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

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

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

Copyright (C) 2016

Author: Guido Cossu <guido.cossu@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 ILDG_CHECKPOINTER
#define ILDG_CHECKPOINTER

#ifdef HAVE_LIME

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

NAMESPACE_BEGIN(Grid);

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

public:
  INHERIT_GIMPL_TYPES(Implementation);

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

  void initialize(const CheckpointerParameters &Params_) {
    Params = Params_;

    // check here that the format is valid
    int ieee32big = (Params.format == std::string("IEEE32BIG"));
    int ieee32    = (Params.format == std::string("IEEE32"));
    int ieee64big = (Params.format == std::string("IEEE64BIG"));
    int ieee64    = (Params.format == std::string("IEEE64"));

    if (!(ieee64big || ieee32 || ieee32big || ieee64)) {
      std::cout << GridLogError << "Unrecognized file format " << Params.format
                << std::endl;
      std::cout << GridLogError
                << "Allowed: IEEE32BIG | IEEE32 | IEEE64BIG | IEEE64"
                << std::endl;

      exit(1);
    }
  }

  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);
      
      uint32_t nersc_csum,scidac_csuma,scidac_csumb;
      BinaryIO::writeRNG(sRNG, pRNG, rng, 0,nersc_csum,scidac_csuma,scidac_csumb);
      IldgWriter _IldgWriter;
      _IldgWriter.open(config);
      _IldgWriter.writeConfiguration(U, traj, config, config);
      _IldgWriter.close();

      std::cout << GridLogMessage << "Written ILDG Configuration on " << config
                << " checksum " << std::hex 
		<< nersc_csum<<"/"
		<< scidac_csuma<<"/"
		<< scidac_csumb
		<< std::dec << std::endl;
    }
  };

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

    uint32_t nersc_csum,scidac_csuma,scidac_csumb;
    BinaryIO::readRNG(sRNG, pRNG, rng, 0,nersc_csum,scidac_csuma,scidac_csumb);

    FieldMetaData header;
    IldgReader _IldgReader;
    _IldgReader.open(config);
    _IldgReader.readConfiguration(U,header);  // format from the header
    _IldgReader.close();

    std::cout << GridLogMessage << "Read ILDG Configuration from " << config
              << " checksum " << std::hex 
	      << nersc_csum<<"/"
	      << scidac_csuma<<"/"
	      << scidac_csumb
	      << std::dec << std::endl;
  };
};

NAMESPACE_END(Grid);

#endif  // HAVE_LIME
#endif  // ILDG_CHECKPOINTER