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

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

Copyright(c) 2016 jwellbelove

Permission is hereby granted, free of charge, to any person obtaining a copy
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 <array>
#include <algorithm>
#include <utility>
#include <iterator>
#include <string>
#include <vector>
#include <numeric>

#include "data.h"

#include "etl/unordered_set.h"
#include "etl/checksum.h"
#include "etl/hash.h"

namespace
{
  typedef TestDataDC<std::string>  DC;
  typedef TestDataNDC<std::string> NDC;
}

namespace etl
{
  template <>
  struct hash<NDC>
  {
    size_t operator ()(const NDC& e) const
    {
      size_t sum = 0U;
      return std::accumulate(e.value.begin(), e.value.end(), sum);
    }
  };
}

namespace
{
  SUITE(test_unordered_set)
  {
    static const size_t SIZE = 10;

    using ItemM = TestDataM<int>;

    struct simple_hash
    {
      size_t operator ()(const NDC& value) const
      {
        return etl::checksum<size_t>(value.value.begin(), value.value.end());
      }

      size_t operator ()(const ItemM& value) const
      {
        etl::checksum<size_t> sum;

        sum.add(value.valid);
        sum.add(value.value);

        return sum.value();
      }
    };

    using DataM = etl::unordered_set<ItemM, SIZE, SIZE, simple_hash>;

    typedef etl::unordered_set<DC,  SIZE, SIZE / 2, simple_hash> DataDC;
    typedef etl::unordered_set<NDC, SIZE, SIZE / 2, simple_hash> DataNDC;
    typedef etl::iunordered_set<NDC, simple_hash> IDataNDC;

    NDC N0  = NDC("FF");
    NDC N1  = NDC("FG");
    NDC N2  = NDC("FH");
    NDC N3  = NDC("FI");
    NDC N4  = NDC("FJ");
    NDC N5  = NDC("FK");
    NDC N6  = NDC("FL");
    NDC N7  = NDC("FM");
    NDC N8  = NDC("FN");
    NDC N9  = NDC("FO");
    NDC N10 = NDC("FP");
    NDC N11 = NDC("FQ");
    NDC N12 = NDC("FR");
    NDC N13 = NDC("FS");
    NDC N14 = NDC("FT");
    NDC N15 = NDC("FU");
    NDC N16 = NDC("FV");
    NDC N17 = NDC("FW");
    NDC N18 = NDC("FX");
    NDC N19 = NDC("FY");

    std::vector<NDC> initial_data;
    std::vector<NDC> excess_data;
    std::vector<NDC> different_data;

    //*************************************************************************
    struct SetupFixture
    {
      SetupFixture()
      {
        NDC n[] =
        {
          N0, N1, N2, N3, N4, N5, N6, N7, N8, N9
        };

        NDC n2[] =
        {
          N0, N1, N2, N3, N4, N5, N6, N7, N8, N9, N10
        };

        NDC n3[] =
        {
          N10, N11, N12, N13, N14, N15, N16, N17, N18, N19
        };

        initial_data.assign(std::begin(n), std::end(n));
        excess_data.assign(std::begin(n2), std::end(n2));
        different_data.assign(std::begin(n3), std::end(n3));
      }
    };

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_default_constructor)
    {
      DataDC data;

      CHECK_EQUAL(data.size(), size_t(0));
      CHECK(data.empty());
      CHECK_EQUAL(data.max_size(), SIZE);
      CHECK(data.begin() == data.end());
    }

#if ETL_CPP17_SUPPORTED && ETL_USING_INITIALIZER_LIST && !defined(ETL_TEMPLATE_DEDUCTION_GUIDE_TESTS_DISABLED)
    //*************************************************************************
    TEST(test_cpp17_deduced_constructor)
    {
      etl::unordered_set data{ N0, N1, N2, N3, N4, N5, N6, N7, N8, N9 };
      etl::unordered_set<NDC, 10U> check = { N0, N1, N2, N3, N4, N5, N6, N7, N8, N9 };

      CHECK(!data.empty());
      CHECK(data.full());
      CHECK(data.begin() != data.end());
      CHECK_EQUAL(10U, data.size());
      CHECK_EQUAL(0U, data.available());
      CHECK_EQUAL(10U, data.capacity());
      CHECK_EQUAL(10U, data.max_size());
      CHECK(data == check);
    }
#endif

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_constructor_range)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      CHECK(data.size() == SIZE);
      CHECK(!data.empty());
      CHECK(data.full());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_move_constructor)
    {
      DataM data1;

      ItemM d1(1);
      ItemM d2(2);
      ItemM d3(3);

      data1.insert(etl::move(d1));
      data1.insert(etl::move(d2));
      data1.insert(etl::move(d3));
      data1.insert(ItemM(4));

      DataM data2(std::move(data1));

      CHECK(!data1.empty()); // Move does not clear the source.

