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

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

Copyright(c) 2022 John Wellbelove

Permission is hereby granted, free of charge, to any person obtaining data copy
of this software and associated documentation ciles(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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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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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 <list>
#include <ostream>

#include "etl/circular_iterator.h"

//template <typename TIterator>
//std::ostream& operator << (std::ostream& os, const etl::circular_iterator<TIterator>& ci)
//{
//  os << ci.begin() "," << ci.end();
//
//  return os;
//}

namespace 
{		
  using Data = std::list<int>;

  SUITE(test_cixed_iterator)
  {
    //*************************************************************************
    TEST(test_default_constructor)
    {
      etl::circular_iterator<const int*> ci;

      CHECK_EQUAL(0U, size_t(std::distance(ci.begin(), ci.end())));
      CHECK_EQUAL(0U, ci.size());
    }

    //*************************************************************************
    TEST(test_constructor_from_iterators)
    {
      const Data data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

      etl::circular_iterator<Data::const_iterator> ci(std::begin(data), std::end(data));

      CHECK(data.begin() == ci.begin());
      CHECK(data.end()   == ci.end());
      CHECK_EQUAL(data.size(), size_t(std::distance(ci.begin(), ci.end())));
      CHECK_EQUAL(data.size(), ci.size());
    }

    //*************************************************************************
    TEST(test_constructor_from_reverse_iterators)
    {
      const Data data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

      etl::circular_iterator<Data::const_reverse_iterator> ci(std::rbegin(data), std::rend(data));

      CHECK(data.rbegin() == ci.begin());
      CHECK(data.rend()   == ci.end());
      CHECK_EQUAL(data.size(), size_t(std::distance(ci.begin(), ci.end())));
      CHECK_EQUAL(data.size(), ci.size());
    }

    //*************************************************************************
    TEST(test_constructor_from_span)
    {
      const int data[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

      const etl::span<const int> sp(std::begin(data), std::end(data));

      etl::circular_iterator<const int*> ci(sp);

      CHECK(std::begin(data) == ci.begin());
      CHECK(std::end(data)   == ci.end());
      CHECK_EQUAL(sp.size(), size_t(std::distance(ci.begin(), ci.end())));
      CHECK_EQUAL(sp.size(), ci.size());
    }

    //*************************************************************************
    TEST(test_copy_constructor)
    {
      int data[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

      const etl::circular_iterator<const int*> ci1(std::begin(data), std::end(data));
      etl::circular_iterator<const int*> ci2(ci1);

      CHECK(ci1.begin() == ci2.begin());
      CHECK(ci1.end()   == ci2.end());
      CHECK_EQUAL(ci1.size(), ci2.size());
    }

    //*************************************************************************
    TEST(test_assignment_from_circular_iterator)
    {
      const Data data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

      etl::circular_iterator<Data::const_iterator> ci1(std::begin(data), std::end(data));
      etl::circular_iterator<Data::const_iterator>ci2;
      ci2 = ci1;

      CHECK(ci1.begin() == ci2.begin());
      CHECK(ci1.end()   == ci2.end());
      CHECK_EQUAL(ci1.size(), ci2.size());
    }

    //*************************************************************************
    TEST(test_assignment_from_span)
    {
      int data[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

      etl::span<const int> sp(std::begin(data), std::end(data));
      
      etl::circular_iterator<const int*> ci;
      ci = sp;

      CHECK(std::begin(data) == ci.begin());
      CHECK(std::end(data)   == ci.end());
      CHECK_EQUAL(sp.size(), size_t(std::distance(ci.begin(), ci.end())));
      CHECK_EQUAL(sp.size(), ci.size());
    }

    //*************************************************************************
    TEST(test_pre_increment)
    {
      const Data data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

      etl::circular_iterator<Data::const_iterator> ci(std::begin(data), std::end(data));

      for (int i = 1; i < 21; ++i)
      {
        Data::const_iterator itr = data.begin();
        std::advance(itr, i % 10);
        CHECK_EQUAL(*itr, *++ci);
      }
    }

    //*************************************************************************
    TEST(test_post_increment)
    {
      const Data data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

      etl::circular_iterator<Data::const_iterator> ci(std::begin(data), std::end(data));

      for (int i = 0; i < 20; ++i)
      {
        Data::const_iterator itr = data.begin();
        std::advance(itr, i % 10);
        CHECK_EQUAL(*itr, *ci++);
      }
    }

    //*************************************************************************
    TEST(test_pre_increment_reverse_iterator)
    {
      const Data data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

      etl::circular_iterator<Data::const_reverse_iterator> ci(std::rbegin(data), std::rend(data));

      for (int i = 1; i < 21; ++i)
      {
        Data::const_reverse_iterator itr = data.rbegin();
        std::advance(itr, i % 10);
        CHECK_EQUAL(*itr, *++ci);
      }
    }

