/*=========================================================================

  Program:   ParaView
  Module:    vtkHyperTreeGridRepresentation.h

  Copyright (c) Kitware, Inc.
  All rights reserved.
  See Copyright.txt or http://www.paraview.org/HTML/Copyright.html for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
/**
 * @class   vtkHyperTreeGridRepresentation
 * @brief   representation for showing vtkHyperTreeGrid as
 * with optimized rendering for 2D datasets.
 *
 * vtkHyperTreeGridRepresentation is a representation for showing HyperTreeGrid.
 * When given a 2D dataset, the new HTG representation uses the specific HTG
 * mapper that benefits from the AdaptiveDecimation filter to only render part
 * that are shown on the camera frustum. This requires the Parallel Profection
 * to be enabled.
 * @par Thanks:
 * This work was supported by CEA/DIF
 * Commissariat a l'Energie Atomique, Centre DAM Ile-De-France, Arpajon, France.
 */

#ifndef vtkHyperTreeGridRepresentation_h
#define vtkHyperTreeGridRepresentation_h

#include "vtkPVDataRepresentation.h"

#include "vtkNew.h"                 // for vtkNew
#include "vtkPVLODActor.h"          // Upcast in vtkActor
#include "vtkProperty.h"            // needed for VTK_POINTS etc.
#include "vtkRemotingViewsModule.h" // needed for exports

#include <string> // needed for std::string

class vtkOpenGLHyperTreeGridMapper;
class vtkPVGeometryFilter;
class vtkPiecewiseFunction;
class vtkScalarsToColors;
class vtkTexture;

class VTKREMOTINGVIEWS_EXPORT vtkHyperTreeGridRepresentation : public vtkPVDataRepresentation
{

public:
  static vtkHyperTreeGridRepresentation* New();
  vtkTypeMacro(vtkHyperTreeGridRepresentation, vtkPVDataRepresentation);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  /**
   * vtkAlgorithm::ProcessRequest() equivalent for rendering passes. This is
   * typically called by the vtkView to request meta-data from the
   * representations or ask them to perform certain tasks e.g.
   * PrepareForRendering.
   */
  int ProcessViewRequest(vtkInformationRequestKey* request_type, vtkInformation* inInfo,
    vtkInformation* outInfo) override;

  /**
   * Set the visibility for this representation. When the visibility of
   * representation of false, all view passes are ignored.
   */
  void SetVisibility(bool val) override;

  ///@{
  /**
   * Use adaptive decimation to only render the part inside the camera frustum.
   * Default to false, only works for 2D HTG with parallel projection.
   */
  vtkGetMacro(AdaptiveDecimation, bool);
  vtkSetMacro(AdaptiveDecimation, bool);
  vtkBooleanMacro(AdaptiveDecimation, bool);
  ///@}

  ///@{
  /**
   * Set/Get the lighting properties of the object. vtkHyperTreeGridRepresentation
   * overrides these based of the following conditions:
   * \li When Representation is wireframe or points, it disables diffuse or
   * specular.
   * \li When scalar coloring is employed, it disabled specular.
   * Default vaules: Ambient = 0, Specular = 0, Diffuse = 1.
   *
   * Values are expected to be between 0 and 1.
   */
  vtkSetMacro(Ambient, double);
  vtkSetMacro(Diffuse, double);
  vtkSetMacro(Specular, double);
  vtkGetMacro(Ambient, double);
  vtkGetMacro(Diffuse, double);
  vtkGetMacro(Specular, double);
  ///@}

  enum RepresentationTypes
  {
    WIREFRAME = 1,
    SURFACE,
    SURFACE_WITH_EDGES
  };

  ///@{
  /**
   * Set the representation type: WIREFRAME SURFACE SURFACE_WITH_EDGES.
   * Default is SURFACE.
   */
  vtkSetClampMacro(Representation, int, WIREFRAME, SURFACE_WITH_EDGES);
  vtkGetMacro(Representation, int);
  ///@}

  /**
   * Overload to set representation type using string. Accepted strings are:
   * "Wireframe", "Surface" and "Surface With Edges".
   */
  virtual void SetRepresentation(const char*);

