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/* This file is part of the Palabos library.
 *
 * Copyright (C) 2011-2015 FlowKit Sarl
 * Route d'Oron 2
 * 1010 Lausanne, Switzerland
 * E-mail contact: contact@flowkit.com
 *
 * The most recent release of Palabos can be downloaded at 
 * <http://www.palabos.org/>
 *
 * The library Palabos is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * The library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef TRANSIENT_STATISTICS_3D_H
#define TRANSIENT_STATISTICS_3D_H

#include "core/array.h"
#include "core/globalDefs.h"
#include "core/geometry3D.h"
#include "multiBlock/multiBlockLattice3D.h"
#include "multiBlock/multiDataField3D.h"

#include <string>

namespace plb {

/* ***************** Transient Statistics Manager ************************* */

template<typename T, template<typename U> class Descriptor>
class TransientStatistics3D {
public:
    TransientStatistics3D(MultiBlockLattice3D<T,Descriptor>& lattice_, Box3D const& domain_);
    TransientStatistics3D(TransientStatistics3D<T,Descriptor> const& rhs);
    void swap(TransientStatistics3D<T,Descriptor>& rhs);
    TransientStatistics3D<T,Descriptor>& operator=(TransientStatistics3D<T,Descriptor> const& rhs);
    TransientStatistics3D<T,Descriptor>* clone() const;
    ~TransientStatistics3D();
    // Field must be one of:
    // "velocityX", "velocityY", "velocityZ", "velocityNorm", "pressure", "vorticityX", "vorticityY", "vorticityZ", "vorticityNorm"
    // Operation must be one of:
    // "min", "max", "ave" (for mean value), "rms", "dev" (for standard deviation).
    bool registerFieldOperation(std::string field, std::string operation);
    void initialize();
    void update();
    MultiScalarField3D<T>* get(std::string field, std::string operation) const;
    // "rho" is the actual fluid density in physical units.
    // "pressureOffset" is the ambient pressure in physical units.
    // "rhoLB" is the lattice-Boltzmann density (1 by default).
    void output(std::string path, std::string domainName, plint iteration, plint namePadding, T dx, T dt,
            Array<T,3> const& physicalLocation, T rho = T(1), T pressureOffset = T(0), T rhoLB = T(1));
private:
    int fieldToId(std::string field) const;
    int operationToId(std::string operation) const;
    std::string idToField(int iField) const;
    std::string idToOperation(int iOperation) const;
    T getScalingFactor(int iField, T dx, T dt, T rho) const;
    T getOffset(int iField, T dx, T dt, T rho, T pressureOffset, T rhoLB) const;
    MultiScalarField3D<T>* computeField(int iField) const;
    std::string getFileName(std::string path, int iField, int iOperation, std::string domainName,
            plint iteration, plint namePadding) const;
private:
    enum { numFields = 9 };
    enum { velocityX, velocityY, velocityZ, velocityNorm, pressure, vorticityX, vorticityY, vorticityZ, vorticityNorm };
    enum { numOperations = 5 };
    enum { min, max, ave, rms, dev };
private:
    MultiBlockLattice3D<T,Descriptor>& lattice;                 // Reference to the lattice of the simulation.
    Box3D domain;                                               // Domain to compute and output transient statistics.
    Box3D enlargedDomain;                                       // Domain to compute vorticity.
    plint n;                                                    // Number of times the statistics are updated.
    int isInitialized;                                          // Is the data structure initialized or not.
    int fieldIsRegistered[numFields];                           // Array of all registered fields.
    int fieldOperationIsRegistered[numFields][numOperations];   // Table of all registered fields and operations.
    MultiScalarField3D<T>* blocks[numFields][numOperations];    // All scalar fields to operate on.
};

}  // namespace plb

#endif  // TRANSIENT_STATISTICS_3D_H