06Multi-Counter Status That Distributes by a Calculated Per-Window Rate

<main class="stage">
<div class="wmc is-demo" id="wmcRoot">
  <ul class="wmc__list" id="wmcList" role="list"></ul>
  <p class="wmc__status" id="wmcStatus" aria-live="polite"></p>
  <div class="wmc__controls">
    <button type="button" class="wmc__btn wmc__btn--primary" id="wmcNext">Process next</button>
    <button type="button" class="wmc__btn" id="wmcReset">Reset</button>
  </div>
</div>
</main>

@use "../../../../site/static/demo-tokens" as *;

// 핵심: 창구마다 처리 로그 평균(분)을 계산해 막대 길이(빠를수록 김)를 이징 트윈으로 채우고,
// 세 창구 중 평균이 가장 짧은 창구를 매 계산마다 다시 판정해 은은한 발광 클래스를 켠다.

@include stage($stage-yellow);

.wmc {
  position: relative;
  display: grid;
  gap: $sp-3;
  justify-items: center;
  width: min(92vw, 320px);
}

.wmc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: $sp-2;
  width: 100%;
}

.wmc__row {
  display: grid;
  grid-template-columns: 56px 1fr;
  align-items: center;
  gap: $sp-2;
  padding: $sp-2 $sp-3;
  border-radius: $r-sm;
  background: rgba($stage-paper, .55);
  transition: box-shadow $dur-base $ease-out;
}

.wmc__row.is-fastest {
  box-shadow: 0 0 0 1px rgba($subject-orange-deep, .35), 0 0 16px rgba($subject-orange-deep, .28);
}

.wmc__label {
  font-size: 11px;
  font-weight: 700;
  color: $stage-ink;
  grid-row: 1 / 3;
}

.wmc__track {
  height: 8px;
  border-radius: $r-pill;
  background: rgba($stage-ink, .12);
  overflow: hidden;
}

.wmc__bar {
  height: 100%;
  border-radius: $r-pill;
  background: $subject-orange-deep;
}

.wmc__row.is-fastest .wmc__bar { background: $tick-up; }

.wmc__meta {
  font-size: 10px;
  font-weight: 600;
  color: rgba($stage-ink, .65);
}

.wmc__status {
  margin: 0;
  font-size: 11px;
  font-weight: 600;
  color: rgba($stage-ink, .78);
  text-align: center;
}

.wmc__controls {
  display: flex;
  gap: $sp-2;
}

.wmc__btn {
  border: 1px solid rgba($stage-ink, .3);
  background: transparent;
  color: $stage-ink;
  border-radius: $r-control;
  padding: $sp-2 $sp-4;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}

.wmc__btn--primary {
  background: $subject-orange-deep;
  border-color: $subject-orange-deep;
  color: $stage-paper;
}

.wmc__btn:focus-visible {
  outline: 2px solid $subject-orange-deep;
  outline-offset: 2px;
}

@media (max-width: 340px) {
  .wmc__row { grid-template-columns: 46px 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .wmc__bar { transition: none; }
  .wmc__row { transition: none; }
}

// 화면 높이가 낮을 때 줄을 촘촘하게 — 예고 없이 스크롤바가 생기지 않게 한다.
.wmc__list { gap: $sp-1; }
.wmc__row { padding-top: $sp-1; padding-bottom: $sp-1; }

@media (max-height: 240px) {
  .wmc { gap: $sp-2; }
  .wmc__row { padding-top: 0; padding-bottom: 0; min-height: 24px; }
  .wmc__status { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
  .wmc__btn { padding-top: $sp-1; padding-bottom: $sp-1; }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffd23f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.wmc {
  position: relative;
  display: grid;
  gap: 12px;
  justify-items: center;
  width: min(92vw, 320px);
}

.wmc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
  width: 100%;
}

.wmc__row {
  display: grid;
  grid-template-columns: 56px 1fr;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.55);
  transition: box-shadow 300ms ease-out;
}

.wmc__row.is-fastest {
  box-shadow: 0 0 0 1px rgba(201, 48, 0, 0.35), 0 0 16px rgba(201, 48, 0, 0.28);
}

