woocommerce detailed product page

Hello!
I have site with woocommerce and have part of code in hooks.php and it give an error
$cat = get_the_terms($product->ID, ‘product_cat’);

Notice: Undefined variable: product in?/home/suunto-ukraine.com/www/wp-content/themes/suunto/inc/functions/hooks.php?on line?181

Notice: Trying to get property ‘ID’ of non-object in?/home/suunto-ukraine.com/www/wp-content/themes/suunto/inc/functions/hooks.php?on line?181
global $product; – not resolve the problem
Can anybody help me, pleasure?
full code:
function woocommerce_add_custom_text_before_product_title()
{

echo '<div class="hero-product__block">'; ?>
<?php
$terms = get_field('terms_select');

if ($terms): ?>
    <ul class="product__tags">
        <?php foreach ($terms as $term): $term_link = get_term_link($term); ?>
            <li>
                <?php
                echo '<a href="';
                echo $term_link;
                echo '"';
                echo ' style="background-color:';
                echo get_field('tag_color', $term);
                echo '">';
                echo $term->name;
                echo '</a></li>';

                ?>
            </li>
        <?php endforeach; ?>
    </ul>
<?php endif; ?>


<?php
echo '</div>';
$cat = get_the_terms($product->ID, 'product_cat');
foreach ($cat as $categoria) {
    if ($categoria->parent == 0) {
        echo '<h4 class="parrent_cat">';
        echo $categoria->name;
        echo '</h4>';
    }
}
the_title('<h1 class="product_title entry-title">', '</h1>');

Expand

}

add_action(‘woocommerce_single_product_summary’, ‘woocommerce_add_custom_text_before_product_title’, 5);