/* -*- 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/. */

// Local Includes
#include "nsDocShellTreeOwner.h"
#include "nsWebBrowser.h"

// Helper Classes
#include "nsContentUtils.h"
#include "nsStyleCoord.h"
#include "nsSize.h"
#include "mozilla/ReflowInput.h"
#include "nsIServiceManager.h"
#include "nsComponentManagerUtils.h"
#include "nsString.h"
#include "nsAtom.h"
#include "nsReadableUtils.h"
#include "nsUnicharUtils.h"
#include "nsISimpleEnumerator.h"
#include "mozilla/LookAndFeel.h"

// Interfaces needed to be included
#include "nsPresContext.h"
#include "nsITooltipListener.h"
#include "nsINode.h"
#include "Link.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/MouseEvent.h"
#include "mozilla/dom/SVGTitleElement.h"
#include "nsIFormControl.h"
#include "nsIImageLoadingContent.h"
#include "nsIWebNavigation.h"
#include "nsIPresShell.h"
#include "nsIStringBundle.h"
#include "nsPIDOMWindow.h"
#include "nsPIWindowRoot.h"
#include "nsIWindowWatcher.h"
#include "nsPIWindowWatcher.h"
#include "nsIPrompt.h"
#include "nsITabParent.h"
#include "nsITabChild.h"
#include "nsRect.h"
#include "nsIWebBrowserChromeFocus.h"
#include "nsIContent.h"
#include "imgIContainer.h"
#include "nsPresContext.h"
#include "nsViewManager.h"
#include "nsView.h"
#include "nsIConstraintValidation.h"
#include "mozilla/Attributes.h"
#include "mozilla/EventListenerManager.h"
#include "mozilla/dom/DragEvent.h"
#include "mozilla/dom/Event.h" // for Event
#include "mozilla/dom/File.h" // for input type=file
#include "mozilla/dom/FileList.h" // for input type=file
#include "mozilla/TextEvents.h"

using namespace mozilla;
using namespace mozilla::dom;

// A helper routine that navigates the tricky path from a |nsWebBrowser| to
// a |EventTarget| via the window root and chrome event handler.
static nsresult
GetDOMEventTarget(nsWebBrowser* aInBrowser, EventTarget** aTarget)
{
  if (!aInBrowser) {
    return NS_ERROR_INVALID_POINTER;
  }

  nsCOMPtr<mozIDOMWindowProxy> domWindow;
  aInBrowser->GetContentDOMWindow(getter_AddRefs(domWindow));
  if (!domWindow) {
    return NS_ERROR_FAILURE;
  }

  auto* outerWindow = nsPIDOMWindowOuter::From(domWindow);
  nsPIDOMWindowOuter* rootWindow = outerWindow->GetPrivateRoot();
  NS_ENSURE_TRUE(rootWindow, NS_ERROR_FAILURE);
  nsCOMPtr<EventTarget> target = rootWindow->GetChromeEventHandler();
  NS_ENSURE_TRUE(target, NS_ERROR_FAILURE);
  target.forget(aTarget);

  return NS_OK;
}

nsDocShellTreeOwner::nsDocShellTreeOwner()
  : mWebBrowser(nullptr)
  , mTreeOwner(nullptr)
  , mPrimaryContentShell(nullptr)
  , mWebBrowserChrome(nullptr)
  , mOwnerWin(nullptr)
  , mOwnerRequestor(nullptr)
{
}

nsDocShellTreeOwner::~nsDocShellTreeOwner()
{
  RemoveChromeListeners();
}

NS_IMPL_ADDREF(nsDocShellTreeOwner)
NS_IMPL_RELEASE(nsDocShellTreeOwner)

NS_INTERFACE_MAP_BEGIN(nsDocShellTreeOwner)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDocShellTreeOwner)
  NS_INTERFACE_MAP_ENTRY(nsIDocShellTreeOwner)
  NS_INTERFACE_MAP_ENTRY(nsIBaseWindow)
  NS_INTERFACE_MAP_ENTRY(nsIInterfaceRequestor)
  NS_INTERFACE_MAP_ENTRY(nsIWebProgressListener)
  NS_INTERFACE_MAP_ENTRY(nsIDOMEventListener)
  NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
NS_INTERFACE_MAP_END

//*****************************************************************************
// nsDocShellTreeOwner::nsIInterfaceRequestor
//*****************************************************************************

NS_IMETHODIMP
nsDocShellTreeOwner::GetInterface(const nsIID& aIID, void** aSink)
{
  NS_ENSURE_ARG_POINTER(aSink);

  if (NS_SUCCEEDED(QueryInterface(aIID, aSink))) {
    return NS_OK;
  }

  if (aIID.Equals(NS_GET_IID(nsIWebBrowserChromeFocus))) {
    if (mWebBrowserChromeWeak != nullptr) {
      return mWebBrowserChromeWeak->QueryReferent(aIID, aSink);
    }
    return mOwnerWin->QueryInterface(aIID, aSink);
  }

  if (aIID.Equals(NS_GET_IID(nsIPrompt))) {
    nsCOMPtr<nsIPrompt> prompt;
    EnsurePrompter();
    prompt = mPrompter;
    if (prompt) {
      prompt.forget(aSink);
      return NS_OK;
    }
    return NS_NOINTERFACE;
  }

  if (aIID.Equals(NS_GET_IID(nsIAuthPrompt))) {
    nsCOMPtr<nsIAuthPrompt> prompt;
    EnsureAuthPrompter();
    prompt = mAuthPrompter;
    if (prompt) {
      prompt.forget(aSink);
      return NS_OK;
    }
    return NS_NOINTERFACE;
  }

  nsCOMPtr<nsIInterfaceRequestor> req = GetOwnerRequestor();
  if (req) {
    return req->GetInterface(aIID, aSink);
  }

  return NS_NOINTERFACE;
}

//*****************************************************************************
// nsDocShellTreeOwner::nsIDocShellTreeOwner
//*****************************************************************************

