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

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

    Source file: ./lib/qcd/action/fermion/WilsonFermion5D.cc

    Copyright (C) 2015

Author: Azusa Yamaguchi <ayamaguc@staffmail.ed.ac.uk>
Author: Peter Boyle <pabobyle@ph.ed.ac.uk>
Author: Peter Boyle <paboyle@ph.ed.ac.uk>
Author: Peter Boyle <peterboyle@Peters-MacBook-Pro-2.local>
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 */
#include <Grid.h>
#include <PerfCount.h>

namespace Grid {
namespace QCD {
  
// S-direction is INNERMOST and takes no part in the parity.
const std::vector<int> WilsonFermion5DStatic::directions   ({1,2,3,4, 1, 2, 3, 4});
const std::vector<int> WilsonFermion5DStatic::displacements({1,1,1,1,-1,-1,-1,-1});

  // 5d lattice for DWF.
template<class Impl>
WilsonFermion5D<Impl>::WilsonFermion5D(GaugeField &_Umu,
               GridCartesian         &FiveDimGrid,
               GridRedBlackCartesian &FiveDimRedBlackGrid,
               GridCartesian         &FourDimGrid,
               GridRedBlackCartesian &FourDimRedBlackGrid,
               RealD _M5,const ImplParams &p) :
  Kernels(p),
  _FiveDimGrid        (&FiveDimGrid),
  _FiveDimRedBlackGrid(&FiveDimRedBlackGrid),
  _FourDimGrid        (&FourDimGrid),
  _FourDimRedBlackGrid(&FourDimRedBlackGrid),
  Stencil    (_FiveDimGrid,npoint,Even,directions,displacements),
  StencilEven(_FiveDimRedBlackGrid,npoint,Even,directions,displacements), // source is Even
  StencilOdd (_FiveDimRedBlackGrid,npoint,Odd ,directions,displacements), // source is Odd
  M5(_M5),
  Umu(_FourDimGrid),
  UmuEven(_FourDimRedBlackGrid),
  UmuOdd (_FourDimRedBlackGrid),
  Lebesgue(_FourDimGrid),
  LebesgueEvenOdd(_FourDimRedBlackGrid)
{
  if (Impl::LsVectorised) { 

    int nsimd = Simd::Nsimd();
    
    // some assertions
    assert(FiveDimGrid._ndimension==5);
    assert(FiveDimRedBlackGrid._ndimension==5);
    assert(FiveDimRedBlackGrid._checker_dim==1); // Don't checker the s direction
    assert(FourDimGrid._ndimension==4);

    // Dimension zero of the five-d is the Ls direction
    Ls=FiveDimGrid._fdimensions[0];
    assert(FiveDimGrid._processors[0]         ==1);
    assert(FiveDimGrid._simd_layout[0]        ==nsimd);

    assert(FiveDimRedBlackGrid._fdimensions[0]==Ls);
    assert(FiveDimRedBlackGrid._processors[0] ==1);
    assert(FiveDimRedBlackGrid._simd_layout[0]==nsimd);

    // Other dimensions must match the decomposition of the four-D fields 
    for(int d=0;d<4;d++){
      assert(FiveDimRedBlackGrid._fdimensions[d+1]==FourDimGrid._fdimensions[d]);
      assert(FiveDimRedBlackGrid._processors[d+1] ==FourDimGrid._processors[d]);
      
      assert(FourDimGrid._simd_layout[d]=1);
      assert(FourDimRedBlackGrid._simd_layout[d]=1);
      assert(FiveDimRedBlackGrid._simd_layout[d+1]==1);

      assert(FiveDimGrid._fdimensions[d+1]        ==FourDimGrid._fdimensions[d]);
      assert(FiveDimGrid._processors[d+1]         ==FourDimGrid._processors[d]);
      assert(FiveDimGrid._simd_layout[d+1]        ==FourDimGrid._simd_layout[d]);
    }

