///////////////////////////////////////////////////////////////////////////////
//
// File MeshPartitionMetis.cpp
//
// For more information, please see: http://www.nektar.info
//
// The MIT License
//
// Copyright (c) 2006 Division of Applied Mathematics, Brown University (USA),
// Department of Aeronautics, Imperial College London (UK), and Scientific
// Computing and Imaging Institute, University of Utah (USA).
//
// License for the specific language governing rights and limitations under
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
// Description: Metis partitioner interface
//
///////////////////////////////////////////////////////////////////////////////

#include "MeshPartitionMetis.h"

#include <LibUtilities/BasicUtils/Metis.hpp>
#include "LibUtilities/BasicUtils/SessionReader.h"

namespace Nektar
{
namespace LibUtilities
{

    std::string MeshPartitionMetis::className
        = GetMeshPartitionFactory().RegisterCreatorFunction(
            "Metis",
            MeshPartitionMetis::create,
            "Partitioning using the METIS library.");

    std::string MeshPartitionMetis::cmdSwitch
        = SessionReader::RegisterCmdLineFlag("use-metis","","Use METIS for mesh partitioning.");

    MeshPartitionMetis::MeshPartitionMetis(const SessionReaderSharedPtr& pSession)
        : MeshPartition(pSession)
    {

    }

    MeshPartitionMetis::~MeshPartitionMetis()
    {

    }

    void MeshPartitionMetis::PartitionGraphImpl(
            int&                              nVerts,
            int&                              nVertConds,
            Nektar::Array<Nektar::OneD, int>& xadj,
            Nektar::Array<Nektar::OneD, int>& adjcy,
            Nektar::Array<Nektar::OneD, int>& vertWgt,
            Nektar::Array<Nektar::OneD, int>& vertSize,
            int&                              nparts,
            int&                              volume,
            Nektar::Array<Nektar::OneD, int>& part)
    {
        Metis::PartGraphVKway(nVerts, nVertConds, xadj, adjcy, vertWgt, vertSize, nparts, volume, part);
    }
}
}