void
nsDocShellTreeOwner::EnsurePrompter()
{
  if (mPrompter) {
    return;
  }

  nsCOMPtr<nsIWindowWatcher> wwatch(do_GetService(NS_WINDOWWATCHER_CONTRACTID));
  if (wwatch && mWebBrowser) {
    nsCOMPtr<mozIDOMWindowProxy> domWindow;
    mWebBrowser->GetContentDOMWindow(getter_AddRefs(domWindow));
    if (domWindow) {
      wwatch->GetNewPrompter(domWindow, getter_AddRefs(mPrompter));
    }
  }
}

void
nsDocShellTreeOwner::EnsureAuthPrompter()
{
  if (mAuthPrompter) {
    return;
  }

  nsCOMPtr<nsIWindowWatcher> wwatch(do_GetService(NS_WINDOWWATCHER_CONTRACTID));
  if (wwatch && mWebBrowser) {
    nsCOMPtr<mozIDOMWindowProxy> domWindow;
    mWebBrowser->GetContentDOMWindow(getter_AddRefs(domWindow));
    if (domWindow) {
      wwatch->GetNewAuthPrompter(domWindow, getter_AddRefs(mAuthPrompter));
    }
  }
}

void
nsDocShellTreeOwner::AddToWatcher()
{
  if (mWebBrowser) {
    nsCOMPtr<mozIDOMWindowProxy> domWindow;
    mWebBrowser->GetContentDOMWindow(getter_AddRefs(domWindow));
    if (domWindow) {
      nsCOMPtr<nsPIWindowWatcher> wwatch(
        do_GetService(NS_WINDOWWATCHER_CONTRACTID));
      if (wwatch) {
        nsCOMPtr<nsIWebBrowserChrome> webBrowserChrome = GetWebBrowserChrome();
        if (webBrowserChrome) {
          wwatch->AddWindow(domWindow, webBrowserChrome);
        }
      }
    }
  }
}

void
nsDocShellTreeOwner::RemoveFromWatcher()
{
  if (mWebBrowser) {
    nsCOMPtr<mozIDOMWindowProxy> domWindow;
    mWebBrowser->GetContentDOMWindow(getter_AddRefs(domWindow));
    if (domWindow) {
      nsCOMPtr<nsPIWindowWatcher> wwatch(
        do_GetService(NS_WINDOWWATCHER_CONTRACTID));
      if (wwatch) {
        wwatch->RemoveWindow(domWindow);
      }
    }
  }
}

void
nsDocShellTreeOwner::EnsureContentTreeOwner()
{
  if (mContentTreeOwner) {
    return;
  }

  mContentTreeOwner = new nsDocShellTreeOwner();
  nsCOMPtr<nsIWebBrowserChrome> browserChrome = GetWebBrowserChrome();
  if (browserChrome) {
    mContentTreeOwner->SetWebBrowserChrome(browserChrome);
  }

  if (mWebBrowser) {
    mContentTreeOwner->WebBrowser(mWebBrowser);
  }
}

NS_IMETHODIMP
nsDocShellTreeOwner::ContentShellAdded(nsIDocShellTreeItem* aContentShell,
                                       bool aPrimary)
{
  if (mTreeOwner)
    return mTreeOwner->ContentShellAdded(aContentShell, aPrimary);

  EnsureContentTreeOwner();
  aContentShell->SetTreeOwner(mContentTreeOwner);

  if (aPrimary) {
    mPrimaryContentShell = aContentShell;
    mPrimaryTabParent = nullptr;
  }
  return NS_OK;
}

NS_IMETHODIMP
nsDocShellTreeOwner::ContentShellRemoved(nsIDocShellTreeItem* aContentShell)
{
  if (mTreeOwner) {
    return mTreeOwner->ContentShellRemoved(aContentShell);
  }

  if (mPrimaryContentShell == aContentShell) {
    mPrimaryContentShell = nullptr;
  }

  return NS_OK;
}

NS_IMETHODIMP
nsDocShellTreeOwner::GetPrimaryContentShell(nsIDocShellTreeItem** aShell)
{
  NS_ENSURE_ARG_POINTER(aShell);

  if (mTreeOwner) {
    return mTreeOwner->GetPrimaryContentShell(aShell);
  }

  nsCOMPtr<nsIDocShellTreeItem> shell;
  if (!mPrimaryTabParent) {
    shell =
      mPrimaryContentShell ? mPrimaryContentShell : mWebBrowser->mDocShell;
  }
  shell.forget(aShell);

  return NS_OK;
}

NS_IMETHODIMP
nsDocShellTreeOwner::TabParentAdded(nsITabParent* aTab, bool aPrimary)
{
  if (mTreeOwner) {
    return mTreeOwner->TabParentAdded(aTab, aPrimary);
  }

  if (aPrimary) {
    mPrimaryTabParent = aTab;
    mPrimaryContentShell = nullptr;
  } else if (mPrimaryTabParent == aTab) {
    mPrimaryTabParent = nullptr;
  }

  return NS_OK;
}

NS_IMETHODIMP
nsDocShellTreeOwner::TabParentRemoved(nsITabParent* aTab)
{
  if (mTreeOwner) {
    return mTreeOwner->TabParentRemoved(aTab);
  }

  if (aTab == mPrimaryTabParent) {
    mPrimaryTabParent = nullptr;
  }

  return NS_OK;
}

NS_IMETHODIMP
nsDocShellTreeOwner::GetPrimaryTabParent(nsITabParent** aTab)
{
  if (mTreeOwner) {
    return mTreeOwner->GetPrimaryTabParent(aTab);
  }

  nsCOMPtr<nsITabParent> tab = mPrimaryTabParent;
  tab.forget(aTab);
  return NS_OK;
}

NS_IMETHODIMP
nsDocShellTreeOwner::GetPrimaryContentSize(int32_t* aWidth,
                                           int32_t* aHeight)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsDocShellTreeOwner::SetPrimaryContentSize(int32_t aWidth,
                                           int32_t aHeight)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsDocShellTreeOwner::GetRootShellSize(int32_t* aWidth,
                                      int32_t* aHeight)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsDocShellTreeOwner::SetRootShellSize(int32_t aWidth,
                                      int32_t aHeight)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsDocShellTreeOwner::SizeShellTo(nsIDocShellTreeItem* aShellItem,
                                 int32_t aCX, int32_t aCY)
{
  nsCOMPtr<nsIWebBrowserChrome> webBrowserChrome = GetWebBrowserChrome();

