//===----------------------------------------------------------------------===//
//
// 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, c++17
// <chrono>
// class year_month_day_last;

// constexpr year_month_day_last
//   operator/(const year_month& ym, last_spec) noexcept;
// Returns: {ym.year(), month_day_last{ym.month()}}.


// constexpr year_month_day_last
//   operator/(const year& y, const month_day_last& mdl) noexcept;
// Returns: {y, mdl}.
//
// constexpr year_month_day_last
//   operator/(int y, const month_day_last& mdl) noexcept;
// Returns: year(y) / mdl.
//
// constexpr year_month_day_last
//   operator/(const month_day_last& mdl, const year& y) noexcept;
// Returns: y / mdl.
//
// constexpr year_month_day_last
//   operator/(const month_day_last& mdl, int y) noexcept;
// Returns: year(y) / mdl.

#include <chrono>
#include <type_traits>
#include <cassert>

#include "test_macros.h"

int main(int, char**)
{
    using day                 = std::chrono::day;
    using month               = std::chrono::month;
    using year_month          = std::chrono::year_month;
    using year                = std::chrono::year;
    using month_day_last      = std::chrono::month_day_last;
    using year_month_day_last = std::chrono::year_month_day_last;

    constexpr month February = std::chrono::February;
    constexpr std::chrono::last_spec last = std::chrono::last;

    { // operator/(const year_month& ym, last_spec)
        constexpr year_month Feb2018{year{2018}, February};

        ASSERT_NOEXCEPT (                              Feb2018/last);
        ASSERT_SAME_TYPE(year_month_day_last, decltype(Feb2018/last));

        static_assert((Feb2018/last).year()  == year{2018}, "");
        static_assert((Feb2018/last).month() == February,   "");

        for (int i = 1000; i < 1010; ++i)
            for (unsigned j = 1; j <= 12; ++j)
            {
                year y{i};
                month m{j};
                year_month_day_last ymdl = year_month{y,m}/last;
                assert(ymdl.year()  == y);
                assert(ymdl.month() == m);
            }
    }


    { // operator/(const year& y, const month_day_last& mdl) (and switched)
        ASSERT_NOEXCEPT (                              year{2018}/month_day_last{February});
        ASSERT_SAME_TYPE(year_month_day_last, decltype(year{2018}/month_day_last{February}));
        ASSERT_NOEXCEPT (                              month_day_last{February}/year{2018});
        ASSERT_SAME_TYPE(year_month_day_last, decltype(month_day_last{February}/year{2018}));

        static_assert((year{2018}/month_day_last{February}).month() == February,   "");
        static_assert((year{2018}/month_day_last{February}).year()  == year{2018}, "");
        static_assert((month_day_last{February}/year{2018}).month() == February,   "");
        static_assert((month_day_last{February}/year{2018}).year()  == year{2018}, "");

        for (int i = 1000; i < 1010; ++i)
            for (unsigned j = 1; j <= 12; ++j)
            {
                year y{i};
                month m{j};
                year_month_day_last ymdl1 = y/month_day_last{m};
                year_month_day_last ymdl2 = month_day_last{m}/y;
                assert(ymdl1.month() == m);
                assert(ymdl2.month() == m);
                assert(ymdl2.year()  == y);
                assert(ymdl1.year()  == y);
                assert(ymdl1 == ymdl2);
            }
    }

    { // operator/(int y, const month_day_last& mdl) (and switched)
        ASSERT_NOEXCEPT (                              2018/month_day_last{February});
        ASSERT_SAME_TYPE(year_month_day_last, decltype(2018/month_day_last{February}));
        ASSERT_NOEXCEPT (                              month_day_last{February}/2018);
        ASSERT_SAME_TYPE(year_month_day_last, decltype(month_day_last{February}/2018));

        static_assert((2018/month_day_last{February}).month() == February,   "");
        static_assert((2018/month_day_last{February}).year()  == year{2018}, "");
        static_assert((month_day_last{February}/2018).month() == February,   "");
        static_assert((month_day_last{February}/2018).year()  == year{2018}, "");

        for (int i = 1000; i < 1010; ++i)
            for (unsigned j = 1; j <= 12; ++j)
            {
                year y{i};
                month m{j};
                year_month_day_last ymdl1 = i/month_day_last{m};
                year_month_day_last ymdl2 = month_day_last{m}/i;
                assert(ymdl1.month() == m);
                assert(ymdl2.month() == m);
                assert(ymdl2.year()  == y);
                assert(ymdl1.year()  == y);
                assert(ymdl1 == ymdl2);
            }
    }

    // the result of year_month_day_last::day() is unspecified when !ok(),
    // but it shouldn't crash.
    {
        year_month_day_last ymdl = year{2020}/month{13}/last;
        assert(!ymdl.ok());
        day d = ymdl.day(); (void)d; // doesn't crash
    }

    return 0;
}
