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

  Program:   ParaView
  Module:    $RCSfile$

  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   vtkAMRStreamingVolumeRepresentation
 * @brief   representation used for volume
 * rendering AMR datasets with ability to stream blocks.
 *
 * vtkAMRStreamingVolumeRepresentation  is a representation used for volume
 * rendering AMR datasets with ability to stream blocks from the input pipeline.
 */

#ifndef vtkAMRStreamingVolumeRepresentation_h
#define vtkAMRStreamingVolumeRepresentation_h

#include "vtkBoundingBox.h" // needed for vtkBoundingBox.
#include "vtkPVDataRepresentation.h"
#include "vtkRemotingViewsModule.h" // for export macros
#include "vtkSmartPointer.h"        // needed for vtkSmartPointer.

class vtkAMRStreamingPriorityQueue;
class vtkColorTransferFunction;
class vtkImageData;
class vtkOverlappingAMR;
class vtkPiecewiseFunction;
class vtkPVLODVolume;
class vtkPVRenderView;
class vtkResampledAMRImageSource;
class vtkSmartVolumeMapper;
class vtkVolumeProperty;
class vtkAMRVolumeMapper;

class VTKREMOTINGVIEWS_EXPORT vtkAMRStreamingVolumeRepresentation : public vtkPVDataRepresentation
{
public:
  static vtkAMRStreamingVolumeRepresentation* New();
  vtkTypeMacro(vtkAMRStreamingVolumeRepresentation, vtkPVDataRepresentation);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  enum ResamplingModes
  {
    RESAMPLE_OVER_DATA_BOUNDS = 0,
    RESAMPLE_USING_VIEW_FRUSTUM = 1
  };

  ///@{
  /**
   * This control the logic used to determine how to place the resampling grid
   * within the AMR bounds.
   * \li RESAMPLE_OVER_DATA_BOUNDS implies that the amr volume is
   * set to the data bounds and is not updated as the user interacts.
   * \li RESAMPLE_USING_VIEW_FRUSTUM indicates that the uniform grid must be
   * repositioned when the camera changes using the current view frustum.
   */
  void SetResamplingMode(int val);
  vtkGetMacro(ResamplingMode, int);
  ///@}

  /**
   * 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.
   * Overridden to skip processing when visibility if off.
   */
  int ProcessViewRequest(vtkInformationRequestKey* request_type, vtkInformation* inInfo,
    vtkInformation* outInfo) override;

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

  /**
   * Get/Set the resample buffer size. This controls the resolution at which the
   * data is resampled.
   */
  void SetNumberOfSamples(int x, int y, int z);

  ///@{
  /**
   * Set the number of blocks to request at a given time on a single process
   * when streaming.
   */
  vtkSetClampMacro(StreamingRequestSize, int, 1, 10000);
  vtkGetMacro(StreamingRequestSize, int);
  ///@}

  ///@{
  /**
   * Set the input data arrays that this algorithm will process.
   */
  void SetInputArrayToProcess(
    int idx, int port, int connection, int fieldAssociation, const char* name) override;
  void SetInputArrayToProcess(
    int idx, int port, int connection, int fieldAssociation, int fieldAttributeType) override
  {
    this->Superclass::SetInputArrayToProcess(
      idx, port, connection, fieldAssociation, fieldAttributeType);
  }
  void SetInputArrayToProcess(int idx, vtkInformation* info) override
  {
    this->Superclass::SetInputArrayToProcess(idx, info);
  }
  void SetInputArrayToProcess(int idx, int port, int connection, const char* fieldAssociation,
    const char* attributeTypeorName) override
  {
    this->Superclass::SetInputArrayToProcess(
      idx, port, connection, fieldAssociation, attributeTypeorName);
  }
  ///@}

  //***************************************************************************
  // Scalar coloring API (forwarded for vtkSmartVolumeMapper.

