/*
 * Div.hpp, part of Hadrons (https://github.com/aportelli/Hadrons)
 *
 * Copyright (C) 2015 - 2023
 *
 * Author: Antonin Portelli <antonin.portelli@me.com>
 * Author: Peter Boyle <paboyle@ph.ed.ac.uk>
 * Author: Simon Bürger <simon.buerger@rwth-aachen.de>
 *
 * Hadrons 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.
 *
 * Hadrons 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 Hadrons.  If not, see <http://www.gnu.org/licenses/>.
 *
 * See the full license in the file "LICENSE" in the top level distribution 
 * directory.
 */

/*  END LEGAL */
#ifndef Hadrons_MScalarSUN_Div_hpp_
#define Hadrons_MScalarSUN_Div_hpp_

#include <Hadrons/Global.hpp>
#include <Hadrons/Module.hpp>
#include <Hadrons/ModuleFactory.hpp>
#include <Hadrons/Modules/MScalarSUN/Utils.hpp>
#include <Hadrons/Serialization.hpp>

BEGIN_HADRONS_NAMESPACE

/******************************************************************************
 *                       Divergence of a vector field                         *
 ******************************************************************************/
BEGIN_MODULE_NAMESPACE(MScalarSUN)

class DivPar: Serializable
{
public:
    GRID_SERIALIZABLE_CLASS_MEMBERS(DivPar,
                                    std::vector<std::string>, op,
                                    DiffType,                 type,
                                    std::string,              output);
};

class DivResult: Serializable
{
public:
    GRID_SERIALIZABLE_CLASS_MEMBERS(DivResult,
                                    DiffType, type,
                                    Complex,  value);
};

template <typename SImpl>
class TDiv: public Module<DivPar>
{
public:
    typedef typename SImpl::Field        Field;
    typedef typename SImpl::ComplexField ComplexField;
public:
    // constructor
    TDiv(const std::string name);
    // destructor
    virtual ~TDiv(void) {};
    // dependency relation
    virtual std::vector<std::string> getInput(void);
    virtual std::vector<std::string> getOutput(void);
    // setup
    virtual void setup(void);
    // execution
    virtual void execute(void);
};

MODULE_REGISTER_TMP(DivSU2, TDiv<ScalarNxNAdjImplR<2>>, MScalarSUN);
MODULE_REGISTER_TMP(DivSU3, TDiv<ScalarNxNAdjImplR<3>>, MScalarSUN);
MODULE_REGISTER_TMP(DivSU4, TDiv<ScalarNxNAdjImplR<4>>, MScalarSUN);
MODULE_REGISTER_TMP(DivSU5, TDiv<ScalarNxNAdjImplR<5>>, MScalarSUN);
MODULE_REGISTER_TMP(DivSU6, TDiv<ScalarNxNAdjImplR<6>>, MScalarSUN);

/******************************************************************************
 *                           TDiv implementation                              *
 ******************************************************************************/
// constructor /////////////////////////////////////////////////////////////////
template <typename SImpl>
TDiv<SImpl>::TDiv(const std::string name)
: Module<DivPar>(name)
{}

// dependencies/products ///////////////////////////////////////////////////////
template <typename SImpl>
std::vector<std::string> TDiv<SImpl>::getInput(void)
{
    return par().op;
}

template <typename SImpl>
std::vector<std::string> TDiv<SImpl>::getOutput(void)
{
    return {getName(), getName()+"_sum"};
}

// setup ///////////////////////////////////////////////////////////////////////
template <typename SImpl>
void TDiv<SImpl>::setup()
{
    if (par().op.size() != env().getNd())
    {
        HADRONS_ERROR(Size, "the number of components differs from number of dimensions");
    }
    envCreateLat(ComplexField, getName());
    envCreate(HadronsSerializable, getName()+"_sum", 1, 0);
}

// execution ///////////////////////////////////////////////////////////////////
template <typename SImpl>
void TDiv<SImpl>::execute(void)
{
    const auto nd = env().getNd();

    LOG(Message) << "Computing the " << par().type << " divergence of [";
    for (unsigned int mu = 0; mu < nd; ++mu)
    {
        std::cout << "'" << par().op[mu] << ((mu == nd - 1) ? "']" : "', ");
    }
    std::cout << std::endl;

    auto &div = envGet(ComplexField, getName());
    div = Zero();
    for (unsigned int mu = 0; mu < nd; ++mu)
    {
        auto &op = envGet(ComplexField, par().op[mu]);
        dmuAcc(div, op, mu, par().type);
    }

    DivResult r;
    r.type  = par().type;
    r.value = TensorRemove(sum(div));
    saveResult(par().output, "div", r);
    envGet(HadronsSerializable, getName()+"_sum") = r;
}

END_MODULE_NAMESPACE

END_HADRONS_NAMESPACE

#endif // Hadrons_MScalarSUN_Div_hpp_