05Long block that folds until you open it

<main class="stage">
  <div class="ecb is-demo" id="root">
    <div class="pane">
      <div class="pane__head">
        <span class="pane__file">
          <svg class="ic" viewBox="0 0 256 256" width="14" height="14" aria-hidden="true"><g fill="currentColor"><path d="m240 128l-48 40H64l-48-40l48-40h128Z" opacity=".2"/><path d="M69.12 94.15L28.5 128l40.62 33.85a8 8 0 1 1-10.24 12.29l-48-40a8 8 0 0 1 0-12.29l48-40a8 8 0 0 1 10.24 12.3m176 27.7l-48-40a8 8 0 1 0-10.24 12.3L227.5 128l-40.62 33.85a8 8 0 1 0 10.24 12.29l48-40a8 8 0 0 0 0-12.29m-82.39-89.37a8 8 0 0 0-10.25 4.79l-64 176a8 8 0 0 0 4.79 10.26A8.1 8.1 0 0 0 96 224a8 8 0 0 0 7.52-5.27l64-176a8 8 0 0 0-4.79-10.25"/></g></svg>
          config.js
        </span>
      </div>
      <div class="pane__body">
        <pre class="ecb__peek" id="peek"><code><span class="k">export</span> <span class="k">const</span> config = {
  theme: <span class="s">"auto"</span>,
  duration: <span class="n">220</span>,
  easing: <span class="s">"ease-out"</span>,<span class="ecb__more" id="more"><span class="ecb__moreInner"><span class="ecb__line">  radius: <span class="n">12</span>,</span><span class="ecb__line">  shadow: <span class="k">true</span>,</span><span class="ecb__line">  locale: <span class="s">"en-US"</span>,</span><span class="ecb__line">  retry: <span class="n">3</span>,</span><span class="ecb__line">};</span></span></span></code></pre>
        <span class="ecb__fade" aria-hidden="true"></span>
      </div>
      <div class="ecb__toggleRow">
        <button class="ecb__toggle" id="toggleBtn" type="button" aria-expanded="false" aria-controls="more">
          <span class="ecb__labelWrap">
            <span class="ecb__label ecb__label--more" id="labelMore">Show more</span>
            <span class="ecb__label ecb__label--less" id="labelLess" aria-hidden="true">Collapse</span>
          </span>
          <svg class="ic ecb__caret" viewBox="0 0 256 256" width="12" height="12" aria-hidden="true"><g fill="currentColor"><path d="m208 96l-80 80l-80-80Z" opacity=".2"/><path d="M215.39 92.94A8 8 0 0 0 208 88H48a8 8 0 0 0-5.66 13.66l80 80a8 8 0 0 0 11.32 0l80-80a8 8 0 0 0 1.73-8.72M128 164.69L67.31 104h121.38Z"/></g></svg>
        </button>
      </div>
    </div>
    <span class="ecb__cursor" id="cursor" aria-hidden="true"></span>
  </div>
</main>

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

$duration: $dur-enter;
$easing: $ease-out;
$color: $stage-orange;

@include stage($stage-ink);

.ecb {
  position: relative;
}

.pane {
  box-sizing: border-box;
  width: 288px;
  border-radius: $r-card;
  overflow: hidden;
  box-shadow: $shadow-raised;
  background: $subject-cream;
  color: $subject-ink;
}

.pane__head {
  box-sizing: border-box;
  display: flex;
  align-items: center;
  height: 28px;
  padding: 0 $sp-3;
  background: rgba(23, 20, 26, .06);
  border-bottom: 1px solid rgba(23, 20, 26, .12);
}
.pane__file {
  display: flex;
  align-items: center;
  gap: $sp-1;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-size: 11px;
  font-weight: 700;
  color: rgba($subject-ink, .72);
}
.pane__file .ic { flex: none; }

