/*
 *  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.
 */

#include "video/encoder_rtcp_feedback.h"

#include <cstdint>
#include <vector>

#include "api/environment/environment_factory.h"
#include "api/video/video_frame_type.h"
#include "system_wrappers/include/clock.h"
#include "test/gmock.h"
#include "test/gtest.h"
#include "video/test/mock_video_stream_encoder.h"

using ::testing::_;
using ::testing::ElementsAre;

namespace webrtc {

class VideoEncoderFeedbackKeyframeTestBase : public ::testing::Test {
 public:
  VideoEncoderFeedbackKeyframeTestBase(bool per_layer_pli_handling,
                                       std::vector<uint32_t> ssrcs)
      : simulated_clock_(123456789),
        encoder_(),
        encoder_rtcp_feedback_(CreateEnvironment(&simulated_clock_),
                               per_layer_pli_handling,
                               ssrcs,
                               &encoder_,
                               nullptr) {}

 protected:
  static const uint32_t kSsrc = 1234;
  static const uint32_t kOtherSsrc = 4321;

  SimulatedClock simulated_clock_;
  ::testing::StrictMock<MockVideoStreamEncoder> encoder_;
  EncoderRtcpFeedback encoder_rtcp_feedback_;
};

class VideoEncoderFeedbackKeyframeTest
    : public VideoEncoderFeedbackKeyframeTestBase {
 public:
  VideoEncoderFeedbackKeyframeTest()
      : VideoEncoderFeedbackKeyframeTestBase(
            /*per_layer_pli_handling=*/false,
            {VideoEncoderFeedbackKeyframeTestBase::kSsrc}) {}
};

TEST_F(VideoEncoderFeedbackKeyframeTest, CreateAndTriggerRequests) {
  EXPECT_CALL(encoder_, SendKeyFrame(_)).Times(1);
  encoder_rtcp_feedback_.OnReceivedIntraFrameRequest(kSsrc);
}

TEST_F(VideoEncoderFeedbackKeyframeTest, TooManyOnReceivedIntraFrameRequest) {
  EXPECT_CALL(encoder_, SendKeyFrame(_)).Times(1);
  encoder_rtcp_feedback_.OnReceivedIntraFrameRequest(kSsrc);
  encoder_rtcp_feedback_.OnReceivedIntraFrameRequest(kSsrc);
  simulated_clock_.AdvanceTimeMilliseconds(10);
  encoder_rtcp_feedback_.OnReceivedIntraFrameRequest(kSsrc);

  EXPECT_CALL(encoder_, SendKeyFrame(_)).Times(1);
  simulated_clock_.AdvanceTimeMilliseconds(300);
  encoder_rtcp_feedback_.OnReceivedIntraFrameRequest(kSsrc);
  encoder_rtcp_feedback_.OnReceivedIntraFrameRequest(kSsrc);
  encoder_rtcp_feedback_.OnReceivedIntraFrameRequest(kSsrc);
}

class VideoEncoderFeedbackKeyframePerLayerPliTest
    : public VideoEncoderFeedbackKeyframeTestBase {
 public:
  VideoEncoderFeedbackKeyframePerLayerPliTest()
      : VideoEncoderFeedbackKeyframeTestBase(
            /*per_layer_pli_handling=*/true,
            {VideoEncoderFeedbackKeyframeTestBase::kSsrc,
             VideoEncoderFeedbackKeyframeTestBase::kOtherSsrc}) {}
};

TEST_F(VideoEncoderFeedbackKeyframePerLayerPliTest, CreateAndTriggerRequests) {
  EXPECT_CALL(encoder_,
              SendKeyFrame(ElementsAre(VideoFrameType::kVideoFrameKey,
                                       VideoFrameType::kVideoFrameDelta)))
      .Times(1);
  EXPECT_CALL(encoder_,
              SendKeyFrame(ElementsAre(VideoFrameType::kVideoFrameDelta,
                                       VideoFrameType::kVideoFrameKey)))
      .Times(1);
  encoder_rtcp_feedback_.OnReceivedIntraFrameRequest(kSsrc);
  encoder_rtcp_feedback_.OnReceivedIntraFrameRequest(kOtherSsrc);
}

TEST_F(VideoEncoderFeedbackKeyframePerLayerPliTest,
       TooManyOnReceivedIntraFrameRequest) {
  EXPECT_CALL(encoder_,
              SendKeyFrame(ElementsAre(VideoFrameType::kVideoFrameKey,
                                       VideoFrameType::kVideoFrameDelta)))
      .Times(1);
  EXPECT_CALL(encoder_,
              SendKeyFrame(ElementsAre(VideoFrameType::kVideoFrameDelta,
                                       VideoFrameType::kVideoFrameKey)))
      .Times(1);
  encoder_rtcp_feedback_.OnReceivedIntraFrameRequest(kSsrc);
  encoder_rtcp_feedback_.OnReceivedIntraFrameRequest(kSsrc);
  encoder_rtcp_feedback_.OnReceivedIntraFrameRequest(kOtherSsrc);
  simulated_clock_.AdvanceTimeMilliseconds(10);
  encoder_rtcp_feedback_.OnReceivedIntraFrameRequest(kSsrc);
  encoder_rtcp_feedback_.OnReceivedIntraFrameRequest(kOtherSsrc);

  EXPECT_CALL(encoder_,
              SendKeyFrame(ElementsAre(VideoFrameType::kVideoFrameKey,
                                       VideoFrameType::kVideoFrameDelta)))
      .Times(1);
  EXPECT_CALL(encoder_,
              SendKeyFrame(ElementsAre(VideoFrameType::kVideoFrameDelta,
                                       VideoFrameType::kVideoFrameKey)))
      .Times(1);
  simulated_clock_.AdvanceTimeMilliseconds(300);
  encoder_rtcp_feedback_.OnReceivedIntraFrameRequest(kSsrc);
  encoder_rtcp_feedback_.OnReceivedIntraFrameRequest(kSsrc);
  encoder_rtcp_feedback_.OnReceivedIntraFrameRequest(kSsrc);
  encoder_rtcp_feedback_.OnReceivedIntraFrameRequest(kOtherSsrc);
  encoder_rtcp_feedback_.OnReceivedIntraFrameRequest(kOtherSsrc);
  encoder_rtcp_feedback_.OnReceivedIntraFrameRequest(kOtherSsrc);
}

}  // namespace webrtc