"use client";
import { memo, useEffect, useMemo, useRef } from "react";
import { useAnimationLoop, type Metrics } from "@/hooks/use-animation-loop";
export type TelemetryColumns = "2" | "3" | "4";
export type TelemetryFill = "none" | "gradient" | "solid";
interface TelemetryProps {
tiles?: number;
columns?: TelemetryColumns;
sampleRate?: number;
history?: number;
smoothing?: number;
threshold?: number;
scars?: boolean;
cursor?: boolean;
fill?: TelemetryFill;
traceColor?: string;
breachColor?: string;
paused?: boolean;
reducedMotion?: boolean;
className?: string;
}
interface Metric {
name: string;
unit: string;
base: number;
span: number;
drift: number;
noise: number;
spike: number;
digits: number;
}
const METRICS: Metric[] = [
{ name: "p99 latency", unit: "ms", base: 60, span: 180, drift: 0.09, noise: 0.1, spike: 0.02, digits: 0 },
{ name: "throughput", unit: "rps", base: 1900, span: 1100, drift: 0.05, noise: 0.05, spike: 0, digits: 0 },
{ name: "error rate", unit: "%", base: 0.02, span: 2.4, drift: 0.04, noise: 0.06, spike: 0.035, digits: 2 },
{ name: "cpu", unit: "%", base: 22, span: 62, drift: 0.07, noise: 0.07, spike: 0.008, digits: 0 },
{ name: "heap", unit: "MB", base: 480, span: 380, drift: 0.03, noise: 0.03, spike: 0, digits: 0 },
{ name: "queue depth", unit: "", base: 2, span: 180, drift: 0.06, noise: 0.09, spike: 0.03, digits: 0 },
{ name: "cache hit", unit: "%", base: 90, span: 9, drift: 0.05, noise: 0.04, spike: 0, digits: 1 },
{ name: "connections", unit: "", base: 620, span: 520, drift: 0.04, noise: 0.05, spike: 0.006, digits: 0 },
{ name: "gc pause", unit: "ms", base: 2, span: 38, drift: 0.11, noise: 0.12, spike: 0.03, digits: 1 },
{ name: "disk io", unit: "MB/s", base: 40, span: 220, drift: 0.08, noise: 0.09, spike: 0.012, digits: 0 },
{ name: "retries", unit: "", base: 0, span: 42, drift: 0.1, noise: 0.14, spike: 0.028, digits: 0 },
{ name: "saturation", unit: "%", base: 30, span: 60, drift: 0.06, noise: 0.06, spike: 0.01, digits: 0 },
];
function mulberry32(seed: number): () => number {
let a = seed >>> 0;
return () => {
a = (a + 0x6d2b79f5) >>> 0;
let t = Math.imul(a ^ (a >>> 15), 1 | a);
t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t;
return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
};
}
function hexToRgb(hex: string): [number, number, number] {
const h = hex.replace("#", "");
const full = h.length === 3 ? h.split("").map((c) => c + c).join("") : h;
const n = parseInt(full, 16);
if (Number.isNaN(n) || full.length !== 6) return [255, 255, 255];
return [(n >> 16) & 255, (n >> 8) & 255, n & 255];
}
interface Series {
values: Float32Array;
breached: Uint8Array;
head: number;
filled: number;
phase: number;
freq: [number, number, number];
level: number;
smoothed: number;
rng: () => number;
}
const Telemetry = memo(
({
tiles = 8,
columns = "4",
sampleRate = 8,
history = 45,
smoothing = 0.25,
threshold = 0.82,
scars = true,
cursor = true,
fill = "gradient",
traceColor = "#a855f7",
breachColor = "#f87171",
paused = false,
reducedMotion = false,
className,
}: TelemetryProps) => {
const containerRef = useRef<HTMLDivElement>(null);
const canvasRefs = useRef<(HTMLCanvasElement | null)[]>([]);
const plotRefs = useRef<(HTMLDivElement | null)[]>([]);
const readoutRefs = useRef<(HTMLSpanElement | null)[]>([]);
const drawRef = useRef<((dt: number) => void | false) | null>(null);
const measureRef = useRef<((m: Metrics) => void) | null>(null);
const cursorRef = useRef({ at: 0, active: false });
const count = Math.max(1, Math.min(METRICS.length, Math.round(tiles)));
const shown = useMemo(() => METRICS.slice(0, count), [count]);
const live = useRef({
sampleRate, history, smoothing, threshold, scars, cursor, fill,
traceColor, breachColor, reducedMotion,
});
live.current = {
sampleRate, history, smoothing, threshold, scars, cursor, fill,
