/* -------------------------------------------------------------------------- *
 *                                   OpenMM                                   *
 * -------------------------------------------------------------------------- *
 * This is part of the OpenMM molecular simulation toolkit.                   *
 * See https://openmm.org/development.                                        *
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 * Portions copyright (c) 2010-2024 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/CustomAngleForceImpl.h"
#include "openmm/kernels.h"
#include <sstream>

using namespace OpenMM;
using std::map;
using std::pair;
using std::vector;
using std::set;
using std::string;
using std::stringstream;

CustomAngleForceImpl::CustomAngleForceImpl(const CustomAngleForce& owner) : owner(owner) {
    forceGroup = owner.getForceGroup();
}

CustomAngleForceImpl::~CustomAngleForceImpl() {
}

void CustomAngleForceImpl::initialize(ContextImpl& context) {
    kernel = context.getPlatform().createKernel(CalcCustomAngleForceKernel::Name(), context);

    // Check for errors in the specification of bonds.
    const System& system = context.getSystem();
    vector<double> parameters;
    int numParameters = owner.getNumPerAngleParameters();
    for (int i = 0; i < owner.getNumAngles(); i++) {
        int particle[3];
        owner.getAngleParameters(i, particle[0], particle[1], particle[2], parameters);
        for (int j = 0; j < 3; j++) {
            if (particle[j] < 0 || particle[j] >= system.getNumParticles()) {
                stringstream msg;
                msg << "CustomAngleForce: Illegal particle index for an angle: ";
                msg << particle[j];
                throw OpenMMException(msg.str());
            }
        }
        if (parameters.size() != numParameters) {
            stringstream msg;
            msg << "CustomAngleForce: Wrong number of parameters for angle ";
            msg << i;
            throw OpenMMException(msg.str());
        }
    }
    kernel.getAs<CalcCustomAngleForceKernel>().initialize(context.getSystem(), owner);
}

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

vector<string> CustomAngleForceImpl::getKernelNames() {
    return {CalcCustomAngleForceKernel::Name()};
}

map<string, double> CustomAngleForceImpl::getDefaultParameters() {
    map<string, double> parameters;
    for (int i = 0; i < owner.getNumGlobalParameters(); i++)
        parameters[owner.getGlobalParameterName(i)] = owner.getGlobalParameterDefaultValue(i);
    return parameters;
}

void CustomAngleForceImpl::updateParametersInContext(ContextImpl& context, int firstAngle, int lastAngle) {
    kernel.getAs<CalcCustomAngleForceKernel>().copyParametersToContext(context, owner, firstAngle, lastAngle);
    context.systemChanged();
}
