/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code.
 *
 * The Initial Developer of the Original Code is 
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Joe Hewitt <hewitt@netscape.com> (Original Author)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or 
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the NPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the NPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsFormFillController.h"

#include "nsFormHistory.h"
#include "nsIAutoCompleteResultTypes.h"
#include "nsString.h"
#include "nsReadableUtils.h"
#include "nsIServiceManager.h"
#include "nsIInterfaceRequestor.h"
#include "nsIDocShellTreeItem.h"
#include "nsIChromeEventHandler.h"
#include "nsPIDOMWindow.h"
#include "nsIWebNavigation.h"
#include "nsIContentViewer.h"
#include "nsIDOMEventTarget.h"
#include "nsIDOMKeyEvent.h"
#include "nsIDOMDocument.h"
#include "nsIDOMElement.h"
#include "nsIDOMNSHTMLInputElement.h"
#include "nsIScriptGlobalObject.h"
#include "nsIContent.h"
#include "nsIPresShell.h"
#include "nsIPresContext.h"
#include "nsIView.h"
#include "nsIFrame.h"
#include "nsIWidget.h"
#include "nsRect.h"

NS_INTERFACE_MAP_BEGIN(nsFormFillController)
  NS_INTERFACE_MAP_ENTRY(nsIFormFillController)
  NS_INTERFACE_MAP_ENTRY(nsIAutoCompleteInput)
  NS_INTERFACE_MAP_ENTRY(nsIAutoCompleteSearch)
  NS_INTERFACE_MAP_ENTRY(nsIDOMFocusListener)
  NS_INTERFACE_MAP_ENTRY(nsIDOMKeyListener)
  NS_INTERFACE_MAP_ENTRY(nsIDOMFormListener)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIFormFillController)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsIDOMEventListener, nsIDOMFocusListener)
NS_INTERFACE_MAP_END

NS_IMPL_ADDREF(nsFormFillController);
NS_IMPL_RELEASE(nsFormFillController);

nsFormFillController::nsFormFillController() :
  mTimeout(50),
  mMinResultsForPopup(1),
  mMaxRows(0),
  mDisableAutoComplete(PR_FALSE), 
  mCompleteDefaultIndex(PR_FALSE),
  mForceComplete(PR_FALSE),
  mSuppressOnInput(PR_FALSE)
{
  mController = do_CreateInstance("@mozilla.org/autocomplete/controller;1");

  mDocShells = do_CreateInstance("@mozilla.org/supports-array;1");
  mPopups = do_CreateInstance("@mozilla.org/supports-array;1");
}

nsFormFillController::~nsFormFillController()
{
  // Remove ourselves as a focus listener from all cached docShells
  PRUint32 count;
  mDocShells->Count(&count);
  for (PRUint32 i = 0; i < count; ++i) {
    nsCOMPtr<nsIDocShell> docShell;
    mDocShells->GetElementAt(i, getter_AddRefs(docShell));
    nsCOMPtr<nsIDOMWindow> domWindow = GetWindowForDocShell(docShell);
    RemoveFocusListener(domWindow);
  }
}

////////////////////////////////////////////////////////////////////////

nsRect&
GetScreenOrigin(nsIDOMElement* aElement)
{
  nsRect* rect = new nsRect(0,0,0,0);
  nsSize size;
 
  nsCOMPtr<nsIContent> content = do_QueryInterface(aElement);
  nsCOMPtr<nsIDocument> doc;
  content->GetDocument(getter_AddRefs(doc));

  if (doc) {
    // Get Presentation shell 0
    nsCOMPtr<nsIPresShell> presShell;
    doc->GetShellAt(0, getter_AddRefs(presShell));
    
    if (presShell) {
      nsCOMPtr<nsIPresContext> presContext;
      presShell->GetPresContext(getter_AddRefs(presContext));

      if (presContext) {
        // Get the scale from that Presentation Context
        float scale;
        presContext->GetTwipsToPixels(&scale);

