/*
 * Copyright (C) 2005-2022 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 otbTileMapTransform_hxx
#define otbTileMapTransform_hxx

#include "otbTileMapTransform.h"
#include "otbMacro.h"
#include "otbMath.h"

namespace otb
{

template <TransformDirection TTransformDirection, class TScalarType, unsigned int NInputDimensions, unsigned int NOutputDimensions>
TileMapTransform<TTransformDirection, TScalarType, NInputDimensions, NOutputDimensions>::TileMapTransform() : Superclass(ParametersDimension), m_Depth(0)
{
}

template <TransformDirection TTransformDirection, class TScalarType, unsigned int NInputDimensions, unsigned int NOutputDimensions>
TileMapTransform<TTransformDirection, TScalarType, NInputDimensions, NOutputDimensions>::~TileMapTransform()
{
}

template <TransformDirection TTransformDirection, class TScalarType, unsigned int NInputDimensions, unsigned int NOutputDimensions>
typename TileMapTransform<TTransformDirection, TScalarType, NInputDimensions, NOutputDimensions>::OutputPointType
TileMapTransform<TTransformDirection, TScalarType, NInputDimensions, NOutputDimensions>::TransformPoint(const InputPointType& point) const
{
  OutputPointType outputPoint;

  if (DirectionOfMapping == TransformDirection::INVERSE)
  {
    outputPoint[0] = static_cast<double>(point[0]) / (1 << m_Depth) / 256 * 360.0 - 180.0;
    double y       = static_cast<double>(point[1]) / (1 << m_Depth) / 256;
    double ex      = exp(4 * CONST_PI * (y - 0.5));
    outputPoint[1] = -180.0 / CONST_PI * asin((ex - 1) / (ex + 1));
  }

  if (DirectionOfMapping == TransformDirection::FORWARD)
  {
    double x = (180.0 + point[0]) / 360.0;
    double y = -point[1] * CONST_PI / 180; // convert to radians
    y        = 0.5 * log((1 + sin(y)) / (1 - sin(y)));
    y *= 1.0 / (2 * CONST_PI); // scale factor from radians to normalized
    y += 0.5;                  // and make y range from 0 - 1

    outputPoint[0] = floor(x * pow(2., static_cast<double>(m_Depth)) * 256);
    outputPoint[1] = floor(y * pow(2., static_cast<double>(m_Depth)) * 256);
  }
  return outputPoint;
}

template <TransformDirection TTransformDirection, class TScalarType, unsigned int NInputDimensions, unsigned int NOutputDimensions>
void TileMapTransform<TTransformDirection, TScalarType, NInputDimensions, NOutputDimensions>::PrintMap() const
{
}

template <TransformDirection TTransformDirection, class TScalarType, unsigned int NInputDimensions, unsigned int NOutputDimensions>
void TileMapTransform<TTransformDirection, TScalarType, NInputDimensions, NOutputDimensions>::SetLevel(unsigned int level)
{
  this->SetDepth(level);
}

template <TransformDirection TTransformDirection, class TScalarType, unsigned int NInputDimensions, unsigned int NOutputDimensions>
unsigned int TileMapTransform<TTransformDirection, TScalarType, NInputDimensions, NOutputDimensions>::GetLevel() const
{
  return this->GetDepth();
}

} // namespace otb

#endif
