// -*- C++ -*-
// { dg-options "-ltbb" }
// { dg-do run { target c++17 } }
// { dg-timeout-factor 3 }
// { dg-require-effective-target tbb_backend }

//===-- reverse.pass.cpp --------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "pstl/pstl_test_config.h"

#ifdef PSTL_STANDALONE_TESTS
#include <iterator>

#include "pstl/execution"
#include "pstl/algorithm"
#else
#include <execution>
#include <algorithm>
#endif // PSTL_STANDALONE_TESTS

#include "pstl/test_utils.h"

using namespace TestUtils;

struct test_one_policy
{
#if defined(_PSTL_ICC_18_VC141_TEST_SIMD_LAMBDA_RELEASE_BROKEN) || defined(_PSTL_ICC_17_VC141_TEST_SIMD_LAMBDA_DEBUG_32_BROKEN) ||       \
    defined(_PSTL_ICC_16_VC14_TEST_SIMD_LAMBDA_DEBUG_32_BROKEN) // dummy specialization by policy type, in case of broken configuration
    template <typename Iterator1, typename Iterator2>
    typename std::enable_if<is_same_iterator_category<Iterator1, std::random_access_iterator_tag>::value, void>::type
    operator()(__pstl::execution::unsequenced_policy, Iterator1 data_b, Iterator1 data_e, Iterator2 actual_b,
               Iterator2 actual_e)
    {
    }
    template <typename Iterator1, typename Iterator2>
    typename std::enable_if<is_same_iterator_category<Iterator1, std::random_access_iterator_tag>::value, void>::type
    operator()(__pstl::execution::parallel_unsequenced_policy, Iterator1 data_b, Iterator1 data_e, Iterator2 actual_b,
               Iterator2 actual_e)
    {
    }
#endif

    template <typename ExecutionPolicy, typename Iterator1, typename Iterator2>
    typename std::enable_if<!is_same_iterator_category<Iterator1, std::forward_iterator_tag>::value>::type
    operator()(ExecutionPolicy&& exec, Iterator1 data_b, Iterator1 data_e, Iterator2 actual_b, Iterator2 actual_e)
    {
        using namespace std;

        copy(data_b, data_e, actual_b);

        reverse(exec, actual_b, actual_e);

        bool check = equal(data_b, data_e, reverse_iterator<Iterator2>(actual_e));

        EXPECT_TRUE(check, "wrong result of reverse");
    }

    template <typename ExecutionPolicy, typename Iterator1, typename Iterator2>
    typename std::enable_if<is_same_iterator_category<Iterator1, std::forward_iterator_tag>::value>::type
    operator()(ExecutionPolicy&&, Iterator1, Iterator1, Iterator2, Iterator2)
    {
    }
};

template <typename T>
void
test()
{
    const std::size_t max_len = 100000;

    Sequence<T> actual(max_len);

    Sequence<T> data(max_len, [](std::size_t i) { return T(i); });

    for (std::size_t len = 0; len < max_len; len = len <= 16 ? len + 1 : std::size_t(3.1415 * len))
    {
        invoke_on_all_policies(test_one_policy(), data.begin(), data.begin() + len, actual.begin(),
                               actual.begin() + len);
    }
}

template <typename T>
struct wrapper
{
    T t;
    wrapper() {}
    explicit wrapper(T t_) : t(t_) {}
    bool
    operator==(const wrapper<T>& a) const
    {
        return t == a.t;
    }
};

int
main()
{
    test<int32_t>();
    test<uint16_t>();
    test<float64_t>();
#if !defined(_PSTL_ICC_17_TEST_MAC_RELEASE_32_BROKEN)
    test<wrapper<float64_t>>();
#endif

    std::cout << done() << std::endl;
    return 0;
}