traceColor, breachColor, reducedMotion,
};
const loop = useAnimationLoop({
target: containerRef,
halted: paused || reducedMotion,
dpr: "auto",
onResize: (metrics) => measureRef.current?.(metrics),
onFrame: ({ dt }) => (drawRef.current ? drawRef.current(dt) : false),
});
useEffect(() => {
const container = containerRef.current;
if (!container) return;
const rate = Math.max(1, Math.round(live.current.sampleRate));
const windowSeconds = Math.max(5, Math.round(live.current.history));
const capacity = Math.max(8, rate * windowSeconds);
const series: Series[] = shown.map((m, i) => ({
values: new Float32Array(capacity),
breached: new Uint8Array(capacity),
head: 0,
filled: 0,
phase: i * 1.37,
freq: [
0.42 + ((i * 0.618) % 1) * 0.62,
0.15 + ((i * 0.379) % 1) * 0.3,
1.2 + ((i * 0.827) % 1) * 1.4,
],
level: 0.5,
smoothed: 0.5,
rng: mulberry32(0x9e37 + i * 7919),
}));
const advance = (s: Series, m: Metric, step: number) => {
s.phase += step * (0.35 + m.drift * 4);
const wave =
Math.sin(s.phase * s.freq[0]) * 0.28 +
Math.sin(s.phase * s.freq[1] + 1.1) * 0.17 +
Math.sin(s.phase * s.freq[2] + 2.3) * 0.06;
const jitter = (s.rng() - 0.5) * 2 * m.noise;
let next = 0.5 + wave + jitter;
if (m.spike > 0 && s.rng() < m.spike * step * 8) {
next += 0.35 + s.rng() * 0.45;
}
s.level = Math.max(0, Math.min(1, next));
};
const push = (s: Series, value: number, breach: boolean) => {
s.values[s.head] = value;
s.breached[s.head] = breach ? 1 : 0;
s.head = (s.head + 1) % capacity;
if (s.filled < capacity) s.filled++;
};
const sampleOnce = (s: Series, m: Metric, step: number) => {
const l = live.current;
advance(s, m, step);
const k = Math.max(0, Math.min(0.95, l.smoothing));
s.smoothed = s.smoothed * k + s.level * (1 - k);
push(s, s.smoothed, s.smoothed >= l.threshold);
};
for (let i = 0; i < series.length; i++) {
for (let k = 0; k < capacity; k++) {
sampleOnce(series[i], shown[i], 1 / rate);
}
}
let accumulator = 0;
const sizeCanvases = (dpr: number) => {
for (let i = 0; i < canvasRefs.current.length; i++) {
const canvas = canvasRefs.current[i];
const plot = plotRefs.current[i];
if (!canvas || !plot) continue;
const box = plot.getBoundingClientRect();
const w = Math.max(1, Math.floor(box.width));
const h = Math.max(1, Math.floor(box.height));
canvas.width = Math.max(1, Math.round(w * dpr));
canvas.height = Math.max(1, Math.round(h * dpr));
canvas.style.width = `${w}px`;
canvas.style.height = `${h}px`;
const ctx = canvas.getContext("2d");
if (ctx) ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
}
};
const at = (s: Series, frac: number): { value: number; breach: boolean } => {
const back = Math.round((1 - frac) * (capacity - 1));
const idx = (s.head - 1 - back + capacity * 2) % capacity;
return { value: s.values[idx], breach: s.breached[idx] === 1 };
};
const drawTile = (i: number) => {
const l = live.current;
const canvas = canvasRefs.current[i];
if (!canvas) return;
const ctx = canvas.getContext("2d");
if (!ctx) return;
const s = series[i];
const m = shown[i];
const width = parseFloat(canvas.style.width) || 1;
const height = parseFloat(canvas.style.height) || 1;
ctx.clearRect(0, 0, width, height);
if (s.filled < 2) return;
const [tr, tg, tb] = hexToRgb(l.traceColor);
const [br, bg, bb] = hexToRgb(l.breachColor);
const pad = 3;
const plotH = Math.max(1, height - pad * 2);
const xAt = (k: number) => (k / (capacity - 1)) * width;
const yAt = (v: number) => pad + (1 - v) * plotH;
const valueAt = (k: number) => {
const idx = (s.head - capacity + k + capacity * 2) % capacity;
return { v: s.values[idx], b: s.breached[idx] === 1 };
};
if (l.fill !== "none") {
ctx.beginPath();
ctx.moveTo(0, height);
for (let k = 0; k < capacity; k++) ctx.lineTo(xAt(k), yAt(valueAt(k).v));
ctx.lineTo(width, height);
ctx.closePath();
if (l.fill === "gradient") {
