/*
 * Copyright (C) 2005-2020 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 otbVectorDataToRandomLineGenerator_hxx
#define otbVectorDataToRandomLineGenerator_hxx

#include "otbVectorDataToRandomLineGenerator.h"

#include "otbMath.h"

namespace otb
{
template <class TVectorData>
VectorDataToRandomLineGenerator<TVectorData>::VectorDataToRandomLineGenerator() : m_NumberOfOutputLine(100), m_MinLineSize(2), m_MaxLineSize(10), m_CurrentID(0)
{
  this->SetNumberOfRequiredInputs(1);
  this->SetNumberOfRequiredOutputs(1);

  m_RandomGenerator     = RandomGeneratorType::GetInstance();
  m_RandomSizeGenerator = RandomGeneratorType::GetInstance();
}

template <class TVectorData>
void VectorDataToRandomLineGenerator<TVectorData>::PrintSelf(std::ostream& os, itk::Indent indent) const
{
  this->Superclass::PrintSelf(os, indent);
  os << indent << "Required Number of Output Line: " << m_NumberOfOutputLine << std::endl;
}

template <class TVectorData>
void VectorDataToRandomLineGenerator<TVectorData>::SetInput(const VectorDataType* vectorData)
{
  this->Superclass::SetNthInput(0, const_cast<VectorDataType*>(vectorData));
}

template <class TVectorData>
const TVectorData* VectorDataToRandomLineGenerator<TVectorData>::GetInput() const
{
  return static_cast<const VectorDataType*>(this->Superclass::GetInput(0));
}

template <class TVectorData>
typename VectorDataToRandomLineGenerator<TVectorData>::PointVectorType VectorDataToRandomLineGenerator<TVectorData>::RandomPointsGenerator(DataNodeType* node)
{
  // Output
  PointVectorType vPoint;

  // Gathering Information
  RegionType                     generatorRegion      = node->GetPolygonExteriorRing()->GetBoundingRegion();
  typename RegionType::SizeType  generatorRegionSize  = generatorRegion.GetSize();
  typename RegionType::IndexType generatorRegionIndex = generatorRegion.GetIndex();
  // typename RegionType::IndexType generatorRegionOrigin = generatorRegion.GetOrigin();

  // Generation
  PointType rangeMin, rangeMax;

  for (unsigned int dim = 0; dim < 2; ++dim)
  {
    rangeMin[dim] = generatorRegionIndex[dim];
    rangeMax[dim] = generatorRegionIndex[dim] + generatorRegionSize[dim];
  }

  unsigned int nbPoint = this->m_RandomSizeGenerator->GetUniformVariate(this->GetMinLineSize(), this->GetMaxLineSize());

  while (nbPoint > 0)
  {
    VertexType candidate;
    for (unsigned int dim = 0; dim < 2; ++dim)
    {
      candidate[dim] = this->m_RandomGenerator->GetUniformVariate(rangeMin[dim], rangeMax[dim]);
    }

    if (node->GetPolygonExteriorRing()->IsInside(candidate))
    {
      PointType point;
      point[0] = candidate[0];
      point[1] = candidate[1];
      vPoint.push_back(point);
      nbPoint--;
    }
  }
  return vPoint;
}

template <class TVectorData>
void VectorDataToRandomLineGenerator<TVectorData>::GenerateData()
{
  this->GetOutput()->SetMetaDataDictionary(this->GetInput()->GetMetaDataDictionary());

  // Retrieving root node
  typename DataNodeType::Pointer root = this->GetOutput()->GetDataTree()->GetRoot()->Get();
  // Create the document node
  typename DataNodeType::Pointer document = DataNodeType::New();
  document->SetNodeType(otb::DOCUMENT);
  // Adding the layer to the data tree
  this->GetOutput(0)->GetDataTree()->Add(document, root);

  // Iterates through the polygon features and generates random Lines inside the polygon
  typename VectorDataType::ConstPointer vectorData = static_cast<const VectorDataType*>(this->GetInput());

  TreeIteratorType itVector(vectorData->GetDataTree());
  itVector.GoToBegin();
  while (!itVector.IsAtEnd())
  {
    if (itVector.Get()->IsPolygonFeature())
    {

      for (unsigned int i = 0; i < this->GetNumberOfOutputLine(); ++i)
      {
        typename DataNodeType::Pointer currentGeometry = DataNodeType::New();
        currentGeometry->SetNodeId(this->GetNextID());
        currentGeometry->SetNodeType(otb::FEATURE_LINE);
        typename LineType::Pointer line = LineType::New();
        currentGeometry->SetLine(line);
        PointVectorType vPoints = RandomPointsGenerator(itVector.Get());
        for (typename PointVectorType::const_iterator it = vPoints.begin(); it != vPoints.end(); ++it)
        {
          VertexType vertex;
          vertex[0] = (*it)[0];
          vertex[1] = (*it)[1];
          currentGeometry->GetLine()->AddVertex(vertex);
        }
        this->GetOutput(0)->GetDataTree()->Add(currentGeometry, document);
      }
    }
    ++itVector;
  }
}

} // end namespace otb

#endif
