64:I[314491,["/_next/static/immutable/chunks/3arlv5bvukoo2.js","/_next/static/immutable/chunks/39v64hmfyo-sr.js","/_next/static/immutable/chunks/2nvof3-29tvc3.js","/_next/static/immutable/chunks/3tjobt77z_9dj.js","/_next/static/immutable/chunks/04j_o97cgxn2x.js","/_next/static/immutable/chunks/3upr08c9vtj8w.js","/_next/static/immutable/chunks/1ww0328si-u8x.js","/_next/static/immutable/chunks/11mfl5ymqld9-.js","/_next/static/immutable/chunks/2xxcqy6ppds3l.js","/_next/static/immutable/chunks/1bpgyrs5qflhu.js","/_next/static/immutable/chunks/0-6vu2ul1h6ld.js","/_next/static/immutable/chunks/43_s7jweyypoh.js","/_next/static/immutable/chunks/0p6vao205o1jc.js","/_next/static/immutable/chunks/1_kyvgkyokw92.js","/_next/static/immutable/chunks/1lo-zn37dolb5.js","/_next/static/immutable/chunks/1v8k6yxw1rg0u.js"],"FilesView"] 65:T33fa,"use client"; import { useEffect, useMemo, useRef, useState } from "react"; // --------------------------------------------------------------------------- // BombeDrumHalt — a search/lookup loading indicator built as the Bombe's // drum-and-stop search cycle: banks of rotating drums spin continuously // through a hypothesis space; a sensing relay bank tests each position as // the drums pass it, and when a candidate briefly satisfies the test the // whole bank locks dead for a beat (a diagonal-board-style check running // against it) before releasing and resuming — almost every stop a false // positive. Sourced from the drum-and-stop search cycle itself, not the // electrical/plugboard logic the real machine tested. // // Four vertical drum columns, each an overflow:hidden window over a // repeating tick-mark strip. The strip is NOT a uniform 1-tick gradient — // a uniform pattern repeats every single tick, which makes a drum's visible // state alias back to itself dozens of times a second and leaves t0/2.5s/5s // screenshots indistinguishable whenever no halt happens to be mid-flight. // Instead each drum's strip is one 26-position revolution (one per rotor // letter, historically the right count for a Bombe drum): every 5th // position is a heavier tick and position 0 is a distinct brighter datum // mark, so a screenshot of a drum's resting phase is legible and never // repeats for ~2s of continuous scan. // // All four columns share ONE driving clock (a single rAF loop tracking one // `phase` state machine: scan -> decel -> hold -> reaccel -> scan) rather // than four independent CSS animation timelines, specifically so a halt can // pause that clock precisely instead of fighting four separately-running // loops back into sync. Each drum's on-screen offset is (accumulated // scroll px) mod (one full 26-tick revolution); the per-drum phase stagger // (drum N reads N*0.6s "ahead") is nothing more than a different starting // offset on that same shared clock, so the drums never need independent // timers to stay out of lock-step. // // A halt is scheduled 4-6s out (re-rolled after every resume, never a fixed // metronome). Decel eases speed 1 -> 0 over 180ms while the sensing bar // brightens from its idle 20% opacity toward peak; hold hangs at zero // velocity for 900ms at 90% bar opacity (the "check running" beat); reaccel // eases 0 -> 1 back over 220ms as the bar dims back to idle. On 15% of // resumes a single randomly-chosen drum gets a 40%-opacity outline ring at // the sensing line (where its current tick mark sits under test) for one // extra 600ms after motion resumes — a rarer "this one got a second look" // variant that still resolves and never latches. // // prefers-reduced-motion renders the single most-structured frame directly // (no rAF loop at all): drums stopped at their phase-staggered rest // offsets, sensing bar at peak 90% opacity — the mid-hold instant, not a // mid-scroll blur. // --------------------------------------------------------------------------- // Rendered scan speed is a decoupled rate, not the historical one: the real // Bombe tested on the order of hundreds of rotor-hypotheses/s, far above // anything that reads as motion (rather than noise/strobe) on a 60Hz // screen. 