/*
 *  Copyright (c) 2016 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 <iostream>

#include "absl/memory/memory.h"
#include "modules/audio_processing/echo_cancellation_impl.h"
#include "modules/audio_processing/echo_control_mobile_impl.h"
#include "modules/audio_processing/test/aec_dump_based_simulator.h"
#include "modules/audio_processing/test/protobuf_utils.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/numerics/safe_conversions.h"

namespace webrtc {
namespace test {
namespace {

// Verify output bitexactness for the fixed interface.
// TODO(peah): Check whether it would make sense to add a threshold
// to use for checking the bitexactness in a soft manner.
bool VerifyFixedBitExactness(const webrtc::audioproc::Stream& msg,
                             const AudioFrame& frame) {
  if ((sizeof(int16_t) * frame.samples_per_channel_ * frame.num_channels_) !=
      msg.output_data().size()) {
    return false;
  } else {
    const int16_t* frame_data = frame.data();
    for (size_t k = 0; k < frame.num_channels_ * frame.samples_per_channel_;
         ++k) {
      if (msg.output_data().data()[k] != frame_data[k]) {
        return false;
      }
    }
  }
  return true;
}

// Verify output bitexactness for the float interface.
bool VerifyFloatBitExactness(const webrtc::audioproc::Stream& msg,
                             const StreamConfig& out_config,
                             const ChannelBuffer<float>& out_buf) {
  if (static_cast<size_t>(msg.output_channel_size()) !=
          out_config.num_channels() ||
      msg.output_channel(0).size() != out_config.num_frames()) {
    return false;
  } else {
    for (int ch = 0; ch < msg.output_channel_size(); ++ch) {
      for (size_t sample = 0; sample < out_config.num_frames(); ++sample) {
        if (msg.output_channel(ch).data()[sample] !=
            out_buf.channels()[ch][sample]) {
          return false;
        }
      }
    }
  }
  return true;
}

}  // namespace

AecDumpBasedSimulator::AecDumpBasedSimulator(
    const SimulationSettings& settings,
    std::unique_ptr<AudioProcessingBuilder> ap_builder)
    : AudioProcessingSimulator(settings, std::move(ap_builder)) {
  MaybeOpenCallOrderFile();
}

AecDumpBasedSimulator::~AecDumpBasedSimulator() = default;

void AecDumpBasedSimulator::PrepareProcessStreamCall(
    const webrtc::audioproc::Stream& msg) {
  if (msg.has_input_data()) {
    // Fixed interface processing.
    // Verify interface invariance.
    RTC_CHECK(interface_used_ == InterfaceType::kFixedInterface ||
              interface_used_ == InterfaceType::kNotSpecified);
    interface_used_ = InterfaceType::kFixedInterface;

    // Populate input buffer.
    RTC_CHECK_EQ(sizeof(*fwd_frame_.data()) * fwd_frame_.samples_per_channel_ *
                     fwd_frame_.num_channels_,
                 msg.input_data().size());
    memcpy(fwd_frame_.mutable_data(), msg.input_data().data(),
           msg.input_data().size());
  } else {
    // Float interface processing.
    // Verify interface invariance.
    RTC_CHECK(interface_used_ == InterfaceType::kFloatInterface ||
              interface_used_ == InterfaceType::kNotSpecified);
    interface_used_ = InterfaceType::kFloatInterface;

    RTC_CHECK_EQ(in_buf_->num_channels(),
                 static_cast<size_t>(msg.input_channel_size()));

    // Populate input buffer.
    for (size_t i = 0; i < in_buf_->num_channels(); ++i) {
      RTC_CHECK_EQ(in_buf_->num_frames() * sizeof(*in_buf_->channels()[i]),
                   msg.input_channel(i).size());
      std::memcpy(in_buf_->channels()[i], msg.input_channel(i).data(),
                  msg.input_channel(i).size());
    }
  }

  if (artificial_nearend_buffer_reader_) {
    if (artificial_nearend_buffer_reader_->Read(
            artificial_nearend_buf_.get())) {
      if (msg.has_input_data()) {
        int16_t* fwd_frame_data = fwd_frame_.mutable_data();
        for (size_t k = 0; k < in_buf_->num_frames(); ++k) {
          fwd_frame_data[k] = rtc::saturated_cast<int16_t>(
              fwd_frame_data[k] +
              static_cast<int16_t>(32767 *
                                   artificial_nearend_buf_->channels()[0][k]));
        }
      } else {
        for (int i = 0; i < msg.input_channel_size(); ++i) {
          for (size_t k = 0; k < in_buf_->num_frames(); ++k) {
            in_buf_->channels()[i][k] +=
                artificial_nearend_buf_->channels()[0][k];
            in_buf_->channels()[i][k] = std::min(
                32767.f, std::max(-32768.f, in_buf_->channels()[i][k]));
          }
        }
      }
    } else {
      if (!artificial_nearend_eof_reported_) {
        std::cout << "The artificial nearend file ended before the recording.";
        artificial_nearend_eof_reported_ = true;
      }
    }
  }

