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

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

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

    Copyright (C) 2015

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 */
#ifndef  GRID_QCD_WILSON_COMPRESSOR_H
#define  GRID_QCD_WILSON_COMPRESSOR_H

namespace Grid {
namespace QCD {

  template<class SiteHalfSpinor,class SiteSpinor>
  class WilsonCompressor {
  public:
    int mu;
    int dag;

    WilsonCompressor(int _dag){
      mu=0;
      dag=_dag;
      assert((dag==0)||(dag==1));
    }
    void Point(int p) { 
      mu=p;
    };

    virtual SiteHalfSpinor operator () (const SiteSpinor &in,int dim,int plane,int osite,GridBase *grid) {
      return spinproject(in);
    }

    SiteHalfSpinor spinproject(const SiteSpinor &in)
    {
      SiteHalfSpinor ret;
      int mudag=mu;
      if (!dag) {
	mudag=(mu+Nd)%(2*Nd);
      }
      switch(mudag) {
      case Xp:
	spProjXp(ret,in);
	break;
      case Yp:
	spProjYp(ret,in);
	break;
      case Zp:
	spProjZp(ret,in);
	break;
      case Tp:
	spProjTp(ret,in);
	break;
      case Xm:
	spProjXm(ret,in);
	break;
      case Ym:
	spProjYm(ret,in);
	break;
      case Zm:
	spProjZm(ret,in);
	break;
      case Tm:
	spProjTm(ret,in);
	break;
      default: 
	assert(0);
	break;
      }
      return ret;
    }
  };


}} // namespace close
#endif