<div>
    {% set defaultValues = null %}
    {% if product.productDefaultVariant %}
        {% set defaultValues = product.productDefaultVariant.variantValues %}
    {% endif %}
    {% for group in groups %}
        {% if group.type == 'DROPDOWN' %}
            {{ render(controller('App\\Controller\\Shop\\VariantController::renderDropdown', {
                variant: group.variant,
                variantValues: group.children,
                defaultValues: defaultValues
            })) }}
        {% elseif group.type == 'SWITCHER' %}
            {{ render(controller('App\\Controller\\Shop\\VariantController::renderSwitcher', {
                variant: group.variant,
                variantValues: group.children,
                defaultValues: defaultValues
            })) }}
        {% elseif group.type == 'COLOR' %}
            {{ render(controller('App\\Controller\\Shop\\VariantController::renderColor', {
                variant: group.variant,
                variantValues: group.children,
                defaultValues: defaultValues
            })) }}
        {% else %}
            <div style="color: red">! Wrong group variant name.</div>
        {% endif %}
    {% endfor %}
</div>