  if (!settings_.use_stream_delay || *settings_.use_stream_delay) {
    if (!settings_.stream_delay) {
      if (msg.has_delay()) {
        RTC_CHECK_EQ(AudioProcessing::kNoError,
                     ap_->set_stream_delay_ms(msg.delay()));
      }
    } else {
      RTC_CHECK_EQ(AudioProcessing::kNoError,
                   ap_->set_stream_delay_ms(*settings_.stream_delay));
    }
  }

  if (!settings_.use_ts) {
    if (msg.has_keypress()) {
      ap_->set_stream_key_pressed(msg.keypress());
    }
  } else {
    ap_->set_stream_key_pressed(*settings_.use_ts);
  }

  // Level is always logged in AEC dumps.
  RTC_CHECK(msg.has_level());
  aec_dump_mic_level_ = msg.level();
}

void AecDumpBasedSimulator::VerifyProcessStreamBitExactness(
    const webrtc::audioproc::Stream& msg) {
  if (bitexact_output_) {
    if (interface_used_ == InterfaceType::kFixedInterface) {
      bitexact_output_ = VerifyFixedBitExactness(msg, fwd_frame_);
    } else {
      bitexact_output_ = VerifyFloatBitExactness(msg, out_config_, *out_buf_);
    }
  }
}

void AecDumpBasedSimulator::PrepareReverseProcessStreamCall(
    const webrtc::audioproc::ReverseStream& msg) {
  if (msg.has_data()) {
    // Fixed interface processing.
    // Verify interface invariance.
    RTC_CHECK(interface_used_ == InterfaceType::kFixedInterface ||
              interface_used_ == InterfaceType::kNotSpecified);
    interface_used_ = InterfaceType::kFixedInterface;

    // Populate input buffer.
    RTC_CHECK_EQ(sizeof(int16_t) * rev_frame_.samples_per_channel_ *
                     rev_frame_.num_channels_,
                 msg.data().size());
    memcpy(rev_frame_.mutable_data(), msg.data().data(), msg.data().size());
  } else {
    // Float interface processing.
    // Verify interface invariance.
    RTC_CHECK(interface_used_ == InterfaceType::kFloatInterface ||
              interface_used_ == InterfaceType::kNotSpecified);
    interface_used_ = InterfaceType::kFloatInterface;

    RTC_CHECK_EQ(reverse_in_buf_->num_channels(),
                 static_cast<size_t>(msg.channel_size()));

    // Populate input buffer.
    for (int i = 0; i < msg.channel_size(); ++i) {
      RTC_CHECK_EQ(reverse_in_buf_->num_frames() *
                       sizeof(*reverse_in_buf_->channels()[i]),
                   msg.channel(i).size());
      std::memcpy(reverse_in_buf_->channels()[i], msg.channel(i).data(),
                  msg.channel(i).size());
    }
  }
}

void AecDumpBasedSimulator::Process() {
  CreateAudioProcessor();
  dump_input_file_ = OpenFile(settings_.aec_dump_input_filename->c_str(), "rb");

  if (settings_.artificial_nearend_filename) {
    std::unique_ptr<WavReader> artificial_nearend_file(
        new WavReader(settings_.artificial_nearend_filename->c_str()));

    RTC_CHECK_EQ(1, artificial_nearend_file->num_channels())
        << "Only mono files for the artificial nearend are supported, "
           "reverted to not using the artificial nearend file";

    const int sample_rate_hz = artificial_nearend_file->sample_rate();
    artificial_nearend_buffer_reader_.reset(
        new ChannelBufferWavReader(std::move(artificial_nearend_file)));
    artificial_nearend_buf_.reset(new ChannelBuffer<float>(
        rtc::CheckedDivExact(sample_rate_hz, kChunksPerSecond), 1));
  }

