09여러 계산을 한 화면에 모은 대기 순번판 히어로 장면

<main class="stage">
<div class="whb is-demo" id="whbRoot">
  <div class="whb__head">
    <div class="whb__odometer" id="whbCallOdo" aria-hidden="true"></div>
    <div class="whb__countWrap" aria-hidden="true">
      <div class="whb__odometer whb__odometer--small" id="whbTotalOdo"></div>
      <span class="whb__countUnit">명 대기중</span>
    </div>
  </div>
  <ul class="whb__list" id="whbList" role="list"></ul>
  <p class="whb__status" id="whbStatus" aria-live="polite"></p>
  <div class="whb__controls">
    <button type="button" class="whb__btn whb__btn--primary" id="whbCall">다음 호출</button>
    <button type="button" class="whb__btn" id="whbJoin">입장</button>
    <button type="button" class="whb__btn" id="whbReset">초기화</button>
  </div>
</div>
</main>

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

// 핵심(합성): 호출 번호 릴(01) · 목록 FLIP 스프링(04) · 인원 카운터 릴+플래시(07) 가
// 하나의 호출 계산으로 동시에 움직이는 히어로 장면.

@include stage($stage-ink);

.whb {
  position: relative;
  display: grid;
  gap: $sp-3;
  justify-items: center;
  width: min(94vw, 340px);
}

.whb__head {
  display: flex;
  align-items: center;
  gap: $sp-4;
}

.whb__odometer {
  display: flex;
  gap: $sp-1;
  font-variant-numeric: tabular-nums;
}

.whb__digit {
  position: relative;
  width: 34px;
  height: 50px;
  overflow: hidden;
  border-radius: $r-xs;
  background: rgba($stage-paper, .08);
}

.whb__reel {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
}

.whb__reel i {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 50px;
  font-style: normal;
  font-size: 32px;
  font-weight: 700;
  color: $subject-blue-light;
}

.whb__odometer--small .whb__digit {
  width: 22px;
  height: 32px;
}

.whb__odometer--small .whb__reel i {
  height: 32px;
  font-size: 20px;
  color: $stage-paper;
}

.whb__countWrap {
  display: flex;
  align-items: center;
  gap: $sp-1;
  padding: $sp-1 $sp-2;
  border-radius: $r-sm;
  transition: background $dur-quick $ease-out, box-shadow $dur-quick $ease-out;
}

.whb__countWrap.is-up {
  background: rgba($tick-up, .2);
  box-shadow: 0 0 0 1px rgba($tick-up, .4);
}

.whb__countWrap.is-down {
  background: rgba($tick-down, .18);
  box-shadow: 0 0 0 1px rgba($tick-down, .4);
}

.whb__countUnit {
  font-size: 11px;
  font-weight: 600;
  color: rgba($stage-paper, .72);
}

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

.whb__item {
  display: grid;
  grid-template-columns: 64px 1fr;
  align-items: center;
  gap: $sp-2;
  padding: $sp-2 $sp-3;
  border-radius: $r-sm;
  background: rgba($stage-paper, .07);
  box-sizing: border-box;
}

.whb__item.is-next {
  background: rgba($subject-blue-deep, .18);
  outline: 1.5px solid $subject-blue-deep;
  transform: scale(1.02);
}

.whb__ticket {
  font-size: 13px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: $stage-paper;
}

.whb__note {
  font-size: 11px;
  font-weight: 600;
  color: rgba($stage-paper, .6);
}

.whb__status {
  margin: 0;
  font-size: 11px;
  font-weight: 600;
  color: rgba($stage-paper, .7);
}

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

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

.whb__btn--primary {
  background: $subject-blue-deep;
  border-color: $subject-blue-deep;
  color: $stage-paper;
}

.whb__btn:focus-visible {
  outline: 2px solid $subject-blue-light;
  outline-offset: 2px;
}

@media (max-width: 340px) {
  .whb__digit { width: 26px; height: 40px; }
  .whb__reel i { height: 40px; font-size: 26px; }
  .whb__odometer--small .whb__digit { width: 18px; height: 26px; }
  .whb__odometer--small .whb__reel i { height: 26px; font-size: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  .whb__reel { transition: none; }
  .whb__countWrap { transition: none; }
  .whb__item { transition: none; }
}

