/* ***** 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 DesktopNotification.
 *
 * The Initial Developer of the Original Code is Mozilla Foundation
 * Portions created by the Initial Developer are Copyright (C) 2010
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *  Doug Turner <dougt@dougt.org>  (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 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 "nsDesktopNotification.h"

#include "nsContentPermissionHelper.h"
#include "nsXULAppAPI.h"

#include "mozilla/dom/PBrowserChild.h"
#include "TabChild.h"
#include "mozilla/Preferences.h"

using namespace mozilla;
using namespace mozilla::dom;

/* ------------------------------------------------------------------------ */
/* AlertServiceObserver                                                     */
/* ------------------------------------------------------------------------ */

NS_IMPL_ISUPPORTS1(AlertServiceObserver, nsIObserver)

/* ------------------------------------------------------------------------ */
/* nsDesktopNotification                                                    */
/* ------------------------------------------------------------------------ */

void
nsDOMDesktopNotification::PostDesktopNotification()
{
  nsCOMPtr<nsIAlertsService> alerts = do_GetService("@mozilla.org/alerts-service;1");
  if (!alerts)
    return;

  if (!mObserver)
    mObserver = new AlertServiceObserver(this);

  alerts->ShowAlertNotification(mIconURL, mTitle, mDescription,
                                true, 
                                EmptyString(),
                                mObserver,
                                EmptyString());
}

DOMCI_DATA(DesktopNotification, nsDOMDesktopNotification)

NS_IMPL_CYCLE_COLLECTION_CLASS(nsDOMDesktopNotification)

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(nsDOMDesktopNotification, nsDOMEventTargetHelper)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mOnClickCallback)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mOnCloseCallback)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(nsDOMDesktopNotification, nsDOMEventTargetHelper)
  NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mOnClickCallback)
  NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mOnCloseCallback)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(nsDOMDesktopNotification)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDOMDesktopNotification)
  NS_INTERFACE_MAP_ENTRY(nsIDOMDesktopNotification)
  NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(DesktopNotification)
NS_INTERFACE_MAP_END_INHERITING(nsDOMEventTargetHelper)

NS_IMPL_ADDREF_INHERITED(nsDOMDesktopNotification, nsDOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(nsDOMDesktopNotification, nsDOMEventTargetHelper)

nsDOMDesktopNotification::nsDOMDesktopNotification(const nsAString & title,
                                                   const nsAString & description,
                                                   const nsAString & iconURL,
                                                   nsPIDOMWindow *aWindow,
                                                   nsIScriptContext* aScriptContext,
                                                   nsIURI* uri)
  : mTitle(title)
  , mDescription(description)
  , mIconURL(iconURL)
  , mURI(uri)
  , mAllow(PR_FALSE)
  , mShowHasBeenCalled(PR_FALSE)
{
  mOwner = aWindow;
  mScriptContext = aScriptContext;

  if (Preferences::GetBool("notification.disabled", PR_FALSE)) {
    return;
  }

  // If we are in testing mode (running mochitests, for example)
  // and we are suppose to allow requests, then just post an allow event.
  if (Preferences::GetBool("notification.prompt.testing", PR_FALSE) &&
      Preferences::GetBool("notification.prompt.testing.allow", PR_TRUE)) {
    mAllow = PR_TRUE;
    return;
  }

  nsRefPtr<nsDesktopNotificationRequest> request = new nsDesktopNotificationRequest(this);

  // if we are in the content process, then remote it to the parent.
  if (XRE_GetProcessType() == GeckoProcessType_Content) {

    // if for some reason mOwner is null, just silently
    // bail.  The user will not see a notification, and that
    // is fine.
    if (!mOwner)
      return;

    // because owner implements nsITabChild, we can assume that it is
    // the one and only TabChild for this docshell.
    TabChild* child = GetTabChildFrom(mOwner->GetDocShell());
    
    // Retain a reference so the object isn't deleted without IPDL's knowledge.
    // Corresponding release occurs in DeallocPContentPermissionRequest.
    request->AddRef();

    nsCString type = NS_LITERAL_CSTRING("desktop-notification");
    child->SendPContentPermissionRequestConstructor(request, type, IPC::URI(mURI));
    
    request->Sendprompt();
    return;
  }

  // otherwise, dispatch it
  NS_DispatchToMainThread(request);

}

nsDOMDesktopNotification::~nsDOMDesktopNotification()
{
  if (mObserver) {
    mObserver->Disconnect();
  }
}

void
nsDOMDesktopNotification::DispatchNotificationEvent(const nsString& aName)
{
  if (NS_FAILED(CheckInnerWindowCorrectness())) {
    return;
  }

  nsCOMPtr<nsIDOMEvent> event;
  nsresult rv = NS_NewDOMEvent(getter_AddRefs(event), nsnull, nsnull);
  if (NS_SUCCEEDED(rv)) {
    // it doesn't bubble, and it isn't cancelable
    rv = event->InitEvent(aName, PR_FALSE, PR_FALSE);
    if (NS_SUCCEEDED(rv)) {
      nsCOMPtr<nsIPrivateDOMEvent> privateEvent = do_QueryInterface(event);
      privateEvent->SetTrusted(PR_TRUE);
      DispatchDOMEvent(nsnull, event, nsnull, nsnull);
    }
  }
}

void
nsDOMDesktopNotification::SetAllow(PRBool aAllow)
{
  mAllow = aAllow;

