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

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

Source file: ./tests/Test_hmc_WilsonFermionGauge.cc

Copyright (C) 2015

Author: Peter Boyle <pabobyle@ph.ed.ac.uk>
Author: neo <cossu@post.kek.jp>
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 */
#include <Grid/Grid.h>

using namespace std;
using namespace Grid;
using namespace Grid::QCD;

namespace Grid {
namespace QCD {

//Change here the type of reader
typedef Grid::TextReader InputFileReader; 


class HMCRunnerParameters : Serializable {
 public:
  GRID_SERIALIZABLE_CLASS_MEMBERS(HMCRunnerParameters,
                                  double, beta,
                                  int, MDsteps,
                                  double, TrajectorLength,
                                  int, SaveInterval,
                                  std::string, format,
                                  std::string, conf_prefix,
                                  std::string, rng_prefix,
                                  std::string, serial_seeds,
                                  std::string, parallel_seeds,
                                  );

  HMCRunnerParameters() {}
};


// Derive from the BinaryHmcRunner (templated for gauge fields)
class HmcRunner : public BinaryHmcRunner {
 public:
    HMCRunnerParameters HMCPar;
    void BuildTheAction(int argc, char **argv)

  {
    // Typedefs to simplify notation
    typedef WilsonGaugeActionR GaugeAction;
    typedef WilsonImplR ImplPolicy;
    typedef WilsonFermionR FermionAction;
    typedef typename FermionAction::FermionField FermionField;

    // this can be simplified too. MakeDefaultGrid(Nd)
    UGrid = SpaceTimeGrid::makeFourDimGrid(
        GridDefaultLatt(), 
        GridDefaultSimd(Nd, vComplex::Nsimd()), 
        GridDefaultMpi());
    

    // Gauge action
    std::cout << GridLogMessage << "Beta: " << HMCPar.beta << std::endl;
    GaugeAction Waction(HMCPar.beta);

    // Collect actions
    ActionLevel<Field> Level1(1);
    Level1.push_back(&Waction);
    TheAction.push_back(Level1);

    // Add observables
    // options for checkpointers
    //BinaryHmcCheckpointer
    //ILDGHmcCheckpointer
    //NerscHmcCheckpointer
    NerscHmcCheckpointer<BinaryHmcRunner::ImplPolicy> Checkpoint(
        HMCPar.conf_prefix, HMCPar.rng_prefix, HMCPar.SaveInterval, HMCPar.format);
    // Can implement also a specific function in the hmcrunner
    // AddCheckpoint (...) that takes the same parameters + a string/tag
    // defining the type of the checkpointer
    // with tags can be implemented by overloading and no ifs
    // Then force all checkpoint to have few common functions
    // return an object that is then passed to the Run function

    PlaquetteLogger<BinaryHmcRunner::ImplPolicy> PlaqLog(
        std::string("Plaquette"));
    ObservablesList.push_back(&PlaqLog);
    ObservablesList.push_back(&Checkpoint);

    Run(argc, argv, Checkpoint);  // no smearing
  };
};
}
}

int main(int argc, char **argv) {
  Grid_init(&argc, &argv);

  int threads = GridThread::GetThreads();
  std::cout << GridLogMessage << "Grid is setup to use " << threads
            << " threads" << std::endl;

  HmcRunner TheHMC;
  // make input file name general
  InputFileReader Reader("input.wilson_gauge.params");
  read(Reader, "HMC", TheHMC.HMCPar);

  std::cout << GridLogMessage << TheHMC.HMCPar << std::endl;

  // Seeds for the random number generators
  // generalise
  std::vector<int> SerSeed = strToVec<int>(TheHMC.HMCPar.serial_seeds);
  std::vector<int> ParSeed = strToVec<int>(TheHMC.HMCPar.parallel_seeds);

  TheHMC.RNGSeeds(SerSeed, ParSeed);

  TheHMC.MDparameters.set(TheHMC.HMCPar.MDsteps, TheHMC.HMCPar.TrajectorLength);

  TheHMC.BuildTheAction(argc, argv);

  Grid_finalize();
}