/////////////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) 2018-     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 "RicCreateWellTargetsPickEventHandler.h"

#include "RiaGuiApplication.h"
#include "RiaOffshoreSphericalCoords.h"

#include "RigFemPart.h"
#include "RigFemPartCollection.h"
#include "RigFemPartGrid.h"
#include "RigHexIntersectionTools.h"
#include "RigMainGrid.h"
#include "RigWellPath.h"

#include "Rim3dView.h"
#include "RimEclipseView.h"
#include "RimGeoMechView.h"
#include "RimModeledWellPath.h"
#include "RimWellPath.h"
#include "RimWellPathGeometryDef.h"
#include "RimWellPathTarget.h"

#include "RiuViewerCommands.h"

#include "RivFemPartGeometryGenerator.h"
#include "RivFemPickSourceInfo.h"
#include "RivSourceInfo.h"
#include "RivWellPathSourceInfo.h"

#include "cafDisplayCoordTransform.h"
#include "cafSelectionManager.h"

#include "cvfStructGridGeometryGenerator.h"

#include <QDebug>

#include <vector>

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
RicCreateWellTargetsPickEventHandler::RicCreateWellTargetsPickEventHandler( RimWellPathGeometryDef* wellGeometryDef )
    : m_geometryToAddTargetsTo( wellGeometryDef )
{
}

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

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RicCreateWellTargetsPickEventHandler::registerAsPickEventHandler()
{
    RiaGuiApplication::instance()->setOverrideCursor( Qt::CrossCursor );
    Ric3dViewPickEventHandler::registerAsPickEventHandler();
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RicCreateWellTargetsPickEventHandler::notifyUnregistered()
{
    RiaGuiApplication::instance()->restoreOverrideCursor();
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
bool RicCreateWellTargetsPickEventHandler::handle3dPickEvent( const Ric3dPickEvent& eventObject )
{
    if ( m_geometryToAddTargetsTo )
    {
        Rim3dView* rimView             = eventObject.m_view;
        cvf::Vec3d targetPointInDomain = cvf::Vec3d::ZERO;

        // If clicked on an other well path, snap target point to well path center line
        auto firstPickItem      = eventObject.m_pickItemInfos.front();
        auto wellPathSourceInfo = dynamic_cast<const RivWellPathSourceInfo*>( firstPickItem.sourceInfo() );

        auto intersectionPointInDomain = rimView->displayCoordTransform()->transformToDomainCoord(
            firstPickItem.globalPickedPoint() );
        bool   doSetAzimuthAndInclination = false;
        double azimuth                    = 0.0;
        double inclination                = 0.0;

        if ( wellPathSourceInfo )
        {
            targetPointInDomain = wellPathSourceInfo->closestPointOnCenterLine( firstPickItem.faceIdx(),
                                                                                intersectionPointInDomain );

            double md = wellPathSourceInfo->measuredDepth( firstPickItem.faceIdx(), intersectionPointInDomain );
            doSetAzimuthAndInclination =
                calculateAzimuthAndInclinationAtMd( md,
                                                    wellPathSourceInfo->wellPath()->wellPathGeometry(),
                                                    &azimuth,
                                                    &inclination );
        }
        else if ( isGridSourceObject( firstPickItem.sourceInfo() ) )
        {
            targetPointInDomain        = intersectionPointInDomain;
            doSetAzimuthAndInclination = false;

            cvf::Vec3d domainRayOrigin = rimView->displayCoordTransform()->transformToDomainCoord(
                firstPickItem.globalRayOrigin() );
            cvf::Vec3d domainRayEnd = targetPointInDomain + ( targetPointInDomain - domainRayOrigin );

            cvf::Vec3d hexElementIntersection = findHexElementIntersection( rimView,
                                                                            firstPickItem,
                                                                            domainRayOrigin,
                                                                            domainRayEnd );
            CVF_TIGHT_ASSERT( !hexElementIntersection.isUndefined() );
            if ( !hexElementIntersection.isUndefined() )
            {
                targetPointInDomain = hexElementIntersection;
            }
        }
        else
        {
            targetPointInDomain        = intersectionPointInDomain;
            doSetAzimuthAndInclination = false;
        }

