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

  Program:   Visualization Toolkit
  Module:    vtkRandomGraphSource.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm 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.

=========================================================================*/
/*-------------------------------------------------------------------------
  Copyright 2008 Sandia Corporation.
  Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
  the U.S. Government retains certain rights in this software.
-------------------------------------------------------------------------*/
/**
 * @class   vtkRandomGraphSource
 * @brief   a graph with random edges
 *
 *
 * Generates a graph with a specified number of vertices, with the density of
 * edges specified by either an exact number of edges or the probability of
 * an edge.  You may additionally specify whether to begin with a random
 * tree (which enforces graph connectivity).
 *
*/

#ifndef vtkRandomGraphSource_h
#define vtkRandomGraphSource_h

#include "vtkInfovisCoreModule.h" // For export macro
#include "vtkGraphAlgorithm.h"

class vtkGraph;
class vtkPVXMLElement;

class VTKINFOVISCORE_EXPORT vtkRandomGraphSource : public vtkGraphAlgorithm
{
public:
  static vtkRandomGraphSource* New();
  vtkTypeMacro(vtkRandomGraphSource,vtkGraphAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  //@{
  /**
   * The number of vertices in the graph.
   */
  vtkGetMacro(NumberOfVertices, int);
  vtkSetClampMacro(NumberOfVertices, int, 0, VTK_INT_MAX);
  //@}

  //@{
  /**
   * If UseEdgeProbability is off, creates a graph with the specified number
   * of edges.  Duplicate (parallel) edges are allowed.
   */
  vtkGetMacro(NumberOfEdges, int);
  vtkSetClampMacro(NumberOfEdges, int, 0, VTK_INT_MAX);
  //@}

  //@{
  /**
   * If UseEdgeProbability is on, adds an edge with this probability between 0 and 1
   * for each pair of vertices in the graph.
   */
  vtkGetMacro(EdgeProbability, double);
  vtkSetClampMacro(EdgeProbability, double, 0.0, 1.0);
  //@}

  //@{
  /**
   * When set, includes edge weights in an array named "edge_weights".
   * Defaults to off.  Weights are random between 0 and 1.
   */
  vtkSetMacro(IncludeEdgeWeights, bool);
  vtkGetMacro(IncludeEdgeWeights, bool);
  vtkBooleanMacro(IncludeEdgeWeights, bool);
  //@}

  //@{
  /**
   * The name of the edge weight array. Default "edge weight".
   */
  vtkSetStringMacro(EdgeWeightArrayName);
  vtkGetStringMacro(EdgeWeightArrayName);
  //@}

  //@{
  /**
   * When set, creates a directed graph, as opposed to an undirected graph.
   */
  vtkSetMacro(Directed, bool);
  vtkGetMacro(Directed, bool);
  vtkBooleanMacro(Directed, bool);
  //@}

  //@{
  /**
   * When set, uses the EdgeProbability parameter to determine the density
   * of edges.  Otherwise, NumberOfEdges is used.
   */
  vtkSetMacro(UseEdgeProbability, bool);
  vtkGetMacro(UseEdgeProbability, bool);
  vtkBooleanMacro(UseEdgeProbability, bool);
  //@}

  //@{
  /**
   * When set, builds a random tree structure first, then adds additional
   * random edges.
   */
  vtkSetMacro(StartWithTree, bool);
  vtkGetMacro(StartWithTree, bool);
  vtkBooleanMacro(StartWithTree, bool);
  //@}

  //@{
  /**
   * If this flag is set to true, edges where the source and target
   * vertex are the same can be generated.  The default is to forbid
   * such loops.
   */
  vtkSetMacro(AllowSelfLoops, bool);
  vtkGetMacro(AllowSelfLoops, bool);
  vtkBooleanMacro(AllowSelfLoops, bool);
  //@}

  //@{
  /**
   * When set, multiple edges from a source to a target vertex are
   * allowed. The default is to forbid such loops.
   */
  vtkSetMacro(AllowParallelEdges, bool);
  vtkGetMacro(AllowParallelEdges, bool);
  vtkBooleanMacro(AllowParallelEdges, bool);
  //@}

  //@{
  /**
   * Add pedigree ids to vertex and edge data.
   */
  vtkSetMacro(GeneratePedigreeIds, bool);
  vtkGetMacro(GeneratePedigreeIds, bool);
  vtkBooleanMacro(GeneratePedigreeIds, bool);
  //@}

  //@{
  /**
   * The name of the vertex pedigree id array. Default "vertex id".
   */
  vtkSetStringMacro(VertexPedigreeIdArrayName);
  vtkGetStringMacro(VertexPedigreeIdArrayName);
  //@}

  //@{
  /**
   * The name of the edge pedigree id array. Default "edge id".
   */
  vtkSetStringMacro(EdgePedigreeIdArrayName);
  vtkGetStringMacro(EdgePedigreeIdArrayName);
  //@}

  //@{
  /**
   * Control the seed used for pseudo-random-number generation.
   * This ensures that vtkRandomGraphSource can produce repeatable
   * results.
   */
  vtkSetMacro(Seed, int);
  vtkGetMacro(Seed, int);
  //@}

protected:
  vtkRandomGraphSource();
  ~vtkRandomGraphSource() override;
  int NumberOfVertices;
  int NumberOfEdges;
  double EdgeProbability;
  bool Directed;
  bool UseEdgeProbability;
  bool StartWithTree;
  bool IncludeEdgeWeights;
  bool AllowSelfLoops;
  bool AllowParallelEdges;
  bool GeneratePedigreeIds;
  int Seed;
  char* EdgeWeightArrayName;
  char* VertexPedigreeIdArrayName;
  char* EdgePedigreeIdArrayName;

  int RequestData(
    vtkInformation*,
    vtkInformationVector**,
    vtkInformationVector*) override;

  /**
   * Creates directed or undirected output based on Directed flag.
   */
  int RequestDataObject(vtkInformation*,
                                vtkInformationVector** inputVector,
                                vtkInformationVector* outputVector) override;

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

#endif

