08Popover for Picking Which Collection to Save Into

<main class="stage">
<div class="cp is-demo" id="cp">
  <p class="cp__caption">Save to a folder</p>
  <div class="cp__scene" id="cpScene">
    <button class="cp__btn" id="cpBtn" type="button" aria-pressed="false" aria-expanded="false" aria-haspopup="true">
      <svg class="cp__icon" viewBox="0 0 24 24" width="28" height="28" aria-hidden="true" focusable="false">
        <path class="cp__shape" d="M6.5 3A1.5 1.5 0 0 1 8 1.5h8A1.5 1.5 0 0 1 17.5 3v18.2a.9.9 0 0 1-1.38.76L12 19.1l-4.12 2.86A.9.9 0 0 1 6.5 21.2Z"/>
      </svg>
    </button>
    <div class="cp__panel" id="cpPanel" role="menu">
      <p class="cp__panelTitle">Choose a list to save to</p>
      <button class="cp__item" type="button" role="menuitem" data-name="Reading List">Reading List</button>
      <button class="cp__item" type="button" role="menuitem" data-name="Read Later">Read Later</button>
      <button class="cp__item" type="button" role="menuitem" data-name="Cooking Recipes">Cooking Recipes</button>
    </div>
  </div>
  <p class="cp__status" id="cpStatus" aria-live="polite">Not saved</p>
</div>
</main>

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

// 값 하나: 팝오버가 열린 뒤 경과 시간 → 항목 인덱스 × POPOVER_STAGGER_MS 지연을 지나면 그 항목이 뜬다.

$duration: $dur-base;
$easing: $ease-out;
$color: $subject-blue-deep;

@include stage($stage-orange);

.cp {
  display: grid;
  gap: $sp-3;
  justify-items: center;
  width: 100%;
}

.cp__caption {
  margin: 0;
  font-size: 12px;
  font-weight: 600;
  color: $subject-ink;
}

.cp__scene {
  position: relative;
  width: 260px;
  height: 190px;
  display: flex;
  justify-content: center;
}

.cp__btn {
  position: relative;
  z-index: 2;
  border: 0;
  background: $stage-paper;
  border-radius: $r-pill;
  padding: $sp-4;
  height: max-content;
  cursor: pointer;
  color: $color;
  box-shadow: $shadow-raised;
}

.cp__btn:focus-visible {
  outline: 2px solid $subject-blue-light;
  outline-offset: 3px;
}

.cp__shape {
  fill: none;
  stroke: $color;
  stroke-width: 1.6;
  stroke-linejoin: round;
}

.cp__btn[aria-pressed="true"] .cp__shape {
  fill: $color;
}

.cp__panel {
  position: absolute;
  top: 64px;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
  display: grid;
  gap: $sp-2;
  padding: $sp-4;
  border-radius: $r-card;
  background: $subject-cream;
  box-shadow: $shadow-raised;
  opacity: 0;
  pointer-events: none;
  transition: opacity $duration $easing;
}

.cp__panel--open {
  opacity: 1;
  pointer-events: auto;
}

.cp__panelTitle {
  margin: 0 0 $sp-1;
  font-size: 11px;
  font-weight: 700;
  color: $subject-blue-deep;
}

.cp__item {
  border: 0;
  border-radius: $r-sm;
  background: $subject-sky;
  padding: $sp-2 $sp-3;
  font-size: 12px;
  font-weight: 600;
  color: $subject-ink;
  text-align: left;
  cursor: pointer;
  will-change: transform, opacity;
}

.cp__item:hover,
.cp__item:focus-visible {
  background: $subject-blue-light;
  outline: none;
}

.cp__status {
  margin: 0;
  font-size: 11px;
  color: $subject-ink;
  font-weight: 600;
}

@media (max-width: 340px) {
  .cp__scene { width: 200px; height: 100px; }
  .cp__btn { padding: $sp-3; }
  .cp__panel {
    top: 42px;
    width: 180px;
    padding: $sp-2;
    display: flex;
    flex-wrap: wrap;
    gap: $sp-1;
    justify-content: center;
  }
  .cp__panelTitle { display: none; }
  .cp__item { font-size: 10px; padding: $sp-1 $sp-2; }
}

