///////////////////////////////////////////////////////////////////////////////
//
// File: FilterThresholdMin.h
//
// 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 time when solution first drops below a threshold value.
//
///////////////////////////////////////////////////////////////////////////////

#ifndef NEKTAR_SOLVERUTILS_FILTERS_FILTERTHRESHOLDMIN_H
#define NEKTAR_SOLVERUTILS_FILTERS_FILTERTHRESHOLDMIN_H

#include <SolverUtils/Filters/Filter.h>

namespace Nektar::SolverUtils
{

class FilterThresholdMin : public Filter
{
public:
    friend class MemoryManager<FilterThresholdMin>;

    /// Creates an instance of this class
    static FilterSharedPtr create(
        const LibUtilities::SessionReaderSharedPtr &pSession,
        const std::weak_ptr<EquationSystem> &pEquation, const ParamMap &pParams)
    {
        FilterSharedPtr p =
            MemoryManager<FilterThresholdMin>::AllocateSharedPtr(
                pSession, pEquation, pParams);
        return p;
    }

    /// Name of the class
    static std::string className;

    SOLVER_UTILS_EXPORT FilterThresholdMin(
        const LibUtilities::SessionReaderSharedPtr &pSession,
        const std::weak_ptr<EquationSystem> &pEquation,
        const ParamMap &pParams);
    SOLVER_UTILS_EXPORT ~FilterThresholdMin() override;

protected:
    /// Initialises the filter.
    SOLVER_UTILS_EXPORT void v_Initialise(
        const Array<OneD, const MultiRegions::ExpListSharedPtr> &pFields,
        const NekDouble &time) override;
    /// For each point in domain test if solution is below threshold.
    SOLVER_UTILS_EXPORT void v_Update(
        const Array<OneD, const MultiRegions::ExpListSharedPtr> &pFields,
        const NekDouble &time) override;
    /// Finalise the filter and write out data.
    SOLVER_UTILS_EXPORT void v_Finalise(
        const Array<OneD, const MultiRegions::ExpListSharedPtr> &pFields,
        const NekDouble &time) override;
    /// Indicate that this filter is time dependent.
    SOLVER_UTILS_EXPORT bool v_IsTimeDependent() override;

private:
    /// Storage for recording when each point in domain drops below threshold.
    Array<OneD, NekDouble> m_threshold;
    /// Time at which to start recording.
    NekDouble m_startTime;
    /// Value of threshold.
    NekDouble m_thresholdValue;
    /// Variable on which to detect threshold
    int m_thresholdVar;
    /// Initial value of storage.
    NekDouble m_initialValue;
    /// File into which to write output data.
    std::string m_outputFile;
    /// FieldIO object for writing data.
    LibUtilities::FieldIOSharedPtr m_fld;
};

} // namespace Nektar::SolverUtils

#endif /* FILTERTHRESHOLDMAX_H_ */
