/* -*- Mode: c++; c-basic-offset: 2; tab-width: 20; indent-tabs-mode: nil; -*-
 * 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 "AndroidContentController.h"

#include "AndroidBridge.h"
#include "base/message_loop.h"
#include "mozilla/layers/APZCCallbackHelper.h"
#include "mozilla/layers/IAPZCTreeManager.h"
#include "nsIObserverService.h"
#include "nsLayoutUtils.h"
#include "nsWindow.h"

using mozilla::layers::IAPZCTreeManager;

namespace mozilla {
namespace widget {

void AndroidContentController::Destroy() {
  mAndroidWindow = nullptr;
  ChromeProcessController::Destroy();
}

void AndroidContentController::UpdateOverscrollVelocity(
    const ScrollableLayerGuid& aGuid, const float aX, const float aY,
    const bool aIsRootContent) {
  if (aIsRootContent && mAndroidWindow) {
    mAndroidWindow->UpdateOverscrollVelocity(aX, aY);
  }
}

void AndroidContentController::UpdateOverscrollOffset(
    const ScrollableLayerGuid& aGuid, const float aX, const float aY,
    const bool aIsRootContent) {
  if (aIsRootContent && mAndroidWindow) {
    mAndroidWindow->UpdateOverscrollOffset(aX, aY);
  }
}

void AndroidContentController::NotifyAPZStateChange(
    const ScrollableLayerGuid& aGuid, APZStateChange aChange, int aArg,
    Maybe<uint64_t> aInputBlockId) {
  // This function may get invoked twice, if the first invocation is not on
  // the main thread then the ChromeProcessController version of this function
  // will redispatch to the main thread. We want to make sure that our handling
  // only happens on the main thread.
  ChromeProcessController::NotifyAPZStateChange(aGuid, aChange, aArg,
                                                aInputBlockId);
  if (NS_IsMainThread()) {
    nsCOMPtr<nsIObserverService> observerService =
        mozilla::services::GetObserverService();
    if (aChange ==
        layers::GeckoContentController::APZStateChange::eTransformEnd) {
      // This is used by tests to determine when the APZ is done doing whatever
      // it's doing. XXX generify this as needed when writing additional tests.
      observerService->NotifyObservers(nullptr, "APZ:TransformEnd", nullptr);
      observerService->NotifyObservers(nullptr, "PanZoom:StateChange",
                                       u"NOTHING");
    } else if (aChange == layers::GeckoContentController::APZStateChange::
                              eTransformBegin) {
      observerService->NotifyObservers(nullptr, "PanZoom:StateChange",
                                       u"PANNING");
    }
  }
}

}  // namespace widget
}  // namespace mozilla