08Pattern-match value toggle — when the leading digit value matches a set pattern value, a shape value beside it smoothly changes

<main class="stage">
<div class="cn is-demo" id="cn">
  <label class="cn__field">
    <input class="cn__input" id="cnInput" type="text" inputmode="numeric" autocomplete="off" spellcheck="false" maxlength="16" value="">
  </label>
  <div class="cn__shapeBox">
    <svg viewBox="0 0 40 40" width="34" height="34" aria-hidden="true">
      <polygon class="cn__poly" id="cnPoly" points="20,10 28,15 28,25 20,30 12,25 12,15"/>
    </svg>
    <span class="cn__tag" id="cnTag">Pattern not recognized</span>
  </div>
</div>
</main>

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

// 계산 겹: 앞자리 패턴 값 → 가상 도형 A/B/C 점 배열을 rAF 로 보간한다(index.html, 6점 폴리곤).
@include stage($stage-paper);

.cn {
  width: 100%;
  max-width: 300px;
  display: flex;
  align-items: center;
  gap: $sp-4;
}

.cn__field { flex: 1; display: block; }

.cn__input {
  width: 100%;
  box-sizing: border-box;
  padding: $sp-3 $sp-4;
  border-radius: $r-control;
  border: 0;
  background: $subject-ink;
  color: $subject-cream;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: .04em;

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

.cn__shapeBox {
  display: grid;
  justify-items: center;
  gap: $sp-1;
  width: 68px;
}

.cn__poly { fill: $subject-blue-deep; }

.cn__tag {
  font-weight: 700;
  font-size: 10px;
  color: rgba($subject-ink, .72);
  white-space: nowrap;
}

@media (max-width: 340px) {
  .cn { gap: $sp-2; }
  .cn__input { padding: $sp-2 $sp-3; font-size: 13px; }
  .cn__shapeBox { width: 56px; }
}

@media (prefers-reduced-motion: reduce) {
  // 도형 보간은 JS rAF 로 계산되므로 reduce 시 매 프레임 목표값으로 즉시 스냅한다(index.html MORPH_MS 분기 없음 — 코멘트 유지용)
  .cn__poly { transition: none; }
}

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);
}

.cn {
  width: 100%;
  max-width: 300px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.cn__field {
  flex: 1;
  display: block;
}

.cn__input {
  width: 100%;
  box-sizing: border-box;
  padding: 12px 16px;
  border-radius: 12px;
  border: 0;
  background: #17141a;
  color: #fff7e6;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.04em;
}
.cn__input:focus {
  outline: 2px solid #17141a;
  outline-offset: 2px;
}

.cn__shapeBox {
  display: grid;
  justify-items: center;
  gap: 4px;
  width: 68px;
}

.cn__poly {
  fill: #0a4fe8;
}

.cn__tag {
  font-weight: 700;
  font-size: 10px;
  color: rgba(23, 20, 26, 0.72);
  white-space: nowrap;
}

@media (max-width: 340px) {
  .cn {
    gap: 8px;
  }
  .cn__input {
    padding: 8px 12px;
    font-size: 13px;
  }
  .cn__shapeBox {
    width: 56px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .cn__poly {
    transition: none;
  }
}

(function () {
  var root = document.getElementById('cn');
  var input = document.getElementById('cnInput');
  var poly = document.getElementById('cnPoly');
  var tag = document.getElementById('cnTag');
  var MORPH_MS = 420; // 계산 겹: 앞자리 Pattern 값이 바뀔 때 도형 점을 이만큼 동안 보간한다

  // 가상 도형 3종(A/B/C) — 실제 카드사 로고·BIN 범위와 무관한 중립 라벨.
  var SHAPES = {
    A: [[20, 4], [33.9, 12], [33.9, 28], [20, 36], [6.1, 28], [6.1, 12]],
    B: [[29, 4.4], [33, 20], [29, 35.6], [13.5, 31.3], [2, 20], [13.5, 8.7]],
    C: [[20, 1], [26.9, 16], [36.5, 29.5], [20, 28], [3.5, 29.5], [13.1, 16]],
    N: [[20, 10], [28, 15], [28, 25], [20, 30], [12, 25], [12, 15]]
  };
  var PREFIX_MAP = { '3': 'C', '4': 'A', '5': 'B' };

  var current = SHAPES.N.map(function (p) { return p.slice(); });
  var raf = null;

  function easeOut(t) { return 1 - Math.pow(1 - t, 3); }

  function morphTo(key) {
    var target = SHAPES[key];
    var start = current.map(function (p) { return p.slice(); });
    var t0 = performance.now();
    if (raf) cancelAnimationFrame(raf);
    function step(now) {
      var t = Math.min((now - t0) / MORPH_MS, 1);
      var e = easeOut(t);
      var pts = start.map(function (p, i) {
        var x = p[0] + (target[i][0] - p[0]) * e;
        var y = p[1] + (target[i][1] - p[1]) * e;
        return x.toFixed(1) + ',' + y.toFixed(1);
      });
      poly.setAttribute('points', pts.join(' '));
      if (t < 1) { raf = requestAnimationFrame(step); }
      else { current = target.map(function (p) { return p.slice(); }); }
    }
    raf = requestAnimationFrame(step);
  }

  var lastKey = 'N';
  function paint(value) {
    var lead = value.charAt(0);
    var key = PREFIX_MAP[lead] || 'N';
    if (key !== lastKey) {
      morphTo(key);
      lastKey = key;
    }
    tag.textContent = key === 'N' ? 'Pattern not recognized' : ('Pattern ' + key);
  }

  input.addEventListener('input', function () {
    root.classList.remove('is-demo');
    stopAutoplay();
    input.value = input.value.replace(/\D/g, '').slice(0, 16);
    paint(input.value);
  });

