// Copyright (c) 2016, The Monero 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
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#pragma once

#include <string>
#include <stdio.h>
#include "misc_log_ex.h"

#undef MONERO_DEFAULT_LOG_CATEGORY
#define MONERO_DEFAULT_LOG_CATEGORY "perf"

namespace tools
{

class PerformanceTimer;

extern el::Level performance_timer_log_level;
extern __thread std::vector<PerformanceTimer*> *performance_timers;

class PerformanceTimer
{
public:
  PerformanceTimer(const std::string &s, uint64_t unit, el::Level l = el::Level::Debug): name(s), unit(unit), level(l), started(false)
  {
    ticks = epee::misc_utils::get_ns_count();
    if (!performance_timers)
    {
      MLOG(level, "PERF             ----------");
      performance_timers = new std::vector<PerformanceTimer*>();
    }
    else
    {
      PerformanceTimer *pt = performance_timers->back();
      if (!pt->started)
      {
        MLOG(pt->level, "PERF           " << std::string((performance_timers->size()-1) * 2, ' ') << "  " << pt->name);
        pt->started = true;
      }
    }
    performance_timers->push_back(this);
  }

  ~PerformanceTimer()
  {
    performance_timers->pop_back();
    ticks = epee::misc_utils::get_ns_count() - ticks;
    char s[12];
    snprintf(s, sizeof(s), "%8llu  ", (unsigned long long)ticks / (1000000000 / unit));
    MLOG(level, "PERF " << s << std::string(performance_timers->size() * 2, ' ') << "  " << name);
    if (performance_timers->empty())
    {
      delete performance_timers;
      performance_timers = NULL;
    }
  }

private:
  std::string name;
  uint64_t unit;
  el::Level level;
  uint64_t ticks;
  bool started;
};

void set_performance_timer_log_level(el::Level level);

#define PERF_TIMER_UNIT(name, unit) tools::PerformanceTimer pt_##name(#name, unit, tools::performance_timer_log_level)
#define PERF_TIMER_UNIT_L(name, unit, l) tools::PerformanceTimer pt_##name(#name, unit, l)
#define PERF_TIMER(name) PERF_TIMER_UNIT(name, 1000)
#define PERF_TIMER_L(name, l) PERF_TIMER_UNIT_L(name, 1000, l)
#define PERF_TIMER_START_UNIT(name, unit) tools::PerformanceTimer *pt_##name = new tools::PerformanceTimer(#name, unit, el::Level::Info)
#define PERF_TIMER_START(name) PERF_TIMER_START_UNIT(name, 1000)
#define PERF_TIMER_STOP(name) do { delete pt_##name; pt_##name = NULL; } while(0)

}