//  Copyright (c) 2014 Grant Mercer
//  Copyright (c) 2017-2020 Hartmut Kaiser
//
//  SPDX-License-Identifier: BSL-1.0
//  Distributed under the Boost Software License, Version 1.0. (See accompanying
//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

#pragma once

#include <hpx/modules/testing.hpp>
#include <hpx/parallel/algorithms/fill.hpp>

#include <cstddef>
#include <iostream>
#include <iterator>
#include <numeric>
#include <random>
#include <string>
#include <vector>

#include "test_utils.hpp"

///////////////////////////////////////////////////////////////////////////////
unsigned int seed = std::random_device{}();
std::mt19937 gen(seed);

template <typename IteratorTag>
void test_fill_n(IteratorTag)
{
    typedef std::vector<int>::iterator base_iterator;
    typedef test::test_iterator<base_iterator, IteratorTag> iterator;

    std::vector<int> c(10007);
    std::iota(std::begin(c), std::end(c), gen());

    hpx::fill_n(iterator(std::begin(c)), c.size(), 10);

    // verify values
    std::size_t count = 0;
    std::for_each(std::begin(c), std::end(c), [&count](int v) -> void {
        HPX_TEST_EQ(v, int(10));
        ++count;
    });
    HPX_TEST_EQ(count, c.size());
}

template <typename ExPolicy, typename IteratorTag>
void test_fill_n(ExPolicy policy, IteratorTag)
{
    static_assert(hpx::is_execution_policy<ExPolicy>::value,
        "hpx::is_execution_policy<ExPolicy>::value");

    typedef std::vector<int>::iterator base_iterator;
    typedef test::test_iterator<base_iterator, IteratorTag> iterator;

    std::vector<int> c(10007);
    std::iota(std::begin(c), std::end(c), gen());

    hpx::fill_n(policy, iterator(std::begin(c)), c.size(), 10);

    // verify values
    std::size_t count = 0;
    std::for_each(std::begin(c), std::end(c), [&count](int v) -> void {
        HPX_TEST_EQ(v, int(10));
        ++count;
    });
    HPX_TEST_EQ(count, c.size());
}

template <typename ExPolicy, typename IteratorTag>
void test_fill_n_async(ExPolicy p, IteratorTag)
{
    typedef std::vector<int>::iterator base_iterator;
    typedef test::test_iterator<base_iterator, IteratorTag> iterator;

    std::vector<int> c(10007);
    std::iota(std::begin(c), std::end(c), gen());

    hpx::future<iterator> f =
        hpx::fill_n(p, iterator(std::begin(c)), c.size(), 10);
    f.wait();

    std::size_t count = 0;
    std::for_each(std::begin(c), std::end(c), [&count](int v) -> void {
        HPX_TEST_EQ(v, int(10));
        ++count;
    });
    HPX_TEST_EQ(count, c.size());
}

///////////////////////////////////////////////////////////////////////////////
template <typename IteratorTag>
void test_fill_n_exception(IteratorTag)
{
    typedef std::vector<int>::iterator base_iterator;
    typedef test::decorated_iterator<base_iterator, IteratorTag>
        decorated_iterator;
    std::vector<int> c(10007);
    std::iota(std::begin(c), std::end(c), gen());

    bool caught_exception = false;
    try
    {
        hpx::fill_n(decorated_iterator(std::begin(c),
                        []() { throw std::runtime_error("test"); }),
            c.size(), 10);
        HPX_TEST(false);
    }
    catch (hpx::exception_list const& e)
    {
        caught_exception = true;
        test::test_num_exceptions<hpx::execution::sequenced_policy,
            IteratorTag>::call(hpx::execution::seq, e);
    }
    catch (...)
    {
        HPX_TEST(false);
    }

