/**
 * Copyright (c) 2025 Huawei Technologies Co., Ltd.
 * This program is free software, you can redistribute it and/or modify it under the terms and conditions of
 * CANN Open Software License Agreement Version 2.0 (the "License").
 * Please refer to the License for details. You may not use this file except in compliance with the License.
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE.
 * See LICENSE in the root of the software repository for the full text of the License.
 */

#ifndef UDF_MEMORY_STATISTIC_MANAGER_H
#define UDF_MEMORY_STATISTIC_MANAGER_H

#include <cstdint>
#include <mutex>
#include <thread>
#include <string>
#include <condition_variable>

namespace FlowFunc {
class MemoryStatisticManager {
 public:
  static MemoryStatisticManager &Instance();

  void Init(const std::string &xsmem_group_name);

  void Finalize();

 private:
  MemoryStatisticManager() = default;

  ~MemoryStatisticManager();

  void DumpMetrics() const;

  void RunStatistic();

  void StatisticRss();

  void StatisticXsmem();

  static std::string GetProcessStatusFile();

  static std::string GetXsmemSummaryFile();

  bool ReadRssValue(uint64_t &vm_rss, uint64_t &vm_hwm) const;

  bool ReadXsmemValue(uint64_t &real_size, uint64_t &peak_size) const;

  // use for notify thread exit immediately
  std::mutex mtx_;
  std::condition_variable thread_condition_;
  volatile bool thread_run_flag_ = false;
  std::thread statistic_thread_;
  std::string xsmem_group_name_;

  std::string process_status_file_name_;
  std::string xsmem_summary_file_name_;

  volatile double rss_avg_{0};
  volatile uint64_t rss_hwm_{0};
  volatile uint32_t rss_statistic_count_{0};

  volatile double xsmem_avg_{0};
  volatile uint64_t xsmem_hwm_{0};
  volatile uint32_t xsmem_statistic_count_{0};
};
}  // namespace FlowFunc
#endif  // UDF_MEMORY_STATISTIC_MANAGER_H