180px/s here is a visually smooth continuous scroll — roughly 13 // tick-marks/s at the default tick spacing — chosen the same way round-9's // rate-decoupling rule chose a slow sweep over a literal 180marks/s // (2520px/s), which would alias against 60Hz paint exactly like the strobe // bug that rule was written for. const SCROLL_SPEED_PX_S = 180; const STRIP_TICKS = 26; // one revolution = 26 rotor-letter positions const DRUM_COUNT = 4; const PHASE_STEP_S = 0.6; // drum N starts N*0.6s "ahead" of drum 0 const HALT_MIN_S = 4; const HALT_MAX_S = 6; const DECEL_MS = 180; const HOLD_MS = 900; const REACCEL_MS = 220; const RING_CHANCE = 0.15; const RING_MS = 600; const SENSING_BAR_Y_RATIO = 0.42; // fixed height across drums, fraction of drum height const BAR_IDLE_OPACITY = 0.2; const BAR_PEAK_OPACITY = 0.9; type Phase = "scan" | "decel" | "hold" | "reaccel"; function easeInOutCubic(t: number): number { return t < 0.5 ? 4 * t * t * t : 1 - Math.pow(-2 * t + 2, 3) / 2; } interface Tick { top: number; height: number; opacity: number; } /** Builds `repeats` back-to-back 26-position revolutions of tick marks — * a datum mark every 26th position, a heavier mark every 5th, a plain tick * otherwise — so the drum window always has enough rendered strip above * and below the visible offset range to cover a full modulo sweep. */ function buildTicks(tickPeriod: number, repeats: number): Tick[] { const ticks: Tick[] = []; const total = STRIP_TICKS * repeats; for (let i = 0; i < total; i++) { const pos = i % STRIP_TICKS; const isDatum = pos === 0; const isHeavy = pos % 5 === 0; ticks.push({ top: i * tickPeriod, height: isDatum ? tickPeriod * 0.32 : isHeavy ? tickPeriod * 0.22 : tickPeriod * 0.14, opacity: isDatum ? 0.9 : isHeavy ? 0.68 : 0.45, }); } return ticks; } export interface BombeDrumHaltProps { /** accessible label for the ambient search/loading status */ label?: string; /** extra classes merged onto the rendered root element */ className?: string; } export function BombeDrumHalt({ label = "Searching", className = "" }: BombeDrumHaltProps) { const rootRef = useRef(null); const drumRefs = useRef<(HTMLDivElement | null)[]>([]); const ringRefs = useRef<(HTMLDivElement | null)[]>([]); const barRef = useRef(null); const [smaller, setSmaller] = useState(0); useEffect(() => { const root = rootRef.current; if (!root) return; const ro = new ResizeObserver((entries) => { const entry = entries[0]; if (!entry) return; const { width, height } = entry.contentRect; setSmaller(Math.min(width, height)); }); ro.observe(root); return () => ro.disconnect(); }, []); // Geometry derives from the container's smaller dimension so the // component reads at card scale regardless of aspect ratio. const drumWidth = smaller > 0 ? smaller / 9 : 0; const drumHeight = smaller > 0 ? smaller * 0.85 : 0; const tickPeriod = drumHeight > 0 ? Math.max(4, drumHeight / 45) : 4; const stripLength = STRIP_TICKS * tickPeriod; const repeats = drumHeight > 0 ? Math.max(3, Math.ceil((drumHeight + stripLength) / stripLength) + 1) : 3; const ticks = useMemo( () => (drumHeight > 0 ? buildTicks(tickPeriod, repeats) : []), [tickPeriod, repeats, drumHeight] ); useEffect(() => { if (drumWidth <= 0 || drumHeight <= 0) return; const reduced = window.matchMedia("(prefers-reduced-motion: reduce)").matches; // accumulated scroll offset per drum, px, seeded by the phase stagger const positions = Array.from( { length: DRUM_COUNT }, (_, i) => i * PHASE_STEP_S * SCROLL_SPEED_PX_S ); const applyDrumTransform = (i: number) => { const el = drumRefs.current[i]; if (!el) return; const offset = ((positions[i] ?? 