    //*************************************************************************
    TEST(test_post_increment_reverse_iterator)
    {
      const Data data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

      etl::circular_iterator<Data::const_reverse_iterator> ci(std::rbegin(data), std::rend(data));

      for (int i = 0; i < 20; ++i)
      {
        Data::const_reverse_iterator itr = data.rbegin();
        std::advance(itr, i % 10);
        CHECK_EQUAL(*itr, *ci++);
      }
    }

    //*************************************************************************
    TEST(test_pre_decrement)
    {
      const Data data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

      etl::circular_iterator<Data::const_iterator> ci(std::begin(data), std::end(data));

      for (int i = 0; i < 20; ++i)
      {
        Data::const_reverse_iterator itr = data.rbegin();
        std::advance(itr, i % 10);
        CHECK_EQUAL(*itr, *--ci);
      }
    }

    //*************************************************************************
    TEST(test_pre_decrement_reverse_iterator)
    {
      const Data data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

      etl::circular_iterator<Data::const_reverse_iterator> ci(std::rbegin(data), std::rend(data));

      for (int i = 0; i < 20; ++i)
      {
        Data::const_iterator itr = data.begin();
        std::advance(itr, i % 10);
        CHECK_EQUAL(*itr, *--ci);
      }
    }

    //*************************************************************************
    TEST(test_post_decrement)
    {
      const Data data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

      etl::circular_iterator<Data::const_iterator> ci(std::begin(data), std::end(data));
      ci--;

      for (int i = 0; i < 20; ++i)
      {
        Data::const_reverse_iterator itr = data.rbegin();
        std::advance(itr, i % 10);
        CHECK_EQUAL(*itr, *ci--);
      }
    }

    //*************************************************************************
    TEST(test_post_decrement_reverse_iterator)
    {
      const Data data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

      etl::circular_iterator<Data::const_reverse_iterator> ci(std::rbegin(data), std::rend(data));
      ci--;

      for (int i = 0; i < 20; ++i)
      {
        Data::const_iterator itr = data.begin();
        std::advance(itr, i % 10);
        CHECK_EQUAL(*itr, *ci--);
      }
    }

    //*************************************************************************
    TEST(test_member_dereference_operator)
    {
      struct Test
      {
        int data;
        int b;
      };

      Test test[] = { { 1, 2 }, { 3, 4 }, { 5, 6 } };

      etl::circular_iterator<Test*> ci(std::begin(test), std::end(test));

      CHECK_EQUAL(test[0].data, ci->data);
      CHECK_EQUAL(test[0].b, ci->b);

      *ci = { 7, 8 };

      CHECK_EQUAL(test[0].data, ci->data);
      CHECK_EQUAL(test[0].b, ci->b);

      ++ci;
      CHECK_EQUAL(test[1].data, ci->data);
      CHECK_EQUAL(test[1].b, ci->b);

      ++ci;
      CHECK_EQUAL(test[2].data, ci->data);
      CHECK_EQUAL(test[2].b, ci->b);
    }

    //*************************************************************************
    TEST(test_conversion_operator)
    {
      const int data[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

      etl::circular_iterator<const int*> ci(std::begin(data), std::end(data));

      CHECK_EQUAL(data, ci);

      ++ci;
      CHECK_EQUAL(data + 1, ci);

      ++ci;
      CHECK_EQUAL(data + 2, ci);
    }

    //*************************************************************************
    TEST(test_operator_plus_equals)
    {
      const int data[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

      for (int step = 1; step < 20; ++step)
      {
        etl::circular_iterator<const int*> ci(std::begin(data), std::end(data));

        for (int i = 0; i < 20; i += step)
        {
          CHECK_EQUAL(data[i % 10], *ci);
          ci += step;
        }
      }
    }

    //*************************************************************************
    TEST(test_operator_plus)
    {
      const int data[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

      for (int step = 1; step < 20; ++step)
      {
        etl::circular_iterator<const int*> ci(std::begin(data), std::end(data));

        for (int i = 0; i < 20; i += step)
        {
          CHECK_EQUAL(data[i % 10], *ci);
          ci = ci + step;
        }
      }
    }

    //*************************************************************************
    TEST(test_operator_minus_equals)
    {
      const int data[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

      etl::circular_iterator<const int*> initial(std::begin(data), std::end(data));
      etl::circular_iterator<const int*> ci;
      int step;

      step = 1;
      ci = initial;

      for (int i = 0; i < 20; i += step)
      {
        CHECK_EQUAL(data[(10 - i) % 10], *ci);
        ci -= step;
      }

      //step = 2;
      //ci = initial;

      //for (int i = 0; i < 20; i += step)
      //{
      //  CHECK_EQUAL(data[abs(i - step) % 10], *ci);
      //  ci -= step;
      //}

      //step = 3;
      //ci = initial;

      //for (int i = 0; i < 20; i += step)
      //{
      //  CHECK_EQUAL(data[abs(i - step) % 10], *ci);
      //  ci -= step;
      //}