.pane__body {
  position: relative;
  box-sizing: border-box;
  padding: $sp-3;
}
.ecb__peek {
  margin: 0;
  font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 11px;
  line-height: 18px;
  white-space: pre;
}
.ecb__peek code { font: inherit; }
.k { color: $subject-orange-deep; }
.s { color: $subject-blue-deep; }
.n { color: $error; }

// 접힘/펼침 — grid-template-rows 0fr → 1fr, 고정 높이 없이 실제 콘텐츠 높이로 보간
.ecb__more {
  display: grid;
  grid-template-rows: 0fr;
}
// 실제 상호작용(비-데모)일 때만 transition — is-demo 루프는 keyframe 애니메이션만 쓴다
// (같은 속성에 transition 과 animation 을 동시에 걸면 강제 currentTime 재생 시 충돌해
// 접힘이 여러 프레임에 걸쳐 보간되지 않고 한 프레임에 훅 꺼지는 문제가 있었다)
.ecb:not(.is-demo) .ecb__more {
  transition: grid-template-rows $duration $easing;
}
.ecb.is-open .ecb__more { grid-template-rows: 1fr; }
.ecb__moreInner {
  position: relative;
  overflow: hidden;
  min-height: 0;
}
.ecb__line { display: block; }

// 바닥 페이드 띠 — 접힌 상태에서만 보인다
.ecb__fade {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 32px;
  background: linear-gradient(to bottom, rgba(255, 247, 230, 0), $subject-cream);
  pointer-events: none;
}
.ecb.is-open .ecb__fade { opacity: 0; }

.ecb__toggleRow {
  box-sizing: border-box;
  padding: 0 $sp-3 $sp-3;
}
.ecb__toggle {
  box-sizing: border-box;
  display: inline-flex;
  align-items: center;
  gap: $sp-1;
  height: 24px;
  padding: 0 $sp-2;
  border: 0;
  border-radius: $r-pill;
  background: rgba(23, 20, 26, .08);
  color: inherit;
  cursor: pointer;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-size: 11px;
  font-weight: 700;
  transition: transform $dur-quick $easing, background $dur-quick $easing;
}
.ecb__toggle:hover { background: rgba(23, 20, 26, .14); }
.ecb__toggle:focus-visible { outline: 2px solid $color; outline-offset: 2px; }

// 라벨 두 장을 겹쳐 놓고 opacity 만 바꾼다(레이아웃이 안 흔들린다) — pane__copy 의 copy__state 방식과 동일
.ecb__labelWrap {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 14px;
}
.ecb__label {
  position: absolute;
  inset: 0;
  white-space: nowrap;
  transition: opacity $dur-quick $easing;
}
.ecb__label--more { opacity: 1; }
.ecb__label--less { opacity: 0; }
.ecb.is-open .ecb__label--more { opacity: 0; }
.ecb.is-open .ecb__label--less { opacity: 1; }

.ecb__caret {
  flex: none;
  transition: transform $dur-quick $easing;
}
.ecb.is-open .ecb__caret { transform: rotate(180deg); }

.ecb__cursor {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 3;
  width: 12px;
  height: 12px;
  border: 2px solid $subject-cream;
  border-radius: 50%;
  background: $subject-ink;
  box-shadow: $shadow-press;
  pointer-events: none;
  opacity: 0;
  transform: translate(252px, 16px);
}
.ecb.is-demo .ecb__cursor { opacity: 1; }

