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

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

    Source file: ./lib/qcd/action/fermion/PartialFractionFermion5D.h

    Copyright (C) 2015

Author: Peter Boyle <pabobyle@ph.ed.ac.uk>
Author: Peter Boyle <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 */
#ifndef  GRID_QCD_PARTIAL_FRACTION_H
#define  GRID_QCD_PARTIAL_FRACTION_H

#include <Grid/qcd/action/fermion/WilsonFermion5D.h>

NAMESPACE_BEGIN(Grid);

template<class Impl>
class PartialFractionFermion5D : public WilsonFermion5D<Impl>
{
public:
  INHERIT_IMPL_TYPES(Impl);

  const int part_frac_chroma_convention=1;

  void   Meooe_internal(const FermionField &in, FermionField &out,int dag);
  void   Mooee_internal(const FermionField &in, FermionField &out,int dag);
  void   MooeeInv_internal(const FermionField &in, FermionField &out,int dag);
  void   M_internal(const FermionField &in, FermionField &out,int dag);

  // override multiply
  virtual RealD  M    (const FermionField &in, FermionField &out);
  virtual RealD  Mdag (const FermionField &in, FermionField &out);

  // half checkerboard operaions
  virtual void   Meooe       (const FermionField &in, FermionField &out);
  virtual void   MeooeDag    (const FermionField &in, FermionField &out);
  virtual void   Mooee       (const FermionField &in, FermionField &out);
  virtual void   MooeeDag    (const FermionField &in, FermionField &out);
  virtual void   MooeeInv    (const FermionField &in, FermionField &out);
  virtual void   MooeeInvDag (const FermionField &in, FermionField &out);

  // force terms; five routines; default to Dhop on diagonal
  virtual void MDeriv  (GaugeField &mat,const FermionField &U,const FermionField &V,int dag);
  virtual void MoeDeriv(GaugeField &mat,const FermionField &U,const FermionField &V,int dag);
  virtual void MeoDeriv(GaugeField &mat,const FermionField &U,const FermionField &V,int dag);

  virtual void   Instantiatable(void) =0; // ensure no make-eee

  // Efficient support for multigrid coarsening
  virtual void  Mdir (const FermionField &in, FermionField &out,int dir,int disp);

  // Constructors
  PartialFractionFermion5D(GaugeField &_Umu,
			   GridCartesian         &FiveDimGrid,
			   GridRedBlackCartesian &FiveDimRedBlackGrid,
			   GridCartesian         &FourDimGrid,
			   GridRedBlackCartesian &FourDimRedBlackGrid,
			   RealD _mass,RealD M5,const ImplParams &p= ImplParams());

protected:

  virtual void SetCoefficientsTanh(Approx::zolotarev_data *zdata,RealD scale);
  virtual void SetCoefficientsZolotarev(RealD zolo_hi,Approx::zolotarev_data *zdata);

  // Part frac
  RealD mass;
  RealD dw_diag;
  RealD R;
  RealD amax;
  RealD scale;
  std::vector<double> p; 
  std::vector<double> q;

};

NAMESPACE_END(Grid);

#endif