#ifndef Hadrons_MDistil_DistilVectors_hpp_
#define Hadrons_MDistil_DistilVectors_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>

BEGIN_HADRONS_NAMESPACE
/*
template<typename LatticeObj>
class Perambulator : Serializable{
	  // TODO: The next line makes friends across all combinations
	  //     (not much of a problem given all public anyway ...)
	  //      FYI, the bug here was that I forgot that the friend is templated
  template<typename T> friend std::ostream & operator<<(std::ostream &os, const Perambulator<T>& p);
protected:
public:
  GRID_SERIALIZABLE_CLASS_MEMBERS( Perambulator,
                                  std::string,             ID,          // Allows owner to specialise
                                  std::string,             Provenance,  // For info only
                                  std::vector<int>,        dimensions,
                                  std::vector<LatticeObj>, perambulator,
                                  // Following items are redundant, but useful
                                  int,     nd,          // Number of dimensions
                                  size_t,  NumElements); // Number of elements
protected:
  // Constructor common code
  inline void ConstructCommon(const int * Dimensions) {
    assert(nd > 0);
    dimensions.resize(nd);
    NumElements = 1;
    for(int i = 0 ; i < nd ; i++) {
      assert(Dimensions[i] > 0);
      NumElements *= (size_t) Dimensions[i];
      dimensions[i] = Dimensions[i];
    }
    //const LatticeObj perambulatorDefault;
    perambulator.resize(NumElements);//,perambulatorDefault);
  }
public:
  // Constructor with dimensions passed as std::vector<int>
  inline Perambulator(const std::vector<int> & Dimensions)
  : nd {(int) Dimensions.size()} {
    ConstructCommon( &Dimensions[0] ); }
  
  // Constructor with dimensions passed as std::vector<int>
  inline Perambulator(const std::vector<int> & Dimensions, const std::string sID)
  : nd {(int) Dimensions.size()}, ID(sID) {
    ConstructCommon( &Dimensions[0] ); }
  
  // Constructor with dimensions passed as std::vector<int>
  inline Perambulator(const std::vector<int> & Dimensions, const std::string sID, const std::string sProvenance)
  : nd {(int) Dimensions.size()}, ID(sID), Provenance(sProvenance) {
    ConstructCommon( &Dimensions[0] ); }
  
  // Constructor with dimensions passed as individual parameters
  // FYI: The caller is free to ignore the names and use the indices however they see fit
  inline Perambulator(int NumNoise, int NumEvec=1, int NumTime=1, int NumSpin=1, int I_k=1, int I_t=1, int I_s=1) {
    int Dimensions[]={NumNoise,NumEvec,NumTime,NumSpin,I_k,I_t,I_s};
    nd = sizeof(Dimensions)/sizeof(Dimensions[0]);
    while( nd > 1 && Dimensions[nd-1] == 1 )
      nd--;
    ConstructCommon( Dimensions );
  }
  
  inline LatticeObj & operator()(size_t count, const int * Coord) {
    assert( count == nd );
    assert( Coord );
    size_t idx = 0;
    // C memory order (???)
    for( int d = 0 ; d < nd ; d++ ) {
      assert( Coord[d] < dimensions[d] );
      idx *= (size_t) dimensions[d];
      idx += (size_t) Coord[d];
    }
    return perambulator[idx];
  }

  inline LatticeObj & operator()(const std::vector<int> Coord) {
    return operator()(Coord.size(), &Coord[0]);
  }
  
  inline LatticeObj & operator()(int idxNoise, int idxEvec=0, int idxTime=0, int idxSpin=0, int I_k=0, int I_t=0, int I_s=0) {
    int MyIndex[]={idxNoise,idxEvec,idxTime,idxSpin,I_k,I_t,I_s};
    int i = sizeof(MyIndex)/sizeof(MyIndex[0]);
    assert( i >= nd );
    while( i > nd )
      assert(MyIndex[--i] == 0);
    return operator()(i, MyIndex);
  }
};
*/

/******************************************************************************
 *      Class to generate Distillation $\varrho$ and $\varphi$ vectors        *
 ******************************************************************************/
/*
 template <typename FImpl>
 class DistilVectorsFromPerambulator
 {
 public:
   FERM_TYPE_ALIASES(FImpl,);
   SOLVER_TYPE_ALIASES(FImpl,);
 public:
   DistilVectorsFromPerambulator(FMat &action);
   virtual ~DistilVectorsFromPerambulator(void) = default;
   void makeRho(FermionField &rhoOut,
   const FermionField &evec, const Complex &noises);
   void makePhi(FermionField &phiOut,
   const FermionField &evec, const SpinVector &Perambulators);
 private:
   GridBase                                 *fGrid_, *frbGrid_, *gGrid_;
   bool                                     is5d_;
   FermionField                             src_o_, sol_e_, sol_o_, tmp_, tmp5_;
 };