.wmc__label {
  font-size: 11px;
  font-weight: 700;
  color: #17141a;
  grid-row: 1/3;
}

.wmc__track {
  height: 8px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.12);
  overflow: hidden;
}

.wmc__bar {
  height: 100%;
  border-radius: 999px;
  background: #c93000;
}

.wmc__row.is-fastest .wmc__bar {
  background: #3ddc97;
}

.wmc__meta {
  font-size: 10px;
  font-weight: 600;
  color: rgba(23, 20, 26, 0.65);
}

.wmc__status {
  margin: 0;
  font-size: 11px;
  font-weight: 600;
  color: rgba(23, 20, 26, 0.78);
  text-align: center;
}

.wmc__controls {
  display: flex;
  gap: 8px;
}

.wmc__btn {
  border: 1px solid rgba(23, 20, 26, 0.3);
  background: transparent;
  color: #17141a;
  border-radius: 12px;
  padding: 8px 16px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}

.wmc__btn--primary {
  background: #c93000;
  border-color: #c93000;
  color: #ffffff;
}

.wmc__btn:focus-visible {
  outline: 2px solid #c93000;
  outline-offset: 2px;
}

@media (max-width: 340px) {
  .wmc__row {
    grid-template-columns: 46px 1fr;
  }
}
@media (prefers-reduced-motion: reduce) {
  .wmc__bar {
    transition: none;
  }
  .wmc__row {
    transition: none;
  }
}
.wmc__list {
  gap: 4px;
}

.wmc__row {
  padding-top: 4px;
  padding-bottom: 4px;
}

@media (max-height: 240px) {
  .wmc {
    gap: 8px;
  }
  .wmc__row {
    padding-top: 0;
    padding-bottom: 0;
    min-height: 24px;
  }
  .wmc__status {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
  }
  .wmc__btn {
    padding-top: 4px;
    padding-bottom: 4px;
  }
}

(function () {
  // 기법: 창구마다 Served 로그(min)를 따로 쌓아 평균 속도를 계산하고, 그 평균으로 다음 예상 Served
  // 시각(min away)을 계산해 표시한다. 막대 길이는 평균 속도(빠를수록 김)를 계산해 트윈으로 채우고,
  // 세 창구 중 평균이 가장 짧은(=가장 빠른) 창구를 매 계산마다 다시 골라 은은하게 빛낸다.
  var BAR_TWEEN_MS = 420;
  var SERVICE_LOG_MAX = 8;

  function seedRand(seed) {
    var s = seed >>> 0;
    return function () { s = (s * 1664525 + 1013904223) >>> 0; return s / 4294967296; };
  }
  function easeOutCubic(t) { return 1 - Math.pow(1 - t, 3); }

  var COUNTERS = [
    { id: 'a', label: 'Window 1', seed: 434061, base: 2.4 },
    { id: 'b', label: 'Window 2', seed: 434062, base: 3.6 },
    { id: 'c', label: 'Window 3', seed: 434063, base: 3.0 }
  ];

  COUNTERS.forEach(function (c) {
    c.rand = seedRand(c.seed);
    c.log = [];
    c.processed = 0;
    c.shownRatio = 0;
    c.anim = 0;
    for (var i = 0; i < 4; i += 1) c.log.push(c.base + c.rand() * 1.4);
  });

  var root = document.getElementById('wmcRoot');
  var listEl = document.getElementById('wmcList');
  var status = document.getElementById('wmcStatus');
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  if (reduce) root.classList.remove('is-demo');

  var rows = {};
  COUNTERS.forEach(function (c) {
    var li = document.createElement('li');
    li.className = 'wmc__row';
    li.id = 'wmcRow-' + c.id;
    li.innerHTML =
      '<span class="wmc__label">' + c.label + '</span>' +
      '<div class="wmc__track" aria-hidden="true"><div class="wmc__bar" id="wmcBar-' + c.id + '"></div></div>' +
      '<span class="wmc__meta" id="wmcMeta-' + c.id + '" aria-hidden="true"></span>';
    listEl.appendChild(li);
    rows[c.id] = li;
  });