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

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

@media (max-height: 240px) {
  .whb__item { min-height: 20px; }
  .whb__digit { height: 32px; }
  .whb__reel i { height: 32px; font-size: 22px; }
}

// 접수가 늘어 줄이 한 줄 더 생겨도 보드가 커지지 않게 — 보이는 줄 수를 고정한다.
.whb__list { max-height: 112px; overflow: hidden; }

@media (max-height: 240px) {
  .whb__list { max-height: 96px; }
}

// 언어마다 글자 길이가 달라도 버튼·상태 줄이 줄바꿈으로 키를 늘리지 않게 한다.
.whb__btn { white-space: nowrap; padding-left: $sp-2; padding-right: $sp-2; }
.whb__status { white-space: nowrap; }

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.whb {
  position: relative;
  display: grid;
  gap: 12px;
  justify-items: center;
  width: min(94vw, 340px);
}

.whb__head {
  display: flex;
  align-items: center;
  gap: 16px;
}

.whb__odometer {
  display: flex;
  gap: 4px;
  font-variant-numeric: tabular-nums;
}

.whb__digit {
  position: relative;
  width: 34px;
  height: 50px;
  overflow: hidden;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.08);
}

.whb__reel {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
}

.whb__reel i {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 50px;
  font-style: normal;
  font-size: 32px;
  font-weight: 700;
  color: #5b8cf8;
}

.whb__odometer--small .whb__digit {
  width: 22px;
  height: 32px;
}

.whb__odometer--small .whb__reel i {
  height: 32px;
  font-size: 20px;
  color: #ffffff;
}

.whb__countWrap {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  border-radius: 8px;
  transition: background 220ms ease-out, box-shadow 220ms ease-out;
}

.whb__countWrap.is-up {
  background: rgba(61, 220, 151, 0.2);
  box-shadow: 0 0 0 1px rgba(61, 220, 151, 0.4);
}

.whb__countWrap.is-down {
  background: rgba(255, 122, 94, 0.18);
  box-shadow: 0 0 0 1px rgba(255, 122, 94, 0.4);
}

.whb__countUnit {
  font-size: 11px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.72);
}

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

.whb__item {
  display: grid;
  grid-template-columns: 64px 1fr;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.07);
  box-sizing: border-box;
}

.whb__item.is-next {
  background: rgba(10, 79, 232, 0.18);
  outline: 1.5px solid #0a4fe8;
  transform: scale(1.02);
}

.whb__ticket {
  font-size: 13px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: #ffffff;
}

.whb__note {
  font-size: 11px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.6);
}

.whb__status {
  margin: 0;
  font-size: 11px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.7);
}

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

.whb__btn {
  border: 1px solid rgba(255, 255, 255, 0.3);
  background: transparent;
  color: #ffffff;
  border-radius: 12px;
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}

.whb__btn--primary {
  background: #0a4fe8;
  border-color: #0a4fe8;
  color: #ffffff;
}

.whb__btn:focus-visible {
  outline: 2px solid #5b8cf8;
  outline-offset: 2px;
}

@media (max-width: 340px) {
  .whb__digit {
    width: 26px;
    height: 40px;
  }
  .whb__reel i {
    height: 40px;
    font-size: 26px;
  }
  .whb__odometer--small .whb__digit {
    width: 18px;
    height: 26px;
  }
  .whb__odometer--small .whb__reel i {
    height: 26px;
    font-size: 16px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .whb__reel {
    transition: none;
  }
  .whb__countWrap {
    transition: none;
  }
  .whb__item {
    transition: none;
  }
}
.whb__list {
  gap: 4px;
}

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

@media (max-height: 240px) {
  .whb {
    gap: 8px;
  }
  .whb__item {
    padding-top: 0;
    padding-bottom: 0;
    min-height: 24px;
  }
  .whb__status {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
  }
  .whb__btn {
    padding-top: 4px;
    padding-bottom: 4px;
  }
}
@media (max-height: 240px) {
  .whb__item {
    min-height: 20px;
  }
  .whb__digit {
    height: 32px;
  }
  .whb__reel i {
    height: 32px;
    font-size: 22px;
  }
}
.whb__list {
  max-height: 112px;
  overflow: hidden;
}

@media (max-height: 240px) {
  .whb__list {
    max-height: 96px;
  }
}
.whb__btn {
  white-space: nowrap;
  padding-left: 8px;
  padding-right: 8px;
}