*/


/******************************************************************************
 *            DistilVectorsFromPerambulator template implementation           *
 ******************************************************************************/

/*
template <typename FImpl>
DistilVectorsFromPerambulator<FImpl>::DistilVectorsFromPerambulator(FMat &action)
: action_(action)
, fGrid_(action_.FermionGrid())
, frbGrid_(action_.FermionRedBlackGrid())
, gGrid_(action_.GaugeGrid())
, src_o_(frbGrid_)
, sol_e_(frbGrid_)
, sol_o_(frbGrid_)
, tmp_(frbGrid_)
, tmp5_(fGrid_)
, op_(action_)
{}

template <typename FImpl>
void DistilVectorsFromPerambulator<FImpl>::makeRho(FermionField &rhoOut, const FermionField &evec, const Complex &noises)
{
  // INPUT:::::::::
  Grid::Hadrons::EigenPack<LatticeColourVector> eig4d;
  std::vector<std::vector<std::vector<SpinVector> > > noises;

  // OUTPUT::::::::
  std::vector <LatticeSpinColourVector> sources_tsrc;
  {
    LatticeSpinColourVector vecModel(grid4d);
    sources_tsrc.resize(nnoise*LI*Ns*Nt_inv,vecModel);
  }




  // TEMPORARY:::::::::
  LatticeSpinColourVector tmp2(grid4d);
  LatticeSpinColourVector tmp3d(grid3d);
  LatticeColourVector tmp3d_nospin(grid3d);
  LatticeColourVector tmp_nospin(grid4d);
  LatticeColourVector evec3d(grid3d);

  int vecindex;
  for (int inoise = 0; inoise < nnoise; inoise++) {
    for (int dk = 0; dk < LI; dk++) {
      for (int dt = 0; dt < Nt_inv; dt++) {
        if(full_tdil) dt=tsrc; //TODO: this works for now, as longs as tsrc=0, but will crash otherwise!
        for (int ds = 0; ds < Ns; ds++) {
          vecindex = inoise + nnoise * dk + nnoise * LI * ds + nnoise *LI * Ns*dt;
          sources_tsrc[vecindex] = zero;
          tmp3d_nospin = zero;
          for (int it = dt; it < Nt; it += TI){
            if( it >= Ntfirst && it < Ntfirst + Ntlocal ) {
              for (int ik = dk; ik < nvec; ik += LI){
                for (int is = ds; is < Ns; is += Ns){ //at the moment, full spin dilution is enforced
                  ExtractSliceLocal(evec3d,eig4d.evec[ik],0,it,3);
                  tmp3d_nospin = evec3d * noises[inoise][it][ik]()(is)(); //noises do not have to be a spin vector
                  tmp3d=zero;
                  pokeSpin(tmp3d,tmp3d_nospin,is);
                  tmp2=zero;
#ifdef USE_LOCAL_SLICES
                  InsertSliceLocal(tmp3d,tmp2,0,it-Ntfirst,Grid::QCD::Tdir);
#else
                  InsertSlice(tmp3d,tmp2,it,Grid::QCD::Tdir);
#endif
                  sources_tsrc[vecindex] += tmp2;
                }
              }
            }
          }
        }
      }
    }
  }


}

template <typename FImpl>
void DistilVectorsFromPerambulator<FImpl>::makePhi(FermionField &rhoOut, const FermionField &evec, const SpinVector &perambulator)
{

  // INPUT:::::::::
  Perambulator<SpinVector> perambulator;
  Grid::Hadrons::EigenPack<LatticeColourVector> eig4d;

  // OUTPUT::::::::
  std::vector <LatticeSpinColourVector> sinks_tsrc;
  {
    LatticeSpinColourVector vecModel(grid4d);
    sinks_tsrc.resize(nnoise*LI*Ns*Nt_inv,vecModel);
  }