  NS_ENSURE_STATE(mTreeOwner || webBrowserChrome);

  if (mTreeOwner) {
    return mTreeOwner->SizeShellTo(aShellItem, aCX, aCY);
  }

  if (aShellItem == mWebBrowser->mDocShell) {
    nsCOMPtr<nsITabChild> tabChild = do_QueryInterface(webBrowserChrome);
    if (tabChild) {
      // The XUL window to resize is in the parent process, but there we
      // won't be able to get aShellItem to do the hack in nsXULWindow::SizeShellTo,
      // so let's send the width and height of aShellItem too.
      nsCOMPtr<nsIBaseWindow> shellAsWin(do_QueryInterface(aShellItem));
      NS_ENSURE_TRUE(shellAsWin, NS_ERROR_FAILURE);

      int32_t width = 0;
      int32_t height = 0;
      shellAsWin->GetSize(&width, &height);
      return tabChild->RemoteSizeShellTo(aCX, aCY, width, height);
    }
    // XXX: this is weird, but we used to call a method here
    // (webBrowserChrome->SizeBrowserTo()) whose implementations all failed
    // like this, so...
    return NS_ERROR_NOT_IMPLEMENTED;
  }

  NS_ENSURE_TRUE(aShellItem, NS_ERROR_FAILURE);

  nsCOMPtr<nsIDocument> document = aShellItem->GetDocument();
  NS_ENSURE_TRUE(document, NS_ERROR_FAILURE);

  NS_ENSURE_TRUE(document->GetDocumentElement(), NS_ERROR_FAILURE);

  // Set the preferred Size
  //XXX
  NS_ERROR("Implement this");
  /*
  Set the preferred size on the aShellItem.
  */

  RefPtr<nsPresContext> presContext;
  mWebBrowser->mDocShell->GetPresContext(getter_AddRefs(presContext));
  NS_ENSURE_TRUE(presContext, NS_ERROR_FAILURE);

  nsIPresShell* presShell = presContext->GetPresShell();
  NS_ENSURE_TRUE(presShell, NS_ERROR_FAILURE);

  NS_ENSURE_SUCCESS(
    presShell->ResizeReflow(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE),
    NS_ERROR_FAILURE);

  // XXX: this is weird, but we used to call a method here
  // (webBrowserChrome->SizeBrowserTo()) whose implementations all failed like
  // this, so...
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsDocShellTreeOwner::SetPersistence(bool aPersistPosition,
                                    bool aPersistSize,
                                    bool aPersistSizeMode)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsDocShellTreeOwner::GetPersistence(bool* aPersistPosition,
                                    bool* aPersistSize,
                                    bool* aPersistSizeMode)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsDocShellTreeOwner::GetTabCount(uint32_t* aResult)
{
  if (mTreeOwner) {
    return mTreeOwner->GetTabCount(aResult);
  }

  *aResult = 0;
  return NS_OK;
}

NS_IMETHODIMP
nsDocShellTreeOwner::GetHasPrimaryContent(bool* aResult)
{
  *aResult = mPrimaryTabParent || mPrimaryContentShell;
  return NS_OK;
}

//*****************************************************************************
// nsDocShellTreeOwner::nsIBaseWindow
//*****************************************************************************

NS_IMETHODIMP
nsDocShellTreeOwner::InitWindow(nativeWindow aParentNativeWindow,
                                nsIWidget* aParentWidget, int32_t aX,
                                int32_t aY, int32_t aCX, int32_t aCY)
{
  return NS_ERROR_NULL_POINTER;
}

NS_IMETHODIMP
nsDocShellTreeOwner::Create()
{
  return NS_ERROR_NULL_POINTER;
}

NS_IMETHODIMP
nsDocShellTreeOwner::Destroy()
{
  nsCOMPtr<nsIWebBrowserChrome> webBrowserChrome = GetWebBrowserChrome();
  if (webBrowserChrome) {
    // XXX: this is weird, but we used to call a method here
    // (webBrowserChrome->DestroyBrowserWindow()) whose implementations all
    // failed like this, so...
    return NS_ERROR_NOT_IMPLEMENTED;
  }

  return NS_ERROR_NULL_POINTER;
}

NS_IMETHODIMP
nsDocShellTreeOwner::GetUnscaledDevicePixelsPerCSSPixel(double* aScale)
{
  if (mWebBrowser) {
    return mWebBrowser->GetUnscaledDevicePixelsPerCSSPixel(aScale);
  }

  *aScale = 1.0;
  return NS_OK;
}

NS_IMETHODIMP
nsDocShellTreeOwner::GetDevicePixelsPerDesktopPixel(double* aScale)
{
  if (mWebBrowser) {
    return mWebBrowser->GetDevicePixelsPerDesktopPixel(aScale);
  }

  *aScale = 1.0;
  return NS_OK;
}

NS_IMETHODIMP
nsDocShellTreeOwner::SetPositionDesktopPix(int32_t aX, int32_t aY)
{
  if (mWebBrowser) {
    nsresult rv = mWebBrowser->SetPositionDesktopPix(aX, aY);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  double scale = 1.0;
  GetDevicePixelsPerDesktopPixel(&scale);
  return SetPosition(NSToIntRound(aX * scale), NSToIntRound(aY * scale));
}

NS_IMETHODIMP
nsDocShellTreeOwner::SetPosition(int32_t aX, int32_t aY)
{
  nsCOMPtr<nsIEmbeddingSiteWindow> ownerWin = GetOwnerWin();
  if (ownerWin) {
    return ownerWin->SetDimensions(nsIEmbeddingSiteWindow::DIM_FLAGS_POSITION,
                                   aX, aY, 0, 0);
  }
  return NS_ERROR_NULL_POINTER;
}