  function avgMinutes(c) {
    if (c.log.length === 0) return 0;
    var sum = 0;
    for (var i = 0; i < c.log.length; i += 1) sum += c.log[i];
    return sum / c.log.length;
  }

  function maxAvg() {
    var m = 0.0001;
    COUNTERS.forEach(function (c) { m = Math.max(m, avgMinutes(c)); });
    return m;
  }

  function fastestId() {
    var best = COUNTERS[0];
    COUNTERS.forEach(function (c) { if (avgMinutes(c) < avgMinutes(best)) best = c; });
    return best.id;
  }

  function paintMeta(c) {
    var avg = avgMinutes(c);
    var metaEl = document.getElementById('wmcMeta-' + c.id);
    metaEl.textContent = c.processed + ' served · next est. ' + avg.toFixed(1) + 'min away';
  }

  function paintFastest() {
    var fid = fastestId();
    COUNTERS.forEach(function (c) {
      rows[c.id].classList.toggle('is-fastest', c.id === fid);
    });
  }

  function tweenBar(c) {
    if (c.anim) cancelAnimationFrame(c.anim);
    var barEl = document.getElementById('wmcBar-' + c.id);
    var mx = maxAvg();
    var to = 1 - Math.min(1, avgMinutes(c) / mx) * 0.7;
    var from = c.shownRatio;
    if (reduce) { c.shownRatio = to; barEl.style.width = (to * 100).toFixed(1) + '%'; return; }
    var start = 0;
    function step(ts) {
      if (start === 0) start = ts;
      var t = Math.min(1, (ts - start) / BAR_TWEEN_MS);
      var e = easeOutCubic(t);
      var v = from + (to - from) * e;
      c.shownRatio = v;
      barEl.style.width = (v * 100).toFixed(1) + '%';
      if (t < 1) { c.anim = requestAnimationFrame(step); } else { c.anim = 0; }
    }
    c.anim = requestAnimationFrame(step);
  }

  function recalcAll() {
    COUNTERS.forEach(function (c) { tweenBar(c); paintMeta(c); });
    paintFastest();
  }

  var turnIndex = 0;
  function processNext() {
    var c = COUNTERS[turnIndex % COUNTERS.length];
    turnIndex += 1;
    c.log.push(c.base + c.rand() * 1.4);
    if (c.log.length > SERVICE_LOG_MAX) c.log.shift();
    c.processed += 1;
    recalcAll();
    status.textContent = c.label + ' ' + c.processed + 'th served · next est. ' + avgMinutes(c).toFixed(1) + 'min away.';
  }

  function resetAll() {
    turnIndex = 0;
    COUNTERS.forEach(function (c) {
      c.rand = seedRand(c.seed);
      c.log = [];
      c.processed = 0;
      for (var i = 0; i < 4; i += 1) c.log.push(c.base + c.rand() * 1.4);
    });
    recalcAll();
    status.textContent = 'Window statuses have been reset.';
  }

  var nextBtn = document.getElementById('wmcNext');
  var resetBtn = document.getElementById('wmcReset');

  function onNext() { root.classList.remove('is-demo'); processNext(); }
  function onReset() { root.classList.remove('is-demo'); resetAll(); }

  nextBtn.addEventListener('click', onNext);
  nextBtn.addEventListener('keydown', function (e) {
    if (e.key === 'Enter' || e.key === ' ') { e.preventDefault(); onNext(); }
  });
  resetBtn.addEventListener('click', onReset);
  resetBtn.addEventListener('keydown', function (e) {
    if (e.key === 'Enter' || e.key === ' ') { e.preventDefault(); onReset(); }
  });

  var demoSchedule = [200, 1200];
  var demoIndex = 0;
  var t0 = null;
  function tick(ts) {
    if (t0 === null) t0 = ts;
    var now = ts - t0;
    if (!reduce && root.classList.contains('is-demo') && demoIndex < demoSchedule.length && now >= demoSchedule[demoIndex]) {
      processNext();
      demoIndex += 1;
      if (demoIndex >= demoSchedule.length) {
        demoIndex = 0;
        demoSchedule = demoSchedule.map(function (v) { return v + now + 2000; });
      }
    }
    requestAnimationFrame(tick);
  }

  recalcAll();
  status.textContent = 'Three windows\' service rates are calculated to show the next estimated times.';
  requestAnimationFrame(tick);
})();

