{% set current_route = app.request.attributes.get('_route')|default('app_home') %}
{% set current_route_params = app.request.attributes.get('_route_params')|default({}) %}
{% set current_locale = app.request.locale|default('en') %}
{% set locale_slugs = app.request.attributes.get('_locale_slugs') %}
{% set link_class = link_class|default('nav-link') %}

{% for locale in ['de', 'en', 'es'] %}
    {% set locale_params = current_route_params|merge({'_locale': locale}) %}
    {% if locale_slugs is iterable and locale_slugs[locale] is defined %}
        {% set locale_params = locale_params|merge({slug: locale_slugs[locale]}) %}
    {% endif %}
    <a class="{{ link_class }}{% if current_locale == locale %} active{% endif %}"
       href="{{ path(current_route, locale_params) }}"
       hreflang="{{ locale }}"
       lang="{{ locale }}"
       {% if current_locale == locale %}aria-current="true"{% endif %}>
        {{ locale|upper }}
    </a>
{% endfor %}