NS_IMETHODIMP
nsDocShellTreeOwner::GetPosition(int32_t* aX, int32_t* aY)
{
  nsCOMPtr<nsIEmbeddingSiteWindow> ownerWin = GetOwnerWin();
  if (ownerWin) {
    return ownerWin->GetDimensions(nsIEmbeddingSiteWindow::DIM_FLAGS_POSITION,
                                   aX, aY, nullptr, nullptr);
  }
  return NS_ERROR_NULL_POINTER;
}

NS_IMETHODIMP
nsDocShellTreeOwner::SetSize(int32_t aCX, int32_t aCY, bool aRepaint)
{
  nsCOMPtr<nsIEmbeddingSiteWindow> ownerWin = GetOwnerWin();
  if (ownerWin) {
    return ownerWin->SetDimensions(nsIEmbeddingSiteWindow::DIM_FLAGS_SIZE_OUTER,
                                   0, 0, aCX, aCY);
  }
  return NS_ERROR_NULL_POINTER;
}

NS_IMETHODIMP
nsDocShellTreeOwner::GetSize(int32_t* aCX, int32_t* aCY)
{
  nsCOMPtr<nsIEmbeddingSiteWindow> ownerWin = GetOwnerWin();
  if (ownerWin) {
    return ownerWin->GetDimensions(nsIEmbeddingSiteWindow::DIM_FLAGS_SIZE_OUTER,
                                   nullptr, nullptr, aCX, aCY);
  }
  return NS_ERROR_NULL_POINTER;
}

NS_IMETHODIMP
nsDocShellTreeOwner::SetPositionAndSize(int32_t aX, int32_t aY, int32_t aCX,
                                        int32_t aCY, uint32_t aFlags)
{
  nsCOMPtr<nsIEmbeddingSiteWindow> ownerWin = GetOwnerWin();
  if (ownerWin) {
    return ownerWin->SetDimensions(
      nsIEmbeddingSiteWindow::DIM_FLAGS_SIZE_OUTER |
        nsIEmbeddingSiteWindow::DIM_FLAGS_POSITION,
      aX, aY, aCX, aCY);
  }
  return NS_ERROR_NULL_POINTER;
}

NS_IMETHODIMP
nsDocShellTreeOwner::GetPositionAndSize(int32_t* aX, int32_t* aY, int32_t* aCX,
                                        int32_t* aCY)
{
  nsCOMPtr<nsIEmbeddingSiteWindow> ownerWin = GetOwnerWin();
  if (ownerWin) {
    return ownerWin->GetDimensions(
      nsIEmbeddingSiteWindow::DIM_FLAGS_SIZE_OUTER |
        nsIEmbeddingSiteWindow::DIM_FLAGS_POSITION,
      aX, aY, aCX, aCY);
  }
  return NS_ERROR_NULL_POINTER;
}

NS_IMETHODIMP
nsDocShellTreeOwner::Repaint(bool aForce)
{
  return NS_ERROR_NULL_POINTER;
}

NS_IMETHODIMP
nsDocShellTreeOwner::GetParentWidget(nsIWidget** aParentWidget)
{
  return NS_ERROR_NULL_POINTER;
}

NS_IMETHODIMP
nsDocShellTreeOwner::SetParentWidget(nsIWidget* aParentWidget)
{
  return NS_ERROR_NULL_POINTER;
}

NS_IMETHODIMP
nsDocShellTreeOwner::GetParentNativeWindow(nativeWindow* aParentNativeWindow)
{
  nsCOMPtr<nsIEmbeddingSiteWindow> ownerWin = GetOwnerWin();
  if (ownerWin) {
    return ownerWin->GetSiteWindow(aParentNativeWindow);
  }
  return NS_ERROR_NULL_POINTER;
}

NS_IMETHODIMP
nsDocShellTreeOwner::SetParentNativeWindow(nativeWindow aParentNativeWindow)
{
  return NS_ERROR_NULL_POINTER;
}

NS_IMETHODIMP
nsDocShellTreeOwner::GetNativeHandle(nsAString& aNativeHandle)
{
  // the nativeHandle should be accessed from nsIXULWindow
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsDocShellTreeOwner::GetVisibility(bool* aVisibility)
{
  nsCOMPtr<nsIEmbeddingSiteWindow> ownerWin = GetOwnerWin();
  if (ownerWin) {
    return ownerWin->GetVisibility(aVisibility);
  }
  return NS_ERROR_NULL_POINTER;
}

NS_IMETHODIMP
nsDocShellTreeOwner::SetVisibility(bool aVisibility)
{
  nsCOMPtr<nsIEmbeddingSiteWindow> ownerWin = GetOwnerWin();
  if (ownerWin) {
    return ownerWin->SetVisibility(aVisibility);
  }
  return NS_ERROR_NULL_POINTER;
}

NS_IMETHODIMP
nsDocShellTreeOwner::GetEnabled(bool* aEnabled)
{
  NS_ENSURE_ARG_POINTER(aEnabled);
  *aEnabled = true;
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsDocShellTreeOwner::SetEnabled(bool aEnabled)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsDocShellTreeOwner::GetMainWidget(nsIWidget** aMainWidget)
{
  return NS_ERROR_NULL_POINTER;
}

NS_IMETHODIMP
nsDocShellTreeOwner::SetFocus()
{
  nsCOMPtr<nsIEmbeddingSiteWindow> ownerWin = GetOwnerWin();
  if (ownerWin) {
    return ownerWin->SetFocus();
  }
  return NS_ERROR_NULL_POINTER;
}

NS_IMETHODIMP
nsDocShellTreeOwner::GetTitle(nsAString& aTitle)
{
  nsCOMPtr<nsIEmbeddingSiteWindow> ownerWin = GetOwnerWin();
  if (ownerWin) {
    return ownerWin->GetTitle(aTitle);
  }
  return NS_ERROR_NULL_POINTER;
}

