{% block navigation %}
  <nav>
    <ul>
      {% for title, mapping in bag("navigation").items() %}
        {% if mapping.visible|default(true) %}
          {% if not mapping.list_childs %}
          <li>
            <a
              {% if this._path == mapping.href %} class="active"
              {% endif %} {{- ' ' -}}
              href="{{ mapping.href|url }}">
                {{- title -}}
            </a>
          {% else %}
          <li>
              {{ title }}
            <ul>
            {% set sub_menu = mapping['items'].items() %}
            {% for sub_title, href in sub_menu %}
              {% if sub_title != "list_namespace" %}
                <li>
                  <a
                  {% if this._path == href %}
                    {{- ' class="active"' }}
                  {% endif %} {{- ' ' -}}
                  href="{{ href }}">
                    {{- sub_title -}}
                  </a>
                </li>
              {% else %}
                {% set children = site.get(href).children %}
                {% for child in children %}
                  {% if loop.index <= 3 %}
                    <li>
                      <a
                        {% if this._path + '/' == child.url_path %}
                          {{- ' class="active"' -}}
                        {% endif %} {{- ' ' -}}
                        href="{{ child.url_path }}">
                        {{- child.title -}}
                      </a>
                    </li>
                  {% endif %}
                {% endfor %}
              {% endif %}
            {% endfor %}
            </ul>
          {% endif %}
          </li>
        {% endif %}
      {% endfor %}
    </ul>
  </nav>
{% endblock %}