{% load brickwork_components brickwork_icons i18n %}
{% comment %}
Stat (VIZ-001/002/017): the KPI tile. Structural, consumed via {% include %}.
Stacks an overline label, a tabular-numeral value (font-variant-numeric:
tabular-nums via bw-stat__value, so a column of tiles never jitters as digits
change width; AC-BW-075) and an optional trend caption, the latter delegated
to _trend_indicator.html (VIZ-017; icvoss/django-brickwork#334) rather than
rendered inline: one implementation of the trend contract, not two.

Trend accessibility (BR-BW-TPL-007, AC-BW-073/074): whenever ``trend`` is set
the included partial ALWAYS renders a directional glyph (arrow-up /
arrow-down / minus, decorative) PLUS a visually hidden text fallback
("increased" / "decreased" / "unchanged"), so the direction never rides on
colour alone by construction, even when the caller supplies no
``trend_label``. ``trend_label``, when given, refines the accessible text
(e.g. "12% up on last month") and renders visibly beside the glyph. Colour
(success or danger ink on the trend row) is reinforcement only, never the
sole signal.

Class name (#334): the trend row now renders via _trend_indicator.html
rather than an inline copy of the same markup, so there is one
implementation of the trend contract, not two. The element carries BOTH
``bw-trend`` (_trend_indicator.html's own root class) and ``bw-stat__trend``
(this tile's original class, passed through via _trend_indicator.html's
``css_class`` seam): ``bw-stat__trend`` was documented public surface
before this extraction (docs/DESIGN.md and docs/BRANDING.md name it in
prose about the X-fg token contrast pairing, and frontend/src/components.css
styled it directly), so it is retained alongside the new name rather than
retired. Two class names on the one element is a naming question; this
extraction is only ever one implementation underneath, never two.

Required context:
  label: the metric's name (rendered in the overline voice).
  value: the metric's value, pre-formatted by the caller (tabular numerals).
Optional:
  trend ("up" | "down" | "flat"): the direction of change (VIZ-002). Any
        other value takes the flat treatment.
  trend_label (str): the visible delta text beside the glyph.
  icon (registry name): a leading flat glyph for the tile (VIZ-018).
  href: wraps the tile in an anchor (VIZ-024) which takes the interactive
        card's shadow raise. Omitted renders a plain non-interactive <div>,
        never a clickable-looking tile with no destination.
  loading (bool): renders skeleton rows instead of the content (STA-004).
  size ("sm" | "md" | "lg", default "md"): emitted as bw-stat--<value> only
        when supplied (VIZ-027).
  data (mapping of data-* name to value): consumer-owned test and lightweight
        JavaScript hooks on the tile root. Names are limited to data attributes
        (not Brickwork's own data-bw-* hooks), and values are escaped.
  sparkline (safe string, #60): pre-rendered sparkline markup (SVG/canvas),
        wrapped in a bw-stat__sparkline row below the value/trend. _stat.html
        is {% include %}d, never {% extends %}d (unlike _card.html and
        _modal.html, which expose consumer regions as named blocks): a plain
        {% include %} cannot fill a block defined in the included template,
        so a block here would be permanently empty. This follows
        _data_table.html's existing convention instead (row.cells are
        caller-supplied pre-rendered strings): the caller renders its own
        sparkline (an inline <svg> or a <canvas> a script mounts into) and
        passes the markup already marked safe, e.g.
        {% include "brickwork/components/_stat.html" with label="Revenue" value="1,234" sparkline=my_rendered_svg|safe %}.
        The caller owns escaping: brickwork does not sanitise this string
        (it is trusted markup the same way row.cells and card block-filler
        content are), so never pass user-supplied input here unescaped.
        Omitted (the default) renders nothing, matching the unfilled-block
        convention elsewhere. Ignored while loading=True (the skeleton
        stands in for the whole tile's content, sparkline included).

States: loading (skeleton rows stand in for the whole tile), and, when
  href is set, the interactive-card hover/focus-within raise (the same
  shadow-only treatment _card.html documents, never a transform); a trend
  reading carries up/down/flat sub-states.
Accessibility: a trend is never colour-only: a directional glyph
  (decorative) always pairs with visually-hidden text naming the direction
  in words ("increased"/"decreased"/"unchanged"), regardless of whether
  the caller supplies a visible trend_label. A linked tile (href) renders
  as a real anchor. Covered by axe.spec.mjs against dashboard-*.html
  (app/dashboard.html's own KPI row, its native usage) and
  sections-*.html (stats/inline-band.html, via _stat_band.html); the
  standalone loading and href states are exercised directly by
  tests/test_stat.py at the Python/string level, not a dedicated browser
  fixture.
Responsive: no breakpoint switch; no width-dependent CSS on any .bw-stat*
  selector. Size is the fixed sm/md/lg token scale, never viewport-driven;
  the surrounding grid (a dashboard's bw-stat-grid or this component's own
  bw-stat-band) owns whatever column-count responsiveness a page shows.
{% endcomment %}
{% if href %}<a class="bw-stat{% if size %} bw-stat--{{ size }}{% endif %}" href="{{ href }}"{% bw_data_attrs data "stat" %}>{% else %}<div class="bw-stat{% if size %} bw-stat--{{ size }}{% endif %}"{% bw_data_attrs data "stat" %}>{% endif %}
  {% if loading %}
    <div class="bw-skeleton bw-skeleton--text" aria-hidden="true"></div>
    <div class="bw-skeleton bw-skeleton--title" aria-hidden="true"></div>
  {% else %}
    {% if icon %}{% bw_icon icon size="md" decorative=True css_class="bw-stat__icon" %}{% endif %}
    <span class="bw-stat__label">{{ label }}</span>
    <span class="bw-stat__value">{{ value }}</span>
    {% include "brickwork/components/_trend_indicator.html" with trend=trend trend_label=trend_label css_class="bw-stat__trend" %}
    {% if sparkline %}<div class="bw-stat__sparkline">{{ sparkline }}</div>{% endif %}
  {% endif %}
{% if href %}</a>{% else %}</div>{% endif %}