#include "timer.h"

#include <loguru.hpp>

#include <iostream>

Timer::Timer() {
  Reset();
}

long long Timer::ElapsedMicroseconds() const {
  std::chrono::time_point<Clock> end = Clock::now();
  long long elapsed = elapsed_;
  if (start_.has_value()) {
    // TODO: clang-format this file.
    elapsed +=
        std::chrono::duration_cast<std::chrono::microseconds>(end - *start_)
            .count();
  }
  return elapsed;
}

long long Timer::ElapsedMicrosecondsAndReset() {
  long long elapsed = ElapsedMicroseconds();
  Reset();
  return elapsed;
}

void Timer::Reset() {
  start_ = Clock::now();
  elapsed_ = 0;
}

void Timer::ResetAndPrint(const std::string& message) {
  long long elapsed = ElapsedMicroseconds();
  long long milliseconds = elapsed / 1000;
  long long remaining = elapsed - milliseconds;
  LOG_S(INFO) << message << " took " << milliseconds << "." << remaining
              << "ms";
  Reset();
}

void Timer::Pause() {
  assert(start_.has_value());

  std::chrono::time_point<Clock> end = Clock::now();
  long long elapsed =
      std::chrono::duration_cast<std::chrono::microseconds>(end - *start_)
          .count();

  elapsed_ += elapsed;
  start_ = nullopt;
}

void Timer::Resume() {
  assert(!start_.has_value());
  start_ = Clock::now();
}