// ── 자동 루프 (2s) ────────────────────────────────────
// 함정1 대책: 46-62%(펼침 마무리, 다섯 줄 등장)에서 면적 변화가 가장 크게 남도록,
// 64% 재접힘 직전(62%)에 여분 줄 텍스트를 opacity 0 으로 먼저 비워 둔다.
// 이후 grid-template-rows 1fr→0fr 재접힘은 "이미 빈 영역"을 접는 것이라 픽셀 변화가 작다.
// 접힘 구간도 0.16 (32%, 0.64s) 로 펼침(0.28, 0.56s)보다 넓게 잡아 프레임당 변화율을 낮춘다.
.ecb.is-demo .ecb__more {
  animation-name: ecb-grid;
  animation-duration: $dur-loop;
  animation-timing-function: $easing;
  animation-iteration-count: infinite;
}
.ecb.is-demo .ecb__fade {
  animation-name: ecb-fade;
  animation-duration: $dur-loop;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}
.ecb.is-demo .ecb__caret {
  animation-name: ecb-caret;
  animation-duration: $dur-loop;
  animation-timing-function: $easing;
  animation-iteration-count: infinite;
}
.ecb.is-demo .ecb__toggle {
  animation-name: ecb-press;
  animation-duration: $dur-loop;
  animation-timing-function: $ease-pop;
  animation-iteration-count: infinite;
}
.ecb.is-demo .ecb__label--more,
.ecb.is-demo .ecb__label--less {
  animation-duration: $dur-loop;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.ecb.is-demo .ecb__label--more { animation-name: ecb-label-more; }
.ecb.is-demo .ecb__label--less { animation-name: ecb-label-less; }
.ecb.is-demo .ecb__moreInner .ecb__line {
  opacity: 0;
  animation-name: ecb-line;
  animation-duration: $dur-loop;
  animation-timing-function: $easing;
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}
@for $i from 1 through 5 {
  .ecb.is-demo .ecb__moreInner .ecb__line:nth-child(#{$i}) {
    animation-delay: ($i - 1) * 0.015s;
  }
}
.ecb.is-demo .ecb__cursor {
  animation-name: ecb-cursor;
  animation-duration: $dur-loop;
  animation-timing-function: $ease-spring;
  animation-iteration-count: infinite;
}

// fr 값 하나로만 62%→86% 를 맡기면 크롬이 변화를 앞쪽 몇 프레임에 몰아
// 한 프레임에 훅 접히는 것처럼 보인다(실측). 촘촘한 중간 정지점을 직접 박아
// 프레임마다 변화폭을 고르게 나눈다 — 펼침 쪽도 대칭으로 맞춘다.
// (poster 수정: 하이라이트 막을 없애고, 줄은 접힘이 시작되는 86%까지 완전 불투명하게
// 유지한다 — 62~86% 사이 "펼쳐진 빈 상자"가 반투명 유령으로 보이던 문제 대책)
@keyframes ecb-grid {
  0%, 14%   { grid-template-rows: 0fr; }
  20%       { grid-template-rows: .12fr; }
  26%       { grid-template-rows: .32fr; }
  32%       { grid-template-rows: .55fr; }
  38%       { grid-template-rows: .8fr; }
  44%, 62%  { grid-template-rows: 1fr; }
  68%       { grid-template-rows: .8fr; }
  74%       { grid-template-rows: .55fr; }
  80%       { grid-template-rows: .32fr; }
  83%       { grid-template-rows: .16fr; }
  86%, 100% { grid-template-rows: 0fr; }
}
@keyframes ecb-fade {
  0%, 14%   { opacity: 1; }
  30%       { opacity: 0; }
  88%       { opacity: 0; }
  96%, 100% { opacity: 1; }
}
// 카레트·라벨은 접힘이 거의 끝나는 84% 에 함께 되돌아온다.
// 63% 에 되돌리면 아직 펼쳐진 창에 「더 보기」가 적혀 화면이 거짓말을 한다 (poster 육안 실측)
@keyframes ecb-caret {
  0%, 14%   { transform: rotate(0deg); }
  40%, 83%  { transform: rotate(180deg); }
  84%, 100% { transform: rotate(0deg); }
}
@keyframes ecb-press {
  0%, 12%  { transform: scale(1); }
  14%      { transform: scale(.94); }
  18%, 100% { transform: scale(1); }
}
@keyframes ecb-label-more {
  0%, 15%   { opacity: 1; }
  16%, 83%  { opacity: 0; }
  84%, 100% { opacity: 1; }
}
@keyframes ecb-label-less {
  0%, 15%   { opacity: 0; }
  16%, 83%  { opacity: 1; }
  84%, 100% { opacity: 0; }
}
// 다섯 줄 등장 — translateY(6px) → 0, 46~60% 안에 끝내고 접힘이 시작되는 86%까지
// 완전 불투명을 유지한다(62~86% 사이 반투명 유령 방지). 사라짐은 접힘과 함께.
@keyframes ecb-line {
  0%, 44%   { opacity: 0; transform: translateY(6px); }
  60%, 86%  { opacity: 1; transform: translateY(0); }
  100%      { opacity: 0; transform: translateY(6px); }
}
// 커서는 86% 안에 처음 자리로 돌아와 그 뒤로는 가만히 있는다(텔레포트 금지).
@keyframes ecb-cursor {
  0%, 2%    { transform: translate(252px, 16px); }
  12%, 74%  { transform: translate(48px, 138px); }
  86%, 100% { transform: translate(252px, 16px); }
}

