{% load brickwork_icons i18n %}
{% comment %}
Pagination controls. Renders nothing when there is only one page, or when
page_obj is absent (STA-014: a one-page result shows no controls). Uses
logical prev/next (chevron-back/-forward flip under RTL, ICO-014). Preserves
the current sort and filter params so they survive a page change.

TBL-004 (icvoss/django-brickwork#217): page_obj accepts either a real
django.core.paginator.Page, or any duck-typed object presenting the same
attributes FLAT: number, num_pages, has_previous, has_next,
previous_page_number, next_page_number. num_pages is read either nested
(page_obj.paginator.num_pages, the Page shape) or flat (page_obj.num_pages,
the duck-typed shape); every other attribute is already flat on both shapes.
The one-page/absent-page_obj render-nothing contract above is unchanged for
either shape. The `page_param` rename ask from #217 is deferred by recorded
issue-comment ruling: this component does not add it.

#41: when ``request`` is in context (the view/pattern path) the built-in
``{% querystring %}`` tag overrides only ``page`` and keeps every other current
GET param (sort, filters), so the pattern owns the sort/pagination split with no
consumer-supplied ``querystring``. Standalone renders with no request fall back
to the documented ``querystring`` var (the current GET minus ``page``), so the
component's request-free render contract is unchanged.

Required context: page_obj (a Page, or a flat duck-typed equivalent, see
above). Optional: querystring (the request-free fallback: the current GET
params minus 'page').
{% endcomment %}
{% if page_obj.paginator.num_pages > 1 or page_obj.num_pages > 1 %}
<nav class="bw-pagination" aria-label="{% translate 'Pagination' %}">
  {% if page_obj.has_previous %}
    <a class="bw-pagination__link" href="{% if request %}{% querystring page=page_obj.previous_page_number %}{% else %}?page={{ page_obj.previous_page_number }}{% if querystring %}&{{ querystring }}{% endif %}{% endif %}"
       aria-label="{% translate 'Previous page' %}" rel="prev">
      {% bw_icon "chevron-back" size="sm" decorative=True %}
    </a>
  {% else %}
    <span class="bw-pagination__link bw-pagination__link--disabled" aria-disabled="true">
      {% bw_icon "chevron-back" size="sm" decorative=True %}
    </span>
  {% endif %}

  <span class="bw-pagination__status">
    {% firstof page_obj.paginator.num_pages page_obj.num_pages as bw_total_pages %}
    {% blocktranslate with current=page_obj.number total=bw_total_pages %}Page {{ current }} of {{ total }}{% endblocktranslate %}
  </span>

  {% if page_obj.has_next %}
    <a class="bw-pagination__link" href="{% if request %}{% querystring page=page_obj.next_page_number %}{% else %}?page={{ page_obj.next_page_number }}{% if querystring %}&{{ querystring }}{% endif %}{% endif %}"
       aria-label="{% translate 'Next page' %}" rel="next">
      {% bw_icon "chevron-forward" size="sm" decorative=True %}
    </a>
  {% else %}
    <span class="bw-pagination__link bw-pagination__link--disabled" aria-disabled="true">
      {% bw_icon "chevron-forward" size="sm" decorative=True %}
    </span>
  {% endif %}
</nav>
{% endif %}