/*
 *  Copyright (c) 2015 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 <memory>
#include <vector>

#include "audio/audio_state.h"
#include "call/test/mock_audio_send_stream.h"
#include "modules/audio_device/include/mock_audio_device.h"
#include "modules/audio_mixer/audio_mixer_impl.h"
#include "modules/audio_processing/include/mock_audio_processing.h"
#include "rtc_base/refcountedobject.h"
#include "test/gtest.h"

namespace webrtc {
namespace test {
namespace {

constexpr int kSampleRate = 16000;
constexpr int kNumberOfChannels = 1;

struct ConfigHelper {
  ConfigHelper() : audio_mixer(AudioMixerImpl::Create()) {
    audio_state_config.audio_mixer = audio_mixer;
    audio_state_config.audio_processing =
        new rtc::RefCountedObject<testing::NiceMock<MockAudioProcessing>>();
    audio_state_config.audio_device_module =
        new rtc::RefCountedObject<MockAudioDeviceModule>();
  }
  AudioState::Config& config() { return audio_state_config; }
  rtc::scoped_refptr<AudioMixer> mixer() { return audio_mixer; }

 private:
  AudioState::Config audio_state_config;
  rtc::scoped_refptr<AudioMixer> audio_mixer;
};

class FakeAudioSource : public AudioMixer::Source {
 public:
  // TODO(aleloi): Valid overrides commented out, because the gmock
  // methods don't use any override declarations, and we want to avoid
  // warnings from -Winconsistent-missing-override. See
  // http://crbug.com/428099.
  int Ssrc() const /*override*/ { return 0; }

  int PreferredSampleRate() const /*override*/ { return kSampleRate; }

  MOCK_METHOD2(GetAudioFrameWithInfo,
               AudioFrameInfo(int sample_rate_hz, AudioFrame* audio_frame));
};

std::vector<int16_t> Create10msSilentTestData(int sample_rate_hz,
                                              size_t num_channels) {
  const int samples_per_channel = sample_rate_hz / 100;
  std::vector<int16_t> audio_data(samples_per_channel * num_channels, 0);
  return audio_data;
}

std::vector<int16_t> Create10msTestData(int sample_rate_hz,
                                        size_t num_channels) {
  const int samples_per_channel = sample_rate_hz / 100;
  std::vector<int16_t> audio_data(samples_per_channel * num_channels, 0);
  // Fill the first channel with a 1kHz sine wave.
  const float inc = (2 * 3.14159265f * 1000) / sample_rate_hz;
  float w = 0.f;
  for (int i = 0; i < samples_per_channel; ++i) {
    audio_data[i * num_channels] = static_cast<int16_t>(32767.f * std::sin(w));
    w += inc;
  }
  return audio_data;
}

std::vector<uint32_t> ComputeChannelLevels(AudioFrame* audio_frame) {
  const size_t num_channels = audio_frame->num_channels_;
  const size_t samples_per_channel = audio_frame->samples_per_channel_;
  std::vector<uint32_t> levels(num_channels, 0);
  for (size_t i = 0; i < samples_per_channel; ++i) {
    for (size_t j = 0; j < num_channels; ++j) {
      levels[j] += std::abs(audio_frame->data()[i * num_channels + j]);
    }
  }
  return levels;
}
}  // namespace

TEST(AudioStateTest, Create) {
  ConfigHelper helper;
  auto audio_state = AudioState::Create(helper.config());
  EXPECT_TRUE(audio_state.get());
}

TEST(AudioStateTest, ConstructDestruct) {
  ConfigHelper helper;
  std::unique_ptr<internal::AudioState> audio_state(
      new internal::AudioState(helper.config()));
}

TEST(AudioStateTest, RecordedAudioArrivesAtSingleStream) {
  ConfigHelper helper;
  std::unique_ptr<internal::AudioState> audio_state(
      new internal::AudioState(helper.config()));

  MockAudioSendStream stream;
  audio_state->AddSendingStream(&stream, 8000, 2);

