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

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

Copyright(c) 2018 jwellbelove

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
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The above copyright notice and this permission notice shall be included in all
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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 "UnitTest++.h"

#undef min
#undef max

#include "etl/stl/alternate/algorithm.h"

#include <algorithm>
#include <vector>
#include <list>

namespace
{
  int dataEQ[10] = { 1, 1, 3, 3, 5, 5, 7, 7, 9, 9 };
  std::list<int> dataEQL = { 1, 1, 3, 3, 5, 5, 7, 7, 9, 9 };

  int dataS[10] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
  std::list<int> dataSL = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };

  int dataA[10] = { 2, 1, 4, 3, 6, 5, 8, 7, 10, 9 };

  typedef std::vector<int> Vector;
  Vector dataV = { 2, 1, 4, 3, 6, 5, 8, 7, 10, 9 };

  typedef std::list<int> List;
  List dataL = { 2, 1, 4, 3, 6, 5, 8, 7, 10, 9 };

  class Data
  {
  public:

    Data()
      : a(0),
        b(0)
    {
    }

    Data(int a, int b)
      : a(a),
        b(b)
    {
    }

    int a;
    int b;
  };

  Data dataD[10] = { Data(1, 2), Data(2, 1), Data(3, 4), Data(4, 3), Data(5, 6), Data(6, 5), Data(7, 8), Data(8, 7), Data(9, 10), Data(10, 9) };

  bool operator ==(const Data& lhs, const Data& rhs)
  {
    return (lhs.a == rhs.a) && (lhs.b == rhs.b);
  }

  struct StructDataPredicate
  {
    bool operator ()(const Data& lhs, const Data& rhs) const
    {
      return lhs.a < rhs.a;
    }
  };

  struct StructDataEquality
  {
    bool operator ()(const Data& lhs, const Data& rhs) const
    {
      return lhs.a == rhs.a;
    }
  };

  std::ostream& operator << (std::ostream& os, const Data& data_)
  {
    os << data_.a << "," << data_.b;
    return os;
  }

  struct Greater : public std::binary_function<int, int, bool>
  {
    bool operator()(int a, int b) const
    {
      return a > b;
    }
  };

  SUITE(test_no_stl_algorithm)
  {
    //*************************************************************************
    TEST(distance_non_random)
    {
      ptrdiff_t d1 = std::distance(dataL.begin(), dataL.end());
      ptrdiff_t d2 = etlstd::distance(dataL.begin(), dataL.end());

      CHECK_EQUAL(d1, d2);
    }

    //*************************************************************************
    TEST(distance_random)
    {
      ptrdiff_t d1 = std::distance(dataV.begin(), dataV.end());
      ptrdiff_t d2 = etlstd::distance(dataV.begin(), dataV.end());

      CHECK_EQUAL(d1, d2);
    }

    //*************************************************************************
    TEST(advance_non_random)
    {
      List::const_iterator itr1 = dataL.begin();
      List::const_iterator itr2 = dataL.begin();
      
      std::advance(itr1, 4);
      std::advance(itr2, 4);

      CHECK_EQUAL(*itr1, *itr2);
    }

    //*************************************************************************
    TEST(advance_random)
    {
      Vector::const_iterator itr1 = dataV.begin();
      Vector::const_iterator itr2 = dataV.begin();

      std::advance(itr1, 4);
      std::advance(itr2, 4);

      CHECK_EQUAL(*itr1, *itr2);
    }

    //*************************************************************************
    TEST(min)
    {
      int a = 1;
      int b = 2;

      CHECK_EQUAL((std::min(a, b)), (etlstd::min(a, b)));
      CHECK_EQUAL((std::min(b, a)), (etlstd::min(b, a)));
    }

    //*************************************************************************
    TEST(min_compare)
    {
      int a = 1;
      int b = 2;

