{#
  Custom navbar-nav.html for pytorch_sphinx_theme2
  Renders toctree items as dropdowns showing their subsections.

  This template overrides pydata_sphinx_theme's navbar-nav.html to display
  top-level navigation items with dropdown menus containing their children.

  Pure CSS/Jinja implementation - no JavaScript required.
  Uses the `hierarchical_header_nav` context variable populated by __init__.py

  Uses theme_header_links_before_dropdown to control how many items show before "More".
  Uses theme_enable_navbar_dropdowns to enable/disable dropdown menus (default: true).

  Mobile: Dropdowns are collapsed by default, parent link is clickable,
          toggle button expands/collapses children.

  Supports external URLs (http://, https://) in toctree entries.
#}

{% set max_visible_items = theme_header_links_before_dropdown|default(4)|int %}
{% set dropdowns_enabled = theme_enable_navbar_dropdowns|default('true')|lower == 'true' %}

{# Macro to generate the correct href for internal or external links #}
{% macro item_href(item) %}
  {%- if item.external -%}
    {{ item.url }}
  {%- else -%}
    {{ pathto(item.url) }}
  {%- endif -%}
{% endmacro %}

{# Macro to generate link attributes for external links #}
{% macro external_attrs(item) %}
  {%- if item.external %} target="_blank" rel="noopener noreferrer"{% endif -%}
{% endmacro %}

{# Macro to generate external link icon #}
{% macro external_icon(item) %}
  {%- if item.external -%}&nbsp;<i class="fa-solid fa-arrow-up-right-from-square external-icon"></i>{%- endif -%}
{% endmacro %}

{% if hierarchical_header_nav %}
<nav>
  <ul class="bd-navbar-elements navbar-nav">
    {# Show first N items with dropdown support (if enabled) #}
    {% for item in hierarchical_header_nav[:max_visible_items] %}
      <li class="nav-item{% if dropdowns_enabled and item.children %} dropdown{% endif %}{% if item.current %} current active{% endif %}">
        {% if dropdowns_enabled and item.children %}
          {# Dropdown menu for items with children #}
          <div class="nav-item-with-toggle">
            <a class="nav-link{% if not item.external %} nav-internal{% endif %}{% if item.current %} active{% endif %}" href="{{ item_href(item) }}"{{ external_attrs(item) }}>
              {{ item.title }}{{ external_icon(item) }}
            </a>
          </div>
          <ul class="dropdown-menu" id="dropdown-{{ loop.index }}">
            {% for child in item.children %}
              <li class=" ">
                <a class="nav-link dropdown-item nav-internal" href="{{ pathto(child.url) }}">
                  {{ child.title }}
                </a>
              </li>
            {% endfor %}
          </ul>
        {% else %}
          {# Simple link for items without children or dropdowns disabled #}
          <a class="nav-link{% if not item.external %} nav-internal{% endif %}{% if item.current %} active{% endif %}" href="{{ item_href(item) }}"{{ external_attrs(item) }}>
            {{ item.title }}{{ external_icon(item) }}
          </a>
        {% endif %}
      </li>
    {% endfor %}

    {# "More" dropdown for remaining items - uses CSS hover like other dropdowns #}
    {% if hierarchical_header_nav|length > max_visible_items %}
      <li class="nav-item dropdown more-dropdown">
        <div class="nav-item-with-toggle">
          <span class="nav-link more-toggle" tabindex="0" role="button" aria-expanded="false" aria-controls="pst-nav-more-links">
            More
          </span>
        </div>
        <ul id="pst-nav-more-links" class="dropdown-menu">
          {% for item in hierarchical_header_nav[max_visible_items:] %}
            <li class="{{ 'current active' if item.current else '' }}">
              <a class="nav-link dropdown-item{% if not item.external %} nav-internal{% endif %}" href="{{ item_href(item) }}"{{ external_attrs(item) }}>
                {{ item.title }}{{ external_icon(item) }}
              </a>
            </li>
          {% endfor %}
        </ul>
      </li>
    {% endif %}
  </ul>
</nav>
{% else %}
{# Fallback: use the default header navigation if hierarchical nav is empty #}
{{ generate_header_nav_html()|safe }}
{% endif %}