  //***************************************************************************
  // Forwarded to Actor.
  void SetOrientation(double, double, double);
  void SetOrigin(double, double, double);
  void SetPickable(int val);
  void SetPosition(double, double, double);
  void SetScale(double, double, double);

  //***************************************************************************
  // Forwarded to vtkVolumeProperty.
  void SetInterpolationType(int val);
  void SetColor(vtkColorTransferFunction* lut);
  void SetScalarOpacity(vtkPiecewiseFunction* pwf);
  void SetScalarOpacityUnitDistance(double val);
  void SetAmbient(double);
  void SetDiffuse(double);
  void SetSpecular(double);
  void SetSpecularPower(double);
  void SetShade(bool);
  void SetIndependantComponents(bool);

  //***************************************************************************
  // Forwarded to vtkSmartVolumeMapper.
  void SetRequestedRenderMode(int);

protected:
  vtkAMRStreamingVolumeRepresentation();
  ~vtkAMRStreamingVolumeRepresentation() 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;

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

  /**
   * Overridden to check if the input pipeline is streaming capable. This method
   * should check if streaming is enabled i.e. vtkPVView::GetEnableStreaming()
   * and the input pipeline provides necessary AMR meta-data.
   */
  int RequestInformation(vtkInformation* request, vtkInformationVector** inputVector,
    vtkInformationVector* outputVector) override;

  /**
   * Setup the block request. During StreamingUpdate, this will request the
   * blocks based on priorities determined by the vtkAMRStreamingPriorityQueue,
   * otherwise it doesn't make any specific request. AMR sources can treat the
   * absence of specific block request to mean various things. It's expected
   * that read only the root block (or a few more) in that case.
   */
  int RequestUpdateExtent(vtkInformation* request, vtkInformationVector** inputVector,
    vtkInformationVector* outputVector) override;

  /**
   * Process the current input for volume rendering (if anything).
   * When not in StreamingUpdate, this also initializes the priority queue since
   * the input AMR may have totally changed, including its structure.
   */
  int RequestData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) override;

  ///@{
  /**
   * Returns true when the input pipeline supports streaming. It is set in
   * RequestInformation().
   */
  vtkGetMacro(StreamingCapablePipeline, bool);
  ///@}

  ///@{
  /**
   * Returns true when StreamingUpdate() is being processed.
   */
  vtkGetMacro(InStreamingUpdate, bool);
  ///@}

  /**
   * Returns true if this representation has a "next piece" that it streamed.
   * This method will update the PriorityQueue using the view planes specified
   * and then call Update() on the representation, making it reexecute and
   * regenerate the outline for the next "piece" of data.
   */
  bool StreamingUpdate(vtkPVRenderView* view, const double view_planes[24]);

  /**
   * This is the data object generated processed by the most recent call to
   * RequestData() while not streaming.
   * This is non-empty only on the data-server nodes.
   */
  vtkSmartPointer<vtkDataObject> ProcessedData;

  /**
   * This is the data object generated processed by the most recent call to
   * RequestData() while streaming.
   * This is non-empty only on the data-server nodes.
   */
  vtkSmartPointer<vtkDataObject> ProcessedPiece;

  /**
   * vtkAMRStreamingPriorityQueue is a helper class we used to compute the order
   * in which to request blocks from the input pipeline. Implementations can
   * come up with their own rules to decide the request order based on
   * application and data type.
   */
  vtkSmartPointer<vtkAMRStreamingPriorityQueue> PriorityQueue;

  /**
   * vtkImageData source used to resample an AMR dataset into a uniform grid
   * suitable for volume rendering.
   */
  vtkSmartPointer<vtkResampledAMRImageSource> Resampler;

  ///@{
  /**
   * Rendering components.
   */
  vtkSmartPointer<vtkSmartVolumeMapper> VolumeMapper;
  vtkSmartPointer<vtkAMRVolumeMapper> AMRVolumeMapper;
  vtkSmartPointer<vtkVolumeProperty> Property;
  vtkSmartPointer<vtkPVLODVolume> Actor;
  ///@}

  /**
   * Used to keep track of data bounds.
   */
  vtkBoundingBox DataBounds;

  int ResamplingMode;
  int StreamingRequestSize;

private:
  vtkAMRStreamingVolumeRepresentation(const vtkAMRStreamingVolumeRepresentation&) = delete;
  void operator=(const vtkAMRStreamingVolumeRepresentation&) = delete;

  /**
   * This flag is set to true if the input pipeline is streaming capable in
   * RequestInformation(). Note that in client-server mode, this is valid only
   * on the data-server nodes since all other nodes don't have input pipelines
   * connected, they cannot indicate if the pipeline supports streaming.
   */
  bool StreamingCapablePipeline;

  /**
   * This flag is used to indicate that the representation is being updated
   * during the streaming pass. RequestData() can use this flag to reset
   * internal datastructures when the input changes for non-streaming reasons
   * and we need to clear our streaming buffers since the streamed data is no
   * longer valid.
   */
  bool InStreamingUpdate;
};

#endif
