// -*- C++ -*-
//===-- replace.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
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++03, c++11, c++14

#include "support/pstl_test_config.h"

#include <execution>
#include <algorithm>

#include "support/utils.h"

using namespace TestUtils;

// This class is needed to check the self-copying
struct copy_int
{
    int32_t value;
    int32_t copied_times = 0;
    constexpr explicit copy_int(int32_t val = 0) : value(val) {}

    constexpr copy_int&
    operator=(const copy_int& other)
    {
        if (&other == this)
            copied_times++;
        else
        {
            value = other.value;
            copied_times = other.copied_times;
        }
        return *this;
    }

    constexpr bool
    operator==(const copy_int& other) const
    {
        return (value == other.value);
    }
};

template <typename Iterator>
struct test_one_policy
{
    std::size_t len;
    Iterator data_b;
    Iterator data_e;
    test_one_policy(Iterator data_, std::size_t len_)
    {
        len = len_;
        data_b = data_;
        data_e = std::next(data_b, len);
    }
    template <typename ExecutionPolicy, typename Iterator1, typename Iterator2, typename T, typename Predicate>
    void
    operator()(ExecutionPolicy&& exec, Iterator1 expected_b, Iterator1 expected_e, Iterator2 actual_b,
               Iterator2 actual_e, Predicate pred, const T& value, const T& old_value)
    {
        using namespace std;

        copy(data_b, data_e, expected_b);
        copy(data_b, data_e, actual_b);

        replace(expected_b, expected_e, old_value, value);
        replace(exec, actual_b, actual_e, old_value, value);

        EXPECT_TRUE((check<T, Iterator2>(actual_b, actual_e)), "wrong result of self assignment check");
        EXPECT_TRUE(equal(expected_b, expected_e, actual_b), "wrong result of replace");

        copy(data_b, data_e, expected_b);
        copy(data_b, data_e, actual_b);

        replace_if(expected_b, expected_e, pred, value);
        replace_if(exec, actual_b, actual_e, pred, value);
        EXPECT_TRUE(equal(expected_b, expected_e, actual_b), "wrong result of replace_if");
    }

    template <typename T, typename Iterator1>
    bool check(Iterator1, Iterator1)
    {
        return true;
    }

    template <typename T, typename Iterator1>
    typename std::enable_if<std::is_same<T, copy_int>::value, bool>::type_t
    check(Iterator1 b, Iterator1 e)
    {
        return std::all_of(b, e, [](const copy_int& elem) { return elem.copied_times == 0; });
    }
};

template <typename T1, typename T2, typename Pred>
void
test(Pred pred)
{
    typedef typename Sequence<T2>::iterator iterator_type;

    const std::size_t max_len = 100000;

    static constexpr T1 value = T1(0);
    static constexpr T1 new_value = T1(666);

    Sequence<T2> expected(max_len);
    Sequence<T2> actual(max_len);

    Sequence<T2> data(max_len, [](std::size_t i) {
        if (i % 3 == 2)
        {
            return T1(i);
        }
        else
        {
            return value;
        }
    });

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

        invoke_on_all_policies(temp, expected.begin(), expected.begin() + len, actual.begin(), actual.begin() + len,
                               pred, new_value, value);
    }
}

template <typename T>
struct test_non_const
{
    template <typename Policy, typename Iterator>
    void
    operator()(Policy&& exec, Iterator iter)
    {
        auto is_even = [&](float64_t v) {
            uint32_t i = (uint32_t)v;
            return i % 2 == 0;
        };
        invoke_if(exec, [&]() { replace_if(exec, iter, iter, non_const(is_even), T(0)); });
    }
};

int
main()
{
    test<int32_t, float32_t>(__pstl::__internal::__equal_value<int32_t>(666));
    test<uint16_t, uint8_t>([](const uint16_t& elem) { return elem % 3 < 2; });
    test<float64_t, int64_t>([](const float64_t& elem) { return elem * elem - 3.5 * elem > 10; });
    test<copy_int, copy_int>([](const copy_int& val) { return val.value / 5 > 2; });

    test_algo_basic_single<int32_t>(run_for_rnd_fw<test_non_const<int32_t>>());

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