const grad = ctx.createLinearGradient(0, 0, 0, height);
grad.addColorStop(0, `rgba(${tr}, ${tg}, ${tb}, 0.34)`);
grad.addColorStop(1, `rgba(${tr}, ${tg}, ${tb}, 0.02)`);
ctx.fillStyle = grad;
} else {
ctx.fillStyle = `rgba(${tr}, ${tg}, ${tb}, 0.16)`;
}
ctx.fill();
}
ctx.strokeStyle = `rgba(${br}, ${bg}, ${bb}, 0.28)`;
ctx.setLineDash([2, 3]);
ctx.lineWidth = 1;
ctx.beginPath();
ctx.moveTo(0, yAt(l.threshold));
ctx.lineTo(width, yAt(l.threshold));
ctx.stroke();
ctx.setLineDash([]);
ctx.lineWidth = 1.4;
ctx.lineJoin = "round";
ctx.strokeStyle = `rgba(${tr}, ${tg}, ${tb}, 0.95)`;
ctx.beginPath();
for (let k = 0; k < capacity; k++) {
const x = xAt(k);
const y = yAt(valueAt(k).v);
if (k === 0) ctx.moveTo(x, y);
else ctx.lineTo(x, y);
}
ctx.stroke();
if (l.scars) {
ctx.strokeStyle = `rgba(${br}, ${bg}, ${bb}, 0.9)`;
ctx.lineWidth = 1;
for (let k = 0; k < capacity; k++) {
const point = valueAt(k);
if (!point.b) continue;
const x = xAt(k);
ctx.beginPath();
ctx.moveTo(x, yAt(point.v) - 3);
ctx.lineTo(x, yAt(point.v) + 3);
ctx.stroke();
}
}
const c = cursorRef.current;
if (l.cursor && c.active) {
const x = c.at * width;
const point = at(s, c.at);
ctx.strokeStyle = `rgba(${tr}, ${tg}, ${tb}, 0.55)`;
ctx.lineWidth = 1;
ctx.beginPath();
ctx.moveTo(x, 0);
ctx.lineTo(x, height);
ctx.stroke();
ctx.fillStyle = point.breach
? `rgba(${br}, ${bg}, ${bb}, 1)`
: `rgba(${tr}, ${tg}, ${tb}, 1)`;
ctx.beginPath();
ctx.arc(x, yAt(point.value), 2.6, 0, Math.PI * 2);
ctx.fill();
}
const node = readoutRefs.current[i];
if (node) {
const point = l.cursor && c.active ? at(s, c.at) : at(s, 1);
const real = m.base + point.value * m.span;
node.textContent = `${real.toFixed(m.digits)}${m.unit ? ` ${m.unit}` : ""}`;
node.style.color = point.breach ? l.breachColor : "";
}
};
drawRef.current = (dt) => {
const l = live.current;
const step = 1 / Math.max(1, Math.round(l.sampleRate));
accumulator += Math.min(dt, 0.5);
let guard = 0;
while (accumulator >= step && guard < 30) {
for (let i = 0; i < series.length; i++) sampleOnce(series[i], shown[i], step);
accumulator -= step;
guard++;
}
for (let i = 0; i < series.length; i++) drawTile(i);
};
measureRef.current = ({ dpr }) => {
sizeCanvases(dpr);
for (let i = 0; i < series.length; i++) drawTile(i);
};
loop.resize();
loop.start();
return () => {
drawRef.current = null;
measureRef.current = null;
};
// eslint-disable-next-line react-hooks/exhaustive-deps
}, [shown, sampleRate, history]);
const track = (event: React.PointerEvent<HTMLDivElement>) => {
const box = event.currentTarget.getBoundingClientRect();
if (box.width === 0) return;
cursorRef.current.at = Math.max(
0,
Math.min(1, (event.clientX - box.left) / box.width),
);
cursorRef.current.active = true;
loop.paint();
};
const release = () => {
cursorRef.current.active = false;
loop.paint();
};
return (
<div
ref={containerRef}
className={className ?? "grid h-full w-full gap-2 p-3"}
style={{
gridTemplateColumns: `repeat(${Math.max(1, Number(columns) || 4)}, minmax(0, 1fr))`,
}}
onPointerLeave={release}
>
{shown.map((metric, i) => (
<div
key={metric.name}
className="flex min-h-0 min-w-0 flex-col overflow-hidden rounded-md border border-hairline bg-panel/50 p-2"
>
<div className="flex items-baseline justify-between gap-2">
<span className="truncate font-display text-[9px] tracking-[0.18em] text-ink-mute uppercase">
{metric.name}
</span>
<span
ref={(node) => {
readoutRefs.current[i] = node;
}}
className="font-mono text-[11px] text-ink tabular-nums"
>
—
</span>
</div>
<div
ref={(node) => {
plotRefs.current[i] = node;
}}
className="relative mt-1.5 min-h-0 flex-1 select-none"
onPointerMove={track}
>
<canvas
ref={(node) => {
canvasRefs.current[i] = node;
}}
className="absolute top-0 left-0 block touch-none"
/>
</div>
</div>
))}
</div>
);
},
);
Telemetry.displayName = "Telemetry";
export default Telemetry;