///////////////////////////////////////////////////////////////////////////////
//
// File UnsteadyAdvection.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).
//
// 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: Unsteady advection solve routines
//
///////////////////////////////////////////////////////////////////////////////

#ifndef NEKTAR_SOLVERS_ADRSOLVER_EQUATIONSYSTEMS_UNSTEADYADVECTION_H
#define NEKTAR_SOLVERS_ADRSOLVER_EQUATIONSYSTEMS_UNSTEADYADVECTION_H

#include <SolverUtils/UnsteadySystem.h>
#include <SolverUtils/RiemannSolvers/RiemannSolver.h>
#include <SolverUtils/Advection.h>

using namespace Nektar::SolverUtils;

namespace Nektar
{
    class UnsteadyAdvection : public UnsteadySystem
    {
    public:
        friend class MemoryManager<UnsteadyAdvection>;

        /// Creates an instance of this class
        static EquationSystemSharedPtr create(
                const LibUtilities::SessionReaderSharedPtr& pSession) {
            EquationSystemSharedPtr p = MemoryManager<UnsteadyAdvection>::AllocateSharedPtr(pSession);
            p->InitObject();
            return p;
        }
        /// Name of class
        static std::string className;
        
        /// Destructor
        virtual ~UnsteadyAdvection();

    protected:
        SolverUtils::RiemannSolverSharedPtr     m_riemannSolver;
        SolverUtils::AdvectionSharedPtr         m_advection;

        /// Advection velocity
        Array<OneD, Array<OneD, NekDouble> >    m_velocity;
        Array<OneD, NekDouble>                  m_traceVn;

        /// Session reader
        UnsteadyAdvection(const LibUtilities::SessionReaderSharedPtr& pSession);

        /// Evaluate the flux at each solution point
        void GetFluxVector(
            const int i, 
            const Array<OneD, Array<OneD, NekDouble> > &physfield, 
                  Array<OneD, Array<OneD, NekDouble> > &flux);
        
        /// Compute the RHS
        void DoOdeRhs(
            const Array<OneD,  const  Array<OneD, NekDouble> > &inarray,
                  Array<OneD,         Array<OneD, NekDouble> > &outarray,
            const NekDouble time);

        /// Compute the projection
        void DoOdeProjection(
            const Array<OneD,  const  Array<OneD, NekDouble> > &inarray,
                  Array<OneD,         Array<OneD, NekDouble> > &outarray,
            const NekDouble time);

        /// Get the normal velocity
        Array<OneD, NekDouble> &GetNormalVelocity();
        
        /// Initialise the object
        virtual void v_InitObject();
        
        /// Print Summary
        virtual void v_PrintSummary(std::ostream &out);
    };
}

#endif
