/* ----------------------------------------------------------------------
   LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
   https://www.lammps.org/, Sandia National Laboratories
   LAMMPS development team: developers@lammps.org

   Copyright (2003) Sandia Corporation.  Under the terms of Contract
   DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
   certain rights in this software.  This software is distributed under
   the GNU General Public License.

   See the README file in the top-level LAMMPS directory.
------------------------------------------------------------------------- */

/* ----------------------------------------------------------------------
   Contributing author: Richard Berger (Temple U)
------------------------------------------------------------------------- */

#ifdef LAMMPS_ZSTD

#include "domain.h"

#include "dump_atom_zstd.h"
#include "error.h"
#include "file_writer.h"
#include "update.h"

#include <cstring>

using namespace LAMMPS_NS;

DumpAtomZstd::DumpAtomZstd(LAMMPS *lmp, int narg, char **arg) : DumpAtom(lmp, narg, arg)
{
  if (!compressed) error->all(FLERR, "Dump atom/zstd only writes compressed files");
}

/* ----------------------------------------------------------------------
   generic opening of a dump file
   ASCII or binary or compressed
   some derived classes override this function
------------------------------------------------------------------------- */

void DumpAtomZstd::openfile()
{
  // single file, already opened, so just return

  if (singlefile_opened) return;
  if (multifile == 0) singlefile_opened = 1;

  // if one file per timestep, replace '*' with current timestep

  char *filecurrent = filename;
  if (multiproc) filecurrent = multiname;

  if (multifile) {
    filecurrent = utils::strdup(utils::star_subst(filecurrent, update->ntimestep, padflag));
    if (maxfiles > 0) {
      if (numfiles < maxfiles) {
        nameslist[numfiles] = utils::strdup(filecurrent);
        ++numfiles;
      } else {
        if (remove(nameslist[fileidx]) != 0) {
          error->warning(FLERR, "Could not delete {}", nameslist[fileidx]);
        }
        delete[] nameslist[fileidx];
        nameslist[fileidx] = utils::strdup(filecurrent);
        fileidx = (fileidx + 1) % maxfiles;
      }
    }
  }

  // each proc with filewriter = 1 opens a file

  if (filewriter) {
    try {
      writer.open(filecurrent, append_flag);
    } catch (FileWriterException &e) {
      error->one(FLERR, e.what());
    }
  }

  // delete string with timestep replaced

  if (multifile) delete[] filecurrent;
}

/* ---------------------------------------------------------------------- */

void DumpAtomZstd::write_header(bigint ndump)
{
  std::string header;

  if ((multiproc) || (!multiproc && me == 0)) {
    if (unit_flag && !unit_count) {
      ++unit_count;
      header = fmt::format("ITEM: UNITS\n{}\n", update->unit_style);
    }

    if (time_flag) { header += fmt::format("ITEM: TIME\n{0:.16g}\n", compute_time()); }

    header += fmt::format("ITEM: TIMESTEP\n{}\n", update->ntimestep);
    header += fmt::format("ITEM: NUMBER OF ATOMS\n{}\n", ndump);
    if (domain->triclinic == 0) {
      header += fmt::format("ITEM: BOX BOUNDS {}\n", boundstr);
      header += fmt::format("{0:-1.16e} {1:-1.16e}\n", boxxlo, boxxhi);
      header += fmt::format("{0:-1.16e} {1:-1.16e}\n", boxylo, boxyhi);
      header += fmt::format("{0:-1.16e} {1:-1.16e}\n", boxzlo, boxzhi);
    } else {
      header += fmt::format("ITEM: BOX BOUNDS xy xz yz {}\n", boundstr);
      header += fmt::format("{0:-1.16e} {1:-1.16e} {2:-1.16e}\n", boxxlo, boxxhi, boxxy);
      header += fmt::format("{0:-1.16e} {1:-1.16e} {2:-1.16e}\n", boxylo, boxyhi, boxxz);
      header += fmt::format("{0:-1.16e} {1:-1.16e} {2:-1.16e}\n", boxzlo, boxzhi, boxyz);
    }
    header += fmt::format("ITEM: ATOMS {}\n", columns);

    (void) writer.write(header.c_str(), header.length());
  }
}

/* ---------------------------------------------------------------------- */

void DumpAtomZstd::write_data(int n, double *mybuf)
{
  if (buffer_flag == 1) {
    (void) writer.write(mybuf, n);
  } else {
    constexpr size_t VBUFFER_SIZE = 256;
    char vbuffer[VBUFFER_SIZE];
    int m = 0;
    for (int i = 0; i < n; i++) {
      int written = 0;
      if (image_flag == 1) {
        written = snprintf(vbuffer, VBUFFER_SIZE, format, static_cast<tagint>(mybuf[m]),
                           static_cast<int>(mybuf[m + 1]), mybuf[m + 2], mybuf[m + 3], mybuf[m + 4],
                           static_cast<int>(mybuf[m + 5]), static_cast<int>(mybuf[m + 6]),
                           static_cast<int>(mybuf[m + 7]));
      } else {
        written =
            snprintf(vbuffer, VBUFFER_SIZE, format, static_cast<tagint>(mybuf[m]),
                     static_cast<int>(mybuf[m + 1]), mybuf[m + 2], mybuf[m + 3], mybuf[m + 4]);
      }
      if (written > 0) {
        (void) writer.write(vbuffer, written);
      } else if (written < 0) {
        error->one(FLERR, "Error while writing dump atom/gz output");
      }

      m += size_one;
    }
  }
}

/* ---------------------------------------------------------------------- */

void DumpAtomZstd::write()
{
  DumpAtom::write();
  if (filewriter) {
    if (multifile) {
      writer.close();
    } else {
      if (flush_flag && writer.isopen()) { writer.flush(); }
    }
  }
}

/* ---------------------------------------------------------------------- */

int DumpAtomZstd::modify_param(int narg, char **arg)
{
  int consumed = DumpAtom::modify_param(narg, arg);
  if (consumed == 0) {
    try {
      if (strcmp(arg[0], "checksum") == 0) {
        if (narg < 2) error->all(FLERR, "Illegal dump_modify command");
        writer.setChecksum(utils::logical(FLERR, arg[1], false, lmp) == 1);
        return 2;
      } else if (strcmp(arg[0], "compression_level") == 0) {
        if (narg < 2) error->all(FLERR, "Illegal dump_modify command");
        writer.setCompressionLevel(utils::inumeric(FLERR, arg[1], false, lmp));
        return 2;
      }
    } catch (FileWriterException &e) {
      error->one(FLERR, "Illegal dump_modify command: {}", e.what());
    }
  }
  return consumed;
}

#endif