  /**
   * Returns the data object that is rendered from the given input port.
   */
  vtkDataObject* GetRenderedDataObject(int port) override;

  /**
   * Use Outline representation is **NOT SUPPORTED** by this representation.
   */
  void SetUseOutline(int);

  //***************************************************************************
  ///@{
  /**
   *  Forwarded to vtkProperty.
   */
  virtual void SetAmbientColor(double r, double g, double b);
  virtual void SetBaseIOR(double val);
  virtual void SetBaseColorTexture(vtkTexture* tex);
  virtual void SetCoatIOR(double val);
  virtual void SetCoatStrength(double val);
  virtual void SetCoatRoughness(double val);
  virtual void SetCoatColor(double a, double b, double c);
  virtual void SetCoatNormalScale(double val);
  virtual void SetColor(double r, double g, double b);
  virtual void SetDiffuseColor(double r, double g, double b);
  virtual void SetEdgeColor(double r, double g, double b);
  virtual void SetEdgeTint(double r, double g, double b);
  virtual void SetEmissiveFactor(double rval, double gval, double bval);
  virtual void SetEmissiveTexture(vtkTexture* tex);
  virtual void SetInteractiveSelectionColor(double r, double g, double b);
  virtual void SetInterpolation(int val);
  virtual void SetLineWidth(double val);
  virtual void SetMaterial(std::string name);
  virtual void SetMaterialTexture(vtkTexture* tex);
  virtual void SetMetallic(double val);
  virtual void SetNormalScale(double val);
  virtual void SetNormalTexture(vtkTexture* tex);
  virtual void SetOcclusionStrength(double val);
  virtual void SetOpacity(double val);
  virtual void SetPointSize(double val);
  virtual void SetRenderLinesAsTubes(bool);
  virtual void SetRenderPointsAsSpheres(bool);
  virtual void SetRoughness(double val);
  virtual void SetSpecularColor(double r, double g, double b);
  virtual void SetSpecularPower(double val);
  ///@}

  //***************************************************************************
  ///@{
  /**
   * Forwarded to Actor.
   */
  virtual void SetFlipTextures(bool);
  virtual void SetOrientation(double, double, double);
  virtual void SetOrigin(double, double, double);
  virtual void SetPickable(int val);
  virtual void SetPosition(double, double, double);
  virtual void SetScale(double, double, double);
  virtual void SetTexture(vtkTexture*);
  virtual void SetUserTransform(const double[16]);
  ///@}

  //***************************************************************************
  ///@{
  /**
   * Forwarded to OSPray (via the Actor)
   */
  virtual void SetEnableScaling(int val);
  virtual void SetScalingArrayName(const char* val);
  virtual void SetScalingFunction(vtkPiecewiseFunction* pwf);
  virtual void SetMaterial(const char* val);
  virtual void SetLuminosity(double val);
  ///@}

  //***************************************************************************
  ///@{
  /**
   * Forwarded to all textures (and stored for later re-use)
   */
  virtual void SetRepeatTextures(bool);
  vtkGetMacro(RepeatTextures, bool);
  virtual void SetInterpolateTextures(bool);
  vtkGetMacro(InterpolateTextures, bool);
  virtual void SetUseMipmapTextures(bool);
  vtkGetMacro(UseMipmapTextures, bool);
  ///@}

  //***************************************************************************
  ///@{
  /**
   * Forwarded to Mapper and LODMapper.
   */
  virtual void SetInterpolateScalarsBeforeMapping(int val);
  virtual void SetLookupTable(vtkScalarsToColors* val);
  ///@}

  /**
   * Sets if scalars are mapped through a color-map or are used
   * directly as colors (rgb).
   * false: maps to VTK_COLOR_MODE_DIRECT_SCALARS
   * true: maps to VTK_COLOR_MODE_MAP_SCALARS
   * @see vtkScalarsToColors::MapScalars
   */
  virtual void SetMapScalars(bool val);

  /**
   * Turn on/off flag to control whether the mapper's data is static. Static data
   * means that the mapper does not propagate updates down the pipeline, greatly
   * decreasing the time it takes to update many mappers. This should only be
   * used if the data never changes.
   */
  virtual void SetStatic(int val);

