/* Copyright (c) 2019, Anthony Latorre <tlatorre at uchicago>
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option)
 * any later version.

 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.

 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */

#ifndef OPTICS_H
#define OPTICS_H

#include "dict.h"

/* Global error string when optics_init() returns -1. */
extern char optics_err[256];

/* Initialize the optics data by reading in the RSPR bank and precomputing the
 * average absorption and scattering tables. */
int optics_init(dict *db);

/* Functions for computing the index of refraction. */
double get_index(double p, double wavelength, double T);
double get_index_snoman_h2o(double wavelength);
double get_index_snoman_d2o(double wavelength);

/* Functions for computing the probability that a photon is not absorbed or
 * scattered after a certain distance. */
double get_fabs_d2o(double x);
double get_fabs_h2o(double x);
double get_fabs_acrylic(double x);
double get_fsct_d2o(double x);
double get_fsct_h2o(double x);

/* Functions for computing the absorption and scattering length as a funcion of
 * wavelength. */
double get_absorption_length_snoman_d2o(double wavelength);
double get_absorption_length_snoman_h2o(double wavelength);
double get_absorption_length_snoman_acrylic(double wavelength);
double get_rayleigh_scattering_length_snoman_d2o(double wavelength);
double get_rayleigh_scattering_length_snoman_h2o(double wavelength);

#endif