/*
 * This file is part of the GROMACS molecular simulation package.
 *
 * Copyright 1991- The GROMACS Authors
 * and the project initiators Erik Lindahl, Berk Hess and David van der Spoel.
 * Consult the AUTHORS/COPYING files and https://www.gromacs.org for details.
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 */
#ifndef GMX_FILEIO_CONFIO_H
#define GMX_FILEIO_CONFIO_H

#include <filesystem>

#include "gromacs/math/vectypes.h"
#include "gromacs/utility/basedefinitions.h"

/* For reading coordinate files it is assumed that enough memory
 * has been allocated beforehand.
 */
struct gmx_mtop_t;
struct t_atoms;
struct t_symtab;
struct t_topology;
enum class PbcType : int;

void write_sto_conf_indexed(const std::filesystem::path& outfile,
                            const char*                  title,
                            const t_atoms*               atoms,
                            const rvec                   x[],
                            const rvec*                  v,
                            PbcType                      pbcType,
                            const matrix                 box,
                            int                          nindex,
                            int                          index[]);
/* like write_sto_conf, but indexed */

void write_sto_conf(const std::filesystem::path& outfile,
                    const char*                  title,
                    const t_atoms*               atoms,
                    const rvec                   x[],
                    const rvec*                  v,
                    PbcType                      pbcType,
                    const matrix                 box);
/* write atoms, x, v (if .gro and not NULL) and box (if not NULL)
 * to an STO (.gro or .pdb) file */

void write_sto_conf_mtop(const std::filesystem::path& outfile,
                         const char*                  title,
                         const gmx_mtop_t&            mtop,
                         const rvec                   x[],
                         const rvec*                  v,
                         PbcType                      pbcType,
                         const matrix                 box);
/* As write_sto_conf, but uses a gmx_mtop_t struct */

/*! \brief Read a configuration and, when available, a topology from a tpr or structure file.
 *
 * When reading from a tpr file, the complete topology is returned in \p mtop.
 * When reading from a structure file, only the atoms struct in \p mtop contains data.
 *
 * \param[in]     infile        Input file name
 * \param[out]    haveTopology  true when a topology was read and stored in mtop
 * \param[out]    mtop          The topology, either complete or only atom data
 * \param[out]    pbcType       Enum reporting the type of PBC
 * \param[in,out] x             Coordinates will be stored when *x!=NULL
 * \param[in,out] v             Velocities will be stored when *v!=NULL
 * \param[out]    box           Box dimensions
 */
void readConfAndTopology(const std::filesystem::path& infile,
                         bool*                        haveTopology,
                         gmx_mtop_t*                  mtop,
                         PbcType*                     pbcType,
                         rvec**                       x,
                         rvec**                       v,
                         matrix                       box);

/*! \brief Read a configuration from a structure file.
 *
 * This should eventually be superseded by TopologyInformation
 *
 * \param[in]     infile        Input file name
 * \param[out]    symtab        The symbol table
 * \param[out]    name          The title of the molecule, e.g. from pdb TITLE record
 * \param[out]    atoms         The global t_atoms struct
 * \param[out]    pbcType       Enum reporting the type of PBC
 * \param[in,out] x             Coordinates will be stored when *x!=NULL
 * \param[in,out] v             Velocities will be stored when *v!=NULL
 * \param[out]    box           Box dimensions
 */
void readConfAndAtoms(const std::filesystem::path& infile,
                      t_symtab*                    symtab,
                      char**                       name,
                      t_atoms*                     atoms,
                      PbcType*                     pbcType,
                      rvec**                       x,
                      rvec**                       v,
                      matrix                       box);

/*! \brief Read a configuration and, when available, a topology from a tpr or structure file.
 *
 * Deprecated, superseded by readConfAndTopology().
 * When \p requireMasses = TRUE, this routine must return a topology with
 * mass data. Masses are either read from a tpr input file, or otherwise
 * looked up from the mass database, and when such lookup fails a fatal error
 * results.
 * When \p requireMasses = FALSE, masses will still be read from tpr input and
 * their presence is signaled with the \p haveMass flag in t_atoms of \p top.
 *
 * \param[in]     infile        Input file name
 * \param[out]    top           The topology, either complete or only atom data. Caller is
 *                              responsible for calling done_top().
 * \param[out]    pbcType       Enum reporting the type of PBC
 * \param[in,out] x             Coordinates will be stored when *x!=NULL
 * \param[in,out] v             Velocities will be stored when *v!=NULL
 * \param[out]    box           Box dimensions
 * \param[in]     requireMasses Require masses to be present, either from tpr or from the mass
 *                              database
 * \returns if a topology is available
 */
gmx_bool read_tps_conf(const std::filesystem::path& infile,
                       struct t_topology*           top,
                       PbcType*                     pbcType,
                       rvec**                       x,
                       rvec**                       v,
                       matrix                       box,
                       gmx_bool                     requireMasses);

#endif
