/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/EventStates.h"
#include "mozilla/dom/HTMLFormSubmission.h"
#include "mozilla/dom/HTMLObjectElement.h"
#include "mozilla/dom/HTMLObjectElementBinding.h"
#include "mozilla/dom/ElementInlines.h"
#include "mozilla/dom/WindowProxyHolder.h"
#include "nsAttrValueInlines.h"
#include "nsGkAtoms.h"
#include "nsError.h"
#include "mozilla/dom/Document.h"
#include "nsIPluginDocument.h"
#include "nsIObjectFrame.h"
#include "nsNPAPIPluginInstance.h"
#include "nsIWidget.h"
#include "nsContentUtils.h"
#ifdef XP_MACOSX
#  include "mozilla/EventDispatcher.h"
#  include "mozilla/dom/Event.h"
#  include "nsFocusManager.h"
#endif

namespace mozilla {
namespace dom {

HTMLObjectElement::HTMLObjectElement(
    already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
    FromParser aFromParser)
    : nsGenericHTMLFormElement(std::move(aNodeInfo), NS_FORM_OBJECT),
      mIsDoneAddingChildren(!aFromParser) {
  RegisterActivityObserver();
  SetIsNetworkCreated(aFromParser == FROM_PARSER_NETWORK);

  // <object> is always barred from constraint validation.
  SetBarredFromConstraintValidation(true);

  // By default we're in the loading state
  AddStatesSilently(NS_EVENT_STATE_LOADING);
}

HTMLObjectElement::~HTMLObjectElement() {
#ifdef XP_MACOSX
  OnFocusBlurPlugin(this, false);
#endif
  UnregisterActivityObserver();
  DestroyImageLoadingContent();
}

bool HTMLObjectElement::IsInteractiveHTMLContent(bool aIgnoreTabindex) const {
  return HasAttr(kNameSpaceID_None, nsGkAtoms::usemap) ||
         nsGenericHTMLFormElement::IsInteractiveHTMLContent(aIgnoreTabindex);
}

void HTMLObjectElement::AsyncEventRunning(AsyncEventDispatcher* aEvent) {
  nsImageLoadingContent::AsyncEventRunning(aEvent);
}

bool HTMLObjectElement::IsDoneAddingChildren() { return mIsDoneAddingChildren; }

void HTMLObjectElement::DoneAddingChildren(bool aHaveNotified) {
  mIsDoneAddingChildren = true;

  // If we're already in a document, we need to trigger the load
  // Otherwise, BindToTree takes care of that.
  if (IsInComposedDoc()) {
    StartObjectLoad(aHaveNotified, false);
  }
}

NS_IMPL_CYCLE_COLLECTION_CLASS(HTMLObjectElement)

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(HTMLObjectElement,
                                                  nsGenericHTMLFormElement)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mValidity)
  nsObjectLoadingContent::Traverse(tmp, cb);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(HTMLObjectElement,
                                                nsGenericHTMLFormElement)
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mValidity)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END

NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED(
    HTMLObjectElement, nsGenericHTMLFormElement, imgINotificationObserver,
    nsIRequestObserver, nsIStreamListener, nsIFrameLoaderOwner,
    nsIObjectLoadingContent, nsIImageLoadingContent, nsIChannelEventSink,
    nsIConstraintValidation)

NS_IMPL_ELEMENT_CLONE(HTMLObjectElement)

#ifdef XP_MACOSX

static nsIWidget* GetWidget(Element* aElement) {
  return nsContentUtils::WidgetForDocument(aElement->OwnerDoc());
}

Element* HTMLObjectElement::sLastFocused = nullptr;  // Weak

class PluginFocusSetter : public Runnable {
 public:
  PluginFocusSetter(nsIWidget* aWidget, Element* aElement)
      : Runnable("PluginFocusSetter"), mWidget(aWidget), mElement(aElement) {}