@media (max-width: 340px) {
  .pane { width: 100%; }
  .ecb__peek { font-size: 10px; line-height: 16px; }
  .pane__body { padding: $sp-2; }
  .ecb__toggleRow { padding: 0 $sp-2 $sp-2; }
}

@media (prefers-reduced-motion: reduce) {
  .ecb.is-demo .ecb__more,
  .ecb.is-demo .ecb__fade,
  .ecb.is-demo .ecb__caret,
  .ecb.is-demo .ecb__toggle,
  .ecb.is-demo .ecb__label--more,
  .ecb.is-demo .ecb__label--less,
  .ecb.is-demo .ecb__moreInner .ecb__line,
  .ecb.is-demo .ecb__cursor { animation: none !important; }
  .ecb.is-demo .ecb__more { grid-template-rows: 0fr; }
  .ecb.is-demo .ecb__cursor { opacity: 0; }
}

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);
}

.ecb {
  position: relative;
}

.pane {
  box-sizing: border-box;
  width: 288px;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  background: #fff7e6;
  color: #17141a;
}

.pane__head {
  box-sizing: border-box;
  display: flex;
  align-items: center;
  height: 28px;
  padding: 0 12px;
  background: rgba(23, 20, 26, 0.06);
  border-bottom: 1px solid rgba(23, 20, 26, 0.12);
}

.pane__file {
  display: flex;
  align-items: center;
  gap: 4px;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-size: 11px;
  font-weight: 700;
  color: rgba(23, 20, 26, 0.72);
}

.pane__file .ic {
  flex: none;
}

.pane__body {
  position: relative;
  box-sizing: border-box;
  padding: 12px;
}

.ecb__peek {
  margin: 0;
  font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 11px;
  line-height: 18px;
  white-space: pre;
}

.ecb__peek code {
  font: inherit;
}

.k {
  color: #c93000;
}

.s {
  color: #0a4fe8;
}

.n {
  color: #c2361a;
}

.ecb__more {
  display: grid;
  grid-template-rows: 0fr;
}

.ecb:not(.is-demo) .ecb__more {
  transition: grid-template-rows 600ms ease-out;
}

.ecb.is-open .ecb__more {
  grid-template-rows: 1fr;
}

.ecb__moreInner {
  position: relative;
  overflow: hidden;
  min-height: 0;
}

.ecb__line {
  display: block;
}

.ecb__fade {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 32px;
  background: linear-gradient(to bottom, rgba(255, 247, 230, 0), #fff7e6);
  pointer-events: none;
}

.ecb.is-open .ecb__fade {
  opacity: 0;
}

.ecb__toggleRow {
  box-sizing: border-box;
  padding: 0 12px 12px;
}

.ecb__toggle {
  box-sizing: border-box;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 24px;
  padding: 0 8px;
  border: 0;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.08);
  color: inherit;
  cursor: pointer;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-size: 11px;
  font-weight: 700;
  transition: transform 220ms ease-out, background 220ms ease-out;
}

