09ヒーローシーン — 紙吹雪が弾け結果を保存できる完成版

<main class="stage">
<div class="hr" id="hr">
  <p class="hr__hint">停止判定の直後に紙吹雪が弾け結果が上がります — 保存ボタンは盤をtoDataURLで書き出します</p>
  <div class="hr__row">
    <div class="hr__field" id="field" role="application" aria-label="ルーレットヒーロー" tabindex="0">
      <canvas class="hr__cv" id="cv"></canvas>
    </div>
    <div class="hr__side">
      <b class="hr__win" id="win">READY</b>
      <span class="hr__unit">止まると結果が大きく上がります</span>
      <a class="hr__save" id="save" href="#" download="roulette.png">盤を保存</a>
      <p class="hr__meta">摩擦・ティック・重み・脱落を1画面に</p>
      <p class="hr__sr" id="live" aria-live="polite"></p>
    </div>
  </div>
</div>
</main>

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

// 히어로 씬(09) — 움직임은 전부 캔버스 rAF 루프다. CSS @keyframes 를 두지 않는다.
// 잉크 무대. 칸 여덟 색은 파스텔 팔레트 — 폭죽 파티클도 같은 팔레트를 써 판과 한몸이다.
// 결과 리본·후프는 크림 면 + 잉크 선 — 어두운 무대 위 대비 17:1.

$duration: $dur-loop;
$easing: $ease-spring;
$color: $subject-sky;

@include stage($stage-ink);

.hr {
  --w1: #a6b4d3;   // 파랑빛 파스텔 — 1번 칸
  --w2: #d9c48f;   // 골드 파스텔 — 2번 칸
  --w3: #a6d3b1;   // 연두 파스텔 — 3번 칸
  --w4: #d8a3b4;   // 로즈 파스텔 — 4번 칸
  --w5: #9fc6c2;   // 틸 파스텔 — 5번 칸
  --w6: #c2a8d1;   // 플럼 파스텔 — 6번 칸
  --w7: #e0c6a2;   // 모래 파스텔 — 7번 칸
  --w8: #a9c4b0;   // 세이지 파스텔 — 8번 칸
  --ink: #{$subject-ink};
  --cream: #{$subject-cream};

  display: flex; flex-direction: column; gap: $sp-1;
  width: 100%; max-width: 436px;
}

.hr__hint {
  margin: 0; font-weight: 700; font-size: clamp(10px, 2.8vw, 12px); line-height: 1.35;
  color: $subject-cream;
}

.hr__row { display: flex; gap: $sp-2; align-items: stretch; }

.hr__field {
  position: relative; overflow: hidden;
  flex: 0 0 auto;
  width: clamp(176px, 46vw, 228px);
  height: clamp(176px, 46vw, 228px);
  border-radius: $r-card;
  background: rgba($subject-cream, .04);
  box-shadow: inset 0 0 0 1px rgba($subject-cream, .14);
  cursor: grab; touch-action: none;
}
.hr__field:active { cursor: grabbing; }
.hr__field:focus-visible { outline: 2px solid $color; outline-offset: 2px; }

.hr__cv { display: block; width: 100%; height: 100%; }

.hr__side {
  flex: 1; min-width: 0;
  display: flex; flex-direction: column; gap: $sp-1;
  padding-top: $sp-1;
}
.hr__win {
  font-weight: 800; font-size: clamp(18px, 5vw, 26px); line-height: 1.1;
  color: $stage-yellow;
}
.hr__unit { font-weight: 600; font-size: clamp(9px, 2.4vw, 11px); line-height: 1.4; color: rgba($subject-cream, .82); }

.hr__save {
  display: inline-flex; align-items: center; width: fit-content;
  margin-top: $sp-1;
  border-radius: $r-xs;
  padding: $sp-1 $sp-2;
  background: $subject-cream; color: $subject-ink;
  font-weight: 700; font-size: 11px; line-height: 1.2;
  text-decoration: none;
}
.hr__save:focus-visible { outline: 2px solid $color; outline-offset: 2px; }
.hr__save:active { transform: translateY(1px); }

.hr__meta { margin: $sp-1 0 0; font-size: clamp(9px, 2.4vw, 11px); line-height: 1.5; color: rgba($subject-cream, .82); }
.hr__sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); margin: -1px; }

@media (max-width: 340px) {
  .hr__hint { font-size: 8px; line-height: 1.3; }
  .hr { gap: $sp-1; }
  .hr__field { width: 148px; height: 148px; }
  .hr__win { font-size: 15px; }
  .hr__meta { margin-top: 0; font-size: 8px; line-height: 1.2; }
  .hr__unit { display: none; }
  .hr__side { gap: 0; }
  .hr__save { padding: $sp-1; font-size: 9px; }
}

// reduce — 루프가 안 돈다. 폭죽이 흩어진 정지 한 장이 남는다.
@media (prefers-reduced-motion: reduce) {
  .hr.is-still .hr__field { cursor: default !important; }
}

