/*
 *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef CALL_SIMULATED_PACKET_RECEIVER_H_
#define CALL_SIMULATED_PACKET_RECEIVER_H_

#include <cstdint>
#include <optional>

#include "call/packet_receiver.h"

namespace webrtc {

// Private API that is fixing surface between DirectTransport and underlying
// network conditions simulation implementation.
class SimulatedPacketReceiverInterface : public PacketReceiver {
 public:
  // Must not be called in parallel with DeliverPacket or Process.
  // Destination receiver will be injected with this method
  virtual void SetReceiver(PacketReceiver* receiver) = 0;

  // Reports average packet delay.
  virtual int AverageDelay() = 0;

  // Process any pending tasks such as timeouts.
  // Called on a worker thread.
  virtual void Process() = 0;

  // Returns the time until next process or nullopt to indicate that the next
  // process time is unknown. If the next process time is unknown, this should
  // be checked again any time a packet is enqueued.
  virtual std::optional<int64_t> TimeUntilNextProcess() = 0;
};

}  // namespace webrtc

#endif  // CALL_SIMULATED_PACKET_RECEIVER_H_