#ifndef Hadrons_MDistil_PerambFromSolve_hpp_
#define Hadrons_MDistil_PerambFromSolve_hpp_

#include <Hadrons/Global.hpp>
#include <Hadrons/Module.hpp>
#include <Hadrons/ModuleFactory.hpp>
#include <Hadrons/Solver.hpp>
#include <Hadrons/EigenPack.hpp>
#include <Hadrons/A2AVectors.hpp>
#include <Hadrons/DilutedNoise.hpp>

// These are members of Distillation
#include <Hadrons/Modules/MDistil/Distil.hpp>
 
BEGIN_HADRONS_NAMESPACE

/******************************************************************************
 *                         PerambFromSolve                                 *
 ******************************************************************************/
BEGIN_MODULE_NAMESPACE(MDistil)
/*
struct DistilParameters: Serializable {
  GRID_SERIALIZABLE_CLASS_MEMBERS(DistilParameters,
                                  int, TI,
                                  int, LI,
                                  int, nnoise,
                                  int, tsrc,
                                  int, SI,
                                  int, Ns,
                                  int, Nt,
                                  int, Nt_inv)
  DistilParameters() = default;
  template <class ReaderClass> DistilParameters(Reader<ReaderClass>& Reader){read(Reader,"Distil",*this);}
};
*/

class PerambFromSolvePar: Serializable
{
public:
    GRID_SERIALIZABLE_CLASS_MEMBERS(PerambFromSolvePar,
                                    std::string, eigenPack,
                                    std::string, PerambFileName,
                                    std::string, solve,
                                    int, nvec,
                                    DistilParameters, Distil);
};

template <typename FImpl>
class TPerambFromSolve: public Module<PerambFromSolvePar>
{
public:
    FERM_TYPE_ALIASES(FImpl,);
    // constructor
    TPerambFromSolve(const std::string name);
    // destructor
    virtual ~TPerambFromSolve(void);
    // dependency relation
    virtual std::vector<std::string> getInput(void);
    virtual std::vector<std::string> getOutput(void);
    // setup
    virtual void setup(void);
    // execution
    virtual void execute(void);
protected:
	GridCartesian * grid3d; // Owned by me, so I must delete it
	GridCartesian * grid4d;
protected:
	    virtual void Cleanup(void);

};

MODULE_REGISTER_TMP(PerambFromSolve, TPerambFromSolve<FIMPL>, MDistil);

/******************************************************************************
 *                 TPerambFromSolve implementation                             *
 ******************************************************************************/
// constructor /////////////////////////////////////////////////////////////////
template <typename FImpl>
TPerambFromSolve<FImpl>::TPerambFromSolve(const std::string name)
:grid3d{nullptr}, grid4d{nullptr}, Module<PerambFromSolvePar>(name)
{}
//destructor
template <typename FImpl>
TPerambFromSolve<FImpl>::~TPerambFromSolve(void)
{
  Cleanup();
};


// dependencies/products ///////////////////////////////////////////////////////
template <typename FImpl>
std::vector<std::string> TPerambFromSolve<FImpl>::getInput(void)
{
    std::vector<std::string> in;

    in.push_back(par().solve);
    in.push_back(par().eigenPack);
    
    return in;
}

template <typename FImpl>
std::vector<std::string> TPerambFromSolve<FImpl>::getOutput(void)
{
    std::vector<std::string> out = {getName()};
    
    return out;
}

// setup ///////////////////////////////////////////////////////////////////////
template <typename FImpl>
void TPerambFromSolve<FImpl>::setup(void)
{
		  Cleanup();
    
	const int nvec{par().nvec};
    const DistilParameters & Distil{par().Distil};
    const int LI{Distil.LI};
    const int nnoise{Distil.nnoise};
    const int Nt_inv{Distil.Nt_inv};
    const int Ns{Distil.Ns};
    std::array<std::string,6> sIndexNames{"Nt", "nvec", "LI", "nnoise", "Nt_inv", "SI"};

