wcfm-appintment-booking-based-on-vacation

add_filter('wc_appointments_find_scheduled_day_slots', function($args, $product) {
    $vendor_id = wcfm_get_vendor_id_by_post($product->get_id());
    if(!$vendor_id) return $args;
    $vendor_data = get_user_meta( $vendor_id, 'wcfmmp_profile_settings', true );
    $vacation_mode = isset( $vendor_data['wcfm_vacation_mode'] ) ? $vendor_data['wcfm_vacation_mode'] : 'no';
    $wcfm_vacation_mode_type = isset( $vendor_data['wcfm_vacation_mode_type'] ) ? $vendor_data['wcfm_vacation_mode_type'] : 'instant';
    $wcfm_vacation_start_date = isset( $vendor_data['wcfm_vacation_start_date'] ) ? $vendor_data['wcfm_vacation_start_date'] : '';
    $wcfm_vacation_end_date = isset( $vendor_data['wcfm_vacation_end_date'] ) ? $vendor_data['wcfm_vacation_end_date'] : '';
    if ( $vacation_mode == 'yes' ) {
        if( $wcfm_vacation_mode_type == 'instant' ) {
            $vacation_arg = array(
                'type' => 'days',
                'range' => array(
                    '1' => false,
                    '2' => false,
                    '3' => false,
                    '4' => false,
                    '5' => false,
                    '6' => false,
                    '7' => false
                ),
            );
        } elseif( $wcfm_vacation_start_date && $wcfm_vacation_end_date ) {
            $start_time = strtotime( $wcfm_vacation_start_date );
            $end_time = strtotime( $wcfm_vacation_end_date );
            $y = date("Y", $end_time);
            $m = date("m", $end_time);
            $d = date("d", $end_time);
            $range = array();
            while($start_time < $end_time) {
                $year = date("Y", $start_time);
                if(!isset($range[$year])) {
                    $range[$year] = array();
                }
                $mon = date("n", $start_time);
                if(!isset($range[$year][$mon])) {
                    $range[$year][$mon] = array();
                }
                $date = date("j", $start_time);
                if($y > $year || $m > $mon) {
                    $month_days = date("t", $start_time);
                    $range[$year][$mon] = array_fill($date, $month_days - $date + 1, false);
                    $start_time = strtotime("+1 day", strtotime("{$year}-{$mon}-{$month_days}"));
                } else {
                    $range[$year][$mon] = array_fill($date+0, $d - $date + 1, '');
                    $start_time = $end_time;
                }
            }
            $vacation_arg = array(
                'type' => 'custom',
                'range' => $range,
            );
        }
        if(isset($args['availability_rules'])) {
            $args['availability_rules'][] = array_merge(
                $vacation_arg,
                array(
                    'priority' => 1,
                    'qty' => 0,
                    'level' => 'product',
                    'order' => 0,
                    'kind_id' => $product->get_id(),
                ),
            );
        }
    }
    return $args;
}, 10, 2);