"use client"; import * as React from "react"; import { AnimatePresence, animate, motion, useMotionValue, useReducedMotion, useTransform } from "motion/react"; import { clsx, type ClassValue } from "clsx"; import { twMerge } from "tailwind-merge"; function cn(...inputs: ClassValue[]) { return twMerge(clsx(inputs)); } export interface UsageLimitValue { limit: number; alerts: number[]; atLimit: "pause" | "notify"; } export interface UsageLimitSliderCardProps { spent?: number; forecast?: number; max?: number; day?: number; daysInMonth?: number; breakdown?: { label: string; amount: number; color: string }[]; defaultValue?: UsageLimitValue; onSave?: (value: UsageLimitValue) => Promise | void; theme?: "dark" | "light"; className?: string; } const PALETTES = { dark: { bg: "#0A0A0A", text: "#F5F4F1", muted: "rgba(245,244,241,0.62)", faint: "rgba(245,244,241,0.36)", card: "#121212", border: "rgba(255,255,255,0.09)", track: "rgba(255,255,255,0.07)", well: "rgba(255,255,255,0.035)", on: "#F5F4F1", onText: "#0A0A0A", accent: "#60A5FA", green: "#4ADE80", amber: "#FBBF24", red: "#F87171", ring: "rgba(245,244,241,0.6)" }, light: { bg: "#FAFAF8", text: "#0A0A0A", muted: "rgba(10,10,10,0.62)", faint: "rgba(10,10,10,0.42)", card: "#FFFFFF", border: "rgba(10,10,10,0.1)", track: "rgba(10,10,10,0.07)", well: "rgba(10,10,10,0.03)", on: "#0A0A0A", onText: "#FAFAF8", accent: "#2563EB", green: "#15803D", amber: "#B45309", red: "#DC2626", ring: "rgba(10,10,10,0.5)" }, }; const BREAKDOWN = [ { label: "Compute", amount: 388, color: "#60A5FA" }, { label: "Storage", amount: 142, color: "#A78BFA" }, { label: "Bandwidth", amount: 74, color: "#34D399" }, { label: "AI credits", amount: 38, color: "#FBBF24" }, ]; const PRESETS = [500, 1000, 1500, 2000]; const money = (n: number) => `$${Math.round(n).toLocaleString("en-US")}`; export function UsageLimitSliderCard({ spent = 642, forecast = 1180, max = 2500, day = 12, daysInMonth = 30, breakdown = BREAKDOWN, defaultValue = { limit: 1000, alerts: [50, 90], atLimit: "notify" }, onSave, theme = "dark", className }: UsageLimitSliderCardProps) { const p = PALETTES[theme]; const reduce = !!useReducedMotion(); const uid = React.useId(); const [saved, setSaved] = React.useState(defaultValue); const [v, setV] = React.useState(defaultValue); const [dragging, setDragging] = React.useState(false); const [status, setStatus] = React.useState<"idle" | "saving" | "saved">("idle"); const timer = React.useRef | null>(null); const mv = useMotionValue(defaultValue.limit); const shown = useTransform(mv, (x) => money(x)); React.useEffect(() => { const c = animate(mv, v.limit, { duration: dragging || reduce ? 0 : 0.35, ease: [0.22, 1, 0.36, 1] }); return () => c.stop(); }, [v.limit, mv, dragging, reduce]); React.useEffect(() => { if (status !== "saved") return; const t = setTimeout(() => setStatus("idle"), 1800); return () => clearTimeout(t); }, [status]); React.useEffect( () => () => { if (timer.current) clearTimeout(timer.current); }, [], ); const dirty = JSON.stringify(v) !== JSON.stringify(saved); const pct = (x: number) => `${Math.min(100, (x / max) * 100)}%`; const perDay = spent / day; const hitDay = v.limit > spent ? Math.ceil(v.limit / perDay) : day; const hits = v.limit < forecast; const usedOfLimit = v.limit ? spent / v.limit : 1; const tone = usedOfLimit >= 0.9 || v.limit <= spent ? p.red : hits ? p.amber : p.green; const save = () => { if (!dirty || status === "saving") return; setStatus("saving"); const snap = v; const done = () => { setSaved(snap); setStatus("saved"); }; const r = onSave?.(snap); if (r instanceof Promise) r.then(done, () => setStatus("idle")); else timer.current = setTimeout(done, reduce ? 0 : 700); }; const ring = { ["--tw-ring-color" as string]: p.ring, ["--tw-ring-offset-color" as string]: p.card } as React.CSSProperties; const focus = "outline-none focus-visible:ring-2 focus-visible:ring-offset-2"; return (

Monthly spending limit

Day {day} of {daysInMonth} · {money(spent)} spent so far · on track for {money(forecast)}

limit

{/* Slider */}

{breakdown.map((b) => ( ))}

{/* markers */} setV((s) => ({ ...s, limit: Number(e.target.value) }))} onPointerDown={() => setDragging(true)} onPointerUp={() => setDragging(false)} onBlur={() => setDragging(false)} aria-labelledby={`${uid}-t`} aria-valuetext={`${money(v.limit)} a month${hits ? `, below the ${money(forecast)} forecast` : ""}`} className={cn("absolute inset-x-0 top-[14px] h-9 w-full cursor-grab appearance-none bg-transparent opacity-0 active:cursor-grabbing", focus)} style={ring} />

{PRESETS.map((x) => ( ))}

{v.limit <= spent ? `You've already spent ${money(spent)}. A ${money(v.limit)} limit would ${v.atLimit === "pause" ? "pause services right away" : "trigger an alert right away"}.` : hits ? `At this pace you'll reach ${money(v.limit)} around Nov ${hitDay}, ${daysInMonth - hitDay} days before the month ends.` : `Room to spare: the forecast is ${money(forecast)}, ${Math.round((1 - forecast / v.limit) * 100)}% under your limit.`}

Email me at

{[50, 75, 90].map((a) => { const on = v.alerts.includes(a); return ( setV((s) => ({ ...s, alerts: on ? s.alerts.filter((x) => x !== a) : [...s.alerts, a].sort((x, y) => x - y) }))} className="h-3.5 w-3.5 cursor-pointer" style={{ accentColor: p.accent }} /> {a}% {money((v.limit * a) / 100)} ); })}

When the limit is reached

{( [ ["notify", "Notify me, keep things running"], ["pause", "Pause paid services until next month"], ] as const ).map(([k, label]) => ( setV((s) => ({ ...s, atLimit: k }))} className="h-4 w-4 cursor-pointer" style={{ accentColor: k === "pause" ? p.red : p.on }} /> {label} ))}

This month so far

{b.label} {money(b.amount)}

{status === "saved" && !dirty && ( ✓ Limit saved )}

); } export default UsageLimitSliderCard;