    grid4d = env().getGrid();
        grid3d = MakeLowerDimGrid(grid4d);


    envCreate(Perambulator<SpinVector COMMA 6 COMMA sizeof(Real)>, getName(), 1,
              sIndexNames,Distil.Nt,nvec,Distil.LI,Distil.nnoise,Distil.Nt_inv,Distil.SI);
    envCreate(std::vector<Complex>, getName() + "_noise", 1,
              nvec*Distil.Ns*Distil.Nt*Distil.nnoise);

    envTmp(LatticeColourVector, "result_3d",1,LatticeColourVector(grid3d));
        envTmp(LatticeColourVector, "evec3d",1,LatticeColourVector(grid3d));
	    envTmpLat(LatticeColourVector, "result_nospin");


}

template <typename FImpl>
void TPerambFromSolve<FImpl>::Cleanup(void)
{
	  if( grid3d != nullptr ) {
		      delete grid3d;
		          grid3d = nullptr;
			    }
	    grid4d = nullptr;
}


// execution ///////////////////////////////////////////////////////////////////
template <typename FImpl>
void TPerambFromSolve<FImpl>::execute(void)
{
    const int nvec{par().nvec};
    const DistilParameters & Distil{par().Distil};
    const int LI{Distil.LI};
       const int TI{Distil.TI};
    const int nnoise{Distil.nnoise};
    const int Nt{Distil.Nt};
    const int Nt_inv{Distil.Nt_inv};
    const int tsrc{Distil.tsrc};
    const int Ns{Distil.Ns};
    const bool full_tdil{TI==Nt};
    const bool exact_distillation{full_tdil && LI==nvec};
    auto        &perambulator = envGet(Perambulator<SpinVector COMMA 6 COMMA sizeof(Real)>,
                                       getName());
 auto        &solve       = envGet(std::vector<FermionField>, par().solve);
    auto        &epack   = envGet(Grid::Hadrons::EigenPack<LatticeColourVector>, par().eigenPack);

  envGetTmp(LatticeColourVector, result_nospin);
  envGetTmp(LatticeColourVector, result_3d);
  envGetTmp(LatticeColourVector, evec3d);

  GridCartesian * grid4d = env().getGrid();

  int Ntlocal = grid4d->LocalDimensions()[3];
  int Ntfirst = grid4d->LocalStarts()[3];

    const std::string &PerambFileName{par().PerambFileName};


    for (int inoise = 0; inoise < nnoise; inoise++) {
      for (int dk = 0; dk < LI; dk++) {
        for (int dt = 0; dt < Nt_inv; dt++) {
          for (int ds = 0; ds < Ns; ds++) {
            for (int is = 0; is < Ns; is++) {
              result_nospin = peekSpin(solve[inoise+nnoise*(dk+LI*(dt+Nt_inv*ds))],is);
              for (int t = Ntfirst; t < Ntfirst + Ntlocal; t++) {
                ExtractSliceLocal(result_3d,result_nospin,0,t-Ntfirst,Grid::QCD::Tdir);
                for (int ivec = 0; ivec < nvec; ivec++) {
                  ExtractSliceLocal(evec3d,epack.evec[ivec],0,t,3);
                  pokeSpin(perambulator(t, ivec, dk, inoise,dt,ds),innerProduct(evec3d, result_3d),is);
                  std::cout <<  "perambulator(t, ivec, dk, inoise,dt,ds)(is) = (" << t << "," << ivec << "," << dk << "," << inoise << "," << dt << "," << ds << ")(" << is << ") = " <<  perambulator(t, ivec, dk, inoise,dt,ds)()(is)() << std::endl;
                }
              }
            }
          }
        }
      }
    }

    if(PerambFileName.length())
        perambulator.WriteBinary(PerambFileName + "." + std::to_string(vm().getTrajectory()));
 
}

END_MODULE_NAMESPACE

END_HADRONS_NAMESPACE

#endif // Hadrons_MDistil_PerambFromSolve_hpp_