NS_IMETHODIMP
nsDocShellTreeOwner::SetTitle(const nsAString& aTitle)
{
  nsCOMPtr<nsIEmbeddingSiteWindow> ownerWin = GetOwnerWin();
  if (ownerWin) {
    return ownerWin->SetTitle(aTitle);
  }
  return NS_ERROR_NULL_POINTER;
}

//*****************************************************************************
// nsDocShellTreeOwner::nsIWebProgressListener
//*****************************************************************************

NS_IMETHODIMP
nsDocShellTreeOwner::OnProgressChange(nsIWebProgress* aProgress,
                                      nsIRequest* aRequest,
                                      int32_t aCurSelfProgress,
                                      int32_t aMaxSelfProgress,
                                      int32_t aCurTotalProgress,
                                      int32_t aMaxTotalProgress)
{
  // In the absence of DOM document creation event, this method is the
  // most convenient place to install the mouse listener on the
  // DOM document.
  return AddChromeListeners();
}

NS_IMETHODIMP
nsDocShellTreeOwner::OnStateChange(nsIWebProgress* aProgress,
                                   nsIRequest* aRequest,
                                   uint32_t aProgressStateFlags,
                                   nsresult aStatus)
{
  return NS_OK;
}

NS_IMETHODIMP
nsDocShellTreeOwner::OnLocationChange(nsIWebProgress* aWebProgress,
                                      nsIRequest* aRequest,
                                      nsIURI* aURI,
                                      uint32_t aFlags)
{
  return NS_OK;
}

NS_IMETHODIMP
nsDocShellTreeOwner::OnStatusChange(nsIWebProgress* aWebProgress,
                                    nsIRequest* aRequest,
                                    nsresult aStatus,
                                    const char16_t* aMessage)
{
  return NS_OK;
}

NS_IMETHODIMP
nsDocShellTreeOwner::OnSecurityChange(nsIWebProgress* aWebProgress,
                                      nsIRequest* aRequest,
                                      uint32_t aOldState,
                                      uint32_t aState,
                                      const nsAString& aContentBlockingLogJSON)
{
  return NS_OK;
}

//*****************************************************************************
// nsDocShellTreeOwner: Accessors
//*****************************************************************************

void
nsDocShellTreeOwner::WebBrowser(nsWebBrowser* aWebBrowser)
{
  if (!aWebBrowser) {
    RemoveChromeListeners();
  }
  if (aWebBrowser != mWebBrowser) {
    mPrompter = nullptr;
    mAuthPrompter = nullptr;
  }

  mWebBrowser = aWebBrowser;

  if (mContentTreeOwner) {
    mContentTreeOwner->WebBrowser(aWebBrowser);
    if (!aWebBrowser) {
      mContentTreeOwner = nullptr;
    }
  }
}

nsWebBrowser*
nsDocShellTreeOwner::WebBrowser()
{
  return mWebBrowser;
}

NS_IMETHODIMP
nsDocShellTreeOwner::SetTreeOwner(nsIDocShellTreeOwner* aTreeOwner)
{
  if (aTreeOwner) {
    nsCOMPtr<nsIWebBrowserChrome> webBrowserChrome(do_GetInterface(aTreeOwner));
    NS_ENSURE_TRUE(webBrowserChrome, NS_ERROR_INVALID_ARG);
    NS_ENSURE_SUCCESS(SetWebBrowserChrome(webBrowserChrome),
                      NS_ERROR_INVALID_ARG);
    mTreeOwner = aTreeOwner;
  } else {
    mTreeOwner = nullptr;
    nsCOMPtr<nsIWebBrowserChrome> webBrowserChrome = GetWebBrowserChrome();
    if (!webBrowserChrome) {
      NS_ENSURE_SUCCESS(SetWebBrowserChrome(nullptr), NS_ERROR_FAILURE);
    }
  }

  return NS_OK;
}

NS_IMETHODIMP
nsDocShellTreeOwner::SetWebBrowserChrome(nsIWebBrowserChrome* aWebBrowserChrome)
{
  if (!aWebBrowserChrome) {
    mWebBrowserChrome = nullptr;
    mOwnerWin = nullptr;
    mOwnerRequestor = nullptr;
    mWebBrowserChromeWeak = nullptr;
  } else {
    nsCOMPtr<nsISupportsWeakReference> supportsweak =
      do_QueryInterface(aWebBrowserChrome);
    if (supportsweak) {
      supportsweak->GetWeakReference(getter_AddRefs(mWebBrowserChromeWeak));
    } else {
      nsCOMPtr<nsIEmbeddingSiteWindow> ownerWin(
        do_QueryInterface(aWebBrowserChrome));
      nsCOMPtr<nsIInterfaceRequestor> requestor(
        do_QueryInterface(aWebBrowserChrome));

      // it's ok for ownerWin or requestor to be null.
      mWebBrowserChrome = aWebBrowserChrome;
      mOwnerWin = ownerWin;
      mOwnerRequestor = requestor;
    }
  }

  if (mContentTreeOwner) {
    mContentTreeOwner->SetWebBrowserChrome(aWebBrowserChrome);
  }

  return NS_OK;
}

// Hook up things to the chrome like context menus and tooltips, if the chrome
// has implemented the right interfaces.
NS_IMETHODIMP
nsDocShellTreeOwner::AddChromeListeners()
{
  nsresult rv = NS_OK;

  nsCOMPtr<nsIWebBrowserChrome> webBrowserChrome = GetWebBrowserChrome();
  if (!webBrowserChrome) {
    return NS_ERROR_FAILURE;
  }

  // install tooltips
  if (!mChromeTooltipListener) {
    nsCOMPtr<nsITooltipListener> tooltipListener(
      do_QueryInterface(webBrowserChrome));
    if (tooltipListener) {
      mChromeTooltipListener = new ChromeTooltipListener(mWebBrowser,
                                                         webBrowserChrome);
      rv = mChromeTooltipListener->AddChromeListeners();
    }
  }

  // register dragover and drop event listeners with the listener manager
  nsCOMPtr<EventTarget> target;
  GetDOMEventTarget(mWebBrowser, getter_AddRefs(target));

