Live-Diagramm

'use client';

import { useEffect, useId, useRef, useState } from 'react';
import { cn, prefersReducedMotion, round, useTexts } from '@/lib/kit';
import { Icon } from '@/components/ui/icon';
import { ChartRoot, ChartSurface, ChartTable, Swatch, barPath, linePath, niceTicks, numberFormatter, textWidth, tickFormatter, useEntrance, useIntlLocale, useWidth, type ChartA11y } from '@/components/ui/chart';
import { ChartFigure, HALO, PlotAxes, linear, pairColor, type ChartFigureProps } from '@/components/ui/chart-figure';

/*
 * Values that keep coming in.
 *   line     one measure as a line that slides left, the newest point pulses
 *   bars     one bar per second, new bars grow in on the right
 *   events   single events (orders, sign ups) as dots on a running time
 *            track, the newest in a short feed below
 *   multi    several measures as small live tiles with their current value
 *   latency  a typical and a slow value (p50 and p95) as a band, a limit line
 *
 * Feed it either way: pass new `data` from your source (socket, polling)
 * and the chart slides, or set `simulate` for a demo that invents values
 * inside a band. The chart stops while the pointer or the keyboard is on it,
 * and a button pauses it for good (moving content needs a pause, WCAG
 * 2.2.2). With reduced motion the values still update, nothing slides.
 */

export type LiveVariant = 'line' | 'bars' | 'events' | 'multi' | 'latency';

export interface LiveSeries {
  label: string;
  /** Oldest first, one value per tick */
  values: number[];
  /** Range of the simulation and of the scale */
  min?: number;
  max?: number;
  format?: Intl.NumberFormatOptions;
  /** Text after the value, e.g. " %" or " ms" */
  suffix?: string;
}

export interface LiveEvent {
  label: string;
  value: number;
  /** Seconds ago */
  ago: number;
}

export interface LiveChartProps extends Omit<ChartA11y, 'label'>, ChartFigureProps {
  /** Accessible name of the chart. Default: the title. */
  label?: string;
  variant?: LiveVariant;
  /** line, bars: one series. multi: several. latency: two (typical and slow). */
  series?: LiveSeries[];
  /** events: the events so far */
  events?: LiveEvent[];
  /** events: names the simulation draws new events from, "#" becomes a running number */
  eventNames?: string[];
  /** latency: the limit line */
  limit?: number;
  limitLabel?: string;
  /** Points on screen. Default 40. */
  window?: number;
  /** Milliseconds between ticks. Default 1000. */
  interval?: number;
  /** Invent new values inside min and max (demos, previews) */
  simulate?: boolean;
  format?: Intl.NumberFormatOptions;
  className?: string;
}

const TEXTS = {
  en: { pause: 'Pause updates', play: 'Resume updates', live: 'Live', paused: 'Paused', held: 'Held while you read', ago: '{n} s ago', now: 'now', latest: 'Latest', time: 'Time', value: 'Value', event: 'Event', perSec: 'per second' },
  de: { pause: 'Aktualisierung anhalten', play: 'Aktualisierung fortsetzen', live: 'Live', paused: 'Angehalten', held: 'Angehalten, solange du liest', ago: 'vor {n} s', now: 'jetzt', latest: 'Zuletzt', time: 'Zeit', value: 'Wert', event: 'Ereignis', perSec: 'pro Sekunde' },
};

const CSS = '@keyframes kitlive-shift{from{transform:translateX(var(--kitlive-step))}}@keyframes kitlive-ping{0%{transform:scale(1);opacity:.55}100%{transform:scale(3);opacity:0}}@keyframes kitlive-in{from{opacity:0;transform:translateY(-6px)}}.kitlive-shift{animation:kitlive-shift var(--kitlive-t) linear both}.kitlive-ping{transform-box:fill-box;transform-origin:center;animation:kitlive-ping 1.6s cubic-bezier(.2,.7,.3,1) infinite}.kitlive-in{animation:kitlive-in .45s var(--ease-kit) both}@media (prefers-reduced-motion:reduce){.kitlive-shift,.kitlive-ping,.kitlive-in{animation:none!important}}';

