06Estimated-time unit switch — the unit of a displayed time-estimate value switches each time a computed bit value passes a boundary value

<main class="stage">
<div class="ct is-demo" id="ct">
  <label class="ct__field">
    <input class="ct__input" id="ctInput" type="text" autocomplete="off" spellcheck="false" value="">
  </label>
  <div class="ct__readout">
    <span class="ct__time" id="ctTime">Instant</span>
  </div>
  <div class="ct__track"><div class="ct__fill" id="ctFill"></div></div>
  <div class="ct__meta">Possible combinations <b id="ctGuesses">0</b></div>
</div>
</main>

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

// 계산 겹: 경우의 수(문자 집합 크기^글자 수) ÷ 가정 초당 시도 수(GUESSES_PER_SEC,
// 데모 안 임의 상수)로 초 값을 만들고, log10 스케일로 막대를 채운다.
@include stage($stage-yellow);

.ct {
  width: 100%;
  max-width: 320px;
  display: grid;
  gap: $sp-3;
}

.ct__field { display: block; }

.ct__input {
  width: 100%;
  box-sizing: border-box;
  padding: $sp-3 $sp-4;
  border-radius: $r-control;
  border: 0;
  background: rgba($stage-ink, .08);
  color: $stage-ink;
  font: 500 16px/1.3 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  letter-spacing: .04em;
  -webkit-text-security: disc;

  &:focus { outline: 2px solid $stage-ink; outline-offset: 2px; }
}

.ct__readout {
  display: flex;
  justify-content: center;
}

.ct__time {
  font: 800 26px/1.1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: $stage-ink;
  font-variant-numeric: tabular-nums;
}

.ct__track {
  position: relative;
  height: $sp-3;
  border-radius: $r-sm;
  background: rgba($stage-ink, .1);
  overflow: hidden;
}

.ct__fill {
  position: absolute;
  inset: 0;
  border-radius: $r-sm;
  background: $stage-ink;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform $dur-base $ease-out;
}

.ct__meta {
  font: 600 13px/1.2 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: rgba($stage-ink, .72);
  text-align: center;

  b { color: $stage-ink; font-variant-numeric: tabular-nums; }
}

@media (max-width: 340px) {
  .ct { max-width: 260px; }
  .ct__input { padding: $sp-2 $sp-3; font-size: 14px; }
  .ct__time { font-size: 21px; }
  .ct__meta { font-size: 11px; }
}

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

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);
}

.ct {
  width: 100%;
  max-width: 320px;
  display: grid;
  gap: 12px;
}

.ct__field {
  display: block;
}

.ct__input {
  width: 100%;
  box-sizing: border-box;
  padding: 12px 16px;
  border-radius: 12px;
  border: 0;
  background: rgba(23, 20, 26, 0.08);
  color: #17141a;
  font: 500 16px/1.3 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  letter-spacing: 0.04em;
  -webkit-text-security: disc;
}
.ct__input:focus {
  outline: 2px solid #17141a;
  outline-offset: 2px;
}

.ct__readout {
  display: flex;
  justify-content: center;
}

.ct__time {
  font: 800 26px/1.1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: #17141a;
  font-variant-numeric: tabular-nums;
}

.ct__track {
  position: relative;
  height: 12px;
  border-radius: 8px;
  background: rgba(23, 20, 26, 0.1);
  overflow: hidden;
}

.ct__fill {
  position: absolute;
  inset: 0;
  border-radius: 8px;
  background: #17141a;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 300ms ease-out;
}

.ct__meta {
  font: 600 13px/1.2 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: rgba(23, 20, 26, 0.72);
  text-align: center;
}
.ct__meta b {
  color: #17141a;
  font-variant-numeric: tabular-nums;
}

@media (max-width: 340px) {
  .ct {
    max-width: 260px;
  }
  .ct__input {
    padding: 8px 12px;
    font-size: 14px;
  }
  .ct__time {
    font-size: 21px;
  }
  .ct__meta {
    font-size: 11px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .ct__fill {
    transition: none;
  }
}