      CHECK_EQUAL((std::min(a, b, Greater())), (etlstd::min(a, b, Greater())));
      CHECK_EQUAL((std::min(b, a, Greater())), (etlstd::min(b, a, Greater())));
    }

    //*************************************************************************
    TEST(max)
    {
      int a = 1;
      int b = 2;

      CHECK_EQUAL((std::max(a, b)), (etlstd::max(a, b)));
      CHECK_EQUAL((std::max(b, a)), (etlstd::max(b, a)));
    }

    //*************************************************************************
    TEST(max_compare)
    {
      int a = 1;
      int b = 2;

      CHECK_EQUAL((std::max(a, b, Greater())), (etlstd::max(a, b, Greater())));
      CHECK_EQUAL((std::max(b, a, Greater())), (etlstd::max(b, a, Greater())));
    }

    //*************************************************************************
    TEST(copy_pod_pointer)
    {
      int data1[10];
      int data2[10];

      std::copy(std::begin(dataA), std::end(dataA), std::begin(data1));
      etlstd::copy(std::begin(dataA), std::end(dataA), std::begin(data2));

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(copy_non_pod_pointer)
    {
      Data data1[10];
      Data data2[10];

      std::copy(std::begin(dataD), std::end(dataD), std::begin(data1));
      etlstd::copy(std::begin(dataD), std::end(dataD), std::begin(data2));

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(copy_non_random_iterator)
    {
      List data1(dataL.size());
      List data2(dataL.size());

      std::copy(std::begin(dataA), std::end(dataA), std::begin(data1));
      etlstd::copy(std::begin(dataA), std::end(dataA), std::begin(data2));

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(copy_n_pod_pointer)
    {
      int data1[10];
      int data2[10];

      std::copy_n(std::begin(dataA), 10, std::begin(data1));
      etlstd::copy_n(std::begin(dataA), 10, std::begin(data2));

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(copy_n_non_pod_pointer)
    {
      Data data1[10];
      Data data2[10];

      std::copy_n(std::begin(dataD), 10, std::begin(data1));
      etlstd::copy_n(std::begin(dataD), 10, std::begin(data2));

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(copy_n_non_random_iterator)
    {
      List data1(dataL.size());
      List data2(dataL.size());

      std::copy_n(std::begin(dataA), 10, std::begin(data1));
      etlstd::copy_n(std::begin(dataA), 10, std::begin(data2));

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(copy_backward_pod_pointer)
    {
      int data1[10];
      int data2[10];

      std::copy_backward(std::begin(dataA), std::end(dataA), std::end(data1));
      etlstd::copy_backward(std::begin(dataA), std::end(dataA), std::end(data2));

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(copy_backward_non_pod_pointer)
    {
      Data data1[10];
      Data data2[10];

      std::copy_backward(std::begin(dataD), std::end(dataD), std::end(data1));
      etlstd::copy_backward(std::begin(dataD), std::end(dataD), std::end(data2));

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(copy_backward_non_random_iterator)
    {
      List data1(dataL.size());
      List data2(dataL.size());

      std::copy_backward(std::begin(dataA), std::end(dataA), std::end(data1));
      etlstd::copy_backward(std::begin(dataA), std::end(dataA), std::end(data2));

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(lower_bound_random_iterator)
    {
      for (int i = 0; i < 11; ++i)
      {
        int* lb1 = std::lower_bound(std::begin(dataS), std::end(dataS), i);
        int* lb2 = etlstd::lower_bound(std::begin(dataS), std::end(dataS), i);

        CHECK_EQUAL(lb1, lb2);
      }
    }

    //*************************************************************************
    TEST(lower_bound_non_random_iterator)
    {
      for (int i = 0; i < 11; ++i)
      {
        std::list<int>::iterator lb1 = std::lower_bound(std::begin(dataSL), std::end(dataSL), i);
        std::list<int>::iterator lb2 = etlstd::lower_bound(std::begin(dataSL), std::end(dataSL), i);

