/* -------------------------------------------------------------------------- *
 *                                   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                                                     *
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#include "openmm/OpenMMException.h"
#include "openmm/internal/GBSAOBCForceImpl.h"
#include "openmm/internal/ContextImpl.h"
#include "openmm/internal/Messages.h"
#include "openmm/kernels.h"
#include <vector>

using namespace OpenMM;
using std::vector;

GBSAOBCForceImpl::GBSAOBCForceImpl(const GBSAOBCForce& owner) : owner(owner) {
    forceGroup = owner.getForceGroup();
}

void GBSAOBCForceImpl::initialize(ContextImpl& context) {
    kernel = context.getPlatform().createKernel(CalcGBSAOBCForceKernel::Name(), context);
    if (owner.getNumParticles() != context.getSystem().getNumParticles())
        throw OpenMMException("GBSAOBCForce must have exactly as many particles as the System it belongs to.");
    if (owner.getNonbondedMethod() == GBSAOBCForce::CutoffPeriodic) {
        Vec3 boxVectors[3];
        context.getSystem().getDefaultPeriodicBoxVectors(boxVectors[0], boxVectors[1], boxVectors[2]);
        double cutoff = owner.getCutoffDistance();
        if (cutoff > 0.5*boxVectors[0][0] || cutoff > 0.5*boxVectors[1][1] || cutoff > 0.5*boxVectors[2][2])
            throw OpenMMException("GBSAOBCForce: "+Messages::cutoffTooLarge);
    }
    for (int i = 0; i < owner.getNumParticles(); i++) {
        double charge, radius, scalingFactor;
        owner.getParticleParameters(i, charge, radius, scalingFactor);
        if (radius <= 0)
            throw OpenMMException("GBSAOBCForce: particle radius must be positive");
        if (scalingFactor <= 0)
            throw OpenMMException("GBSAOBCForce: particle scaling factor must be positive");
    }
    kernel.getAs<CalcGBSAOBCForceKernel>().initialize(context.getSystem(), owner);
}

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

std::vector<std::string> GBSAOBCForceImpl::getKernelNames() {
    return {CalcGBSAOBCForceKernel::Name()};
}

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