Woo + carbonfields - shipment modyfication - weight, zones and country, and class

functions.php

//carbonfields settings:
function pk_get_shipping_countries(){
//get shipping countries for defining countries for bulky products
    $woo_countries = new WC_Countries();
    $countries = $woo_countries->get_allowed_countries();
    
  
    return $countries;
}
function pk_get_shipping_zones(){
    //get shipping methods for default zone (not included in other) ZONE 0
    $worldwide = new WC_Shipping_Zone( 0 );
    $shipping_methods   = $worldwide->get_shipping_methods();    
    $listing_methods=[];
    foreach ( $shipping_methods as $id => $shipping_method ) {
        
        $listing_methods[ $id ] ="Strefa domyślna: ".$shipping_method->title;
      
    } 


    $delivery_zones = WC_Shipping_Zones::get_zones();
    
    foreach ((array) $delivery_zones as $key => $the_zone ) {
        $pk_zone = new WC_Shipping_Zone($key );
        $zone_shipping_methods   = $pk_zone->get_shipping_methods();    
        
        foreach ( $zone_shipping_methods as $id => $shipping_method ) {
        
            $listing_methods[ $id ] =$the_zone['zone_name'].": ".$shipping_method->title;
          
        } 


        // $listing_methods[ $key ] =$the_zone['zone_name'];
        
    }  
    return $listing_methods;
}
//defining carbon fields
       Field::make( 'separator', 'theme_shipping_separator_all', 'Wprowadzanie kosztów wysyłki' ),
        Field::make( 'complex', 'pk_shipping_costs_all', 'Dodaj koszty wysyłki' )
        ->set_layout( 'grid' )
        ->add_fields( array(
       
            Field::make( 'select', 'pk_shipping_methods_all','Wybierz metodę wysyłki i region' )
            ->add_options( 'pk_get_shipping_zones' ),
            Field::make( 'text', 'pk_shipping_method_above_weight_all', 'Powyżej wagi (KG)' )->set_attribute( 'type', 'number' ),
            Field::make( 'text', 'pk_shipping_method_cost_all', 'Koszt wysyłki' )->set_attribute( 'type', 'number' ),
        
        ) ),
        Field::make( 'separator', 'theme_bulky_shipping_separator', 'Ograniczenie wysyłki dużych gabarytów do krajów' ),
        Field::make( 'multiselect', 'pk_bulky_countries','Wybierz kraj z dostawą dużych gabarytów' )
        ->add_options( 'pk_get_shipping_countries' ),


//functions.php
add_filter( 'woocommerce_package_rates', 'pk_woocommerce_shipping_by_weight_and_class', 9999, 2 );
    
function pk_woocommerce_shipping_by_weight_and_class( $rates, $package ) {
    $destination = $package['destination'];
    $country     = $destination['country'];

    $shipping_class_target = 35; // shipping class ID (to find it, see screenshot below)
    $bulky_in_cart = false;
    foreach ( WC()->cart->get_cart_contents() as $key => $values ) {
      //checking if any product in cart is in BULKY CLASS
       if ( $values[ 'data' ]->get_shipping_class_id() == $shipping_class_target ) {
          $bulky_in_cart = true;
          break;
       } 
    }
 
    $all_bulky_countries = carbon_get_theme_option( 'pk_bulky_countries' );
    if($bulky_in_cart&&!in_array($country,$all_bulky_countries)){
// checking if current country is not in array_of countries where you can shipp bulky products
// if could not shipp cleare shipping rates
        $rates=false;
        wc_add_notice( __("There are no delivery methods available for large products for the selected country."), 'error' );
        
    }
    else{
        $shipping_zone = WC_Shipping_Zones::get_zone_matching_package( $package );

        $zone_id=$shipping_zone->get_zone_id();
        $all_shipping_costs = carbon_get_theme_option( 'pk_shipping_costs_all' );
        $cart_weight=WC()->cart->get_cart_contents_weight();
      
    
    
        foreach($rates as $key => $rate ) {
            
            foreach($all_shipping_costs as $all_shipping_cost){
                $weight_above=$all_shipping_cost['pk_shipping_method_above_weight_all'];
                if($cart_weight>$weight_above&&$key=="flat_rate:".$all_shipping_cost['pk_shipping_methods_all']){
                    $rates[$key]->cost =apply_filters('woocs_convert_price', $all_shipping_cost['pk_shipping_method_cost_all']  ,false);
                
                }
               
            }
        
         
        }
    }
   
    
   
    
     return $rates;
    
}
//PREVENT proceed to checkout if no shipping method
function disable_checkout_button_no_shipping() {
    $package_counts = array();
     
    // get shipping packages and their rate counts
    $packages = WC()->shipping->get_packages();
    foreach( $packages as $key => $pkg )
        $package_counts[ $key ] = count( $pkg[ 'rates' ] );
 
    // remove button if any packages are missing shipping options
    if( in_array( 0, $package_counts ) )
        remove_action( 'woocommerce_proceed_to_checkout', 'woocommerce_button_proceed_to_checkout', 20 );
}
add_action( 'woocommerce_proceed_to_checkout', 'disable_checkout_button_no_shipping', 1 );




function prevent_checkout_access_no_shipping() {
    // Check that WC is enabled and loaded
    if( function_exists( 'is_checkout' ) && is_checkout() ) {
     
        // get shipping packages and their rate counts
        $packages = WC()->cart->get_shipping_packages();
        foreach( $packages as $key => $pkg ) {
            $calculate_shipping = WC()->shipping->calculate_shipping_for_package( $pkg );
            if( empty( $calculate_shipping['rates'] ) ) {
                wp_redirect( esc_url( WC()->cart->get_cart_url() ) );
                exit;
            }
        }
    }
}
add_action( 'wp', 'prevent_checkout_access_no_shipping' );