#ifndef ORBITAL_MECHANICS_H
#define ORBITAL_MECHANICS_H

#include "physics.h"

struct OrbitalElements {
    union {
        double semi_major_axis;       // for elliptical (e<1) and hyperbolic (e>1)
        double semi_latus_rectum;     // for parabolic (e≈1)
    };
    double eccentricity;
    double true_anomaly;
    double inclination;
    double longitude_of_ascending_node;
    double argument_of_periapsis;
};

void orbital_elements_to_cartesian(OrbitalElements elements, double parent_mass,
                                   Vec3* out_position, Vec3* out_velocity);

#endif