  } else {

    // some assertions
    assert(FiveDimGrid._ndimension==5);
    assert(FourDimGrid._ndimension==4);
    assert(FiveDimRedBlackGrid._ndimension==5);
    assert(FourDimRedBlackGrid._ndimension==4);
    assert(FiveDimRedBlackGrid._checker_dim==1);
    
    // Dimension zero of the five-d is the Ls direction
    Ls=FiveDimGrid._fdimensions[0];
    assert(FiveDimRedBlackGrid._fdimensions[0]==Ls);
    assert(FiveDimRedBlackGrid._processors[0] ==1);
    assert(FiveDimRedBlackGrid._simd_layout[0]==1);
    assert(FiveDimGrid._processors[0]         ==1);
    assert(FiveDimGrid._simd_layout[0]        ==1);
    
    // Other dimensions must match the decomposition of the four-D fields 
    for(int d=0;d<4;d++){
      assert(FourDimRedBlackGrid._fdimensions[d]  ==FourDimGrid._fdimensions[d]);
      assert(FiveDimRedBlackGrid._fdimensions[d+1]==FourDimGrid._fdimensions[d]);
      
      assert(FourDimRedBlackGrid._processors[d]   ==FourDimGrid._processors[d]);
      assert(FiveDimRedBlackGrid._processors[d+1] ==FourDimGrid._processors[d]);
      
      assert(FourDimRedBlackGrid._simd_layout[d]  ==FourDimGrid._simd_layout[d]);
      assert(FiveDimRedBlackGrid._simd_layout[d+1]==FourDimGrid._simd_layout[d]);
      
      assert(FiveDimGrid._fdimensions[d+1]        ==FourDimGrid._fdimensions[d]);
      assert(FiveDimGrid._processors[d+1]         ==FourDimGrid._processors[d]);
      assert(FiveDimGrid._simd_layout[d+1]        ==FourDimGrid._simd_layout[d]);
    }
  }
    
  // Allocate the required comms buffer
  ImportGauge(_Umu);
}
  /*
template<class Impl>
WilsonFermion5D<Impl>::WilsonFermion5D(int simd,GaugeField &_Umu,
               GridCartesian         &FiveDimGrid,
               GridRedBlackCartesian &FiveDimRedBlackGrid,
               GridCartesian         &FourDimGrid,
               RealD _M5,const ImplParams &p) :
{
  int nsimd = Simd::Nsimd();

  // some assertions
  assert(FiveDimGrid._ndimension==5);
  assert(FiveDimRedBlackGrid._ndimension==5);
  assert(FiveDimRedBlackGrid._checker_dim==0); // Checkerboard the s-direction
  assert(FourDimGrid._ndimension==4);

  // Dimension zero of the five-d is the Ls direction
  Ls=FiveDimGrid._fdimensions[0];
  assert(FiveDimGrid._processors[0]         ==1);
  assert(FiveDimGrid._simd_layout[0]        ==nsimd);

  assert(FiveDimRedBlackGrid._fdimensions[0]==Ls);
  assert(FiveDimRedBlackGrid._processors[0] ==1);
  assert(FiveDimRedBlackGrid._simd_layout[0]==nsimd);

  // Other dimensions must match the decomposition of the four-D fields 
  for(int d=0;d<4;d++){
    assert(FiveDimRedBlackGrid._fdimensions[d+1]==FourDimGrid._fdimensions[d]);
    assert(FiveDimRedBlackGrid._processors[d+1] ==FourDimGrid._processors[d]);

    assert(FourDimGrid._simd_layout[d]=1);
    assert(FiveDimRedBlackGrid._simd_layout[d+1]==1);

    assert(FiveDimGrid._fdimensions[d+1]        ==FourDimGrid._fdimensions[d]);
    assert(FiveDimGrid._processors[d+1]         ==FourDimGrid._processors[d]);
    assert(FiveDimGrid._simd_layout[d+1]        ==FourDimGrid._simd_layout[d]);
  }