  webrtc::audioproc::Event event_msg;
  int num_forward_chunks_processed = 0;
  while (ReadMessageFromFile(dump_input_file_, &event_msg)) {
    switch (event_msg.type()) {
      case webrtc::audioproc::Event::INIT:
        RTC_CHECK(event_msg.has_init());
        HandleMessage(event_msg.init());
        break;
      case webrtc::audioproc::Event::STREAM:
        RTC_CHECK(event_msg.has_stream());
        HandleMessage(event_msg.stream());
        ++num_forward_chunks_processed;
        break;
      case webrtc::audioproc::Event::REVERSE_STREAM:
        RTC_CHECK(event_msg.has_reverse_stream());
        HandleMessage(event_msg.reverse_stream());
        break;
      case webrtc::audioproc::Event::CONFIG:
        RTC_CHECK(event_msg.has_config());
        HandleMessage(event_msg.config());
        break;
      case webrtc::audioproc::Event::RUNTIME_SETTING:
        HandleMessage(event_msg.runtime_setting());
        break;
      case webrtc::audioproc::Event::UNKNOWN_EVENT:
        RTC_CHECK(false);
        break;
    }
  }

  fclose(dump_input_file_);

  DestroyAudioProcessor();
}

void AecDumpBasedSimulator::HandleMessage(
    const webrtc::audioproc::Config& msg) {
  if (settings_.use_verbose_logging) {
    std::cout << "Config at frame:" << std::endl;
    std::cout << " Forward: " << get_num_process_stream_calls() << std::endl;
    std::cout << " Reverse: " << get_num_reverse_process_stream_calls()
              << std::endl;
  }

  if (!settings_.discard_all_settings_in_aecdump) {
    if (settings_.use_verbose_logging) {
      std::cout << "Setting used in config:" << std::endl;
    }
    Config config;
    AudioProcessing::Config apm_config = ap_->GetConfig();

    if (msg.has_aec_enabled() || settings_.use_aec) {
      bool enable = settings_.use_aec ? *settings_.use_aec : msg.aec_enabled();
      apm_config.echo_canceller.enabled = enable;
      if (settings_.use_verbose_logging) {
        std::cout << " aec_enabled: " << (enable ? "true" : "false")
                  << std::endl;
      }
    }

    if (msg.has_aec_delay_agnostic_enabled() || settings_.use_delay_agnostic) {
      bool enable = settings_.use_delay_agnostic
                        ? *settings_.use_delay_agnostic
                        : msg.aec_delay_agnostic_enabled();
      config.Set<DelayAgnostic>(new DelayAgnostic(enable));
      if (settings_.use_verbose_logging) {
        std::cout << " aec_delay_agnostic_enabled: "
                  << (enable ? "true" : "false") << std::endl;
      }
    }

    if (msg.has_aec_drift_compensation_enabled() ||
        settings_.use_drift_compensation) {
      if (settings_.use_drift_compensation
              ? *settings_.use_drift_compensation
              : msg.aec_drift_compensation_enabled()) {
        RTC_LOG(LS_ERROR)
            << "Ignoring deprecated setting: AEC2 drift compensation";
      }
    }

    if (msg.has_aec_extended_filter_enabled() ||
        settings_.use_extended_filter) {
      bool enable = settings_.use_extended_filter
                        ? *settings_.use_extended_filter
                        : msg.aec_extended_filter_enabled();
      config.Set<ExtendedFilter>(new ExtendedFilter(enable));
      if (settings_.use_verbose_logging) {
        std::cout << " aec_extended_filter_enabled: "
                  << (enable ? "true" : "false") << std::endl;
      }
    }

    if (msg.has_aec_suppression_level() || settings_.aec_suppression_level) {
      auto level = static_cast<webrtc::EchoCancellationImpl::SuppressionLevel>(
          settings_.aec_suppression_level ? *settings_.aec_suppression_level
                                          : msg.aec_suppression_level());
      if (level ==
          webrtc::EchoCancellationImpl::SuppressionLevel::kLowSuppression) {
        RTC_LOG(LS_ERROR)
            << "Ignoring deprecated setting: AEC2 low suppression";
      } else {
        apm_config.echo_canceller.legacy_moderate_suppression_level =
            (level == webrtc::EchoCancellationImpl::SuppressionLevel::
                          kModerateSuppression);
        if (settings_.use_verbose_logging) {
          std::cout << " aec_suppression_level: " << level << std::endl;
        }
      }
    }

    if (msg.has_aecm_enabled() || settings_.use_aecm) {
      bool enable =
          settings_.use_aecm ? *settings_.use_aecm : msg.aecm_enabled();
      apm_config.echo_canceller.enabled |= enable;
      apm_config.echo_canceller.mobile_mode = enable;
      if (settings_.use_verbose_logging) {
        std::cout << " aecm_enabled: " << (enable ? "true" : "false")
                  << std::endl;
      }
    }

