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

#pragma once

#include "RimCheckableNamedObject.h"

#include "RigContourMapCalculator.h"
#include "RigContourPolygonsTools.h"

#include "cafPdmField.h"
#include "cafPdmObject.h"

#include "cvfArray.h"
#include "cvfBoundingBox.h"
#include "cvfVector2.h"

class RigContourMapGrid;
class RimGridView;
class RimRegularLegendConfig;

//==================================================================================================
///
///
//==================================================================================================
class RimContourMapProjection : public RimCheckableNamedObject
{
    CAF_PDM_HEADER_INIT;

public:
    using CellIndexAndResult = std::pair<size_t, double>;

    using ResultAggregation = caf::AppEnum<RigContourMapCalculator::ResultAggregationEnum>;
    using ContourPolygons   = std::vector<RigContourPolygonsTools::ContourPolygon>;

    RimContourMapProjection();
    ~RimContourMapProjection() override;

    void generateResultsIfNecessary( int timeStep );
    void generateGeometryIfNecessary();
    void clearGeometry();

    std::vector<cvf::Vec3d> generatePickPointPolygon();

    const std::vector<ContourPolygons>& contourPolygons() const;
    const std::vector<cvf::Vec4d>&      trianglesWithVertexValues();

    virtual double sampleSpacing() const = 0;

    double sampleSpacingFactor() const;
    void   setSampleSpacingFactor( double spacingFactor );
    bool   showContourLines() const;
    bool   showContourLabels() const;

    QString resultAggregationText() const;

    QString caseName() const;
    QString currentTimeStepName() const;

    double maxValue() const;
    double minValue() const;

    double meanValue() const;
    double sumAllValues() const;

    cvf::Vec2ui numberOfElementsIJ() const;
    cvf::Vec2ui numberOfVerticesIJ() const;

    bool isColumnResult() const;
    bool isMeanResult() const;
    bool isStraightSummationResult() const;

    double valueAtVertex( uint i, uint j ) const;

    uint   numberOfCells() const;
    uint   numberOfValidCells() const;
    size_t numberOfVertices() const;

    bool       checkForMapIntersection( const cvf::Vec3d& domainPoint3d, cvf::Vec2d* contourMapPoint, double* valueAtPoint ) const;
    void       setPickPoint( cvf::Vec2d globalPickPoint );
    cvf::Vec3d origin3d() const;

    std::vector<double> xVertexPositions() const;
    std::vector<double> yVertexPositions() const;

    // Pure-virtual public methods which should be overridden by Eclipse and Geo-mechanical contour map implementations
    virtual QString                 resultDescriptionText() const = 0;
    virtual RimRegularLegendConfig* legendConfig() const          = 0;
    virtual void                    updateLegend()                = 0;

    // Use this function to get the result index into grid cell results. The index will differ if we have active cells
    virtual size_t gridResultIndex( size_t globalCellIdx ) const;

    virtual std::vector<double> retrieveParameterWeights() = 0;

    virtual size_t              kLayer( size_t globalCellIdx ) const                                               = 0;
    virtual size_t              kLayers() const                                                                    = 0;
    virtual std::vector<size_t> findIntersectingCells( const cvf::BoundingBox& bbox ) const                        = 0;
    virtual double              calculateOverlapVolume( size_t globalCellIdx, const cvf::BoundingBox& bbox ) const = 0;
    virtual double calculateRayLengthInCell( size_t globalCellIdx, const cvf::Vec3d& highestPoint, const cvf::Vec3d& lowestPoint ) const = 0;
    virtual double getParameterWeightForCell( size_t globalCellIdx, const std::vector<double>& parameterWeights ) const = 0;

    virtual cvf::ref<cvf::UByteArray> getCellVisibility() const;

protected:
    // Protected virtual methods to be overridden by Eclipse and Geo-mechanical contour map implementations
    virtual void                updateGridInformation()         = 0;
    virtual std::vector<double> generateResults( int timeStep ) = 0;
    virtual bool                resultVariableChanged() const   = 0;
    virtual void                clearResultVariable()           = 0;
    virtual RimGridView*        baseView() const                = 0;

    double calculateValueInMapCell( uint i, uint j, const std::vector<double>& gridCellValues ) const;

protected:
    // Keep track of whether cached data needs updating
    bool gridMappingNeedsUpdating() const;
    bool resultsNeedsUpdating( int timeStep ) const;
    bool geometryNeedsUpdating() const;
    bool resultRangeIsValid() const;
    void clearGridMapping();
    void clearResults();
    void clearTimeStepRange();

    double maxValue( const std::vector<double>& aggregatedResults ) const;
    double minValue( const std::vector<double>& aggregatedResults ) const;

    virtual std::pair<double, double> minmaxValuesAllTimeSteps();

    virtual std::vector<bool>                                  getMapCellVisibility();
    bool                                                       mapCellVisibilityNeedsUpdating();
    static std::vector<std::vector<std::pair<size_t, double>>> generateGridMapping( RimContourMapProjection& contourMapProjection,
                                                                                    const RigContourMapGrid& contourMapGrid );

    void generateVertexResults();
    void generateTrianglesWithVertexValues();
    void generateContourPolygons();

    static double sumTriangleAreas( const std::vector<cvf::Vec4d>& triangles );

    double interpolateValue( const cvf::Vec2d& gridPosition2d ) const;
    double valueInCell( uint i, uint j ) const;
    bool   hasResultInCell( uint i, uint j ) const;
    double calculateValueAtVertex( uint i, uint j ) const;

    // Cell index and position conversion
    std::vector<CellIndexAndResult> cellsAtIJ( uint i, uint j ) const;

    double       gridEdgeOffset() const;
    virtual void updateAfterResultGeneration( int timeStep ) = 0;

protected:
    // Framework overrides
    void fieldChangedByUi( const caf::PdmFieldHandle* changedField, const QVariant& oldValue, const QVariant& newValue ) override;
    void defineEditorAttribute( const caf::PdmFieldHandle* field, QString uiConfigName, caf::PdmUiEditorAttribute* attribute ) override;
    void defineUiOrdering( QString uiConfigName, caf::PdmUiOrdering& uiOrdering ) override;
    void defineUiTreeOrdering( caf::PdmUiTreeOrdering& uiTreeOrdering, QString uiConfigName = "" ) override;
    void initAfterRead() override;

protected:
    caf::PdmField<double> m_relativeSampleSpacing;

    caf::PdmField<ResultAggregation> m_resultAggregation;
    caf::PdmField<bool>              m_showContourLines;
    caf::PdmField<bool>              m_showContourLabels;
    caf::PdmField<bool>              m_smoothContourLines;

    cvf::ref<cvf::UByteArray>                           m_cellGridIdxVisibility;
    std::vector<double>                                 m_aggregatedResults;
    std::vector<double>                                 m_aggregatedVertexResults;
    std::vector<std::vector<std::pair<size_t, double>>> m_projected3dGridIndices;

    cvf::Vec2d                   m_pickPoint;
    std::vector<ContourPolygons> m_contourPolygons;
    std::vector<double>          m_contourLevelCumulativeAreas;
    std::vector<cvf::Vec4d>      m_trianglesWithVertexValues;
    int                          m_currentResultTimestep;
    std::vector<bool>            m_mapCellVisibility;

    double m_minResultAllTimeSteps;
    double m_maxResultAllTimeSteps;

    std::unique_ptr<RigContourMapGrid> m_contourMapGrid;
};