//===----------------------------------------------------------------------===//
//
// 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++98, c++03, c++11

// <chrono>
// class year_month;

// constexpr year_month& operator+=(const years& d) noexcept;
// constexpr year_month& 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 month      = cuda::std::chrono::month;
  using year       = cuda::std::chrono::year;
  using years      = cuda::std::chrono::years;
  using year_month = cuda::std::chrono::year_month;

  ASSERT_NOEXCEPT(cuda::std::declval<year_month&>() += cuda::std::declval<years>());
  ASSERT_SAME_TYPE(year_month&, decltype(cuda::std::declval<year_month&>() += cuda::std::declval<years>()));

  ASSERT_NOEXCEPT(cuda::std::declval<year_month&>() -= cuda::std::declval<years>());
  ASSERT_SAME_TYPE(year_month&, decltype(cuda::std::declval<year_month&>() -= cuda::std::declval<years>()));

  static_assert(testConstexpr<year_month, years>(year_month{year{1}, month{1}}), "");

  for (int i = 1000; i <= 1010; ++i)
  {
    month m{2};
    year_month ym(year{i}, m);
    assert(static_cast<int>((ym += years{2}).year()) == i + 2);
    assert(ym.month() == m);
    assert(static_cast<int>((ym).year()) == i + 2);
    assert(ym.month() == m);
    assert(static_cast<int>((ym -= years{1}).year()) == i + 1);
    assert(ym.month() == m);
    assert(static_cast<int>((ym).year()) == i + 1);
    assert(ym.month() == m);
  }

  return 0;
}
