/*=========================================================================
 *
 *  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 itkAttributeLabelObject_h
#define itkAttributeLabelObject_h

#include "itkLabelObject.h"
#include "itkLabelMap.h"

namespace itk
{


namespace Functor {

template< typename TLabelObject >
class AttributeLabelObjectAccessor
{
public:
  using LabelObjectType = TLabelObject;
  using AttributeValueType = typename LabelObjectType::AttributeValueType;

  inline const AttributeValueType operator()( const LabelObjectType * labelObject )
    {
    return labelObject->GetAttribute();
    }

  inline void operator()( LabelObjectType * labelObject, AttributeValueType value )
    {
    labelObject->SetAttribute( value );
    }
};

}


/** \class AttributeLabelObject
 *  \brief A LabelObject with a generic attribute
 *
 * The attribute type is defined in the third template parameter.
 * The attribute is then accessible with the GetAttribute() and SetAttribute
 * methods or through the accessor itk::Functor::AttributeLabelObjectAccessor.
 *
 * \author Gaetan Lehmann. Biologie du Developpement et de la Reproduction, INRA de Jouy-en-Josas, France.
 *
 * This implementation was taken from the Insight Journal paper:
 * https://hdl.handle.net/1926/584  or
 * http://www.insight-journal.org/browse/publication/176
 *
 * \sa LabelObject, ShapeLabelObject, StatisticsLabelObject
 *
 * \ingroup DataRepresentation
 * \ingroup ITKLabelMap
 */
template < typename TLabel, unsigned int VImageDimension, typename TAttributeValue >
class AttributeLabelObject : public LabelObject< TLabel, VImageDimension >
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(AttributeLabelObject);

  /** Standard class type aliases */
  using Self = AttributeLabelObject;
  using Superclass = LabelObject< TLabel, VImageDimension >;
  using Pointer = SmartPointer< Self >;
  using LabelObjectType = typename Superclass::LabelObjectType;
  using ConstPointer = SmartPointer< const Self >;
  using ConstWeakPointer = WeakPointer< const Self >;

  /** Method for creation through the object factory. */
  itkNewMacro(Self);

  /** Run-time type information (and related methods). */
  itkTypeMacro(AttributeLabelObject, LabelObject);

  using LabelMapType = LabelMap< Self >;

  static constexpr unsigned int ImageDimension = VImageDimension;

  using IndexType = typename Superclass::IndexType;

  using LabelType = TLabel;

  using LineType = typename Superclass::LineType;

  using LengthType = typename Superclass::LengthType;

  using AttributeValueType = TAttributeValue;

  void SetAttribute( const AttributeValueType & v )
    {
    m_Attribute = v;
    }

  const AttributeValueType & GetAttribute() const
    {
    return m_Attribute;
    }

  AttributeValueType GetAttribute()
    {
    return m_Attribute;
    }

  template< typename TSourceLabelObject >
  void CopyAttributesFrom( const TSourceLabelObject * src )
    {
    itkAssertOrThrowMacro ( ( src != nullptr ), "Null Pointer" );
    Superclass::template CopyAttributesFrom<TSourceLabelObject>( src );

    m_Attribute = src->GetAttribute();
    }

  template< typename TSourceLabelObject >
  void CopyAllFrom(const TSourceLabelObject *src)
    {
    itkAssertOrThrowMacro ( ( src != nullptr ), "Null Pointer" );
    this->template CopyLinesFrom<TSourceLabelObject>( src );
    this->template CopyAttributesFrom<TSourceLabelObject>( src );
    }

protected:
  AttributeLabelObject()
    {
    // how to initialize the attribute ?
    }


  void PrintSelf(std::ostream& os, Indent indent) const override
    {
    Superclass::PrintSelf( os, indent );

    os << indent << "Attribute: " << m_Attribute << std::endl;
    }

private:
  AttributeValueType m_Attribute;


};

} // end namespace itk

#endif