/** The running buffers: follows new props, or invents values with simulate */
function useStream(series: LiveSeries[], window: number, interval: number, simulate: boolean, hold: boolean) {
  const [bufs, setBufs] = useState(() => series.map((s) => s.values.slice(-window)));
  const [tick, setTick] = useState(0);
  const holdRef = useRef(hold);
  holdRef.current = hold;
  // New data from outside: take it and count a tick so the line slides
  const sig = series.map((s) => s.values.length + ':' + s.values[s.values.length - 1]).join('|');
  const first = useRef(true);
  useEffect(() => {
    if (first.current) {
      first.current = false;
      return;
    }
    if (simulate) return;
    setBufs(series.map((s) => s.values.slice(-window)));
    setTick((t) => t + 1);
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [sig]);
  useEffect(() => {
    if (!simulate) return;
    const id = setInterval(() => {
      if (holdRef.current) return;
      setBufs((prev) =>
        prev.map((b, i) => {
          const s = series[i];
          const lo = s.min ?? Math.min(...s.values);
          const hi = s.max ?? Math.max(...s.values);
          const last = b[b.length - 1] ?? (lo + hi) / 2;
          const span = hi - lo || 1;
          // A walk that leans back to the middle, so it never sticks at an edge
          const pull = ((lo + hi) / 2 - last) * 0.12;
          const next = Math.max(lo, Math.min(hi, last + pull + (Math.random() - 0.5) * span * 0.22));
          return [...b.slice(-(window - 1)), round(next, 2)];
        }),
      );
      setTick((t) => t + 1);
    }, interval);
    return () => clearInterval(id);
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [simulate, interval, window]);
  return { bufs, tick };
}

/**
 * Values that keep coming in: a sliding line, growing bars, an event track, live tiles or a latency band.
 *   <LiveChart variant="line" series={[{ label: 'Visitors now', values: last40, min: 0, max: 120 }]} simulate />
 */
export function LiveChart(props: LiveChartProps) {
  const { variant = 'line', series = [], events = [], eventNames = [], limit, limitLabel, window: win = 40, interval = 1000, simulate = false, format, label, summary, labels, animate = true, title, value, delta, meta, source, framed, className } = props;
  const t = useTexts(TEXTS, undefined);
  const intl = useIntlLocale();
  const [wrapRef, width] = useWidth<HTMLDivElement>(720);
  const [rootRef, anim] = useEntrance<HTMLDivElement>(animate);
  const [paused, setPaused] = useState(false);
  const [hover, setHover] = useState<number | null>(null);
  const [reduced, setReduced] = useState(false);
  useEffect(() => setReduced(prefersReducedMotion()), []);
  const hold = paused || hover !== null || anim === 'wait';
  const S = variant === 'events' ? [{ label: 'events', values: [0] }] : series;
  const { bufs, tick } = useStream(S, win, interval, simulate && variant !== 'events', hold);
  const clipId = useId().replace(/:/g, '');
  const name = label ?? title ?? series[0]?.label ?? '';
  const phone = width < 520;
  const fmtOf = (s?: LiveSeries) => {
    const f = numberFormatter(intl, s?.format ?? format);
    return (n: number) => f(n) + (s?.suffix ?? '');
  };
  const step = (w: number) => w / Math.max(1, win - 1);
  const shiftStyle = (px: number) => (!reduced && tick > 0 && !hold ? ({ '--kitlive-step': `${round(px)}px`, '--kitlive-t': `${interval}ms` } as React.CSSProperties) : undefined);

  // Events: their own simulation
  const [evts, setEvts] = useState<LiveEvent[]>(events);
  const [clock, setClock] = useState(0);
  const counter = useRef(1040);
  useEffect(() => {
    if (variant !== 'events') return;
    const id = setInterval(() => {
      if (paused || hover !== null) return;
      setClock((c) => c + 1);
      setEvts((prev) => {
        const aged = prev.map((e) => ({ ...e, ago: e.ago + interval / 1000 })).filter((e) => e.ago <= 60);
        if (simulate && Math.random() < 0.45 && eventNames.length) {
          counter.current += 1;
          const nm = eventNames[Math.floor(Math.random() * eventNames.length)].replace('#', `#${counter.current}`);
          const base = prev.length ? prev.reduce((a, e) => a + e.value, 0) / prev.length : 40;
          aged.push({ label: nm, value: round(Math.max(5, base * (0.4 + Math.random() * 1.3)), 2), ago: 0 });
        }
        return aged;
      });
    }, interval);
    return () => clearInterval(id);
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [variant, simulate, interval, paused, hover]);