.whb__status {
  white-space: nowrap;
}

(function () {
  // 기법(합성): HERO_CALL_ROLL_MS 호출 번호 굴림(01) + HERO_LIST_SPRING_STIFFNESS 목록 자리 이동(04)
  // + HERO_COUNT_ROLL_MS 전체 인원 카운터(07) 를 한 화면에서 같은 호출 하나로 동시에 계산한다.
  // 호출되면: 맨 앞 행이 접히며 사라지고(04), 뒤 행들이 스프링 감쇠로 올라오고(04), 호출 번호가
  // 굴러가고(01), 대기 인원이 그 차이만큼 굴러 내려간다(07). 입장 버튼은 인원만 올린다(07).
  var HERO_CALL_ROLL_MS = 480;
  var HERO_DIGIT_STAGGER_MS = 70;
  var HERO_COUNT_ROLL_MS = 420;
  var HERO_LIST_SPRING_STIFFNESS = 260;
  var HERO_FLASH_MS = 520;
  var SPRING_SETTLE_EASING = 'linear(0.0, 0.051, 0.176, 0.341, 0.518, 0.685, 0.831, 0.947, 1.032, 1.087, 1.117, 1.126, 1.121, 1.105, 1.085, 1.062, 1.041, 1.022, 1.008, 0.997, 1)';

  function seedRand(seed) {
    var s = seed >>> 0;
    return function () { s = (s * 1664525 + 1013904223) >>> 0; return s / 4294967296; };
  }
  var rand = seedRand(434091);

  function easeInOutCubic(t) { return t < 0.5 ? 4 * t * t * t : 1 - Math.pow(-2 * t + 2, 3) / 2; }

  function shiftDuration(gapPx) {
    return Math.round(60 + 100000 / HERO_LIST_SPRING_STIFFNESS + Math.min(240, gapPx * 0.55));
  }

  var HERO_CALL_BASE = 501;
  var HERO_TOTAL_START = 18;
  var HERO_ROWS_START = [
    { id: 'h1', ticket: '501번', note: '대기 2분' },
    { id: 'h2', ticket: '502번', note: '대기 6분' },
    { id: 'h3', ticket: '503번', note: '대기 11분' },
    { id: 'h4', ticket: '504번', note: '대기 15분' },
    { id: 'h5', ticket: '505번', note: '대기 19분' }
  ];

  var root = document.getElementById('whbRoot');
  var callOdo = document.getElementById('whbCallOdo');
  var totalOdo = document.getElementById('whbTotalOdo');
  var listEl = document.getElementById('whbList');
  var status = document.getElementById('whbStatus');
  var countWrap = document.querySelector('.whb__countWrap');
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  if (reduce) root.classList.remove('is-demo');

  var callNum = HERO_CALL_BASE;
  var frontIndex = 0;
  var total = HERO_TOTAL_START;
  var nextTicket = 506;

  // ---- (01/07 공용) 자릿수 릴 ----
  function buildOdometer(container, digitCount) {
    container.innerHTML = '';
    var digits = [];
    for (var i = 0; i < digitCount; i += 1) {
      var d = document.createElement('div');
      d.className = 'whb__digit';
      var reel = document.createElement('div');
      reel.className = 'whb__reel';
      d.appendChild(reel);
      container.appendChild(d);
      digits.push({ el: d, reel: reel, value: 0, from: 0, to: 0, start: 0, dur: 0 });
    }
    return digits;
  }

  var callDigits = buildOdometer(callOdo, 3);
  var totalDigits = buildOdometer(totalOdo, 2);

  function paintReel(digit, value) {
    var reel = digit.reel;
    if (reel.childElementCount !== 10) {
      reel.innerHTML = '';
      for (var n = 0; n < 10; n += 1) {
        var i = document.createElement('i');
        i.textContent = String(n);
        reel.appendChild(i);
      }
    }
    reel.style.transform = 'translateY(' + (-value * 10) + '%)';
  }

  function setDigitsImmediate(digits, num) {
    var s = String(num);
    while (s.length < digits.length) s = '0' + s;
    for (var i = 0; i < digits.length; i += 1) {
      var v = Number(s[i]);
      digits[i].value = v; digits[i].from = v; digits[i].to = v; digits[i].dur = 0;
      paintReel(digits[i], v);
    }
  }

