frontend/components/prism/VolumeCard.tsx


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import type { TickerOverview } from "@/types/api";
import { fmtNumber } from "@/lib/format";

function activityLabel(ratio: number): string {
  if (ratio >= 1.5) return "elevated activity";
  if (ratio < 0.7) return "below average";
  return "normal activity";
}

export function VolumeCard({ overview }: { overview: TickerOverview }) {
  const today = overview.stats.volume;
  const avg = overview.stats.average_volume;
  if (today == null && avg == null) return null;

  const max = Math.max(today ?? 0, avg ?? 0);
  const todayPct = today != null && max > 0 ? Math.round((today / max) * 100) : 0;
  const avgPct = avg != null && max > 0 ? Math.round((avg / max) * 100) : 0;
  const ratio = today != null && avg != null && avg > 0 ? today / avg : null;

  return (
    <section className="psm-card">
      <div className="psm-card-head">
        <div>
          <div className="psm-eyebrow">Volume</div>
          <h2 className="psm-card-title">Volume</h2>
        </div>
      </div>
      <div className="psm-vol-list">
        <div className="psm-vol-row">
          <span className="psm-vol-label">Today</span>
          <div className="psm-vol-track">
            <div className="psm-vol-fill accent" style={{ width: `${todayPct}%` }} />
          </div>
          <span className="psm-vol-value">{today != null ? fmtNumber(today, 0) : "—"}</span>
        </div>
        <div className="psm-vol-row">
          <span className="psm-vol-label">30d avg</span>
          <div className="psm-vol-track">
            <div className="psm-vol-fill" style={{ width: `${avgPct}%` }} />
          </div>
          <span className="psm-vol-value">{avg != null ? fmtNumber(avg, 0) : "—"}</span>
        </div>
      </div>
      {ratio != null && (
        <p className="psm-muted-copy" style={{ marginTop: "var(--sp-3)" }}>
          {ratio >= 1 ? "▲" : "▼"} {ratio.toFixed(2)}× average · {activityLabel(ratio)}
        </p>
      )}
    </section>
  );
}