    if (msg.has_aecm_comfort_noise_enabled() &&
        msg.aecm_comfort_noise_enabled()) {
      RTC_LOG(LS_ERROR) << "Ignoring deprecated setting: AECM comfort noise";
    }

    if (msg.has_aecm_routing_mode() &&
        static_cast<webrtc::EchoControlMobileImpl::RoutingMode>(
            msg.aecm_routing_mode()) != EchoControlMobileImpl::kSpeakerphone) {
      RTC_LOG(LS_ERROR) << "Ignoring deprecated setting: AECM routing mode: "
                        << msg.aecm_routing_mode();
    }

    if (msg.has_agc_enabled() || settings_.use_agc) {
      bool enable = settings_.use_agc ? *settings_.use_agc : msg.agc_enabled();
      RTC_CHECK_EQ(AudioProcessing::kNoError,
                   ap_->gain_control()->Enable(enable));
      if (settings_.use_verbose_logging) {
        std::cout << " agc_enabled: " << (enable ? "true" : "false")
                  << std::endl;
      }
    }

    if (msg.has_agc_mode() || settings_.agc_mode) {
      int mode = settings_.agc_mode ? *settings_.agc_mode : msg.agc_mode();
      RTC_CHECK_EQ(AudioProcessing::kNoError,
                   ap_->gain_control()->set_mode(
                       static_cast<webrtc::GainControl::Mode>(mode)));
      if (settings_.use_verbose_logging) {
        std::cout << " agc_mode: " << mode << std::endl;
      }
    }

    if (msg.has_agc_limiter_enabled() || settings_.use_agc_limiter) {
      bool enable = settings_.use_agc_limiter ? *settings_.use_agc_limiter
                                              : msg.agc_limiter_enabled();
      RTC_CHECK_EQ(AudioProcessing::kNoError,
                   ap_->gain_control()->enable_limiter(enable));
      if (settings_.use_verbose_logging) {
        std::cout << " agc_limiter_enabled: " << (enable ? "true" : "false")
                  << std::endl;
      }
    }

    // TODO(peah): Add support for controlling the Experimental AGC from the
    // command line.
    if (msg.has_noise_robust_agc_enabled()) {
      config.Set<ExperimentalAgc>(
          new ExperimentalAgc(msg.noise_robust_agc_enabled()));
      if (settings_.use_verbose_logging) {
        std::cout << " noise_robust_agc_enabled: "
                  << (msg.noise_robust_agc_enabled() ? "true" : "false")
                  << std::endl;
      }
    }

    if (msg.has_transient_suppression_enabled() || settings_.use_ts) {
      bool enable = settings_.use_ts ? *settings_.use_ts
                                     : msg.transient_suppression_enabled();
      config.Set<ExperimentalNs>(new ExperimentalNs(enable));
      if (settings_.use_verbose_logging) {
        std::cout << " transient_suppression_enabled: "
                  << (enable ? "true" : "false") << std::endl;
      }
    }

    if (msg.has_hpf_enabled() || settings_.use_hpf) {
      bool enable = settings_.use_hpf ? *settings_.use_hpf : msg.hpf_enabled();
      apm_config.high_pass_filter.enabled = enable;
      if (settings_.use_verbose_logging) {
        std::cout << " hpf_enabled: " << (enable ? "true" : "false")
                  << std::endl;
      }
    }

    if (msg.has_ns_enabled() || settings_.use_ns) {
      bool enable = settings_.use_ns ? *settings_.use_ns : msg.ns_enabled();
      apm_config.noise_suppression.enabled = enable;
      if (settings_.use_verbose_logging) {
        std::cout << " ns_enabled: " << (enable ? "true" : "false")
                  << std::endl;
      }
    }

    if (msg.has_ns_level() || settings_.ns_level) {
      int level = settings_.ns_level ? *settings_.ns_level : msg.ns_level();
      apm_config.noise_suppression.level =
          static_cast<AudioProcessing::Config::NoiseSuppression::Level>(level);
      if (settings_.use_verbose_logging) {
        std::cout << " ns_level: " << level << std::endl;
      }
    }

    if (msg.has_pre_amplifier_enabled() || settings_.use_pre_amplifier) {
      const bool enable = settings_.use_pre_amplifier
                              ? *settings_.use_pre_amplifier
                              : msg.pre_amplifier_enabled();
      apm_config.pre_amplifier.enabled = enable;
      if (settings_.pre_amplifier_gain_factor) {
        apm_config.pre_amplifier.fixed_gain_factor =
            *settings_.pre_amplifier_gain_factor;
      }
    }