// WaitingQueueMultiCounterDistribution — vanilla 판(06-waiting-queue-multi-counter-distribution) 의
// React 포트. 창구마다 처리 로그 평균(분)을 계산해 막대 길이를 이징 트윈으로 채우고, 가장 빠른
// 창구를 매 계산마다 다시 판정해 은은한 발광을 켠다.
import { useEffect, useRef, useState } from "react";
import styles from "./WaitingQueueMultiCounterDistribution.module.scss";

type Box<T> = { current: T };

const BAR_TWEEN_MS = 420;
const SERVICE_LOG_MAX = 8;

function seedRand(seed: number): () => number {
  let s = seed >>> 0;
  return function () { s = (s * 1664525 + 1013904223) >>> 0; return s / 4294967296; };
}
function easeOutCubic(t: number): number { return 1 - Math.pow(1 - t, 3); }

type Counter = {
  id: string;
  label: string;
  seed: number;
  base: number;
  rand: () => number;
  log: number[];
  processed: number;
  shownRatio: number;
  anim: number;
};

function makeCounters(): Counter[] {
  const defs = [
    { id: "a", label: "1번 창구", seed: 434061, base: 2.4 },
    { id: "b", label: "2번 창구", seed: 434062, base: 3.6 },
    { id: "c", label: "3번 창구", seed: 434063, base: 3.0 }
  ];
  return defs.map((d) => {
    const rand = seedRand(d.seed);
    const log: number[] = [];
    for (let i = 0; i < 4; i += 1) log.push(d.base + rand() * 1.4);
    return { ...d, rand, log, processed: 0, shownRatio: 0, anim: 0 };
  });
}

function avgMinutes(c: Counter): number {
  if (c.log.length === 0) return 0;
  let sum = 0;
  for (let i = 0; i < c.log.length; i += 1) sum += c.log[i];
  return sum / c.log.length;
}

export default function WaitingQueueMultiCounterDistribution() {
  const countersRef = useRef<Counter[]>(makeCounters()) as Box<Counter[]>;
  const [, forceTick] = useState(0);
  const [barPct, setBarPct] = useState<Record<string, number>>({ a: 0, b: 0, c: 0 });
  const [meta, setMeta] = useState<Record<string, string>>({ a: "", b: "", c: "" });
  const [fastestId, setFastestId] = useState("a");
  const [status, setStatus] = useState("창구 3곳의 처리 속도를 계산해 다음 예상 시각을 보여줍니다.");
  const [reduce, setReduce] = useState(false);
  const demoRef = useRef<boolean>(true) as Box<boolean>;
  const turnRef = useRef<number>(0) as Box<number>;
  const demoIndexRef = useRef<number>(0) as Box<number>;
  const demoScheduleRef = useRef<number[]>([200, 1200]) as Box<number[]>;
  const frameRef = useRef<number>(0) as Box<number>;

  useEffect(() => {
    setReduce(window.matchMedia("(prefers-reduced-motion: reduce)").matches);
  }, []);

  function maxAvg(): number {
    let m = 0.0001;
    countersRef.current.forEach((c) => { m = Math.max(m, avgMinutes(c)); });
    return m;
  }

  function calcFastestId(): string {
    const cs = countersRef.current;
    let best = cs[0];
    cs.forEach((c) => { if (avgMinutes(c) < avgMinutes(best)) best = c; });
    return best.id;
  }

