/////////////////////////////////////////////////////////////////////////////////
//
//  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.
//
/////////////////////////////////////////////////////////////////////////////////

#include <cstdlib>

#include "RivFemPartPartMgr.h"

#include "RivGeoMechPartMgr.h"

#include "RiaPreferences.h"

#include "RifGeoMechReaderInterface.h"

#include "RigFemPart.h"
#include "RigFemPartResultsCollection.h"
#include "RigFemScalarResultFrames.h"
#include "RigGeoMechCaseData.h"

#include "RimEclipseView.h"
#include "RimGeoMechCellColors.h"
#include "RimGeoMechView.h"
#include "RimRegularLegendConfig.h"

#include "RivFemPickSourceInfo.h"
#include "RivMeshLinesSourceInfo.h"
#include "RivPartPriority.h"
#include "RivResultToTextureMapper.h"
#include "RivScalarMapperUtils.h"
#include "RivSourceInfo.h"
#include "RivTextureCoordsCreator.h"

#include "cafEffectGenerator.h"

#include "cvfDrawableGeo.h"
#include "cvfModelBasicList.h"
#include "cvfPart.h"
#include "cvfRenderStateBlending.h"
#include "cvfRenderStatePolygonOffset.h"
#include "cvfRenderState_FF.h"
#include "cvfShaderProgram.h"
#include "cvfShaderProgramGenerator.h"
#include "cvfShaderSourceProvider.h"
#include "cvfShaderSourceRepository.h"
#include "cvfStructGrid.h"
#include "cvfTransform.h"
#include "cvfUniform.h"

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
RivFemPartPartMgr::RivFemPartPartMgr( const RigFemPart* part, cvf::Vec3d displayOffset )
    : m_surfaceGenerator( part, displayOffset )
    , m_part( part )
    , m_opacityLevel( 1.0f )
    , m_defaultColor( cvf::Color3::WHITE )
{
    CVF_ASSERT( part );
    m_partIdx                   = part->elementPartId();
    m_cellVisibility            = new cvf::UByteArray;
    m_surfaceFacesTextureCoords = new cvf::Vec2fArray;
}

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

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RivFemPartPartMgr::setTransform( cvf::Transform* scaleTransform )
{
    m_scaleTransform = scaleTransform;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RivFemPartPartMgr::setCellVisibility( cvf::UByteArray* cellVisibilities )
{
    CVF_ASSERT( m_scaleTransform.notNull() );
    CVF_ASSERT( cellVisibilities );

    m_cellVisibility = cellVisibilities;

    m_surfaceGenerator.setElementVisibility( cellVisibilities );

    generatePartGeometry( m_surfaceGenerator );
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RivFemPartPartMgr::setDisplacements( bool                           useDisplacements,
                                          double                         scalingFactor,
                                          const std::vector<cvf::Vec3f>& displacements )
{
    size_t nodeCount = m_part->nodes().coordinates.size();
    m_displacedNodeCoordinates.resize( nodeCount );
    const auto coords = m_part->nodes().coordinates;

    if ( useDisplacements )
    {
        for ( size_t i = 0; i < nodeCount; i++ )
        {
            m_displacedNodeCoordinates[i] = coords[i] + displacements[i] * scalingFactor;
        }
    }
    else
    {
        for ( size_t i = 0; i < nodeCount; i++ )
        {
            m_displacedNodeCoordinates[i] = coords[i];
        }
    }
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RivFemPartPartMgr::generatePartGeometry( RivFemPartGeometryGenerator& geoBuilder )
{
    bool useBufferObjects = true;
    // Surface geometry
    {
        m_surfaceFaces = nullptr; // To possibly free memory before adding the new stuff

        cvf::ref<cvf::DrawableGeo> geo = geoBuilder.generateSurface( m_displacedNodeCoordinates );
        if ( geo.notNull() )
        {
            geo->computeNormals();

            if ( useBufferObjects )
            {
                geo->setRenderMode( cvf::DrawableGeo::BUFFER_OBJECT );
            }

            cvf::ref<cvf::Part> part = new cvf::Part;
            part->setName( "FemPart " + cvf::String( m_partIdx ) );
            part->setId( m_partIdx ); // Use part index as part ID
            part->setDrawable( geo.p() );
            part->setTransform( m_scaleTransform.p() );

