#pragma once

/*  MOUNT CONTROL COMPONENTS LIBRARY  */


/*  ASTROMETRY ENGINE BASED ON ERFA-LIBRARY  */

#include <chrono>
// #include <cmath>


#include "mcc_astrom_iers.h"
#include "mcc_mount_coord.h"

namespace mcc::astrom::erfa
{

#include <erfa.h>
#include <erfam.h>

class MccMountAstromEngineERFA
{
public:
    typedef int engine_err_t;

    // meteo parameters (to compute refraction)
    struct meteo_t {
        typedef double temp_t;
        typedef double humid_t;
        typedef double press_t;

        temp_t temperature;  // Temperature in C
        humid_t humidity;    // humidity in % ([0.0, 1.0])
        press_t pressure;    // atmospheric presure in hPa=mB
    };

    struct engine_state_t {
        meteo_t meteo{.temperature = 0.0, .humidity = 0.5, .pressure = 1010.0};

        double wavelength = 0.55;  // observed wavelength in mkm

        MccAngleLAT lat = "00:00:00"_dms;  // site latitude
        MccAngleLON lon = "00:00:00"_dms;  // site longitude

        mcc::astrom::iers::MccLeapSeconds _leapSeconds{};
        mcc::astrom::iers::MccIersBulletinA _bulletinA{};
    };

    typedef std::chrono::system_clock::time_point time_point_t;

    struct juldate_t {
        static constexpr double MJD0 = ERFA_DJM0;
        double mjd{51544.5};  // J2000.0
    };

    typedef MccAngle coord_t;
    typedef MccAngle gst_t;
    typedef MccAngle pa_t;
    typedef double eo_t;

    struct refract_result_t {
        double refa, refb;
    };

protected:
    engine_state_t _currentState;
};

}  // namespace mcc::astrom::erfa