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);
}

.hr {
  --w1: #a6b4d3;
  --w2: #d9c48f;
  --w3: #a6d3b1;
  --w4: #d8a3b4;
  --w5: #9fc6c2;
  --w6: #c2a8d1;
  --w7: #e0c6a2;
  --w8: #a9c4b0;
  --ink: #17141a;
  --cream: #fff7e6;
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 100%;
  max-width: 436px;
}

.hr__hint {
  margin: 0;
  font-weight: 700;
  font-size: clamp(10px, 2.8vw, 12px);
  line-height: 1.35;
  color: #fff7e6;
}

.hr__row {
  display: flex;
  gap: 8px;
  align-items: stretch;
}

.hr__field {
  position: relative;
  overflow: hidden;
  flex: 0 0 auto;
  width: clamp(176px, 46vw, 228px);
  height: clamp(176px, 46vw, 228px);
  border-radius: 16px;
  background: rgba(255, 247, 230, 0.04);
  box-shadow: inset 0 0 0 1px rgba(255, 247, 230, 0.14);
  cursor: grab;
  touch-action: none;
}

.hr__field:active {
  cursor: grabbing;
}

.hr__field:focus-visible {
  outline: 2px solid #6ec8ff;
  outline-offset: 2px;
}

.hr__cv {
  display: block;
  width: 100%;
  height: 100%;
}

.hr__side {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 4px;
}

.hr__win {
  font-weight: 800;
  font-size: clamp(18px, 5vw, 26px);
  line-height: 1.1;
  color: #ffd23f;
}

.hr__unit {
  font-weight: 600;
  font-size: clamp(9px, 2.4vw, 11px);
  line-height: 1.4;
  color: rgba(255, 247, 230, 0.82);
}

.hr__save {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  margin-top: 4px;
  border-radius: 4px;
  padding: 4px 8px;
  background: #fff7e6;
  color: #17141a;
  font-weight: 700;
  font-size: 11px;
  line-height: 1.2;
  text-decoration: none;
}

.hr__save:focus-visible {
  outline: 2px solid #6ec8ff;
  outline-offset: 2px;
}

.hr__save:active {
  transform: translateY(1px);
}

.hr__meta {
  margin: 4px 0 0;
  font-size: clamp(9px, 2.4vw, 11px);
  line-height: 1.5;
  color: rgba(255, 247, 230, 0.82);
}

.hr__sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  margin: -1px;
}

@media (max-width: 340px) {
  .hr__hint {
    font-size: 8px;
    line-height: 1.3;
  }
  .hr {
    gap: 4px;
  }
  .hr__field {
    width: 148px;
    height: 148px;
  }
  .hr__win {
    font-size: 15px;
  }
  .hr__meta {
    margin-top: 0;
    font-size: 8px;
    line-height: 1.2;
  }
  .hr__unit {
    display: none;
  }
  .hr__side {
    gap: 0;
  }
  .hr__save {
    padding: 4px;
    font-size: 9px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .hr.is-still .hr__field {
    cursor: default !important;
  }
}

// 히어로 씬(09) — 정지 판정 직후 파티클 폭죽을 터뜨리고 당첨명을 크게 올린 뒤 판 전체를
// toDataURL 로 내보낸다. 마찰·틱(스프링)·가중치·탈락 모드를 한 화면에 얹은 히어로다.
// 파티클은 시드 고정 mulberry32 로 뽑는다 — 데모 재현성.
(function () {
  function mulberry32(seed) {
    var a = seed >>> 0;
    return function () {
      a |= 0; a = (a + 0x6D2B79F5) | 0;
      var t = Math.imul(a ^ (a >>> 15), 1 | a);
      t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t;
      return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
    };
  }
  var root = document.getElementById('hr');
  var field = document.getElementById('field');
  var cv = document.getElementById('cv');
  var winEl = document.getElementById('win');
  var saveEl = document.getElementById('save');
  var liveEl = document.getElementById('live');
  if (!root || !field || !cv || !winEl || !saveEl || !liveEl) return;
  var ctx = cv.getContext('2d');
  var css = getComputedStyle(root);
  var PAL = [];
  for (var i = 1; i <= 8; i++) PAL.push(css.getPropertyValue('--w' + i).trim());
  var INK = css.getPropertyValue('--ink').trim();
  var CREAM = css.getPropertyValue('--cream').trim();
  var TAU = Math.PI * 2;
  // 가중치 — 큰 상품은 칸이 넓다
  var PRIZES = [
    { name: 'はずれ', w: 3 },
    { name: 'クッキー', w: 3 },
    { name: 'アメリカーノ', w: 2 },
    { name: 'コーヒーギフト', w: 1 },
    { name: '三角おにぎり', w: 2 },
    { name: '罰ゲーム', w: 2 },
    { name: 'チョコレート', w: 3 },
    { name: '1000ウォン', w: 2 }
  ];
  var TOT = PRIZES.reduce(function (s, p) { return s + p.w; }, 0);
  var bounds = [], acc = 0;
  for (var q = 0; q < PRIZES.length; q++) { bounds.push(acc / TOT); acc += PRIZES[q].w; }
  bounds.push(1);

