/*
 * 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 otbTileImageFilter_h
#define otbTileImageFilter_h

#include "itkImageToImageFilter.h"

namespace otb
{
/** \class TileImageFilter
 *  \brief This filter allows making a spatial mosaic from a set of images
 *
 *  This filter produces a spatial mosaic from a set of images. It
 *  supports both otb::Image and otb::VectorImage. The layout
 *  parameter allows setting up of the images will be patched together:
 *  it is a 2D array containing the number of images in the horizontal
 *  direction and vertical direction respectively.
 *
 *  Images can be set using the PushBackInput() or SetInput(unsigned
 *  int, Image *) methods. Please note that input images are supposed
 *  to be set in the lexicographical order.
 *
 *  This filter does not support missing images: the number of input
 *  images must match exactly layout[0]*layout[1]. Additional
 *  consistency checks are that the number of components and spacing
 *  must be consistent for all images, and the size of the images must
 *  match with each others.
 *
 * \ingroup Streamed
 * \ingroup MultiThreaded
 *
 * \ingroup OTBImageManipulation
 */
template <class TImage>
class ITK_EXPORT TileImageFilter : public itk::ImageToImageFilter<TImage, TImage>
{
public:
  /** Standard class typedef */
  typedef TileImageFilter Self;
  typedef itk::ImageToImageFilter<TImage, TImage> Superclass;
  typedef itk::SmartPointer<Self>       Pointer;
  typedef itk::SmartPointer<const Self> ConstPointer;

  /** Helper typedefs */
  typedef TImage                         ImageType;
  typedef typename ImageType::Pointer    ImagePointerType;
  typedef typename ImageType::SizeType   SizeType;
  typedef typename ImageType::RegionType RegionType;

  /** Method for creation through the object factory. */
  itkNewMacro(Self);

  /** Run-time type information (and related methods). */
  itkTypeMacro(TileImageFilter, ImageToImageFilter);

  itkSetMacro(Layout, SizeType);
  itkGetConstReferenceMacro(Layout, SizeType);

protected:
  /** Constructor */
  TileImageFilter();

  /** Destructor */
  ~TileImageFilter() override;

  /** PrintSelf method */
  void PrintSelf(std::ostream& os, itk::Indent indent) const override;

  /** Threaded generate data */
  void ThreadedGenerateData(const RegionType& outputRegionForThread, itk::ThreadIdType threadId) override;

  /** Generate input requested region method */
  void GenerateInputRequestedRegion() override;

  /** Generate input requested region method */
  void GenerateOutputInformation() override;

  /** Override VerifyInputInformation() since this filter's inputs do
     * not need to occupy the same physical space.
     *
     * \sa ProcessObject::VerifyInputInformation
     */
  void VerifyInputInformation() override
  {
  }


private:
  TileImageFilter(const Self&) = delete;
  void operator=(const Self&) = delete;

  // Compute the overlapping region between the output requested
  // region and the nth input tile largest region
  RegionType OutputRegionToInputRegion(unsigned int tileIndex, const RegionType& requestedRegion);

  RegionType InputRegionToOutputRegion(unsigned int tileIndex, const RegionType& requestedRegion);

  // Layout of the images
  SizeType m_Layout;

  // Columns sizes
  std::vector<unsigned int> m_ColumnsSizes;

  // Row sizes
  std::vector<unsigned int> m_RowsSizes;
};

} // end namespace itk

#ifndef OTB_MANUAL_INSTANTIATION
#include "otbTileImageFilter.hxx"
#endif

#endif
