/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  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
 *
 *         https://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  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 <iostream>

#include "itkArray2D.h"


int
itkArray2DTest(int, char *[])
{
  using ArrayType = itk::Array2D<double>;

  using VnlMatrixType = vnl_matrix<double>;

  constexpr unsigned int rows{ 3 };
  constexpr unsigned int cols{ 4 };

  ArrayType     a(rows, cols);
  VnlMatrixType vm(rows, cols);

  for (unsigned int r = 0; r < rows; ++r)
  {
    for (unsigned int c = 0; c < cols; ++c)
    {
      const auto value = static_cast<double>(r + c);
      a.SetElement(r, c, value);
      vm(r, c) = value;
    }
  }

  constexpr double tolerance{ 1e-6 };

  // test copy constructor
  ArrayType b(a);

  for (unsigned int r = 0; r < rows; ++r)
  {
    for (unsigned int c = 0; c < cols; ++c)
    {
      double diff = a.GetElement(r, c) - b(r, c);
      diff = (diff > 0.0) ? diff : -diff; // take abs value
      if (diff > tolerance)
      {
        std::cerr << "Error in copy constructor " << std::endl;
        return EXIT_FAILURE;
      }
    }
  }

  // test construction from vnl_matrix
  ArrayType d(vm);

  for (unsigned int r = 0; r < rows; ++r)
  {
    for (unsigned int c = 0; c < cols; ++c)
    {
      double diff = d(r, c) - vm(r, c);
      diff = (diff > 0.0) ? diff : -diff; // take abs value
      if (diff > tolerance)
      {
        std::cerr << "Error in construction from vnl_matrix" << std::endl;
        return EXIT_FAILURE;
      }
    }
  }

  // test for assignment from Array2D

  ArrayType e = a;

  for (unsigned int r = 0; r < rows; ++r)
  {
    for (unsigned int c = 0; c < cols; ++c)
    {
      double diff = a(r, c) - e(r, c);
      diff = (diff > 0.0) ? diff : -diff; // take abs value
      if (diff > tolerance)
      {
        std::cerr << "Error in assignment from Array2D constructor " << std::endl;
        return EXIT_FAILURE;
      }
    }
  }

  // test for assignment from vnl_matrix

  ArrayType f = vm;

  for (unsigned int r = 0; r < rows; ++r)
  {
    for (unsigned int c = 0; c < cols; ++c)
    {
      double diff = f(r, c) - vm(r, c);
      diff = (diff > 0.0) ? diff : -diff; // take abs value
      if (diff > tolerance)
      {
        std::cerr << "Error in assignment from  vn_matrix" << std::endl;
        return EXIT_FAILURE;
      }
    }
  }

  std::cout << "Test Passed ! " << std::endl;
  return EXIT_SUCCESS;
}
