#include <random>
#include <thread>

#include "mock_temperature_source.hpp"

namespace djm::device {

MockTemperatureSource::MockTemperatureSource(size_t seed) : generator(seed) {}

std::optional<TemperatureReading> MockTemperatureSource::read(
    std::chrono::milliseconds timeout) {
  if (std::bernoulli_distribution(0.01)(generator)) {
    // reading temperature failed, yikes
    return std::nullopt;
  }

  // determine random time until read occurs
  auto millisLag = std::uniform_int_distribution<>(0, 50)(generator);
  if (millisLag > timeout.count()) {
    return std::nullopt;
  }

  std::this_thread::sleep_for(std::chrono::milliseconds(millisLag));

  std::normal_distribution<> normalDist(0.0, 3.5);

  return TemperatureReading{
      56.7 + normalDist(generator),
      45.6 + normalDist(generator),
      34.5 + normalDist(generator),
      32.1 + normalDist(generator),
  };
}

}  // namespace djm::device