09Failure shake — an effect where the indicator briefly shakes side to side once the refresh reaches a failed state

<main class="stage">
<div class="prof is-demo" id="prof">
  <div class="prof__phone" id="profPhone">
    <div class="prof__zone">
      <span class="prof__disc" id="profDisc"></span>
    </div>
    <div class="prof__list">
      <div class="prof__row"></div>
      <div class="prof__row"></div>
    </div>
  </div>
  <span class="prof__hint" id="profHint">Pull down</span>
</div>
</main>

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

// 계산 겹(시도 홀짝 판정·감쇠 진동 흔들림)은 JS 에 있다 — 여기는 정적 배치만.
@include stage($stage-paper);

.prof {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: $sp-3;
}

.prof__phone {
  position: relative;
  width: 220px;
  height: 168px;
  overflow: hidden;
  border-radius: $r-card;
  background: $subject-cream;
  touch-action: none;
  cursor: grab;
}

.prof__zone {
  position: relative;
  height: 56px;
  display: grid;
  place-items: center;
}

.prof__disc {
  width: 28px;
  height: 28px;
  border-radius: $r-pill;
  background: rgba($subject-ink, .22);
  transition: background $dur-quick $ease-out;

  &--ready { background: $subject-blue-deep; }
  &--fail { background: $error; }
  &--ok { background: $subject-mint; }
}

.prof__list {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: $sp-2;
  padding: $sp-3 $sp-4;
}

.prof__row {
  height: 20px;
  border-radius: $r-sm;
  background: $stage-paper;
}

.prof__hint {
  color: $subject-ink;
  font-size: 12px;
  text-align: center;
}

@media (max-width: 340px) {
  .prof__phone { width: 176px; height: 132px; }
  .prof__zone { height: 44px; }
  .prof__disc { width: 22px; height: 22px; }
  .prof__list { padding: $sp-2 $sp-3; gap: $sp-1; }
  .prof__row { height: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  .prof__disc, .prof__phone { transition: none !important; }
}

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

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

.prof {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.prof__phone {
  position: relative;
  width: 220px;
  height: 168px;
  overflow: hidden;
  border-radius: 16px;
  background: #fff7e6;
  touch-action: none;
  cursor: grab;
}

.prof__zone {
  position: relative;
  height: 56px;
  display: grid;
  place-items: center;
}

.prof__disc {
  width: 28px;
  height: 28px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.22);
  transition: background 220ms ease-out;
}
.prof__disc--ready {
  background: #0a4fe8;
}
.prof__disc--fail {
  background: #c2361a;
}
.prof__disc--ok {
  background: #4cd4a6;
}

.prof__list {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px 16px;
}

.prof__row {
  height: 20px;
  border-radius: 8px;
  background: #ffffff;
}

.prof__hint {
  color: #17141a;
  font-size: 12px;
  text-align: center;
}

@media (max-width: 340px) {
  .prof__phone {
    width: 176px;
    height: 132px;
  }
  .prof__zone {
    height: 44px;
  }
  .prof__disc {
    width: 22px;
    height: 22px;
  }
  .prof__list {
    padding: 8px 12px;
    gap: 4px;
  }
  .prof__row {
    height: 16px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .prof__disc, .prof__phone {
    transition: none !important;
  }
}

(function () {
  var phone = document.getElementById('profPhone');
  var disc = document.getElementById('profDisc');
  var hint = document.getElementById('profHint');
  var root = document.getElementById('prof');

  // 계산 겹: 성공/실패는 Math.random 이 아니라 시도 횟수(attemptCount)의 홀짝으로 정해지는
  // 결정적 번갈이(1회차 실패·2회차 성공…)다. 실패 시 흔들림은 감쇠 진동 AMP*e^(-t/TAU)*sin(t*FREQ) 를
  // phone 의 translateX 에 얹는 시간 기반 계산이지, 매번 새 애니메이션 클래스를 재생시키는 게 아니다.
  var REF = 90, MAX = 130;
  var AMP = 10, TAU = 0.12, FREQ = 46;

  var raw = 0, target = 0, raf1 = null;
  function apply(rawV) {
    var pull = Math.min(rawV, MAX) * 0.28;
    disc.style.transform = 'translateY(' + pull.toFixed(1) + 'px) scale(' + (0.7 + 0.3 * Math.min(1, rawV / REF)).toFixed(2) + ')';
    disc.classList.toggle('prof__disc--ready', rawV >= REF);
  }
  function settle() {
    raw += (target - raw) * 0.3;
    if (Math.abs(target - raw) < 0.3) { raw = target; }
    apply(raw);
    if (raw !== target) { raf1 = requestAnimationFrame(settle); } else { raf1 = null; }
  }
  function goTo(v) { target = v; if (raf1 === null) { raf1 = requestAnimationFrame(settle); } }

