/* -*- 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):
 * Original Author: David W. Hyatt (hyatt@netscape.com)
 *  - Mike Pinkerton (pinkerton@netscape.com)
 *
 *
 * 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 "nsCOMPtr.h"
#include "nsIXBLPrototypeHandler.h"
#include "nsXBLWindowKeyHandler.h"
#include "nsIContent.h"
#include "nsIAtom.h"
#include "nsIDOMNSUIEvent.h"
#include "nsIDOMKeyEvent.h"
#include "nsIDOMEventReceiver.h"
#include "nsIPrivateDOMEvent.h"
#include "nsXBLService.h"
#include "nsIServiceManager.h"
#include "nsHTMLAtoms.h"
#include "nsINameSpaceManager.h"
#include "nsIXBLDocumentInfo.h"
#include "nsIScriptGlobalObject.h"
#include "nsIDOMElement.h"
#include "nsXBLAtoms.h"

PRUint32 nsXBLWindowKeyHandler::gRefCnt = 0;
nsIAtom* nsXBLWindowKeyHandler::kKeyDownAtom = nsnull;
nsIAtom* nsXBLWindowKeyHandler::kKeyUpAtom = nsnull;
nsIAtom* nsXBLWindowKeyHandler::kKeyPressAtom = nsnull;


nsXBLWindowKeyHandler::nsXBLWindowKeyHandler(nsIDOMElement* aElement, nsIDOMEventReceiver* aReceiver)
  : nsXBLWindowHandler(aElement, aReceiver)
{
  NS_INIT_ISUPPORTS();

  gRefCnt++;
  if (gRefCnt == 1) {
    kKeyUpAtom = NS_NewAtom("keyup");
    kKeyDownAtom = NS_NewAtom("keydown");
    kKeyPressAtom = NS_NewAtom("keypress");
  }
}

nsXBLWindowKeyHandler::~nsXBLWindowKeyHandler()
{
  gRefCnt--;
  if (gRefCnt == 0) {
    NS_RELEASE(kKeyUpAtom);
    NS_RELEASE(kKeyDownAtom);
    NS_RELEASE(kKeyPressAtom);
  }
}

NS_IMPL_ISUPPORTS1(nsXBLWindowKeyHandler, nsIDOMKeyListener)

static void
BuildHandlerChain(nsIContent* aContent, nsIXBLPrototypeHandler** aResult)
{
  nsCOMPtr<nsIXBLPrototypeHandler> firstHandler;
  nsCOMPtr<nsIXBLPrototypeHandler> currHandler;
  
  PRInt32 handlerCount;
  aContent->ChildCount(handlerCount);
  for (PRInt32 j = 0; j < handlerCount; j++) {
    nsCOMPtr<nsIContent> handler;
    aContent->ChildAt(j, *getter_AddRefs(handler));
    
    nsCOMPtr<nsIXBLPrototypeHandler> newHandler;
    NS_NewXULKeyHandler(handler, getter_AddRefs(newHandler));
    
    if (newHandler) {
      if (currHandler)
        currHandler->SetNextHandler(newHandler);
      else firstHandler = newHandler;
      currHandler = newHandler;
    }
  }

  *aResult = firstHandler;
  NS_IF_ADDREF(*aResult);
}

//
// EnsureHandlers
//    
// Lazily load the XBL handlers. Overridden to handle being attached
// to a particular element rather than the document
//
nsresult
nsXBLWindowKeyHandler::EnsureHandlers()
{
  if (mElement) {
    // We are actually a XUL <keyset>.
    if (mHandler)
      return NS_OK;
    nsCOMPtr<nsIContent> content(do_QueryInterface(mElement));
    BuildHandlerChain(content, getter_AddRefs(mHandler));
  }
  else // We are an XBL file of handlers.
    nsXBLWindowHandler::EnsureHandlers();
  
  return NS_OK;
}


NS_IMETHODIMP
nsXBLWindowKeyHandler::WalkHandlers(nsIDOMEvent* aKeyEvent, nsIAtom* aEventType)
{
  nsCOMPtr<nsIDOMNSUIEvent> evt = do_QueryInterface(aKeyEvent);
  PRBool prevent;
  evt->GetPreventDefault(&prevent);
  if (prevent)
    return NS_OK;

  nsCOMPtr<nsIPrivateDOMEvent> privateEvent = do_QueryInterface(aKeyEvent);
  if (privateEvent) {
    //Don't process the event if it was not dispatched from a trusted source
    PRBool trustedEvent;
    privateEvent->IsTrustedEvent(&trustedEvent);
    if (!trustedEvent)
      return NS_OK;    
  }

  // Make sure our event is really a key event
  nsCOMPtr<nsIDOMKeyEvent> keyEvent(do_QueryInterface(aKeyEvent));
  if (!keyEvent)
    return NS_OK;

  EnsureHandlers();
  
  if (!mElement) {
    if (mUserHandler) {
      WalkHandlersInternal(aKeyEvent, aEventType, mUserHandler);
      evt->GetPreventDefault(&prevent);
      if (prevent)
        return NS_OK; // Handled by the platform. Our work here is done.
    }

    if (mPlatformHandler) {
      WalkHandlersInternal(aKeyEvent, aEventType, mPlatformHandler);
      evt->GetPreventDefault(&prevent);
      if (prevent)
        return NS_OK; // Handled by the platform. Our work here is done.
    }
  }

  WalkHandlersInternal(aKeyEvent, aEventType, mHandler);
  
  return NS_OK;
}

nsresult nsXBLWindowKeyHandler::KeyUp(nsIDOMEvent* aKeyEvent)
{
  return WalkHandlers(aKeyEvent, kKeyUpAtom);
}

nsresult nsXBLWindowKeyHandler::KeyDown(nsIDOMEvent* aKeyEvent)
{
  return WalkHandlers(aKeyEvent, kKeyDownAtom);
}

nsresult nsXBLWindowKeyHandler::KeyPress(nsIDOMEvent* aKeyEvent)
{
  return WalkHandlers(aKeyEvent, kKeyPressAtom);
}


//
// EventMatched
//
// See if the given handler cares about this particular key event
//
PRBool
nsXBLWindowKeyHandler :: EventMatched ( nsIXBLPrototypeHandler* inHandler, nsIAtom* inEventType, nsIDOMEvent* inEvent )
{
  PRBool matched = PR_FALSE;
  
  nsCOMPtr<nsIDOMKeyEvent> keyEvent ( do_QueryInterface(inEvent) );
  if ( keyEvent )
    inHandler->KeyEventMatched(inEventType, keyEvent, &matched);
  
  return matched;
}

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

nsresult
NS_NewXBLWindowKeyHandler(nsIDOMElement* aElement, nsIDOMEventReceiver* aReceiver, nsXBLWindowKeyHandler** aResult)
{
  *aResult = new nsXBLWindowKeyHandler(aElement, aReceiver);
  if (!*aResult)
    return NS_ERROR_OUT_OF_MEMORY;
  NS_ADDREF(*aResult);
  return NS_OK;
}