        nsIFrame* frame;
        nsresult rv = presShell->GetPrimaryFrameFor(content, &frame);

        nsIView* view;
        nsPoint offset;
        frame->GetOffsetFromView(presContext, offset, &view);
        if (view) {
          nscoord dummy;
          nsCOMPtr<nsIWidget> widget;
          rv = view->GetOffsetFromWidget(&dummy, &dummy, *getter_AddRefs(widget));
          if (widget) {
            nsRect oldBox(0,0,0,0);
            widget->WidgetToScreen(oldBox, *rect);
          }
          
          nscoord viewX = 0, viewY = 0;
          view->GetPosition(&viewX, &viewY);

          rect->x += NSTwipsToIntPixels(offset.x+viewX, scale);
          rect->y += NSTwipsToIntPixels(offset.y+viewY, scale);
        }
        
        frame->GetSize(size);
        rect->width = NSTwipsToIntPixels(size.width, scale);
        rect->height = NSTwipsToIntPixels(size.height, scale);
      }
    }
  }
  
  return *rect;
}

////////////////////////////////////////////////////////////////////////
//// nsIFormFillController

NS_IMETHODIMP
nsFormFillController::AttachToBrowser(nsIDocShell *aDocShell, nsIAutoCompletePopup *aPopup)
{
  NS_ENSURE_TRUE(aDocShell && aPopup, NS_ERROR_ILLEGAL_VALUE);
  
  mDocShells->AppendElement(aDocShell);
  mPopups->AppendElement(aPopup);
  
  // Listen for focus events on the domWindow of the docShell
  nsCOMPtr<nsIDOMWindow> domWindow = GetWindowForDocShell(aDocShell);
  AddFocusListener(domWindow);

  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::DetachFromBrowser(nsIDocShell *aDocShell)
{
  PRInt32 index = GetIndexOfDocShell(aDocShell);
  NS_ENSURE_TRUE(index >= 0, NS_ERROR_FAILURE);
  
  // Stop listening for focus events on the domWindow of the docShell
  nsCOMPtr<nsIDocShell> docShell;
  mDocShells->GetElementAt(index, getter_AddRefs(docShell));
  nsCOMPtr<nsIDOMWindow> domWindow = GetWindowForDocShell(docShell);
  RemoveFocusListener(domWindow);
    
  mDocShells->RemoveElementAt(index);
  mPopups->RemoveElementAt(index);
  
  return NS_OK;
}

////////////////////////////////////////////////////////////////////////
//// nsIAutoCompleteInput

NS_IMETHODIMP
nsFormFillController::GetPopup(nsIAutoCompletePopup **aPopup)
{
  *aPopup = mFocusedPopup;
  NS_IF_ADDREF(*aPopup);
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::GetController(nsIAutoCompleteController **aController)
{
  *aController = mController;
  NS_IF_ADDREF(*aController);
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::GetPopupOpen(PRBool *aPopupOpen)
{
  if (mFocusedPopup)
    mFocusedPopup->GetPopupOpen(aPopupOpen);
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::SetPopupOpen(PRBool aPopupOpen)
{
  if (aPopupOpen) {
    nsRect popupRect = GetScreenOrigin(mFocusedInput);
    if (mFocusedPopup)
      mFocusedPopup->OpenPopup(this, popupRect.x, popupRect.y+popupRect.height, popupRect.width);
  } else {
    mFocusedPopup->ClosePopup();
  }
    
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::GetDisableAutoComplete(PRBool *aDisableAutoComplete)
{
  *aDisableAutoComplete = mDisableAutoComplete;
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::SetDisableAutoComplete(PRBool aDisableAutoComplete)
{
  mDisableAutoComplete = aDisableAutoComplete;
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::GetCompleteDefaultIndex(PRBool *aCompleteDefaultIndex)
{
  *aCompleteDefaultIndex = mCompleteDefaultIndex;
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::SetCompleteDefaultIndex(PRBool aCompleteDefaultIndex)
{
  mCompleteDefaultIndex = aCompleteDefaultIndex;
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::GetForceComplete(PRBool *aForceComplete)
{
  *aForceComplete = mForceComplete;
  return NS_OK;
}

