{#
/**
 * @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.
 */
#}

{{ attach_library('localgov_microsites_base/menu') }}

{% import _self as menus %}

{#
  We call a macro which calls itself to render the full tree.
  @see https://twig.symfony.com/doc/1.x/tags/macro.html
#}
{{ menus.menu_links(items, attributes, 0, menu_name, '') }}

{% macro menu_links(items, attributes, menu_level, menu_name) %}
  {% import _self as menus %}
    {#
      We will use this random id later for setting aria attributes for what button
      controls which sub-menu.
    #}
    {% set random = random(1000) %}

    {% set sub_menu_attributes = create_attribute() %}
    {% set sub_item_attributes = create_attribute() %}

    {%
      set menu_classes = [
        'menu',
        'menu--' ~ menu_name,
        'menu--menu-level-' ~ menu_level,
      ]
    %}

    {%
      set sub_menu_classes = [
        'menu',
        'menu--sub-menu',
        'menu--sub-menu-level-' ~ menu_level,
        'menu-' ~ menu_name ~ '--sub-menu',
      ]
    %}

  {% if items %}
    {% if menu_level == 0 %}
      <ul{{ attributes.addClass(menu_classes).setAttribute('id', 'menu--' ~ random) }}>
    {% else %}
      <ul{{ sub_menu_attributes.addClass(sub_menu_classes).setAttribute('id', 'menu--' ~ random) }}>
    {% endif %}
    {% for item in items %}
      {%
        set classes = [
          'menu-item',
          'menu-item--level-' ~ menu_level,
          item.is_expanded ? 'menu-item--expanded',
          item.is_collapsed ? 'menu-item--collapsed',
          item.in_active_trail ? 'menu-item--active-trail',
        ]
      %}
      <li{{ item.attributes.addClass(classes).setAttribute('data-index', loop.index).setAttribute('data-level', menu_level) }}>
        {{ link(item.title, item.url) }}
        {% if item.below %}
          <button id="{{ 'menu__sub-menu-toggle--' ~ random }}" data-id="{{ random }}" class="menu__sub-menu-toggle" aria-label="{{ 'Toggles '|t }}{{item.title}}{{' submenu'|t }}" aria-expanded="false" hidden>
            <span class="menu__sub-menu-toggle-icon"></span>
          </button>
          {{ menus.menu_links(item.below, attributes, menu_level + 1) }}
        {% endif %}
      </li>
    {% endfor %}
    </ul>
  {% endif %}
{% endmacro %}