  {
  }
}  
  */
     
template<class Impl>
void WilsonFermion5D<Impl>::Report(void)
{
    std::vector<int> latt = GridDefaultLatt();          
    RealD volume = Ls;  for(int mu=0;mu<Nd;mu++) volume=volume*latt[mu];
    RealD NP = _FourDimGrid->_Nprocessors;

  if ( DhopCalls > 0 ) {
    std::cout << GridLogMessage << "#### Dhop calls report " << std::endl;
    std::cout << GridLogMessage << "WilsonFermion5D Number of Dhop Calls     : " << DhopCalls  << std::endl;
    std::cout << GridLogMessage << "WilsonFermion5D Total Communication time : " << DhopCommTime
              << " us" << std::endl;
    std::cout << GridLogMessage << "WilsonFermion5D CommTime/Calls           : "
              << DhopCommTime / DhopCalls << " us" << std::endl;
    std::cout << GridLogMessage << "WilsonFermion5D Total Compute time       : "
              << DhopComputeTime << " us" << std::endl;
    std::cout << GridLogMessage << "WilsonFermion5D ComputeTime/Calls        : "
              << DhopComputeTime / DhopCalls << " us" << std::endl;

    RealD mflops = 1344*volume*DhopCalls/DhopComputeTime;
    std::cout << GridLogMessage << "Average mflops/s per call                : " << mflops << std::endl;
    std::cout << GridLogMessage << "Average mflops/s per call per node       : " << mflops/NP << std::endl;

   }

  if ( DerivCalls > 0 ) {
  std::cout << GridLogMessage << "#### Deriv calls report "<< std::endl;
  std::cout << GridLogMessage << "WilsonFermion5D Number of Deriv Calls    : " <<DerivCalls <<std::endl;
  std::cout << GridLogMessage << "WilsonFermion5D Total Communication time : " <<DerivCommTime <<" us"<<std::endl;
  std::cout << GridLogMessage << "WilsonFermion5D CommTime/Calls           : " <<DerivCommTime/DerivCalls<<" us" <<std::endl;
  std::cout << GridLogMessage << "WilsonFermion5D Total Compute time       : " <<DerivComputeTime <<" us"<<std::endl;
  std::cout << GridLogMessage << "WilsonFermion5D ComputeTime/Calls        : " <<DerivComputeTime/DerivCalls<<" us" <<std::endl;
  std::cout << GridLogMessage << "WilsonFermion5D Total Dhop Compute time  : " <<DerivDhopComputeTime <<" us"<<std::endl;
  std::cout << GridLogMessage << "WilsonFermion5D Dhop ComputeTime/Calls   : " <<DerivDhopComputeTime/DerivCalls<<" us" <<std::endl;



  RealD mflops = 144*volume*DerivCalls/DerivDhopComputeTime;
  std::cout << GridLogMessage << "Average mflops/s per call                : " << mflops << std::endl;
  std::cout << GridLogMessage << "Average mflops/s per call per node       : " << mflops/NP << std::endl;

  }

  if (DerivCalls > 0 || DhopCalls > 0){
  std::cout << GridLogMessage << "WilsonFermion5D Stencil"<<std::endl;  Stencil.Report();
  std::cout << GridLogMessage << "WilsonFermion5D StencilEven"<<std::endl;  StencilEven.Report();
  std::cout << GridLogMessage << "WilsonFermion5D StencilOdd"<<std::endl;  StencilOdd.Report();
  }
}

template<class Impl>
void WilsonFermion5D<Impl>::ZeroCounters(void) {
  DhopCalls       = 0;
  DhopCommTime    = 0;
  DhopComputeTime = 0;

  DerivCalls       = 0;
  DerivCommTime    = 0;
  DerivComputeTime = 0;
  DerivDhopComputeTime = 0;