NS_IMETHODIMP nsFormFillController::SetForceComplete(PRBool aForceComplete)
{
  mForceComplete = aForceComplete;
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::GetMinResultsForPopup(PRUint32 *aMinResultsForPopup)
{
  *aMinResultsForPopup = mMinResultsForPopup;
  return NS_OK;
}

NS_IMETHODIMP nsFormFillController::SetMinResultsForPopup(PRUint32 aMinResultsForPopup)
{
  mMinResultsForPopup = aMinResultsForPopup;
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::GetMaxRows(PRUint32 *aMaxRows)
{
  *aMaxRows = mMaxRows;
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::SetMaxRows(PRUint32 aMaxRows)
{
  mMaxRows = aMaxRows;
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::GetShowCommentColumn(PRUint32 *aShowCommentColumn)
{
  *aShowCommentColumn = PR_FALSE;
  return NS_OK;
}

NS_IMETHODIMP nsFormFillController::SetShowCommentColumn(PRUint32 aShowCommentColumn)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsFormFillController::GetTimeout(PRUint32 *aTimeout)
{
  *aTimeout = mTimeout;
  return NS_OK;
}

NS_IMETHODIMP nsFormFillController::SetTimeout(PRUint32 aTimeout)
{
  mTimeout = aTimeout;
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::SetSearchParam(const nsAString &aSearchParam)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsFormFillController::GetSearchParam(nsAString &aSearchParam)
{
  if (!mFocusedInput) {
    NS_WARNING("mFocusedInput is null for some reason! avoiding a crash. should find out why... - ben");
    return NS_ERROR_FAILURE; // XXX why? fix me. 
  }
    
  mFocusedInput->GetName(aSearchParam);
  if (aSearchParam.IsEmpty())
    mFocusedInput->GetId(aSearchParam);
  
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::GetSearchCount(PRUint32 *aSearchCount)
{
  *aSearchCount = 1;
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::GetSearchAt(PRUint32 index, nsACString & _retval)
{
  _retval.Assign("form-history");
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::GetTextValue(nsAString & aTextValue)
{
  mFocusedInput->GetValue(aTextValue);
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::SetTextValue(const nsAString & aTextValue)
{
  mSuppressOnInput = PR_TRUE;
  mFocusedInput->SetValue(aTextValue);
  mSuppressOnInput = PR_FALSE;
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::GetSelectionStart(PRInt32 *aSelectionStart)
{
  nsCOMPtr<nsIDOMNSHTMLInputElement> input = do_QueryInterface(mFocusedInput);
  if (input)
    input->GetSelectionStart(aSelectionStart);
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::GetSelectionEnd(PRInt32 *aSelectionEnd)
{
  nsCOMPtr<nsIDOMNSHTMLInputElement> input = do_QueryInterface(mFocusedInput);
  if (input)
    input->GetSelectionEnd(aSelectionEnd);
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::SelectTextRange(PRInt32 aStartIndex, PRInt32 aEndIndex)
{
  nsCOMPtr<nsIDOMNSHTMLInputElement> input = do_QueryInterface(mFocusedInput);
  if (input)
    input->SetSelectionRange(aStartIndex, aEndIndex);
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::OnSearchComplete()
{
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::OnTextEntered(PRBool *_retval)
{
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::OnTextReverted(PRBool *_retval)
{
  return NS_OK;
}

////////////////////////////////////////////////////////////////////////
//// nsIAutoCompleteSearch


