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

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

    Source file: ./lib/qcd/action/fermion/MobiusZolotarevFermion.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_MOBIUS_ZOLOTAREV_FERMION_H
#define  GRID_QCD_MOBIUS_ZOLOTAREV_FERMION_H

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

namespace Grid {

  namespace QCD {

    template<class Impl>
    class MobiusZolotarevFermion : public CayleyFermion5D<Impl>
    {
    public:
     INHERIT_IMPL_TYPES(Impl);
    public:

      virtual void   Instantiatable(void) {};
      // Constructors
       MobiusZolotarevFermion(GaugeField &_Umu,
			      GridCartesian         &FiveDimGrid,
			      GridRedBlackCartesian &FiveDimRedBlackGrid,
			      GridCartesian         &FourDimGrid,
			      GridRedBlackCartesian &FourDimRedBlackGrid,
			      RealD _mass,RealD _M5,
			      RealD b, RealD c,
			      RealD lo, RealD hi,const ImplParams &p= ImplParams()) : 
      
      CayleyFermion5D<Impl>(_Umu,
			    FiveDimGrid,
			    FiveDimRedBlackGrid,
			    FourDimGrid,
			    FourDimRedBlackGrid,_mass,_M5,p)

      {
	RealD eps = lo/hi;

	Approx::zolotarev_data *zdata = Approx::zolotarev(eps,this->Ls,0);
	assert(zdata->n==this->Ls);

	std::cout<<GridLogMessage << "MobiusZolotarevFermion (b="<<b<<",c="<<c<<") with Ls= "<<this->Ls<<" Zolotarev range ["<<lo<<","<<hi<<"]"<<std::endl;
	
	// Call base setter
	this->SetCoefficientsZolotarev(hi,zdata,b,c);
 
	Approx::zolotarev_free(zdata);
      }

    };

  }
}

#endif