/*************************************************************************************

Grid physics library, www.github.com/paboyle/Grid

Source file: ./lib/qcd/hmc/NerscCheckpointer.h

Copyright (C) 2015

Author: paboyle <paboyle@ph.ed.ac.uk>

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 2 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, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

See the full license in the file "LICENSE" in the top level distribution
directory
*************************************************************************************/
/*  END LEGAL */
#ifndef NERSC_CHECKPOINTER
#define NERSC_CHECKPOINTER

#include <iostream>
#include <sstream>
#include <string>

namespace Grid {
namespace QCD {

// Only for Gauge fields
template <class Gimpl>
class NerscHmcCheckpointer : public BaseHmcCheckpointer<Gimpl> {
 private:
  CheckpointerParameters Params;

 public:
  INHERIT_GIMPL_TYPES(Gimpl);  // only for gauge configurations

  NerscHmcCheckpointer(const CheckpointerParameters &Params_) { initialize(Params_); }

  void initialize(const CheckpointerParameters &Params_) {
    Params = Params_;
    Params.format = "IEEE64BIG";  // fixed, overwrite any other choice
  }

  void TrajectoryComplete(int traj, GaugeField &U, GridSerialRNG &sRNG,
                          GridParallelRNG &pRNG) {
    if ((traj % Params.saveInterval) == 0) {
      std::string config, rng;
      this->build_filenames(traj, Params, config, rng);

      int precision32 = 1;
      int tworow = 0;
      NerscIO::writeRNGState(sRNG, pRNG, rng);
      NerscIO::writeConfiguration(U, config, tworow, precision32);
    }
  };

  void CheckpointRestore(int traj, GaugeField &U, GridSerialRNG &sRNG,
                         GridParallelRNG &pRNG) {
    std::string config, rng;
    this->build_filenames(traj, Params, config, rng);

    FieldMetaData header;
    NerscIO::readRNGState(sRNG, pRNG, header, rng);
    NerscIO::readConfiguration(U, header, config);
  };
};
}
}
#endif