  function rollDigits(digits, num, nowMs, rollMs) {
    if (reduce) { setDigitsImmediate(digits, num); return; }
    var s = String(num);
    while (s.length < digits.length) s = '0' + s;
    for (var i = 0; i < digits.length; i += 1) {
      var v = Number(s[i]);
      if (v === digits[i].to) continue;
      digits[i].from = digits[i].value;
      digits[i].to = v;
      digits[i].start = nowMs + i * HERO_DIGIT_STAGGER_MS;
      digits[i].dur = rollMs;
    }
  }

  function stepDigits(digits, nowMs) {
    for (var i = 0; i < digits.length; i += 1) {
      var d = digits[i];
      if (d.value === d.to && nowMs >= d.start) continue;
      if (nowMs < d.start) continue;
      var t = Math.min(1, (nowMs - d.start) / d.dur);
      var e = easeInOutCubic(t);
      var span = d.to - d.from;
      if (Math.abs(span) > 5) span = span > 0 ? span - 10 : span + 10;
      var cur = d.from + span * e;
      cur = ((cur % 10) + 10) % 10;
      d.value = t >= 1 ? d.to : cur;
      paintReel(d, cur);
    }
  }

  // ---- (07) 인원 플래시 ----
  var flashUntil = 0;
  function flashTotal(dir, nowMs) {
    countWrap.classList.remove('is-up', 'is-down');
    if (dir > 0) countWrap.classList.add('is-up');
    else if (dir < 0) countWrap.classList.add('is-down');
    flashUntil = nowMs + HERO_FLASH_MS;
  }

  // ---- (04) 목록 ----
  var rows = {};
  function fillRow(li, ticket, note) {
    var a = document.createElement('span');
    a.className = 'whb__ticket';
    a.textContent = ticket;
    var n = document.createElement('span');
    n.className = 'whb__note';
    n.textContent = note;
    li.appendChild(a);
    li.appendChild(n);
  }
  HERO_ROWS_START.forEach(function (r, i) {
    var li = document.createElement('li');
    li.className = 'whb__item' + (i === 0 ? ' is-next' : '');
    li.id = 'whbRow-' + r.id;
    fillRow(li, r.ticket, r.note);
    listEl.appendChild(li);
    rows[r.id] = li;
  });

  function paintNextClass() {
    var ids = Object.keys(rows);
    ids.forEach(function (id, i) {
      rows[id].classList.toggle('is-next', i === frontIndex);
    });
  }

  function callFront(nowMs) {
    var ids = Object.keys(rows);
    if (frontIndex >= ids.length) return;
    var id = ids[frontIndex];
    var el = rows[id];
    var gap = el.offsetHeight + 8;
    if (!reduce) {
      var h = el.offsetHeight;
      el.style.height = h + 'px';
      el.style.overflow = 'hidden';
      el.style.boxSizing = 'border-box';
      el.animate(
        [{ height: h + 'px', opacity: 1 }, { height: '0px', opacity: 0 }],
        { duration: 220, easing: 'ease-in', fill: 'forwards' }
      );
      var below = [];
      for (var i = frontIndex + 1; i < ids.length; i += 1) below.push(rows[ids[i]]);
      var dur = shiftDuration(gap);
      below.forEach(function (rEl) {
        rEl.animate(
          [{ transform: 'translateY(' + gap + 'px)' }, { transform: 'translateY(0px)' }],
          { duration: dur, delay: 0, easing: SPRING_SETTLE_EASING, fill: 'both' }
        );
      });
    }
    el.style.display = 'none';
    frontIndex += 1;

    // (01) 호출 번호 굴림 + (07) 인원 차이 계산
    var servedTicket = HERO_ROWS_START.concat(pendingRows)[0];
    void servedTicket;
    callNum = HERO_CALL_BASE + (HERO_ROWS_START.length - listVisibleCount());
    rollDigits(callDigits, callNum, nowMs, HERO_CALL_ROLL_MS);
    var nextTotal = Math.max(0, total - 1);
    var dir = nextTotal - total;
    total = nextTotal;
    rollDigits(totalDigits, total, nowMs, HERO_COUNT_ROLL_MS);
    flashTotal(dir, nowMs);
    paintNextClass();
    paintStatus();
  }

