preparation time to consider non working days

gistfile1.txt

class pisol_custom_20260731{
	static $instance = null;
	public $format = 'Y/m/d';
	public $today;
	public $type;
	public $holidays;
	public $allowed_dates;
	
	static function get_instance(){
		if(self::$instance == null){
            self::$instance = new self();
        }
        return self::$instance;
	}
	
	function __construct(){
		add_filter('pisol_dtt_setting_filter_pi_order_preparation_days', [$this, 'days']);
	}
	
	function days($preparation_days){
		$this->today = current_time($this->format);
		$this->type =  pi_dtt_delivery_type::getType();
		$this->holidays = $this->getHolidays($this->type);
		$this->allowed_dates = $this->allowedDates($this->type);
		for($i = 0; $i < $preparation_days; $i++){
			$date = date($this->format, strtotime($this->today.' + '.$i.' days'));
			if($this->isHoliday($date) || $this->nonWorkingDay($date)){
				$preparation_days++;
			}
		}
		
		return $preparation_days;
	}
	
	function isHoliday($date){
        $holidays = $this->holidays;
        if(is_array($holidays) && in_array($date,$holidays)){
            return true;
        }
        return false;
    }
	
	function getHolidays($type){
        $var_name = 'pisol_dtt_'.$type.'_dd';
        $holidays = get_option($var_name, array());
        return $holidays;
    }
	
	function nonWorkingDay($date){
        $week = date('w', strtotime($date));
        $allowed_days = $this->allowed_dates;
        if(is_array($allowed_days) && in_array($week, $allowed_days)){
            return false;
        }
        return true;
    }
	
	function allowedDates($type){
        $var_name = 'pi_'.$type.'_days';
        $allowed_days = get_option($var_name, array());
        if(empty( $allowed_days )){
            return array(0,1,2,3,4,5,6);
        }else{
            return $allowed_days;
        }
    }
}

pisol_custom_20260731::get_instance();