{#
/**
 * @file
 * Theme override to display a menu.
 *
 * Available variables:
 * - menu_name: The machine name of the menu.
 * - items: A nested list of menu items. Each menu item contains:
 *   - attributes: HTML attributes for the menu item.
 *   - below: The menu item child items.
 *   - title: The menu link title.
 *   - url: The menu link url, instance of \Drupal\Core\Url
 *   - localized_options: Menu link localized options.
 *   - is_expanded: TRUE if the link has visible children within the current
 *     menu tree.
 *   - is_collapsed: TRUE if the link has children within the current menu tree
 *     that are not currently visible.
 *   - in_active_trail: TRUE if the link is in the active trail.
 */
#}
{% import _self as menus %}
{#
We call a macro which calls itself to render the full tree.
@see http://twig.sensiolabs.org/doc/tags/macro.html
#}
{{ menus.build_menu(items, attributes, 0) }}

{% macro build_menu(items, attributes, menu_level) %}
  {% import _self as menus %}
  {% if items %}
    {% if menu_level == 0 %}
    <ul{{ attributes.addClass('navbar-nav mr-auto') }}>
    {% else %}
    <ul class="dropdown-menu">
    {% endif %}
    {% for item in items %}
      {{ menus.add_link(item, attributes, menu_level) }}
    {% endfor %}
    </ul>
  {% endif %}
{% endmacro %}

{% macro add_link(item, attributes, menu_level) %}
  {% import _self as menus %}
  {%
    set list_item_classes = [
    'nav-item',
    item.is_expanded ? 'dropdown',
    (item.is_expanded and menu_level == 1) ? 'dropdown-submenu'
  ]
  %}
  {%
    set link_class = [
      menu_level == 0 ? 'nav-item',
      menu_level == 0 ? 'nav-link',
      item.in_active_trail ? 'active',
      menu_level == 0 and (item.is_expanded or item.is_collapsed) ? 'dropdown-toggle',
      menu_level > 0 ? 'dropdown-item',
    ( item.below and menu_level == 2 ) ? 'dropdown-menu',
    ]
  %}
  {%
    set toggle_class = [
  ]
  %}
  <li{{ item.attributes.addClass(list_item_classes) }}>
    {% if menu_level <= 2 and item.below %}
      {{ link(item.title, item.url, { 'class': link_class, 'role': 'button', 'data-bs-toggle': (menu_level == 1 ? '' : 'dropdown'), 'aria-expanded': 'false', 'title': ('Expand menu' | t) ~ ' ' ~ item.title }) }}
      {{ menus.build_menu(item.below, attributes, menu_level + 1) }}
    {% else %}
      {{ link(item.title, item.url, { 'class': link_class }) }}
    {% endif %}
  </li>
{% endmacro %}