  NS_IMETHOD Run() override {
    if (mElement) {
      HTMLObjectElement::sLastFocused = mElement;
      bool value = true;
      mWidget->SetPluginFocused(value);
    } else if (!HTMLObjectElement::sLastFocused) {
      bool value = false;
      mWidget->SetPluginFocused(value);
    }

    return NS_OK;
  }

 private:
  nsCOMPtr<nsIWidget> mWidget;
  nsCOMPtr<Element> mElement;
};

void HTMLObjectElement::OnFocusBlurPlugin(Element* aElement, bool aFocus) {
  // In general we don't want to call nsIWidget::SetPluginFocused() for any
  // Element that doesn't have a plugin running.  But if SetPluginFocused(true)
  // was just called for aElement while it had a plugin running, we want to
  // make sure nsIWidget::SetPluginFocused(false) gets called for it now, even
  // if aFocus is true.
  if (aFocus) {
    nsCOMPtr<nsIObjectLoadingContent> olc = do_QueryInterface(aElement);
    bool hasRunningPlugin = false;
    if (olc) {
      hasRunningPlugin =
          static_cast<nsObjectLoadingContent*>(olc.get())->HasRunningPlugin();
    }
    if (!hasRunningPlugin) {
      aFocus = false;
    }
  }

  if (aFocus || aElement == sLastFocused) {
    if (!aFocus) {
      sLastFocused = nullptr;
    }
    nsIWidget* widget = GetWidget(aElement);
    if (widget) {
      nsContentUtils::AddScriptRunner(
          new PluginFocusSetter(widget, aFocus ? aElement : nullptr));
    }
  }
}

void HTMLObjectElement::HandlePluginCrashed(Element* aElement) {
  OnFocusBlurPlugin(aElement, false);
}

void HTMLObjectElement::HandlePluginInstantiated(Element* aElement) {
  // If aElement is already focused when a plugin is instantiated, we need
  // to initiate a call to nsIWidget::SetPluginFocused(true).  Otherwise
  // keyboard input won't work in a click-to-play plugin until aElement
  // loses focus and regains it.
  nsFocusManager* fm = nsFocusManager::GetFocusManager();
  if (fm && fm->GetFocusedElement() == aElement) {
    OnFocusBlurPlugin(aElement, true);
  }
}

void HTMLObjectElement::HandleFocusBlurPlugin(Element* aElement,
                                              WidgetEvent* aEvent) {
  if (!aEvent->IsTrusted()) {
    return;
  }
  switch (aEvent->mMessage) {
    case eFocus: {
      OnFocusBlurPlugin(aElement, true);
      break;
    }
    case eBlur: {
      OnFocusBlurPlugin(aElement, false);
      break;
    }
    default:
      break;
  }
}

NS_IMETHODIMP
HTMLObjectElement::PostHandleEvent(EventChainPostVisitor& aVisitor) {
  HandleFocusBlurPlugin(this, aVisitor.mEvent);
  return NS_OK;
}

#endif  // #ifdef XP_MACOSX

nsresult HTMLObjectElement::BindToTree(Document* aDocument, nsIContent* aParent,
                                       nsIContent* aBindingParent) {
  nsresult rv =
      nsGenericHTMLFormElement::BindToTree(aDocument, aParent, aBindingParent);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = nsObjectLoadingContent::BindToTree(aDocument, aParent, aBindingParent);
  NS_ENSURE_SUCCESS(rv, rv);

  // Don't kick off load from being bound to a plugin document - the plugin
  // document will call nsObjectLoadingContent::InitializeFromChannel() for the
  // initial load.
  nsCOMPtr<nsIPluginDocument> pluginDoc = do_QueryInterface(aDocument);

  // If we already have all the children, start the load.
  if (mIsDoneAddingChildren && !pluginDoc) {
    void (HTMLObjectElement::*start)() = &HTMLObjectElement::StartObjectLoad;
    nsContentUtils::AddScriptRunner(
        NewRunnableMethod("dom::HTMLObjectElement::BindToTree", this, start));
  }

  return NS_OK;
}

void HTMLObjectElement::UnbindFromTree(bool aDeep, bool aNullParent) {
#ifdef XP_MACOSX
  // When a page is reloaded (when an Document's content is removed), the
  // focused element isn't necessarily sent an eBlur event. See
  // nsFocusManager::ContentRemoved(). This means that a widget may think it
  // still contains a focused plugin when it doesn't -- which in turn can
  // disable text input in the browser window. See bug 1137229.
  OnFocusBlurPlugin(this, false);
#endif
  nsObjectLoadingContent::UnbindFromTree(aDeep, aNullParent);
  nsGenericHTMLFormElement::UnbindFromTree(aDeep, aNullParent);
}

nsresult HTMLObjectElement::AfterSetAttr(int32_t aNamespaceID, nsAtom* aName,
                                         const nsAttrValue* aValue,
                                         const nsAttrValue* aOldValue,
                                         nsIPrincipal* aSubjectPrincipal,
                                         bool aNotify) {
  nsresult rv = AfterMaybeChangeAttr(aNamespaceID, aName, aNotify);
  NS_ENSURE_SUCCESS(rv, rv);