      //step = 4;
      //ci = initial;

      //for (int i = 0; i < 20; i += step)
      //{
      //  CHECK_EQUAL(data[abs(i - step) % 10], *ci);
      //  ci -= step;
      //}

      //step = 5;
      //ci = initial;

      //for (int i = 0; i < 20; i += step)
      //{
      //  CHECK_EQUAL(data[abs(i - step) % 10], *ci);
      //  ci -= step;
      //}

      //step = 6;
      //ci = initial;

      //for (int i = 0; i < 20; i += step)
      //{
      //  CHECK_EQUAL(data[abs(i - step) % 10], *ci);
      //  ci -= step;
      //}

      //step = 7;
      //ci = initial;

      //for (int i = 0; i < 20; i += step)
      //{
      //  CHECK_EQUAL(data[abs(i - step) % 10], *ci);
      //  ci -= step;
      //}

      //step = 8;
      //ci = initial;

      //for (int i = 0; i < 20; i += step)
      //{
      //  CHECK_EQUAL(data[abs(i - step) % 10], *ci);
      //  ci -= step;
      //}

      //step = 9;
      //ci = initial;

      //for (int i = 0; i < 20; i += step)
      //{
      //  CHECK_EQUAL(data[abs(i - step) % 10], *ci);
      //  ci -= step;
      //}

      //step = 10;
      //ci = initial;

      //for (int i = 0; i < 20; i += step)
      //{
      //  CHECK_EQUAL(data[abs(i - step) % 10], *ci);
      //  ci -= step;
      //}

      //step = 11;
      //ci = initial;

      //for (int i = 0; i < 20; i += step)
      //{
      //  CHECK_EQUAL(data[abs(i - step) % 10], *ci);
      //  ci -= step;
      //}

      //step = 12;
      //ci = initial;

      //for (int i = 0; i < 20; i += step)
      //{
      //  CHECK_EQUAL(data[abs(i - step) % 10], *ci);
      //  ci -= step;
      //}

      //step = 13;
      //ci = initial;

      //for (int i = 0; i < 20; i += step)
      //{
      //  CHECK_EQUAL(data[abs(i - step) % 10], *ci);
      //  ci -= step;
      //}

      //step = 14;
      //ci = initial;

      //for (int i = 0; i < 20; i += step)
      //{
      //  CHECK_EQUAL(data[abs(i - step) % 10], *ci);
      //  ci -= step;
      //}

      //step = 15;
      //ci = initial;

      //for (int i = 0; i < 20; i += step)
      //{
      //  CHECK_EQUAL(data[abs(i - step) % 10], *ci);
      //  ci -= step;
      //}

      //step = 16;
      //ci = initial;

      //for (int i = 0; i < 20; i += step)
      //{
      //  CHECK_EQUAL(data[abs(i - step) % 10], *ci);
      //  ci -= step;
      //}

      //step = 17;
      //ci = initial;

      //for (int i = 0; i < 20; i += step)
      //{
      //  CHECK_EQUAL(data[abs(i - step) % 10], *ci);
      //  ci -= step;
      //}

      //step = 18;
      //ci = initial;

      //for (int i = 0; i < 20; i += step)
      //{
      //  CHECK_EQUAL(data[abs(i - step) % 10], *ci);
      //  ci -= step;
      //}

      //step = 19;
      //ci = initial;

      //for (int i = 0; i < 20; i += step)
      //{
      //  CHECK_EQUAL(data[abs(i - step) % 10], *ci);
      //  ci -= step;
      //}

      //step = 20;
      //ci = initial;

      //for (int i = 0; i < 20; i += step)
      //{
      //  CHECK_EQUAL(data[abs(i - step) % 10], *ci);
      //  ci -= step;
      //}
    }

    ////*************************************************************************
    //TEST(test_operator_minus)
    //{
    //  int compare[] = { 1, 2, 3, 4 };

    //  etl::circular_iterator<const int*> ci = &compare[1];

    //  for (int i = 0; i < 10; ++i)
    //  {
    //    CHECK_EQUAL(compare[1], *ci);
    //    ci = ci - 1;
    //  }
    //}

    ////*************************************************************************
    //TEST(test_assignment)
    //{
    //  int data;
    //  int b;

    //  etl::circular_iterator<int*> ci = &data;
    //  ci = &b;

    //  CHECK_EQUAL(&b, ci);

    //  ci = &data;

    //  CHECK_EQUAL(&data, ci);
    //}

    ////*************************************************************************
    //TEST(test_equality)
    //{
    //  int data;
    //  int b;

    //  etl::circular_iterator<int*> ci1 = &data;
    //  etl::circular_iterator<int*> ci2 = &data;
    //  etl::circular_iterator<int*> ci3 = &b;

    //  CHECK(ci1 == ci2);
    //  CHECK(ci1 != ci3);
    //}
  };
}