// Yoast: po WP All Importu nastavi najglobljo product_cat kot primarno
add_action('pmxi_saved_post', function ($post_id) {
    if (get_post_type($post_id) !== 'product') return;

    $terms = wp_get_post_terms($post_id, 'product_cat', ['fields' => 'all']);
    if (empty($terms) || is_wp_error($terms)) return;

    // izberi najglobljo kategorijo (največ prednikov)
    $deepest = null; $max_depth = -1;
    foreach ($terms as $t) {
        $depth = count(get_ancestors($t->term_id, 'product_cat'));
        if ($depth > $max_depth) { $max_depth = $depth; $deepest = $t; }
    }
    if (!$deepest) return;

    // YOAST primary
    update_post_meta($post_id, '_yoast_wpseo_primary_product_cat', $deepest->term_id);
}, 20);