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

Program:   Visualization Toolkit
Module:    vtkOrderStatistics.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 2011 Sandia Corporation.
  Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
  the U.S. Government retains certain rights in this software.
  -------------------------------------------------------------------------*/
/**
 * @class   vtkOrderStatistics
 * @brief   A class for univariate order statistics
 *
 *
 * Given a selection of columns of interest in an input data table, this
 * class provides the following functionalities, depending on the
 * execution mode it is executed in:
 * * Learn: calculate histogram.
 * * Derive: calculate PDFs and arbitrary quantiles. Provide specific names when 5-point
 *   statistics (minimum, 1st quartile, median, third quartile, maximum) requested.
 * * Assess: given an input data set and a set of q-quantiles, label each datum
 *   either with the quantile interval to which it belongs, or 0 if it is smaller
 *   than smaller quantile, or q if it is larger than largest quantile.
 * * Test: calculate Kolmogorov-Smirnov goodness-of-fit statistic between CDF based on
 *   model quantiles, and empirical CDF
 *
 * @par Thanks:
 * Thanks to Philippe Pebay and David Thompson from Sandia National Laboratories
 * for implementing this class.
 * Updated by Philippe Pebay, Kitware SAS 2012
*/

#ifndef vtkOrderStatistics_h
#define vtkOrderStatistics_h

#include "vtkFiltersStatisticsModule.h" // For export macro
#include "vtkStatisticsAlgorithm.h"

class vtkMultiBlockDataSet;
class vtkStringArray;
class vtkTable;
class vtkVariant;

class VTKFILTERSSTATISTICS_EXPORT vtkOrderStatistics : public vtkStatisticsAlgorithm
{
public:
  vtkTypeMacro(vtkOrderStatistics, vtkStatisticsAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) VTK_OVERRIDE;
  static vtkOrderStatistics* New();

  /**
   * The type of quantile definition.
   */
  enum QuantileDefinitionType {
    InverseCDF              = 0, // Identical to method 1 of R
    InverseCDFAveragedSteps = 1, // Identical to method 2 of R, ignored for non-numeric types
    NearestObservation      = 2  // Identical to method 3 of R
  };

  //@{
  /**
   * Set/Get the number of quantiles (with uniform spacing).
   */
  vtkSetMacro( NumberOfIntervals, vtkIdType );
  vtkGetMacro( NumberOfIntervals, vtkIdType );
  //@}

  //@{
  /**
   * Set the quantile definition.
   */
  vtkSetMacro( QuantileDefinition, QuantileDefinitionType );
  void SetQuantileDefinition ( int );
  //@}

  //@{
  /**
   * Set/Get whether quantization will be allowed to enforce maximum histogram size.
   */
  vtkSetMacro( Quantize, bool );
  vtkGetMacro( Quantize, bool );
  //@}

  //@{
  /**
   * Set/Get the maximum histogram size.
   * This maximum size is enforced only when Quantize is TRUE.
   */
  vtkSetMacro( MaximumHistogramSize, vtkIdType );
  vtkGetMacro( MaximumHistogramSize, vtkIdType );
  //@}

  /**
   * Get the quantile definition.
   */
  vtkIdType GetQuantileDefinition() { return static_cast<vtkIdType>( this->QuantileDefinition ); }

  /**
   * A convenience method (in particular for access from other applications) to
   * set parameter values.
   * Return true if setting of requested parameter name was excuted, false otherwise.
   */
  bool SetParameter( const char* parameter,
                     int index,
                     vtkVariant value ) VTK_OVERRIDE;

  /**
   * Given a collection of models, calculate aggregate model
   * NB: not implemented
   */
  void Aggregate( vtkDataObjectCollection*,
                          vtkMultiBlockDataSet* ) VTK_OVERRIDE { return; };

protected:
  vtkOrderStatistics();
  ~vtkOrderStatistics() VTK_OVERRIDE;

  /**
   * Execute the calculations required by the Learn option.
   */
  void Learn( vtkTable*,
              vtkTable*,
              vtkMultiBlockDataSet* ) VTK_OVERRIDE;

  /**
   * Execute the calculations required by the Derive option.
   */
  void Derive( vtkMultiBlockDataSet* ) VTK_OVERRIDE;

  /**
   * Execute the calculations required by the Test option.
   */
  void Test( vtkTable*,
             vtkMultiBlockDataSet*,
             vtkTable* ) VTK_OVERRIDE;

  /**
   * Execute the calculations required by the Assess option.
   */
  void Assess( vtkTable* inData,
               vtkMultiBlockDataSet* inMeta,
               vtkTable* outData ) VTK_OVERRIDE
  { this->Superclass::Assess( inData, inMeta, outData, 1 ); }

  /**
   * Provide the appropriate assessment functor.
   */
  void SelectAssessFunctor( vtkTable* outData,
                            vtkDataObject* inMeta,
                            vtkStringArray* rowNames,
                            AssessFunctor*& dfunc ) VTK_OVERRIDE;

  vtkIdType NumberOfIntervals;
  QuantileDefinitionType QuantileDefinition;
  bool Quantize;
  vtkIdType MaximumHistogramSize;

private:
  vtkOrderStatistics(const vtkOrderStatistics&) VTK_DELETE_FUNCTION;
  void operator=(const vtkOrderStatistics&) VTK_DELETE_FUNCTION;
};

#endif