    HPX_TEST(caught_exception);
}

template <typename ExPolicy, typename IteratorTag>
void test_fill_n_exception(ExPolicy policy, IteratorTag)
{
    static_assert(hpx::is_execution_policy<ExPolicy>::value,
        "hpx::is_execution_policy<ExPolicy>::value");

    typedef std::vector<int>::iterator base_iterator;
    typedef test::decorated_iterator<base_iterator, IteratorTag>
        decorated_iterator;
    std::vector<int> c(10007);
    std::iota(std::begin(c), std::end(c), gen());

    bool caught_exception = false;
    try
    {
        hpx::fill_n(policy,
            decorated_iterator(
                std::begin(c), []() { throw std::runtime_error("test"); }),
            c.size(), 10);
        HPX_TEST(false);
    }
    catch (hpx::exception_list const& e)
    {
        caught_exception = true;
        test::test_num_exceptions<ExPolicy, IteratorTag>::call(policy, e);
    }
    catch (...)
    {
        HPX_TEST(false);
    }

    HPX_TEST(caught_exception);
}

template <typename ExPolicy, typename IteratorTag>
void test_fill_n_exception_async(ExPolicy p, IteratorTag)
{
    typedef std::vector<int>::iterator base_iterator;
    typedef test::decorated_iterator<base_iterator, IteratorTag>
        decorated_iterator;

    std::vector<int> c(10007);
    std::iota(std::begin(c), std::end(c), gen());

    bool caught_exception = false;
    bool returned_from_algorithm = false;
    try
    {
        hpx::future<decorated_iterator> f = hpx::fill_n(p,
            decorated_iterator(
                std::begin(c), []() { throw std::runtime_error("test"); }),
            c.size(), 10);
        returned_from_algorithm = true;
        f.get();

        HPX_TEST(false);
    }
    catch (hpx::exception_list const& e)
    {
        caught_exception = true;
        test::test_num_exceptions<ExPolicy, IteratorTag>::call(p, e);
    }
    catch (...)
    {
        HPX_TEST(false);
    }

    HPX_TEST(caught_exception);
    HPX_TEST(returned_from_algorithm);
}

//////////////////////////////////////////////////////////////////////////////
template <typename ExPolicy, typename IteratorTag>
void test_fill_n_bad_alloc(ExPolicy policy, IteratorTag)
{
    static_assert(hpx::is_execution_policy<ExPolicy>::value,
        "hpx::is_execution_policy<ExPolicy>::value");

    typedef std::vector<int>::iterator base_iterator;
    typedef test::decorated_iterator<base_iterator, IteratorTag>
        decorated_iterator;

    std::vector<int> c(100007);
    std::iota(std::begin(c), std::end(c), gen());

    bool caught_bad_alloc = false;
    try
    {
        hpx::fill_n(policy,
            decorated_iterator(std::begin(c), []() { throw std::bad_alloc(); }),
            c.size(), 10);
        HPX_TEST(false);
    }
    catch (std::bad_alloc const&)
    {
        caught_bad_alloc = true;
    }
    catch (...)
    {
        HPX_TEST(false);
    }

    HPX_TEST(caught_bad_alloc);
}

template <typename ExPolicy, typename IteratorTag>
void test_fill_n_bad_alloc_async(ExPolicy p, IteratorTag)
{
    typedef std::vector<int>::iterator base_iterator;
    typedef test::decorated_iterator<base_iterator, IteratorTag>
        decorated_iterator;

    std::vector<int> c(10007);
    std::iota(std::begin(c), std::end(c), gen());

    bool caught_bad_alloc = false;
    bool returned_from_algorithm = false;
    try
    {
        hpx::future<decorated_iterator> f = hpx::fill_n(p,
            decorated_iterator(std::begin(c), []() { throw std::bad_alloc(); }),
            c.size(), 10);
        returned_from_algorithm = true;
        f.get();

        HPX_TEST(false);
    }
    catch (std::bad_alloc const&)
    {
        caught_bad_alloc = true;
    }
    catch (...)
    {
        HPX_TEST(false);
    }

    HPX_TEST(caught_bad_alloc);
    HPX_TEST(returned_from_algorithm);
}