  const status = (
    <button
      type="button"
      onClick={() => setPaused((p) => !p)}
      aria-pressed={paused}
      aria-label={paused ? t.play : t.pause}
      className="relative inline-flex h-9 items-center gap-2 rounded-md border border-border px-2.5 text-[12px] font-medium text-foreground transition-colors hover:bg-accent after:absolute after:-inset-y-1 after:inset-x-0 after:content-['']"
    >
      <span aria-hidden className="relative flex size-2">
        {!paused && hover === null && <span className="absolute inset-0 animate-ping rounded-full bg-success opacity-60 motion-reduce:animate-none" />}
        <span className={cn('relative size-2 rounded-full', paused ? 'bg-muted-foreground' : 'bg-success')} />
      </span>
      {paused ? t.paused : t.live}
      <Icon name={paused ? 'play' : 'pause'} size={14} className="text-muted-foreground" />
    </button>
  );

  const agoText = (k: number, len: number) => {
    const s = Math.round(((len - 1 - k) * interval) / 1000);
    return s <= 0 ? t.now : t.ago.replace('{n}', String(s));
  };

  /* ---------------- multi: live tiles ---------------- */
  if (variant === 'multi') {
    const cols = width >= 720 ? Math.min(3, series.length) : width >= 440 ? 2 : 1;
    return (
      <ChartFigure title={title} value={value} delta={delta} meta={meta} source={source} framed={framed} actions={status} className={className}>
        <ChartRoot anim={anim} rootRef={rootRef}>
          <style>{CSS}</style>
          <div ref={wrapRef}>
            <ul className="grid gap-px overflow-hidden rounded-lg border border-border bg-border" style={{ gridTemplateColumns: `repeat(${cols}, minmax(0, 1fr))` }} onPointerEnter={(e) => e.pointerType === 'mouse' && setHover(0)} onPointerLeave={() => setHover(null)}>
              {series.map((s, i) => {
                const b = bufs[i] ?? [];
                const f = fmtOf(s);
                const lo = s.min ?? Math.min(...s.values);
                const hi = s.max ?? Math.max(...s.values);
                const w = Math.max(120, (width - (cols - 1)) / cols - 40);
                const h = 56;
                const X = (k: number) => round(k * step(w));
                const Y = linear(lo, hi, h - 3, 3);
                const last = b[b.length - 1] ?? 0;
                const prev = b[b.length - 2] ?? last;
                return (
                  <li key={s.label} className="bg-card px-5 pb-4 pt-4">
                    <p className="flex items-center justify-between gap-2 text-[13px] text-muted-foreground">
                      <span className="truncate">{s.label}</span>
                      <span className={cn('inline-flex items-center text-[12px] tabular-nums', last > prev ? 'text-foreground' : 'text-muted-foreground')}>
                        <Icon name={last >= prev ? 'arrow-up-right' : 'arrow-down-right'} size={13} strokeWidth={2} />
                      </span>
                    </p>
                    <p className="mt-1 text-[26px] font-semibold leading-none tracking-[-0.02em] text-foreground tabular-nums">{f(last)}</p>
                    <svg width="100%" height={h} viewBox={`0 0 ${w} ${h}`} preserveAspectRatio="none" aria-hidden className="mt-3 block overflow-hidden">
                      <g key={tick} className={shiftStyle(step(w)) ? 'kitlive-shift' : undefined} style={shiftStyle(step(w))}>
                        <path d={`${linePath(b.map((v, k) => [X(k + (win - b.length)), Y(v)]))}L${X(win - 1)} ${h}L${X(win - b.length)} ${h}Z`} fill={pairColor(i)} fillOpacity="0.1" />
                        <path d={linePath(b.map((v, k) => [X(k + (win - b.length)), Y(v)]))} fill="none" stroke={pairColor(i)} strokeWidth="2" vectorEffect="non-scaling-stroke" />
                      </g>
                    </svg>
                  </li>
                );
              })}
              {/* Empty cells close the last row, so the hairline grid has no grey gap */}
              {Array.from({ length: (cols - (series.length % cols)) % cols }, (_, k) => (
                <li key={`fill${k}`} aria-hidden className="bg-card" />
              ))}
            </ul>
          </div>
          <ChartTable caption={name} head={[t.value, t.latest]} rows={series.map((s, i) => [s.label, fmtOf(s)(bufs[i]?.[bufs[i].length - 1] ?? 0)])} />
        </ChartRoot>
      </ChartFigure>
    );
  }

