/*
 * 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.
 */

#include "itkMacro.h"

#include "otbDrawPathFilter.h"
#include "otbImageFileWriter.h"
#include "otbImage.h"
#include "itkPolyLineParametricPath.h"

int otbDrawPathFilter(int argc, char* argv[])
{
  if (argc != 5)
  {
    std::cout << "Usgage: " << argv[0] << " sizex sizey nbpoints outfname" << std::endl;
    return EXIT_SUCCESS;
  }
  const unsigned int sizex    = atoi(argv[1]);
  const unsigned int sizey    = atoi(argv[2]);
  const unsigned int nbpoints = atoi(argv[3]);
  const char*        outfname = argv[4];

  const unsigned int    Dimension = 2;
  typedef unsigned char PixelType;
  typedef otb::Image<PixelType, Dimension> ImageType;
  typedef itk::PolyLineParametricPath<Dimension> PathType;
  typedef PathType::VertexType                   VertexType;
  typedef otb::DrawPathFilter<ImageType, PathType, ImageType> DrawPathFilterType;
  typedef otb::ImageFileWriter<ImageType> WriterType;

  ImageType::SizeType size;
  size[0] = sizex;
  size[1] = sizey;
  ImageType::IndexType index;
  index.Fill(0);
  ImageType::RegionType region;
  region.SetSize(size);
  region.SetIndex(index);
  ImageType::Pointer image = ImageType::New();
  image->SetRegions(region);
  image->Allocate();
  image->FillBuffer(0);

  PathType::Pointer path = PathType::New();

  for (unsigned int i = 1; i < nbpoints; ++i)
  {
    VertexType vertex1, vertex2;
    vertex1[0] = 0;
    vertex1[1] = i * sizey / nbpoints;
    vertex2[0] = i * sizex / nbpoints;
    vertex2[1] = 0;
    path->AddVertex(vertex1);
    path->AddVertex(vertex2);
  }
  for (unsigned int i = 1; i < nbpoints; ++i)
  {
    VertexType vertex1, vertex2;
    vertex1[0] = i * sizex / nbpoints;
    vertex1[1] = sizey - 1;
    vertex2[0] = sizex - 1;
    vertex2[1] = i * sizey / nbpoints;
    path->AddVertex(vertex1);
    path->AddVertex(vertex2);
  }

  DrawPathFilterType::Pointer filter = DrawPathFilterType::New();
  filter->SetImageInput(image);
  filter->SetInputPath(path);

  WriterType::Pointer writer = WriterType::New();
  writer->SetInput(filter->GetOutput());
  writer->SetFileName(outfname);
  writer->Update();

  return EXIT_SUCCESS;
}
