#ifndef Hadrons_Baryon_hpp_
#define Hadrons_Baryon_hpp_

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

BEGIN_HADRONS_NAMESPACE

/******************************************************************************
 *                               Baryon                                       *
 ******************************************************************************/
BEGIN_MODULE_NAMESPACE(MContraction)

class BaryonPar: Serializable
{
public:
    GRID_SERIALIZABLE_CLASS_MEMBERS(BaryonPar,
                                    std::string, q1,
                                    std::string, q2,
                                    std::string, q3,
                                    std::string, output);
};

template <typename FImpl1, typename FImpl2, typename FImpl3>
class TBaryon: public Module<BaryonPar>
{
public:
    TYPE_ALIASES(FImpl1, 1);
    TYPE_ALIASES(FImpl2, 2);
    TYPE_ALIASES(FImpl3, 3);
    class Result: Serializable
    {
    public:
        GRID_SERIALIZABLE_CLASS_MEMBERS(Result,
                                        std::vector<std::vector<std::vector<Complex>>>, corr);
    };
public:
    // constructor
    TBaryon(const std::string name);
    // destructor
    virtual ~TBaryon(void) = default;
    // dependency relation
    virtual std::vector<std::string> getInput(void);
    virtual std::vector<std::string> getOutput(void);
    // execution
    virtual void execute(void);
};

typedef TBaryon<FIMPL, FIMPL, FIMPL> Baryon;

/******************************************************************************
 *                         TBaryon implementation                             *
 ******************************************************************************/
// constructor /////////////////////////////////////////////////////////////////
template <typename FImpl1, typename FImpl2, typename FImpl3>
TBaryon<FImpl1, FImpl2, FImpl3>::TBaryon(const std::string name)
: Module<BaryonPar>(name)
{}

// dependencies/products ///////////////////////////////////////////////////////
template <typename FImpl1, typename FImpl2, typename FImpl3>
std::vector<std::string> TBaryon<FImpl1, FImpl2, FImpl3>::getInput(void)
{
    std::vector<std::string> input = {par().q1, par().q2, par().q3};
    
    return input;
}

template <typename FImpl1, typename FImpl2, typename FImpl3>
std::vector<std::string> TBaryon<FImpl1, FImpl2, FImpl3>::getOutput(void)
{
    std::vector<std::string> out = {getName()};
    
    return out;
}

// execution ///////////////////////////////////////////////////////////////////
template <typename FImpl1, typename FImpl2, typename FImpl3>
void TBaryon<FImpl1, FImpl2, FImpl3>::execute(void)
{
    LOG(Message) << "Computing baryon contractions '" << getName() << "' using"
                 << " quarks '" << par().q1 << "', '" << par().q2 << "', and '"
                 << par().q3 << "'" << std::endl;
    
    XmlWriter             writer(par().output);
    PropagatorField1      &q1 = *env().template getObject<PropagatorField1>(par().q1);
    PropagatorField2      &q2 = *env().template getObject<PropagatorField2>(par().q2);
    PropagatorField3      &q3 = *env().template getObject<PropagatorField3>(par().q2);
    LatticeComplex        c(env().getGrid());
    Result                result;
    
    // FIXME: do contractions
    
    write(writer, "meson", result);
}

END_MODULE_NAMESPACE

MODULE_REGISTER_NS(Baryon, MContraction);

END_HADRONS_NAMESPACE

#endif // Hadrons_Baryon_hpp_