(function () {
  var root = document.getElementById('ct');
  var input = document.getElementById('ctInput');
  var timeEl = document.getElementById('ctTime');
  var fill = document.getElementById('ctFill');
  var guessesEl = document.getElementById('ctGuesses');

  // 가정값: 데모 안 임의 상수 — 실제 하드웨어·연도·연구 인용이 아니다.
  var GUESSES_PER_SEC = 1e6;
  var LOG_MAX = 12; // 막대 눈금 상한(sec 단위 log10) — 이 Value 이상은 꽉 찬 막대

  function charsetSize(value) {
    var size = 0;
    if (/[a-z]/.test(value)) size += 26;
    if (/[A-Z]/.test(value)) size += 26;
    if (/[0-9]/.test(value)) size += 10;
    if (/[^A-Za-z0-9]/.test(value)) size += 32;
    return size;
  }

  // 계산 겹: Char set 크기의 Length 제곱으로 경우의 수를 구하고, 가정 초당
  // 시도 수로 나눠 sec 값을 만든 뒤, 자리 단위(sec→min→hr→day→yr→century)로 변환한다.
  function guessesOf(value) {
    var size = charsetSize(value);
    if (!value.length || size === 0) return 0;
    return Math.pow(size, value.length);
  }

  var UNITS = [
    { at: 1, name: 'sec' },
    { at: 60, name: 'min', div: 60 },
    { at: 3600, name: 'hr', div: 3600 },
    { at: 86400, name: 'day', div: 86400 },
    { at: 31536000, name: 'yr', div: 31536000 },
    { at: 31536000 * 100, name: 'century', div: 31536000 * 100 }
  ];

  function formatTime(seconds) {
    if (seconds < 1) return 'Instant';
    var pick = UNITS[0];
    for (var i = 0; i < UNITS.length; i++) if (seconds >= UNITS[i].at) pick = UNITS[i];
    var div = pick.div || 1;
    var n = seconds / div;
    var text = n >= 100 ? Math.round(n).toLocaleString() : (Math.round(n * 10) / 10).toString();
    return 'about ' + text + pick.name;
  }

  function paint(value) {
    var guesses = guessesOf(value);
    var seconds = guesses / GUESSES_PER_SEC;
    timeEl.textContent = formatTime(seconds);
    var mag = seconds < 1 ? 0 : Math.log(seconds + 1) / Math.LN10;
    fill.style.transform = 'scaleX(' + Math.max(0, Math.min(1, mag / LOG_MAX)) + ')';
    guessesEl.textContent = guesses >= 1e6 ? guesses.toExponential(1) : Math.round(guesses).toLocaleString();
  }

  input.addEventListener('input', function () {
    root.classList.remove('is-demo');
    stopAutoplay();
    paint(input.value);
  });

  paint(input.value);

  // 자동 루프: 시드 고정 문자열 배열로 길이·문자 종류를 함께 늘렸다 줄인다.
  var SEQ = ['', 'ab', 'abcd12', 'abcd12EF', 'abcd12EF!@', 'abcd12EF!@#$xy',
             'abcd12EF!@', 'abcd12EF', 'abcd12', 'ab', ''];
  var si = 0;
  var autoTimer = null;
  function autoTick() { input.value = SEQ[si]; paint(SEQ[si]); si = (si + 1) % SEQ.length; }
  function stopAutoplay() { if (autoTimer) { clearInterval(autoTimer); autoTimer = null; } }
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  if (!reduce) { autoTimer = setInterval(autoTick, 380); autoTick(); }
})();

