/* Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

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. */

#pragma once

#include <string>

#include "paddle/fluid/framework/op_info.h"
#include "paddle/fluid/framework/shape_inference.h"
#include "paddle/phi/core/meta_tensor.h"
namespace phi {
class InferMetaContext;
}  // namespace phi

namespace paddle {
namespace framework {

phi::InferMetaContext BuildInferMetaContext(InferShapeContext* ctx,
                                            const std::string& op_type);

#define DECLARE_INFER_SHAPE_FUNCTOR(op_type, functor_name, fn)      \
  struct functor_name : public paddle::framework::InferShapeBase {  \
    void operator()(                                                \
        paddle::framework::InferShapeContext* ctx) const override { \
      auto infer_meta_context =                                     \
          paddle::framework::BuildInferMetaContext(ctx, #op_type);  \
      fn(&infer_meta_context);                                      \
    }                                                               \
  }

// TODO(chenweihang): Support TensorArray later
class CompatMetaTensor : public phi::MetaTensor {
 public:
  CompatMetaTensor(InferShapeVarPtr var, bool is_runtime)
      : var_(std::move(var)), is_runtime_(is_runtime) {}

  CompatMetaTensor() = default;
  CompatMetaTensor(const CompatMetaTensor&) = default;
  CompatMetaTensor(CompatMetaTensor&&) = default;
  CompatMetaTensor& operator=(const CompatMetaTensor&) = delete;
  CompatMetaTensor& operator=(CompatMetaTensor&&) = delete;

  int64_t numel() const override;

  DDim dims() const override;

  phi::DataType dtype() const override;

  DataLayout layout() const override;

  void set_dims(const DDim& dims) override;

  void set_dtype(phi::DataType dtype) override;

  void set_layout(DataLayout layout) override;

  void share_lod(const MetaTensor& meta_tensor) override;

  void share_dims(const MetaTensor& meta_tensor) override;

  void share_meta(const MetaTensor& meta_tensor) override;

 private:
  const LoD& GetRuntimeLoD() const {
    auto* var = BOOST_GET_CONST(Variable*, var_);
    return var->Get<LoDTensor>().lod();
  }

  int32_t GetCompileTimeLoD() const {
    auto* var = BOOST_GET_CONST(VarDesc*, var_);
    return var->GetLoDLevel();
  }

  const phi::SelectedRows& GetSelectedRows() const {
    PADDLE_ENFORCE_EQ(is_runtime_, true,
                      platform::errors::Unavailable(
                          "Only can get Tensor from MetaTensor in rumtime."));
    auto* var = BOOST_GET_CONST(Variable*, var_);
    PADDLE_ENFORCE_EQ(var->IsType<phi::SelectedRows>(), true,
                      platform::errors::Unavailable(
                          "The Tensor in MetaTensor is not SelectedRows."));
    return var->Get<phi::SelectedRows>();
  }

  InferShapeVarPtr var_;
  bool is_runtime_;
};

}  // namespace framework
}  // namespace paddle