/////////////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) 2020-     Equinor 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.
//
/////////////////////////////////////////////////////////////////////////////////

#include "RigFemPartResultCalculatorNormalized.h"

#include "RigFemPart.h"
#include "RigFemPartCollection.h"
#include "RigFemPartGrid.h"
#include "RigFemPartResultsCollection.h"
#include "RigFemResultAddress.h"
#include "RigFemScalarResultFrames.h"

#include "RiaWellLogUnitTools.h"

#include "cafProgressInfo.h"

#include <QString>

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
RigFemPartResultCalculatorNormalized::RigFemPartResultCalculatorNormalized( RigFemPartResultsCollection& collection )
    : RigFemPartResultCalculator( collection )
{
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
RigFemPartResultCalculatorNormalized::~RigFemPartResultCalculatorNormalized()
{
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
bool RigFemPartResultCalculatorNormalized::isMatching( const RigFemResultAddress& resVarAddr ) const
{
    return ( resVarAddr.normalizeByHydrostaticPressure() && RigFemPartResultsCollection::isNormalizableResult( resVarAddr ) );
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
RigFemScalarResultFrames* RigFemPartResultCalculatorNormalized::calculate( int partIndex, const RigFemResultAddress& resVarAddr )
{
    CVF_ASSERT( resVarAddr.normalizeByHydrostaticPressure() && isNormalizableResult( resVarAddr ) );

    RigFemResultAddress unscaledResult = resVarAddr;
    if ( unscaledResult.resultPosType == RIG_NODAL && unscaledResult.fieldName == "POR-Bar" )
        unscaledResult.resultPosType = RIG_ELEMENT_NODAL;
    unscaledResult.normalizedByHydrostaticPressure = false;

    CAF_ASSERT( unscaledResult.resultPosType == RIG_ELEMENT_NODAL );

    caf::ProgressInfo stepCountProgress( m_resultCollection->timeStepCount() * 4, "Calculating Normalized Result" );

    RigFemScalarResultFrames* porDataFrames = nullptr;
    RigFemScalarResultFrames* srcDataFrames = nullptr;
    RigFemScalarResultFrames* dstDataFrames = nullptr;

    {
        auto task     = stepCountProgress.task( "Loading POR Result", m_resultCollection->timeStepCount() );
        porDataFrames = m_resultCollection->findOrLoadScalarResult( partIndex, RigFemResultAddress( RIG_ELEMENT_NODAL, "POR-Bar", "" ) );
        if ( !porDataFrames ) return nullptr;
    }

    {
        auto task     = stepCountProgress.task( "Loading Unscaled Result", m_resultCollection->timeStepCount() );
        srcDataFrames = m_resultCollection->findOrLoadScalarResult( partIndex, unscaledResult );
        if ( !srcDataFrames ) return nullptr;
    }
    {
        auto task     = stepCountProgress.task( "Creating Space for Normalized Result", m_resultCollection->timeStepCount() );
        dstDataFrames = m_resultCollection->createScalarResult( partIndex, RigFemResultAddress( resVarAddr ) );
        if ( !dstDataFrames ) return nullptr;
    }

    stepCountProgress.setProgressDescription( "Normalizing Result" );
    stepCountProgress.setNextProgressIncrement( 1u );

    const RigFemPart*     femPart     = m_resultCollection->parts()->part( partIndex );
    const RigFemPartGrid* femPartGrid = femPart->getOrCreateStructGrid();

    constexpr float                inf          = std::numeric_limits<float>::infinity();
    int                            elmNodeCount = femPart->elementCount();
    const std::vector<cvf::Vec3f>& nodeCoords   = femPart->nodes().coordinates;

    const int timeSteps = srcDataFrames->timeStepCount();
    for ( int stepIdx = 0; stepIdx < timeSteps; stepIdx++ )
    {
        const int frameCount = srcDataFrames->frameCount( stepIdx );
        for ( int fIdx = 0; fIdx < frameCount; fIdx++ )
        {
            const std::vector<float>& porFrameData = porDataFrames->frameData( stepIdx, fIdx );
            if ( porFrameData.empty() ) continue;
            const std::vector<float>& srcFrameData = srcDataFrames->frameData( stepIdx, fIdx );
            std::vector<float>&       dstFrameData = dstDataFrames->frameData( stepIdx, fIdx );

            size_t resultCount = srcFrameData.size();
            dstFrameData.resize( resultCount );

            if ( unscaledResult.resultPosType == RIG_ELEMENT_NODAL )
            {
#pragma omp parallel for schedule( dynamic )
                for ( int elmIdx = 0; elmIdx < femPart->elementCount(); ++elmIdx )
                {
                    RigElementType elmType = femPart->elementType( elmIdx );
                    if ( !( elmType == HEX8 || elmType == HEX8P ) ) continue;

                    bool porRegion = false;
                    for ( int elmLocalNodeIdx = 0; elmLocalNodeIdx < 8; ++elmLocalNodeIdx )
                    {
                        size_t    elmNodeResIdx     = femPart->elementNodeResultIdx( elmIdx, elmLocalNodeIdx );
                        const int nodeIdx           = femPart->nodeIdxFromElementNodeResultIdx( elmNodeResIdx );
                        dstFrameData[elmNodeResIdx] = srcFrameData[elmNodeResIdx];
                        if ( porFrameData[elmNodeResIdx] != std::numeric_limits<float>::infinity() )
                        {
                            porRegion = true;
                        }
                    }
                    if ( porRegion )
                    {
                        // This is in the POR-region. Use hydrostatic pressure from the individual nodes
                        for ( int elmLocalNodeIdx = 0; elmLocalNodeIdx < 8; ++elmLocalNodeIdx )
                        {
                            size_t    elmNodeResIdx       = femPart->elementNodeResultIdx( elmIdx, elmLocalNodeIdx );
                            const int nodeIdx             = femPart->nodeIdxFromElementNodeResultIdx( elmNodeResIdx );
                            double    tvdRKB              = std::abs( nodeCoords[nodeIdx].z() ) + m_resultCollection->normalizationAirGap();
                            double    hydrostaticPressure = RiaWellLogUnitTools<double>::hydrostaticPorePressureBar( tvdRKB );
                            dstFrameData[elmNodeResIdx] /= hydrostaticPressure;
                        }
                    }
                    else
                    {
                        // Over/under/sideburden. Use hydrostatic pressure from cell centroid.
                        cvf::Vec3d cellCentroid       = femPartGrid->cellCentroid( elmIdx );
                        double     cellCentroidTvdRKB = std::abs( cellCentroid.z() ) + m_resultCollection->normalizationAirGap();
                        double cellCenterHydroStaticPressure = RiaWellLogUnitTools<double>::hydrostaticPorePressureBar( cellCentroidTvdRKB );

                        for ( int elmLocalNodeIdx = 0; elmLocalNodeIdx < 8; ++elmLocalNodeIdx )
                        {
                            size_t elmNodeResIdx = femPart->elementNodeResultIdx( elmIdx, elmLocalNodeIdx );
                            dstFrameData[elmNodeResIdx] /= cellCenterHydroStaticPressure;
                        }
                    }
                }
            }
        }
    }
    return dstDataFrames;
}