  var ang = 0, vel = 0;
  var FRICTION = 0.20, STOP = 0.4;      // 낮은 마찰 — 히어로는 길게 돈다
  var pk = 340, pc = 14, pX = 0, pV = 0;
  var lastQ = 0, ticks = 0;
  var settle = -1, pulse = -1, dpr = 1;
  var burst = [];                        // 폭죽 파티클
  var winShow = 0;                       // 결과 표시 애니메이션 (0~1)
  var winner = -1;
  var rnd = mulberry32(90210);
  var flicks = [16, -13, 18];
  var fi = 1, idle = 0;

  function fit() {
    var w = field.clientWidth, h = field.clientHeight;
    dpr = Math.min(2, window.devicePixelRatio || 1);
    cv.width = Math.round(w * dpr); cv.height = Math.round(h * dpr);
  }
  function norm(a) { a %= TAU; return a < 0 ? a + TAU : a; }
  function idxAt(a) {
    var u = norm(-Math.PI / 2 - a);
    for (var k = 0; k < PRIZES.length; k++) if (u >= bounds[k] && u < bounds[k + 1]) return k;
    return PRIZES.length - 1;
  }

  function spawnBurst(cx, cy) {
    for (var i = 0; i < 42; i++) {
      var a = rnd() * TAU, sp = 60 + rnd() * 170;
      burst.push({
        x: cx, y: cy,
        vx: Math.cos(a) * sp, vy: Math.sin(a) * sp - 60,
        rot: rnd() * TAU, vr: (rnd() - 0.5) * 10,
        s: 3 + rnd() * 4,
        col: PAL[Math.floor(rnd() * PAL.length)],
        life: 1
      });
    }
  }

  function draw() {
    var w = cv.width / dpr, h = cv.height / dpr;
    ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
    ctx.clearRect(0, 0, w, h);
    var cx = w / 2, cy = h / 2, R = Math.min(w, h) / 2 - 12;
    // 외곽 후프 — 히어로 판의 테두리
    ctx.beginPath(); ctx.arc(cx, cy, R + 7, 0, TAU);
    ctx.strokeStyle = 'rgba(255,247,230,.25)'; ctx.lineWidth = 5; ctx.stroke();
    ctx.save(); ctx.translate(cx, cy); ctx.rotate(ang);
    for (var k = 0; k < PRIZES.length; k++) {
      var a0 = bounds[k] * TAU, a1 = bounds[k + 1] * TAU;
      ctx.beginPath(); ctx.moveTo(0, 0);
      ctx.arc(0, 0, R, a0, a1); ctx.closePath();
      ctx.fillStyle = PAL[k]; ctx.fill();
      ctx.strokeStyle = 'rgba(23,20,26,.22)'; ctx.lineWidth = 1; ctx.stroke();
      var mid = (a0 + a1) / 2;
      var arcLen = R * (a1 - a0);
      ctx.save(); ctx.rotate(mid);
      ctx.fillStyle = INK;
      var fs = 9;
      ctx.font = '700 ' + fs + 'px sans-serif';
      while (ctx.measureText(PRIZES[k].name).width > arcLen * 0.82 && fs > 5) {
        fs -= 1; ctx.font = '700 ' + fs + 'px sans-serif';
      }
      ctx.textAlign = 'right'; ctx.textBaseline = 'middle';
      ctx.fillText(PRIZES[k].name, R - 11, 0);
      ctx.restore();
    }
    for (var p = 0; p < PRIZES.length; p++) {
      var pa = bounds[p] * TAU;
      ctx.beginPath();
      ctx.arc(Math.cos(pa) * (R - 3), Math.sin(pa) * (R - 3), 2.4, 0, TAU);
      ctx.fillStyle = CREAM; ctx.fill();
    }
    ctx.beginPath(); ctx.arc(0, 0, 14, 0, TAU);
    ctx.fillStyle = CREAM; ctx.fill(); ctx.strokeStyle = 'rgba(23,20,26,.4)'; ctx.stroke();
    if (pulse >= 0) {
      ctx.beginPath(); ctx.arc(0, 0, 14 + pulse * 26, 0, TAU);
      ctx.strokeStyle = 'rgba(255,247,230,' + (1 - pulse) * 0.8 + ')';
      ctx.lineWidth = 2; ctx.stroke();
    }
    ctx.restore();
    // 12시 포인터 — 스프링 변위
    var tipY = cy - R + 7;
    ctx.beginPath();
    ctx.moveTo(cx - 7, cy - R - 9); ctx.lineTo(cx + 7, cy - R - 9); ctx.lineTo(cx + pX, tipY);
    ctx.closePath();
    ctx.fillStyle = CREAM; ctx.fill();
    ctx.strokeStyle = INK; ctx.lineWidth = 1; ctx.stroke();
    // 폭죽 파티클
    for (var b = burst.length - 1; b >= 0; b--) {
      var P = burst[b];
      if (P.life <= 0) { burst.splice(b, 1); continue; }
      ctx.save();
      ctx.translate(P.x, P.y);
      ctx.rotate(P.rot);
      ctx.globalAlpha = Math.max(0, P.life);
      ctx.fillStyle = P.col;
      ctx.fillRect(-P.s / 2, -P.s / 4, P.s, P.s / 2);
      ctx.restore();
    }
    ctx.globalAlpha = 1;
    // 결과 리본 — 허브 아래에서 올라온다 (winShow 0→1)
    if (winShow > 0 && winner >= 0) {
      var lift = (1 - winShow) * 18;
      ctx.save();
      ctx.translate(cx, Math.min(h - 12, cy + R * 0.62) + lift);
      ctx.globalAlpha = Math.min(1, winShow * 1.4);
      var label = winner + 1 + '番 ' + PRIZES[winner].name;
      ctx.font = '800 15px sans-serif';
      var tw = ctx.measureText(label).width;
      ctx.beginPath();
      ctx.roundRect(-tw / 2 - 10, -12, tw + 20, 24, 8);
      ctx.fillStyle = CREAM; ctx.fill();
      ctx.strokeStyle = INK; ctx.lineWidth = 1; ctx.stroke();
      ctx.fillStyle = INK;
      ctx.textAlign = 'center'; ctx.textBaseline = 'middle';
      ctx.fillText(label, 0, 0);
      ctx.restore();
    }
    ctx.globalAlpha = 1;
  }

