#pragma once

#include <array>

namespace fesa::elements {

using Vector12 = std::array<double, 12>;
using Matrix12 = std::array<double, 144>;

struct EulerBeam3DSection {
    double young_modulus;
    double shear_modulus;
    double area;
    double torsion_constant;
    double second_moment_y;
    double second_moment_z;
};

Matrix12 euler_beam_3d_local_stiffness(double length, const EulerBeam3DSection& section);

Vector12 euler_beam_3d_local_end_forces(double length,
                                        const EulerBeam3DSection& section,
                                        const Vector12& local_displacements);

} // namespace fesa::elements