  Stencil.ZeroCounters();
  StencilEven.ZeroCounters();
  StencilOdd.ZeroCounters();
}


template<class Impl>
void WilsonFermion5D<Impl>::ImportGauge(const GaugeField &_Umu)
{
  GaugeField HUmu(_Umu._grid);
  HUmu = _Umu*(-0.5);
  Impl::DoubleStore(GaugeGrid(),Umu,HUmu);
  pickCheckerboard(Even,UmuEven,Umu);
  pickCheckerboard(Odd ,UmuOdd,Umu);
}
template<class Impl>
void WilsonFermion5D<Impl>::DhopDir(const FermionField &in, FermionField &out,int dir5,int disp)
{
  int dir = dir5-1; // Maps to the ordering above in "directions" that is passed to stencil
                    // we drop off the innermost fifth dimension
  //  assert( (disp==1)||(disp==-1) );
  //  assert( (dir>=0)&&(dir<4) ); //must do x,y,z or t;

  Compressor compressor(DaggerNo);
  Stencil.HaloExchange(in,compressor);
  
  int skip = (disp==1) ? 0 : 1;

  int dirdisp = dir+skip*4;
  int gamma   = dir+(1-skip)*4;

  assert(dirdisp<=7);
  assert(dirdisp>=0);

PARALLEL_FOR_LOOP
  for(int ss=0;ss<Umu._grid->oSites();ss++){
    for(int s=0;s<Ls;s++){
      int sU=ss;
      int sF = s+Ls*sU; 
      Kernels::DiracOptDhopDir(Stencil,Umu,Stencil.comm_buf,sF,sU,in,out,dirdisp,gamma);
    }
  }
};

template<class Impl>
void WilsonFermion5D<Impl>::DerivInternal(StencilImpl & st,
            DoubledGaugeField & U,
            GaugeField &mat,
            const FermionField &A,
            const FermionField &B,
            int dag)
{
  DerivCalls++;
  assert((dag==DaggerNo) ||(dag==DaggerYes));

  conformable(st._grid,A._grid);
  conformable(st._grid,B._grid);

  Compressor compressor(dag);
  
  FermionField Btilde(B._grid);
  FermionField Atilde(B._grid);

  DerivCommTime-=usecond();
  st.HaloExchange(B,compressor);
  DerivCommTime+=usecond();

  Atilde=A;

  DerivComputeTime-=usecond();
  for (int mu = 0; mu < Nd; mu++) {
    ////////////////////////////////////////////////////////////////////////
    // Flip gamma if dag
    ////////////////////////////////////////////////////////////////////////
    int gamma = mu;
    if (!dag) gamma += Nd;

    ////////////////////////
    // Call the single hop
    ////////////////////////

    DerivDhopComputeTime -= usecond();
    PARALLEL_FOR_LOOP
    for (int sss = 0; sss < U._grid->oSites(); sss++) {
      for (int s = 0; s < Ls; s++) {
        int sU = sss;
        int sF = s + Ls * sU;

        assert(sF < B._grid->oSites());
        assert(sU < U._grid->oSites());

        Kernels::DiracOptDhopDir(st, U, st.comm_buf, sF, sU, B, Btilde, mu,
                                 gamma);

        ////////////////////////////
        // spin trace outer product
        ////////////////////////////
      }
    }
    DerivDhopComputeTime += usecond();
    Impl::InsertForce5D(mat, Btilde, Atilde, mu);
  }
  DerivComputeTime += usecond();
}

template<class Impl>
void WilsonFermion5D<Impl>::DhopDeriv(      GaugeField &mat,
              const FermionField &A,
              const FermionField &B,
              int dag)
{
  conformable(A._grid,FermionGrid());  
  conformable(A._grid,B._grid);
  conformable(GaugeGrid(),mat._grid);

  mat.checkerboard = A.checkerboard;

  DerivInternal(Stencil,Umu,mat,A,B,dag);
}

template<class Impl>
void WilsonFermion5D<Impl>::DhopDerivEO(GaugeField &mat,
          const FermionField &A,
          const FermionField &B,
          int dag)
{
  conformable(A._grid,FermionRedBlackGrid());
  conformable(GaugeRedBlackGrid(),mat._grid);
  conformable(A._grid,B._grid);

  assert(B.checkerboard==Odd);
  assert(A.checkerboard==Even);
  mat.checkerboard = Even;

