// Copyright 2018 Slightech Co., Ltd. All rights reserved.
//
// 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.
#include "mynteye/utils.h"

#include <glog/logging.h>

#include "device/context.h"
#include "device/device.h"

MYNTEYE_BEGIN_NAMESPACE

namespace device {

std::shared_ptr<Device> select() {
  LOG(INFO) << "Detecting MYNT EYE devices";
  Context context;
  auto &&devices = context.devices();

  size_t n = devices.size();
  if (n <= 0) {
    LOG(ERROR) << "No MYNT EYE devices :(";
    return nullptr;
  }

  LOG(INFO) << "MYNT EYE devices:";
  for (size_t i = 0; i < n; i++) {
    auto &&device = devices[i];
    auto &&name = device->GetInfo(Info::DEVICE_NAME);
    LOG(INFO) << "  index: " << i << ", name: " << name;
  }

  std::shared_ptr<Device> device = nullptr;
  if (n <= 1) {
    device = devices[0];
    LOG(INFO) << "Only one MYNT EYE device, select index: 0";
  } else {
    while (true) {
      size_t i;
      LOG(INFO) << "There are " << n << " MYNT EYE devices, select index: ";
      std::cin >> i;
      if (i >= n) {
        LOG(WARNING) << "Index out of range :(";
        continue;
      }
      device = devices[i];
      break;
    }
  }

  return device;
}

}  // namespace device

namespace utils {

float get_real_exposure_time(
    std::int32_t frame_rate, std::uint16_t exposure_time) {
  float real_max = 0;
  switch (frame_rate) {
    case 10:
      real_max = 18;
      break;
    case 15:
      real_max = 18;
      break;
    case 20:
      real_max = 18;
      break;
    case 25:
      real_max = 18;
      break;
    case 30:
      real_max = 18;
      break;
    case 35:
      real_max = 18;
      break;
    case 40:
      real_max = 18;
      break;
    case 45:
      real_max = 18;
      break;
    case 50:
      real_max = 17;
      break;
    case 55:
      real_max = 16.325;
      break;
    case 60:
      real_max = 15;
      break;
    default:
      LOG(ERROR) << "Invalid frame rate: " << frame_rate;
      return exposure_time;
  }
  return exposure_time * real_max / 480.f;
}

}  // namespace utils

MYNTEYE_END_NAMESPACE