/*
 * Copyright 2018 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#define LOG_TAG "BTAudioProviderSession_2_1"

#include "BluetoothAudioSession_2_1.h"

#include <android-base/logging.h>
#include <android-base/stringprintf.h>

namespace android {
namespace bluetooth {
namespace audio {
using SessionType_2_1 =
    ::android::hardware::bluetooth::audio::V2_1::SessionType;
using SessionType_2_0 =
    ::android::hardware::bluetooth::audio::V2_0::SessionType;

::android::hardware::bluetooth::audio::V2_1::AudioConfiguration
    BluetoothAudioSession_2_1::invalidSoftwareAudioConfiguration = {};
::android::hardware::bluetooth::audio::V2_1::AudioConfiguration
    BluetoothAudioSession_2_1::invalidOffloadAudioConfiguration = {};

namespace {
bool is_2_0_session_type(
    const ::android::hardware::bluetooth::audio::V2_1::SessionType&
        session_type) {
  if (session_type == SessionType_2_1::A2DP_SOFTWARE_ENCODING_DATAPATH ||
      session_type == SessionType_2_1::A2DP_HARDWARE_OFFLOAD_DATAPATH ||
      session_type == SessionType_2_1::HEARING_AID_SOFTWARE_ENCODING_DATAPATH) {
    return true;
  } else {
    return false;
  }
}
}  // namespace

BluetoothAudioSession_2_1::BluetoothAudioSession_2_1(
    const ::android::hardware::bluetooth::audio::V2_1::SessionType&
        session_type)
    : audio_session(BluetoothAudioSessionInstance::GetSessionInstance(
          static_cast<SessionType_2_0>(session_type))) {
  if (is_2_0_session_type(session_type)) {
    session_type_2_1_ = (SessionType_2_1::UNKNOWN);
  } else {
    session_type_2_1_ = (session_type);
  }
}

std::shared_ptr<BluetoothAudioSession>
BluetoothAudioSession_2_1::GetAudioSession() {
  return audio_session;
}

// The control function is for the bluetooth_audio module to get the current
// AudioConfiguration
const ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration
BluetoothAudioSession_2_1::GetAudioConfig() {
  std::lock_guard<std::recursive_mutex> guard(audio_session->mutex_);
  if (audio_session->IsSessionReady()) {
    // If session is unknown it means it should be 2.0 type
    if (session_type_2_1_ != SessionType_2_1::UNKNOWN)
      return audio_config_2_1_;

    ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration toConf;
    const AudioConfiguration fromConf = GetAudioSession()->GetAudioConfig();
    // pcmConfig only differs between 2.0 and 2.1 in AudioConfiguration
    if (fromConf.getDiscriminator() ==
        AudioConfiguration::hidl_discriminator::codecConfig) {
      toConf.codecConfig() = fromConf.codecConfig();
    } else {
      toConf.pcmConfig() = {
          .sampleRate = static_cast<
              ::android::hardware::bluetooth::audio::V2_1::SampleRate>(
              fromConf.pcmConfig().sampleRate),
          .channelMode = fromConf.pcmConfig().channelMode,
          .bitsPerSample = fromConf.pcmConfig().bitsPerSample,
          .dataIntervalUs = 0};
    }
    return toConf;
  } else if (session_type_2_1_ ==
             SessionType_2_1::A2DP_HARDWARE_OFFLOAD_DATAPATH) {
    return kInvalidOffloadAudioConfiguration;
  } else {
    return kInvalidSoftwareAudioConfiguration;
  }
}

bool BluetoothAudioSession_2_1::UpdateAudioConfig(
    const ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration&
        audio_config) {
  bool is_software_session =
      (session_type_2_1_ == SessionType_2_1::A2DP_SOFTWARE_ENCODING_DATAPATH ||
       session_type_2_1_ ==
           SessionType_2_1::HEARING_AID_SOFTWARE_ENCODING_DATAPATH ||
       session_type_2_1_ ==
           SessionType_2_1::LE_AUDIO_SOFTWARE_ENCODING_DATAPATH ||
       session_type_2_1_ ==
           SessionType_2_1::LE_AUDIO_SOFTWARE_DECODED_DATAPATH);
  bool is_offload_session =
      (session_type_2_1_ == SessionType_2_1::A2DP_HARDWARE_OFFLOAD_DATAPATH);
  auto audio_config_discriminator = audio_config.getDiscriminator();
  bool is_software_audio_config =
      (is_software_session &&
       audio_config_discriminator ==
           ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration::
               hidl_discriminator::pcmConfig);
  bool is_offload_audio_config =
      (is_offload_session &&
       audio_config_discriminator ==
           ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration::
               hidl_discriminator::codecConfig);
  if (!is_software_audio_config && !is_offload_audio_config) {
    return false;
  }
  audio_config_2_1_ = audio_config;
  return true;
}

