/* 346-4 되돌리기 한 줄 헬퍼 — 진짜 `_Profile_History`(페이지 사진첩) · `_RouteEdit_History`(편집기 단추) ·
 * `_RouteEdit_Draft`(다리 감싸기)를 트랜스파일해 가짜 창 · 세션에서 돌림. 다리 = 세션 칸 route-draft 를
 * 바로 쓰는 흉내(`design_pipeline_page` 와 같은 때). 결과 JSON 한 벌(표준출력).
 */
const fs = require("fs");
const path = require("path");
const ts = require(path.join(__dirname, "..", "..", "config", "node_modules", "typescript"));

const ROOT = path.join(__dirname, "..", "..");
const data = new Map();
globalThis.sessionStorage = {
  get length() {
    return data.size;
  },
  key: (i) => [...data.keys()][i] ?? null,
  getItem: (k) => (data.has(k) ? data.get(k) : null),
  setItem: (k, v) => data.set(k, String(v)),
  removeItem: (k) => data.delete(k),
};
const win = new EventTarget();
win.setTimeout = setTimeout;
win.clearTimeout = clearTimeout;
globalThis.window = win;

const cache = new Map();
function loadTs(file) {
  const full = path.resolve(file);
  if (cache.has(full)) return cache.get(full);
  const js = ts.transpileModule(fs.readFileSync(full, "utf8"), {
    compilerOptions: { module: ts.ModuleKind.CommonJS, target: ts.ScriptTarget.ES2020 },
  }).outputText;
  const box = { exports: {} };
  cache.set(full, box.exports);
  const localRequire = (request) =>
    request.startsWith(".")
      ? loadTs(`${path.resolve(path.dirname(full), request)}.ts`)
      : require(request);
  new Function("exports", "module", "require", js)(box.exports, box, localRequire);
  return box.exports;
}
const page = path.join(ROOT, "B05_Profile");
const album = loadTs(path.join(page, "B05_Profile_UI_Profile_History.ts"));
const edit = loadTs(path.join(page, "B05_Profile_UI_RouteEdit_History.ts"));
const draftLink = loadTs(path.join(page, "B05_Profile_UI_RouteEdit_Draft.ts"));

const P = "p1";
const ROUTE = `aislo:draft:route-draft:${P}`;
const GRADE = `aislo:draft:alignment-draft:${P}:7`;
const CROSS = `aislo:draft:crossdesign:${P}:7`;
const SELECT = `aislo:draft:selection:${P}`;
const tick = (ms = 5) => new Promise((resolve) => setTimeout(resolve, ms));
const snap = (nodes, lock = false) => ({
  planned: nodes,
  curveOn: nodes.map(() => true),
  curveRadius: nodes.map(() => null),
  curveLock: nodes.map(() => null),
  curveArc: nodes.map(() => null),
  apexLock: nodes.map((_, i) => lock && i === 1),
  picked: 1,
  rec: lock ? "tag-moved" : "tag-open",
});

(async () => {
  const out = {};
  let profileReads = 0;
  const pageAlbum = album.createProfileHistory(() => (profileReads += 1));
  const opened = snap([
    [0, 0],
    [50, 0],
    [100, 0],
  ]);
  const raw = edit.createRouteEditHistory(opened);
  const bridge = {
    saved: () => JSON.parse(sessionStorage.getItem(ROUTE) ?? "null"),
    edited: (draft) =>
      draft
        ? sessionStorage.setItem(ROUTE, JSON.stringify({ ...draft, rev: 1, terrain: null }))
        : sessionStorage.removeItem(ROUTE),
  };
  const history = draftLink.watch(raw, bridge, () => false);
  const clicks = {};
  const button = (act) => ({
    disabled: false,
    addEventListener: (_type, fn) => (clicks[act] = fn),
  });
  const buttons = { '[data-act="undo"]': button("undo"), '[data-act="redo"]': button("redo") };
  const editor = []; // 편집기에 되살린 걸음(가운데 노드 x · 고정 · 꼬리표 · 글)
  const controls = edit.bindHistoryControls({
    overlay: { querySelector: (sel) => buttons[sel] },
    getHistory: () => history,
    restore: (s, message) => editor.push([s.planned[1][0], s.apexLock[1], s.rec, message]),
  });
  const state = () => ({
    route: bridge.saved()?.nodes?.[1]?.[0] ?? null,
    grade: sessionStorage.getItem(GRADE),
    cross: sessionStorage.getItem(CROSS),
    undo: !buttons['[data-act="undo"]'].disabled,
    redo: !buttons['[data-act="redo"]'].disabled,
  });
  controls.sync();
  out.start = state();

  // ① 평면 점 옮김 — 끄는 동안 두 번 쌓아도 놓을 때 한 걸음
  win.dispatchEvent(new Event("pointerdown"));
  history.commit(
    snap([
      [0, 0],
      [60, 5],
      [100, 0],
    ]),
  );
  history.commit(
    snap(
      [
        [0, 0],
        [70, 5],
        [100, 0],
      ],
      true,
    ),
  );
  out.heldUndo = pageAlbum.canUndo();
  win.dispatchEvent(new Event("pointerup"));
  await tick();
  // ② 계획고 ▲ — 종단도가 쌓음
  sessionStorage.setItem(GRADE, '{"station_offsets":{"20.000":0.1}}');
  pageAlbum.record();
  // 고름만 바뀜 — 사진 밖이라 걸음 안 늘어남
  sessionStorage.setItem(SELECT, '{"chainageM":40}');
  pageAlbum.record();
  // ③ 횡단 카드 고침 — 쌓는 줄 없음 · 칸 바꿈(change) 뒤 기다려 한 걸음
  sessionStorage.setItem(CROSS, '{"20.000":{"ground_type":"soil"}}');
  win.dispatchEvent(new Event("change"));
  await tick(450);
  out.afterEdits = state();

  // Ctrl+Z 세 번 — 거꾸로(종단도 단축키 = 사진첩 undo) · 셋째는 편집기 [되돌리기] 단추
  pageAlbum.undo();
  out.undo1 = state();
  pageAlbum.undo();
  out.undo2 = state();
  out.editorBeforeRouteUndo = editor.length;
  clicks.undo();
  out.undo3 = state();
  out.editorAfterUndo = [...editor];
  // 다시하기 세 번 — 첫째는 편집기 [다시하기] · 나머지는 Ctrl+Y
  clicks.redo();
  out.redo1 = state();
  pageAlbum.redo();
  pageAlbum.redo();
  out.redo3 = state();
  out.editorAfterRedo = editor.slice(out.editorAfterUndo.length);
  out.profileReads = profileReads;
  controls.dispose();
  process.stdout.write(JSON.stringify(out));
})();