  function tickCheck() {
    var q2 = Math.floor(ang / (TAU / PRIZES.length));
    if (q2 !== lastQ) {
      var d = q2 - lastQ;
      ticks += Math.abs(d);
      pV += (d > 0 ? 1 : -1) * Math.abs(vel) * 22;
      lastQ = q2;
    }
  }

  function judge() {
    winner = idxAt(ang);
    winEl.textContent = PRIZES[winner].name;
    liveEl.textContent = '当選 ' + PRIZES[winner].name;
    var w = cv.width / dpr, h = cv.height / dpr;
    spawnBurst(w / 2, h / 2);
    winShow = 0.001;
  }

  var drag = { on: false, lastA: 0, lastT: 0, v: 0 };
  function angleAt(e) {
    var b = field.getBoundingClientRect();
    return Math.atan2(e.clientY - (b.top + b.height / 2), e.clientX - (b.left + b.width / 2));
  }
  field.addEventListener('pointerdown', function (e) {
    drag.on = true; drag.lastA = angleAt(e); drag.lastT = performance.now(); drag.v = 0;
    if (field.setPointerCapture) { try { field.setPointerCapture(e.pointerId); } catch (err) { /* 캡처 실패는 회전에 영향 없다 */ } }
  });
  field.addEventListener('pointermove', function (e) {
    if (!drag.on) return;
    var a = angleAt(e), now = performance.now();
    var dA = a - drag.lastA;
    if (dA > Math.PI) dA -= TAU;
    if (dA < -Math.PI) dA += TAU;
    ang += dA;
    var dt = Math.max(1, now - drag.lastT) / 1000;
    drag.v = 0.65 * drag.v + 0.35 * (dA / dt);
    drag.lastA = a; drag.lastT = now;
    tickCheck();
    idle = 0;
  });
  function endDrag() {
    if (!drag.on) return;
    drag.on = false;
    vel = Math.max(-26, Math.min(26, drag.v));
    if (Math.abs(vel) < 1.5) vel = flicks[0];
    settle = -1; pulse = -1; winShow = 0;
  }
  field.addEventListener('pointerup', endDrag);
  field.addEventListener('pointercancel', endDrag);
  field.addEventListener('keydown', function (e) {
    if (e.key === ' ' || e.key === 'Enter') {
      e.preventDefault();
      vel = flicks[fi++ % flicks.length];
      settle = -1; pulse = -1; winShow = 0; idle = 0;
    }
  });

  saveEl.addEventListener('click', function (e) {
    e.preventDefault();
    try {
      saveEl.href = cv.toDataURL('image/png');
    } catch (err) { /* 데이터 URL 실패 시 기본 링크 유지 */ }
  });

  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  var last = performance.now();
  function step(now) {
    var dt = Math.min(64, now - last) / 1000; last = now;
    // 포인터 스프링 적분
    var acc = -pk * pX - pc * pV;
    pV += acc * dt; pX += pV * dt;
    if (Math.abs(pX) < 0.02 && Math.abs(pV) < 1) { pX = 0; pV = 0; }
    // 파티클 물리 — 중력 + 감쇠
    for (var i = 0; i < burst.length; i++) {
      var P = burst[i];
      P.vy += 220 * dt;
      P.x += P.vx * dt; P.y += P.vy * dt;
      P.rot += P.vr * dt;
      P.life -= dt * 0.75;
    }
    if (winShow > 0 && winShow < 1) winShow = Math.min(1, winShow + dt * 3.2);
    if (!drag.on) {
      if (vel !== 0) {
        ang += vel * dt;
        vel *= Math.pow(FRICTION, dt);
        tickCheck();
        if (Math.abs(vel) < STOP) { vel = 0; settle = 0; pulse = 0; judge(); }
      } else if (idle > 0) { idle -= dt; }
      else if (settle >= 0) {
        settle += dt; pulse = Math.min(1, settle / 0.3);
        if (settle > 1.3) {
          vel = flicks[fi++ % flicks.length];
          settle = -1; pulse = -1; winShow = 0;
        }
      }
    }
    draw();
    requestAnimationFrame(step);
  }

