// Copyright (c) 2023 Huawei Technologies Co., Ltd
// Copyright (c) 2019, Facebook CORPORATION.
// 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
//
// https://opensource.org/licenses/BSD-3-Clause
//
// 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/utils/OpAdapter.h"

namespace acl_op {
using npu_preparation = at_npu::native::OpPreparation;
using npu_utils = at_npu::native::NpuUtils;

namespace {
at::Tensor& ones_like_npu_out_nocheck(at::Tensor& self) {
  at_npu::native::OpCommand cmd;
  cmd.Name("OnesLike")
      .Input(self)
      .Output(self)
      .Run();
  return self;
}
}  // namespace

at::Tensor ones_like(
    const at::Tensor& self,
    c10::optional<c10::ScalarType> dtype_opt,
    c10::optional<c10::Layout> layout_opt,
    c10::optional<c10::Device> device_opt,
    c10::optional<bool> pin_memory_opt,
    c10::optional<c10::MemoryFormat> optional_memory_format) {
  auto device = c10::device_or_default(device_opt);
  if (!torch_npu::utils::is_npu(device)) {
    auto result = at::empty_like(self, dtype_opt, layout_opt, device_opt, pin_memory_opt, optional_memory_format);
    return result.fill_(1);
  }

  c10::TensorOptions option = c10::TensorOptions().dtype(dtype_opt)
      .device(device_opt)
      .layout(layout_opt)
      .pinned_memory(pin_memory_opt);
  at::Tensor result = npu_preparation::apply_tensor(self, option);

  return acl_op::one_(result);
}

at::Tensor& one_(at::Tensor& self) {
  if (!npu_utils::check_match(&self)) {
    at::Tensor contiguous_self = npu_utils::format_contiguous(self);
    ones_like_npu_out_nocheck(contiguous_self);
    npu_utils::format_fresh_view(self, contiguous_self);
  } else {
    ones_like_npu_out_nocheck(self);
  }
  return self;
}
}  // namespace acl_op