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

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.cp {
  display: grid;
  gap: 12px;
  justify-items: center;
  width: 100%;
}

.cp__caption {
  margin: 0;
  font-size: 12px;
  font-weight: 600;
  color: #17141a;
}

.cp__scene {
  position: relative;
  width: 260px;
  height: 190px;
  display: flex;
  justify-content: center;
}

.cp__btn {
  position: relative;
  z-index: 2;
  border: 0;
  background: #ffffff;
  border-radius: 999px;
  padding: 16px;
  height: max-content;
  cursor: pointer;
  color: #0a4fe8;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}

.cp__btn:focus-visible {
  outline: 2px solid #5b8cf8;
  outline-offset: 3px;
}

.cp__shape {
  fill: none;
  stroke: #0a4fe8;
  stroke-width: 1.6;
  stroke-linejoin: round;
}

.cp__btn[aria-pressed=true] .cp__shape {
  fill: #0a4fe8;
}

.cp__panel {
  position: absolute;
  top: 64px;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
  display: grid;
  gap: 8px;
  padding: 16px;
  border-radius: 16px;
  background: #fff7e6;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  opacity: 0;
  pointer-events: none;
  transition: opacity 300ms ease-out;
}

.cp__panel--open {
  opacity: 1;
  pointer-events: auto;
}

.cp__panelTitle {
  margin: 0 0 4px;
  font-size: 11px;
  font-weight: 700;
  color: #0a4fe8;
}

.cp__item {
  border: 0;
  border-radius: 8px;
  background: #6ec8ff;
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 600;
  color: #17141a;
  text-align: left;
  cursor: pointer;
  will-change: transform, opacity;
}

.cp__item:hover,
.cp__item:focus-visible {
  background: #5b8cf8;
  outline: none;
}

.cp__status {
  margin: 0;
  font-size: 11px;
  color: #17141a;
  font-weight: 600;
}

@media (max-width: 340px) {
  .cp__scene {
    width: 200px;
    height: 100px;
  }
  .cp__btn {
    padding: 12px;
  }
  .cp__panel {
    top: 42px;
    width: 180px;
    padding: 8px;
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    justify-content: center;
  }
  .cp__panelTitle {
    display: none;
  }
  .cp__item {
    font-size: 10px;
    padding: 4px 8px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .cp__panel,
  .cp__item {
    transition: none;
  }
}

(function () {
  "use strict";

  var LONGPRESS_MS = 420;
  var POPOVER_STAGGER_MS = 45;
  var POPOVER_ITEM_MS = 210;
  var CYCLE_S = 2;

  var root = document.getElementById("cp");
  var btn = document.getElementById("cpBtn");
  var panel = document.getElementById("cpPanel");
  var items = Array.prototype.slice.call(panel.querySelectorAll(".cp__item"));
  var status = document.getElementById("cpStatus");
  var reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;

  var open = false;
  var pressStart = null;
  var pressing = false;

  function setOpen(v, now) {
    open = v;
    btn.setAttribute("aria-expanded", String(v));
    panel.classList.toggle("cp__panel--open", v);
    if (v) { openStart = now; }
    else { openStart = null; }
  }

  var openStart = null;