      CHECK_EQUAL(1, ItemM(1).value);
      CHECK_EQUAL(2, ItemM(2).value);
      CHECK_EQUAL(3, ItemM(3).value);
      CHECK_EQUAL(4, ItemM(4).value);
    }

    //*************************************************************************
    TEST(test_destruct_via_iunordered_set)
    {
      int current_count = NDC::get_instance_count();

      DataNDC* pdata = new DataNDC(initial_data.begin(), initial_data.end());

      IDataNDC* pidata = pdata;
      delete pidata;

      CHECK_EQUAL(current_count, NDC::get_instance_count());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_assignment)
    {
      DataNDC data(initial_data.begin(), initial_data.end());
      DataNDC other_data;

      other_data = data;

      bool isEqual = std::equal(data.begin(),
                                data.end(),
                                other_data.begin());

      CHECK(isEqual);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_assignment_interface)
    {
      DataNDC data1(initial_data.begin(), initial_data.end());
      DataNDC data2;

      IDataNDC& idata1 = data1;
      IDataNDC& idata2 = data2;

      idata2 = idata1;

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

      CHECK(isEqual);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_self_assignment)
    {
      DataNDC data(initial_data.begin(), initial_data.end());
      DataNDC other_data(data);

      other_data = other_data;

      bool isEqual = std::equal(data.begin(),
                                data.end(),
                                other_data.begin());

      CHECK(isEqual);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_move_assignment)
    {
      DataM data1;

      ItemM d1(1);
      ItemM d2(2);
      ItemM d3(3);

      data1.insert(etl::move(d1));
      data1.insert(etl::move(d2));
      data1.insert(etl::move(d3));
      data1.insert(ItemM(4));

      DataM data2;

      data2 = std::move(data1);

      CHECK(!data1.empty()); // Move does not clear the source.

      CHECK_EQUAL(1, ItemM(1).value);
      CHECK_EQUAL(2, ItemM(2).value);
      CHECK_EQUAL(3, ItemM(3).value);
      CHECK_EQUAL(4, ItemM(4).value);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_empty_full)
    {
      DataNDC data;

      CHECK(!data.full());
      CHECK(data.empty());

      data.insert(initial_data.begin(), initial_data.end());

      CHECK(data.full());
      CHECK(!data.empty());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_assign_range)
    {
      DataNDC data;

      data.assign(initial_data.begin(), initial_data.end());

      DataNDC::iterator idata;

      for (size_t i = 0UL; i < 10; ++i)
      {
        idata = data.find(initial_data[i]);
        CHECK(idata != data.end());
      }
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_insert_value)
    {
      DataNDC data;

      data.insert(N0);  // Inserted
      data.insert(N2);  // Inserted
      data.insert(N1);  // Inserted
      data.insert(N11); // Duplicate hash. Inserted
      data.insert(N3);  // Inserted

      CHECK_EQUAL(5U, data.size());

      DataNDC::iterator idata;

      idata = data.find(N0);
      CHECK(idata != data.end());
      CHECK(*idata == N0);

      idata = data.find(N1);
      CHECK(idata != data.end());
      CHECK(*idata == N1);

      idata = data.find(N2);
      CHECK(idata != data.end());
      CHECK(*idata == N2);

      idata = data.find(N11);
      CHECK(idata != data.end());
      CHECK(*idata == N11);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_insert_value_excess)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      CHECK_THROW(data.insert(N10), etl::unordered_set_full);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_insert_range)
    {
      DataNDC data;

      data.insert(initial_data.begin(), initial_data.end());

      for (size_t i = 0UL; i < data.size(); ++i)
      {
        DataNDC::iterator idata = data.find(initial_data[i]);
        CHECK(idata != data.end());
      }
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_insert_range_excess)
    {
      DataNDC data;

      CHECK_THROW(data.insert(excess_data.begin(), excess_data.end()), etl::unordered_set_full);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_insert_moved_value)
    {
      DataM data;

      ItemM d1(1);
      ItemM d2(2);
      ItemM d3(3);

      data.insert(etl::move(d1));
      data.insert(etl::move(d2));
      data.insert(etl::move(d3));
      data.insert(ItemM(4));

      CHECK(!bool(d1));
      CHECK(!bool(d2));
      CHECK(!bool(d3));

      CHECK_EQUAL(1, data.find(ItemM(1))->value);
      CHECK_EQUAL(2, data.find(ItemM(2))->value);
      CHECK_EQUAL(3, data.find(ItemM(3))->value);
      CHECK_EQUAL(4, data.find(ItemM(4))->value);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_key)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      size_t count = data.erase(N5);

      CHECK_EQUAL(1U, count);

      DataNDC::iterator idata = data.find(N5);
      CHECK(idata == data.end());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_single_iterator)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      DataNDC::iterator idata = data.find(N5);
      DataNDC::iterator inext = idata;
      ++inext;

      DataNDC::iterator iafter = data.erase(idata);
      idata = data.find(N5);

      CHECK(idata == data.end());
      CHECK(inext == iafter);

      // Test that erase really does erase from the pool.
      CHECK(!data.full());
      CHECK(!data.empty());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_single_const_iterator)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      DataNDC::const_iterator idata = data.find(N5);
      DataNDC::const_iterator inext = idata;
      ++inext;