.ecb__toggle:hover {
  background: rgba(23, 20, 26, 0.14);
}

.ecb__toggle:focus-visible {
  outline: 2px solid #ff4d1f;
  outline-offset: 2px;
}

.ecb__labelWrap {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 14px;
}

.ecb__label {
  position: absolute;
  inset: 0;
  white-space: nowrap;
  transition: opacity 220ms ease-out;
}

.ecb__label--more {
  opacity: 1;
}

.ecb__label--less {
  opacity: 0;
}

.ecb.is-open .ecb__label--more {
  opacity: 0;
}

.ecb.is-open .ecb__label--less {
  opacity: 1;
}

.ecb__caret {
  flex: none;
  transition: transform 220ms ease-out;
}

.ecb.is-open .ecb__caret {
  transform: rotate(180deg);
}

.ecb__cursor {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 3;
  width: 12px;
  height: 12px;
  border: 2px solid #fff7e6;
  border-radius: 50%;
  background: #17141a;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  pointer-events: none;
  opacity: 0;
  transform: translate(252px, 16px);
}

.ecb.is-demo .ecb__cursor {
  opacity: 1;
}

.ecb.is-demo .ecb__more {
  animation-name: ecb-grid;
  animation-duration: 2s;
  animation-timing-function: ease-out;
  animation-iteration-count: infinite;
}

.ecb.is-demo .ecb__fade {
  animation-name: ecb-fade;
  animation-duration: 2s;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}

.ecb.is-demo .ecb__caret {
  animation-name: ecb-caret;
  animation-duration: 2s;
  animation-timing-function: ease-out;
  animation-iteration-count: infinite;
}

.ecb.is-demo .ecb__toggle {
  animation-name: ecb-press;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 1.4, 0.4, 1);
  animation-iteration-count: infinite;
}

.ecb.is-demo .ecb__label--more,
.ecb.is-demo .ecb__label--less {
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

.ecb.is-demo .ecb__label--more {
  animation-name: ecb-label-more;
}

.ecb.is-demo .ecb__label--less {
  animation-name: ecb-label-less;
}

.ecb.is-demo .ecb__moreInner .ecb__line {
  opacity: 0;
  animation-name: ecb-line;
  animation-duration: 2s;
  animation-timing-function: ease-out;
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}

.ecb.is-demo .ecb__moreInner .ecb__line:nth-child(1) {
  animation-delay: 0s;
}

.ecb.is-demo .ecb__moreInner .ecb__line:nth-child(2) {
  animation-delay: 0.015s;
}

.ecb.is-demo .ecb__moreInner .ecb__line:nth-child(3) {
  animation-delay: 0.03s;
}

.ecb.is-demo .ecb__moreInner .ecb__line:nth-child(4) {
  animation-delay: 0.045s;
}

.ecb.is-demo .ecb__moreInner .ecb__line:nth-child(5) {
  animation-delay: 0.06s;
}

.ecb.is-demo .ecb__cursor {
  animation-name: ecb-cursor;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}

