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

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

Copyright(c) 2021 John Wellbelove

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
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The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
******************************************************************************/

#include "unit_test_framework.h"

#include "etl/threshold.h"

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

namespace
{
  constexpr size_t Size = 10U;
 
  using IntThreshold        = etl::threshold<int>;
  using IntThresholdGreater = etl::threshold<int, std::greater<int>>;

  using DoubleThreshold        = etl::threshold<double>;
  using DoubleThresholdGreater = etl::threshold<double, std::greater<double>>;

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

  //***********************************
  const std::array<int, Size> input1 = 
  { 
    0, 1, 2, 3, 4, 5, 6, 7, 8, 9
  };

  const std::array<int, Size> result1a = 
  { 
    0, 0, 0, 0, 9, 9, 9, 9, 9, 9
  };

  const std::array<int, Size> result1b = 
  { 
    9, 9, 9, 9, 9, 0, 0, 0, 0, 0
  };

  std::array<int, Size> output1;

  //***********************************
  const std::array<double, Size> input2 = 
  { 
    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, 0.0, 0.0, 0.0, 9.0, 9.0, 9.0, 9.0, 9.0, 9.0
  };

  const std::array<double, Size> result2b = 
  { 
    9.0, 9.0, 9.0, 9.0, 9.0, 0.0, 0.0, 0.0, 0.0, 0.0
  };

  std::array<double, Size> output2;

  SUITE(test_histogram)
  {
    //*************************************************************************
    TEST(test_int_threshold)
    {
      IntThreshold threshold(4, 0, 9);

      std::transform(input1.begin(), input1.end(), output1.begin(), threshold);

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

    //*************************************************************************
    TEST(test_int_threshold_greater)
    {
      IntThresholdGreater threshold(4, 0, 9);

      std::transform(input1.begin(), input1.end(), output1.begin(), threshold);

      bool isEqual = std::equal(output1.begin(), output1.end(), result1b.begin());
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(test_double_threshold)
    {
      DoubleThreshold threshold(4, 0, 9);

      std::transform(input2.begin(), input2.end(), output2.begin(), threshold);

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

    //*************************************************************************
    TEST(test_double_threshold_greater)
    {
      DoubleThresholdGreater threshold(4, 0, 9);

      std::transform(input2.begin(), input2.end(), output2.begin(), threshold);

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