Shortcode to display a minimum order total required message to users in a specific user role on checkout page when using Woocommerce

shortcodes.php

<?php

/*
Author: Doug Edgington
Description: Shortcode to display a minimum order total required message to 
users in a specific user role on checkout page when using Woocommerce
*/

function dee_minimum_order_total_message() {
		
	if( is_user_logged_in() ) { 

		global $woocommerce;
		global $current_user;
			
		get_currentuserinfo();
			
		$dee_user_roles = $current_user->roles;
		$dee_user_role = array_shift($dee_user_roles);
			
		$dee_minimum = 50;
		if ( $woocommerce->cart->subtotal < $dee_minimum  && $dee_user_role == 'wholesale_buyer') {
				return( sprintf( '<span class="min-wholesale-message">Wholesale users must have a minimum order total of $%s to place an order.</span>' , $dee_minimum ) );
			}
	} //end main if statement
}
add_shortcode('minimum-required', 'dee_minimum_order_total_message');

?>

Thank you so much for this, Doug! This is exactly what I was looking for! I have one question:

I sell bottles and cases of salsa, and want to restrict Wholesale Buyers from purchasing individual bottles. Would it be possible for you to show me how to check if a bottle (by variation ID) is in the cart, and if its a Wholesale Buyer, to display an error message stating they can only purchase cases? Thanks again!