/* -*- Mode: C++; tab-width: 3; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla 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/MPL/
 *
 * 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 the Mozilla browser.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications, Inc.
 * Portions created by the Initial Developer are Copyright (C) 1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   David W. Hyatt <hyatt@netscape.com> (Original Author)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of 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 MPL, 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 MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsCOMPtr.h"
#include "nsWindowRoot.h"
#include "nsIDOMWindow.h"
#include "nsIDOMDocument.h"
#include "nsIDocument.h"
#include "nsIEventListenerManager.h"
#include "nsIPresShell.h"
#include "nsPresContext.h"
#include "nsLayoutCID.h"
#include "nsContentCID.h"
#include "nsIEventStateManager.h"
#include "nsIPrivateDOMEvent.h"
#include "nsIDOMWindowInternal.h"
#include "nsFocusController.h"
#include "nsString.h"

static NS_DEFINE_CID(kEventListenerManagerCID,    NS_EVENTLISTENERMANAGER_CID);

nsWindowRoot::nsWindowRoot(nsIDOMWindow* aWindow)
{
  mWindow = aWindow;

  // Create and init our focus controller.
  nsFocusController::Create(getter_AddRefs(mFocusController));

  nsCOMPtr<nsIDOMFocusListener> focusListener(do_QueryInterface(mFocusController));
  AddEventListener(NS_LITERAL_STRING("focus"), focusListener, PR_TRUE);
  AddEventListener(NS_LITERAL_STRING("blur"), focusListener, PR_TRUE);
}

nsWindowRoot::~nsWindowRoot()
{
}

NS_IMPL_ISUPPORTS6(nsWindowRoot,
                   nsIDOMEventReceiver,
                   nsIChromeEventHandler,
                   nsPIWindowRoot,
                   nsIDOMEventTarget,
                   nsIDOM3EventTarget,
                   nsIDOMNSEventTarget)

NS_IMETHODIMP
nsWindowRoot::AddEventListener(const nsAString& aType, nsIDOMEventListener* aListener, PRBool aUseCapture)
{
  return AddGroupedEventListener(aType, aListener, aUseCapture, nsnull);
}

NS_IMETHODIMP
nsWindowRoot::RemoveEventListener(const nsAString& aType, nsIDOMEventListener* aListener, PRBool aUseCapture)
{
  return RemoveGroupedEventListener(aType, aListener, aUseCapture, nsnull);
}

NS_IMETHODIMP
nsWindowRoot::DispatchEvent(nsIDOMEvent* aEvt, PRBool *_retval)
{
  // Obtain a presentation context
  nsCOMPtr<nsIDOMDocument> domDoc;
  mWindow->GetDocument(getter_AddRefs(domDoc));
  if (!domDoc)
    return NS_OK;
  nsCOMPtr<nsIDocument> doc(do_QueryInterface(domDoc));
  
  PRInt32 count = doc->GetNumberOfShells();
  if (count == 0)
    return NS_OK;

  nsIPresShell *shell = doc->GetShellAt(0);
  
  // Retrieve the context
  nsCOMPtr<nsPresContext> aPresContext = shell->GetPresContext();

  return aPresContext->EventStateManager()->
    DispatchNewEvent(NS_STATIC_CAST(nsIDOMEventReceiver*, this),
                     aEvt, _retval);
}

NS_IMETHODIMP
nsWindowRoot::AddGroupedEventListener(const nsAString & aType, nsIDOMEventListener *aListener, 
                                          PRBool aUseCapture, nsIDOMEventGroup *aEvtGrp)
{
  nsCOMPtr<nsIEventListenerManager> manager;

  if (NS_SUCCEEDED(GetListenerManager(getter_AddRefs(manager)))) {
    PRInt32 flags = aUseCapture ? NS_EVENT_FLAG_CAPTURE : NS_EVENT_FLAG_BUBBLE;
    manager->AddEventListenerByType(aListener, aType, flags, aEvtGrp);
    return NS_OK;
  }
  return NS_ERROR_FAILURE;
}

NS_IMETHODIMP
nsWindowRoot::RemoveGroupedEventListener(const nsAString & aType, nsIDOMEventListener *aListener, 
                                             PRBool aUseCapture, nsIDOMEventGroup *aEvtGrp)
{
  if (mListenerManager) {
    PRInt32 flags = aUseCapture ? NS_EVENT_FLAG_CAPTURE : NS_EVENT_FLAG_BUBBLE;
    mListenerManager->RemoveEventListenerByType(aListener, aType, flags, aEvtGrp);
    return NS_OK;
  }
  return NS_ERROR_FAILURE;
}

NS_IMETHODIMP
nsWindowRoot::CanTrigger(const nsAString & type, PRBool *_retval)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsWindowRoot::IsRegisteredHere(const nsAString & type, PRBool *_retval)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsWindowRoot::AddEventListener(const nsAString& aType,
                               nsIDOMEventListener *aListener,
                               PRBool aUseCapture, PRBool aWantsUntrusted)
{
  nsCOMPtr<nsIEventListenerManager> manager;
  nsresult rv = GetListenerManager(getter_AddRefs(manager));
  NS_ENSURE_SUCCESS(rv, rv);