  /**
   * Sets the selection used by the mapper.
   */
  virtual void SetSelection(vtkSelection* selection);

  /**
   * Provides access to the actor used by this representation.
   */
  vtkActor* GetActor() { return this->GetRenderedProp(); }

  /**
   * Convenience method to get the array name used to scalar color with.
   * Can return nullptr if:
   *  * GetInputArrayInformation returns nullptr, of
   *  * the Input array information has no FIELD_ASSOCIATION, or
   *  * the Input array information has no FIELD_NAME.
   */
  const char* GetColorArrayName();

  ///@{
  /**
   * Specify whether or not to shader replacements string must be used.
   */
  virtual void SetUseShaderReplacements(bool);
  vtkGetMacro(UseShaderReplacements, bool);
  ///@}

  /**
   * Specify shader replacements using a Json string.
   * Please refer to the XML definition of the property for details about
   * the expected Json string format.
   * Only used if UseShaderReplacements is true.
   */
  virtual void SetShaderReplacements(const char*);

protected:
  vtkHyperTreeGridRepresentation();
  ~vtkHyperTreeGridRepresentation() override;

  /**
   * This method is called in the constructor. If the subclasses override any of
   * the iVar vtkObject's of this class e.g. the Mappers, GeometryFilter etc.,
   * they should call this method again in their constructor. It must be totally
   * safe to call this method repeatedly.
   */
  virtual void SetupDefaults();

  /**
   * Fill input port information.
   */
  int FillInputPortInformation(int port, vtkInformation* info) override;

  /**
   * Subclasses should override this to connect inputs to the internal pipeline
   * as necessary. Since most representations are "meta-filters" (i.e. filters
   * containing other filters), you should create shallow copies of your input
   * before connecting to the internal pipeline. The convenience method
   * GetInternalOutputPort will create a cached shallow copy of a specified
   * input for you. The related helper functions GetInternalAnnotationOutputPort,
   * GetInternalSelectionOutputPort should be used to obtain a selection or
   * annotation port whose selections are localized for a particular input data object.
   */
  int RequestData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) override;

  /**
   * Adds the representation to the view.  This is called from
   * vtkView::AddRepresentation().  Subclasses should override this method.
   * Returns true if the addition succeeds.
   */
  bool AddToView(vtkView* view) override;

  /**
   * Removes the representation to the view.  This is called from
   * vtkView::RemoveRepresentation().  Subclasses should override this method.
   * Returns true if the removal succeeds.
   */
  bool RemoveFromView(vtkView* view) override;

  /**
   * Passes on parameters to vtkProperty and vtkMapper
   */
  virtual void UpdateColoringParameters();

  /**
   * Used in ConvertSelection to locate the prop used for actual rendering.
   */
  virtual vtkActor* GetRenderedProp() { return this->Actor; }

  /**
   * Update the mapper with the shader replacement strings if feature is enabled.
   */
  void UpdateShaderReplacements();

  /**
   * Returns true if this representation has translucent geometry. Unlike
   * `vtkActor::HasTranslucentPolygonalGeometry` which cannot be called in
   * `Update`, this method can be called in `Update` i.e. before the mapper has
   * all the data to decide if it is doing translucent rendering.
   */
  virtual bool NeedsOrderedCompositing();

  /*
   * Fields
   */

  // Specific to HTG mapper
  vtkNew<vtkOpenGLHyperTreeGridMapper> Mapper;
  bool AdaptiveDecimation = true;

  // Generic fields
  vtkNew<vtkPVLODActor> Actor;
  vtkNew<vtkProperty> Property;

  int Representation = SURFACE;

  bool RepeatTextures = false;
  bool InterpolateTextures = false;
  bool UseMipmapTextures = false;
  double Ambient = 0.0;
  double Specular = 0.0;
  double Diffuse = 1.0;
  double VisibleDataBounds[6];
  bool UseShaderReplacements = false;
  std::string ShaderReplacementsString;

private:
  vtkHyperTreeGridRepresentation(const vtkHyperTreeGridRepresentation&) = delete;
  void operator=(const vtkHyperTreeGridRepresentation&) = delete;
};

#endif
