/* -*- Mode: C++; tab-width: 2; indent-tabs-mode:nil; c-basic-offset: 2 -*- */
/* 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/. */

#include "mozilla/dom/ContentChild.h"
#include "nsXULAppAPI.h"

#include "nsAlertsService.h"

#ifdef MOZ_WIDGET_ANDROID
#include "AndroidBridge.h"
#else

#include "nsISupportsArray.h"
#include "nsXPCOM.h"
#include "nsISupportsPrimitives.h"
#include "nsIServiceManager.h"
#include "nsIDOMWindow.h"
#include "nsIWindowWatcher.h"
#include "nsPromiseFlatString.h"
#include "nsToolkitCompsCID.h"
#include "mozilla/LookAndFeel.h"

#define ALERT_CHROME_URL "chrome://global/content/alerts/alert.xul"

#endif // !MOZ_WIDGET_ANDROID

using namespace mozilla;

using mozilla::dom::ContentChild;

NS_IMPL_THREADSAFE_ISUPPORTS2(nsAlertsService, nsIAlertsService, nsIAlertsProgressListener)

nsAlertsService::nsAlertsService()
{
}

nsAlertsService::~nsAlertsService()
{}

bool nsAlertsService::ShouldShowAlert()
{
  bool result = true;

#ifdef XP_WIN
  HMODULE shellDLL = ::LoadLibraryW(L"shell32.dll");
  if (!shellDLL)
    return result;

  SHQueryUserNotificationStatePtr pSHQueryUserNotificationState =
    (SHQueryUserNotificationStatePtr) ::GetProcAddress(shellDLL, "SHQueryUserNotificationState");

  if (pSHQueryUserNotificationState) {
    MOZ_QUERY_USER_NOTIFICATION_STATE qstate;
    if (SUCCEEDED(pSHQueryUserNotificationState(&qstate))) {
      if (qstate != QUNS_ACCEPTS_NOTIFICATIONS) {
         result = false;
      }
    }
  }

  ::FreeLibrary(shellDLL);
#endif

  return result;
}

NS_IMETHODIMP nsAlertsService::ShowAlertNotification(const nsAString & aImageUrl, const nsAString & aAlertTitle, 
                                                     const nsAString & aAlertText, bool aAlertTextClickable,
                                                     const nsAString & aAlertCookie,
                                                     nsIObserver * aAlertListener,
                                                     const nsAString & aAlertName)
{
  if (XRE_GetProcessType() == GeckoProcessType_Content) {
    ContentChild* cpc = ContentChild::GetSingleton();

    if (aAlertListener)
      cpc->AddRemoteAlertObserver(PromiseFlatString(aAlertCookie), aAlertListener);

    cpc->SendShowAlertNotification(nsAutoString(aImageUrl),
                                   nsAutoString(aAlertTitle),
                                   nsAutoString(aAlertText),
                                   aAlertTextClickable,
                                   nsAutoString(aAlertCookie),
                                   nsAutoString(aAlertName));
    return NS_OK;
  }

#ifdef MOZ_WIDGET_ANDROID
  mozilla::AndroidBridge::Bridge()->ShowAlertNotification(aImageUrl, aAlertTitle, aAlertText, aAlertCookie,
                                                          aAlertListener, aAlertName);
  return NS_OK;
#else
  // Check if there is an optional service that handles system-level notifications
  nsCOMPtr<nsIAlertsService> sysAlerts(do_GetService(NS_SYSTEMALERTSERVICE_CONTRACTID));
  nsresult rv;
  if (sysAlerts) {
    rv = sysAlerts->ShowAlertNotification(aImageUrl, aAlertTitle, aAlertText, aAlertTextClickable,
                                          aAlertCookie, aAlertListener, aAlertName);
    if (NS_SUCCEEDED(rv))
      return rv;
  }

  if (!ShouldShowAlert()) {
    // Do not display the alert. Instead call alertfinished and get out.
    if (aAlertListener)
      aAlertListener->Observe(NULL, "alertfinished", PromiseFlatString(aAlertCookie).get());
    return NS_OK;
  }

#ifdef XP_MACOSX
  return NS_ERROR_NOT_IMPLEMENTED;
#endif

  nsCOMPtr<nsIWindowWatcher> wwatch(do_GetService(NS_WINDOWWATCHER_CONTRACTID));
  nsCOMPtr<nsIDOMWindow> newWindow;

  nsCOMPtr<nsISupportsArray> argsArray;
  rv = NS_NewISupportsArray(getter_AddRefs(argsArray));
  NS_ENSURE_SUCCESS(rv, rv);