  var pendingRows = [];
  function listVisibleCount() {
    var ids = Object.keys(rows);
    var n = 0;
    ids.forEach(function (id) { if (rows[id].style.display !== 'none') n += 1; });
    return n;
  }

  function paintStatus() {
    status.textContent = '호출 ' + callNum + '번 · 대기 ' + total + '명';
  }

  function joinQueue(nowMs) {
    var ticket = nextTicket;
    nextTicket += 1;
    var id = 'j' + ticket;
    var li = document.createElement('li');
    li.className = 'whb__item';
    li.id = 'whbRow-' + id;
    fillRow(li, ticket + '번', '대기 접수');
    listEl.appendChild(li);
    rows[id] = li;
    if (!reduce) {
      li.animate(
        [{ opacity: 0, transform: 'translateY(6px)' }, { opacity: 1, transform: 'translateY(0px)' }],
        { duration: 240, easing: 'ease-out' }
      );
    }
    var nextTotal = Math.min(99, total + 1);
    var dir = nextTotal - total;
    total = nextTotal;
    rollDigits(totalDigits, total, nowMs, HERO_COUNT_ROLL_MS);
    flashTotal(dir, nowMs);
    paintStatus();
  }

  function resetAll(nowMs) {
    frontIndex = 0;
    total = HERO_TOTAL_START;
    callNum = HERO_CALL_BASE;
    nextTicket = 506;
    pendingRows = [];
    Object.keys(rows).forEach(function (id) {
      var el = rows[id];
      el.getAnimations().forEach(function (a) { a.cancel(); });
      el.remove();
      delete rows[id];
    });
    HERO_ROWS_START.forEach(function (r, i) {
      var li = document.createElement('li');
      li.className = 'whb__item' + (i === 0 ? ' is-next' : '');
      li.id = 'whbRow-' + r.id;
      fillRow(li, r.ticket, r.note);
      listEl.appendChild(li);
      rows[r.id] = li;
    });
    rollDigits(callDigits, callNum, nowMs, HERO_CALL_ROLL_MS);
    rollDigits(totalDigits, total, nowMs, HERO_COUNT_ROLL_MS);
    countWrap.classList.remove('is-up', 'is-down');
    paintStatus();
  }

  setDigitsImmediate(callDigits, HERO_CALL_BASE);
  setDigitsImmediate(totalDigits, HERO_TOTAL_START);
  paintStatus();

  var callBtn = document.getElementById('whbCall');
  var joinBtn = document.getElementById('whbJoin');
  var resetBtn = document.getElementById('whbReset');

  function onCall() { root.classList.remove('is-demo'); callFront(perfNow()); }
  function onJoin() { root.classList.remove('is-demo'); joinQueue(perfNow()); }
  function onReset() { root.classList.remove('is-demo'); resetAll(perfNow()); }

  callBtn.addEventListener('click', onCall);
  callBtn.addEventListener('keydown', function (e) { if (e.key === 'Enter' || e.key === ' ') { e.preventDefault(); onCall(); } });
  joinBtn.addEventListener('click', onJoin);
  joinBtn.addEventListener('keydown', function (e) { if (e.key === 'Enter' || e.key === ' ') { e.preventDefault(); onJoin(); } });
  resetBtn.addEventListener('click', onReset);
  resetBtn.addEventListener('keydown', function (e) { if (e.key === 'Enter' || e.key === ' ') { e.preventDefault(); onReset(); } });

  var t0 = null;
  function perfNow() { return t0 === null ? 0 : performance.now() - t0; }

  var demoSchedule = [200, 900, 1500];
  var demoIndex = 0;

  function tick(ts) {
    if (t0 === null) t0 = ts;
    var now = ts - t0;
    if (!reduce) {
      stepDigits(callDigits, now);
      stepDigits(totalDigits, now);
      if (flashUntil && now >= flashUntil) { countWrap.classList.remove('is-up', 'is-down'); flashUntil = 0; }
      if (root.classList.contains('is-demo') && demoIndex < demoSchedule.length && now >= demoSchedule[demoIndex]) {
        if (demoIndex % 2 === 0) callFront(now); else joinQueue(now);
        demoIndex += 1;
        if (demoIndex >= demoSchedule.length) { demoIndex = 0; demoSchedule = demoSchedule.map(function (v) { return v + now + 2000; }); }
      }
    }
    requestAnimationFrame(tick);
  }

  if (reduce) { paintStatus(); } else { requestAnimationFrame(tick); }
})();