NS_IMETHODIMP
nsFormFillController::StartSearch(const nsAString &aSearchString, const nsAString &aSearchParam,
                                  nsIAutoCompleteResult *aPreviousResult, nsIAutoCompleteObserver *aListener)
{
  nsFormHistory *history = nsFormHistory::GetInstance();

  nsIAutoCompleteMdbResult *result = nsnull;
  history->AutoCompleteSearch(aSearchParam, aSearchString, NS_STATIC_CAST(nsIAutoCompleteMdbResult *, aPreviousResult), &result);

  NS_IF_RELEASE(history);

  aListener->OnSearchResult(this, result);  
  
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::StopSearch()
{
  return NS_OK;
}

////////////////////////////////////////////////////////////////////////
//// nsIDOMEventListener

NS_IMETHODIMP
nsFormFillController::HandleEvent(nsIDOMEvent* aEvent)
{
  return NS_OK; 
}

////////////////////////////////////////////////////////////////////////
//// nsIDOMFocusListener

NS_IMETHODIMP
nsFormFillController::Focus(nsIDOMEvent* aEvent)
{
  nsCOMPtr<nsIDOMEventTarget> target;
  aEvent->GetTarget(getter_AddRefs(target));
  
  nsCOMPtr<nsIDOMHTMLInputElement> input = do_QueryInterface(target);
  if (input) {
    nsAutoString type;
    input->GetType(type);

    nsAutoString autocomplete; 
    input->GetAttribute(NS_LITERAL_STRING("autocomplete"), autocomplete);

    if (type.Equals(NS_LITERAL_STRING("text")) && 
        !autocomplete.Equals(NS_LITERAL_STRING("off")))
      StartControllingInput(input);
  }
    
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::Blur(nsIDOMEvent* aEvent)
{
  if (mFocusedInput)
    StopControllingInput();
  
  return NS_OK;
}

////////////////////////////////////////////////////////////////////////
//// nsIDOMKeyListener

NS_IMETHODIMP
nsFormFillController::KeyDown(nsIDOMEvent* aEvent)
{
  return NS_OK;
} 

NS_IMETHODIMP
nsFormFillController::KeyUp(nsIDOMEvent* aEvent)
{
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::KeyPress(nsIDOMEvent* aEvent)
{
  nsCOMPtr<nsIDOMKeyEvent> keyEvent = do_QueryInterface(aEvent);
  
  PRBool cancel = PR_FALSE;

  PRUint32 k;
  keyEvent->GetKeyCode(&k);
  switch (k) {
  case nsIDOMKeyEvent::DOM_VK_BACK_SPACE:
  case nsIDOMKeyEvent::DOM_VK_DELETE:
    mController->HandleText();
    break;
  case nsIDOMKeyEvent::DOM_VK_UP:
    mController->HandleKeyNavigation(nsIAutoCompleteController::KEY_UP, &cancel);
    break;
  case nsIDOMKeyEvent::DOM_VK_DOWN:
    mController->HandleKeyNavigation(nsIAutoCompleteController::KEY_DOWN, &cancel);
    break;
  case nsIDOMKeyEvent::DOM_VK_LEFT:
    mController->HandleKeyNavigation(nsIAutoCompleteController::KEY_LEFT, &cancel);
    break;
  case nsIDOMKeyEvent::DOM_VK_RIGHT:
    mController->HandleKeyNavigation(nsIAutoCompleteController::KEY_RIGHT, &cancel);
    break;
  case nsIDOMKeyEvent::DOM_VK_PAGE_UP:
    mController->HandleKeyNavigation(nsIAutoCompleteController::KEY_PAGE_UP, &cancel);
    break;
  case nsIDOMKeyEvent::DOM_VK_PAGE_DOWN:
    mController->HandleKeyNavigation(nsIAutoCompleteController::KEY_PAGE_DOWN, &cancel);
    break;
  case nsIDOMKeyEvent::DOM_VK_ESCAPE:
    mController->HandleEscape(&cancel);
    break;
  case nsIDOMKeyEvent::DOM_VK_TAB:
    mController->HandleTab();
    cancel = PR_FALSE;
    break;
  case nsIDOMKeyEvent::DOM_VK_RETURN:
    mController->HandleEnter(&cancel);
    break;
  }
  
  if (cancel) {
    aEvent->StopPropagation();
    aEvent->PreventDefault();
  }
  
  return NS_OK;
}

////////////////////////////////////////////////////////////////////////
//// nsIDOMFormListener