  fit();
  window.addEventListener('resize', fit);
  if (reduce) {
    // 정지 한 장 — 판정·폭죽이 끝난 상태로 고정하고 루프는 돌지 않는다
    ang = -Math.PI / 2 - 1.32;
    winner = idxAt(ang);
    winEl.textContent = PRIZES[winner].name;
    liveEl.textContent = '当選 ' + PRIZES[winner].name;
    winShow = 1;
    // 파티클은 정지 위치에 흩어진 한 장으로 미리 계산
    for (var r2 = 0; r2 < 26; r2++) {
      var a2 = rnd() * TAU, dd = 20 + rnd() * 34;
      burst.push({ x: cv.width / dpr / 2 + Math.cos(a2) * dd, y: cv.height / dpr / 2 + Math.sin(a2) * dd - 10,
        vx: 0, vy: 0, rot: rnd() * TAU, vr: 0, s: 3 + rnd() * 4, col: PAL[Math.floor(rnd() * PAL.length)], life: 1 });
    }
    pulse = 0.35;
    draw();
    root.classList.add('is-still');
  } else {
    vel = flicks[0];
    requestAnimationFrame(step);
  }
})();

// SpinWheelHeroScene — vanilla 판(run/332/demo/09-spin-wheel-hero-scene/index.html) 의 React 포트.
// 마찰·틱(스프링)·가중치·탈락을 한 화면에 얹은 히어로다. 정지 판정 직후 파티클 폭죽(42알, 중력
// + 감쇠)이 터지고 당첨명 리본이 허브 아래에서 올라온다(winShow 0→1). 파티클은 시드 고정
// mulberry32(90210) 로 뽑는다 — 데모 재현성. 저장 버튼은 판을 toDataURL 로 내보낸다.
// 움직임은 전부 캔버스 rAF 루프가 그리므로 CSS 애니메이션이 없다.
import { useEffect, useRef, useState } from "react";
import type { CSSProperties, PointerEvent, MouseEvent } from "react";
import styles from "./SpinWheelHeroScene.module.scss";

// demo.py 의 ambient react 스텁은 KeyboardEvent 를 export 하지 않는다 — 최소 자체 타입으로 대체
type KeyEvt = { key: string; preventDefault(): void };

export type SpinWheelHeroSceneProps = {
  duration?: string;
  easing?: string;
  color?: string;
};

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };
type Box<T> = { current: T };
type Particle = {
  x: number; y: number; vx: number; vy: number;
  rot: number; vr: number; s: number; col: string; life: number;
};

function mulberry32(seed: number): () => number {
  let a = seed >>> 0;
  return function () {
    a |= 0; a = (a + 0x6D2B79F5) | 0;
    let t = Math.imul(a ^ (a >>> 15), 1 | a);
    t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t;
    return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
  };
}

const TAU = Math.PI * 2;
// 가중치 — 큰 상품은 칸이 넓다
const PRIZES = [
  { name: "꽝", w: 3 },
  { name: "쿠키", w: 3 },
  { name: "아메리카노", w: 2 },
  { name: "커피 기프티콘", w: 1 },
  { name: "삼각김밥", w: 2 },
  { name: "벌칙", w: 2 },
  { name: "초콜릿", w: 3 },
  { name: "1000원", w: 2 }
];
const TOT = PRIZES.reduce((s, p) => s + p.w, 0);
function computeBounds(): number[] {
  const bounds: number[] = [];
  let acc = 0;
  for (let q = 0; q < PRIZES.length; q++) { bounds.push(acc / TOT); acc += PRIZES[q].w; }
  bounds.push(1);
  return bounds;
}
const BOUNDS = computeBounds();

const FRICTION = 0.20, STOP = 0.4;      // 낮은 마찰 — 히어로는 길게 돈다
const PK = 340, PC = 14;
const FLICKS = [16, -13, 18];
const PAL = ["#a6b4d3", "#d9c48f", "#a6d3b1", "#d8a3b4", "#9fc6c2", "#c2a8d1", "#e0c6a2", "#a9c4b0"];
const INK = "#17141a";
const CREAM = "#fff7e6";
const HINT = "정지 판정 직후 폭죽이 터지고 결과를 올립니다 — 저장 버튼은 판을 toDataURL 로 내보냅니다";
const ARIA_FIELD = "룰렛 히어로";
const UNIT = "정지하면 결과가 크게 오릅니다";
const SAVE_LABEL = "판 저장하기";
const META_ALL = "마찰·틱·가중치·탈락을 한 화면에";
const READY = "READY";

