// Copyright (c) 2025 Huawei Technologies Co., Ltd
// All rights reserved.
//
// Licensed under the BSD 3-Clause License  (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "op_plugin/AclOpsInterface.h"
#include "op_plugin/OpApiInterface.h"
#include "op_plugin/utils/op_api_common.h"

namespace op_api {
using npu_preparation = at_npu::native::OpPreparation;

::std::tuple<at::Tensor, at::Tensor> npu_moe_token_permute_with_routing_map_grad_symint(
    const at::Tensor& permuted_token_out_grad,
    const c10::optional<at::Tensor>& probs_grad,
    const at::Tensor& sorted_indices,
    const at::Tensor& routing_map,
    c10::SymInt experts_num,
    c10::SymInt tokens_num,
    bool drop_and_pad) {
  auto token_num_int = tokens_num.expect_int();
  auto experts_num_int = experts_num.expect_int();
  auto output_size_0 = {token_num_int, permuted_token_out_grad.size(1)};
  auto output_size_1 = {token_num_int, experts_num.expect_int()};
  auto output_dtype_0 = permuted_token_out_grad.scalar_type();
  at::Tensor out1 = npu_preparation::apply_tensor_without_format(
      output_size_0, permuted_token_out_grad.options().dtype(output_dtype_0));
  at::Tensor out2;
  if (probs_grad.has_value() && probs_grad.value().defined()) {
    out2 = npu_preparation::apply_tensor_without_format(
        output_size_1, probs_grad.value().options().dtype(probs_grad.value().scalar_type()));
  }
  EXEC_NPU_CMD(
      aclnnMoeTokenPermuteWithRoutingMapGrad,
      permuted_token_out_grad,
      probs_grad,
      sorted_indices,
      routing_map,
      experts_num_int,
      token_num_int,
      drop_and_pad,
      out1,
      out2);
  return std::make_tuple(std::move(out1), std::move(out2));
}
} // namespace op_api