  EXPECT_CALL(
      stream,
      SendAudioDataForMock(testing::AllOf(
          testing::Field(&AudioFrame::sample_rate_hz_, testing::Eq(8000)),
          testing::Field(&AudioFrame::num_channels_, testing::Eq(2u)))))
      .WillOnce(
          // Verify that channels are not swapped by default.
          testing::Invoke([](AudioFrame* audio_frame) {
            auto levels = ComputeChannelLevels(audio_frame);
            EXPECT_LT(0u, levels[0]);
            EXPECT_EQ(0u, levels[1]);
          }));
  MockAudioProcessing* ap =
      static_cast<MockAudioProcessing*>(audio_state->audio_processing());
  EXPECT_CALL(*ap, set_stream_delay_ms(0));
  EXPECT_CALL(*ap, set_stream_key_pressed(false));
  EXPECT_CALL(*ap, ProcessStream(testing::_));

  constexpr int kSampleRate = 16000;
  constexpr size_t kNumChannels = 2;
  auto audio_data = Create10msTestData(kSampleRate, kNumChannels);
  uint32_t new_mic_level = 667;
  audio_state->audio_transport()->RecordedDataIsAvailable(
      &audio_data[0], kSampleRate / 100, kNumChannels * 2, kNumChannels,
      kSampleRate, 0, 0, 0, false, new_mic_level);
  EXPECT_EQ(667u, new_mic_level);

  audio_state->RemoveSendingStream(&stream);
}

TEST(AudioStateTest, RecordedAudioArrivesAtMultipleStreams) {
  ConfigHelper helper;
  std::unique_ptr<internal::AudioState> audio_state(
      new internal::AudioState(helper.config()));

  MockAudioSendStream stream_1;
  MockAudioSendStream stream_2;
  audio_state->AddSendingStream(&stream_1, 8001, 2);
  audio_state->AddSendingStream(&stream_2, 32000, 1);

  EXPECT_CALL(
      stream_1,
      SendAudioDataForMock(testing::AllOf(
          testing::Field(&AudioFrame::sample_rate_hz_, testing::Eq(16000)),
          testing::Field(&AudioFrame::num_channels_, testing::Eq(1u)))))
      .WillOnce(
          // Verify that there is output signal.
          testing::Invoke([](AudioFrame* audio_frame) {
            auto levels = ComputeChannelLevels(audio_frame);
            EXPECT_LT(0u, levels[0]);
          }));
  EXPECT_CALL(
      stream_2,
      SendAudioDataForMock(testing::AllOf(
          testing::Field(&AudioFrame::sample_rate_hz_, testing::Eq(16000)),
          testing::Field(&AudioFrame::num_channels_, testing::Eq(1u)))))
      .WillOnce(
          // Verify that there is output signal.
          testing::Invoke([](AudioFrame* audio_frame) {
            auto levels = ComputeChannelLevels(audio_frame);
            EXPECT_LT(0u, levels[0]);
          }));
  MockAudioProcessing* ap =
      static_cast<MockAudioProcessing*>(audio_state->audio_processing());
  EXPECT_CALL(*ap, set_stream_delay_ms(5));
  EXPECT_CALL(*ap, set_stream_key_pressed(true));
  EXPECT_CALL(*ap, ProcessStream(testing::_));

  constexpr int kSampleRate = 16000;
  constexpr size_t kNumChannels = 1;
  auto audio_data = Create10msTestData(kSampleRate, kNumChannels);
  uint32_t new_mic_level = 667;
  audio_state->audio_transport()->RecordedDataIsAvailable(
      &audio_data[0], kSampleRate / 100, kNumChannels * 2, kNumChannels,
      kSampleRate, 5, 0, 0, true, new_mic_level);
  EXPECT_EQ(667u, new_mic_level);

  audio_state->RemoveSendingStream(&stream_1);
  audio_state->RemoveSendingStream(&stream_2);
}

TEST(AudioStateTest, EnableChannelSwap) {
  constexpr int kSampleRate = 16000;
  constexpr size_t kNumChannels = 2;

  ConfigHelper helper;
  std::unique_ptr<internal::AudioState> audio_state(
      new internal::AudioState(helper.config()));
  audio_state->SetStereoChannelSwapping(true);

