// -*- C++ -*-
// { dg-options "-std=gnu++17 -ltbb" }
// { dg-do run { target c++17 } }
// { dg-require-effective-target tbb-backend }

//===-- partition_copy.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
//
//===----------------------------------------------------------------------===//

// Tests for stable_partition and partition_copy
#include "pstl/pstl_test_config.h"

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

#include "pstl/test_utils.h"

#include <cstdlib>
#include <iterator>

using namespace TestUtils;

struct test_partition_copy
{
    template <typename Policy, typename InputIterator, typename OutputIterator, typename OutputIterator2,
              typename UnaryOp>
    void
    operator()(Policy&& exec, InputIterator first, InputIterator last, OutputIterator true_first,
               OutputIterator true_last, OutputIterator2 false_first, OutputIterator2 false_last, UnaryOp unary_op)
    {

        auto actual_ret = std::partition_copy(exec, first, last, true_first, false_first, unary_op);

        EXPECT_TRUE(std::distance(true_first, actual_ret.first) == std::count_if(first, last, unary_op),
                    "partition_copy has wrong effect from true sequence");
        EXPECT_TRUE(std::distance(false_first, actual_ret.second) ==
                        std::count_if(first, last, __pstl::__internal::__not_pred<UnaryOp>(unary_op)),
                    "partition_copy has wrong effect from false sequence");
    }

    //dummy specialization by iterator type and policy type, in case of broken configuration
#if _PSTL_ICC_1800_TEST_MONOTONIC_RELEASE_64_BROKEN
    template <typename InputIterator, typename OutputIterator, typename OutputIterator2, typename UnaryOp>
    void
    operator()(pstl::execution::unsequenced_policy, std::reverse_iterator<InputIterator> first,
               std::reverse_iterator<InputIterator> last, std::reverse_iterator<OutputIterator> true_first,
               std::reverse_iterator<OutputIterator> true_last, std::reverse_iterator<OutputIterator2> false_first,
               OutputIterator2 false_last, UnaryOp unary_op)
    {
    }
    template <typename InputIterator, typename OutputIterator, typename OutputIterator2, typename UnaryOp>
    void
    operator()(pstl::execution::parallel_unsequenced_policy, std::reverse_iterator<InputIterator> first,
               std::reverse_iterator<InputIterator> last, std::reverse_iterator<OutputIterator> true_first,
               std::reverse_iterator<OutputIterator> true_last, std::reverse_iterator<OutputIterator2> false_first,
               OutputIterator2 false_last, UnaryOp unary_op)
    {
    }
#endif
};

template <typename T, typename UnaryPred>
void
test(UnaryPred pred)
{

    const std::size_t max_size = 100000;
    Sequence<T> in(max_size, [](std::size_t v) -> T { return T(v); });
    Sequence<T> actual_true(max_size);
    Sequence<T> actual_false(max_size);
    for (std::size_t n = 0; n <= max_size; n = n <= 16 ? n + 1 : std::size_t(3.1415 * n))
    {

        // for non-const input iterators
        invoke_on_all_policies(test_partition_copy(), in.begin(), in.begin() + n, actual_true.begin(),
                               actual_true.begin() + n, actual_false.begin(), actual_false.begin() + n, pred);

        // for const input iterators
        invoke_on_all_policies(test_partition_copy(), in.cbegin(), in.cbegin() + n, actual_true.begin(),
                               actual_true.begin() + n, actual_false.begin(), actual_false.begin() + n, pred);
    }
}

struct test_non_const
{
    template <typename Policy, typename InputIterator, typename OutputInterator>
    void
    operator()(Policy&& exec, InputIterator input_iter, OutputInterator out_iter)
    {
        auto is_even = [&](float64_t v) {
            uint32_t i = (uint32_t)v;
            return i % 2 == 0;
        };

        partition_copy(exec, input_iter, input_iter, out_iter, out_iter, non_const(is_even));
    }
};

int32_t
main()
{
    test<int32_t>([](const int32_t value) { return value % 2; });

#if !_PSTL_ICC_16_17_TEST_REDUCTION_RELEASE_BROKEN
    test<int32_t>([](const int32_t value) { return true; });
#endif

    test<float64_t>([](const float64_t value) { return value > 2 << 6; });
    test<Wrapper<float64_t>>([](const Wrapper<float64_t>& value) -> bool { return value.get_my_field() != nullptr; });

    test_algo_basic_double<int32_t>(run_for_rnd_bi<test_non_const>());

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