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

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

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

Copyright (C) 2017

Author: Peter Boyle <pabobyle@ph.ed.ac.uk>
Author: Peter Boyle <paboyle@ph.ed.ac.uk>
Author: David Murphy <dmurphy@phys.columbia.edu>

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 */
#pragma once

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

NAMESPACE_BEGIN(Grid);

template<class Impl>
class DomainWallEOFAFermion : public AbstractEOFAFermion<Impl>
{
public:
  INHERIT_IMPL_TYPES(Impl);

public:
  // Modified (0,Ls-1) and (Ls-1,0) elements of Mooee
  // for red-black preconditioned Shamir EOFA
  Coeff_t dm;
  Coeff_t dp;

  virtual void Instantiatable(void) {};

  // EOFA-specific operations
  virtual void  Omega      (const FermionField& in, FermionField& out, int sign, int dag);
  virtual void  Dtilde     (const FermionField& in, FermionField& out);
  virtual void  DtildeInv  (const FermionField& in, FermionField& out);

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

  // half checkerboard operations
  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);

  virtual void   M5D       (const FermionField& psi, FermionField& chi);
  virtual void   M5Ddag    (const FermionField& psi, FermionField& chi);

  /////////////////////////////////////////////////////
  // Instantiate different versions depending on Impl
  /////////////////////////////////////////////////////
  void M5D(const FermionField& psi, const FermionField& phi, FermionField& chi,
	   Vector<Coeff_t>& lower, Vector<Coeff_t>& diag, Vector<Coeff_t>& upper);

  void M5Ddag(const FermionField& psi, const FermionField& phi, FermionField& chi,
	      Vector<Coeff_t>& lower, Vector<Coeff_t>& diag, Vector<Coeff_t>& upper);

  virtual void RefreshShiftCoefficients(RealD new_shift);

  // Constructors
  DomainWallEOFAFermion(GaugeField& _Umu, GridCartesian& FiveDimGrid, GridRedBlackCartesian& FiveDimRedBlackGrid,
			GridCartesian& FourDimGrid, GridRedBlackCartesian& FourDimRedBlackGrid,
			RealD _mq1, RealD _mq2, RealD _mq3, RealD _shift, int pm,
			RealD _M5, const ImplParams& p=ImplParams());

protected:
  void SetCoefficientsInternal(RealD zolo_hi, Vector<Coeff_t>& gamma, RealD b, RealD c);
};

NAMESPACE_END(Grid);