/*
//@HEADER
// ************************************************************************
//
//                        Kokkos v. 3.0
//       Copyright (2020) National Technology & Engineering
//               Solutions of Sandia, LLC (NTESS).
//
// Under the terms of Contract DE-NA0003525 with NTESS,
// the U.S. Government retains certain rights in this software.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY NTESS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NTESS OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact Christian R. Trott (crtrott@sandia.gov)
//
// ************************************************************************
//@HEADER
*/

#include <TestStdAlgorithmsCommon.hpp>
#include <iterator>
#include <algorithm>

namespace Test {
namespace stdalgos {
namespace Find {

namespace KE = Kokkos::Experimental;

template <class ViewType>
void test_find(const ViewType view) {
  using value_t           = typename ViewType::value_type;
  using view_host_space_t = Kokkos::View<value_t*, Kokkos::HostSpace>;

  view_host_space_t expected("count_expected", view.extent(0));
  compare_views(expected, view);
  constexpr value_t find_value = 13;

  // value not found, return last
  EXPECT_EQ(KE::end(expected),
            std::find(KE::begin(expected), KE::end(expected), find_value));

  // pass const iterators, returns const iterator
  EXPECT_EQ(KE::cend(view),
            KE::find(exespace(), KE::cbegin(view), KE::cend(view), find_value));
  // pass view, returns iterator
  EXPECT_EQ(KE::end(view), KE::find(exespace(), view, find_value));

  fill_views_inc(view, expected);

  auto std_result =
      std::find(KE::begin(expected), KE::end(expected), find_value);
  auto distance = std::distance(KE::begin(expected), std_result);

  // pass iterators, returns iterator
  EXPECT_EQ(KE::begin(view) + distance,
            KE::find(exespace(), KE::begin(view), KE::end(view), find_value));
  // pass view, returns iterator
  EXPECT_EQ(KE::begin(view) + distance, KE::find(exespace(), view, find_value));
}

template <class ViewType>
void test_find_if(const ViewType view) {
  using value_t           = typename ViewType::value_type;
  using view_host_space_t = Kokkos::View<value_t*, Kokkos::HostSpace>;

  view_host_space_t expected("count_expected", view.extent(0));
  compare_views(expected, view);

  const auto not_equals_zero = NotEqualsZeroFunctor<value_type>();

  // value not found, return last
  EXPECT_EQ(
      KE::end(expected),
      std::find_if(KE::begin(expected), KE::end(expected), not_equals_zero));

  // pass iterators, returns iterator
  EXPECT_EQ(KE::end(view), KE::find_if(exespace(), KE::begin(view),
                                       KE::end(view), not_equals_zero));
  // pass view, returns iterator
  EXPECT_EQ(KE::end(view), KE::find_if(exespace(), view, not_equals_zero));

  fill_views_inc(view, expected);

  constexpr value_t find_value = 13;
  const auto equals_val        = EqualsValFunctor<value_type>(find_value);
  auto std_result =
      std::find_if(KE::begin(expected), KE::end(expected), equals_val);
  auto distance = std::distance(KE::begin(expected), std_result);

  // pass const iterators, returns const iterator
  EXPECT_EQ(
      KE::cbegin(view) + distance,
      KE::find_if(exespace(), KE::cbegin(view), KE::cend(view), equals_val));
  // pass view, returns iterator
  EXPECT_EQ(KE::begin(view) + distance,
            KE::find_if(exespace(), view, equals_val));
}

template <class ViewType>
void test_find_if_not(const ViewType view) {
  using value_t           = typename ViewType::value_type;
  using view_host_space_t = Kokkos::View<value_t*, Kokkos::HostSpace>;

  view_host_space_t expected("count_expected", view.extent(0));
  compare_views(expected, view);

  const auto not_equals_zero = NotEqualsZeroFunctor<value_type>();

  // first value matches
  EXPECT_EQ(KE::begin(expected),
            std::find_if_not(KE::begin(expected), KE::end(expected),
                             not_equals_zero));

  // pass iterators, returns iterator
  EXPECT_EQ(KE::begin(view), KE::find_if_not(exespace(), KE::begin(view),
                                             KE::end(view), not_equals_zero));
  // pass view, returns iterator
  EXPECT_EQ(KE::begin(view),
            KE::find_if_not(exespace(), view, not_equals_zero));

  fill_views_inc(view, expected);

  const auto equals_zero = EqualsValFunctor<value_type>(0);
  auto std_result =
      std::find_if_not(KE::begin(expected), KE::end(expected), equals_zero);
  auto distance = std::distance(KE::begin(expected), std_result);

  // pass const iterators, returns const iterator
  EXPECT_EQ(KE::cbegin(view) + distance,
            KE::find_if_not(exespace(), KE::cbegin(view), KE::cend(view),
                            equals_zero));
  // pass view, returns const iterator
  EXPECT_EQ(KE::begin(view) + distance,
            KE::find_if_not(exespace(), view, equals_zero));
}

template <class Tag, class ValueType>
void run_all_scenarios() {
  for (const auto& scenario : default_scenarios) {
    {
      auto view = create_view<ValueType>(Tag{}, scenario.second, "find");
      test_find(view);
    }
    {
      auto view = create_view<ValueType>(Tag{}, scenario.second, "find_if");
      test_find_if(view);
    }
    {
      auto view = create_view<ValueType>(Tag{}, scenario.second, "find_if_not");
      test_find_if_not(view);
    }
  }
}

TEST(std_algorithms_find_test, test) {
  run_all_scenarios<DynamicTag, double>();
  run_all_scenarios<StridedTwoTag, int>();
  run_all_scenarios<StridedThreeTag, unsigned>();
}

}  // namespace Find
}  // namespace stdalgos
}  // namespace Test