr;
}

bool HTMLEmbedElement::isInteractiveContent() const {
  return true;
}

bool HTMLEmbedElement::isExposed() const {
  // http://www.whatwg.org/specs/web-apps/current-work/#exposed
  for (HTMLObjectElement* object =
           Traversal<HTMLObjectElement>::firstAncestor(*this);
       object; object = Traversal<HTMLObjectElement>::firstAncestor(*object)) {
    if (object->isExposed())
      return false;
  }
  return true;
}

}  // namespace blink