/*
 *  Copyright (c) 2022 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 "modules/video_coding/frame_helpers.h"

#include <cstddef>
#include <cstdint>
#include <memory>
#include <optional>
#include <utility>

#include "absl/container/inlined_vector.h"
#include "api/scoped_refptr.h"
#include "api/units/timestamp.h"
#include "api/video/corruption_detection/frame_instrumentation_data.h"
#include "api/video/encoded_frame.h"
#include "api/video/encoded_image.h"
#include "test/gmock.h"
#include "test/gtest.h"

namespace webrtc {
namespace {

using ::testing::ElementsAre;

constexpr uint32_t kRtpTimestamp = 123456710;

scoped_refptr<EncodedImageBuffer> CreateEncodedImageBufferOfSizeN(size_t n,
                                                                  uint8_t x) {
  scoped_refptr<EncodedImageBuffer> buffer = EncodedImageBuffer::Create(n);
  for (size_t i = 0; i < n; ++i) {
    buffer->data()[i] = static_cast<uint8_t>(x + i);
  }
  return buffer;
}

// Returns an `EncodedFrame` with data values [x, x+1, ... x+(n-1)].
EncodedFrame CreateEncodedImageOfSizeN(size_t n, uint8_t x) {
  EncodedFrame image;
  image.SetEncodedData(CreateEncodedImageBufferOfSizeN(n, x));
  image.SetRtpTimestamp(kRtpTimestamp);
  return image;
}

TEST(FrameHasBadRenderTimingTest, LargePositiveFrameDelayIsBad) {
  Timestamp render_time = Timestamp::Seconds(12);
  Timestamp now = Timestamp::Seconds(0);

  EXPECT_TRUE(FrameHasBadRenderTiming(render_time, now));
}

TEST(FrameHasBadRenderTimingTest, LargeNegativeFrameDelayIsBad) {
  Timestamp render_time = Timestamp::Seconds(12);
  Timestamp now = Timestamp::Seconds(24);

  EXPECT_TRUE(FrameHasBadRenderTiming(render_time, now));
}

TEST(FrameInstrumentationDataTest,
     CombinedFrameHasSameDataAsHighestSpatialLayer) {
  // Assume L2T1 scalability mode.
  EncodedFrame spatial_layer_1 = CreateEncodedImageOfSizeN(/*n=*/10, /*x=*/1);
  FrameInstrumentationData frame_ins_data_1;
  frame_ins_data_1.SetSequenceIndex(100);
  frame_ins_data_1.SetStdDev(0.5);
  frame_ins_data_1.SetLumaErrorThreshold(5);
  frame_ins_data_1.SetChromaErrorThreshold(5);
  frame_ins_data_1.SetSampleValues({0.2, 0.7, 1.9});
  spatial_layer_1.SetFrameInstrumentationData(frame_ins_data_1);

  EncodedFrame spatial_layer_2 = CreateEncodedImageOfSizeN(/*n=*/10, /*x=*/11);
  FrameInstrumentationData frame_ins_data_2;
  frame_ins_data_2.SetSequenceIndex(10);
  frame_ins_data_2.SetStdDev(1.0);
  frame_ins_data_2.SetLumaErrorThreshold(3);
  frame_ins_data_2.SetChromaErrorThreshold(4);
  frame_ins_data_2.SetSampleValues({0.1, 0.3, 2.1});
  spatial_layer_2.SetFrameInstrumentationData(frame_ins_data_2);

  absl::InlinedVector<std::unique_ptr<EncodedFrame>, 4> frames;
  frames.push_back(std::make_unique<EncodedFrame>(spatial_layer_1));
  frames.push_back(std::make_unique<EncodedFrame>(spatial_layer_2));

  std::optional<FrameInstrumentationData> frame_instrumentation_data =
      CombineAndDeleteFrames(std::move(frames))
          ->CodecSpecific()
          ->frame_instrumentation_data;

  ASSERT_TRUE(frame_instrumentation_data.has_value());

  // Expect to have the same frame_instrumentation_data as the highest spatial
  // layer.
  EXPECT_EQ(frame_instrumentation_data->sequence_index(), 10);
  EXPECT_EQ(frame_instrumentation_data->std_dev(), 1.0);
  EXPECT_EQ(frame_instrumentation_data->luma_error_threshold(), 3);
  EXPECT_EQ(frame_instrumentation_data->chroma_error_threshold(), 4);
  EXPECT_THAT(frame_instrumentation_data->sample_values(),
              ElementsAre(0.1, 0.3, 2.1));
}

}  // namespace
}  // namespace webrtc