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/*
 * Copyright (C) 2005-2017 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_txx
#define otbTileMapTransform_txx

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

namespace otb
{

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

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

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

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

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

} // namespace otb

#endif