  // 값 하나: 목록 항목 인덱스 × POPOVER_STAGGER_MS = 그 항목이 열리기 시작하는 지연.
  function renderPanel(now) {
    if (openStart === null && !open) {
      items.forEach(function (el) { el.style.opacity = "0"; el.style.transform = "translateY(6px)"; });
      return;
    }
    var elapsed = openStart === null ? POPOVER_ITEM_MS * 3 : now - openStart;
    items.forEach(function (el, i) {
      var delay = i * POPOVER_STAGGER_MS;
      var raw = (elapsed - delay) / POPOVER_ITEM_MS;
      var p = Math.max(0, Math.min(1, reduce ? 1 : raw));
      var eased = 1 - Math.pow(1 - p, 3);
      el.style.opacity = eased.toFixed(3);
      el.style.transform = "translateY(" + ((1 - eased) * 6).toFixed(2) + "px)";
    });
  }

  function selectCollection(name) {
    status.textContent = "Saved";
    btn.setAttribute("aria-pressed", "true");
    root.classList.add("cp__scene--picked");
    setOpen(false);
  }

  function focusItem(i) {
    var idx = ((i % items.length) + items.length) % items.length;
    items[idx].focus({ preventScroll: true });
  }

  items.forEach(function (el, i) {
    el.addEventListener("click", function () {
      root.classList.remove("is-demo");
      selectCollection(el.getAttribute("data-name"));
      btn.focus({ preventScroll: true });
    });
    el.addEventListener("keydown", function (e) {
      if (e.key === "ArrowDown") { e.preventDefault(); focusItem(i + 1); }
      else if (e.key === "ArrowUp") { e.preventDefault(); focusItem(i - 1); }
      else if (e.key === "Escape") {
        e.preventDefault();
        root.classList.remove("is-demo");
        setOpen(false);
        btn.focus({ preventScroll: true });
      }
    });
  });

  function shortSave() {
    var v = btn.getAttribute("aria-pressed") !== "true";
    btn.setAttribute("aria-pressed", String(v));
    status.textContent = v ? "Saved" : "Not saved";
  }

  btn.addEventListener("pointerdown", function () {
    root.classList.remove("is-demo");
    pressing = true;
    pressStart = null;
  });
  btn.addEventListener("pointerup", function () {
    // longpress 임계(LONGPRESS_MS)를 못 넘기고 뗀 경우에만 짧은 저장 토글로 처리한다
    if (pressing && !open) { shortSave(); }
    pressing = false;
    pressStart = null;
  });
  btn.addEventListener("pointerleave", function () { pressing = false; pressStart = null; });
  btn.addEventListener("keydown", function (e) {
    // 롱프레스(포인터 전용) 대안: Shift+Enter 또는 ArrowDown 으로 팝오버를 열고 첫 항목으로 이동
    if (e.key === "ArrowDown" || (e.key === "Enter" && e.shiftKey)) {
      e.preventDefault();
      root.classList.remove("is-demo");
      if (!open) { setOpen(true, performance.now()); }
      focusItem(0);
    } else if (e.key === "Escape" && open) {
      e.preventDefault();
      root.classList.remove("is-demo");
      setOpen(false);
    }
  });
  btn.addEventListener("click", function (e) {
    // pointerdown/up longpress 경로와 중복되지 않도록: longpress 로 이미 열렸으면 click 무시
    if (open) { e.preventDefault(); return; }
    // 키보드(Enter/Space) 로 발생한 click 은 pointerup 경로를 거치지 않으므로 여기서 저장 토글
    if (e.detail === 0) { root.classList.remove("is-demo"); shortSave(); }
  });

  var start = null;
  var prevT = 0;
  var cycleOpened = false;
  var cyclePicked = false;
  function loop(now) {
    if (start === null) start = now;
    if (pressing && pressStart === null) { pressStart = now; }
    if (pressing && pressStart !== null && !open && (now - pressStart) > LONGPRESS_MS) {
      setOpen(true, now);
    }
    var t = ((now - start) / 1000) % CYCLE_S;
    if (t < prevT) { cycleOpened = false; cyclePicked = false; }
    prevT = t;
    if (!reduce && root.classList.contains("is-demo")) {
      if (!cycleOpened && t > 0.15) { cycleOpened = true; setOpen(true, now); }
      if (!cyclePicked && t > 1.0) { cyclePicked = true; selectCollection("Reading List"); }
    }
    renderPanel(now);
    requestAnimationFrame(loop);
  }

  requestAnimationFrame(loop);
})();