  EventListenerManager* elmP = target->GetOrCreateListenerManager();
  if (elmP) {
    elmP->AddEventListenerByType(this, NS_LITERAL_STRING("dragover"),
                                 TrustedEventsAtSystemGroupBubble());
    elmP->AddEventListenerByType(this, NS_LITERAL_STRING("drop"),
                                 TrustedEventsAtSystemGroupBubble());
  }

  return rv;
}

NS_IMETHODIMP
nsDocShellTreeOwner::RemoveChromeListeners()
{
  if (mChromeTooltipListener) {
    mChromeTooltipListener->RemoveChromeListeners();
    mChromeTooltipListener = nullptr;
  }

  nsCOMPtr<EventTarget> piTarget;
  GetDOMEventTarget(mWebBrowser, getter_AddRefs(piTarget));
  if (!piTarget) {
    return NS_OK;
  }

  EventListenerManager* elmP = piTarget->GetOrCreateListenerManager();
  if (elmP) {
    elmP->RemoveEventListenerByType(this, NS_LITERAL_STRING("dragover"),
                                    TrustedEventsAtSystemGroupBubble());
    elmP->RemoveEventListenerByType(this, NS_LITERAL_STRING("drop"),
                                    TrustedEventsAtSystemGroupBubble());
  }

  return NS_OK;
}

NS_IMETHODIMP
nsDocShellTreeOwner::HandleEvent(Event* aEvent)
{
  DragEvent* dragEvent = aEvent ? aEvent->AsDragEvent() : nullptr;
  if (NS_WARN_IF(!dragEvent)) {
    return NS_ERROR_INVALID_ARG;
  }

  if (dragEvent->DefaultPrevented()) {
    return NS_OK;
  }

  nsCOMPtr<nsIDroppedLinkHandler> handler =
    do_GetService("@mozilla.org/content/dropped-link-handler;1");
  if (!handler) {
    return NS_OK;
  }

  nsAutoString eventType;
  aEvent->GetType(eventType);
  if (eventType.EqualsLiteral("dragover")) {
    bool canDropLink = false;
    handler->CanDropLink(dragEvent, false, &canDropLink);
    if (canDropLink) {
      aEvent->PreventDefault();
    }
  } else if (eventType.EqualsLiteral("drop")) {
    nsIWebNavigation* webnav = static_cast<nsIWebNavigation*>(mWebBrowser);

    uint32_t linksCount;
    nsIDroppedLinkItem** links;
    if (webnav &&
        NS_SUCCEEDED(handler->DropLinks(dragEvent, true, &linksCount, &links))) {
      if (linksCount >= 1) {
        nsCOMPtr<nsIPrincipal> triggeringPrincipal;
        handler->GetTriggeringPrincipal(dragEvent,
                                        getter_AddRefs(triggeringPrincipal));
        if (triggeringPrincipal) {
          nsCOMPtr<nsIWebBrowserChrome> webBrowserChrome = GetWebBrowserChrome();
          if (webBrowserChrome) {
            nsCOMPtr<nsITabChild> tabChild = do_QueryInterface(webBrowserChrome);
            if (tabChild) {
              nsresult rv = tabChild->RemoteDropLinks(linksCount, links);
              for (uint32_t i = 0; i < linksCount; i++) {
                NS_RELEASE(links[i]);
              }
              free(links);
              return rv;
            }
          }
          nsAutoString url;
          if (NS_SUCCEEDED(links[0]->GetUrl(url))) {
            if (!url.IsEmpty()) {
#ifndef ANDROID
              MOZ_ASSERT(triggeringPrincipal, "nsDocShellTreeOwner::HandleEvent: Need a valid triggeringPrincipal");
#endif
              webnav->LoadURI(url, 0, nullptr, nullptr, nullptr,
                              triggeringPrincipal);
            }
          }

          for (uint32_t i = 0; i < linksCount; i++) {
            NS_RELEASE(links[i]);
          }
          free(links);
        }
      }
    } else {
      aEvent->StopPropagation();
      aEvent->PreventDefault();
    }
  }

  return NS_OK;
}

already_AddRefed<nsIWebBrowserChrome>
nsDocShellTreeOwner::GetWebBrowserChrome()
{
  nsCOMPtr<nsIWebBrowserChrome> chrome;
  if (mWebBrowserChromeWeak) {
    chrome = do_QueryReferent(mWebBrowserChromeWeak);
  } else if (mWebBrowserChrome) {
    chrome = mWebBrowserChrome;
  }
  return chrome.forget();
}

already_AddRefed<nsIEmbeddingSiteWindow>
nsDocShellTreeOwner::GetOwnerWin()
{
  nsCOMPtr<nsIEmbeddingSiteWindow> win;
  if (mWebBrowserChromeWeak) {
    win = do_QueryReferent(mWebBrowserChromeWeak);
  } else if (mOwnerWin) {
    win = mOwnerWin;
  }
  return win.forget();
}

already_AddRefed<nsIInterfaceRequestor>
nsDocShellTreeOwner::GetOwnerRequestor()
{
  nsCOMPtr<nsIInterfaceRequestor> req;
  if (mWebBrowserChromeWeak) {
    req = do_QueryReferent(mWebBrowserChromeWeak);
  } else if (mOwnerRequestor) {
    req = mOwnerRequestor;
  }
  return req.forget();
}

NS_IMPL_ISUPPORTS(ChromeTooltipListener, nsIDOMEventListener)

ChromeTooltipListener::ChromeTooltipListener(nsWebBrowser* aInBrowser,
                                             nsIWebBrowserChrome* aInChrome)
  : mWebBrowser(aInBrowser)
  , mWebBrowserChrome(aInChrome)
  , mTooltipListenerInstalled(false)
  , mMouseClientX(0)
  , mMouseClientY(0)
  , mMouseScreenX(0)
  , mMouseScreenY(0)
  , mShowingTooltip(false)
  , mTooltipShownOnce(false)
{
}