// WaitingQueueHeroBoardScene — vanilla 판(09-waiting-queue-hero-board-scene) 의 React 포트.
// HERO_CALL_ROLL_MS 호출 번호 굴림(01) + HERO_LIST_SPRING_STIFFNESS 목록 자리 이동(04) +
// HERO_COUNT_ROLL_MS 전체 인원 카운터(07) 를 한 화면에서 같은 호출 하나로 동시에 계산한다.
import { useEffect, useRef, useState } from "react";
import styles from "./WaitingQueueHeroBoardScene.module.scss";

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

const HERO_CALL_ROLL_MS = 480;
const HERO_DIGIT_STAGGER_MS = 70;
const HERO_COUNT_ROLL_MS = 420;
const HERO_LIST_SPRING_STIFFNESS = 260;
const HERO_FLASH_MS = 520;
const SPRING_SETTLE_EASING = "linear(0.0, 0.051, 0.176, 0.341, 0.518, 0.685, 0.831, 0.947, 1.032, 1.087, 1.117, 1.126, 1.121, 1.105, 1.085, 1.062, 1.041, 1.022, 1.008, 0.997, 1)";

const HERO_CALL_BASE = 501;
const HERO_TOTAL_START = 18;

type Row = { id: string; ticket: string; note: string };

function heroRowsStart(): Row[] {
  return [
    { id: "h1", ticket: "501번", note: "대기 2분" },
    { id: "h2", ticket: "502번", note: "대기 6분" },
    { id: "h3", ticket: "503번", note: "대기 11분" },
    { id: "h4", ticket: "504번", note: "대기 15분" },
    { id: "h5", ticket: "505번", note: "대기 19분" }
  ];
}

function seedRand(seed: number): () => number {
  let s = seed >>> 0;
  return function () { s = (s * 1664525 + 1013904223) >>> 0; return s / 4294967296; };
}

function easeInOutCubic(t: number): number {
  return t < 0.5 ? 4 * t * t * t : 1 - Math.pow(-2 * t + 2, 3) / 2;
}

function shiftDuration(gapPx: number): number {
  return Math.round(60 + 100000 / HERO_LIST_SPRING_STIFFNESS + Math.min(240, gapPx * 0.55));
}

type Digit = { value: number; from: number; to: number; start: number; dur: number };

function digitsOf(n: number, len: number): number[] {
  const s = String(n).padStart(len, "0");
  const out: number[] = [];
  for (let i = 0; i < s.length; i += 1) out.push(s.charCodeAt(i) - 48);
  return out;
}

export default function WaitingQueueHeroBoardScene() {
  const randRef = useRef<() => number>(seedRand(434091)) as Box<() => number>;
  const [rows, setRows] = useState<Row[]>(heroRowsStart);
  const [frontIndex, setFrontIndex] = useState(0);
  const [status, setStatus] = useState("");
  const [reduce, setReduce] = useState(false);
  const [flashClass, setFlashClass] = useState("");
  const callDigitsRef = useRef<Digit[]>([{ value: 0, from: 0, to: 0, start: 0, dur: 0 }, { value: 0, from: 0, to: 0, start: 0, dur: 0 }, { value: 0, from: 0, to: 0, start: 0, dur: 0 }]) as Box<Digit[]>;
  const totalDigitsRef = useRef<Digit[]>([{ value: 0, from: 0, to: 0, start: 0, dur: 0 }, { value: 0, from: 0, to: 0, start: 0, dur: 0 }]) as Box<Digit[]>;
  const callReelRefs = useRef<Array<HTMLDivElement | null>>([null, null, null]) as Box<Array<HTMLDivElement | null>>;
  const totalReelRefs = useRef<Array<HTMLDivElement | null>>([null, null]) as Box<Array<HTMLDivElement | null>>;
  const callNumRef = useRef<number>(HERO_CALL_BASE) as Box<number>;
  const totalRef = useRef<number>(HERO_TOTAL_START) as Box<number>;
  const nextTicketRef = useRef<number>(506) as Box<number>;
  const flashUntilRef = useRef<number>(0) as Box<number>;
  const demoRef = useRef<boolean>(true) as Box<boolean>;
  const demoIndexRef = useRef<number>(0) as Box<number>;
  const demoScheduleRef = useRef<number[]>([200, 900, 1500]) as Box<number[]>;
  const frameRef = useRef<number>(0) as Box<number>;