        if ( !m_geometryToAddTargetsTo->firstActiveTarget() )
        {
            m_geometryToAddTargetsTo->setReferencePointXyz( targetPointInDomain );

            if ( wellPathSourceInfo )
            {
                double mdrkbAtFirstTarget = wellPathSourceInfo->measuredDepth( firstPickItem.faceIdx(),
                                                                               intersectionPointInDomain );

                RimModeledWellPath* modeledWellPath = dynamic_cast<RimModeledWellPath*>( wellPathSourceInfo->wellPath() );
                if ( modeledWellPath )
                {
                    mdrkbAtFirstTarget += modeledWellPath->geometryDefinition()->mdrkbAtFirstTarget();
                }

                m_geometryToAddTargetsTo->setMdrkbAtFirstTarget( mdrkbAtFirstTarget );
            }
        }

        cvf::Vec3d referencePoint     = m_geometryToAddTargetsTo->referencePointXyz();
        cvf::Vec3d relativeTagetPoint = targetPointInDomain - referencePoint;

        RimWellPathTarget* newTarget = new RimWellPathTarget;

        if ( doSetAzimuthAndInclination )
        {
            newTarget->setAsPointXYZAndTangentTarget( cvf::Vec3d( relativeTagetPoint.x(),
                                                                  relativeTagetPoint.y(),
                                                                  relativeTagetPoint.z() ),
                                                      azimuth,
                                                      inclination );
        }
        else
        {
            newTarget->setAsPointTargetXYD(
                cvf::Vec3d( relativeTagetPoint.x(), relativeTagetPoint.y(), -relativeTagetPoint.z() ) );
        }

        m_geometryToAddTargetsTo->insertTarget( nullptr, newTarget );

        m_geometryToAddTargetsTo->updateConnectedEditors();
        m_geometryToAddTargetsTo->updateWellPathVisualization();

        return true; // Todo: See if we really should eat the event instead
    }

    return false;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
bool RicCreateWellTargetsPickEventHandler::calculateAzimuthAndInclinationAtMd( double             measuredDepth,
                                                                               const RigWellPath* wellPathGeometry,
                                                                               double*            azimuth,
                                                                               double*            inclination ) const
{
    int  mdIndex = -1;
    auto mdList  = wellPathGeometry->measureDepths();

    for ( int i = 0; i < (int)mdList.size(); i++ )
    {
        if ( mdList[i] > measuredDepth )
        {
            mdIndex = i - 1;
            break;
        }
    }

    auto ptList = wellPathGeometry->wellPathPoints();
    if ( mdIndex > 0 && mdIndex < (int)ptList.size() - 2 )
    {
        auto v1 = cvf::Vec3d( ptList[mdIndex - 1] );
        auto v2 = cvf::Vec3d( ptList[mdIndex] );
        auto v3 = cvf::Vec3d( ptList[mdIndex + 1] );
        auto v4 = cvf::Vec3d( ptList[mdIndex + 2] );

        auto v21 = v2 - v1;
        auto v32 = v3 - v2;
        auto v43 = v4 - v3;

        v21.normalize();
        v32.normalize();
        v43.normalize();

        auto v13mean = ( v21 + v32 ) / 2;
        auto v24mean = ( v32 + v43 ) / 2;

        double weight = ( measuredDepth - mdList[mdIndex] ) / ( mdList[mdIndex + 1] - mdList[mdIndex] );
        auto   vTan   = v13mean * weight + v24mean * ( 1 - weight );

        RiaOffshoreSphericalCoords coords( vTan );
        *azimuth     = coords.azi();
        *inclination = coords.inc();
        return true;
    }

