/* -------------------------------------------------------------------------- *
 *                                   OpenMM                                   *
 * -------------------------------------------------------------------------- *
 * This is part of the OpenMM molecular simulation toolkit.                   *
 * See https://openmm.org/development.                                        *
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 * Portions copyright (c) 2008-2021 Stanford University and the Authors.      *
 * Authors: Peter Eastman                                                     *
 * Contributors:                                                              *
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#include "openmm/OpenMMException.h"
#include "openmm/internal/ContextImpl.h"
#include "openmm/internal/RBTorsionForceImpl.h"
#include "openmm/kernels.h"
#include <sstream>

using namespace OpenMM;
using namespace std;

RBTorsionForceImpl::RBTorsionForceImpl(const RBTorsionForce& owner) : owner(owner) {
    forceGroup = owner.getForceGroup();
}

RBTorsionForceImpl::~RBTorsionForceImpl() {
}

void RBTorsionForceImpl::initialize(ContextImpl& context) {
    const System& system = context.getSystem();
    for (int i = 0; i < owner.getNumTorsions(); i++) {
        int particle[4];
        double c0, c1, c2, c3, c4, c5;
        owner.getTorsionParameters(i, particle[0], particle[1], particle[2], particle[3], c0, c1, c2, c3, c4, c5);
        for (int j = 0; j < 4; j++) {
            if (particle[j] < 0 || particle[j] >= system.getNumParticles()) {
                stringstream msg;
                msg << "RBTorsionForce: Illegal particle index for a torsion: ";
                msg << particle[j];
                throw OpenMMException(msg.str());
            }
        }
    }
    kernel = context.getPlatform().createKernel(CalcRBTorsionForceKernel::Name(), context);
    kernel.getAs<CalcRBTorsionForceKernel>().initialize(context.getSystem(), owner);
}

double RBTorsionForceImpl::calcForcesAndEnergy(ContextImpl& context, bool includeForces, bool includeEnergy, int groups) {
    if ((groups&(1<<forceGroup)) != 0)
        return kernel.getAs<CalcRBTorsionForceKernel>().execute(context, includeForces, includeEnergy);
    return 0.0;
}

std::vector<std::string> RBTorsionForceImpl::getKernelNames() {
    return {CalcRBTorsionForceKernel::Name()};
}

void RBTorsionForceImpl::updateParametersInContext(ContextImpl& context) {
    kernel.getAs<CalcRBTorsionForceKernel>().copyParametersToContext(context, owner);
    context.systemChanged();
}
