data_status.hpp

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#pragma once
 
#include "ffi_core.hpp"
 
#include <cmath>
#include <optional>
 
namespace tempoch {
 
enum class TimeDataSource : int {
  Bundled = 0,
  RuntimeCache = 1,
  Override = 2,
};
 
struct DataHorizons {
  std::optional<double> eop_start_mjd;
  std::optional<double> eop_observed_end_mjd;
  std::optional<double> eop_end_mjd;
  double modern_delta_t_observed_end_mjd;
  double delta_t_prediction_horizon_mjd;
};
 
struct TimeDataStatus {
  DataHorizons horizons;
  TimeDataSource source;
};
 
inline TimeDataStatus time_data_status() {
  TempochDataHorizons raw{};
  check_status(tempoch_time_data_status(&raw), "tempoch::time_data_status");
 
  auto opt = [](double v) -> std::optional<double> {
    return std::isnan(v) ? std::nullopt : std::optional<double>(v);
  };
 
  TimeDataStatus status;
  status.horizons.eop_start_mjd = opt(raw.eop_start_mjd);
  status.horizons.eop_observed_end_mjd = opt(raw.eop_observed_end_mjd);
  status.horizons.eop_end_mjd = opt(raw.eop_end_mjd);
  status.horizons.modern_delta_t_observed_end_mjd = raw.modern_delta_t_observed_end_mjd;
  status.horizons.delta_t_prediction_horizon_mjd = raw.delta_t_prediction_horizon_mjd;
  status.source = static_cast<TimeDataSource>(raw.source);
  return status;
}
 
} // namespace tempoch