ChromeTooltipListener::~ChromeTooltipListener()
{
}

nsITooltipTextProvider*
ChromeTooltipListener::GetTooltipTextProvider() {
  if (!mTooltipTextProvider) {
    mTooltipTextProvider = do_GetService(NS_TOOLTIPTEXTPROVIDER_CONTRACTID);
  }

  if (!mTooltipTextProvider) {
    mTooltipTextProvider = do_GetService(NS_DEFAULTTOOLTIPTEXTPROVIDER_CONTRACTID);
  }

  return mTooltipTextProvider;
}

// Hook up things to the chrome like context menus and tooltips, if the chrome
// has implemented the right interfaces.
NS_IMETHODIMP
ChromeTooltipListener::AddChromeListeners()
{
  if (!mEventTarget) {
    GetDOMEventTarget(mWebBrowser, getter_AddRefs(mEventTarget));
  }

  // Register the appropriate events for tooltips, but only if
  // the embedding chrome cares.
  nsresult rv = NS_OK;
  nsCOMPtr<nsITooltipListener> tooltipListener(
    do_QueryInterface(mWebBrowserChrome));
  if (tooltipListener && !mTooltipListenerInstalled) {
    rv = AddTooltipListener();
    if (NS_FAILED(rv)) {
      return rv;
    }
  }

  return rv;
}

// Subscribe to the events that will allow us to track tooltips. We need "mouse"
// for mouseExit, "mouse motion" for mouseMove, and "key" for keyDown. As we
// add the listeners, keep track of how many succeed so we can clean up
// correctly in Release().
NS_IMETHODIMP
ChromeTooltipListener::AddTooltipListener()
{
  if (mEventTarget) {
    nsresult rv = NS_OK;
#ifndef XP_WIN
    rv = mEventTarget->AddSystemEventListener(NS_LITERAL_STRING("keydown"),
                                              this, false, false);
    NS_ENSURE_SUCCESS(rv, rv);
#endif
    rv = mEventTarget->AddSystemEventListener(NS_LITERAL_STRING("mousedown"),
                                              this, false, false);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = mEventTarget->AddSystemEventListener(NS_LITERAL_STRING("mouseout"),
                                              this, false, false);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = mEventTarget->AddSystemEventListener(NS_LITERAL_STRING("mousemove"),
                                              this, false, false);
    NS_ENSURE_SUCCESS(rv, rv);

    mTooltipListenerInstalled = true;
  }

  return NS_OK;
}

// Unsubscribe from the various things we've hooked up to the window root.
NS_IMETHODIMP
ChromeTooltipListener::RemoveChromeListeners()
{
  HideTooltip();

  if (mTooltipListenerInstalled) {
    RemoveTooltipListener();
  }

  mEventTarget = nullptr;

  // it really doesn't matter if these fail...
  return NS_OK;
}

// Unsubscribe from all the various tooltip events that we were listening to.
NS_IMETHODIMP
ChromeTooltipListener::RemoveTooltipListener()
{
  if (mEventTarget) {
#ifndef XP_WIN
    mEventTarget->RemoveSystemEventListener(NS_LITERAL_STRING("keydown"),
                                            this, false);
#endif
    mEventTarget->RemoveSystemEventListener(NS_LITERAL_STRING("mousedown"),
                                            this, false);
    mEventTarget->RemoveSystemEventListener(NS_LITERAL_STRING("mouseout"),
                                            this, false);
    mEventTarget->RemoveSystemEventListener(NS_LITERAL_STRING("mousemove"),
                                            this, false);
    mTooltipListenerInstalled = false;
  }

  return NS_OK;
}

NS_IMETHODIMP
ChromeTooltipListener::HandleEvent(Event* aEvent)
{
  nsAutoString eventType;
  aEvent->GetType(eventType);

  if (eventType.EqualsLiteral("mousedown")) {
    return HideTooltip();
  } else if (eventType.EqualsLiteral("keydown")) {
    WidgetKeyboardEvent* keyEvent = aEvent->WidgetEventPtr()->AsKeyboardEvent();
    if (!keyEvent->IsModifierKeyEvent()) {
      return HideTooltip();
    }

    return NS_OK;
  } else if (eventType.EqualsLiteral("mouseout")) {
    // Reset flag so that tooltip will display on the next MouseMove
    mTooltipShownOnce = false;
    return HideTooltip();
  } else if (eventType.EqualsLiteral("mousemove")) {
    return MouseMove(aEvent);
  }

  NS_ERROR("Unexpected event type");
  return NS_OK;
}

// If we're a tooltip, fire off a timer to see if a tooltip should be shown. If
// the timer fires, we cache the node in |mPossibleTooltipNode|.
nsresult
ChromeTooltipListener::MouseMove(Event* aMouseEvent)
{
  MouseEvent* mouseEvent = aMouseEvent->AsMouseEvent();
  if (!mouseEvent) {
    return NS_OK;
  }

  // stash the coordinates of the event so that we can still get back to it from
  // within the timer callback. On win32, we'll get a MouseMove event even when
  // a popup goes away -- even when the mouse doesn't change position! To get
  // around this, we make sure the mouse has really moved before proceeding.
  int32_t newMouseX = mouseEvent->ClientX();
  int32_t newMouseY = mouseEvent->ClientY();
  if (mMouseClientX == newMouseX && mMouseClientY == newMouseY) {
    return NS_OK;
  }

