Taiga EstimateLastAiredEpisodeNumber.cpp

int EstimateLastAiredEpisodeNumber(const Item& item) {
  // Can't estimate for other types of anime
  if (item.GetType() != kTv)
    return 0;

  // TV series air weekly, so the number of weeks that has passed since the day
  // the series started airing gives us the last aired episode. Note that
  // irregularities such as broadcasts being postponed due to sports events make
  // this method unreliable.
  const Date& date_start = item.GetDateStart();
  if (date_start.year() && date_start.month() && date_start.day()) {
    // To compensate for the fact that we don't know the airing hour,
    // we substract one more day.
    int date_diff = GetDateJapan() - date_start - 1;
    if (date_diff > -1) {
      const int episode_count = item.GetEpisodeCount();
      const int number_of_weeks = date_diff / 7;
      if (!IsValidEpisodeCount(episode_count) ||
          number_of_weeks < episode_count) {
        return number_of_weeks + 1;
      } else {
        return episode_count;
      }
    }
  }

  return 0;
}