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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Sample/Material/MaterialUtil.h
//! @brief Declares functions in namespace MaterialUtil.
//!
//! @homepage http://www.bornagainproject.org
//! @license GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
// ************************************************************************************************
#ifdef SWIG
#error no need to expose this header to Swig
#endif // SWIG
#ifndef BORNAGAIN_SAMPLE_MATERIAL_MATERIALUTIL_H
#define BORNAGAIN_SAMPLE_MATERIAL_MATERIALUTIL_H
#include "Sample/Material/Admixtures.h"
#include "Sample/Material/Material.h"
//! A number of materials-related helper functions for internal use
namespace MaterialUtil {
//! Function for calculating the reduced potential, used for obtaining the Fresnel coefficients
//! (non-polarized material case)
complex_t ScalarReducedPotential(complex_t n, const R3& k, double n_ref);
//! Function for calculating the reduced potential, used for obtaining the Fresnel coefficients
//! (polarized material case)
SpinMatrix PolarizedReducedPotential(complex_t n, const R3& b_field, const R3& k, double n_ref);
// Utility to compute magnetization correction for reduced potential and scattering length density.
// Used with T = double, complex_t.
template <typename T>
SpinMatrix MagnetizationCorrection(complex_t unit_factor, double magnetic_factor,
const Vec3<T>& polarization);
//! Checks if all non-default materials in _materials_ are of the same type and returns this type.
//! If several types of materials are involved, InvalidMaterialType identifier is returned.
MATERIAL_TYPES checkMaterialTypes(const std::vector<const Material*>& materials);
//! Returns material with averaged properties.
Material averagedMaterial(const std::string& name, const std::vector<double>& weights,
const std::vector<Material>& materials);
//! Returns material with averaged properties.
Material averagedMaterial(const Material& base_mat, const Admixtures& admixtures);
} // namespace MaterialUtil
#endif // BORNAGAIN_SAMPLE_MATERIAL_MATERIALUTIL_H
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