  var shaking = false, shakeStart = 0;
  function frame(now) {
    if (shaking) {
      var t = (now - shakeStart) / 1000;
      var off = AMP * Math.exp(-t / TAU) * Math.sin(t * FREQ);
      phone.style.transform = 'translateX(' + off.toFixed(1) + 'px)';
      if (t > 0.5) { shaking = false; phone.style.transform = 'translateX(0px)'; }
    }
    requestAnimationFrame(frame);
  }
  requestAnimationFrame(frame);

  var attemptCount = 0, committing = false, commitTimer = null;
  function attempt() {
    attemptCount += 1;
    var fail = attemptCount % 2 === 1;
    committing = true;
    if (fail) {
      hint.textContent = 'Offline - retry';
      disc.classList.add('prof__disc--fail');
      shaking = true; shakeStart = performance.now();
      commitTimer = setTimeout(function () {
        disc.classList.remove('prof__disc--fail', 'prof__disc--ready');
        committing = false;
        raw = 0; apply(0);
        hint.textContent = 'Pull down';
      }, 640);
    } else {
      hint.textContent = 'Refresh complete';
      disc.classList.add('prof__disc--ok');
      commitTimer = setTimeout(function () {
        disc.classList.remove('prof__disc--ok', 'prof__disc--ready');
        committing = false;
        raw = 0; apply(0);
        hint.textContent = 'Pull down';
      }, 640);
    }
  }

  var dragging = false, startY = 0, startRaw = 0;
  function onDown(y) { if (committing) { return; } dragging = true; startY = y; startRaw = raw; if (raf1) { cancelAnimationFrame(raf1); raf1 = null; } }
  function onMove(y) {
    if (!dragging) { return; }
    raw = Math.max(0, Math.min(MAX, startRaw + (y - startY)));
    apply(raw);
  }
  function onUp() {
    if (!dragging) { return; }
    dragging = false;
    if (raw >= REF) { attempt(); } else { goTo(0); }
  }

  function wireReal() {
    phone.addEventListener('pointerdown', function (e) { root.classList.remove('is-demo'); stopAutoplay(); onDown(e.clientY); });
    window.addEventListener('pointermove', function (e) { onMove(e.clientY); });
    window.addEventListener('pointerup', onUp);
  }
  phone.style.touchAction = 'none';
  wireReal();
  apply(0);

  var autoRaw = 0, autoTimer = null;
  function autoTick() {
    if (committing) { return; }
    autoRaw += 18;
    if (autoRaw >= REF) { raw = REF; apply(raw); autoRaw = 0; attempt(); return; }
    raw = autoRaw; apply(raw);
  }
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  function stopAutoplay() { if (autoTimer) { clearInterval(autoTimer); autoTimer = null; } if (commitTimer) { clearTimeout(commitTimer); } }
  if (!reduce) { autoTimer = setInterval(autoTick, 190); }
})();

import { useEffect, useRef } from "react";
import styles from "./PullRefreshOfflineRetryShake.module.scss";

export type PullRefreshOfflineRetryShakeProps = {
  color?: string;
};

export default function PullRefreshOfflineRetryShake({
  color = "#0a4fe8",
}: PullRefreshOfflineRetryShakeProps) {
  const rootRef = useRef<HTMLDivElement | null>(null);

  useEffect(() => {
    const root = rootRef.current;
    if (!root) return;
    const phone = root.querySelector<HTMLDivElement>(`.${styles.phone}`);
    const disc = root.querySelector<HTMLSpanElement>(`.${styles.disc}`);
    const hint = root.querySelector<HTMLSpanElement>(`.${styles.hint}`);
    if (!phone || !disc || !hint) return;

    // 계산 겹: 성공/실패는 Math.random 이 아니라 시도 횟수(attemptCount)의 홀짝으로 정해지는
    // 결정적 번갈이(1회차 실패·2회차 성공…)다. 실패 시 흔들림은 감쇠 진동 AMP*e^(-t/TAU)*sin(t*FREQ) 를
    // phone 의 translateX 에 얹는 시간 기반 계산이지, 매번 새 애니메이션 클래스를 재생시키는 게 아니다.
    const REF = 90, MAX = 130;
    const AMP = 10, TAU = 0.12, FREQ = 46;
    const readyClass = styles["disc--ready"];
    const failClass = styles["disc--fail"];
    const okClass = styles["disc--ok"];