  PRInt32 flags = aUseCapture ? NS_EVENT_FLAG_CAPTURE : NS_EVENT_FLAG_BUBBLE;

  if (aWantsUntrusted) {
    flags |= NS_PRIV_EVENT_UNTRUSTED_PERMITTED;
  }

  return manager->AddEventListenerByType(aListener, aType, flags, nsnull);
}

NS_IMETHODIMP
nsWindowRoot::AddEventListenerByIID(nsIDOMEventListener *aListener, const nsIID& aIID)
{
  nsCOMPtr<nsIEventListenerManager> manager;
  GetListenerManager(getter_AddRefs(manager));
  if (manager) {
    manager->AddEventListenerByIID(aListener, aIID, NS_EVENT_FLAG_BUBBLE);
    return NS_OK;
  }
  return NS_ERROR_FAILURE;
}
  
NS_IMETHODIMP
nsWindowRoot::RemoveEventListenerByIID(nsIDOMEventListener *aListener, const nsIID& aIID)
{
  nsCOMPtr<nsIEventListenerManager> manager;
  GetListenerManager(getter_AddRefs(manager));
  if (manager) {
    manager->RemoveEventListenerByIID(aListener, aIID, NS_EVENT_FLAG_BUBBLE);
    return NS_OK;
  }
  return NS_ERROR_FAILURE;
}

NS_IMETHODIMP
nsWindowRoot::GetListenerManager(nsIEventListenerManager** aResult)
{
  if (!mListenerManager) {
    nsresult rv;
    mListenerManager = do_CreateInstance(kEventListenerManagerCID, &rv);
    if (NS_FAILED(rv)) return rv;
  }

  *aResult = mListenerManager;
  NS_ADDREF(*aResult);
  return NS_OK;
}

NS_IMETHODIMP
nsWindowRoot::HandleEvent(nsIDOMEvent *aEvent)
{
  PRBool defaultActionEnabled;
  return DispatchEvent(aEvent, &defaultActionEnabled);
}

NS_IMETHODIMP
nsWindowRoot::GetSystemEventGroup(nsIDOMEventGroup **aGroup)
{
  nsCOMPtr<nsIEventListenerManager> manager;
  if (NS_SUCCEEDED(GetListenerManager(getter_AddRefs(manager))) && manager) {
    return manager->GetSystemEventGroupLM(aGroup);
  }
  return NS_ERROR_FAILURE;
}

NS_IMETHODIMP
nsWindowRoot::HandleChromeEvent(nsPresContext* aPresContext, nsEvent* aEvent,
                                nsIDOMEvent** aDOMEvent, PRUint32 aFlags, 
                                nsEventStatus* aEventStatus)
{
  // Make sure to tell the event that dispatch has started.
  NS_MARK_EVENT_DISPATCH_STARTED(aEvent);

  // Prevent the world from going
  // away until after we've finished handling the event.
  nsCOMPtr<nsIDOMWindow> kungFuDeathGrip(mWindow);

  nsresult ret = NS_OK;
  nsIDOMEvent* domEvent = nsnull;

  // We're at the top, so there's no bubbling or capturing here.
  if (NS_EVENT_FLAG_INIT & aFlags) {
    aDOMEvent = &domEvent;
    aEvent->flags = aFlags;
    aFlags &= ~(NS_EVENT_FLAG_CANT_BUBBLE | NS_EVENT_FLAG_CANT_CANCEL);
  }

  //Local handling stage
  if (mListenerManager && !(aEvent->flags & NS_EVENT_FLAG_STOP_DISPATCH)) {
    aEvent->flags |= aFlags;
    mListenerManager->HandleEvent(aPresContext, aEvent, aDOMEvent, this, aFlags, aEventStatus);
    aEvent->flags &= ~aFlags;
  }

  if (NS_EVENT_FLAG_INIT & aFlags) {
    // We're leaving the DOM event loop so if we created a DOM event,
    // release here.
    if (nsnull != *aDOMEvent) {
      nsrefcnt rc;
      NS_RELEASE2(*aDOMEvent, rc);
      if (0 != rc) {
        // Okay, so someone in the DOM loop (a listener, JS object)
        // still has a ref to the DOM Event but the internal data
        // hasn't been malloc'd.  Force a copy of the data here so the
        // DOM Event is still valid.
        nsIPrivateDOMEvent *privateEvent;
        if (NS_OK == (*aDOMEvent)->QueryInterface(NS_GET_IID(nsIPrivateDOMEvent), (void**)&privateEvent)) {
          privateEvent->DuplicatePrivateData();
          NS_RELEASE(privateEvent);
        }
      }
    }
    aDOMEvent = nsnull;

    // Now that we're done with this event, remove the flag that says
    // we're in the process of dispatching this event.
    NS_MARK_EVENT_DISPATCH_DONE(aEvent);
  }

  return ret;
}

NS_IMETHODIMP
nsWindowRoot::GetFocusController(nsIFocusController** aResult)
{
  *aResult = mFocusController;
  NS_IF_ADDREF(*aResult);
  return NS_OK;
}

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

nsresult
NS_NewWindowRoot(nsIDOMWindow* aWindow, nsIChromeEventHandler** aResult)
{
  *aResult = new nsWindowRoot(aWindow);
  if (!*aResult)
    return NS_ERROR_OUT_OF_MEMORY;
  NS_ADDREF(*aResult);
  return NS_OK;
}
