/* 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/. */

#ifndef mozilla_dom_WorkerTestUtils_
#define mozilla_dom_WorkerTestUtils_

#include "nsStringFwd.h"

namespace mozilla {

class ErrorResult;

namespace dom {

class GlobalObject;
class WorkerTestCallback;

/**
 * dom/webidl/WorkerTestUtils.webidl defines APIs to expose worker's internal
 * status for glass-box testing. The APIs are only exposed to Workers with prefs
 * dom.workers.testing.enabled.
 *
 * WorkerTestUtils is the implementation of dom/webidl/WorkerTestUtils.webidl
 */
class WorkerTestUtils final {
 public:
  /**
   *  Expose the worker's current timer nesting level.
   *
   *  The worker's current timer nesting level means the executing timer
   *  handler's timer nesting level. When there is no executing timer handler, 0
   *  should be returned by this API. The maximum timer nesting level is 5.
   *
   *  https://html.spec.whatwg.org/#timer-initialisation-steps
   */
  static uint32_t CurrentTimerNestingLevel(const GlobalObject&,
                                           ErrorResult& aErr);

  static bool IsRunningInBackground(const GlobalObject&, ErrorResult& aErr);

  static void HoldStrongWorkerRefUntilMainThreadObserverNotified(
      const GlobalObject&, const nsACString& aTopic, ErrorResult& aErr);

  MOZ_CAN_RUN_SCRIPT static void BlockUntilMainThreadObserverNotified(
      const GlobalObject&, const nsACString& aTopic,
      WorkerTestCallback& aWhenObserving, ErrorResult& aErr);

  static void NotifyObserverOnMainThread(const GlobalObject&,
                                         const nsACString& aTopic,
                                         ErrorResult& aErr);
};

}  // namespace dom
}  // namespace mozilla
#endif