/*=========================================================================
 *
 *  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 itkMinimumMaximumImageCalculator_hxx
#define itkMinimumMaximumImageCalculator_hxx

#include "itkMinimumMaximumImageCalculator.h"
#include "itkImageRegionConstIteratorWithIndex.h"
#include "itkNumericTraits.h"

namespace itk
{
/**
 * Constructor
 */
template< typename TInputImage >
MinimumMaximumImageCalculator< TInputImage >
::MinimumMaximumImageCalculator()
{
  m_Image = TInputImage::New();
  m_Maximum = NumericTraits< PixelType >::NonpositiveMin();
  m_Minimum = NumericTraits< PixelType >::max();
  m_IndexOfMinimum.Fill(0);
  m_IndexOfMaximum.Fill(0);
  m_RegionSetByUser = false;
}

/**
 * Compute Min and Max of m_Image
 */
template< typename TInputImage >
void
MinimumMaximumImageCalculator< TInputImage >
::Compute(void)
{
  if ( !m_RegionSetByUser )
    {
    m_Region = m_Image->GetRequestedRegion();
    }

  ImageRegionConstIteratorWithIndex< TInputImage > it(m_Image, m_Region);
  m_Maximum = NumericTraits< PixelType >::NonpositiveMin();
  m_Minimum = NumericTraits< PixelType >::max();

  while ( !it.IsAtEnd() )
    {
    const PixelType value = it.Get();
    if ( value > m_Maximum )
      {
      m_Maximum = value;
      m_IndexOfMaximum = it.GetIndex();
      }
    if ( value < m_Minimum )
      {
      m_Minimum = value;
      m_IndexOfMinimum = it.GetIndex();
      }
    ++it;
    }
}

/**
 * Compute the minimum intensity value of the image
 */
template< typename TInputImage >
void
MinimumMaximumImageCalculator< TInputImage >
::ComputeMinimum(void)
{
  if ( !m_RegionSetByUser )
    {
    m_Region = m_Image->GetRequestedRegion();
    }
  ImageRegionConstIteratorWithIndex< TInputImage > it(m_Image,  m_Region);
  m_Minimum = NumericTraits< PixelType >::max();

  while ( !it.IsAtEnd() )
    {
    const PixelType value = it.Get();
    if ( value < m_Minimum )
      {
      m_Minimum = value;
      m_IndexOfMinimum = it.GetIndex();
      }
    ++it;
    }
}

/**
 * Compute the maximum intensity value of the image
 */
template< typename TInputImage >
void
MinimumMaximumImageCalculator< TInputImage >
::ComputeMaximum(void)
{
  if ( !m_RegionSetByUser )
    {
    m_Region = m_Image->GetRequestedRegion();
    }
  ImageRegionConstIteratorWithIndex< TInputImage > it(m_Image,  m_Region);
  m_Maximum = NumericTraits< PixelType >::NonpositiveMin();

  while ( !it.IsAtEnd() )
    {
    const PixelType value = it.Get();
    if ( value > m_Maximum )
      {
      m_Maximum = value;
      m_IndexOfMaximum = it.GetIndex();
      }
    ++it;
    }
}

template< typename TInputImage >
void
MinimumMaximumImageCalculator< TInputImage >
::SetRegion(const RegionType & region)
{
  m_Region = region;
  m_RegionSetByUser = true;
}

template< typename TInputImage >
void
MinimumMaximumImageCalculator< TInputImage >
::PrintSelf(std::ostream & os, Indent indent) const
{
  Superclass::PrintSelf(os, indent);

  os << indent << "Minimum: "
     << static_cast< typename NumericTraits< PixelType >::PrintType >( m_Minimum )
     << std::endl;
  os << indent << "Maximum: "
     << static_cast< typename NumericTraits< PixelType >::PrintType >( m_Maximum )
     << std::endl;
  os << indent << "Index of Minimum: " << m_IndexOfMinimum << std::endl;
  os << indent << "Index of Maximum: " << m_IndexOfMaximum << std::endl;
  itkPrintSelfObjectMacro( Image );
  os << indent << "Region: " << std::endl;
  m_Region.Print( os, indent.GetNextIndent() );
  os << indent << "Region set by User: " << m_RegionSetByUser << std::endl;
}
} // end namespace itk

#endif