        CHECK_EQUAL(std::distance(std::begin(dataSL), lb1), std::distance(std::begin(dataSL), lb2));
      }
    }

    //*************************************************************************
    TEST(upper_bound_random_iterator)
    {
      for (int i = 0; i < 11; ++i)
      {
        int* lb1 = std::upper_bound(std::begin(dataS), std::end(dataS), i);
        int* lb2 = etlstd::upper_bound(std::begin(dataS), std::end(dataS), i);

        CHECK_EQUAL(std::distance(std::begin(dataS), lb1), std::distance(std::begin(dataS), lb2));
      }
    }

    //*************************************************************************
    TEST(upper_bound_non_random_iterator)
    {
      for (int i = 0; i < 11; ++i)
      {
        std::list<int>::iterator lb1 = std::upper_bound(std::begin(dataSL), std::end(dataSL), i);
        std::list<int>::iterator lb2 = etlstd::upper_bound(std::begin(dataSL), std::end(dataSL), i);

        CHECK_EQUAL(std::distance(std::begin(dataSL), lb1), std::distance(std::begin(dataSL), lb2));
      }
    }

    //*************************************************************************
    TEST(equal_range_random_iterator)
    {
      for (int i = 0; i < 11; ++i)
      {
        std::pair<int*, int*> lb1 = std::equal_range(std::begin(dataEQ), std::end(dataEQ), i);
        std::pair<int*, int*> lb2 = etlstd::equal_range(std::begin(dataEQ), std::end(dataEQ), i);

        CHECK_EQUAL(std::distance(std::begin(dataEQ), lb1.first), std::distance(std::begin(dataEQ), lb2.first));
        CHECK_EQUAL(std::distance(lb1.first, lb1.second), std::distance(lb2.first, lb2.second));
      }
    }

    //*************************************************************************
    TEST(equal_range_non_random_iterator)
    {
      for (int i = 0; i < 11; ++i)
      {
        std::pair<std::list<int>::iterator, std::list<int>::iterator> lb1 = std::equal_range(std::begin(dataEQL), std::end(dataEQL), i);
        std::pair<std::list<int>::iterator, std::list<int>::iterator> lb2 = etlstd::equal_range(std::begin(dataEQL), std::end(dataEQL), i);

        CHECK_EQUAL(std::distance(std::begin(dataEQL), lb1.first), std::distance(std::begin(dataEQL), lb2.first));
        CHECK_EQUAL(std::distance(lb1.first, lb1.second), std::distance(lb2.first, lb2.second));
      }
    }

    //*************************************************************************
    TEST(fill_non_char)
    {
      int data1[10];
      int data2[10];

      std::fill(std::begin(data1), std::end(data1), 0x12345678);
      etlstd::fill(std::begin(data2), std::end(data2), 0x12345678);

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(fill_char)
    {
      unsigned char data1[10];
      unsigned char data2[10];

      std::fill(std::begin(data1), std::end(data1), char(0x12));
      etlstd::fill(std::begin(data2), std::end(data2), char(0x12));

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(swap)
    {
      int a = 1;
      int b = 2;

      etlstd::swap(a, b);
      CHECK_EQUAL(2, a); 
      CHECK_EQUAL(1, b);
    }

    //*************************************************************************
    TEST(iter_swap)
    {
      int a = 1;
      int b = 2;

      etlstd::iter_swap(&a, &b);
      CHECK_EQUAL(2, a);
      CHECK_EQUAL(1, b);
    }

    //*************************************************************************
    TEST(equal)
    {
      CHECK(etlstd::equal(std::begin(dataV), std::end(dataV), std::begin(dataL)));
      CHECK(!etlstd::equal(std::begin(dataSL), std::end(dataSL), std::begin(dataL)));
    }

