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+/*
+ *  Copyright (c) 2019 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 TEST_PEER_SCENARIO_PEER_SCENARIO_H_
+#define TEST_PEER_SCENARIO_PEER_SCENARIO_H_
+
+// The peer connection scenario test framework enables writing end to end unit
+// tests on the peer connection level. It's similar to the Scenario test but
+// uses the full stack, including SDP and ICE negotiation. This ensures that
+// features work end to end. It's also diffferent from the other tests on peer
+// connection level in that it does not rely on any mocks or fakes other than
+// for media input and networking. Additionally it provides direct access to the
+// underlying peer connection class.
+
+#include <list>
+#include <vector>
+
+#include "api/test/time_controller.h"
+#include "test/gtest.h"
+#include "test/logging/log_writer.h"
+#include "test/network/network_emulation_manager.h"
+#include "test/peer_scenario/peer_scenario_client.h"
+#include "test/peer_scenario/signaling_route.h"
+#include "test/scenario/stats_collection.h"
+#include "test/scenario/video_frame_matcher.h"
+
+namespace webrtc {
+namespace test {
+// The PeerScenario class represents a PeerConnection simulation scenario. The
+// main purpose is to maintain ownership and ensure safe destruction order of
+// clients and network emulation. Additionally it reduces the amount of boiler
+// plate requited for some actions. For example usage see the existing tests
+// using this class. Note that it should be used from a single calling thread.
+// This thread will also be assigned as the signaling thread for all peer
+// connections that are created. This means that the process methods must be
+// used when waiting to ensure that messages are processed on the signaling
+// thread.
+class PeerScenario {
+ public:
+  // The name is used for log output when those are enabled by the --peer_logs
+  // command line flag. Optionally, the TestInfo struct available in gtest can
+  // be used to automatically generate a path based on the test name.
+  explicit PeerScenario(const testing::TestInfo& test_info,
+                        TimeMode mode = TimeMode::kSimulated);
+  explicit PeerScenario(std::string file_name,
+                        TimeMode mode = TimeMode::kSimulated);
+  explicit PeerScenario(
+      std::unique_ptr<LogWriterFactoryInterface> log_writer_manager,
+      TimeMode mode = TimeMode::kSimulated);
+
+  NetworkEmulationManagerImpl* net() { return &net_; }
+
+  // Creates a client wrapping a peer connection conforming to the given config.
+  // The client  will share the signaling thread with the scenario. To maintain
+  // control of destruction order, ownership is kept within the scenario.
+  PeerScenarioClient* CreateClient(PeerScenarioClient::Config config);
+  PeerScenarioClient* CreateClient(std::string name,
+                                   PeerScenarioClient::Config config);
+
+  // Sets up a signaling route that can be used for SDP and ICE.
+  SignalingRoute ConnectSignaling(PeerScenarioClient* caller,
+                                  PeerScenarioClient* callee,
+                                  std::vector<EmulatedNetworkNode*> send_link,
+                                  std::vector<EmulatedNetworkNode*> ret_link);
+
+  // Connects two clients over given links. This will also start ICE signaling
+  // and SDP negotiation with default behavior. For customized behavior,
+  // ConnectSignaling should be used to allow more detailed control, for
+  // instance to allow different signaling and media routes.
+  void SimpleConnection(PeerScenarioClient* caller,
+                        PeerScenarioClient* callee,
+                        std::vector<EmulatedNetworkNode*> send_link,
+                        std::vector<EmulatedNetworkNode*> ret_link);
+
+  // Starts feeding the results of comparing captured frames from `send_track`
+  // with decoded frames on `receiver` to `analyzer`.
+  // TODO(srte): Provide a way to detach to allow removal of tracks.
+  void AttachVideoQualityAnalyzer(VideoQualityAnalyzer* analyzer,
+                                  VideoTrackInterface* send_track,
+                                  PeerScenarioClient* receiver);
+
+  // Waits on `event` while processing messages on the signaling thread.
+  bool WaitAndProcess(std::atomic<bool>* event,
+                      TimeDelta max_duration = TimeDelta::Seconds(5));
+
+  // Process messages on the signaling thread for the given duration.
+  void ProcessMessages(TimeDelta duration);
+
+ private:
+  // Helper struct to maintain ownership of the matcher and taps.
+  struct PeerVideoQualityPair {
+   public:
+    PeerVideoQualityPair(Clock* capture_clock, VideoQualityAnalyzer* analyzer)
+        : matcher_({analyzer->Handler()}),
+          capture_tap_(capture_clock, &matcher_),
+          decode_tap_(capture_clock, &matcher_, 0) {}
+    VideoFrameMatcher matcher_;
+    CapturedFrameTap capture_tap_;
+    DecodedFrameTap decode_tap_;
+  };
+
+  Clock* clock() { return Clock::GetRealTimeClock(); }
+
+  std::unique_ptr<LogWriterFactoryInterface> GetLogWriterFactory(
+      std::string name);
+
+  const std::unique_ptr<LogWriterFactoryInterface> log_writer_manager_;
+  NetworkEmulationManagerImpl net_;
+  rtc::Thread* const signaling_thread_;
+  std::list<PeerVideoQualityPair> video_quality_pairs_;
+  std::list<PeerScenarioClient> peer_clients_;
+};
+
+}  // namespace test
+}  // namespace webrtc
+#endif  // TEST_PEER_SCENARIO_PEER_SCENARIO_H_