public static function by_date($timestamp)
{
if (!is_numeric($timestamp)) {
throw new InvalidArgumentException("Season::by_date expects a timestamp as parameter");
}
$seasons = Season::all();
$seasons = array_filter($seasons, function ($season) use($timestamp) {
$start = strtotime(get_post($season->first_episode()->post_id)->post_date);
$end = strtotime(get_post($season->last_episode()->post_id)->post_date);
return $start <= $timestamp && ($end >= $timestamp || $season->is_running());
});
if (count($seasons) > 0) {
return reset($seasons);
} else {
return null;
}
}