export default function SpinWheelHeroScene({
  duration = "2s",
  easing = "ease-spring",
  color = "#6ec8ff"
}: SpinWheelHeroSceneProps) {
  const fieldRef = useRef<HTMLDivElement | null>(null);
  const cvRef = useRef<HTMLCanvasElement | null>(null);
  const winRef = useRef<HTMLSpanElement | null>(null);
  const saveRef = useRef<HTMLAnchorElement | null>(null);
  const liveRef = useRef<HTMLDivElement | null>(null);
  const ctxRef = useRef<CanvasRenderingContext2D | null>(null);
  const rndRef = useRef(mulberry32(90210)) as Box<() => number>;
  const stRef = useRef({
    ang: 0, vel: 0, pX: 0, pV: 0, lastQ: 0,
    settle: -1, pulse: -1, dpr: 1,
    burst: [] as Particle[], winShow: 0, winner: -1,
    fi: 1, idle: 0,
    drag: { on: false, lastA: 0, lastT: 0, v: 0 }
  }) as Box<{
    ang: number; vel: number; pX: number; pV: number; lastQ: number;
    settle: number; pulse: number; dpr: number;
    burst: Particle[]; winShow: number; winner: number;
    fi: number; idle: number;
    drag: { on: boolean; lastA: number; lastT: number; v: number };
  }>;
  const lastRef = useRef(0) as Box<number>;
  const rafRef = useRef(0) as Box<number>;
  const [still, setStill] = useState(false);

  function reduced(): boolean {
    return window.matchMedia("(prefers-reduced-motion: reduce)").matches;
  }

  function fit(): void {
    const st = stRef.current;
    const field = fieldRef.current, cv = cvRef.current;
    if (!field || !cv) return;
    const ctx = cv.getContext("2d");
    if (!ctx) return;
    st.dpr = Math.min(2, window.devicePixelRatio || 1);
    cv.width = Math.round(field.clientWidth * st.dpr);
    cv.height = Math.round(field.clientHeight * st.dpr);
    ctxRef.current = ctx;
  }

  function norm(a: number): number {
    const r = a % TAU;
    return r < 0 ? r + TAU : r;
  }
  function idxAt(a: number): number {
    const u = norm(-Math.PI / 2 - a);
    for (let k = 0; k < PRIZES.length; k++) if (u >= BOUNDS[k] && u < BOUNDS[k + 1]) return k;
    return PRIZES.length - 1;
  }

  function spawnBurst(cx: number, cy: number): void {
    const st = stRef.current;
    const rnd = rndRef.current;
    for (let i = 0; i < 42; i++) {
      const a = rnd() * TAU, sp = 60 + rnd() * 170;
      st.burst.push({
        x: cx, y: cy,
        vx: Math.cos(a) * sp, vy: Math.sin(a) * sp - 60,
        rot: rnd() * TAU, vr: (rnd() - 0.5) * 10,
        s: 3 + rnd() * 4,
        col: PAL[Math.floor(rnd() * PAL.length)],
        life: 1
      });
    }
  }