@keyframes ecb-grid {
  0%, 14% {
    grid-template-rows: 0fr;
  }
  20% {
    grid-template-rows: 0.12fr;
  }
  26% {
    grid-template-rows: 0.32fr;
  }
  32% {
    grid-template-rows: 0.55fr;
  }
  38% {
    grid-template-rows: 0.8fr;
  }
  44%, 62% {
    grid-template-rows: 1fr;
  }
  68% {
    grid-template-rows: 0.8fr;
  }
  74% {
    grid-template-rows: 0.55fr;
  }
  80% {
    grid-template-rows: 0.32fr;
  }
  83% {
    grid-template-rows: 0.16fr;
  }
  86%, 100% {
    grid-template-rows: 0fr;
  }
}
@keyframes ecb-fade {
  0%, 14% {
    opacity: 1;
  }
  30% {
    opacity: 0;
  }
  88% {
    opacity: 0;
  }
  96%, 100% {
    opacity: 1;
  }
}
@keyframes ecb-caret {
  0%, 14% {
    transform: rotate(0deg);
  }
  40%, 83% {
    transform: rotate(180deg);
  }
  84%, 100% {
    transform: rotate(0deg);
  }
}
@keyframes ecb-press {
  0%, 12% {
    transform: scale(1);
  }
  14% {
    transform: scale(0.94);
  }
  18%, 100% {
    transform: scale(1);
  }
}
@keyframes ecb-label-more {
  0%, 15% {
    opacity: 1;
  }
  16%, 83% {
    opacity: 0;
  }
  84%, 100% {
    opacity: 1;
  }
}
@keyframes ecb-label-less {
  0%, 15% {
    opacity: 0;
  }
  16%, 83% {
    opacity: 1;
  }
  84%, 100% {
    opacity: 0;
  }
}
@keyframes ecb-line {
  0%, 44% {
    opacity: 0;
    transform: translateY(6px);
  }
  60%, 86% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(6px);
  }
}
@keyframes ecb-cursor {
  0%, 2% {
    transform: translate(252px, 16px);
  }
  12%, 74% {
    transform: translate(48px, 138px);
  }
  86%, 100% {
    transform: translate(252px, 16px);
  }
}
@media (max-width: 340px) {
  .pane {
    width: 100%;
  }
  .ecb__peek {
    font-size: 10px;
    line-height: 16px;
  }
  .pane__body {
    padding: 8px;
  }
  .ecb__toggleRow {
    padding: 0 8px 8px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .ecb.is-demo .ecb__more,
  .ecb.is-demo .ecb__fade,
  .ecb.is-demo .ecb__caret,
  .ecb.is-demo .ecb__toggle,
  .ecb.is-demo .ecb__label--more,
  .ecb.is-demo .ecb__label--less,
  .ecb.is-demo .ecb__moreInner .ecb__line,
  .ecb.is-demo .ecb__cursor {
    animation: none !important;
  }
  .ecb.is-demo .ecb__more {
    grid-template-rows: 0fr;
  }
  .ecb.is-demo .ecb__cursor {
    opacity: 0;
  }
}

var root = document.getElementById('root');
var btn = document.getElementById('toggleBtn');
var labelMore = document.getElementById('labelMore');
var labelLess = document.getElementById('labelLess');
function setState(open) {
  btn.setAttribute('aria-expanded', open ? 'true' : 'false');
  labelMore.setAttribute('aria-hidden', open ? 'true' : 'false');
  labelLess.setAttribute('aria-hidden', open ? 'false' : 'true');
  root.classList.toggle('is-open', open);
}
btn.addEventListener('click', function () {
  // button 요소는 Enter/Space 를 이미 click 으로 보내므로 별도 keydown 처리가 필요 없다
  root.classList.remove('is-demo');
  setState(btn.getAttribute('aria-expanded') !== 'true');
});

import { useState } from "react";
import type { CSSProperties } from "react";
import styles from "./ExpandCollapsedBlock.module.scss";

export type ExpandCollapsedBlockProps = {
  fileLabel?: string;
  moreLabel?: string;
  lessLabel?: string;
  /** 자동 재생 루프 (갤러리용). 사람이 누르면 꺼진다 */
  demo?: boolean;
  duration?: number;
  easing?: string;
  color?: string;
};