  // if we have called Show() already, lets go ahead and post a notification
  if (mShowHasBeenCalled && aAllow)
    PostDesktopNotification();
}

void
nsDOMDesktopNotification::HandleAlertServiceNotification(const char *aTopic)
{
  if (NS_FAILED(CheckInnerWindowCorrectness()))
    return;

  if (!strcmp("alertclickcallback", aTopic)) {
    DispatchNotificationEvent(NS_LITERAL_STRING("click"));
  } else if (!strcmp("alertfinished", aTopic)) {
    DispatchNotificationEvent(NS_LITERAL_STRING("close"));
  }
}

NS_IMETHODIMP
nsDOMDesktopNotification::Show()
{
  mShowHasBeenCalled = PR_TRUE;

  if (!mAllow)
    return NS_OK;

  PostDesktopNotification();
  return NS_OK;
}

NS_IMETHODIMP
nsDOMDesktopNotification::GetOnclick(nsIDOMEventListener * *aOnclick)
{
  return GetInnerEventListener(mOnClickCallback, aOnclick);
}

NS_IMETHODIMP nsDOMDesktopNotification::SetOnclick(nsIDOMEventListener * aOnclick)
{
  return RemoveAddEventListener(NS_LITERAL_STRING("click"),
                                mOnClickCallback,
                                aOnclick);
}

NS_IMETHODIMP
nsDOMDesktopNotification::GetOnclose(nsIDOMEventListener * *aOnclose)
{
  return GetInnerEventListener(mOnCloseCallback, aOnclose);
}

NS_IMETHODIMP nsDOMDesktopNotification::SetOnclose(nsIDOMEventListener * aOnclose)
{
  return RemoveAddEventListener(NS_LITERAL_STRING("close"),
                                mOnCloseCallback,
                                aOnclose);
}

/* ------------------------------------------------------------------------ */
/* nsDesktopNotificationCenter                                              */
/* ------------------------------------------------------------------------ */

DOMCI_DATA(DesktopNotificationCenter, nsDesktopNotificationCenter)

NS_INTERFACE_MAP_BEGIN(nsDesktopNotificationCenter)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDOMDesktopNotificationCenter)
  NS_INTERFACE_MAP_ENTRY(nsIDOMDesktopNotificationCenter)
  NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(DesktopNotificationCenter)
NS_INTERFACE_MAP_END

NS_IMPL_ADDREF(nsDesktopNotificationCenter)
NS_IMPL_RELEASE(nsDesktopNotificationCenter)

NS_IMETHODIMP
nsDesktopNotificationCenter::CreateNotification(const nsAString & title,
                                                const nsAString & description,
                                                const nsAString & iconURL,
                                                nsIDOMDesktopNotification **aResult)
{
  nsRefPtr<nsIDOMDesktopNotification> notification = new nsDOMDesktopNotification(title, 
                                                                                  description,
                                                                                  iconURL,
                                                                                  mOwner,
                                                                                  mScriptContext,
                                                                                  mURI);
  notification.forget(aResult);
  return NS_OK;
}


/* ------------------------------------------------------------------------ */
/* nsDesktopNotificationRequest                                             */
/* ------------------------------------------------------------------------ */

NS_IMPL_ISUPPORTS2(nsDesktopNotificationRequest,
                   nsIContentPermissionRequest,
                   nsIRunnable)

NS_IMETHODIMP
nsDesktopNotificationRequest::GetUri(nsIURI * *aRequestingURI)
{
  if (!mDesktopNotification)
    return NS_ERROR_NOT_INITIALIZED;

  NS_IF_ADDREF(*aRequestingURI = mDesktopNotification->mURI);
  return NS_OK;
}

NS_IMETHODIMP
nsDesktopNotificationRequest::GetWindow(nsIDOMWindow * *aRequestingWindow)
{
  if (!mDesktopNotification)
    return NS_ERROR_NOT_INITIALIZED;

  nsCOMPtr<nsIDOMWindow> window = do_QueryInterface(mDesktopNotification->mOwner);
  NS_IF_ADDREF(*aRequestingWindow = window);
  return NS_OK;
}

NS_IMETHODIMP
nsDesktopNotificationRequest::GetElement(nsIDOMElement * *aElement)
{
  return NS_ERROR_FAILURE;
}

NS_IMETHODIMP
nsDesktopNotificationRequest::Cancel()
{
  mDesktopNotification->SetAllow(PR_FALSE);
  mDesktopNotification = nsnull;
  return NS_OK;
}

NS_IMETHODIMP
nsDesktopNotificationRequest::Allow()
{
  mDesktopNotification->SetAllow(PR_TRUE);
  mDesktopNotification = nsnull;
  return NS_OK;
}

NS_IMETHODIMP
nsDesktopNotificationRequest::GetType(nsACString & aType)
{
  aType = "desktop-notification";
  return NS_OK;
}

