/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  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.txt
 *
 *  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 itkNumericTraitsArrayPixel_h
#define itkNumericTraitsArrayPixel_h

#include "itkNumericTraits.h"
#include "itkArray.h"

namespace itk
{
/** \brief NumericTraits for Array
 * \tparam T type of the array component
 */
template< typename T >
class NumericTraits< Array< T > >
{
private:

  using ElementAbsType = typename NumericTraits< T >::AbsType;
  using ElementAccumulateType = typename NumericTraits< T >::AccumulateType;
  using ElementFloatType = typename NumericTraits< T >::FloatType;
  using ElementPrintType = typename NumericTraits< T >::PrintType;
  using ElementRealType = typename NumericTraits< T >::RealType;

public:

  /** Return the type of the native component type. */
  using ValueType = T;
  using Self = Array< T >;

  /** Unsigned component type */
  using AbsType = Array< ElementAbsType >;

  /** Accumulation of addition and multiplication. */
  using AccumulateType = Array< ElementAccumulateType >;

  /** Typedef for operations that use floating point instead of real precision
    */
  using FloatType = Array< ElementFloatType >;

  /** Return the type that can be printed. */
  using PrintType = Array< ElementPrintType >;

  /** Type for real-valued scalar operations. */
  using RealType = Array< ElementRealType >;

  /** Type for real-valued scalar operations. */
  using ScalarRealType = ElementRealType;

  /** Measurement vector type */
  using MeasurementVectorType = Self;

  /** Component wise defined element
   *
   * \note minimum value for floating pointer types is defined as
   * minimum positive normalize value.
   */
  static const Self max(const Self & a)
  {
    Self b( a.Size() );

    b.Fill( NumericTraits< T >::max() );
    return b;
  }

  static const Self min(const Self & a)
  {
    Self b( a.Size() );

    b.Fill( NumericTraits< T >::min() );
    return b;
  }

  static const Self ZeroValue(const Self  & a)
  {
    Self b( a.Size() );

    b.Fill(NumericTraits< T >::ZeroValue());
    return b;
  }

  static const Self OneValue(const Self & a)
  {
    Self b( a.Size() );

    b.Fill(NumericTraits< T >::OneValue());
    return b;
  }

  static const Self NonpositiveMin(const Self & a)
  {
    Self b( a.Size() );
    b.Fill( NumericTraits< T >::NonpositiveMin() );
    return b;
  }

  static constexpr bool IsSigned = NumericTraits< ValueType >::IsSigned;
  static constexpr bool IsInteger = NumericTraits< ValueType >::IsInteger;
  static constexpr bool IsComplex = NumericTraits< ValueType >::IsComplex;

  /** Set the length of the input array and fill it with zeros. */
  static void SetLength(Array< T > & m, const unsigned int s)
  {
    m.SetSize(s);
    m.Fill(NumericTraits< T >::ZeroValue());
  }

  /** Get the length of the input array. */
  static unsigned int GetLength(const Array< T > & m)
  {
    return m.GetSize();
  }

  static void AssignToArray( const Self & v, MeasurementVectorType & mv )
  {
    mv = v;
  }

  template<typename TArray>
  static void AssignToArray( const Self & v, TArray & mv )
  {
    for( unsigned int i=0; i<GetLength(v); i++ )
      {
      mv[i] = v[i];
      }
  }

};
} // end namespace itk

#endif // itkNumericTraitsArrayPixel_h