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };

const CodeIcon = () => (
  <svg className={styles.ic} viewBox="0 0 256 256" width="14" height="14" aria-hidden="true">
    <g fill="currentColor">
      <path d="m240 128l-48 40H64l-48-40l48-40h128Z" opacity=".2" />
      <path d="M69.12 94.15L28.5 128l40.62 33.85a8 8 0 1 1-10.24 12.29l-48-40a8 8 0 0 1 0-12.29l48-40a8 8 0 0 1 10.24 12.3m176 27.7l-48-40a8 8 0 1 0-10.24 12.3L227.5 128l-40.62 33.85a8 8 0 1 0 10.24 12.29l48-40a8 8 0 0 0 0-12.29m-82.39-89.37a8 8 0 0 0-10.25 4.79l-64 176a8 8 0 0 0 4.79 10.26A8.1 8.1 0 0 0 96 224a8 8 0 0 0 7.52-5.27l64-176a8 8 0 0 0-4.79-10.25" />
    </g>
  </svg>
);

const CaretIcon = () => (
  <svg className={[styles.ic, styles.caret].join(" ")} viewBox="0 0 256 256" width="12" height="12" aria-hidden="true">
    <g fill="currentColor">
      <path d="m208 96l-80 80l-80-80Z" opacity=".2" />
      <path d="M215.39 92.94A8 8 0 0 0 208 88H48a8 8 0 0 0-5.66 13.66l80 80a8 8 0 0 0 11.32 0l80-80a8 8 0 0 0 1.73-8.72M128 164.69L67.31 104h121.38Z" />
    </g>
  </svg>
);

export default function ExpandCollapsedBlock({
  fileLabel = "config.js",
  moreLabel = "Show more",
  lessLabel = "Collapse",
  demo = true,
  duration = 600,
  easing = "ease-out",
  color = "#ff4d1f",
}: ExpandCollapsedBlockProps) {
  const [live, setLive] = useState(demo);
  const [open, setOpen] = useState(false);

  function onToggle() {
    setLive(false);
    setOpen((v) => !v);
  }

  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <div className={[styles.ecb, live ? styles.isDemo : "", open ? styles.isOpen : ""].join(" ")} style={vars}>
      <div className={styles.pane}>
        <div className={styles.paneHead}>
          <span className={styles.paneFile}>
            <CodeIcon />
            {fileLabel}
          </span>
        </div>
        <div className={styles.paneBody}>
          <pre className={styles.peek}>
            <code>
              <span className={styles.k}>export</span> <span className={styles.k}>const</span> config = {"{"}
              {"\n  "}theme: <span className={styles.s}>&quot;auto&quot;</span>,
              {"\n  "}duration: <span className={styles.n}>220</span>,
              {"\n  "}easing: <span className={styles.s}>&quot;ease-out&quot;</span>,
              <span className={styles.more} id="ecb-react-more">
                <span className={styles.moreInner}>
                  <span className={styles.line}>
                    {"  "}radius: <span className={styles.n}>12</span>,
                  </span>
                  <span className={styles.line}>
                    {"  "}shadow: <span className={styles.k}>true</span>,
                  </span>
                  <span className={styles.line}>
                    {"  "}locale: <span className={styles.s}>&quot;en-US&quot;</span>,
                  </span>
                  <span className={styles.line}>
                    {"  "}retry: <span className={styles.n}>3</span>,
                  </span>
                  <span className={styles.line}>{"};"}</span>
                </span>
              </span>
            </code>
          </pre>
          <span className={styles.fade} aria-hidden="true" />
        </div>
        <div className={styles.toggleRow}>
          <button
            className={styles.toggle}
            type="button"
            aria-expanded={open}
            aria-controls="ecb-react-more"
            onClick={onToggle}
          >
            <span className={styles.labelWrap}>
              <span className={[styles.label, styles.labelMore].join(" ")} aria-hidden={open}>
                {moreLabel}
              </span>
              <span className={[styles.label, styles.labelLess].join(" ")} aria-hidden={!open}>
                {lessLabel}
              </span>
            </span>
            <CaretIcon />
          </button>
        </div>
      </div>
      <span className={styles.ecbCursor} aria-hidden="true" />
    </div>
  );
}