/******************************************************************************
The MIT License(MIT)

Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com

Copyright(c) 2021 John Wellbelove

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The above copyright notice and this permission notice shall be included in all
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SOFTWARE.
******************************************************************************/

#include "unit_test_framework.h"

#include "etl/gamma.h"

#include <array>
#include <algorithm>
#include <math.h>

namespace
{
  constexpr size_t Size = 10UL;

  using IntGammaEncode    = etl::gamma_encode<int>;
  using DoubleGammaEncode = etl::gamma_encode<double>;

  using DoubleGammaDecode = etl::gamma_decode<double>;

  struct Compare
  {
    bool operator ()(double lhs, double rhs) const
    {
      return fabs(lhs - rhs) < 0.1;
    }
  };

  //***********************************
  const std::array<int, Size> input1a =
  {
    0, 1, 2, 3, 4, 5, 6, 7, 8, 9
  };

  const std::array<int, Size> result1a =
  {
    0, 0, 0, 1, 1, 2, 4, 5, 7, 9
  };

  std::array<int, Size> output1;

  //***********************************
  const std::array<double, Size> input2a =
  {
    0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0
  };

  const std::array<double, Size> result2a =
  {
    0.0, 0.11, 0.44, 1.00, 1.78, 2.78, 4.00, 5.44, 7.11, 9.00
  };

  const std::array<double, Size> input2b =
  {
    0.0, 0.11, 0.44, 1.00, 1.78, 2.78, 4.00, 5.44, 7.11, 9.00
  };

  const std::array<double, Size> result2b =
  {
    0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0
  };

  std::array<double, Size> output2;

  SUITE(test_gamma)
  {
    //*************************************************************************
    TEST(test_int_gamma_encode)
    {
      IntGammaEncode gamma(0.5, 9);

      std::transform(input1a.begin(), input1a.end(), output1.begin(), gamma);

      bool isEqual = std::equal(output1.begin(), output1.end(), result1a.begin());
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(test_double_gamma_encode)
    {
      DoubleGammaEncode gamma(0.5, 9.0);

      std::transform(input2a.begin(), input2a.end(), output2.begin(), gamma);

      bool isEqual = std::equal(output2.begin(), output2.end(), result2a.begin(), Compare());
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(test_double_gamma_decode)
    {
      DoubleGammaDecode gamma(0.5, 9.0);

      std::transform(input2b.begin(), input2b.end(), output2.begin(), gamma);

      bool isEqual = std::equal(output2.begin(), output2.end(), result2b.begin(), Compare());
      CHECK(isEqual);
    }
  };
}