    //*************************************************************************
    TEST(lexicographical_compare)
    {
      std::string text1("Hello World");
      std::string text2("Hello Xorld");

      bool t1 = std::lexicographical_compare(text1.begin(), text1.end(), text2.begin(), text2.begin() + 7);
      bool t2 = etlstd::lexicographical_compare(text1.begin(), text1.end(), text2.begin(), text2.begin() + 7);

      CHECK(t1 == t2);
    }

    //*************************************************************************
    TEST(lexicographical_compare_greater)
    {
      std::string text1("Hello World");
      std::string text2("Hello Xorld");

      bool t1 = std::lexicographical_compare(text1.begin(), text1.end(), text2.begin(), text2.begin() + 7, Greater());
      bool t2 = etlstd::lexicographical_compare(text1.begin(), text1.end(), text2.begin(), text2.begin() + 7, Greater());

      CHECK(t1 == t2);
    }

    //*************************************************************************
    TEST(search)
    {
      std::string haystack = "ABCDFEGHIJKLMNOPQRSTUVWXYZ";
      std::string needle   = "KLMNO";

      std::string::iterator itr1 = std::search(haystack.begin(), haystack.end(), needle.begin(), needle.begin());
      std::string::iterator itr2 = etlstd::search(haystack.begin(), haystack.end(), needle.begin(), needle.begin());
      
      CHECK(itr1 == itr2);
    }

    //*************************************************************************
    TEST(search_predicate)
    {
      std::string haystack = "ABCDFEGHIJKLMNOPQRSTUVWXYZ";
      std::string needle   = "KLMNO";

      std::string::iterator itr1 = std::search(haystack.begin(), haystack.end(), needle.begin(), needle.begin(), std::equal_to<char>());
      std::string::iterator itr2 = etlstd::search(haystack.begin(), haystack.end(), needle.begin(), needle.begin(), std::equal_to<char>());

      CHECK(itr1 == itr2);
    }

    //*************************************************************************
    TEST(heap)
    {
      Vector data1 = dataV;
      Vector data2 = dataV;

      std::make_heap(data1.begin(), data1.end());
      etlstd::make_heap(data2.begin(), data2.end());

      bool isEqual;

      CHECK(std::is_heap(data2.begin(), data2.end()));

      isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);

      std::pop_heap(data1.begin(), data1.end());
      etlstd::pop_heap(data2.begin(), data2.end());

      data1.pop_back();
      data2.pop_back();

      CHECK(std::is_heap(data1.begin(), data1.end()));
      CHECK(std::is_heap(data2.begin(), data2.end()));

      isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);

      CHECK(std::is_heap(data2.begin(), data2.end()));

      isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);

      data1.push_back(5);
      data2.push_back(5);

      std::push_heap(data1.begin(), data1.end());
      etlstd::push_heap(data2.begin(), data2.end());

      CHECK(std::is_heap(data2.begin(), data2.end()));
      
      isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(heap_greater)
    {
      Vector data1 = dataV;
      Vector data2 = dataV;

      std::make_heap(data1.begin(), data1.end(), Greater());
      etlstd::make_heap(data2.begin(), data2.end(), Greater());

      bool isEqual;

      CHECK(std::is_heap(data2.begin(), data2.end(), Greater()));

      isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);

      std::pop_heap(data1.begin(), data1.end(), Greater());
      etlstd::pop_heap(data2.begin(), data2.end(), Greater());

      data1.pop_back();
      data2.pop_back();

      CHECK(std::is_heap(data1.begin(), data1.end(), Greater()));
      CHECK(std::is_heap(data2.begin(), data2.end(), Greater()));

      isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);

      CHECK(std::is_heap(data2.begin(), data2.end(), Greater()));

      isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);

      data1.push_back(5);
      data2.push_back(5);

      std::push_heap(data1.begin(), data1.end(), Greater());
      etlstd::push_heap(data2.begin(), data2.end(), Greater());

      CHECK(std::is_heap(data2.begin(), data2.end(), Greater()));

      isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }
  };
}