Exclude the disabled weekdays and season with 100% discount from number of selected days

functions.php

<?php

function bkap_selected_number_of_nights( $number, $checkin_date, $checkout_date, $product_id, $booking_settings ) {

	$dates    = bkap_common::bkap_get_betweendays( $checkin_date, $checkout_date, 'Y-m-d' );
	foreach ( $dates as $date ) {
		$day          = date( 'w', strtotime( $date ) );
		$weekday_name = 'booking_weekday_' . $day;

		if ( '' === $booking_settings['booking_recurring'][$weekday_name] ) {
			$number = $number - 1;
		}
	}
	$number = bkap_selected_number_of_nights_seasonal( $number, $checkin_date, $checkout_date, $product_id, $booking_settings );
	return $number;
}
add_filter( 'bkap_selected_number_of_nights', 'bkap_selected_number_of_nights', 10, 5 );

function bkap_consider_date_for_season( $consider, $date_value, $product_id, $booking_settings ) {

	$day          = gmdate( 'w', strtotime( $date_value ) );
	$weekday_name = 'booking_weekday_' . $day;
	if ( '' === $booking_settings['booking_recurring'][ $weekday_name ] ) {
		return false;
	}
	return $consider;
}
add_filter( 'bkap_consider_date_for_season', 'bkap_consider_date_for_season', 10, 4 );

function bkap_selected_number_of_nights_seasonal( $number, $checkin_date, $checkout_date, $product_id, $booking_settings ) {

	global $wpdb;
	if ( isset( $booking_settings['booking_seasonal_pricing_enable'] ) && 'yes' === $booking_settings['booking_seasonal_pricing_enable'] ) {

		if ( is_plugin_active( 'bkap-rental/rental.php' ) && isset( $booking_settings['booking_charge_per_day'] ) && $booking_settings['booking_charge_per_day'] == 'on' ) {
			$bkap_date_range = bkap_common::bkap_get_betweendays_when_flat( $checkin_date, $checkout_date, $product_id, 'Y-m-d' );
		} else {
			$bkap_date_range = bkap_common::bkap_get_betweendays( $checkin_date, $checkout_date, 'Y-m-d' );
		}

		$query   = 'SELECT * FROM `' . $wpdb->prefix . "booking_seasonal_pricing` WHERE post_id = '" . $product_id . "'";
		$results = $wpdb->get_results( $query );

		$current_user = wp_get_current_user();
		$roles        = $current_user->roles;
		$role         = array_shift( $roles );

		foreach ( $bkap_date_range as $date_key => $date_value ) {

			foreach ( $results as $key => $val ) {
				$season_start_date = $val->start_date;
				$season_end_date   = $val->end_date;
				$user_roles        = json_decode( $val->user_role );

				if ( $user_roles == '' || in_array( 'all', $user_roles, true ) || in_array( $role, $user_roles ) ) {
					if ( $date_value >= $season_start_date && $date_value <= $season_end_date ) {
						if ( 'percent' === $val->amount_or_percent && 'subtract' === $val->operator && '100' == $val->price ) {
							$number = $number - 1;
						}
					}
				}
			}
		}
	}

	return $number;
}