#ifndef QTCONTROL_SRC_UTILS_STOPWATCH_H_
#define QTCONTROL_SRC_UTILS_STOPWATCH_H_
#include "chrono"

class StopWatch {
 public:
  static StopWatch& GetInstance() {
    static StopWatch instance;
    return instance;
  }
  using Clock = std::chrono::high_resolution_clock;
  /**
   * @brief 开始计时, 所有时间从开始
   */
  void Start() {
    if (!is_running_) {
      start_time_ = Clock::now();
      is_running_ = true;
    }
  }
  /**
   * @brief 暂时记时
   */
  void Stop() {
    if (is_running_) {
      auto end_time = Clock::now();
      elapsed_time_ +=
          std::chrono::duration<double>(end_time - start_time_).count();
      is_running_ = false;
    }
  }

  double ElapsedTimeS() const {
    if (is_running_) {
      auto current_time = Clock::now();
      return elapsed_time_ +
             std::chrono::duration<double>(current_time - start_time_).count();
    }
    return elapsed_time_;
  }

  double ElapsedTimeMs() const { return ElapsedTimeS() * 1000.0; }
  double ElapsedTimeUs() const { return ElapsedTimeS() * 1e6; }
  void Reset() {
    elapsed_time_ = 0.0;
    is_running_ = false;
  }

  StopWatch(const StopWatch&) = delete;
  StopWatch& operator=(const StopWatch&) = delete;

 private:
  StopWatch() = default;
  double elapsed_time_; /* 累积的时间，单位为秒 */
  Clock::time_point start_time_;
  bool is_running_;
};
#endif  // QTCONTROL_SRC_UTILS_STOPWATCH_H_