{#- chirp-ui: ASCII Sparkline
    Inline data visualization using Unicode block characters.

    Usage:
        from "chirpui/ascii_sparkline.html" import ascii_sparkline

        ascii_sparkline(values=[1, 3, 5, 7, 4, 2, 6])
        ascii_sparkline(values=[2, 8, 4, 6], variant="accent")
        ascii_sparkline(values=[1, 2, 3, 4, 5, 6, 7, 8], variant="gradient")

    Values are normalized to 1-8 range automatically.
-#}

{% set BARS = ["▁", "▂", "▃", "▄", "▅", "▆", "▇", "█"] %}

{% def ascii_sparkline(values=[], variant="", cls="") %}
{% set variant = variant | validate_variant(("", "default", "accent", "muted", "gradient"), "") %}
{% set variant_class = " chirpui-ascii-sparkline--" ~ variant if variant else "" %}
{% set vmin = values | min if values else 0 %}
{% set vmax = values | max if values else 1 %}
{% set vrange = vmax - vmin if vmax != vmin else 1 %}
<span class="chirpui-ascii-sparkline{{ variant_class }}{{ " " ~ cls if cls else "" }}"
      role="img"
      aria-label="Sparkline: {{ values | join(', ') }}">
    {%- for v in values -%}
        {%- set idx = (((v - vmin) / vrange) * 7) | int -%}
        <span class="chirpui-ascii-sparkline__bar">{{ BARS[idx] }}</span>
    {%- end -%}
</span>
{% end %}