/*
 * Copyright (C) 2006, 2008 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 COMPUTER, INC. ``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 COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * 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 "core/html/PluginDocument.h"

#include "bindings/core/v8/ExceptionStatePlaceholder.h"
#include "core/HTMLNames.h"
#include "core/dom/RawDataDocumentParser.h"
#include "core/frame/FrameView.h"
#include "core/frame/LocalFrame.h"
#include "core/frame/UseCounter.h"
#include "core/html/HTMLBodyElement.h"
#include "core/html/HTMLEmbedElement.h"
#include "core/html/HTMLHtmlElement.h"
#include "core/layout/LayoutEmbeddedObject.h"
#include "core/loader/DocumentLoader.h"
#include "core/loader/FrameLoader.h"
#include "core/loader/FrameLoaderClient.h"
#include "core/plugins/PluginView.h"

namespace blink {

using namespace HTMLNames;

// FIXME: Share more code with MediaDocumentParser.
class PluginDocumentParser : public RawDataDocumentParser {
 public:
  static PluginDocumentParser* create(PluginDocument* document) {
    return new PluginDocumentParser(document);
  }

  DEFINE_INLINE_VIRTUAL_TRACE() {
    visitor->trace(m_embedElement);
    RawDataDocumentParser::trace(visitor);
  }

 private:
  PluginDocumentParser(Document* document)
      : RawDataDocumentParser(document), m_embedElement(nullptr) {}

  void appendBytes(const char*, size_t) override;

  void finish() override;

  void createDocumentStructure();

  PluginView* pluginView() const;

  Member<HTMLEmbedElement> m_embedElement;
};

void PluginDocumentParser::createDocumentStructure() {
  // FIXME: Assert we have a loader to figure out why the original null checks
  // and assert were added for the security bug in
  // http://trac.webkit.org/changeset/87566
  DCHECK(document());
  RELEASE_ASSERT(document()->loader());

  LocalFrame* frame = document()->frame();
  if (!frame)
    return;

  // FIXME: Why does this check settings?
  if (!frame->settings() ||
      !frame->loader().allowPlugins(NotAboutToInstantiatePlugin))
    return;

  HTMLHtmlElement* rootElement = HTMLHtmlElement::create(*document());
  document()->appendChild(rootElement);
  rootElement->insertedByParser();
  if (isStopped())
    return;  // runScriptsAtDocumentElementAvailable can detach the frame.

  HTMLBodyElement* body = HTMLBodyElement::create(*document());
  body->setAttribute(styleAttr,
                     "background-color: rgb(38,38,38); height: 100%; width: "
                     "100%; overflow: hidden; margin: 0");
  rootElement->appendChild(body);
  if (isStopped()) {
    // Possibly detached by a mutation event listener installed in
    // runScriptsAtDocumentElementAvailable.
    return;
  }

  m_embedElement = HTMLEmbedElement::create(*document());
  m_embedElement->setAttribute(widthAttr, "100%");
  m_embedElement->setAttribute(heightAttr, "100%");
  m_embedElement->setAttribute(nameAttr, "plugin");
  m_embedElement->setAttribute(idAttr, "plugin");
  m_embedElement->setAttribute(srcAttr,
                               AtomicString(document()->url().getString()));
  m_embedElement->setAttribute(typeAttr, document()->loader()->mimeType());
  body->appendChild(m_embedElement);
  if (isStopped()) {
    // Possibly detached by a mutation event listener installed in
    // runScriptsAtDocumentElementAvailable.
    return;
  }

  toPluginDocument(document())->setPluginNode(m_embedElement.get());

  document()->updateStyleAndLayout();

  // We need the plugin to load synchronously so we can get the PluginView
  // below so flush the layout tasks now instead of waiting on the timer.
  frame->view()->flushAnyPendingPostLayoutTasks();
  // Focus the plugin here, as the line above is where the plugin is created.
  if (frame->isMainFrame()) {
    m_embedElement->focus();
    if (isStopped()) {
      // Possibly detached by a mutation event listener installed in
      // runScriptsAtDocumentElementAvailable.
      return;
    }
  }

  if (PluginView* view = pluginView())
    view->didReceiveResponse(document()->loader()->response());
}

void PluginDocumentParser::appendBytes(const char* data, size_t length) {
  if (!m_embedElement) {
    createDocumentStructure();
    if (isStopped())
      return;
  }

  if (!length)
    return;
  if (PluginView* view = pluginView())
    view->didReceiveData(data, length);
}

void PluginDocumentParser::finish() {
  m_embedElement = nullptr;
  RawDataDocumentParser::finish();
}

PluginView* PluginDocumentParser::pluginView() const {
  if (Widget* widget = toPluginDocument(document())->pluginWidget()) {
    SECURITY_DCHECK(widget->isPluginContainer());
    return toPluginView(widget);
  }
  return 0;
}

PluginDocument::PluginDocument(const DocumentInit& initializer)
    : HTMLDocument(initializer, PluginDocumentClass) {
  setCompatibilityMode(QuirksMode);
  lockCompatibilityMode();
  UseCounter::count(*this, UseCounter::PluginDocument);
  if (!isInMainFrame())
    UseCounter::count(*this, UseCounter::PluginDocumentInFrame);
}

DocumentParser* PluginDocument::createParser() {
  return PluginDocumentParser::create(this);
}

Widget* PluginDocument::pluginWidget() {
  if (m_pluginNode && m_pluginNode->layoutObject()) {
    CHECK(m_pluginNode->layoutObject()->isEmbeddedObject());
    Widget* widget =
        toLayoutEmbeddedObject(m_pluginNode->layoutObject())->widget();
    if (!widget || !widget->isPluginContainer())
      return nullptr;
    return widget;
  }
  return 0;
}

Node* PluginDocument::pluginNode() {
  return m_pluginNode.get();
}

void PluginDocument::shutdown() {
  // Release the plugin node so that we don't have a circular reference.
  m_pluginNode = nullptr;
  HTMLDocument::shutdown();
}

DEFINE_TRACE(PluginDocument) {
  visitor->trace(m_pluginNode);
  HTMLDocument::trace(visitor);
}

}  // namespace blink