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#ifndef G4VTKUNSTRUCTUREDGRIDPIPELINE_HH
#define G4VTKUNSTRUCTUREDGRIDPIPELINE_HH

#include <map>
#include <vector>

#include "G4VVtkPipeline.hh"
#include "G4PseudoScene.hh"

#include <vtkSmartPointer.h>
#include <vtkPoints.h>
#include <vtkCharArray.h>
#include <vtkDoubleArray.h>
#include <vtkUnstructuredGrid.h>
#if VTK_MINOR_VERSION >= 2
#include <vtkStaticCleanUnstructuredGrid.h>
#endif
#include <vtkLookupTable.h>
#include <vtkDiscretizableColorTransferFunction.h>

class vtkClipDataSet;
class vtkDataSetMapper;
class vtkUnstructuredGridVolumeMapper;
class vtkUnstructuredGridVolumeRayCastMapper;
class vtkUnstructuredGridVolumeZSweepMapper;
class vtkOpenGLProjectedTetrahedraMapper;
class vtkActor;

class G4Mesh;

class G4VtkUnstructuredGridPipeline : public G4VVtkPipeline
{
  public:
    G4VtkUnstructuredGridPipeline(G4String name, const G4VtkVisContext& vc);

    ~G4VtkUnstructuredGridPipeline() = default;

    void AddFilter(vtkSmartPointer<vtkUnstructuredGridAlgorithm> f) { filters.push_back(f); }
    vtkSmartPointer<vtkUnstructuredGridAlgorithm> GetFilter(G4int iFilter) { return filters[iFilter]; }
    std::size_t GetNumberOfFilters() { return filters.size(); }
    vtkSmartPointer<vtkUnstructuredGridAlgorithm> GetFinalFilter() { return filters[filters.size() - 1]; }

    void Modified() {};
    void Clear() {};
    void Print() {};

    void Enable() {};
    void Disable() {};

    void SetUnstructuredGridData(const G4Mesh &mesh);

  protected:
    class PseudoSceneVtkBase: public G4PseudoScene {
      public:
        PseudoSceneVtkBase(G4PhysicalVolumeModel* pvModel,  // input
                           G4int depth,
                           vtkPoints *points,
                           vtkDoubleArray *pointColourValues,
                           vtkDoubleArray *cellColourValues,
                           vtkDoubleArray *pointColourIndices,
                           vtkDoubleArray *cellColourIndices,
                           vtkDiscretizableColorTransferFunction *colourLUT,
                           vtkUnstructuredGrid *unstructuredGrid)  // input...the following are outputs by reference
          : fpPVModel(pvModel), fDepth(depth), fpPoints(points), fpGrid(unstructuredGrid),
            fpPointColourValues(pointColourValues), fpCellColourValues(cellColourValues),
            fpPointColourIndices(pointColourIndices), fpCellColourIndices(cellColourIndices),
            fpColourLUT(colourLUT)
        {}

        G4int GetNumberOfPoints() {return iPoint;}
        G4int GetNumberOfCells() {return iCell;}
        G4int GetNumberOfAddedCells() {return iCellAdd;}
        void DumpColourMap() {
          for(auto i : fpColourMap) {
            G4cout << i.first << " " << i.second << G4endl;
          }
        }

