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

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

Source file: Hadrons/Modules/MSource/Point.hpp

Copyright (C) 2015-2019

Author: Antonin Portelli <antonin.portelli@me.com>
Author: Lanny91 <andrew.lawson@gmail.com>

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 Hadrons_MSource_Point_hpp_
#define Hadrons_MSource_Point_hpp_

#include <Hadrons/Global.hpp>
#include <Hadrons/Module.hpp>
#include <Hadrons/ModuleFactory.hpp>

BEGIN_HADRONS_NAMESPACE

/*
 
 Point source
 ------------
 * src_x = delta_x,position
 
 * options:
 - position: space-separated integer sequence (e.g. "0 1 1 0")
 
 */

/******************************************************************************
 *                                  TPoint                                     *
 ******************************************************************************/
BEGIN_MODULE_NAMESPACE(MSource)

class PointPar: Serializable
{
public:
    GRID_SERIALIZABLE_CLASS_MEMBERS(PointPar,
                                    std::string, position);
};

template <typename FImpl>
class TPoint: public Module<PointPar>
{
public:
    BASIC_TYPE_ALIASES(FImpl,);
public:
    // constructor
    TPoint(const std::string name);
    // destructor
    virtual ~TPoint(void) {};
    // dependency relation
    virtual std::vector<std::string> getInput(void);
    virtual std::vector<std::string> getOutput(void);
protected:
    // setup
    virtual void setup(void);
    // execution
    virtual void execute(void);
};

MODULE_REGISTER_TMP(Point,       TPoint<FIMPL>,        MSource);
MODULE_REGISTER_TMP(ScalarPoint, TPoint<ScalarImplCR>, MSource);

/******************************************************************************
 *                       TPoint template implementation                       *
 ******************************************************************************/
// constructor /////////////////////////////////////////////////////////////////
template <typename FImpl>
TPoint<FImpl>::TPoint(const std::string name)
: Module<PointPar>(name)
{}

// dependencies/products ///////////////////////////////////////////////////////
template <typename FImpl>
std::vector<std::string> TPoint<FImpl>::getInput(void)
{
    std::vector<std::string> in;
    
    return in;
}

template <typename FImpl>
std::vector<std::string> TPoint<FImpl>::getOutput(void)
{
    std::vector<std::string> out = {getName()};
    
    return out;
}

// setup ///////////////////////////////////////////////////////////////////////
template <typename FImpl>
void TPoint<FImpl>::setup(void)
{
    envCreateLat(PropagatorField, getName());
}

// execution ///////////////////////////////////////////////////////////////////
template <typename FImpl>
void TPoint<FImpl>::execute(void)
{
    LOG(Message) << "Creating point source at position [" << par().position
                << "]" << std::endl;

    std::vector<int> position = strToVec<int>(par().position);
    auto             &src     = envGet(PropagatorField, getName());
    SitePropagator   id;
    
    if (position.size() != env().getNd())
    {
        HADRONS_ERROR(Size, "position has " + std::to_string(position.size())
                      + " components (must have " + std::to_string(env().getNd()) + ")");
    }
    id  = 1.;
    src = Zero();
    pokeSite(id, src, position);
}

END_MODULE_NAMESPACE

END_HADRONS_NAMESPACE

#endif // Hadrons_MSource_Point_hpp_