NS_IMETHODIMP
nsFormFillController::Submit(nsIDOMEvent* aEvent)
{
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::Reset(nsIDOMEvent* aEvent)
{
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::Change(nsIDOMEvent* aEvent)
{
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::Select(nsIDOMEvent* aEvent)
{
  return NS_OK;
}

NS_IMETHODIMP
nsFormFillController::Input(nsIDOMEvent* aEvent)
{
  if (mSuppressOnInput)
    return NS_OK;

  return mController->HandleText();
}


////////////////////////////////////////////////////////////////////////
//// nsFormFillController

void
nsFormFillController::AddFocusListener(nsIDOMWindow *aWindow)
{
  if (!aWindow)
    return;

  nsCOMPtr<nsPIDOMWindow> privateDOMWindow(do_QueryInterface(aWindow));
  nsCOMPtr<nsIChromeEventHandler> chromeEventHandler;
  if (privateDOMWindow)
    privateDOMWindow->GetChromeEventHandler(getter_AddRefs(chromeEventHandler));
  nsCOMPtr<nsIDOMEventTarget> target(do_QueryInterface(chromeEventHandler));

  if (target)
    target->AddEventListener(NS_LITERAL_STRING("focus"),
                             NS_STATIC_CAST(nsIDOMFocusListener *, this),
                             PR_TRUE);
}

void
nsFormFillController::RemoveFocusListener(nsIDOMWindow *aWindow)
{
  if (!aWindow)
    return;

  StopControllingInput();
  
  nsCOMPtr<nsPIDOMWindow> privateDOMWindow(do_QueryInterface(aWindow));
  nsCOMPtr<nsIChromeEventHandler> chromeEventHandler;
  if (privateDOMWindow)
    privateDOMWindow->GetChromeEventHandler(getter_AddRefs(chromeEventHandler));
  nsCOMPtr<nsIDOMEventTarget> target(do_QueryInterface(chromeEventHandler));

  target->RemoveEventListener(NS_LITERAL_STRING("focus"),
                            NS_STATIC_CAST(nsIDOMFocusListener *, this),
                            PR_TRUE);
}

void
nsFormFillController::AddKeyListener(nsIDOMHTMLInputElement *aInput)
{
  if (aInput) {
    mFocusedInput = aInput;
    
    nsCOMPtr<nsIDOMEventTarget> target = do_QueryInterface(aInput);

    target->AddEventListener(NS_LITERAL_STRING("input"),
                             NS_STATIC_CAST(nsIDOMFormListener *, this),
                             PR_TRUE);

    target->AddEventListener(NS_LITERAL_STRING("keypress"),
                             NS_STATIC_CAST(nsIDOMKeyListener *, this),
                             PR_TRUE);
  }
}

void
nsFormFillController::RemoveKeyListener()
{
  if (mFocusedInput) {

    nsCOMPtr<nsIDOMEventTarget> target = do_QueryInterface(mFocusedInput);

    target->RemoveEventListener(NS_LITERAL_STRING("input"),
                                NS_STATIC_CAST(nsIDOMFormListener *, this),
                                PR_TRUE);

    target->RemoveEventListener(NS_LITERAL_STRING("keypress"),
                                NS_STATIC_CAST(nsIDOMKeyListener *, this),
                                PR_TRUE);

    mFocusedInput = nsnull;
  }
}

void
nsFormFillController::StartControllingInput(nsIDOMHTMLInputElement *aInput)
{
  // Make sure we're not still attached to an input
  StopControllingInput(); 