  /* ---------------- events ---------------- */
  if (variant === 'events') {
    const f = numberFormatter(intl, format);
    const height = 96;
    const left = 8;
    const right = width - 8;
    const X = (ago: number) => round(right - (ago / 60) * (right - left));
    const vmax = Math.max(1, ...evts.map((e) => e.value));
    const recent = [...evts].sort((a, b) => a.ago - b.ago).slice(0, phone ? 4 : 5);
    const total = evts.reduce((a, e) => a + e.value, 0);
    return (
      <ChartFigure title={title} value={value} delta={delta} meta={meta} source={source} framed={framed} actions={status} className={className}>
        <ChartRoot anim={anim} rootRef={rootRef}>
          <style>{CSS}</style>
          <div ref={wrapRef} onPointerEnter={(e) => e.pointerType === 'mouse' && setHover(0)} onPointerLeave={() => setHover(null)}>
            <ChartSurface label={name} summary={summary ?? `${evts.length} · ${f(total)}`} labels={labels} live="" table={<ChartTable caption={name} head={[t.event, t.value, t.time]} rows={recent.map((e) => [e.label, f(e.value), t.ago.replace('{n}', String(Math.round(e.ago)))])} />} focusable={false}>
              <svg width="100%" height={height} viewBox={`0 0 ${width} ${height}`} aria-hidden className="block overflow-visible">
                <line x1={left} x2={right} y1={height / 2} y2={height / 2} stroke="var(--kitch-axis)" strokeWidth="1" />
                {(phone ? [0, 30, 60] : [0, 15, 30, 45, 60]).map((s) => (
                  <g key={s}>
                    <line x1={X(s)} x2={X(s)} y1={height / 2 - 4} y2={height / 2 + 4} stroke="var(--kitch-axis)" strokeWidth="1" />
                    <text x={X(s)} y={height - 4} textAnchor={s === 0 ? 'end' : s === 60 ? 'start' : 'middle'} className="text-[11px] tabular-nums" fill="var(--muted-foreground)">
                      {s === 0 ? t.now : t.ago.replace('{n}', String(s))}
                    </text>
                  </g>
                ))}
                {evts.map((e) => {
                  const r = round(4 + Math.sqrt(e.value / vmax) * 10);
                  return (
                    <g key={e.label} style={{ transform: `translateX(${X(e.ago)}px)`, transition: reduced ? undefined : `transform ${interval}ms linear` }}>
                      {e.ago < 1.5 && !reduced && <circle cx={0} cy={height / 2} r={r} fill="var(--primary)" className="kitlive-ping" />}
                      <circle cx={0} cy={height / 2} r={r} fill="var(--primary)" fillOpacity={0.35 + 0.65 * (1 - e.ago / 60)} stroke="var(--kitch-surface)" strokeWidth="2" />
                    </g>
                  );
                })}
              </svg>
            </ChartSurface>
            <ul aria-live="polite" aria-relevant="additions" className="mt-4 grid divide-y divide-border rounded-lg border border-border">
              {recent.map((e) => (
                <li key={e.label} className="kitlive-in flex items-center justify-between gap-3 px-3.5 py-2.5 text-[13px]">
                  <span className="flex min-w-0 items-center gap-2">
                    <span aria-hidden className="size-2 shrink-0 rounded-full bg-primary" />
                    <span className="truncate text-foreground">{e.label}</span>
                  </span>
                  <span className="flex shrink-0 items-baseline gap-3">
                    <span className="font-medium tabular-nums text-foreground">{f(e.value)}</span>
                    <span className="w-16 text-right text-[12px] tabular-nums text-muted-foreground">{e.ago < 1 ? t.now : t.ago.replace('{n}', String(Math.round(e.ago)))}</span>
                  </span>
                </li>
              ))}
            </ul>
            <span className="sr-only">{clock}</span>
          </div>
        </ChartRoot>
      </ChartFigure>
    );
  }

