/* 298-3 옛 페이지 풀림 단위검증 헬퍼 — `ui_template_window_watch` · `ui_template_overlay_drag` ·
 * `design_leave` 를 그 자리에서 트랜스파일 · 페이지를 다섯 번 다시 세운 뒤 창 듣개 수 · 옛 노드 풀림.
 * `node --expose-gc` 로 부름 · 결과 JSON 을 stdout 으로.
 */
const path = require("path");
const ts = require(path.join(__dirname, "..", "..", "config", "node_modules", "typescript"));
const { makeLoader, memoryStorage } = require("./helper_ts_stub_loader.cjs");

const ROOT = path.join(__dirname, "..", "..");

const storage = memoryStorage();
const win = new EventTarget();
const doc = new EventTarget();
const counts = { window: 0, document: 0 };
for (const [name, target] of [
  ["window", win],
  ["document", doc],
]) {
  const add = target.addEventListener.bind(target);
  target.addEventListener = (...args) => {
    counts[name] += 1;
    return add(...args);
  };
}
Object.assign(win, {
  sessionStorage: storage,
  localStorage: storage,
  setTimeout,
  innerWidth: 1500,
  innerHeight: 900,
});
globalThis.window = win;
globalThis.document = doc;
globalThis.sessionStorage = storage;
globalThis.localStorage = storage;
globalThis.requestAnimationFrame = (fn) => (fn(), 1);

let guard = null;
const STUBS = {
  "@config/config_frontend": {
    ROUTES: { B05_PROFILE: "/b05-profile", B06_SECTION: "/b06-section" },
  },
  "@ui/ui_template_locale": { t: (key) => key },
  "@ui/ui_template_leave_dialog": { leaveOrStay: async () => "stay" },
  "../router": { currentRoute: () => "/b05-profile", setLeaveGuard: (fn) => (guard = fn) },
};

const { loadTs } = makeLoader({
  root: ROOT,
  target: ts.ScriptTarget.ES2022,
  requireFor: (full) => (request) => {
    if (request in STUBS) return STUBS[request];
    if (request.startsWith("@ui/"))
      return loadTs(path.join(ROOT, "ui_template", `${request.slice(4)}.ts`));
    if (request.startsWith(".")) return loadTs(path.join(path.dirname(full), `${request}.ts`));
    return require(request);
  },
});

const drag = loadTs(path.join(ROOT, "ui_template", "ui_template_overlay_drag.ts"));
const leave = loadTs(path.join(ROOT, "A00_Common", "design", "design_leave.ts"));

let settles = 0;
function fakeElement() {
  const node = new EventTarget();
  node.style = {};
  node.isConnected = true;
  node.offsetWidth = 300;
  node.offsetHeight = 40;
  node.classList = {
    contains: () => false,
    add() {},
    toggle() {},
    remove: () => (settles += 1), // detach 가 부름 = 자리 다시 앉힘
  };
  node.querySelector = () => null;
  node.getBoundingClientRect = () => ({ left: 10, top: 80 });
  return node;
}

/** 페이지 한 벌 — 떠남 확인 + 진행단계 패널 · 옛 페이지 노드의 약한 손잡이를 돌려줌. */
function mountPage() {
  const page = fakeElement();
  const panel = fakeElement();
  page.panel = panel; // 페이지 나무 = 패널을 품음
  leave.guardDesignLeave("p1", page, async () => {});
  page.dragHandle = drag.makePanelDraggable(panel, fakeElement(), "pos");
  return { page: new WeakRef(page), panel: new WeakRef(panel), keep: page };
}

(async () => {
  const out = {};
  let live = mountPage();
  out.afterFirst = { ...counts };
  const old = [];
  for (let index = 0; index < 4; index += 1) {
    live.keep.isConnected = false; // 다시 세움 — 옛 페이지는 화면에서 빠지고 버려짐
    old.push({ page: live.page, panel: live.panel });
    live = mountPage();
  }
  out.afterFive = { ...counts };
  await new Promise((resolve) => setTimeout(resolve, 0));
  globalThis.gc();
  await new Promise((resolve) => setTimeout(resolve, 0));
  globalThis.gc();
  out.oldAlive = old.filter((pair) => pair.page.deref() || pair.panel.deref()).length;
  out.liveAlive = Boolean(live.page.deref() && live.panel.deref());
  // 살아 있는 패널은 창 크기 바뀜을 여전히 들음 · 버려진 패널은 안 부름
  settles = 0;
  win.dispatchEvent(new Event("resize"));
  out.resizeSettles = settles;
  // 떠남 확인 — 살아 있는 페이지만(고침 없음 = 안 막음)
  const event = new Event("beforeunload", { cancelable: true });
  win.dispatchEvent(event);
  out.unloadBlocked = event.defaultPrevented;
  out.guardSet = typeof guard === "function";
  process.stdout.write(JSON.stringify(out));
})();