  function draw(): void {
    const st = stRef.current;
    const ctx = ctxRef.current;
    if (!ctx) return;
    const w = cvRef.current!.width / st.dpr, h = cvRef.current!.height / st.dpr;
    ctx.setTransform(st.dpr, 0, 0, st.dpr, 0, 0);
    ctx.clearRect(0, 0, w, h);
    const cx = w / 2, cy = h / 2, R = Math.min(w, h) / 2 - 12;
    // 외곽 후프 — 히어로 판의 테두리
    ctx.beginPath(); ctx.arc(cx, cy, R + 7, 0, TAU);
    ctx.strokeStyle = "rgba(255,247,230,.25)"; ctx.lineWidth = 5; ctx.stroke();
    ctx.save(); ctx.translate(cx, cy); ctx.rotate(st.ang);
    for (let k = 0; k < PRIZES.length; k++) {
      const a0 = BOUNDS[k] * TAU, a1 = BOUNDS[k + 1] * TAU;
      ctx.beginPath(); ctx.moveTo(0, 0);
      ctx.arc(0, 0, R, a0, a1); ctx.closePath();
      ctx.fillStyle = PAL[k]; ctx.fill();
      ctx.strokeStyle = "rgba(23,20,26,.22)"; ctx.lineWidth = 1; ctx.stroke();
      const mid = (a0 + a1) / 2;
      const arcLen = R * (a1 - a0);
      ctx.save(); ctx.rotate(mid);
      ctx.fillStyle = INK;
      let fs = 9;
      ctx.font = "700 " + fs + "px sans-serif";
      while (ctx.measureText(PRIZES[k].name).width > arcLen * 0.82 && fs > 5) {
        fs -= 1; ctx.font = "700 " + fs + "px sans-serif";
      }
      ctx.textAlign = "right"; ctx.textBaseline = "middle";
      ctx.fillText(PRIZES[k].name, R - 11, 0);
      ctx.restore();
    }
    for (let p = 0; p < PRIZES.length; p++) {
      const pa = BOUNDS[p] * TAU;
      ctx.beginPath();
      ctx.arc(Math.cos(pa) * (R - 3), Math.sin(pa) * (R - 3), 2.4, 0, TAU);
      ctx.fillStyle = CREAM; ctx.fill();
    }
    ctx.beginPath(); ctx.arc(0, 0, 14, 0, TAU);
    ctx.fillStyle = CREAM; ctx.fill(); ctx.strokeStyle = "rgba(23,20,26,.4)"; ctx.stroke();
    if (st.pulse >= 0) {
      ctx.beginPath(); ctx.arc(0, 0, 14 + st.pulse * 26, 0, TAU);
      ctx.strokeStyle = "rgba(255,247,230," + (1 - st.pulse) * 0.8 + ")";
      ctx.lineWidth = 2; ctx.stroke();
    }
    ctx.restore();
    // 12시 포인터 — 스프링 변위
    const tipY = cy - R + 7;
    ctx.beginPath();
    ctx.moveTo(cx - 7, cy - R - 9); ctx.lineTo(cx + 7, cy - R - 9); ctx.lineTo(cx + st.pX, tipY);
    ctx.closePath();
    ctx.fillStyle = CREAM; ctx.fill();
    ctx.strokeStyle = INK; ctx.lineWidth = 1; ctx.stroke();
    // 폭죽 파티클
    for (let b = st.burst.length - 1; b >= 0; b--) {
      const P = st.burst[b];
      if (P.life <= 0) { st.burst.splice(b, 1); continue; }
      ctx.save();
      ctx.translate(P.x, P.y);
      ctx.rotate(P.rot);
      ctx.globalAlpha = Math.max(0, P.life);
      ctx.fillStyle = P.col;
      ctx.fillRect(-P.s / 2, -P.s / 4, P.s, P.s / 2);
      ctx.restore();
    }
    ctx.globalAlpha = 1;
    // 결과 리본 — 허브 아래에서 올라온다 (winShow 0→1)
    if (st.winShow > 0 && st.winner >= 0) {
      const lift = (1 - st.winShow) * 18;
      ctx.save();
      ctx.translate(cx, Math.min(h - 12, cy + R * 0.62) + lift);
      ctx.globalAlpha = Math.min(1, st.winShow * 1.4);
      const label = st.winner + 1 + "번 " + PRIZES[st.winner].name;
      ctx.font = "800 15px sans-serif";
      const tw = ctx.measureText(label).width;
      ctx.beginPath();
      ctx.roundRect(-tw / 2 - 10, -12, tw + 20, 24, 8);
      ctx.fillStyle = CREAM; ctx.fill();
      ctx.strokeStyle = INK; ctx.lineWidth = 1; ctx.stroke();
      ctx.fillStyle = INK;
      ctx.textAlign = "center"; ctx.textBaseline = "middle";
      ctx.fillText(label, 0, 0);
      ctx.restore();
    }
    ctx.globalAlpha = 1;
  }

  function tickCheck(): void {
    const st = stRef.current;
    const q2 = Math.floor(st.ang / (TAU / PRIZES.length));
    if (q2 !== st.lastQ) {
      const d = q2 - st.lastQ;
      st.pV += (d > 0 ? 1 : -1) * Math.abs(st.vel) * 22;
      st.lastQ = q2;
    }
  }

  function judge(): void {
    const st = stRef.current;
    st.winner = idxAt(st.ang);
    const win = winRef.current, live = liveRef.current;
    if (win) win.textContent = PRIZES[st.winner].name;
    if (live) live.textContent = "당첨 " + PRIZES[st.winner].name;
    const w = cvRef.current!.width / st.dpr, h = cvRef.current!.height / st.dpr;
    spawnBurst(w / 2, h / 2);
    st.winShow = 0.001;
  }

  function angleAt(e: PointerEvent<HTMLDivElement>): number {
    const b = e.currentTarget.getBoundingClientRect();
    return Math.atan2(e.clientY - (b.top + b.height / 2), e.clientX - (b.left + b.width / 2));
  }
  function onPointerDown(e: PointerEvent<HTMLDivElement>): void {
    const st = stRef.current;
    st.drag.on = true; st.drag.lastA = angleAt(e); st.drag.lastT = performance.now(); st.drag.v = 0;
    try { e.currentTarget.setPointerCapture(e.pointerId); } catch { /* 캡처 실패는 회전에 영향 없다 */ }
  }
  function onPointerMove(e: PointerEvent<HTMLDivElement>): void {
    const st = stRef.current;
    if (!st.drag.on) return;
    const a = angleAt(e), now = performance.now();
    let dA = a - st.drag.lastA;
    if (dA > Math.PI) dA -= TAU;
    if (dA < -Math.PI) dA += TAU;
    st.ang += dA;
    const dt = Math.max(1, now - st.drag.lastT) / 1000;
    st.drag.v = 0.65 * st.drag.v + 0.35 * (dA / dt);
    st.drag.lastA = a; st.drag.lastT = now;
    tickCheck();
    st.idle = 0;
  }
  function endDrag(): void {
    const st = stRef.current;
    if (!st.drag.on) return;
    st.drag.on = false;
    st.vel = Math.max(-26, Math.min(26, st.drag.v));
    if (Math.abs(st.vel) < 1.5) st.vel = FLICKS[0];
    st.settle = -1; st.pulse = -1; st.winShow = 0;
  }
  function onKeyDown(e: KeyEvt): void {
    const st = stRef.current;
    if (e.key === " " || e.key === "Enter") {
      e.preventDefault();
      st.vel = FLICKS[st.fi++ % FLICKS.length];
      st.settle = -1; st.pulse = -1; st.winShow = 0; st.idle = 0;
    }
  }
  function onSaveClick(e: MouseEvent<HTMLAnchorElement>): void {
    e.preventDefault();
    const cv = cvRef.current, save = saveRef.current;
    if (!cv || !save) return;
    try { save.href = cv.toDataURL("image/png"); } catch { /* 데이터 URL 실패 시 기본 링크 유지 */ }
  }