  /* ---------------- line, bars, latency ---------------- */
  const s0 = series[0];
  const f0 = fmtOf(s0);
  const lo = Math.min(...series.map((s) => s.min ?? Math.min(...s.values)), limit ?? Infinity);
  const hi = Math.max(...series.map((s) => s.max ?? Math.max(...s.values)), limit ?? -Infinity);
  const nice = niceTicks(variant === 'bars' ? 0 : lo, hi, 4);
  const tk = tickFormatter(intl, s0?.format ?? format);
  const yLabels = nice.ticks.map((v) => tk(v) + (s0?.suffix && !/[%]/.test(tk(v)) ? (s0.suffix.trim().length <= 2 ? s0.suffix : '') : ''));
  const height = phone ? 220 : 260;
  const left = Math.max(...yLabels.map((s) => textWidth(s, 11)), 16) + 14;
  const right = width - (phone ? 10 : 64);
  const top = 16;
  const bottom = height - 26;
  const Y = linear(nice.min, nice.max, bottom, top);
  const w = right - left;
  const X = (k: number) => round(left + k * step(w));
  const b0 = bufs[0] ?? [];
  const lastV = b0[b0.length - 1] ?? 0;
  const pick = (clientX: number, el: HTMLElement) => {
    const r = el.getBoundingClientRect();
    const px = (clientX - r.left) * (width / (r.width || width));
    const k = Math.round((px - left) / step(w)) - (win - b0.length);
    setHover(k >= 0 && k < b0.length ? k : null);
  };
  const onKeyDown = (e: React.KeyboardEvent) => {
    const cur = hover ?? b0.length;
    let next: number | null = cur;
    if (e.key === 'ArrowLeft') next = Math.max(0, cur - 1);
    else if (e.key === 'ArrowRight') next = Math.min(b0.length - 1, cur + 1);
    else if (e.key === 'Escape') next = null;
    else if (e.key === ' ' || e.key === 'Enter') {
      e.preventDefault();
      return setPaused((p) => !p);
    } else return;
    e.preventDefault();
    setHover(next);
  };
  const off = (b: number[]) => win - b.length;
  const shift = shiftStyle(step(w));
  const hoverVal = hover !== null ? b0[hover] : null;
  const legend =
    series.length > 1 ? (
      <ul className="mb-3 flex flex-wrap items-center gap-x-4 gap-y-1.5 text-[12px] text-muted-foreground">
        {series.map((s, i) => (
          <li key={s.label} className="flex items-center gap-1.5">
            <Swatch shape="line" color={pairColor(i)} />
            {s.label}
            <span className="font-medium tabular-nums text-foreground">{fmtOf(s)((bufs[i] ?? [])[(bufs[i] ?? []).length - 1] ?? 0)}</span>
          </li>
        ))}
        {limit !== undefined && (
          <li className="flex items-center gap-1.5">
            <Swatch shape="line" dashed color="var(--kitfg-down)" />
            {limitLabel}
          </li>
        )}
      </ul>
    ) : null;