// The report function is used to report that the Bluetooth stack has started
// this session without any failure, and will invoke session_changed_cb_ to
// notify those registered bluetooth_audio outputs
void BluetoothAudioSession_2_1::OnSessionStarted(
    const sp<IBluetoothAudioPort> stack_iface, const DataMQ::Descriptor* dataMQ,
    const ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration&
        audio_config) {
  if (session_type_2_1_ == SessionType_2_1::UNKNOWN) {
    ::android::hardware::bluetooth::audio::V2_0::AudioConfiguration config;
    if (audio_config.getDiscriminator() ==
        ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration::
            hidl_discriminator::codecConfig) {
      config.codecConfig(audio_config.codecConfig());
    } else {
      auto& tmpPcm = audio_config.pcmConfig();
      config.pcmConfig(
          ::android::hardware::bluetooth::audio::V2_0::PcmParameters{
              .sampleRate = static_cast<SampleRate>(tmpPcm.sampleRate),
              .channelMode = tmpPcm.channelMode,
              .bitsPerSample = tmpPcm.bitsPerSample
              /*dataIntervalUs is not passed to 2.0 */
          });
    }

    audio_session->OnSessionStarted(stack_iface, dataMQ, config);
  } else {
    std::lock_guard<std::recursive_mutex> guard(audio_session->mutex_);
    if (stack_iface == nullptr) {
      LOG(ERROR) << __func__ << " - SessionType=" << toString(session_type_2_1_)
                 << ", IBluetoothAudioPort Invalid";
    } else if (!UpdateAudioConfig(audio_config)) {
      LOG(ERROR) << __func__ << " - SessionType=" << toString(session_type_2_1_)
                 << ", AudioConfiguration=" << toString(audio_config)
                 << " Invalid";
    } else if (!audio_session->UpdateDataPath(dataMQ)) {
      LOG(ERROR) << __func__ << " - SessionType=" << toString(session_type_2_1_)
                 << " DataMQ Invalid";
      audio_config_2_1_ =
          (session_type_2_1_ == SessionType_2_1::A2DP_HARDWARE_OFFLOAD_DATAPATH
               ? kInvalidOffloadAudioConfiguration
               : kInvalidSoftwareAudioConfiguration);
    } else {
      audio_session->stack_iface_ = stack_iface;
      LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_2_1_)
                << ", AudioConfiguration=" << toString(audio_config);
      audio_session->ReportSessionStatus();
    };
  }
}

std::unique_ptr<BluetoothAudioSessionInstance_2_1>
    BluetoothAudioSessionInstance_2_1::instance_ptr =
        std::unique_ptr<BluetoothAudioSessionInstance_2_1>(
            new BluetoothAudioSessionInstance_2_1());

// API to fetch the session of A2DP / Hearing Aid
std::shared_ptr<BluetoothAudioSession_2_1>
BluetoothAudioSessionInstance_2_1::GetSessionInstance(
    const SessionType_2_1& session_type) {
  std::lock_guard<std::mutex> guard(instance_ptr->mutex_);
  if (!instance_ptr->sessions_map_.empty()) {
    auto entry = instance_ptr->sessions_map_.find(session_type);
    if (entry != instance_ptr->sessions_map_.end()) {
      return entry->second;
    }
  }
  std::shared_ptr<BluetoothAudioSession_2_1> session_ptr =
      std::make_shared<BluetoothAudioSession_2_1>(session_type);
  instance_ptr->sessions_map_[session_type] = session_ptr;
  return session_ptr;
}

}  // namespace audio
}  // namespace bluetooth
}  // namespace android