/////////////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) 2015-     Statoil ASA
//  Copyright (C) 2015-     Ceetron Solutions AS
//
//  ResInsight is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  ResInsight 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 General Public License at <http://www.gnu.org/licenses/gpl.html>
//  for more details.
//
/////////////////////////////////////////////////////////////////////////////////

#pragma once

#include "cvfBase.h"
#include "cvfVector3.h"

namespace caf
{
template <typename S>
class Tensor3
{
    S m_tensor[6]; // SXX, SYY, SZZ, SXY, SYZ, SZX
public:
    Tensor3();
    Tensor3( S sxx, S syy, S szz, S sxy, S syz, S szx );
    Tensor3( const Tensor3& other );
    template <typename T>
    explicit Tensor3( const Tensor3<T>& other );

    static Tensor3 invalid();

    inline Tensor3& operator=( const Tensor3& rhs );
    inline Tensor3  operator+( const Tensor3& rhs ) const;
    inline Tensor3  operator*( S scale ) const;

    bool equals( const Tensor3& mat ) const;
    bool operator==( const Tensor3& rhs ) const;
    bool operator!=( const Tensor3& rhs ) const;

    enum TensorComponentEnum
    {
        SXX,
        SYY,
        SZZ,
        SXY,
        SYZ,
        SZX
    };
    inline S& operator[]( TensorComponentEnum comp );
    inline S  operator[]( TensorComponentEnum comp ) const;

    void setFromInternalLayout( S* tensorData );
    void setFromAbaqusLayout( S* tensorData );

    cvf::Vec3f calculatePrincipals( cvf::Vec3f principalDirections[3] ) const;
    float      calculateVonMises() const;

    Tensor3 rotated( const cvf::Matrix3<S>& rotMx ) const;
};

typedef Tensor3<float>  Ten3f;
typedef Tensor3<double> Ten3d;

} // namespace caf

#include "cafTensor3.inl"