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

  function paintReel(el: HTMLDivElement | null, value: number): void {
    if (!el) return;
    el.style.transform = "translateY(" + (-value * 10) + "%)";
  }

  function rollDigits(digits: Digit[], num: number, nowMs: number, rollMs: number): void {
    const s = digitsOf(num, digits.length);
    if (reduce) {
      const refs = digits === callDigitsRef.current ? callReelRefs.current : totalReelRefs.current;
      for (let i = 0; i < digits.length; i += 1) {
        digits[i].value = s[i]; digits[i].from = s[i]; digits[i].to = s[i]; digits[i].dur = 0;
        paintReel(refs[i], s[i]);
      }
      return;
    }
    for (let i = 0; i < digits.length; i += 1) {
      const v = s[i];
      if (v === digits[i].to) continue;
      digits[i].from = digits[i].value;
      digits[i].to = v;
      digits[i].start = nowMs + i * HERO_DIGIT_STAGGER_MS;
      digits[i].dur = rollMs;
    }
  }

  function stepDigits(digits: Digit[], refs: Array<HTMLDivElement | null>, nowMs: number): void {
    for (let i = 0; i < digits.length; i += 1) {
      const d = digits[i];
      if (d.value === d.to && nowMs >= d.start) continue;
      if (nowMs < d.start) continue;
      const t = Math.min(1, (nowMs - d.start) / d.dur);
      const e = easeInOutCubic(t);
      let span = d.to - d.from;
      if (Math.abs(span) > 5) span = span > 0 ? span - 10 : span + 10;
      let cur = d.from + span * e;
      cur = ((cur % 10) + 10) % 10;
      d.value = t >= 1 ? d.to : cur;
      paintReel(refs[i], cur);
    }
  }

  function flashTotal(dir: number, nowMs: number): void {
    setFlashClass(dir > 0 ? styles.countUp : dir < 0 ? styles.countDown : "");
    flashUntilRef.current = nowMs + HERO_FLASH_MS;
  }

  function paintStatus(): void {
    setStatus("호출 " + callNumRef.current + "번 · 대기 " + totalRef.current + "명");
  }

  function callFront(nowMs: number): void {
    const el = document.getElementById("whbRow-" + rows[frontIndex]);
    const gap = el ? el.offsetHeight + 8 : 40;
    if (frontIndex >= rows.length) return;
    if (!reduce && el) {
      const h = el.offsetHeight;
      el.style.height = h + "px";
      el.style.overflow = "hidden";
      el.style.boxSizing = "border-box";
      el.animate(
        [{ height: h + "px", opacity: 1 }, { height: "0px", opacity: 0 }],
        { duration: 220, easing: "ease-in", fill: "forwards" }
      );
      const list = document.getElementById("whbList");
      if (list) {
        const below = Array.prototype.slice.call(list.children, frontIndex + 1);
        const dur = shiftDuration(gap);
        below.forEach((b: Element) => {
          (b as HTMLElement).animate(
            [{ transform: "translateY(" + gap + "px)" }, { transform: "translateY(0px)" }],
            { duration: dur, easing: SPRING_SETTLE_EASING, fill: "both" }
          );
        });
      }
    }

    const nextRows = rows.slice();
    nextRows.splice(frontIndex, 1);
    setRows(nextRows);

    callNumRef.current = HERO_CALL_BASE + (HERO_ROWS_START_LEN - nextRows.length);
    rollDigits(callDigitsRef.current, callNumRef.current, nowMs, HERO_CALL_ROLL_MS);
    const nextTotal = Math.max(0, totalRef.current - 1);
    const dir = nextTotal - totalRef.current;
    totalRef.current = nextTotal;
    rollDigits(totalDigitsRef.current, totalRef.current, nowMs, HERO_COUNT_ROLL_MS);
    flashTotal(dir, nowMs);
    setFrontIndex(frontIndex);
    paintStatus();
  }

  const HERO_ROWS_START_LEN = 5;