    if (settings_.use_verbose_logging && msg.has_experiments_description() &&
        !msg.experiments_description().empty()) {
      std::cout << " experiments not included by default in the simulation: "
                << msg.experiments_description() << std::endl;
    }

    if (settings_.use_refined_adaptive_filter) {
      config.Set<RefinedAdaptiveFilter>(
          new RefinedAdaptiveFilter(*settings_.use_refined_adaptive_filter));
    }

    if (settings_.use_ed) {
      apm_config.residual_echo_detector.enabled = *settings_.use_ed;
    }

    ap_->ApplyConfig(apm_config);
    ap_->SetExtraOptions(config);
  }
}

void AecDumpBasedSimulator::HandleMessage(const webrtc::audioproc::Init& msg) {
  RTC_CHECK(msg.has_sample_rate());
  RTC_CHECK(msg.has_num_input_channels());
  RTC_CHECK(msg.has_num_reverse_channels());
  RTC_CHECK(msg.has_reverse_sample_rate());
  MaybeOpenCallOrderFile();

  if (settings_.use_verbose_logging) {
    std::cout << "Init at frame:" << std::endl;
    std::cout << " Forward: " << get_num_process_stream_calls() << std::endl;
    std::cout << " Reverse: " << get_num_reverse_process_stream_calls()
              << std::endl;
  }

  int num_output_channels;
  if (settings_.output_num_channels) {
    num_output_channels = *settings_.output_num_channels;
  } else {
    num_output_channels = msg.has_num_output_channels()
                              ? msg.num_output_channels()
                              : msg.num_input_channels();
  }

  int output_sample_rate;
  if (settings_.output_sample_rate_hz) {
    output_sample_rate = *settings_.output_sample_rate_hz;
  } else {
    output_sample_rate = msg.has_output_sample_rate() ? msg.output_sample_rate()
                                                      : msg.sample_rate();
  }

  int num_reverse_output_channels;
  if (settings_.reverse_output_num_channels) {
    num_reverse_output_channels = *settings_.reverse_output_num_channels;
  } else {
    num_reverse_output_channels = msg.has_num_reverse_output_channels()
                                      ? msg.num_reverse_output_channels()
                                      : msg.num_reverse_channels();
  }

  int reverse_output_sample_rate;
  if (settings_.reverse_output_sample_rate_hz) {
    reverse_output_sample_rate = *settings_.reverse_output_sample_rate_hz;
  } else {
    reverse_output_sample_rate = msg.has_reverse_output_sample_rate()
                                     ? msg.reverse_output_sample_rate()
                                     : msg.reverse_sample_rate();
  }

  SetupBuffersConfigsOutputs(
      msg.sample_rate(), output_sample_rate, msg.reverse_sample_rate(),
      reverse_output_sample_rate, msg.num_input_channels(), num_output_channels,
      msg.num_reverse_channels(), num_reverse_output_channels);
}

void AecDumpBasedSimulator::HandleMessage(
    const webrtc::audioproc::Stream& msg) {
  if (call_order_output_file_) {
    *call_order_output_file_ << "c";
  }
  PrepareProcessStreamCall(msg);
  ProcessStream(interface_used_ == InterfaceType::kFixedInterface);
  VerifyProcessStreamBitExactness(msg);
}

void AecDumpBasedSimulator::HandleMessage(
    const webrtc::audioproc::ReverseStream& msg) {
  if (call_order_output_file_) {
    *call_order_output_file_ << "r";
  }
  PrepareReverseProcessStreamCall(msg);
  ProcessReverseStream(interface_used_ == InterfaceType::kFixedInterface);
}

void AecDumpBasedSimulator::HandleMessage(
    const webrtc::audioproc::RuntimeSetting& msg) {
  RTC_CHECK(ap_.get());
  // Handle capture pre-gain runtime setting only if not overridden.
  if ((!settings_.use_pre_amplifier || !(*settings_.use_pre_amplifier)) &&
      !settings_.pre_amplifier_gain_factor) {
    ap_->SetRuntimeSetting(
        AudioProcessing::RuntimeSetting::CreateCapturePreGain(
            msg.capture_pre_gain()));
  }
}

void AecDumpBasedSimulator::MaybeOpenCallOrderFile() {
  if (settings_.call_order_output_filename.has_value()) {
    const std::string filename = settings_.store_intermediate_output
                                     ? *settings_.call_order_output_filename +
                                           "_" +
                                           std::to_string(output_reset_counter_)
                                     : *settings_.call_order_output_filename;
    call_order_output_file_ = absl::make_unique<std::ofstream>(filename);
  }
}

}  // namespace test
}  // namespace webrtc