///////////////////////////////////////////////////////////////////////////////
//
// File: FilterCheckpoint.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).
//
// 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: Outputs solution fields during time-stepping.
//
///////////////////////////////////////////////////////////////////////////////

#include <SolverUtils/Filters/FilterCheckpoint.h>

namespace Nektar::SolverUtils
{
std::string FilterCheckpoint::className =
    GetFilterFactory().RegisterCreatorFunction("Checkpoint",
                                               FilterCheckpoint::create);

FilterCheckpoint::FilterCheckpoint(
    const LibUtilities::SessionReaderSharedPtr &pSession,
    const std::weak_ptr<EquationSystem> &pEquation, const ParamMap &pParams)
    : Filter(pSession, pEquation)
{
    // OutputFile
    auto it = pParams.find("OutputFile");
    if (it == pParams.end())
    {
        m_outputFile = m_session->GetSessionName();
    }
    else
    {
        ASSERTL0(it->second.length() > 0, "Empty parameter 'OutputFile'.");
        m_outputFile = it->second;
    }

    // OutputFrequency
    it = pParams.find("OutputFrequency");
    ASSERTL0(it != pParams.end(), "Missing parameter 'OutputFrequency'.");
    LibUtilities::Equation equ(m_session->GetInterpreter(), it->second);
    m_outputFrequency = round(equ.Evaluate());

    // Time after which we need to write checkfiles
    it = pParams.find("OutputStartTime");
    if (it == pParams.end())
    {
        m_outputStartTime = 0;
    }
    else
    {
        LibUtilities::Equation equ(m_session->GetInterpreter(), it->second);
        m_outputStartTime = equ.Evaluate();
    }

    m_fld = LibUtilities::FieldIO::CreateDefault(pSession);
}

FilterCheckpoint::~FilterCheckpoint()
{
}

void FilterCheckpoint::v_Initialise(
    const Array<OneD, const MultiRegions::ExpListSharedPtr> &pFields,
    const NekDouble &time)
{
    m_index       = 0;
    m_outputIndex = 0;
    v_Update(pFields, time);
}

void FilterCheckpoint::v_Update(
    const Array<OneD, const MultiRegions::ExpListSharedPtr> &pFields,
    const NekDouble &time)
{

    if (m_index++ % m_outputFrequency > 0 || time < m_outputStartTime)
    {
        return;
    }

    std::stringstream vOutputFilename;
    vOutputFilename << m_outputFile << "_" << m_outputIndex << ".chk";

    std::vector<LibUtilities::FieldDefinitionsSharedPtr> FieldDef =
        pFields[0]->GetFieldDefinitions();
    std::vector<std::vector<NekDouble>> FieldData(FieldDef.size());

    // copy Data into FieldData and set variable
    for (int j = 0; j < pFields.size(); ++j)
    {
        for (int i = 0; i < FieldDef.size(); ++i)
        {
            // Could do a search here to find correct variable
            FieldDef[i]->m_fields.push_back(m_session->GetVariable(j));
            pFields[0]->AppendFieldData(FieldDef[i], FieldData[i],
                                        pFields[j]->UpdateCoeffs());
        }
    }
    m_fld->Write(vOutputFilename.str(), FieldDef, FieldData);
    m_outputIndex++;
}

void FilterCheckpoint::v_Finalise(
    [[maybe_unused]] const Array<OneD, const MultiRegions::ExpListSharedPtr>
        &pFields,
    [[maybe_unused]] const NekDouble &time)
{
}

bool FilterCheckpoint::v_IsTimeDependent()
{
    return true;
}
} // namespace Nektar::SolverUtils