  return nsGenericHTMLFormElement::AfterSetAttr(
      aNamespaceID, aName, aValue, aOldValue, aSubjectPrincipal, aNotify);
}

nsresult HTMLObjectElement::OnAttrSetButNotChanged(
    int32_t aNamespaceID, nsAtom* aName, const nsAttrValueOrString& aValue,
    bool aNotify) {
  nsresult rv = AfterMaybeChangeAttr(aNamespaceID, aName, aNotify);
  NS_ENSURE_SUCCESS(rv, rv);

  return nsGenericHTMLFormElement::OnAttrSetButNotChanged(aNamespaceID, aName,
                                                          aValue, aNotify);
}

nsresult HTMLObjectElement::AfterMaybeChangeAttr(int32_t aNamespaceID,
                                                 nsAtom* aName, bool aNotify) {
  if (aNamespaceID == kNameSpaceID_None) {
    // if aNotify is false, we are coming from the parser or some such place;
    // we'll get bound after all the attributes have been set, so we'll do the
    // object load from BindToTree/DoneAddingChildren.
    // Skip the LoadObject call in that case.
    // We also don't want to start loading the object when we're not yet in
    // a document, just in case that the caller wants to set additional
    // attributes before inserting the node into the document.
    if (aNotify && IsInComposedDoc() && mIsDoneAddingChildren &&
        aName == nsGkAtoms::data && !BlockEmbedOrObjectContentLoading()) {
      return LoadObject(aNotify, true);
    }
  }

  return NS_OK;
}

bool HTMLObjectElement::IsFocusableForTabIndex() {
  Document* doc = GetComposedDoc();
  if (!doc || doc->HasFlag(NODE_IS_EDITABLE)) {
    return false;
  }

  return IsEditableRoot() ||
         ((Type() == eType_Document || Type() == eType_FakePlugin) &&
          nsContentUtils::IsSubDocumentTabbable(this));
}

bool HTMLObjectElement::IsHTMLFocusable(bool aWithMouse, bool* aIsFocusable,
                                        int32_t* aTabIndex) {
  // TODO: this should probably be managed directly by IsHTMLFocusable.
  // See bug 597242.
  Document* doc = GetComposedDoc();
  if (!doc || doc->HasFlag(NODE_IS_EDITABLE)) {
    if (aTabIndex) {
      *aTabIndex = TabIndex();
    }

    *aIsFocusable = false;

    return false;
  }

  // This method doesn't call nsGenericHTMLFormElement intentionally.
  // TODO: It should probably be changed when bug 597242 will be fixed.
  if (Type() == eType_Plugin || IsEditableRoot() ||
      ((Type() == eType_Document || Type() == eType_FakePlugin) &&
       nsContentUtils::IsSubDocumentTabbable(this))) {
    // Has plugin content: let the plugin decide what to do in terms of
    // internal focus from mouse clicks
    if (aTabIndex) {
      *aTabIndex = TabIndex();
    }

    *aIsFocusable = true;

    return false;
  }

  // TODO: this should probably be managed directly by IsHTMLFocusable.
  // See bug 597242.
  const nsAttrValue* attrVal = mAttrs.GetAttr(nsGkAtoms::tabindex);

  *aIsFocusable = attrVal && attrVal->Type() == nsAttrValue::eInteger;

  if (aTabIndex && *aIsFocusable) {
    *aTabIndex = attrVal->GetIntegerValue();
  }

  return false;
}

nsIContent::IMEState HTMLObjectElement::GetDesiredIMEState() {
  if (Type() == eType_Plugin) {
    return IMEState(IMEState::PLUGIN);
  }

  return nsGenericHTMLFormElement::GetDesiredIMEState();
}

NS_IMETHODIMP
HTMLObjectElement::Reset() { return NS_OK; }

NS_IMETHODIMP
HTMLObjectElement::SubmitNamesValues(HTMLFormSubmission* aFormSubmission) {
  nsAutoString name;
  if (!GetAttr(kNameSpaceID_None, nsGkAtoms::name, name)) {
    // No name, don't submit.

    return NS_OK;
  }

  nsIFrame* frame = GetPrimaryFrame();

  nsIObjectFrame* objFrame = do_QueryFrame(frame);
  if (!objFrame) {
    // No frame, nothing to submit.

