customer-group-category-visibility.php

<?php
/*
Plugin Name: BC4WP > Customer Group Category Visibility
Description: Example plugin to hide BC categories based on customer group access
Author: BigCommerce
Version: 0.5
*/

// Set to -1 to not set a default customer group for visibility
// (using 0 will pull in the first customer group from BC)
const DEFAULT_CUSTOMER_GROUP_ID = 6;

function set_default_customer_group($group, $customer) {
	if ($customer->get_customer_id() === 0) {
		return DEFAULT_CUSTOMER_GROUP_ID;
	}
}

add_filter('bigcommerce/customer/group_id', 'set_default_customer_group', 10, 2);

function filter_categories_based_on_customer_group($sorted_menu_items, $args) {
	// https://developer.wordpress.org/reference/functions/get_current_user_id/	
	$current_user_id = get_current_user_id();
	
	$customer = new \BigCommerce\Accounts\Customer($current_user_id);
    try {
	  $customer_group_info = $customer->get_group()->get_info();
	} catch ( \Exception $e ) {
	  wp_die( $e->getMessage() );
	}
	
	return array_filter($sorted_menu_items, function($item) use ($current_user_id, $customer_group_info) {
		if ($item->object === 'bigcommerce_category') {
			// https://developer.wordpress.org/reference/functions/get_term_meta
			$category_meta = get_term_meta($item->object_id);
			$bigcommerce_category_id = $category_meta['bigcommerce_id'][0];

			// Only show this category if one of the two conditions apply:
			// 1) The customer group category is blank (is the default fallback)
			// or
			// 2a) The customer group category access type is set to 'all'
			// 2b) The customer group category access type is set to 'specific' and the category is within the categories array
			return empty($customer_group_info['category_access']) || ($customer_group_info['category_access']['type'] && ($customer_group_info['category_access']['type'] === 'all' || ($customer_group_info['category_access']['type'] === 'specific' && in_array($bigcommerce_category_id, $customer_group_info['category_access']['categories']))));
		}

		// For all other types of menu items, pass them through so they display normally.
		return true;
	});
}

add_filter('wp_nav_menu_objects', 'filter_categories_based_on_customer_group', 10, 2);