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

  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   vtkAMROutlineRepresentation
 * @brief   a simple outline representation for AMR
 * datasets that supports streaming.
 *
 * vtkAMROutlineRepresentation is a simple representation for Overlapping-AMR
 * datasets that with streaming capabilities. It demonstrates how a
 * representation can exploit streaming capabilities provided by ParaView's
 * Render View (vtkPVRenderView).
*/

#ifndef vtkAMROutlineRepresentation_h
#define vtkAMROutlineRepresentation_h

#include "vtkBoundingBox.h" // needed for vtkBoundingBox.
#include "vtkPVDataRepresentation.h"
#include "vtkSmartPointer.h" // for smart pointer.
#include "vtkWeakPointer.h"  // for weak pointer.

class vtkAMRStreamingPriorityQueue;
class vtkCompositePolyDataMapper2;
class vtkPVLODActor;

class VTKPVCLIENTSERVERCORERENDERING_EXPORT vtkAMROutlineRepresentation
  : public vtkPVDataRepresentation
{
public:
  static vtkAMROutlineRepresentation* New();
  vtkTypeMacro(vtkAMROutlineRepresentation, vtkPVDataRepresentation);
  void PrintSelf(ostream& os, vtkIndent indent) VTK_OVERRIDE;

  /**
   * Overridden to handle various view passes.
   */
  int ProcessViewRequest(vtkInformationRequestKey* request_type, vtkInformation* inInfo,
    vtkInformation* outInfo) VTK_OVERRIDE;

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

protected:
  vtkAMROutlineRepresentation();
  ~vtkAMROutlineRepresentation() 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) VTK_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) VTK_OVERRIDE;

  /**
   * Fill input port information.
   */
  int FillInputPortInformation(int port, vtkInformation* info) VTK_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* rqst, vtkInformationVector** inputVector,
    vtkInformationVector* outputVector) VTK_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) VTK_OVERRIDE;

  /**
   * Generate the outline for the current input.
   * When not in StreamingUpdate, this also initializes the priority queue since
   * the input AMR may have totally changed, including its structure.
   */
  int RequestData(vtkInformation* rqst, vtkInformationVector** inputVector,
    vtkInformationVector* outputVector) VTK_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(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;

  /**
   * Helps us keep track of the data being rendered.
   */
  vtkWeakPointer<vtkDataObject> RenderedData;

  /**
   * 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;

  //@{
  /**
   * Actor used to render the outlines in the view.
   */
  vtkSmartPointer<vtkCompositePolyDataMapper2> Mapper;
  vtkSmartPointer<vtkPVLODActor> Actor;
  //@}

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

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