    return NS_OK;
  }

  RefPtr<nsNPAPIPluginInstance> pi = objFrame->GetPluginInstance();
  if (!pi) {
    return NS_OK;
  }

  nsAutoString value;
  nsresult rv = pi->GetFormValue(value);
  NS_ENSURE_SUCCESS(rv, rv);

  return aFormSubmission->AddNameValuePair(name, value);
}

int32_t HTMLObjectElement::TabIndexDefault() {
  return IsFocusableForTabIndex() ? 0 : -1;
}

Nullable<WindowProxyHolder> HTMLObjectElement::GetContentWindow(
    nsIPrincipal& aSubjectPrincipal) {
  Document* doc = GetContentDocument(aSubjectPrincipal);
  if (doc) {
    nsPIDOMWindowOuter* win = doc->GetWindow();
    if (win) {
      return WindowProxyHolder(win->GetBrowsingContext());
    }
  }

  return nullptr;
}

bool HTMLObjectElement::ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
                                       const nsAString& aValue,
                                       nsIPrincipal* aMaybeScriptedPrincipal,
                                       nsAttrValue& aResult) {
  if (aNamespaceID == kNameSpaceID_None) {
    if (aAttribute == nsGkAtoms::align) {
      return ParseAlignValue(aValue, aResult);
    }
    if (ParseImageAttribute(aAttribute, aValue, aResult)) {
      return true;
    }
  }

  return nsGenericHTMLFormElement::ParseAttribute(
      aNamespaceID, aAttribute, aValue, aMaybeScriptedPrincipal, aResult);
}

void HTMLObjectElement::MapAttributesIntoRule(
    const nsMappedAttributes* aAttributes, MappedDeclarations& aDecls) {
  nsGenericHTMLFormElement::MapImageAlignAttributeInto(aAttributes, aDecls);
  nsGenericHTMLFormElement::MapImageBorderAttributeInto(aAttributes, aDecls);
  nsGenericHTMLFormElement::MapImageMarginAttributeInto(aAttributes, aDecls);
  nsGenericHTMLFormElement::MapImageSizeAttributesInto(aAttributes, aDecls);
  nsGenericHTMLFormElement::MapCommonAttributesInto(aAttributes, aDecls);
}

NS_IMETHODIMP_(bool)
HTMLObjectElement::IsAttributeMapped(const nsAtom* aAttribute) const {
  static const MappedAttributeEntry* const map[] = {
      sCommonAttributeMap,
      sImageMarginSizeAttributeMap,
      sImageBorderAttributeMap,
      sImageAlignAttributeMap,
  };

  return FindAttributeDependence(aAttribute, map);
}

nsMapRuleToAttributesFunc HTMLObjectElement::GetAttributeMappingFunction()
    const {
  return &MapAttributesIntoRule;
}

void HTMLObjectElement::StartObjectLoad(bool aNotify, bool aForce) {
  // BindToTree can call us asynchronously, and we may be removed from the tree
  // in the interim
  if (!IsInComposedDoc() || !OwnerDoc()->IsActive() ||
      BlockEmbedOrObjectContentLoading()) {
    return;
  }

  LoadObject(aNotify, aForce);
  SetIsNetworkCreated(false);
}

EventStates HTMLObjectElement::IntrinsicState() const {
  return nsGenericHTMLFormElement::IntrinsicState() | ObjectState();
}

uint32_t HTMLObjectElement::GetCapabilities() const {
  return nsObjectLoadingContent::GetCapabilities() | eFallbackIfClassIDPresent;
}

void HTMLObjectElement::DestroyContent() {
  nsObjectLoadingContent::DestroyContent();
  nsGenericHTMLFormElement::DestroyContent();
}

nsresult HTMLObjectElement::CopyInnerTo(Element* aDest) {
  nsresult rv = nsGenericHTMLFormElement::CopyInnerTo(aDest);
  NS_ENSURE_SUCCESS(rv, rv);

  if (aDest->OwnerDoc()->IsStaticDocument()) {
    CreateStaticClone(static_cast<HTMLObjectElement*>(aDest));
  }

  return rv;
}

JSObject* HTMLObjectElement::WrapNode(JSContext* aCx,
                                      JS::Handle<JSObject*> aGivenProto) {
  JS::Rooted<JSObject*> obj(
      aCx, HTMLObjectElement_Binding::Wrap(aCx, this, aGivenProto));
  if (!obj) {
    return nullptr;
  }
  SetupProtoChain(aCx, obj);
  return obj;
}

}  // namespace dom
}  // namespace mozilla

NS_IMPL_NS_NEW_HTML_ELEMENT_CHECK_PARSER(Object)