/* 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 <atomic>
#include <cstdint>
#include <functional>
#include <list>
#include <memory>
#include "paddle/fluid/platform/macros.h"
#include "paddle/fluid/platform/profiler/event_node.h"
#include "paddle/fluid/platform/profiler/tracer_base.h"

namespace paddle {
namespace platform {

struct ProfilerOptions {
  uint32_t trace_level = 0;
};

class Profiler {
 public:
  static std::unique_ptr<Profiler> Create(const ProfilerOptions& options);

  void Prepare();

  void Start();

  std::unique_ptr<NodeTrees> Stop();

  ~Profiler();

 private:
  class TracerHolder {
   public:
    TracerHolder(TracerBase* tracer, bool owned)
        : tracer(tracer), owned(owned) {}
    ~TracerHolder() {
      if (owned) {
        delete tracer;
      }
    }

    TracerBase& Get() { return *tracer; }

   private:
    TracerBase* tracer;
    bool owned;
  };

  explicit Profiler(const ProfilerOptions& options);

  DISABLE_COPY_AND_ASSIGN(Profiler);

  static std::atomic<bool> alive_;
  ProfilerOptions options_;
  uint64_t start_ns_ = UINT64_MAX;
  std::list<TracerHolder> tracers_;
};

}  // namespace platform
}  // namespace paddle