/*
 * Copyright (C) 2005-2020 Centre National d'Etudes Spatiales (CNES)
 *
 * This file is part of Orfeo Toolbox
 *
 *     https://www.orfeo-toolbox.org/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef otbPointSetAndValuesFunction_h
#define otbPointSetAndValuesFunction_h

#include "itkFunctionBase.h"
#include "itkContinuousIndex.h"
#include "itkVectorContainer.h"
#include "itkPointSet.h"

namespace otb
{
/** \class PointSetAndValuesFunction
 *  \brief Base class for function needing a point set and a set of associated value to compute the output.
 *
 * \ingroup OTBPointSet
 */
template <class TPointSet, class TValue, class TCoordRep = double>
class ITK_EXPORT PointSetAndValuesFunction : public itk::FunctionBase<itk::Point<TCoordRep, TPointSet::PointDimension>, TValue>
{
public:
  /** Standard typedefs */
  typedef PointSetAndValuesFunction Self;
  typedef itk::FunctionBase<itk::Point<TCoordRep, TPointSet::PointDimension>, TValue> Superclass;
  typedef itk::SmartPointer<Self>       Pointer;
  typedef itk::SmartPointer<const Self> ConstPointer;

  /** Creation through object factory macro */
  itkTypeMacro(PointSetAndValuesFunction, itk::FunctionBase);

  typedef TPointSet                           PointSetType;
  typedef typename PointSetType::ConstPointer PointSetConstPointerType;
  typedef TValue                              ValueType;
  typedef TCoordRep                           CoordRepType;
  typedef typename PointSetType::PointType    PointType;

  typedef itk::Index<PointType::PointDimension> IndexType;
  typedef itk::ContinuousIndex<CoordRepType, PointType::PointDimension> ContinuousIndexType;

  typedef itk::VectorContainer<unsigned long, ValueType> ValueVectorType;
  typedef typename ValueVectorType::ConstPointer ValueVectorPointerType;

  itkSetObjectMacro(ValueVector, ValueVectorType);
  itkGetObjectMacro(ValueVector, ValueVectorType);

  /**
   * Set the point set.
   * \param the point set
   */
  virtual void SetPointSet(const PointSetType* ptr);
  /**
   * Get the point set.
   * \return the point set
   */
  const PointSetType* GetPointSet() const
  {
    return m_PointSet.GetPointer();
  }

  /** Evaluate the function at specified Point position.
   * Subclasses must provide this method. */
  virtual TValue Evaluate(const PointType& point) const = 0;

  /** Evaluate the function at specified Index position.
   * Subclasses must provide this method. */
  virtual TValue EvaluateAtIndex(const IndexType& index) const = 0;

  /** Evaluate the function at specified ContinuousIndex position.
   * Subclasses must provide this method. */
  virtual TValue EvaluateAtContinuousIndex(const ContinuousIndexType& index) const = 0;

protected:
  /** Constructor */
  PointSetAndValuesFunction()
  {
    m_PointSet    = PointSetType::New();
    m_ValueVector = ValueVectorType::New();
  }
  /** Destructor */
  virtual ~PointSetAndValuesFunction()
  {
  }
  /**PrintSelf method */
  virtual void PrintSelf(std::ostream& os, itk::Indent indent) const;

private:
  PointSetAndValuesFunction(const Self&) = delete;
  void operator=(const Self&) = delete;

  /** PointSet */
  PointSetConstPointerType m_PointSet;
  /** value vector */
  ValueVectorPointerType m_ValueVector;
};
} // End namespace otb
#endif