  // TEMPORARY:::::::::
  LatticeSpinColourVector tmp2(grid4d);
  LatticeSpinColourVector tmp3d(grid3d);
  LatticeColourVector tmp3d_nospin(grid3d);
  LatticeColourVector tmp_nospin(grid4d);
  LatticeColourVector evec3d(grid3d);

  int vecindex;
  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++) {
          vecindex = inoise + nnoise * dk + nnoise * LI * ds + nnoise *LI * Ns*dt;
          sinks_tsrc[vecindex] = zero;
          for (int t = Ntfirst; t < Ntfirst + Ntlocal; t++) {
            sink_tslice=zero;
            for (int ivec = 0; ivec < nvec; ivec++) {
              ExtractSliceLocal(evec3d,eig4d.evec[ivec],0,t,3);
              sink_tslice += evec3d * perambulator(t, ivec, dk, inoise,dt,ds);
            }
#ifdef USE_LOCAL_SLICES
            InsertSliceLocal(sink_tslice,sinks_tsrc[vecindex],0,t-Ntfirst,Grid::QCD::Tdir);
#else
            InsertSlice(sink_tslice,sinks_tsrc[vecindex],t,Grid::QCD::Tdir);
#endif
          }
        }
      }
    }
  }

}


*/


/******************************************************************************
 *                         DistilVectors                                 *
 ******************************************************************************/
BEGIN_MODULE_NAMESPACE(MDistil)

class DistilVectorsPar: Serializable
{
public:
    GRID_SERIALIZABLE_CLASS_MEMBERS(DistilVectorsPar,
		                    std::string, noise,
		                    std::string, perambulator,
		                    std::string, eigenPack,
                                    bool, multiFile);
};

template <typename FImpl>
class TDistilVectors: public Module<DistilVectorsPar>
{
public:
    FERM_TYPE_ALIASES(FImpl,);
public:
    // constructor
    TDistilVectors(const std::string name);
    // destructor
    virtual ~TDistilVectors(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);
};

MODULE_REGISTER_TMP(DistilVectors, TDistilVectors<FIMPL>, MDistil);

/******************************************************************************
 *                 TDistilVectors implementation                             *
 ******************************************************************************/
// constructor /////////////////////////////////////////////////////////////////
template <typename FImpl>
TDistilVectors<FImpl>::TDistilVectors(const std::string name)
: Module<DistilVectorsPar>(name)
{}

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

    in.push_back(par().noise);
    in.push_back(par().perambulator);
    in.push_back(par().eigenPack);

    return in;
}

template <typename FImpl>
std::vector<std::string> TDistilVectors<FImpl>::getOutput(void)
{
    std::vector<std::string> out = {getName() + "_rho", getName() + "_phi"};
    
    return out;
}

// setup ///////////////////////////////////////////////////////////////////////
template <typename FImpl>
void TDistilVectors<FImpl>::setup(void)
{
   auto &noise = envGet(std::vector<std::vector<std::vector<SpinVector>>>, par().noise);
  
   envCreate(std::vector<FermionField>, getName() + "_rho", 1, 
		                    noise.size(), envGetGrid(FermionField));
   envCreate(std::vector<FermionField>, getName() + "_phi", 1, 
                 	            noise.size(), envGetGrid(FermionField)); 

 
  envTmp(LatticeSpinColourVector, "tmp2",1,LatticeSpinColourVector(env().getGrid()));
  envTmp(LatticeColourVector, "tmp_nospin",1,LatticeColourVector(env().getGrid()));
  //GridCartesian * const grid3d;
  //ExtractSlice(grid3d,env().getGrid(),0,3);
  //envTmp(LatticeSpinColourVector, "tmp3d",1,LatticeSpinColourVector(grid3d));
  /*LatticeSpinColourVector tmp3d(grid3d);
  LatticeColourVector tmp3d_nospin(grid3d);
  LatticeColourVector evec3d(grid3d);
  */
}

// execution ///////////////////////////////////////////////////////////////////
template <typename FImpl>
void TDistilVectors<FImpl>::execute(void)
{
   
    auto        &noise     = envGet(std::vector<std::vector<std::vector<SpinVector>>>, par().noise);
    auto        &perambulator   = envGet(std::vector<SpinVector>, par().perambulator);
    //auto        &perambulator   = envGet(Perambulator<SpinVector>, par().noise);
    auto        &epack   = envGet(Grid::Hadrons::EigenPack<LatticeColourVector>, par().eigenPack);
    auto        &rho       = envGet(std::vector<FermionField>, getName() + "_rho");
    auto        &phi       = envGet(std::vector<FermionField>, getName() + "_phi");

}

END_MODULE_NAMESPACE

END_HADRONS_NAMESPACE

#endif // Hadrons_MDistil_DistilVectors_hpp_