{% comment %}
  Language switcher for translated docs pages.
  Renders a dropdown-style link list showing available translations of the current page.
  Include this in any page or layout that should offer locale switching.

  Usage: {% include language_switcher.html %}

  Logic:
  - Derives the current page's relative path within its section
  - Checks if translated versions exist in locale subdirectories
  - Shows a globe icon with available locale links
{% endcomment %}

{% assign current_path = page.path %}
{% assign locales = site.data.locales %}

{% if locales and current_path %}
{% assign path_parts = current_path | split: "/" %}
{% assign first_segment = path_parts[0] %}

{% comment %} Build the list of available translations first {% endcomment %}
{% assign has_translations = false %}

{% if locales[first_segment] %}
  {% comment %} We're on a translated page — English link is always available {% endcomment %}
  {% assign has_translations = true %}
  {% assign remaining_parts = path_parts | slice: 1, path_parts.size %}
  {% assign en_path = remaining_parts | join: "/" | replace: ".md", "" %}
{% else %}
  {% comment %} Check if any translated version exists {% endcomment %}
  {% assign en_relative = current_path | replace: ".md", "" %}
  {% for locale in locales %}
    {% assign locale_code = locale[0] %}
    {% assign locale_file = locale_code | append: "/" | append: en_relative | append: ".md" %}
    {% for p in site.pages %}
      {% if p.path == locale_file %}
        {% assign has_translations = true %}
        {% break %}
      {% endif %}
    {% endfor %}
    {% if has_translations %}{% break %}{% endif %}
  {% endfor %}
{% endif %}

{% if has_translations %}
<details class="language-switcher" aria-label="Language options">
  <summary class="language-switcher-btn" title="View in another language">
    🌐 <span class="lang-current">English</span>
  </summary>
  <ul class="language-switcher-list">
    {% if locales[first_segment] %}
      <li><a href="{{ en_path | relative_url }}" lang="en">English</a></li>
    {% endif %}

    {% for locale in locales %}
      {% assign locale_code = locale[0] %}
      {% assign locale_info = locale[1] %}

      {% if locales[first_segment] %}
        {% if locale_code == first_segment %}
          {% continue %}
        {% endif %}
        {% assign locale_path = locale_code | append: "/" | append: en_path %}
      {% else %}
        {% assign locale_path = locale_code | append: "/" | append: en_relative %}
      {% endif %}

      {% assign locale_file = locale_path | append: ".md" %}
      {% assign page_exists = false %}
      {% for p in site.pages %}
        {% if p.path == locale_file %}
          {% assign page_exists = true %}
          {% break %}
        {% endif %}
      {% endfor %}

      {% if page_exists %}
        <li><a href="{{ locale_path | relative_url }}" lang="{{ locale_code }}" {% if locale_info.dir == "rtl" %}dir="rtl"{% endif %}>{{ locale_info.name }}</a></li>
      {% endif %}
    {% endfor %}
  </ul>
</details>
{% endif %}
{% endif %}