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

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

// 가정값: 데모 안 임의 상수 — 실제 하드웨어·연도·연구 인용이 아니다.
const GUESSES_PER_SEC = 1e6;
const LOG_MAX = 12;

type Unit = { at: number; name: string; div?: number };
const UNITS: Unit[] = [
  { at: 1, name: "초" },
  { at: 60, name: "분", div: 60 },
  { at: 3600, name: "시간", div: 3600 },
  { at: 86400, name: "일", div: 86400 },
  { at: 31536000, name: "년", div: 31536000 },
  { at: 31536000 * 100, name: "세기", div: 31536000 * 100 },
];

export default function CrackTimeEstimate() {
  const rootRef = useRef(null) as unknown as Box<HTMLDivElement | null>;

  useEffect(() => {
    const root = rootRef.current;
    if (!root) return;
    const input = root.querySelector(`.${styles.input}`) as HTMLInputElement | null;
    const timeEl = root.querySelector(`.${styles.time}`) as HTMLElement | null;
    const fill = root.querySelector(`.${styles.fill}`) as HTMLElement | null;
    const guessesEl = root.querySelector(`.${styles.guesses}`) as HTMLElement | null;
    if (!input || !timeEl || !fill || !guessesEl) return;

    function charsetSize(value: string) {
      let size = 0;
      if (/[a-z]/.test(value)) size += 26;
      if (/[A-Z]/.test(value)) size += 26;
      if (/[0-9]/.test(value)) size += 10;
      if (/[^A-Za-z0-9]/.test(value)) size += 32;
      return size;
    }

    // 계산 겹: 문자 집합 크기의 글자 수 제곱으로 경우의 수를 구하고, 가정 초당
    // 시도 수로 나눠 초 값을 만든 뒤, 자리 단위(초→분→시간→일→년→세기)로 변환한다.
    function guessesOf(value: string) {
      const size = charsetSize(value);
      if (!value.length || size === 0) return 0;
      return Math.pow(size, value.length);
    }

    function formatTime(seconds: number) {
      if (seconds < 1) return "즉시";
      let pick = UNITS[0];
      for (let i = 0; i < UNITS.length; i++) if (seconds >= UNITS[i].at) pick = UNITS[i];
      const div = pick.div || 1;
      const n = seconds / div;
      const text = n >= 100 ? Math.round(n).toLocaleString() : (Math.round(n * 10) / 10).toString();
      return "약 " + text + pick.name;
    }

    function paint(value: string) {
      const guesses = guessesOf(value);
      const seconds = guesses / GUESSES_PER_SEC;
      timeEl!.textContent = formatTime(seconds);
      const mag = seconds < 1 ? 0 : Math.log(seconds + 1) / Math.LN10;
      fill!.style.transform = "scaleX(" + Math.max(0, Math.min(1, mag / LOG_MAX)) + ")";
      guessesEl!.textContent = guesses >= 1e6 ? guesses.toExponential(1) : Math.round(guesses).toLocaleString();
    }

    function onInput() {
      root!.classList.remove(styles["is-demo"]);
      stopAutoplay();
      paint(input!.value);
    }
    input.addEventListener("input", onInput);
    paint(input.value);

    // 자동 루프: 시드 고정 문자열 배열로 길이·문자 종류를 함께 늘렸다 줄인다.
    const SEQ = ["", "ab", "abcd12", "abcd12EF", "abcd12EF!@", "abcd12EF!@#$xy",
      "abcd12EF!@", "abcd12EF", "abcd12", "ab", ""];
    let si = 0;
    let autoTimer: number | null = null;
    function autoTick() { input!.value = SEQ[si]; paint(SEQ[si]); si = (si + 1) % SEQ.length; }
    function stopAutoplay() { if (autoTimer !== null) { window.clearInterval(autoTimer); autoTimer = null; } }
    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    if (!reduce) { autoTimer = window.setInterval(autoTick, 380); autoTick(); }

    return () => {
      stopAutoplay();
      input.removeEventListener("input", onInput);
    };
  }, []);

  return (
    <div ref={rootRef} className={`${styles.stage} ${styles.ct} ${styles["is-demo"]}`}>
      <label className={styles.field}>
        <input className={styles.input} type="text" autoComplete="off" spellCheck={false} defaultValue="" />
      </label>
      <div className={styles.readout}>
        <span className={styles.time}>즉시</span>
      </div>
      <div className={styles.track}><div className={styles.fill} /></div>
      <div className={styles.meta}>경우의 수 <b className={styles.guesses}>0</b></div>
    </div>
  );
}