/////////////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) Statoil ASA
//
//  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 "cafTensor3.h"
#include "cvfVector3.h"
#include "cvfVector4.h"

#include <vector>

class RigGeoMechBoreHoleStressCalculator
{
public:
    RigGeoMechBoreHoleStressCalculator( const caf::Ten3d& tensor,
                                        double            porePressure,
                                        double            poissonRatio,
                                        double            uniaxialCompressiveStrength,
                                        int               nThetaSubSamples );
    double solveFractureGradient( double* thetaOut = nullptr );
    double solveStassiDalia( double* thetaOut = nullptr );

private:
    typedef double ( RigGeoMechBoreHoleStressCalculator::*MemberFunc )( double pw, double* thetaOut ) const;
    double     solveBisection( double minPw, double maxPw, MemberFunc fn, double* thetaOut );
    double     solveSecant( MemberFunc fn, double* thetaOut );
    double     sigmaTMinOfMin( double wellPressure, double* thetaAtMin ) const;
    double     stassiDalia( double wellPressure, double* thetaAtMin ) const;
    void       calculateStressComponents();
    cvf::Vec4d calculateStressComponentsForSegmentAngle( double theta ) const;

    caf::Ten3d              m_tensor;
    double                  m_porePressure;
    double                  m_poissonRatio;
    double                  m_uniaxialCompressiveStrength;
    int                     m_nThetaSubSamples;
    std::vector<cvf::Vec4d> m_stressComponents;
};