  // 자동 루프: 앞자리 값을 바꿔가며 세 패턴을 순서대로 보여준다.
  var SEQ = ['', '9999999999999995', '5399148803436467', '3739148803436', '', '9999999999999995'];
  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; } if (raf) { cancelAnimationFrame(raf); raf = null; } }
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  if (!reduce) { autoTimer = setInterval(autoTick, 1100); autoTick(); }
  else { input.value = SEQ[1]; paint(SEQ[1]); }
})();

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

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

const MORPH_MS = 420; // 계산 겹: 앞자리 패턴 값이 바뀔 때 도형 점을 이만큼 동안 보간한다

// 가상 도형 3종(A/B/C) — 실제 카드사 로고·BIN 범위와 무관한 중립 라벨.
const SHAPES: Record<string, number[][]> = {
  A: [[20, 4], [33.9, 12], [33.9, 28], [20, 36], [6.1, 28], [6.1, 12]],
  B: [[29, 4.4], [33, 20], [29, 35.6], [13.5, 31.3], [2, 20], [13.5, 8.7]],
  C: [[20, 1], [26.9, 16], [36.5, 29.5], [20, 28], [3.5, 29.5], [13.1, 16]],
  N: [[20, 10], [28, 15], [28, 25], [20, 30], [12, 25], [12, 15]],
};
const PREFIX_MAP: Record<string, string> = { "3": "C", "4": "A", "5": "B" };

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

  useEffect(() => {
    const root = rootRef.current;
    if (!root) return;
    const input = root.querySelector(`.${styles.input}`) as HTMLInputElement | null;
    const poly = root.querySelector(`.${styles.poly}`) as SVGPolygonElement | null;
    const tag = root.querySelector(`.${styles.tag}`) as HTMLElement | null;
    if (!input || !poly || !tag) return;

    let current = SHAPES.N.map((p) => p.slice());
    let raf: number | null = null;

    function easeOut(t: number) { return 1 - Math.pow(1 - t, 3); }

    function morphTo(key: string) {
      const target = SHAPES[key];
      const start = current.map((p) => p.slice());
      const t0 = performance.now();
      if (raf !== null) cancelAnimationFrame(raf);
      function step(now: number) {
        const t = Math.min((now - t0) / MORPH_MS, 1);
        const e = easeOut(t);
        const pts = start.map((p, i) => {
          const x = p[0] + (target[i][0] - p[0]) * e;
          const y = p[1] + (target[i][1] - p[1]) * e;
          return x.toFixed(1) + "," + y.toFixed(1);
        });
        poly!.setAttribute("points", pts.join(" "));
        if (t < 1) { raf = requestAnimationFrame(step); }
        else { current = target.map((p) => p.slice()); }
      }
      raf = requestAnimationFrame(step);
    }

    let lastKey = "N";
    function paint(value: string) {
      const lead = value.charAt(0);
      const key = PREFIX_MAP[lead] || "N";
      if (key !== lastKey) {
        morphTo(key);
        lastKey = key;
      }
      tag!.textContent = key === "N" ? "패턴 미인식" : "패턴 " + key;
    }

    function onInput() {
      root!.classList.remove(styles["is-demo"]);
      stopAutoplay();
      input!.value = input!.value.replace(/\D/g, "").slice(0, 16);
      paint(input!.value);
    }
    input.addEventListener("input", onInput);

    // 자동 루프: 앞자리 값을 바꿔가며 세 패턴을 순서대로 보여준다.
    const SEQ = ["", "9999999999999995", "5399148803436467", "3739148803436", "", "9999999999999995"];
    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; }
      if (raf !== null) { cancelAnimationFrame(raf); raf = null; }
    }
    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    if (!reduce) { autoTimer = window.setInterval(autoTick, 1100); autoTick(); }
    else { input.value = SEQ[1]; paint(SEQ[1]); }

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

  return (
    <div ref={rootRef} className={`${styles.stage} ${styles.cn} ${styles["is-demo"]}`}>
      <label className={styles.field}>
        <input className={styles.input} type="text" inputMode="numeric" autoComplete="off" spellCheck={false} maxLength={16} defaultValue="" />
      </label>
      <div className={styles.shapeBox}>
        <svg viewBox="0 0 40 40" width="34" height="34" aria-hidden="true">
          <polygon className={styles.poly} points="20,10 28,15 28,25 20,30 12,25 12,15" />
        </svg>
        <span className={styles.tag}>패턴 미인식</span>
      </div>
    </div>
  );
}