  DerivInternal(StencilOdd,UmuEven,mat,A,B,dag);
}


template<class Impl>
void WilsonFermion5D<Impl>::DhopDerivOE(GaugeField &mat,
          const FermionField &A,
          const FermionField &B,
          int dag)
{
  conformable(A._grid,FermionRedBlackGrid());
  conformable(GaugeRedBlackGrid(),mat._grid);
  conformable(A._grid,B._grid);

  assert(B.checkerboard==Even);
  assert(A.checkerboard==Odd);
  mat.checkerboard = Odd;

  DerivInternal(StencilEven,UmuOdd,mat,A,B,dag);
}

template<class Impl>
void WilsonFermion5D<Impl>::DhopInternal(StencilImpl & st, LebesgueOrder &lo,
           DoubledGaugeField & U,
           const FermionField &in, FermionField &out,int dag)
{
  DhopCalls++;
  //  assert((dag==DaggerNo) ||(dag==DaggerYes));
  Compressor compressor(dag);

  int LLs = in._grid->_rdimensions[0];
  
  DhopCommTime-=usecond();
  st.HaloExchange(in,compressor);
  DhopCommTime+=usecond();
  
  DhopComputeTime-=usecond();
  // Dhop takes the 4d grid from U, and makes a 5d index for fermion
  if (dag == DaggerYes) {
    PARALLEL_FOR_LOOP
    for (int ss = 0; ss < U._grid->oSites(); ss++) {
      int sU = ss;
      int sF = LLs * sU;
      Kernels::DiracOptDhopSiteDag(st, lo, U, st.comm_buf, sF, sU, LLs, 1, in,
                                   out);
    }
  } else {
    PARALLEL_FOR_LOOP
    for (int ss = 0; ss < U._grid->oSites(); ss++) {
      int sU = ss;
      int sF = LLs * sU;
      Kernels::DiracOptDhopSite(st, lo, U, st.comm_buf, sF, sU, LLs, 1, in,
                                out);
    }
  }
  DhopComputeTime+=usecond();
}


template<class Impl>
void WilsonFermion5D<Impl>::DhopOE(const FermionField &in, FermionField &out,int dag)
{
  conformable(in._grid,FermionRedBlackGrid());    // verifies half grid
  conformable(in._grid,out._grid); // drops the cb check

  assert(in.checkerboard==Even);
  out.checkerboard = Odd;

  DhopInternal(StencilEven,LebesgueEvenOdd,UmuOdd,in,out,dag);
}
template<class Impl>
void WilsonFermion5D<Impl>::DhopEO(const FermionField &in, FermionField &out,int dag)
{
  conformable(in._grid,FermionRedBlackGrid());    // verifies half grid
  conformable(in._grid,out._grid); // drops the cb check

  assert(in.checkerboard==Odd);
  out.checkerboard = Even;

  DhopInternal(StencilOdd,LebesgueEvenOdd,UmuEven,in,out,dag);
}
template<class Impl>
void WilsonFermion5D<Impl>::Dhop(const FermionField &in, FermionField &out,int dag)
{
  conformable(in._grid,FermionGrid()); // verifies full grid
  conformable(in._grid,out._grid);

  out.checkerboard = in.checkerboard;

  DhopInternal(Stencil,Lebesgue,Umu,in,out,dag);
}
template<class Impl>
void WilsonFermion5D<Impl>::DW(const FermionField &in, FermionField &out,int dag)
{
  out.checkerboard=in.checkerboard;
  Dhop(in,out,dag); // -0.5 is included
  axpy(out,4.0-M5,in,out);
}

FermOpTemplateInstantiate(WilsonFermion5D);
GparityFermOpTemplateInstantiate(WilsonFermion5D);
  
}}