//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

// <chrono>
// class year_month_weekday_last;

// constexpr year_month_weekday_last& operator+=(const years& d) noexcept;
// constexpr year_month_weekday_last& operator-=(const years& d) noexcept;

#include <cuda/std/cassert>
#include <cuda/std/chrono>
#include <cuda/std/type_traits>

#include "test_macros.h"

template <typename D, typename Ds>
__host__ __device__ constexpr bool testConstexpr(D d1)
{
  if (static_cast<int>((d1).year()) != 1)
  {
    return false;
  }
  if (static_cast<int>((d1 += Ds{1}).year()) != 2)
  {
    return false;
  }
  if (static_cast<int>((d1 += Ds{2}).year()) != 4)
  {
    return false;
  }
  if (static_cast<int>((d1 += Ds{12}).year()) != 16)
  {
    return false;
  }
  if (static_cast<int>((d1 -= Ds{1}).year()) != 15)
  {
    return false;
  }
  if (static_cast<int>((d1 -= Ds{2}).year()) != 13)
  {
    return false;
  }
  if (static_cast<int>((d1 -= Ds{12}).year()) != 1)
  {
    return false;
  }
  return true;
}

int main(int, char**)
{
  using year                    = cuda::std::chrono::year;
  using month                   = cuda::std::chrono::month;
  using weekday                 = cuda::std::chrono::weekday;
  using weekday_last            = cuda::std::chrono::weekday_last;
  using year_month_weekday_last = cuda::std::chrono::year_month_weekday_last;
  using years                   = cuda::std::chrono::years;

  static_assert(noexcept(cuda::std::declval<year_month_weekday_last&>() += cuda::std::declval<years>()));
  static_assert(noexcept(cuda::std::declval<year_month_weekday_last&>() -= cuda::std::declval<years>()));

  static_assert(
    cuda::std::is_same_v<year_month_weekday_last&,
                         decltype(cuda::std::declval<year_month_weekday_last&>() += cuda::std::declval<years>())>);
  static_assert(
    cuda::std::is_same_v<year_month_weekday_last&,
                         decltype(cuda::std::declval<year_month_weekday_last&>() -= cuda::std::declval<years>())>);

  constexpr weekday Tuesday = cuda::std::chrono::Tuesday;
  constexpr month January   = cuda::std::chrono::January;

  static_assert(
    testConstexpr<year_month_weekday_last, years>(year_month_weekday_last{year{1}, January, weekday_last{Tuesday}}),
    "");

  for (int i = 1000; i <= 1010; ++i)
  {
    year_month_weekday_last ymwd(year{i}, January, weekday_last{Tuesday});

    assert(static_cast<int>((ymwd += years{2}).year()) == i + 2);
    assert(ymwd.month() == January);
    assert(ymwd.weekday() == Tuesday);

    assert(static_cast<int>((ymwd).year()) == i + 2);
    assert(ymwd.month() == January);
    assert(ymwd.weekday() == Tuesday);

    assert(static_cast<int>((ymwd -= years{1}).year()) == i + 1);
    assert(ymwd.month() == January);
    assert(ymwd.weekday() == Tuesday);

    assert(static_cast<int>((ymwd).year()) == i + 1);
    assert(ymwd.month() == January);
    assert(ymwd.weekday() == Tuesday);
  }

  return 0;
}
