Aplicar gastos de envío gratuito a nivel de producto o categoría de producto

advanced-free-shipping-only-one-single-product

/* Only one single product may be in the cart */

add_action( 'wafs_match_condition_single_product', 'wafs_match_condition_single_product', 10, 3 );

/* Match single category
 *
 * @param bool $match
 * @param string $operator
 * @param mixed $value
 * @return bool
 */
function wafs_match_condition_single_product( $match, $operator, $value ) {

    global $woocommerce;
    
    $match = true;      
    if ( ! isset( $woocommerce->cart ) || empty( $woocommerce->cart->cart_contents ) ) return;
    

    if ( '==' == $operator ) :
    
        foreach ( $woocommerce->cart->cart_contents as $product ) :
            if ( $product['product_id'] != $value ) :
                $match = false;
            endif;
        endforeach;
        
    elseif ( '!=' == $operator ) :
        
        foreach ( $woocommerce->cart->cart_contents as $product ) :
            if ( $product['product_id'] == $value ) :
                $match = false;
            endif;
        endforeach;
        
    endif;
        
    return $match;

}

add_filter( 'wafs_conditions', 'wafs_conditions_add_single_product', 10, 1 );
function wafs_conditions_add_single_product( $conditions ) {
    
    $conditions['Product']['single_product'] = 'Only product in cart';
    
    return $conditions;
    
}

add_filter( 'wafs_values', 'wafs_values_add_single_product', 10, 2 );
function wafs_values_add_single_product( $values, $condition ) {
    
    switch ( $condition ) {

        case 'single_product':
        
            $values['field'] = 'select';

            $products = get_posts( array( 'posts_per_page' => '-1', 'post_type' => 'product', 'order' => 'asc', 'orderby' => 'title' ) );
            foreach ( $products as $product ) :
                $values['options'][$product->ID ] = $product->post_title;
            endforeach;


        break;
    
    }
    
    return $values;
    
}