  return (
    <ChartFigure title={title} value={value} delta={delta} meta={meta} source={source} framed={framed} actions={status} className={className}>
      <ChartRoot anim={anim} rootRef={rootRef}>
        <style>{CSS}</style>
        {legend}
        <div ref={wrapRef}>
          <ChartSurface
            label={name}
            summary={summary ?? `${s0?.label ?? ''} ${f0(lastV)}`}
            labels={labels}
            live={hover !== null && hoverVal !== null && hoverVal !== undefined ? `${agoText(hover, b0.length)}. ${f0(hoverVal)}` : ''}
            table={<ChartTable caption={name} head={[t.time, ...series.map((s) => s.label)]} rows={b0.slice(-10).map((_, k) => { const idx = b0.length - 10 + k; return [agoText(idx, b0.length), ...series.map((s, i) => fmtOf(s)((bufs[i] ?? [])[idx] ?? 0))]; })} />}
            onKeyDown={onKeyDown}
            onFocus={(e) => e.target === e.currentTarget && e.currentTarget.matches(':focus-visible') && setHover(b0.length - 1)}
            onBlur={() => setHover(null)}
            onPointerMove={(e) => pick(e.clientX, e.currentTarget)}
            onPointerDown={(e) => pick(e.clientX, e.currentTarget)}
            onPointerLeave={(e) => e.pointerType === 'mouse' && setHover(null)}
          >
            <svg width="100%" height={height} viewBox={`0 0 ${width} ${height}`} aria-hidden className="block overflow-visible">
              <defs>
                <clipPath id={clipId}>
                  <rect x={left} y={0} width={w + 2} height={height} />
                </clipPath>
              </defs>
              <PlotAxes left={left} right={right} top={top} bottom={bottom} height={height} yTicks={nice.ticks.map((v, i) => ({ at: Y(v), label: yLabels[i], strong: v === 0 }))} />
              <text x={right} y={height - 6} textAnchor="end" className="text-[11px]" fill="var(--muted-foreground)">{t.now}</text>
              <text x={left} y={height - 6} className="text-[11px] tabular-nums" fill="var(--muted-foreground)">{t.ago.replace('{n}', String(Math.round(((win - 1) * interval) / 1000)))}</text>
              {limit !== undefined && (
                <g>
                  <line x1={left} x2={right} y1={Y(limit)} y2={Y(limit)} stroke="var(--kitfg-down)" strokeWidth="1.5" strokeDasharray="5 4" />
                </g>
              )}
              <g clipPath={`url(#${clipId})`}>
                <g key={tick} className={shift ? 'kitlive-shift' : undefined} style={shift}>
                  {variant === 'bars' &&
                    b0.map((v, k) => {
                      const bw = Math.max(2, step(w) * 0.62);
                      const x = X(k + off(b0)) - bw / 2;
                      return <path key={k} d={barPath(x, Y(v), bw, Y(nice.min) - Y(v), 2, 'up')} fill={k === b0.length - 1 ? 'var(--primary)' : 'color-mix(in oklab, var(--primary) 45%, var(--card))'} opacity={hover !== null && hover !== k ? 0.55 : 1} />;
                    })}
                  {variant === 'latency' && series.length > 1 && (
                    <path d={`${linePath((bufs[1] ?? []).map((v, k) => [X(k + off(bufs[1])), Y(v)]))}L${X(win - 1)} ${Y((bufs[0] ?? [])[(bufs[0] ?? []).length - 1] ?? 0)}${[...(bufs[0] ?? [])].map((v, k) => [X(k + off(bufs[0])), Y(v)] as [number, number]).reverse().map(([x, y]) => `L${x} ${y}`).join('')}Z`} fill="var(--primary)" fillOpacity="0.12" />
                  )}
                  {variant !== 'bars' &&
                    series.map((s, i) => {
                      const b = bufs[i] ?? [];
                      return <path key={s.label} d={linePath(b.map((v, k) => [X(k + off(b)), Y(v)]))} fill="none" stroke={variant === 'latency' ? (i === 0 ? 'var(--primary)' : 'var(--kitfg-3)') : pairColor(i)} strokeWidth="2" strokeLinejoin="round" strokeLinecap="round" />;
                    })}
                  {variant === 'line' && <path d={`${linePath(b0.map((v, k) => [X(k + off(b0)), Y(v)]))}L${X(win - 1)} ${bottom}L${X(off(b0))} ${bottom}Z`} fill="var(--primary)" fillOpacity="0.08" />}
                </g>
              </g>
              {/* Newest point, pulsing, and its value at the right edge */}
              {variant !== 'bars' && b0.length > 0 && (
                <g>
                  {!hold && !reduced && <circle cx={X(win - 1)} cy={Y(lastV)} r={4.5} fill="var(--primary)" className="kitlive-ping" />}
                  <circle cx={X(win - 1)} cy={Y(lastV)} r={4.5} fill="var(--primary)" stroke="var(--kitch-surface)" strokeWidth="2" className="transition-[cy] duration-300" />
                </g>
              )}
              {!phone && (
                <g style={{ transform: `translateY(${round(Y(lastV))}px)` }} className="transition-transform duration-300">
                  <rect x={right + 8} y={-10} width={textWidth(f0(lastV), 11) + 12} height={20} rx="4" fill="var(--foreground)" />
                  <text x={right + 14} y={0} dy="0.34em" className="text-[11px] font-semibold tabular-nums" fill="var(--background)">{f0(lastV)}</text>
                </g>
              )}
              {hover !== null && hoverVal !== undefined && hoverVal !== null && (
                <g>
                  <line x1={X(hover + off(b0))} x2={X(hover + off(b0))} y1={top} y2={bottom} stroke="var(--kitch-axis)" strokeWidth="1" />
                  <circle cx={X(hover + off(b0))} cy={Y(hoverVal)} r={4.5} fill="var(--primary)" stroke="var(--kitch-surface)" strokeWidth="2" />
                  <text x={X(hover + off(b0))} y={top - 4} textAnchor={X(hover + off(b0)) > right - 60 ? 'end' : X(hover + off(b0)) < left + 60 ? 'start' : 'middle'} className="text-[11px] font-semibold tabular-nums" fill="var(--foreground)" style={HALO}>
                    {`${f0(hoverVal)} · ${agoText(hover, b0.length)}`}
                  </text>
                </g>
              )}
            </svg>
          </ChartSurface>
          <p className="mt-2 flex min-h-5 items-center gap-1.5 text-[12px] text-muted-foreground">
            {hover !== null && !paused ? (
              <>
                <Icon name="pause" size={13} />
                {t.held}
              </>
            ) : variant === 'bars' ? (
              `${s0?.label ?? ''} ${t.perSec}`
            ) : null}
          </p>
        </div>
      </ChartRoot>
    </ChartFigure>
  );
}