    let raw = 0, target = 0, raf1: number | null = null;
    function apply(rawV: number) {
      const pull = Math.min(rawV, MAX) * 0.28;
      disc!.style.transform = "translateY(" + pull.toFixed(1) + "px) scale(" + (0.7 + 0.3 * Math.min(1, rawV / REF)).toFixed(2) + ")";
      disc!.classList.toggle(readyClass, rawV >= REF);
    }
    function settle() {
      raw += (target - raw) * 0.3;
      if (Math.abs(target - raw) < 0.3) raw = target;
      apply(raw);
      raf1 = raw !== target ? requestAnimationFrame(settle) : null;
    }
    function goTo(v: number) { target = v; if (raf1 === null) { raf1 = requestAnimationFrame(settle); } }

    let shaking = false, shakeStart = 0, rafFrame: number;
    function frame(now: number) {
      if (shaking) {
        const t = (now - shakeStart) / 1000;
        const off = AMP * Math.exp(-t / TAU) * Math.sin(t * FREQ);
        phone!.style.transform = "translateX(" + off.toFixed(1) + "px)";
        if (t > 0.5) { shaking = false; phone!.style.transform = "translateX(0px)"; }
      }
      rafFrame = requestAnimationFrame(frame);
    }
    rafFrame = requestAnimationFrame(frame);

    let attemptCount = 0, committing = false;
    let timers: number[] = [];
    function clearTimers() { timers.forEach((t) => window.clearTimeout(t)); timers = []; }
    function attempt() {
      attemptCount += 1;
      const fail = attemptCount % 2 === 1;
      committing = true;
      if (fail) {
        hint!.textContent = "오프라인 - 다시 시도";
        disc!.classList.add(failClass);
        shaking = true; shakeStart = performance.now();
        timers.push(window.setTimeout(() => {
          disc!.classList.remove(failClass, readyClass);
          committing = false;
          raw = 0; apply(0);
          hint!.textContent = "아래로 당기세요";
        }, 640));
      } else {
        hint!.textContent = "새로고침 완료";
        disc!.classList.add(okClass);
        timers.push(window.setTimeout(() => {
          disc!.classList.remove(okClass, readyClass);
          committing = false;
          raw = 0; apply(0);
          hint!.textContent = "아래로 당기세요";
        }, 640));
      }
    }

    let dragging = false, startY = 0, startRaw = 0;
    function onDown(y: number) {
      if (committing) return;
      dragging = true; startY = y; startRaw = raw;
      if (raf1 !== null) { cancelAnimationFrame(raf1); raf1 = null; }
    }
    function onMove(y: number) {
      if (!dragging) return;
      raw = Math.max(0, Math.min(MAX, startRaw + (y - startY)));
      apply(raw);
    }
    function onUp() {
      if (!dragging) return;
      dragging = false;
      if (raw >= REF) { attempt(); } else { goTo(0); }
    }

    function onPointerDown(e: PointerEvent) { stopAutoplay(); onDown(e.clientY); }
    function onPointerMove(e: PointerEvent) { onMove(e.clientY); }
    phone.style.touchAction = "none";
    phone.addEventListener("pointerdown", onPointerDown);
    window.addEventListener("pointermove", onPointerMove);
    window.addEventListener("pointerup", onUp);
    apply(0);

    let autoRaw = 0, autoTimer: number | null = null;
    function autoTick() {
      if (committing) return;
      autoRaw += 18;
      if (autoRaw >= REF) { raw = REF; apply(raw); autoRaw = 0; attempt(); return; }
      raw = autoRaw; apply(raw);
    }
    function stopAutoplay() {
      if (autoTimer !== null) { window.clearInterval(autoTimer); autoTimer = null; }
      clearTimers();
    }
    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    if (!reduce) { autoTimer = window.setInterval(autoTick, 190); }

    return () => {
      stopAutoplay();
      if (raf1 !== null) cancelAnimationFrame(raf1);
      cancelAnimationFrame(rafFrame);
      phone.removeEventListener("pointerdown", onPointerDown);
      window.removeEventListener("pointermove", onPointerMove);
      window.removeEventListener("pointerup", onUp);
    };
  }, []);

  return (
    <div ref={rootRef} className={styles.stage}>
      <div className={styles.prof}>
        <div className={styles.phone}>
          <div className={styles.zone}>
            <span className={styles.disc} style={{ "--accent": color } as any} />
          </div>
          <div className={styles.list}>
            <div className={styles.row} />
            <div className={styles.row} />
          </div>
        </div>
        <span className={styles.hint}>아래로 당기세요</span>
      </div>
    </div>
  );
}