  function tweenBar(c: Counter): void {
    if (c.anim) cancelAnimationFrame(c.anim);
    const mx = maxAvg();
    const to = 1 - Math.min(1, avgMinutes(c) / mx) * 0.7;
    const from = c.shownRatio;
    if (reduce) {
      c.shownRatio = to;
      setBarPct((p) => ({ ...p, [c.id]: to * 100 }));
      return;
    }
    let start = 0;
    function step(ts: number): void {
      if (start === 0) start = ts;
      const t = Math.min(1, (ts - start) / BAR_TWEEN_MS);
      const e = easeOutCubic(t);
      const v = from + (to - from) * e;
      c.shownRatio = v;
      setBarPct((p) => ({ ...p, [c.id]: v * 100 }));
      if (t < 1) { c.anim = requestAnimationFrame(step); } else { c.anim = 0; }
    }
    c.anim = requestAnimationFrame(step);
  }

  function recalcAll(): void {
    const cs = countersRef.current;
    cs.forEach((c) => {
      tweenBar(c);
      setMeta((p) => ({ ...p, [c.id]: c.processed + "명 처리 · 다음 예상 " + avgMinutes(c).toFixed(1) + "분 뒤" }));
    });
    setFastestId(calcFastestId());
  }

  function processNext(): void {
    const cs = countersRef.current;
    const c = cs[turnRef.current % cs.length];
    turnRef.current += 1;
    c.log.push(c.base + c.rand() * 1.4);
    if (c.log.length > SERVICE_LOG_MAX) c.log.shift();
    c.processed += 1;
    recalcAll();
    setStatus(c.label + " " + c.processed + "명째 처리 · 다음 예상 " + avgMinutes(c).toFixed(1) + "분 뒤.");
    forceTick((n) => n + 1);
  }

  function resetAll(): void {
    turnRef.current = 0;
    countersRef.current = makeCounters();
    recalcAll();
    setStatus("창구 현황을 초기화했습니다.");
    forceTick((n) => n + 1);
  }

  function stopDemo(): void { demoRef.current = false; }

  useEffect(() => {
    recalcAll();
    let t0 = 0;
    function tick(ts: number): void {
      if (t0 === 0) t0 = ts;
      const now = ts - t0;
      const sched = demoScheduleRef.current;
      if (!reduce && demoRef.current && demoIndexRef.current < sched.length && now >= sched[demoIndexRef.current]) {
        processNext();
        demoIndexRef.current += 1;
        if (demoIndexRef.current >= sched.length) {
          demoIndexRef.current = 0;
          demoScheduleRef.current = sched.map((v) => v + now + 2000);
        }
      }
      frameRef.current = requestAnimationFrame(tick);
    }
    frameRef.current = requestAnimationFrame(tick);
    return () => cancelAnimationFrame(frameRef.current);
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [reduce]);

  function onNext(): void { stopDemo(); processNext(); }
  function onReset(): void { stopDemo(); resetAll(); }

  function onKeyDown(e: { key: string; preventDefault: () => void }, fn: () => void): void {
    if (e.key === "Enter" || e.key === " ") { e.preventDefault(); fn(); }
  }

  return (
    <main className={styles.stage}>
      <div className={styles.wmc}>
        <ul className={styles.list} role="list">
          {countersRef.current.map((c) => (
            <li key={c.id} className={[styles.row, c.id === fastestId ? styles.rowFastest : ""].join(" ")}>
              <span className={styles.label}>{c.label}</span>
              <div className={styles.track} aria-hidden="true"><div className={styles.bar} style={{ width: (barPct[c.id] || 0) + "%" }} /></div>
              <span className={styles.meta} aria-hidden="true">{meta[c.id]}</span>
            </li>
          ))}
        </ul>
        <p className={styles.status} aria-live="polite">{status}</p>
        <div className={styles.controls}>
          <button type="button" className={[styles.btn, styles.btnPrimary].join(" ")} onClick={onNext} onKeyDown={(e: { key: string; preventDefault: () => void }) => onKeyDown(e, onNext)}>다음 처리</button>
          <button type="button" className={styles.btn} onClick={onReset} onKeyDown={(e: { key: string; preventDefault: () => void }) => onKeyDown(e, onReset)}>초기화</button>
        </div>
      </div>
    </main>
  );
}