  // create scriptable versions of our strings that we can store in our nsISupportsArray....
  nsCOMPtr<nsISupportsString> scriptableImageUrl (do_CreateInstance(NS_SUPPORTS_STRING_CONTRACTID));
  NS_ENSURE_TRUE(scriptableImageUrl, NS_ERROR_FAILURE);

  scriptableImageUrl->SetData(aImageUrl);
  rv = argsArray->AppendElement(scriptableImageUrl);
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsISupportsString> scriptableAlertTitle (do_CreateInstance(NS_SUPPORTS_STRING_CONTRACTID));
  NS_ENSURE_TRUE(scriptableAlertTitle, NS_ERROR_FAILURE);

  scriptableAlertTitle->SetData(aAlertTitle);
  rv = argsArray->AppendElement(scriptableAlertTitle);
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsISupportsString> scriptableAlertText (do_CreateInstance(NS_SUPPORTS_STRING_CONTRACTID));
  NS_ENSURE_TRUE(scriptableAlertText, NS_ERROR_FAILURE);

  scriptableAlertText->SetData(aAlertText);
  rv = argsArray->AppendElement(scriptableAlertText);
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsISupportsPRBool> scriptableIsClickable (do_CreateInstance(NS_SUPPORTS_PRBOOL_CONTRACTID));
  NS_ENSURE_TRUE(scriptableIsClickable, NS_ERROR_FAILURE);

  scriptableIsClickable->SetData(aAlertTextClickable);
  rv = argsArray->AppendElement(scriptableIsClickable);
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsISupportsString> scriptableAlertCookie (do_CreateInstance(NS_SUPPORTS_STRING_CONTRACTID));
  NS_ENSURE_TRUE(scriptableAlertCookie, NS_ERROR_FAILURE);

  scriptableAlertCookie->SetData(aAlertCookie);
  rv = argsArray->AppendElement(scriptableAlertCookie);
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsISupportsPRInt32> scriptableOrigin (do_CreateInstance(NS_SUPPORTS_PRINT32_CONTRACTID));
  NS_ENSURE_TRUE(scriptableOrigin, NS_ERROR_FAILURE);

  int32_t origin =
    LookAndFeel::GetInt(LookAndFeel::eIntID_AlertNotificationOrigin);
  scriptableOrigin->SetData(origin);

  rv = argsArray->AppendElement(scriptableOrigin);
  NS_ENSURE_SUCCESS(rv, rv);

  if (aAlertListener)
  {
    nsCOMPtr<nsISupportsInterfacePointer> ifptr = do_CreateInstance(NS_SUPPORTS_INTERFACE_POINTER_CONTRACTID, &rv);
    NS_ENSURE_SUCCESS(rv, rv);

    nsCOMPtr<nsISupports> iSupports (do_QueryInterface(aAlertListener));
    ifptr->SetData(iSupports);
    ifptr->SetDataIID(&NS_GET_IID(nsIObserver));
    rv = argsArray->AppendElement(ifptr);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  rv = wwatch->OpenWindow(0, ALERT_CHROME_URL, "_blank",
                 "chrome,dialog=yes,titlebar=no,popup=yes", argsArray,
                 getter_AddRefs(newWindow));
  return rv;
#endif // !MOZ_WIDGET_ANDROID
}

NS_IMETHODIMP nsAlertsService::OnProgress(const nsAString & aAlertName,
                                          int64_t aProgress,
                                          int64_t aProgressMax,
                                          const nsAString & aAlertText)
{
#ifdef MOZ_WIDGET_ANDROID
  mozilla::AndroidBridge::Bridge()->AlertsProgressListener_OnProgress(aAlertName, aProgress, aProgressMax, aAlertText);
  return NS_OK;
#else
  return NS_ERROR_NOT_IMPLEMENTED;
#endif // !MOZ_WIDGET_ANDROID
}

NS_IMETHODIMP nsAlertsService::OnCancel(const nsAString & aAlertName)
{
#ifdef MOZ_WIDGET_ANDROID
  mozilla::AndroidBridge::Bridge()->AlertsProgressListener_OnCancel(aAlertName);
  return NS_OK;
#else
  return NS_ERROR_NOT_IMPLEMENTED;
#endif // !MOZ_WIDGET_ANDROID
}