      protected:
        using G4PseudoScene::AddSolid;  // except for...
        void AddSolid(const G4VSolid& /*solid*/) override {};
        void AddSolid(const G4Box& /*box*/) override{};
        void ProcessVolume(const G4VSolid&) override {
          // Do nothing if uninteresting solids found, e.g., the container if not marked invisible.
        }
        G4PhysicalVolumeModel* fpPVModel;
        G4int fDepth;
        vtkSmartPointer<vtkPoints> fpPoints;
        vtkSmartPointer<vtkUnstructuredGrid> fpGrid;
        vtkSmartPointer<vtkDoubleArray> fpPointColourValues;
        vtkSmartPointer<vtkDoubleArray> fpCellColourValues;
        vtkSmartPointer<vtkDoubleArray> fpPointColourIndices;
        vtkSmartPointer<vtkDoubleArray> fpCellColourIndices;
        std::map<std::size_t,double> fpColourMap;
        vtkSmartPointer<vtkDiscretizableColorTransferFunction> fpColourLUT;
        std::vector<G4ThreeVector> fpPointVector;
        std::map<std::size_t, std::size_t> fpPointMap;
        G4int iPoint = 0;
        G4int iCell = 0;
        G4int iCellAdd = 0;
    };
    class PseudoSceneForTetCells: public PseudoSceneVtkBase {
      public:
        PseudoSceneForTetCells(G4PhysicalVolumeModel* pvModel,  // input
                               G4int depth,
                               vtkPoints *points,
                               vtkDoubleArray *pointColourValues,
                               vtkDoubleArray *cellColourValues,
                               vtkDoubleArray *pointColourIndices,
                               vtkDoubleArray *cellColourIndices,
                               vtkDiscretizableColorTransferFunction *colourLUT,
                               vtkUnstructuredGrid *unstructuredGrid)                     // input...the following are outputs by reference
          : PseudoSceneVtkBase(pvModel,depth,points,pointColourValues,cellColourValues,
                               pointColourIndices, cellColourIndices, colourLUT, unstructuredGrid)
        {}
      private:
        using G4PseudoScene::AddSolid;  // except for...
        void AddSolid(const G4VSolid& solid) override;
        void ProcessVolume(const G4VSolid&) override {}
    };
    class PseudoSceneForCubicalCells: public PseudoSceneVtkBase {
      public:
        PseudoSceneForCubicalCells(G4PhysicalVolumeModel* pvModel,  // input
                                   G4int depth,
                                   vtkPoints *points,
                                   vtkDoubleArray *pointColourValues,
                                   vtkDoubleArray *cellColourValues,
                                   vtkDoubleArray *pointColourIndices,
                                   vtkDoubleArray *cellColourIndices,
                                   vtkDiscretizableColorTransferFunction *colourLUT,
                                   vtkUnstructuredGrid *unstructuredGrid)                     // input...the following are outputs by reference
          : PseudoSceneVtkBase(pvModel,depth,points,pointColourValues,cellColourValues,
                               pointColourIndices,cellColourIndices,colourLUT, unstructuredGrid)
        {}
      private:
        using G4PseudoScene::AddSolid;  // except for...
        void AddSolid(const G4Box& box) override;
        void ProcessVolume(const G4VSolid&) override {}
    };

  private:
    vtkSmartPointer<vtkPoints> points;
    vtkSmartPointer<vtkDoubleArray> pointColourValues;
    vtkSmartPointer<vtkDoubleArray> cellColourValues;
    vtkSmartPointer<vtkDoubleArray> pointColourIndices;
    vtkSmartPointer<vtkDoubleArray> cellColourIndices;
    vtkSmartPointer<vtkDiscretizableColorTransferFunction> colourLUT;

    vtkSmartPointer<vtkUnstructuredGrid> unstructuredGrid;
    std::vector<vtkSmartPointer<vtkUnstructuredGridAlgorithm>> filters;  // derived types can store filters in this vector
#if VTK_MINOR_VERSION >= 2
    vtkSmartPointer<vtkStaticCleanUnstructuredGrid> clean;
#endif
    vtkSmartPointer<vtkClipDataSet> clip;
    vtkSmartPointer<vtkDataSetMapper> mapper;
    vtkSmartPointer<vtkUnstructuredGridVolumeRayCastMapper> volumeMapper;
    vtkSmartPointer<vtkActor> actor;
    vtkSmartPointer<vtkVolume> volume;
};


#endif  // G4VTKUNSTRUCTUREDGRIDPIPELINE_HH