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"react" import { AnimatePresence, motion, useReducedMotion } from "motion/react" import { cn } from "@/lib/utils" const EASE = [0.16, 1, 0.3, 1] as const const AMBER = "var(--chart-amber)" const GREEN = "var(--chart-up)" const RED = "var(--chart-down)" const CARD = "var(--card)" const HAIRLINE = "var(--border)" /** The one dotted ground — follows the theme through --foreground. */ const DOT_GRID = "radial-gradient(color-mix(in srgb, var(--foreground) 5%, transparent) 1px, transparent 1px) 0 0 / 14px 14px" const W = 298 // card inner width (300 minus the 1px borders) — the line runs flush edge to edge const H = 110 const SAMPLES = 48 export interface IndexQuote { label: string /** Already-formatted close, e.g. "5,648.40". */ price: string /** Already-formatted change, e.g. "+63.97 (+1.15%)" — a leading − flips the hue. */ delta: string /** Deterministic seed for this index's intraday walk. */ seed: number /** The one-paragraph read under the tabs. */ note: string } const DEFAULT_INDICES: IndexQuote[] = [ { label: "S&P 500", price: "5,648.40", delta: "+63.97 (+1.15%)", seed: 5, note: "Broad strength into the close; breadth improved with 8 of 11 sectors green, led by industrials and financials.", }, { label: "Dow 30", price: "41,563.08", delta: "+228.03 (+0.55%)", seed: 31, note: "Blue chips ground higher through the session, helped by a soft-landing read on the latest inflation print.", }, { label: "Nasdaq", price: "17,713.62", delta: "+197.19 (+1.13%)", seed: 77, note: "Megacap tech carried the tape; semis rebounded from early weakness to finish near session highs.", }, { label: "Russel 2K", price: "2,178.52", delta: "+14.10 (+0.65%)", seed: 111, note: "Consumer sentiment turned up for the first time after five months of stagnant readings, and small caps took the hint.", }, ] /** Deterministic intraday walk — same seed, same shape, every render. */ function walk(seed: number, n: number) { let s = seed let v = 40 const out: number[] = [] for (let i = 0; i < n; i++) { s = (s * 48271) % 2147483647 v = Math.max(10, v + (s / 2147483647 - 0.42) * 5) out.push(v) } return out } /** Session clock across the samples — open → close, spread evenly. */ function timeAt(i: number, n: number, openMin: number, closeMin: number) { const m = openMin + Math.round((i / (n - 1)) * (closeMin - openMin)) const h = Math.floor(m / 60) return `${((h + 11) % 12) + 1}:${String(m % 60).padStart(2, "0")} ${h < 12 ? "AM" : "PM"}` } export interface IndexCardProps { /** Quiet label above the price — a caption, not a section header. */ eyebrow?: string /** One tab per index; the first four fit the 300px card comfortably. */ indices?: IndexQuote[] /** Which tab opens selected. */ defaultIndex?: number /** Session bounds for the scrub tooltip, in minutes past midnight. */ openMinutes?: number closeMinutes?: number /** Fires when a tab is chosen. */ onSelect?: (index: IndexQuote, i: number) => void className?: string } /** * Markets sidebar card: one big price, an index switcher whose underline walks * between tabs, a full-bleed line you can scrub, and the one-paragraph read * below. Scrubbing snaps a crosshair to the nearest real sample, floats the * session time above it, recomputes the headline off the hovered point, and * dims everything to the right of the cursor so the eye stops where the pointer * is. Switching index swaps price, line and story together. */ export function IndexCard({ eyebrow = "Markets", indices = DEFAULT_INDICES, defaultIndex = 3, openMinutes = 570, closeMinutes = 960, onSelect, className, }: IndexCardProps) { const reduced = useReducedMotion() const uid = useId().replace(/:/g, "") const [active, setActive] = useState(Math.min(Math.max(defaultIndex, 0), indices.length - 1)) const idx = indices[active] const up = !idx.delta.trim().startsWith("-") && !idx.delta.trim().startsWith("−") const hue = up ? GREEN : RED const data = useMemo(() => walk(idx.seed, SAMPLES), [idx.seed]) const n = data.length const min = Math.min(...data) const max = Math.max(...data) const px = (i: number) => (i / (n - 1)) * W const py = (v: number) => 6 + (1 - (v - min) / (max - min || 1)) * (H - 12) const line = data.map((v, i) => `${px(i).toFixed(1)},${py(v).toFixed(1)}`).join(" L") // The crosshair magnets to the NEAREST sample and drives the readout // synchronously — lag reads as broken on a quote card. const svgRef = useRef(null) const [hover, setHover] = useState(null) const onMove = (e: React.PointerEvent) => { const el = svgRef.current if (!el) return const r = el.getBoundingClientRect() const x = ((e.clientX - r.left) / r.width) * W setHover(Math.max(0, Math.min(n - 1, Math.round((x / W) * (n - 1))))) } const onLeave = () => setHover(null) const close = parseFloat(idx.price.replace(/,/g, "")) const shownPrice = hover == null || !Number.isFinite(close) ? idx.price : ((close * data[hover]) / data[n - 1]).toLocaleString("en-US", { minimumFractionDigits: 2, maximumFractionDigits: 2, }) const crossX = hover == null ? 0 : px(hover) return (

{/* a quiet label, not a section header — one step down in size and weight */}

{eyebrow}

${shownPrice} {idx.delta}

{/* full-bleed scrubbable line — no side padding; right of the cursor dims */}

{/* dotted graph paper behind the line */}

{/* base chart — drops opacity while scrubbing (the "right side" read) */} {/* full-strength copy clipped to the LEFT of the cursor */} {hover != null && ( )} {/* crosshair — synchronous, snapped to the real datum */} {hover != null && ( )} {/* session time riding the cursor */} {hover != null && (

W - 28 ? "-100%" : "-50%"})`, background: CARD, borderColor: HAIRLINE, }} role="status" > {timeAt(hover, n, openMinutes, closeMinutes)}

)}

{/* index tabs — the underline walks to the new slot */}

{indices.map((ix, i) => ( ))}

{idx.note}

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