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#ifndef G4VTKIMAGEPIPELINE_HH
#define G4VTKIMAGEPIPELINE_HH

#include "G4Transform3D.hh"
#include "G4Types.hh"
#include "G4VVtkPipeline.hh"

#include <vtkImageData.h>
#include <vtkImageReader2.h>
#include <vtkImageReader2Factory.h>
#include <vtkSmartPointer.h>

#include <vector>

class vtkImageAlgorithm;
class vtkImageActor;

class G4String;
class G4VtkVisContext;

class G4VtkImagePipeline : G4VVtkPipeline
{
  public:
    G4VtkImagePipeline(const G4String& name, const G4VtkVisContext& vc);
    ~G4VtkImagePipeline() override = default;
    void AddFilter(vtkSmartPointer<vtkImageAlgorithm> f) { filters.push_back(f); }
    vtkSmartPointer<vtkImageAlgorithm> GetFilter(G4int iFilter) { return filters[iFilter]; }
    vtkSmartPointer<vtkImageAlgorithm> GetFinalFilter() { return *filters.end(); }

    void AddChildPipeline(G4VtkImagePipeline* child)
    {
      childPipelines.push_back(child);
      if (child->GetDisableParent()) {
        Disable();
      }
    }
    G4VtkImagePipeline* GetChildPipeline(G4int iPipeline) { return childPipelines[iPipeline]; }

    virtual void SetImage(const G4String& fileName);
    virtual void SetTransformation(const G4Transform3D& transformation);

    void Print() override;
    void Modified() override;
    void Clear() override;

    virtual vtkSmartPointer<vtkImageActor> GetActor() { return actor; }

    void Disable() override;
    void Enable() override;

  private:
    std::vector<vtkSmartPointer<vtkImageAlgorithm>>
      filters;  // derived types can store filters in this vector
    std::vector<G4VtkImagePipeline*> childPipelines;
    vtkSmartPointer<vtkImageActor> actor;  // all pipelines require an actor
};

#endif  // G4VTKIMAGEPIPELINE_HH