// CollectionPickerPopoverBookmark — vanilla 판(run/416/demo/08-bookmark-btn-collection-picker-popover/index.html) 의 React 포트.
// 값 하나: 팝오버가 열린 뒤 경과 시간 → 항목 인덱스 × POPOVER_STAGGER_MS 지연을 지나면 그 항목이 뜬다.
import { useEffect, useRef, useState } from "react";
import styles from "./CollectionPickerPopoverBookmark.module.scss";

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

const LONGPRESS_MS = 420;
const POPOVER_STAGGER_MS = 45;
const POPOVER_ITEM_MS = 210;
const CYCLE_S = 2;

const NAMES = ["읽기 목록", "나중에 볼 글", "요리 레시피"];

export default function CollectionPickerPopoverBookmark() {
  const btnRef = useRef<HTMLButtonElement | null>(null);
  const panelRef = useRef<HTMLDivElement | null>(null);
  const itemRefs = useRef<Array<HTMLButtonElement | null>>([null, null, null]) as Box<Array<HTMLButtonElement | null>>;
  const openStartRef = useRef<number | null>(null);
  const pressStartRef = useRef<number | null>(null);
  const pressingRef = useRef<boolean>(false) as Box<boolean>;
  const frameRef = useRef<number>(0) as Box<number>;
  const [pressed, setPressed] = useState(false);
  const [status, setStatus] = useState("저장 전");
  const [demo, setDemo] = useState(true);
  const [reduce, setReduce] = useState(false);

  function setOpen(v: boolean, now: number): void {
    if (btnRef.current) btnRef.current.setAttribute("aria-expanded", String(v));
    if (panelRef.current) panelRef.current.classList.toggle(styles.panelOpen, v);
    openStartRef.current = v ? now : null;
  }

  function renderPanel(now: number): void {
    const items = itemRefs.current;
    if (openStartRef.current === null) {
      items.forEach((el) => {
        if (!el) return;
        el.style.opacity = "0";
        el.style.transform = "translateY(6px)";
      });
      return;
    }
    const elapsed = now - openStartRef.current;
    items.forEach((el, i) => {
      if (!el) return;
      const delay = i * POPOVER_STAGGER_MS;
      const raw = (elapsed - delay) / POPOVER_ITEM_MS;
      const p = Math.max(0, Math.min(1, reduce ? 1 : raw));
      const eased = 1 - Math.pow(1 - p, 3);
      el.style.opacity = eased.toFixed(3);
      el.style.transform = "translateY(" + ((1 - eased) * 6).toFixed(2) + "px)";
    });
  }

  function selectCollection(now: number): void {
    setStatus("저장됨");
    setPressed(true);
    setOpen(false, now);
  }

  useEffect(() => {
    setReduce(window.matchMedia("(prefers-reduced-motion: reduce)").matches);
  }, []);

  useEffect(() => {
    let start = 0;
    let prevT = 0;
    let cycleOpened = false;
    let cyclePicked = false;
    function loop(now: number): void {
      if (start === 0) start = now;
      if (pressingRef.current && pressStartRef.current === null) { pressStartRef.current = now; }
      if (pressingRef.current && pressStartRef.current !== null && openStartRef.current === null && (now - pressStartRef.current) > LONGPRESS_MS) {
        setOpen(true, now);
      }
      const t = ((now - start) / 1000) % CYCLE_S;
      if (t < prevT) { cycleOpened = false; cyclePicked = false; }
      prevT = t;
      if (!reduce && demo) {
        if (!cycleOpened && t > 0.15) { cycleOpened = true; setOpen(true, now); }
        if (!cyclePicked && t > 1.0) { cyclePicked = true; selectCollection(now); }
      }
      renderPanel(now);
      frameRef.current = requestAnimationFrame(loop);
    }
    frameRef.current = requestAnimationFrame(loop);
    return () => cancelAnimationFrame(frameRef.current);
  }, [reduce, demo]);

  function onItemClick(now: number): void {
    setDemo(false);
    selectCollection(now);
    btnRef.current?.focus({ preventScroll: true });
  }