  // Filter out minor mouse movements.
  if (mShowingTooltip &&
      (abs(mMouseClientX - newMouseX) <= kTooltipMouseMoveTolerance) &&
      (abs(mMouseClientY - newMouseY) <= kTooltipMouseMoveTolerance)) {
    return NS_OK;
  }

  mMouseClientX = newMouseX;
  mMouseClientY = newMouseY;
  mMouseScreenX = mouseEvent->ScreenX(CallerType::System);
  mMouseScreenY = mouseEvent->ScreenY(CallerType::System);

  if (mTooltipTimer) {
    mTooltipTimer->Cancel();
    mTooltipTimer = nullptr;
  }

  if (!mShowingTooltip) {
    nsIEventTarget* target = nullptr;
    if (nsCOMPtr<EventTarget> eventTarget = aMouseEvent->GetComposedTarget()) {
      mPossibleTooltipNode = do_QueryInterface(eventTarget);
      nsCOMPtr<nsIGlobalObject> global(eventTarget->GetOwnerGlobal());
      if (global) {
        target = global->EventTargetFor(TaskCategory::UI);
      }
    }

    if (mPossibleTooltipNode) {
      nsresult rv = NS_NewTimerWithFuncCallback(
        getter_AddRefs(mTooltipTimer),
        sTooltipCallback,
        this,
        LookAndFeel::GetInt(LookAndFeel::eIntID_TooltipDelay, 500),
        nsITimer::TYPE_ONE_SHOT,
        "ChromeTooltipListener::MouseMove",
        target);
      if (NS_FAILED(rv)) {
        mPossibleTooltipNode = nullptr;
        NS_WARNING("Could not create a timer for tooltip tracking");
      }
    }
  } else {
    mTooltipShownOnce = true;
    return HideTooltip();
  }

  return NS_OK;
}

// Tell the registered chrome that they should show the tooltip.
NS_IMETHODIMP
ChromeTooltipListener::ShowTooltip(int32_t aInXCoords, int32_t aInYCoords,
                                   const nsAString& aInTipText,
                                   const nsAString& aTipDir)
{
  nsresult rv = NS_OK;

  // do the work to call the client
  nsCOMPtr<nsITooltipListener> tooltipListener(
    do_QueryInterface(mWebBrowserChrome));
  if (tooltipListener) {
    rv = tooltipListener->OnShowTooltip(aInXCoords, aInYCoords,
                                        PromiseFlatString(aInTipText).get(),
                                        PromiseFlatString(aTipDir).get());
    if (NS_SUCCEEDED(rv)) {
      mShowingTooltip = true;
    }
  }

  return rv;
}

// Tell the registered chrome that they should rollup the tooltip
// NOTE: This routine is safe to call even if the popup is already closed.
NS_IMETHODIMP
ChromeTooltipListener::HideTooltip()
{
  nsresult rv = NS_OK;

  // shut down the relevant timers
  if (mTooltipTimer) {
    mTooltipTimer->Cancel();
    mTooltipTimer = nullptr;
    // release tooltip target
    mPossibleTooltipNode = nullptr;
  }

  // if we're showing the tip, tell the chrome to hide it
  if (mShowingTooltip) {
    nsCOMPtr<nsITooltipListener> tooltipListener(
      do_QueryInterface(mWebBrowserChrome));
    if (tooltipListener) {
      rv = tooltipListener->OnHideTooltip();
      if (NS_SUCCEEDED(rv)) {
        mShowingTooltip = false;
      }
    }
  }

  return rv;
}

// A timer callback, fired when the mouse has hovered inside of a frame for the
// appropriate amount of time. Getting to this point means that we should show
// the tooltip, but only after we determine there is an appropriate TITLE
// element.
//
// This relies on certain things being cached into the |aChromeTooltipListener|
// object passed to us by the timer:
//   -- the x/y coordinates of the mouse      (mMouseClientY, mMouseClientX)
//   -- the dom node the user hovered over    (mPossibleTooltipNode)
void
ChromeTooltipListener::sTooltipCallback(nsITimer* aTimer,
                                        void* aChromeTooltipListener)
{
  auto self = static_cast<ChromeTooltipListener*>(aChromeTooltipListener);
  if (self && self->mPossibleTooltipNode) {
    if (!self->mPossibleTooltipNode->IsInComposedDoc()) {
      // release tooltip target if there is one, NO MATTER WHAT
      self->mPossibleTooltipNode = nullptr;
      return;
    }

    // The actual coordinates we want to put the tooltip at are relative to the
    // toplevel docshell of our mWebBrowser.  We know what the screen
    // coordinates of the mouse event were, which means we just need the screen
    // coordinates of the docshell.  Unfortunately, there is no good way to
    // find those short of groveling for the presentation in that docshell and
    // finding the screen coords of its toplevel widget...
    nsCOMPtr<nsIDocShell> docShell =
      do_GetInterface(static_cast<nsIWebBrowser*>(self->mWebBrowser));
    nsCOMPtr<nsIPresShell> shell;
    if (docShell) {
      shell = docShell->GetPresShell();
    }

    nsIWidget* widget = nullptr;
    if (shell) {
      nsViewManager* vm = shell->GetViewManager();
      if (vm) {
        nsView* view = vm->GetRootView();
        if (view) {
          nsPoint offset;
          widget = view->GetNearestWidget(&offset);
        }
      }
    }

    if (!widget) {
      // release tooltip target if there is one, NO MATTER WHAT
      self->mPossibleTooltipNode = nullptr;
      return;
    }

    // if there is text associated with the node, show the tip and fire
    // off a timer to auto-hide it.
    nsITooltipTextProvider* tooltipProvider = self->GetTooltipTextProvider();
    if (tooltipProvider) {
      nsString tooltipText;
      nsString directionText;
      bool textFound = false;
      tooltipProvider->GetNodeText(
        self->mPossibleTooltipNode, getter_Copies(tooltipText),
        getter_Copies(directionText), &textFound);

      if (textFound &&
          (!self->mTooltipShownOnce ||
           tooltipText != self->mLastShownTooltipText)) {
        LayoutDeviceIntPoint screenDot = widget->WidgetToScreenOffset();
        double scaleFactor = 1.0;
        if (shell->GetPresContext()) {
          nsDeviceContext* dc = shell->GetPresContext()->DeviceContext();
          scaleFactor = double(AppUnitsPerCSSPixel()) /
                        dc->AppUnitsPerDevPixelAtUnitFullZoom();
        }
        // ShowTooltip expects widget-relative position.
        self->ShowTooltip(self->mMouseScreenX - screenDot.x / scaleFactor,
                          self->mMouseScreenY - screenDot.y / scaleFactor,
                          tooltipText, directionText);
        self->mLastShownTooltipText = std::move(tooltipText);
      }
    }

    // release tooltip target if there is one, NO MATTER WHAT
    self->mPossibleTooltipNode = nullptr;
  }
}