#include "device/device.h"

#include <glog/logging.h>

#include <algorithm>
#include <stdexcept>

#include "device/device_s.h"
#include "internal/channels.h"
#include "internal/config.h"
#include "internal/streams.h"
#include "internal/strings.h"
#include "internal/types.h"
#include "uvc/uvc.h"

MYNTEYE_BEGIN_NAMESPACE

Device::Device(const Model &model, std::shared_ptr<uvc::device> device)
    : video_streaming_(false),
      motion_tracking_(false),
      model_(model),
      device_(device),
      streams_(nullptr),
      channels_(std::make_shared<Channels>(device)) {
  VLOG(2) << __func__;
  ReadDeviceInfo();
}

Device::~Device() {
  VLOG(2) << __func__;
}

std::shared_ptr<Device> Device::Create(
    const std::string &name, std::shared_ptr<uvc::device> device) {
  if (name == "MYNTEYE") {
    return std::make_shared<StandardDevice>(device);
  } else if (strings::starts_with(name, "MYNT-EYE-")) {
    // TODO(JohnZhao): Create different device by name, such as MYNT-EYE-S1000
  }
  return nullptr;
}

bool Device::Supports(const Stream &stream) const {
  auto &&supports = stream_supports_map.at(model_);
  return supports.find(stream) != supports.end();
}

bool Device::Supports(const Capabilities &capability) const {
  auto &&supports = capabilities_supports_map.at(model_);
  return supports.find(capability) != supports.end();
}

bool Device::Supports(const Option &option) const {
  auto &&supports = option_supports_map.at(model_);
  return supports.find(option) != supports.end();
}

const std::vector<StreamRequest> &Device::GetStreamRequests(
    const Capabilities &capability) const {
  if (!Supports(capability)) {
    LOG(FATAL) << "Unsupported capability: " << to_string(capability);
  }
  try {
    auto &&cap_requests = stream_requests_map.at(model_);
    return cap_requests.at(capability);
  } catch (const std::out_of_range &e) {
    LOG(FATAL) << "Stream request of " << capability << " of " << model_
               << " not found";
  }
}

void Device::ConfigStreamRequest(
    const Capabilities &capability, const StreamRequest &request) {
  auto &&requests = GetStreamRequests(capability);
  if (std::find(requests.cbegin(), requests.cend(), request) ==
      requests.cend()) {
    LOG(FATAL) << "Config stream request of " << capability
               << " is not accpected";
  }
  stream_config_requests_[capability] = request;
}

std::shared_ptr<DeviceInfo> Device::GetInfo() const {
  return device_info_;
}

std::string Device::GetInfo(const Info &info) const {
  CHECK_NOTNULL(device_info_);
  switch (info) {
    case Info::DEVICE_NAME: {
      return device_info_->name;
    } break;
    case Info::SERIAL_NUMBER: {
      return device_info_->serial_number;
    } break;
    case Info::FIRMWARE_VERSION: {
      return device_info_->firmware_version.to_string();
    } break;
    case Info::HARDWARE_VERSION: {
      return device_info_->hardware_version.to_string();
    } break;
    case Info::SPEC_VERSION: {
      return device_info_->spec_version.to_string();
    } break;
    case Info::LENS_TYPE: {
      return device_info_->lens_type.to_string();
    } break;
    case Info::IMU_TYPE: {
      return device_info_->imu_type.to_string();
    } break;
    case Info::NOMINAL_BASELINE: {
      return std::to_string(device_info_->nominal_baseline);
    } break;
    default: { LOG(FATAL) << "Unknown device info"; }
  }
}

ImgIntrinsics Device::GetImgIntrinsics() const {
  return img_intrinsics_;
}

ImgExtrinsics Device::GetImgExtrinsics() const {
  return img_extrinsics_;
}

ImuIntrinsics Device::GetImuIntrinsics() const {
  return imu_intrinsics_;
}

ImuExtrinsics Device::GetImuExtrinsics() const {
  return imu_extrinsics_;
}

void Device::SetStreamCallback(
    const Stream &stream, stream_callback_t callback) {
  if (!Supports(stream)) {
    LOG(WARNING) << "Unsupported stream: " << to_string(stream);
    return;
  }
  if (callback) {
    stream_callbacks_[stream] = callback;
  } else {
    stream_callbacks_.erase(stream);
  }
}

void Device::SetMotionCallback(motion_callback_t callback) {
  motion_callback_ = callback;
}

bool Device::HasStreamCallback(const Stream &stream) const {
  try {
    return stream_callbacks_.at(stream) != nullptr;
  } catch (const std::out_of_range &e) {
    return false;
  }
}

bool Device::HasMotionCallback() const {
  return motion_callback_ != nullptr;
}

void Device::Start(const Source &source) {
  if (source == Source::VIDEO_STREAMING) {
    StartVideoStreaming();
  } else if (source == Source::MOTION_TRACKING) {
    StartMotionTracking();
  } else if (source == Source::ALL) {
    Start(Source::VIDEO_STREAMING);
    Start(Source::MOTION_TRACKING);
  } else {
    LOG(FATAL) << "Unsupported source :(";
  }
}