            // Set mapping from triangle face index to element index
            cvf::ref<RivFemPickSourceInfo> si = new RivFemPickSourceInfo( m_partIdx, geoBuilder.triangleToElementMapper() );
            part->setSourceInfo( si.p() );

            part->updateBoundingBox();

            // Set default effect
            caf::SurfaceEffectGenerator geometryEffgen( cvf::Color4f( cvf::Color3f::WHITE ), caf::PO_1 );
            cvf::ref<cvf::Effect>       geometryOnlyEffect = geometryEffgen.generateCachedEffect();
            part->setEffect( geometryOnlyEffect.p() );
            part->setEnableMask( surfaceBit );
            m_surfaceFaces = part;
        }
    }

    // Mesh geometry
    {
        m_surfaceGridLines = nullptr; // To possibly free memory before adding the new stuff

        cvf::ref<cvf::DrawableGeo> geoMesh = geoBuilder.createMeshDrawable();
        if ( geoMesh.notNull() )
        {
            if ( useBufferObjects )
            {
                geoMesh->setRenderMode( cvf::DrawableGeo::BUFFER_OBJECT );
            }

            cvf::ref<cvf::Part> part = new cvf::Part;
            part->setName( "Grid mesh " + cvf::String( m_partIdx ) );
            part->setDrawable( geoMesh.p() );

            part->setTransform( m_scaleTransform.p() );
            part->updateBoundingBox();

            RiaPreferences* prefs = RiaPreferences::current();

            cvf::ref<cvf::Effect>    eff;
            caf::MeshEffectGenerator effGen( prefs->defaultGridLineColors() );
            eff = effGen.generateCachedEffect();

            part->setPriority( RivPartPriority::PartType::MeshLines );

            part->setEnableMask( meshSurfaceBit );
            part->setEffect( eff.p() );

            part->setSourceInfo( new RivMeshLinesSourceInfo( nullptr ) );

            m_surfaceGridLines = part;
        }
    }
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RivFemPartPartMgr::appendPartsToModel( cvf::ModelBasicList* model )
{
    CVF_ASSERT( model != nullptr );

    if ( m_part->enabled() )
    {
        if ( m_surfaceFaces.notNull() ) model->addPart( m_surfaceFaces.p() );
        if ( m_surfaceGridLines.notNull() ) model->addPart( m_surfaceGridLines.p() );
    }
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
const RivFemPartGeometryGenerator* RivFemPartPartMgr::surfaceGenerator() const
{
    return &m_surfaceGenerator;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RivFemPartPartMgr::updateCellColor( cvf::Color4f color )
{
    if ( m_surfaceFaces.isNull() ) return;
    if ( !m_part->enabled() ) return;

    // Set default effect
    caf::SurfaceEffectGenerator geometryEffgen( color, caf::PO_1 );
    cvf::ref<cvf::Effect>       geometryOnlyEffect = geometryEffgen.generateCachedEffect();

    if ( m_surfaceFaces.notNull() ) m_surfaceFaces->setEffect( geometryOnlyEffect.p() );

    if ( color.a() < 1.0f )
    {
        // Set priority to make sure this transparent geometry are rendered last
        if ( m_surfaceFaces.notNull() ) m_surfaceFaces->setPriority( RivPartPriority::PartType::Transparent );
    }

    m_opacityLevel = color.a();
    m_defaultColor = color.toColor3f();

    // Update mesh colors as well, in case of change
    RiaPreferences* prefs = RiaPreferences::current();

    cvf::ref<cvf::Effect> eff;
    if ( m_surfaceFaces.notNull() )
    {
        caf::MeshEffectGenerator effGen( prefs->defaultGridLineColors() );
        eff = effGen.generateCachedEffect();
        m_surfaceGridLines->setEffect( eff.p() );
    }
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RivFemPartPartMgr::updateCellResultColor( size_t timeStepIndex, RimGeoMechCellColors* cellResultColors )
{
    CVF_ASSERT( cellResultColors );

    if ( !m_part->enabled() ) return;

    cvf::ref<cvf::Color3ubArray> surfaceFacesColorArray;

    // Outer surface
    if ( m_surfaceFaces.notNull() )
    {
        const cvf::ScalarMapper* mapper = cellResultColors->legendConfig()->scalarMapper();