  function joinQueue(nowMs: number): void {
    const ticket = nextTicketRef.current;
    nextTicketRef.current += 1;
    const id = "j" + ticket;
    setRows((prev) => prev.concat({ id, ticket: ticket + "번", note: "대기 접수" }));
    if (!reduce) {
      requestAnimationFrame(() => {
        const el = document.getElementById("whbRow-" + id);
        if (el) {
          el.animate(
            [{ opacity: 0, transform: "translateY(6px)" }, { opacity: 1, transform: "translateY(0px)" }],
            { duration: 240, easing: "ease-out" }
          );
        }
      });
    }
    const nextTotal = Math.min(99, totalRef.current + 1);
    const dir = nextTotal - totalRef.current;
    totalRef.current = nextTotal;
    rollDigits(totalDigitsRef.current, totalRef.current, nowMs, HERO_COUNT_ROLL_MS);
    flashTotal(dir, nowMs);
    void randRef;
    paintStatus();
  }

  function resetAll(nowMs: number): void {
    setRows(heroRowsStart());
    setFrontIndex(0);
    totalRef.current = HERO_TOTAL_START;
    callNumRef.current = HERO_CALL_BASE;
    nextTicketRef.current = 506;
    rollDigits(callDigitsRef.current, callNumRef.current, nowMs, HERO_CALL_ROLL_MS);
    rollDigits(totalDigitsRef.current, totalRef.current, nowMs, HERO_COUNT_ROLL_MS);
    setFlashClass("");
    paintStatus();
  }

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

  useEffect(() => {
    paintStatus();
    let t0 = 0;
    function tick(ts: number): void {
      if (t0 === 0) t0 = ts;
      const now = ts - t0;
      if (!reduce) {
        stepDigits(callDigitsRef.current, callReelRefs.current, now);
        stepDigits(totalDigitsRef.current, totalReelRefs.current, now);
        if (flashUntilRef.current && now >= flashUntilRef.current) {
          setFlashClass("");
          flashUntilRef.current = 0;
        }
        const sched = demoScheduleRef.current;
        if (demoRef.current && demoIndexRef.current < sched.length && now >= sched[demoIndexRef.current]) {
          if (demoIndexRef.current % 2 === 0) callFront(now); else joinQueue(now);
          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, rows, frontIndex]);

  function onCall(): void { stopDemo(); callFront(performance.now()); }
  function onJoin(): void { stopDemo(); joinQueue(performance.now()); }
  function onReset(): void { stopDemo(); resetAll(performance.now()); }

  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.whb}>
        <div className={styles.head}>
          <div className={styles.odometer} aria-hidden="true">
            {[0, 1, 2].map((i) => (
              <div className={styles.digit} key={i}>
                <div className={styles.reel} ref={(el: HTMLDivElement | null) => { callReelRefs.current[i] = el; }}>
                  {"0123456789".split("").map((ch) => <i key={ch}>{ch}</i>)}
                </div>
              </div>
            ))}
          </div>
          <div className={[styles.countWrap, flashClass].join(" ")} aria-hidden="true">
            <div className={[styles.odometer, styles.odometerSmall].join(" ")}>
              {[0, 1].map((i) => (
                <div className={styles.digit} key={i}>
                  <div className={styles.reel} ref={(el: HTMLDivElement | null) => { totalReelRefs.current[i] = el; }}>
                    {"0123456789".split("").map((ch) => <i key={ch}>{ch}</i>)}
                  </div>
                </div>
              ))}
            </div>
            <span className={styles.countUnit}>명 대기중</span>
          </div>
        </div>
        <ul className={styles.list} id="whbList" role="list">
          {rows.map((r, i) => (
            <li key={r.id} id={"whbRow-" + r.id} className={[styles.item, i === frontIndex ? styles.itemNext : ""].join(" ")}>
              <span className={styles.ticket}>{r.ticket}</span>
              <span className={styles.note}>{r.note}</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(" ")} disabled={rows.length === 0} onClick={onCall} onKeyDown={(e: { key: string; preventDefault: () => void }) => onKeyDown(e, onCall)}>다음 호출</button>
          <button type="button" className={styles.btn} onClick={onJoin} onKeyDown={(e: { key: string; preventDefault: () => void }) => onKeyDown(e, onJoin)}>입장</button>
          <button type="button" className={styles.btn} onClick={onReset} onKeyDown={(e: { key: string; preventDefault: () => void }) => onKeyDown(e, onReset)}>초기화</button>
        </div>
      </div>
    </main>
  );
}