/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  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
 *
 *         https://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 itkRGBPixel_hxx
#define itkRGBPixel_hxx
#include "itkNumericTraits.h"
#include "itkMath.h"
#include <algorithm>

namespace itk
{
template <typename T>
RGBPixel<T> &
RGBPixel<T>::operator=(const ComponentType r[3])
{
  BaseArray::operator=(r);
  return *this;
}

template <typename T>
RGBPixel<T>
RGBPixel<T>::operator+(const Self & r) const
{
  Self result;

  for (unsigned int i = 0; i < 3; ++i)
  {
    result[i] = (*this)[i] + r[i];
  }
  return result;
}

template <typename T>
RGBPixel<T>
RGBPixel<T>::operator-(const Self & r) const
{
  Self result;

  for (unsigned int i = 0; i < 3; ++i)
  {
    result[i] = (*this)[i] - r[i];
  }
  return result;
}

template <typename T>
const RGBPixel<T> &
RGBPixel<T>::operator+=(const Self & r)
{
  for (unsigned int i = 0; i < 3; ++i)
  {
    (*this)[i] += r[i];
  }
  return *this;
}

template <typename T>
const RGBPixel<T> &
RGBPixel<T>::operator-=(const Self & r)
{
  for (unsigned int i = 0; i < 3; ++i)
  {
    (*this)[i] -= r[i];
  }
  return *this;
}

template <typename T>
const RGBPixel<T> &
RGBPixel<T>::operator*=(const ComponentType & r)
{
  for (unsigned int i = 0; i < 3; ++i)
  {
    (*this)[i] *= r;
  }
  return *this;
}


template <typename T>
const RGBPixel<T> &
RGBPixel<T>::operator/=(const ComponentType & r)
{
  for (unsigned int i = 0; i < 3; ++i)
  {
    (*this)[i] /= r;
  }
  return *this;
}

template <typename T>
RGBPixel<T>
RGBPixel<T>::operator*(const ComponentType & r) const
{
  Self result;

  for (unsigned int i = 0; i < 3; ++i)
  {
    result[i] = (*this)[i] * r;
  }
  return result;
}

template <typename T>
RGBPixel<T>
RGBPixel<T>::operator/(const ComponentType & r) const
{
  Self result;

  for (unsigned int i = 0; i < 3; ++i)
  {
    result[i] = (*this)[i] / r;
  }
  return result;
}

template <typename T>
bool
RGBPixel<T>::operator==(const Self & r) const
{
  return this->BaseArray::operator==(r);
}

template <typename T>
bool
RGBPixel<T>::operator<(const Self & r) const
{
  return std::lexicographical_compare(this->cbegin(), this->cend(), r.cbegin(), r.cend());
}

template <typename T>
auto
RGBPixel<T>::GetLuminance() const -> LuminanceType
{
  const LuminanceType luminance = 0.30 * static_cast<LuminanceType>(this->GetRed()) +
                                  0.59 * static_cast<LuminanceType>(this->GetGreen()) +
                                  0.11 * static_cast<LuminanceType>(this->GetBlue());

  return luminance;
}

template <typename TComponent>
std::ostream &
operator<<(std::ostream & os, const RGBPixel<TComponent> & c)
{
  os << static_cast<typename NumericTraits<TComponent>::PrintType>(c[0]) << "  ";
  os << static_cast<typename NumericTraits<TComponent>::PrintType>(c[1]) << "  ";
  os << static_cast<typename NumericTraits<TComponent>::PrintType>(c[2]);
  return os;
}

template <typename TComponent>
std::istream &
operator>>(std::istream & is, RGBPixel<TComponent> & c)
{
  TComponent red;
  TComponent green;
  TComponent blue;

  is >> red >> green >> blue;
  c.SetRed(red);
  c.SetGreen(green);
  c.SetBlue(blue);
  return is;
}
} // end namespace itk

#endif