  MockAudioSendStream stream;
  audio_state->AddSendingStream(&stream, kSampleRate, kNumChannels);

  EXPECT_CALL(stream, SendAudioDataForMock(testing::_))
      .WillOnce(
          // Verify that channels are swapped.
          testing::Invoke([](AudioFrame* audio_frame) {
            auto levels = ComputeChannelLevels(audio_frame);
            EXPECT_EQ(0u, levels[0]);
            EXPECT_LT(0u, levels[1]);
          }));

  auto audio_data = Create10msTestData(kSampleRate, kNumChannels);
  uint32_t new_mic_level = 667;
  audio_state->audio_transport()->RecordedDataIsAvailable(
      &audio_data[0], kSampleRate / 100, kNumChannels * 2, kNumChannels,
      kSampleRate, 0, 0, 0, false, new_mic_level);
  EXPECT_EQ(667u, new_mic_level);

  audio_state->RemoveSendingStream(&stream);
}

TEST(AudioStateTest, InputLevelStats) {
  constexpr int kSampleRate = 16000;
  constexpr size_t kNumChannels = 1;

  ConfigHelper helper;
  std::unique_ptr<internal::AudioState> audio_state(
      new internal::AudioState(helper.config()));

  // Push a silent buffer -> Level stats should be zeros except for duration.
  {
    auto audio_data = Create10msSilentTestData(kSampleRate, kNumChannels);
    uint32_t new_mic_level = 667;
    audio_state->audio_transport()->RecordedDataIsAvailable(
        &audio_data[0], kSampleRate / 100, kNumChannels * 2, kNumChannels,
        kSampleRate, 0, 0, 0, false, new_mic_level);
    auto stats = audio_state->GetAudioInputStats();
    EXPECT_EQ(0, stats.audio_level);
    EXPECT_THAT(stats.total_energy, testing::DoubleEq(0.0));
    EXPECT_THAT(stats.total_duration, testing::DoubleEq(0.01));
  }

  // Push 10 non-silent buffers -> Level stats should be non-zero.
  {
    auto audio_data = Create10msTestData(kSampleRate, kNumChannels);
    uint32_t new_mic_level = 667;
    for (int i = 0; i < 10; ++i) {
      audio_state->audio_transport()->RecordedDataIsAvailable(
          &audio_data[0], kSampleRate / 100, kNumChannels * 2, kNumChannels,
          kSampleRate, 0, 0, 0, false, new_mic_level);
    }
    auto stats = audio_state->GetAudioInputStats();
    EXPECT_EQ(32767, stats.audio_level);
    EXPECT_THAT(stats.total_energy, testing::DoubleEq(0.01));
    EXPECT_THAT(stats.total_duration, testing::DoubleEq(0.11));
  }
}

TEST(AudioStateTest,
     QueryingTransportForAudioShouldResultInGetAudioCallOnMixerSource) {
  ConfigHelper helper;
  auto audio_state = AudioState::Create(helper.config());

  FakeAudioSource fake_source;
  helper.mixer()->AddSource(&fake_source);

  EXPECT_CALL(fake_source, GetAudioFrameWithInfo(testing::_, testing::_))
      .WillOnce(
          testing::Invoke([](int sample_rate_hz, AudioFrame* audio_frame) {
            audio_frame->sample_rate_hz_ = sample_rate_hz;
            audio_frame->samples_per_channel_ = sample_rate_hz / 100;
            audio_frame->num_channels_ = kNumberOfChannels;
            return AudioMixer::Source::AudioFrameInfo::kNormal;
          }));

  int16_t audio_buffer[kSampleRate / 100 * kNumberOfChannels];
  size_t n_samples_out;
  int64_t elapsed_time_ms;
  int64_t ntp_time_ms;
  audio_state->audio_transport()->NeedMorePlayData(
      kSampleRate / 100, kNumberOfChannels * 2, kNumberOfChannels, kSampleRate,
      audio_buffer, n_samples_out, &elapsed_time_ms, &ntp_time_ms);
}
}  // namespace test
}  // namespace webrtc