void Device::Stop(const Source &source) {
  if (source == Source::VIDEO_STREAMING) {
    StopVideoStreaming();
  } else if (source == Source::MOTION_TRACKING) {
    StopMotionTracking();
  } else if (source == Source::ALL) {
    Stop(Source::VIDEO_STREAMING);
    Stop(Source::MOTION_TRACKING);
  } else {
    LOG(FATAL) << "Unsupported source :(";
  }
}

void Device::WaitForStreams() {
  CHECK(video_streaming_);
  CHECK_NOTNULL(streams_);
  streams_->WaitForStreams();
}

std::vector<device::StreamData> Device::GetStreamDatas(const Stream &stream) {
  CHECK(video_streaming_);
  CHECK_NOTNULL(streams_);
  std::lock_guard<std::mutex> _(mtx_streams_);
  return streams_->GetStreamDatas(stream);
}

device::StreamData Device::GetLatestStreamData(const Stream &stream) {
  CHECK(video_streaming_);
  CHECK_NOTNULL(streams_);
  std::lock_guard<std::mutex> _(mtx_streams_);
  return streams_->GetLatestStreamData(stream);
}

const StreamRequest &Device::GetStreamRequest(const Capabilities &capability) {
  try {
    return stream_config_requests_.at(capability);
  } catch (const std::out_of_range &e) {
    auto &&requests = GetStreamRequests(capability);
    if (requests.size() == 1) {
      VLOG(2) << "Get the only one stream request of " << capability;
      return requests[0];
    } else {
      LOG(FATAL) << "Please config the stream request of " << capability;
    }
  }
}

void Device::StartVideoStreaming() {
  if (video_streaming_) {
    LOG(WARNING) << "Cannot start video streaming without first stopping it";
    return;
  }

  streams_ = std::make_shared<Streams>(GetKeyStreams());

  // if stream capabilities are supported with subdevices of device_
  /*
  Capabilities stream_capabilities[] = {
    Capabilities::STEREO,
    Capabilities::COLOR,
    Capabilities::DEPTH,
    Capabilities::POINTS,
    Capabilities::FISHEYE,
    Capabilities::INFRARED,
    Capabilities::INFRARED2
  };
  for (auto &&capability : stream_capabilities) {
  }
  */
  if (Supports(Capabilities::STEREO)) {
    // do stream request selection if more than one request of each stream
    auto &&stream_request = GetStreamRequest(Capabilities::STEREO);

    streams_->ConfigStream(Capabilities::STEREO, stream_request);
    uvc::set_device_mode(
        *device_, stream_request.width, stream_request.height,
        static_cast<int>(stream_request.format), stream_request.fps,
        [this](const void *data) {
          std::lock_guard<std::mutex> _(mtx_streams_);
          streams_->PushStream(Capabilities::STEREO, data);
          if (HasStreamCallback(Stream::LEFT)) {
            auto &&stream_data = streams_->stream_datas(Stream::LEFT).back();
            stream_callbacks_.at(Stream::LEFT)(stream_data);
          }
          if (HasStreamCallback(Stream::RIGHT)) {
            auto &&stream_data = streams_->stream_datas(Stream::RIGHT).back();
            stream_callbacks_.at(Stream::RIGHT)(stream_data);
          }
        });
  } else {
    LOG(FATAL) << "Not any stream capabilities are supported by this device";
  }

  uvc::start_streaming(*device_, 0);
  video_streaming_ = true;
}

void Device::StopVideoStreaming() {
  if (!video_streaming_) {
    LOG(WARNING) << "Cannot stop video streaming without first starting it";
    return;
  }
  stop_streaming(*device_);
  video_streaming_ = false;
}

void Device::StartMotionTracking() {
  if (!Supports(Capabilities::IMU)) {
    LOG(FATAL) << "IMU capability is not supported by this device";
  }
  if (motion_tracking_) {
    LOG(WARNING) << "Cannot start motion tracking without first stopping it";
    return;
  }
  // TODO(JohnZhao)
  motion_tracking_ = true;
}

void Device::StopMotionTracking() {
  if (!motion_tracking_) {
    LOG(WARNING) << "Cannot stop motion tracking without first starting it";
    return;
  }
  // TODO(JohnZhao)
  motion_tracking_ = false;
}

void Device::ReadDeviceInfo() {
  // TODO(JohnZhao): Read device info
  device_info_ = std::make_shared<DeviceInfo>();
  device_info_->name = uvc::get_name(*device_);
}

void Device::WriteImgIntrinsics(const ImgIntrinsics &intrinsics) {
  // TODO(JohnZhao): Write img intrinsics
  UNUSED(intrinsics);
}

void Device::WriteImgExtrinsics(const ImgExtrinsics &extrinsics) {
  // TODO(JohnZhao): Write img extrinsics
  UNUSED(extrinsics);
}

void Device::WriteImuIntrinsics(const ImuIntrinsics &intrinsics) {
  // TODO(JohnZhao): Write imu intrinsics
  UNUSED(intrinsics);
}

void Device::WriteImuExtrinsics(const ImuExtrinsics &extrinsics) {
  // TODO(JohnZhao): Write imu extrinsics
  UNUSED(extrinsics);
}

MYNTEYE_END_NAMESPACE