  function step(now: number): void {
    const st = stRef.current;
    const dt = Math.min(64, now - lastRef.current) / 1000; lastRef.current = now;
    // 포인터 스프링 적분
    const acc = -PK * st.pX - PC * st.pV;
    st.pV += acc * dt; st.pX += st.pV * dt;
    if (Math.abs(st.pX) < 0.02 && Math.abs(st.pV) < 1) { st.pX = 0; st.pV = 0; }
    // 파티클 물리 — 중력 + 감쇠
    for (let i = 0; i < st.burst.length; i++) {
      const P = st.burst[i];
      P.vy += 220 * dt;
      P.x += P.vx * dt; P.y += P.vy * dt;
      P.rot += P.vr * dt;
      P.life -= dt * 0.75;
    }
    if (st.winShow > 0 && st.winShow < 1) st.winShow = Math.min(1, st.winShow + dt * 3.2);
    if (!st.drag.on) {
      if (st.vel !== 0) {
        st.ang += st.vel * dt;
        st.vel *= Math.pow(FRICTION, dt);
        tickCheck();
        if (Math.abs(st.vel) < STOP) { st.vel = 0; st.settle = 0; st.pulse = 0; judge(); }
      } else if (st.idle > 0) { st.idle -= dt; }
      else if (st.settle >= 0) {
        st.settle += dt; st.pulse = Math.min(1, st.settle / 0.3);
        if (st.settle > 1.3) {
          st.vel = FLICKS[st.fi++ % FLICKS.length];
          st.settle = -1; st.pulse = -1; st.winShow = 0;
        }
      }
    }
    draw();
    rafRef.current = requestAnimationFrame(step);
  }

  useEffect(() => {
    fit();
    function onResize(): void { fit(); }
    window.addEventListener("resize", onResize);
    if (reduced()) {
      // 정지 한 장 — 판정·폭죽이 끝난 상태로 고정하고 루프는 돌지 않는다
      const st = stRef.current;
      const rnd = rndRef.current;
      st.ang = -Math.PI / 2 - 1.32;
      st.winner = idxAt(st.ang);
      const win = winRef.current, live = liveRef.current;
      if (win) win.textContent = PRIZES[st.winner].name;
      if (live) live.textContent = "당첨 " + PRIZES[st.winner].name;
      st.winShow = 1;
      // 파티클은 정지 위치에 흩어진 한 장으로 미리 계산
      for (let r2 = 0; r2 < 26; r2++) {
        const a2 = rnd() * TAU, dd = 20 + rnd() * 34;
        st.burst.push({
          x: cvRef.current!.width / st.dpr / 2 + Math.cos(a2) * dd,
          y: cvRef.current!.height / st.dpr / 2 + Math.sin(a2) * dd - 10,
          vx: 0, vy: 0, rot: rnd() * TAU, vr: 0, s: 3 + rnd() * 4,
          col: PAL[Math.floor(rnd() * PAL.length)], life: 1
        });
      }
      st.pulse = 0.35;
      draw();
      setStill(true);
    } else {
      stRef.current.vel = FLICKS[0];
      lastRef.current = performance.now();
      rafRef.current = requestAnimationFrame(step);
    }
    return () => {
      window.removeEventListener("resize", onResize);
      cancelAnimationFrame(rafRef.current);
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  const rootCls = still ? styles.hr + " " + styles.isStill : styles.hr;
  return (
    <main className={styles.stage}>
      <div className={rootCls} style={{ "--duration": duration, "--easing": easing, "--color": color } as Vars}>
        <p className={styles.hint}>{HINT}</p>
        <div className={styles.row}>
          <div
            className={styles.field}
            ref={fieldRef}
            role="application"
            aria-label={ARIA_FIELD}
            tabIndex={0}
            onKeyDown={onKeyDown}
            onPointerDown={onPointerDown}
            onPointerMove={onPointerMove}
            onPointerUp={endDrag}
            onPointerCancel={endDrag}
          >
            <canvas className={styles.cv} ref={cvRef}></canvas>
          </div>
          <div className={styles.side}>
            <b className={styles.win} ref={winRef}>{READY}</b>
            <span className={styles.unit}>{UNIT}</span>
            <a className={styles.save} ref={saveRef} href="#" download="roulette.png" onClick={onSaveClick}>
              {SAVE_LABEL}
            </a>
            <p className={styles.meta}>{META_ALL}</p>
            <div className={styles.sr} ref={liveRef} aria-live="polite"></div>
          </div>
        </div>
      </div>
    </main>
  );
}