        RigGeoMechCaseData* caseData = cellResultColors->ownerCaseData();

        if ( !caseData ) return;

        RigFemResultAddress resVarAddress = cellResultColors->resultAddress();

        // Do a "Hack" to show elm nodal and not nodal POR results
        if ( resVarAddress.resultPosType == RIG_NODAL && resVarAddress.fieldName == "POR-Bar" )
        {
            resVarAddress.resultPosType = RIG_ELEMENT_NODAL;
        }

        const std::vector<float>& resultValues =
            caseData->femPartResults()->resultValues( resVarAddress, m_partIdx, (int)timeStepIndex );

        const std::vector<size_t>* vxToResultMapping = nullptr;
        int                        vxCount           = 0;

        if ( resVarAddress.resultPosType == RIG_NODAL )
        {
            vxToResultMapping = &( m_surfaceGenerator.quadVerticesToNodeIdxMapping() );
        }
        else if ( resVarAddress.resultPosType == RIG_ELEMENT_NODAL || resVarAddress.resultPosType == RIG_INTEGRATION_POINT ||
                  resVarAddress.resultPosType == RIG_FORMATION_NAMES )
        {
            vxToResultMapping = &( m_surfaceGenerator.quadVerticesToGlobalElmNodeIdx() );
        }
        else if ( resVarAddress.resultPosType == RIG_ELEMENT_NODAL_FACE )
        {
            vxToResultMapping = &( m_surfaceGenerator.quadVerticesToGlobalElmFaceNodeIdx() );
        }
        else if ( resVarAddress.resultPosType == RIG_ELEMENT )
        {
            vxToResultMapping = &( m_surfaceGenerator.quadVerticesToGlobalElmIdx() );
        }

        if ( !vxToResultMapping ) return;

        vxCount = static_cast<int>( vxToResultMapping->size() );
        m_surfaceFacesTextureCoords->resize( vxCount );

        if ( resultValues.size() == 0 )
        {
            m_surfaceFacesTextureCoords->setAll( cvf::Vec2f( 0.0, 1.0f ) );
        }
        else
        {
            cvf::Vec2f* rawPtr = m_surfaceFacesTextureCoords->ptr();

#pragma omp parallel for schedule( dynamic )
            for ( int quadStartIdx = 0; quadStartIdx < vxCount; quadStartIdx += 4 )
            {
                float resultValue1 = resultValues[( *vxToResultMapping )[quadStartIdx + 0]];
                float resultValue2 = resultValues[( *vxToResultMapping )[quadStartIdx + 1]];
                float resultValue3 = resultValues[( *vxToResultMapping )[quadStartIdx + 2]];
                float resultValue4 = resultValues[( *vxToResultMapping )[quadStartIdx + 3]];

                if ( resultValue1 == HUGE_VAL || resultValue1 != resultValue1 // a != a is true for NAN's
                     || resultValue2 == HUGE_VAL || resultValue2 != resultValue2 || resultValue3 == HUGE_VAL ||
                     resultValue3 != resultValue3 || resultValue4 == HUGE_VAL || resultValue4 != resultValue4 )
                {
                    rawPtr[quadStartIdx][1]     = 1.0f;
                    rawPtr[quadStartIdx + 1][1] = 1.0f;
                    rawPtr[quadStartIdx + 2][1] = 1.0f;
                    rawPtr[quadStartIdx + 3][1] = 1.0f;
                }
                else
                {
                    rawPtr[quadStartIdx]     = mapper->mapToTextureCoord( resultValue1 );
                    rawPtr[quadStartIdx + 1] = mapper->mapToTextureCoord( resultValue2 );
                    rawPtr[quadStartIdx + 2] = mapper->mapToTextureCoord( resultValue3 );
                    rawPtr[quadStartIdx + 3] = mapper->mapToTextureCoord( resultValue4 );
                }
            }
        }

        Rim3dView* view = nullptr;
        cellResultColors->firstAncestorOrThisOfType( view );
        CVF_ASSERT( view );

        RivScalarMapperUtils::applyTextureResultsToPart( m_surfaceFaces.p(),
                                                         m_surfaceFacesTextureCoords.p(),
                                                         mapper,
                                                         m_opacityLevel,
                                                         caf::FC_NONE,
                                                         view->isLightingDisabled() );
    }
}