Add product programmatically to cart based on cart total

This product can cost zero and so make it a gift

          

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          function maybe_handle_gift_product() {
    $gift_product_id = 3444;
    $threshold = 60;
    $cart = WC()->cart;

    if ( is_admin() || ! $cart ) return;

    $cart_total = $cart->get_subtotal() + $cart->get_discount_total();

    $gift_in_cart = false;
    $gift_key = '';

    foreach ( $cart->get_cart() as $key => $item ) {
        if ( $item['product_id'] == $gift_product_id ) {
            $gift_in_cart = true;
            $gift_key = $key;
            break;
        }
    }

    if ( $cart_total >= $threshold ) {
        if ( ! $gift_in_cart ) {
            $cart->add_to_cart( $gift_product_id, 1, 0, [], [ 'is_auto_gift' => true ] );
        }
    } else {
        if ( $gift_in_cart ) {
            $cart->remove_cart_item( $gift_key );
        }
    }
}
add_action( 'woocommerce_cart_updated', 'maybe_handle_gift_product' );


function prevent_manual_gift_product_addition( $passed, $product_id, $quantity, $variation_id = null, $variations = null, $cart_item_data = [] ) {
    if ( $product_id == 3444 && empty( $cart_item_data['is_auto_gift'] ) ) {
        wc_add_notice( 'Αυτό το προϊόν δεν μπορεί να προστεθεί στο καλάθι χειροκίνητα.', 'error' );
        return false;
    }
    return $passed;
}
add_filter( 'woocommerce_add_to_cart_validation', 'prevent_manual_gift_product_addition', 10, 6 );
          

            
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