// Copyright (c) 2020 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 <vector>
#include "lite/model_parser/base/block_desc.h"
#include "lite/model_parser/flatbuffers/framework_generated.h"
#include "lite/model_parser/flatbuffers/op_desc.h"
#include "lite/model_parser/flatbuffers/var_desc.h"
#include "lite/utils/all.h"

namespace paddle {
namespace lite {
namespace fbs {

class BlockDesc : public BlockDescAPI {
 public:
  explicit BlockDesc(proto::BlockDesc const* desc) : desc_(desc) {
    CHECK(desc_);
    vars_.reserve(VarsSize());
    ops_.reserve(OpsSize());
    for (size_t idx = 0; idx < VarsSize(); ++idx) {
      vars_.push_back(VarDesc(desc_->vars()->Get(idx)));
    }
    for (size_t idx = 0; idx < OpsSize(); ++idx) {
      ops_.push_back(OpDesc(desc_->ops()->Get(idx)));
    }
  }

  int32_t Idx() const override { return desc_->idx(); }

  int32_t ParentIdx() const override { return desc_->parent_idx(); }

  size_t VarsSize() const override { return desc_->vars()->size(); }

  template <typename T>
  T const* GetVar(int32_t idx) const;

  template <typename T>
  T* GetVar(int32_t idx) {
    NotImplemented();
    return nullptr;
  }

  size_t OpsSize() const override {
    CHECK(desc_);
    CHECK(desc_->ops());
    return desc_->ops()->size();
  }

  template <typename T>
  T const* GetOp(int32_t idx) const;

  template <typename T>
  T* GetOp(int32_t idx) {
    NotImplemented();
    return nullptr;
  }

  const std::vector<VarDesc>& GetVars() const { return vars_; }

  int32_t ForwardBlockIdx() const override {
    return desc_->forward_block_idx();
  }

  BlockDesc() { NotImplemented(); }

 private:
  proto::BlockDesc const* desc_;  // not_own
  std::vector<VarDesc> vars_;
  std::vector<OpDesc> ops_;

 private:
  void NotImplemented() const {
    LOG(FATAL) << "The additional interfaces of BlockDesc is temporarily "
                  "unavailable in read-only mode.";
  }
};

}  // namespace fbs
}  // namespace lite
}  // namespace paddle