  function focusItem(i: number): void {
    const items = itemRefs.current;
    const idx = ((i % items.length) + items.length) % items.length;
    items[idx]?.focus({ preventScroll: true });
  }

  function shortSave(): void {
    const v = !pressed;
    setPressed(v);
    setStatus(v ? "저장됨" : "저장 전");
  }

  function onPointerDown(): void {
    setDemo(false);
    pressingRef.current = true;
    pressStartRef.current = null;
  }

  function onPointerUp(): void {
    if (pressingRef.current && openStartRef.current === null) { shortSave(); }
    pressingRef.current = false;
    pressStartRef.current = null;
  }

  function onPointerLeave(): void {
    pressingRef.current = false;
    pressStartRef.current = null;
  }

  function onBtnClick(event: { detail: number; preventDefault: () => void }): void {
    if (openStartRef.current !== null) { event.preventDefault(); return; }
    // 키보드(Enter/Space) 로 발생한 click 은 pointerup 경로를 거치지 않으므로 여기서 저장 토글
    if (event.detail === 0) { setDemo(false); shortSave(); }
  }

  function onBtnKeyDown(event: { key: string; shiftKey: boolean; preventDefault: () => void }): void {
    // 롱프레스(포인터 전용) 대안: Shift+Enter 또는 ArrowDown 으로 팝오버를 열고 첫 항목으로 이동
    if (event.key === "ArrowDown" || (event.key === "Enter" && event.shiftKey)) {
      event.preventDefault();
      setDemo(false);
      if (openStartRef.current === null) { setOpen(true, performance.now()); }
      focusItem(0);
    } else if (event.key === "Escape" && openStartRef.current !== null) {
      event.preventDefault();
      setDemo(false);
      setOpen(false, performance.now());
    }
  }

  function onItemKeyDown(i: number, event: { key: string; preventDefault: () => void }): void {
    if (event.key === "ArrowDown") { event.preventDefault(); focusItem(i + 1); }
    else if (event.key === "ArrowUp") { event.preventDefault(); focusItem(i - 1); }
    else if (event.key === "Escape") {
      event.preventDefault();
      setDemo(false);
      setOpen(false, performance.now());
      btnRef.current?.focus({ preventScroll: true });
    }
  }

  return (
    <main className={styles.stage}>
      <div className={styles.cp}>
        <p className={styles.caption}>폴더에 저장</p>
        <div className={styles.scene}>
          <button
            className={styles.btn}
            ref={btnRef}
            type="button"
            aria-pressed={pressed}
            aria-expanded={false}
            aria-haspopup="true"
            onPointerDown={onPointerDown}
            onPointerUp={onPointerUp}
            onPointerLeave={onPointerLeave}
            onClick={onBtnClick}
            onKeyDown={onBtnKeyDown}
          >
            <svg className={styles.icon} viewBox="0 0 24 24" width={28} height={28} aria-hidden="true" focusable="false">
              <path className={styles.shape} d="M6.5 3A1.5 1.5 0 0 1 8 1.5h8A1.5 1.5 0 0 1 17.5 3v18.2a.9.9 0 0 1-1.38.76L12 19.1l-4.12 2.86A.9.9 0 0 1 6.5 21.2Z" />
            </svg>
          </button>
          <div className={styles.panel} ref={panelRef} role="menu">
            <p className={styles.panelTitle}>저장할 목록 고르기</p>
            {NAMES.map((name, i) => (
              <button
                key={name}
                className={styles.item}
                type="button"
                role="menuitem"
                ref={(el: HTMLButtonElement | null) => { itemRefs.current[i] = el; }}
                onClick={() => onItemClick(performance.now())}
                onKeyDown={(event: { key: string; preventDefault: () => void }) => onItemKeyDown(i, event)}
              >
                {name}
              </button>
            ))}
          </div>
        </div>
        <p className={styles.status} aria-live="polite">{status}</p>
      </div>
    </main>
  );
}