    *azimuth     = 0.0;
    *inclination = 0.0;
    return false;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
bool RicCreateWellTargetsPickEventHandler::isGridSourceObject( const cvf::Object* object )
{
    auto sourceInfo    = dynamic_cast<const RivSourceInfo*>( object );
    auto femSourceInfo = dynamic_cast<const RivFemPickSourceInfo*>( object );
    return sourceInfo || femSourceInfo;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
cvf::Vec3d RicCreateWellTargetsPickEventHandler::findHexElementIntersection( Rim3dView*             view,
                                                                             const RiuPickItemInfo& pickItem,
                                                                             const cvf::Vec3d&      domainRayOrigin,
                                                                             const cvf::Vec3d&      domainRayEnd )
{
    auto sourceInfo    = dynamic_cast<const RivSourceInfo*>( pickItem.sourceInfo() );
    auto femSourceInfo = dynamic_cast<const RivFemPickSourceInfo*>( pickItem.sourceInfo() );

    size_t                    cellIndex = cvf::UNDEFINED_SIZE_T;
    std::array<cvf::Vec3d, 8> cornerVertices;
    if ( sourceInfo )
    {
        size_t gridIndex = sourceInfo->gridIndex();
        if ( sourceInfo->hasCellFaceMapping() )
        {
            cellIndex = sourceInfo->m_cellFaceFromTriangleMapper->cellIndex( pickItem.faceIdx() );

            RimEclipseView* eclipseView = dynamic_cast<RimEclipseView*>( view );
            if ( eclipseView && eclipseView->mainGrid() )
            {
                RigGridBase* hitGrid = eclipseView->mainGrid()->gridByIndex( gridIndex );
                hitGrid->cellCornerVertices( cellIndex, cornerVertices.data() );
            }
        }
    }
    else if ( femSourceInfo )
    {
        size_t femPartIndex = femSourceInfo->femPartIndex();
        if ( femSourceInfo->triangleToElmMapper() )
        {
            size_t elementIndex = femSourceInfo->triangleToElmMapper()->elementIndex( pickItem.faceIdx() );

            RimGeoMechView* geoMechView = dynamic_cast<RimGeoMechView*>( view );
            if ( geoMechView && geoMechView->femParts() )
            {
                RigFemPart*    femPart = geoMechView->femParts()->part( femPartIndex );
                RigElementType elType  = femPart->elementType( elementIndex );

                if ( elType == HEX8 || elType == HEX8P )
                {
                    cellIndex                     = elementIndex;
                    const RigFemPartGrid* femGrid = femPart->getOrCreateStructGrid();
                    femGrid->cellCornerVertices( cellIndex, cornerVertices.data() );
                }
            }
        }
    }

    if ( cellIndex )
    {
        std::vector<HexIntersectionInfo> intersectionInfo;
        RigHexIntersectionTools::lineHexCellIntersection( domainRayOrigin,
                                                          domainRayEnd,
                                                          cornerVertices.data(),
                                                          cellIndex,
                                                          &intersectionInfo );
        if ( !intersectionInfo.empty() )
        {
            // Sort intersection on distance to ray origin
            CVF_ASSERT( intersectionInfo.size() > 1 );
            std::sort( intersectionInfo.begin(),
                       intersectionInfo.end(),
                       [&domainRayOrigin]( const HexIntersectionInfo& lhs, const HexIntersectionInfo& rhs ) {
                           return ( lhs.m_intersectionPoint - domainRayOrigin ).lengthSquared() <
                                  ( rhs.m_intersectionPoint - domainRayOrigin ).lengthSquared();
                       } );
            const double eps             = 1.0e-2;
            cvf::Vec3d   intersectionRay = intersectionInfo.back().m_intersectionPoint -
                                         intersectionInfo.front().m_intersectionPoint;
            cvf::Vec3d newPoint = intersectionInfo.front().m_intersectionPoint + intersectionRay * eps;
            CVF_ASSERT( RigHexIntersectionTools::isPointInCell( newPoint, cornerVertices.data() ) );
            return newPoint;
        }
    }
    return cvf::Vec3d::UNDEFINED;
}