// Copyright (c) 2016-2019, The Monero Project
// Copyright (c)      2018, The Loki Project
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
// 
// 1. Redistributions of source code must retain the above copyright notice, this list of
//    conditions and the following disclaimer.
// 
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
//    of conditions and the following disclaimer in the documentation and/or other
//    materials provided with the distribution.
// 
// 3. Neither the name of the copyright holder nor the names of its contributors may be
//    used to endorse or promote products derived from this software without specific
//    prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#pragma once

#include <string>
#include <cstdio>
#include <cstdint>
#include "epee/misc_log_ex.h"

namespace tools
{

extern el::Level performance_timer_log_level;

class PerformanceTimer
{
public:
  PerformanceTimer(bool paused = false);
  void pause();
  void resume();
  void reset();
  uint64_t value() const;
  operator uint64_t() const  { return value(); }
  float milliseconds() const { return value() / 1.0e6; }
  float seconds() const      { return milliseconds() / 1000.f; }

protected:
  uint64_t ticks;
  bool started;
  bool paused;
};

class LoggingPerformanceTimer: public PerformanceTimer
{
public:
  LoggingPerformanceTimer(const std::string &s, const std::string &cat, uint64_t unit, el::Level l = el::Level::Info);
  ~LoggingPerformanceTimer();

private:
  std::string name;
  std::string cat;
  uint64_t unit;
  el::Level level;
};

void set_performance_timer_log_level(el::Level level);

#define PERF_TIMER_UNIT(name, unit) tools::LoggingPerformanceTimer pt_##name(#name, "perf." LOKI_DEFAULT_LOG_CATEGORY, unit, tools::performance_timer_log_level)
#define PERF_TIMER_UNIT_L(name, unit, l) tools::LoggingPerformanceTimer pt_##name(#name, "perf." LOKI_DEFAULT_LOG_CATEGORY, unit, l)
#define PERF_TIMER(name) PERF_TIMER_UNIT(name, 1000000)
#define PERF_TIMER_L(name, l) PERF_TIMER_UNIT_L(name, 1000000, l)
#define PERF_TIMER_START_UNIT(name, unit) std::unique_ptr<tools::LoggingPerformanceTimer> pt_##name(new tools::LoggingPerformanceTimer(#name, "perf." LOKI_DEFAULT_LOG_CATEGORY, unit, el::Level::Info))
#define PERF_TIMER_START(name) PERF_TIMER_START_UNIT(name, 1000000)
#define PERF_TIMER_STOP(name) do { pt_##name.reset(NULL); } while(0)
#define PERF_TIMER_PAUSE(name) pt_##name->pause()
#define PERF_TIMER_RESUME(name) pt_##name->resume()

}
