/* Copyright (C) 2015 Atsushi Togo */
/* All rights reserved. */

/* Some of these codes were originally parts of spglib, but only develped */
/* and used for phono3py. Therefore these were moved from spglib to */
/* phono3py. This file is part of phonopy. */

/* Redistribution and use in source and binary forms, with or without */
/* modification, are permitted provided that the following conditions */
/* are met: */

/* * Redistributions of source code must retain the above copyright */
/*   notice, this list of conditions and the following disclaimer. */

/* * Redistributions in binary form must reproduce the above copyright */
/*   notice, this list of conditions and the following disclaimer in */
/*   the documentation and/or other materials provided with the */
/*   distribution. */

/* * Neither the name of the phonopy project nor the names of its */
/*   contributors may be used to endorse or promote products derived */
/*   from this software without specific prior written permission. */

/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS */
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#ifndef __triplet_H__
#define __triplet_H__

#include <stddef.h>

#include "recgrid.h"

/* Irreducible triplets of k-points are searched under conservation of */
/* :math:``\mathbf{k}_1 + \mathbf{k}_2 + \mathbf{k}_3 = \mathbf{G}``. */
/* Memory spaces of grid_address[prod(mesh)][3], map_triplets[prod(mesh)] */
/* and map_q[prod(mesh)] are required. rotations are point-group- */
/* operations in real space for which duplicate operations are allowed */
/* in the input. */
long tpl_get_triplets_reciprocal_mesh_at_q(
    long *map_triplets, long *map_q, const long grid_point, const long mesh[3],
    const long is_time_reversal, const long num_rot,
    const long (*rec_rotations)[3][3], const long swappable);
/* Irreducible grid-point-triplets in BZ are stored. */
/* triplets are recovered from grid_point and triplet_weights. */
/* BZ boundary is considered in this recovery. Therefore grid addresses */
/* are given not by grid_address, but by bz_grid_address. */
/* triplets[num_ir_triplets][3] = number of non-zero triplets weights*/
/* Number of ir-triplets is returned. */
long tpl_get_BZ_triplets_at_q(long (*triplets)[3], const long grid_point,
                              const RecgridConstBZGrid *bzgrid,
                              const long *map_triplets);
void tpl_get_integration_weight(
    double *iw, char *iw_zero, const double *frequency_points,
    const long num_band0, const long relative_grid_address[24][4][3],
    const long (*triplets)[3], const long num_triplets,
    const RecgridConstBZGrid *bzgrid, const double *frequencies1,
    const long num_band1, const double *frequencies2, const long num_band2,
    const long tp_type, const long openmp_per_triplets);
void tpl_get_integration_weight_with_sigma(
    double *iw, char *iw_zero, const double sigma, const double sigma_cutoff,
    const double *frequency_points, const long num_band0,
    const long (*triplets)[3], const long num_triplets,
    const double *frequencies, const long num_band, const long tp_type);

long tpl_is_N(const long triplet[3], const long (*bz_grid_addresses)[3]);
void tpl_set_relative_grid_address(long tp_relative_grid_address[2][24][4][3],
                                   const long relative_grid_address[24][4][3],
                                   const long tp_type);

#endif
