/*
 *  Copyright (c) 2012 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 WEBRTC_CALL_CONGESTION_CONTROLLER_H_
#define WEBRTC_CALL_CONGESTION_CONTROLLER_H_

#include <vector>

#include "webrtc/base/criticalsection.h"
#include "webrtc/base/scoped_ptr.h"
#include "webrtc/base/socket.h"
#include "webrtc/modules/bitrate_controller/include/bitrate_controller.h"
#include "webrtc/stream.h"

namespace webrtc {

class BitrateAllocator;
class CallStats;
class Config;
class PacedSender;
class PacketRouter;
class ProcessThread;
class RemoteBitrateEstimator;
class RemoteEstimatorProxy;
class RtpRtcp;
class SendStatisticsProxy;
class TransportFeedbackAdapter;
class ViEEncoder;
class VieRemb;

class CongestionController : public BitrateObserver {
 public:
  CongestionController(ProcessThread* process_thread, CallStats* call_stats);
  ~CongestionController();
  void AddEncoder(ViEEncoder* encoder);
  void RemoveEncoder(ViEEncoder* encoder);
  void SetBweBitrates(int min_bitrate_bps,
                      int start_bitrate_bps,
                      int max_bitrate_bps);

  void SetChannelRembStatus(bool sender, bool receiver, RtpRtcp* rtp_module);

  void SignalNetworkState(NetworkState state);

  BitrateController* GetBitrateController() const;
  RemoteBitrateEstimator* GetRemoteBitrateEstimator(bool send_side_bwe) const;
  int64_t GetPacerQueuingDelayMs() const;
  PacedSender* pacer() const { return pacer_.get(); }
  PacketRouter* packet_router() const { return packet_router_.get(); }
  BitrateAllocator* bitrate_allocator() const {
      return bitrate_allocator_.get(); }
  TransportFeedbackObserver* GetTransportFeedbackObserver();

  // Implements BitrateObserver.
  void OnNetworkChanged(uint32_t target_bitrate_bps,
                        uint8_t fraction_loss,
                        int64_t rtt) override;

  void OnSentPacket(const rtc::SentPacket& sent_packet);

 private:
  rtc::scoped_ptr<VieRemb> remb_;
  // TODO(mflodman): Move bitrate_allocator_ to Call.
  rtc::scoped_ptr<BitrateAllocator> bitrate_allocator_;
  rtc::scoped_ptr<PacketRouter> packet_router_;
  rtc::scoped_ptr<PacedSender> pacer_;
  rtc::scoped_ptr<RemoteBitrateEstimator> remote_bitrate_estimator_;
  rtc::scoped_ptr<RemoteEstimatorProxy> remote_estimator_proxy_;

  mutable rtc::CriticalSection encoder_crit_;
  std::vector<ViEEncoder*> encoders_ GUARDED_BY(encoder_crit_);

  // Registered at construct time and assumed to outlive this class.
  ProcessThread* const process_thread_;
  CallStats* const call_stats_;

  rtc::scoped_ptr<ProcessThread> pacer_thread_;

  rtc::scoped_ptr<BitrateController> bitrate_controller_;
  rtc::scoped_ptr<TransportFeedbackAdapter> transport_feedback_adapter_;
  int min_bitrate_bps_;
};

}  // namespace webrtc

#endif  // WEBRTC_CALL_CONGESTION_CONTROLLER_H_