      DataNDC::iterator iafter = data.erase(idata);
      idata = data.find(N5);

      CHECK(idata == data.cend());
      CHECK(inext == iafter);

      // Test that erase really does erase from the pool.
      CHECK(!data.full());
      CHECK(!data.empty());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_range)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      DataNDC::const_iterator idata = data.cbegin();
      std::advance(idata, 2);

      DataNDC::const_iterator idata_end = data.cbegin();
      std::advance(idata_end, 5);

      data.erase(idata, idata_end);

      CHECK_EQUAL(initial_data.size() - 3, data.size());
      CHECK(!data.full());
      CHECK(!data.empty());

      idata = data.find(N8);
      CHECK(idata != data.end());

      idata = data.find(N0);
      CHECK(idata != data.end());

      idata = data.find(N1);
      CHECK(idata == data.end());

      idata = data.find(N2);
      CHECK(idata == data.end());

      idata = data.find(N3);
      CHECK(idata != data.end());

      idata = data.find(N4);
      CHECK(idata != data.end());

      idata = data.find(N5);
      CHECK(idata != data.end());

      idata = data.find(N6);
      CHECK(idata == data.end());

      idata = data.find(N7);
      CHECK(idata != data.end());

      idata = data.find(N8);
      CHECK(idata != data.end());

      idata = data.find(N9);
      CHECK(idata != data.end());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_range_first_half)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      DataNDC::const_iterator end = data.cbegin();
      etl::advance(end, data.size() / 2);

      auto itr = data.erase(data.cbegin(), end);

      CHECK_EQUAL(initial_data.size() / 2, data.size());
      CHECK(!data.full());
      CHECK(!data.empty());
      CHECK(itr == end);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_range_last_half)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      DataNDC::const_iterator begin = data.cbegin();
      etl::advance(begin, data.size() / 2);

      auto itr = data.erase(begin, data.cend());

      CHECK_EQUAL(initial_data.size() / 2, data.size());
      CHECK(!data.full());
      CHECK(!data.empty());
      CHECK(itr == data.end());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_range_all)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      auto itr = data.erase(data.cbegin(), data.cend());

      CHECK_EQUAL(0U, data.size());
      CHECK(!data.full());
      CHECK(data.empty());
      CHECK(itr == data.end());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_clear)
    {
      DataNDC data(initial_data.begin(), initial_data.end());
      data.clear();

      CHECK_EQUAL(data.size(), size_t(0));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_count_key)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      size_t count = data.count(N5);
      CHECK_EQUAL(1U, count);

      count = data.count(N12);
      CHECK_EQUAL(0U, count);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_equal)
    {
      const DataNDC initial1(initial_data.begin(), initial_data.end());
      const DataNDC initial2(initial_data.begin(), initial_data.end());

      CHECK(initial1 == initial2);

      const DataNDC different(different_data.begin(), different_data.end());

      CHECK(!(initial1 == different));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_not_equal)
    {
      const DataNDC initial1(initial_data.begin(), initial_data.end());
      const DataNDC initial2(initial_data.begin(), initial_data.end());

      CHECK(!(initial1 != initial2));

      const DataNDC different(different_data.begin(), different_data.end());

      CHECK(initial1 != different);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_hash_function)
    {
      DataNDC data;
      DataNDC::hasher hash_function =  data.hash_function();

      CHECK_EQUAL(simple_hash()(NDC(std::string("ABCDEF"))), hash_function(NDC(std::string("ABCDEF"))));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_key_eq_function)
    {
      DataNDC data;
      DataNDC::key_equal key_eq = data.key_eq();

      CHECK(key_eq(NDC(std::string("ABCDEF")), NDC(std::string("ABCDEF"))));
      CHECK(!key_eq(NDC(std::string("ABCDEF")), NDC(std::string("ABCDEG"))));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_load_factor)
    {
      // Empty.
      DataNDC data;
      CHECK_CLOSE(0.0, data.load_factor(), 0.01);

      // Half the buckets used.
      data.assign(initial_data.begin(), initial_data.begin() + (initial_data.size() / 4));
      CHECK_CLOSE(0.4, data.load_factor(), 0.01);

      // All of the buckets used.
      data.clear();
      data.assign(initial_data.begin(), initial_data.end());
      CHECK_CLOSE(2.0, data.load_factor(), 0.01);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_insert_and_erase_bug)
    {
      etl::unordered_set<uint32_t, 5> set;

      set.insert(1);
      set.insert(2);
      set.insert(3);
      set.insert(4);

      auto it = set.find(1);
      set.erase(it);

      it = set.find(4);
      set.erase(it);

      std::vector<std::string> s;

      for (const auto &kv : set)
      {
        std::stringstream ss;
        ss << "set" << " = " << kv;
        s.push_back(ss.str());
      }

      CHECK_EQUAL(2, s.size());
      CHECK_EQUAL("set = 2", s[0]);
      CHECK_EQUAL("set = 3", s[1]);
    }
  };
}