0) % stripLength + stripLength) % stripLength; el.style.transform = `translateY(${-offset}px)`; }; const setBarOpacity = (v: number) => { const el = barRef.current; if (el) el.style.opacity = String(v); }; const setRing = (drum: number, opacity: number) => { ringRefs.current.forEach((el, i) => { if (el) el.style.opacity = i === drum ? String(opacity) : "0"; }); }; if (reduced) { // freeze on the mid-hold instant: drums stopped, bar at peak brightness positions.forEach((_, i) => applyDrumTransform(i)); setBarOpacity(BAR_PEAK_OPACITY); setRing(-1, 0); return; } let raf = 0; let visible = true; let last = 0; let phase: Phase = "scan"; let phaseStart = 0; let nextHaltAt = 0; let ringDrum = -1; let ringUntil = 0; const scheduleNextHalt = (now: number) => { nextHaltAt = now + (HALT_MIN_S + Math.random() * (HALT_MAX_S - HALT_MIN_S)) * 1000; }; const advance = (dt: number, speedFactor: number) => { const delta = (SCROLL_SPEED_PX_S * speedFactor * dt) / 1000; for (let i = 0; i < positions.length; i++) { positions[i] = (positions[i] ?? 0) + delta; } }; const tick = (now: number) => { raf = requestAnimationFrame(tick); if (!visible) return; if (last === 0) last = now; const dt = Math.min(100, now - last); last = now; if (phase === "scan") { if (nextHaltAt === 0) scheduleNextHalt(now); advance(dt, 1); if (ringDrum >= 0 && now >= ringUntil) { setRing(-1, 0); ringDrum = -1; } if (now >= nextHaltAt) { phase = "decel"; phaseStart = now; } } else if (phase === "decel") { const t = Math.min(1, (now - phaseStart) / DECEL_MS); advance(dt, 1 - easeInOutCubic(t)); setBarOpacity(BAR_IDLE_OPACITY + (BAR_PEAK_OPACITY - BAR_IDLE_OPACITY) * t); if (t >= 1) { phase = "hold"; phaseStart = now; } } else if (phase === "hold") { const t = Math.min(1, (now - phaseStart) / HOLD_MS); setBarOpacity(BAR_PEAK_OPACITY); if (t >= 1) { phase = "reaccel"; phaseStart = now; } } else if (phase === "reaccel") { const t = Math.min(1, (now - phaseStart) / REACCEL_MS); advance(dt, easeInOutCubic(t)); setBarOpacity(BAR_PEAK_OPACITY - (BAR_PEAK_OPACITY - BAR_IDLE_OPACITY) * t); if (t >= 1) { phase = "scan"; scheduleNextHalt(now); // false-positive resolve: 15% of halts leave a "second look" ring if (Math.random() < RING_CHANCE) { ringDrum = Math.floor(Math.random() * DRUM_COUNT); ringUntil = now + RING_MS; setRing(ringDrum, 0.4); } } } for (let i = 0; i < DRUM_COUNT; i++) applyDrumTransform(i); }; raf = requestAnimationFrame(tick); const io = new IntersectionObserver((entries) => { const wasVisible = visible; visible = entries[0]?.isIntersecting ?? true; if (visible && !wasVisible) { last = 0; // resync elapsed-time base on resume // A halt frozen mid-flight while offscreen has a stale phaseStart; // rather than resolve decel/hold/reaccel in one jumped frame, // treat the away period as invalidating it and resume scanning. if (phase !== "scan") { phase = "scan"; setBarOpacity(BAR_IDLE_OPACITY); setRing(-1, 0); ringDrum = -1; } scheduleNextHalt(performance.now()); } }); if (rootRef.current) io.observe(rootRef.current); return () => { cancelAnimationFrame(raf); io.disconnect(); }; }, [drumWidth, drumHeight, stripLength]); const drums = useMemo(() => Array.from({ length: DRUM_COUNT }, (_, i) => i), []); const ringInset = Math.max(1, drumWidth * 0.1); return (

{drums.map((i) => (

{ drumRefs.current[i] = el; }} className="absolute inset-x-0 top-0 will-change-transform" style={{ height: repeats * stripLength }} > {ticks.map((t, idx) => (

))}

{ ringRefs.current[i] = el; }} className="pointer-events-none absolute" style={{ left: ringInset, right: ringInset, top: drumHeight * SENSING_BAR_Y_RATIO - tickPeriod / 2, height: tickPeriod, border: "1px solid var(--foreground)", borderRadius: 1, opacity: 0, transition: "opacity 200ms ease", }} />

))}

); } 63:["$","div",null,{"className":"mt-3 flex min-h-0 min-w-0 flex-1 flex-col gap-3","children":[null,["$","$L64",null,{"files":[{"path":"registry/core/bombe-drum-halt/component.tsx","content":"$65","type":"registry:ui","target":"components/ui/bombe-drum-halt.tsx"}],"className":"h-[70svh] min-h-80"}]]}]