  // Find the currently focused docShell
  nsCOMPtr<nsIDocShell> docShell = GetDocShellForInput(aInput);
  PRInt32 index = GetIndexOfDocShell(docShell);
  if (index < 0)
    return;
  
  // Cache the popup for the focused docShell
  mPopups->GetElementAt(index, getter_AddRefs(mFocusedPopup));
  
  // Start listening for key events
  AddKeyListener(aInput);

  // Now we are the autocomplete controller's bitch
  mController->SetInput(this);
}

void
nsFormFillController::StopControllingInput()
{
  RemoveKeyListener();

  // Reset the controller's input, but not if it has been switched
  // to another input already, which might happen if the user switches
  // focus by clicking another autocomplete textbox
  nsCOMPtr<nsIAutoCompleteInput> input;
  mController->GetInput(getter_AddRefs(input));
  if (input == this)
    mController->SetInput(nsnull);

  mFocusedInput = nsnull;
  mFocusedPopup = nsnull;
}

nsIDocShell *
nsFormFillController::GetDocShellForInput(nsIDOMHTMLInputElement *aInput)
{
  nsCOMPtr<nsIDOMDocument> domDoc;
  aInput->GetOwnerDocument(getter_AddRefs(domDoc));
  nsCOMPtr<nsIDocument> doc = do_QueryInterface(domDoc);
  
  nsCOMPtr<nsIScriptGlobalObject> ourGlobal;
  doc->GetScriptGlobalObject(getter_AddRefs(ourGlobal));
  nsCOMPtr<nsIDOMWindow> domWindow = do_QueryInterface(ourGlobal);

  nsCOMPtr<nsIInterfaceRequestor> ifreq(do_QueryInterface(domWindow));
  NS_ENSURE_TRUE(ifreq, NS_OK);
  nsCOMPtr<nsIWebNavigation> webNav;
  ifreq->GetInterface(NS_GET_IID(nsIWebNavigation), getter_AddRefs(webNav));
  nsCOMPtr<nsIDocShell> docShell = do_QueryInterface(webNav);
  return docShell;
}

nsIDOMWindow *
nsFormFillController::GetWindowForDocShell(nsIDocShell *aDocShell)
{
  nsCOMPtr<nsIContentViewer> contentViewer;
  aDocShell->GetContentViewer(getter_AddRefs(contentViewer));
  NS_ENSURE_TRUE(contentViewer, nsnull);

  nsCOMPtr<nsIDOMDocument> domDoc;
  contentViewer->GetDOMDocument(getter_AddRefs(domDoc));
  nsCOMPtr<nsIDocument> doc = do_QueryInterface(domDoc);
  NS_ENSURE_TRUE(doc, nsnull);

  nsCOMPtr<nsIScriptGlobalObject> global;
  doc->GetScriptGlobalObject(getter_AddRefs(global));
  NS_ENSURE_TRUE(global, nsnull);

  nsCOMPtr<nsIDOMWindow> domWindow = do_QueryInterface(global);
  return domWindow;
}

PRInt32
nsFormFillController::GetIndexOfDocShell(nsIDocShell *aDocShell)
{
  // Loop through our cached docShells looking for the given docShell
  PRUint32 count;
  mDocShells->Count(&count);
  for (PRUint32 i = 0; i < count; ++i) {
    nsCOMPtr<nsIDocShell> docShell;
    mDocShells->GetElementAt(i, getter_AddRefs(docShell));
    if (docShell == aDocShell)
      return i;
  }

  // Recursively check the parent docShell of this one
  nsCOMPtr<nsIDocShellTreeItem> treeItem = do_QueryInterface(aDocShell);
  nsCOMPtr<nsIDocShellTreeItem> parentItem;
  treeItem->GetParent(getter_AddRefs(parentItem));
  if (parentItem) {
    nsCOMPtr<nsIDocShell> parentShell = do_QueryInterface(parentItem);
    return GetIndexOfDocShell(parentShell);
  }
    
  return -1;
}

