/* =============================================================================
 * formula_doc_screen.ts
 * 단가산출 기초 수식 문서 화면(PLAN 802-3 · 요구 660~665 · 요구서_664 3 장) — 공용(M01 · 뒤에 M02 = 길 앞머리만 바꿈)
 *   위 = 옵션 가로(선택 · 입력 기호 · 바꾸면 바로 다시 그림 · 문서는 안 바뀜) · 결과/계 · [수식 저장] · [고침 버림](관리자)
 *   가운데 = 격자 두 칸 — 왼쪽 기호 식 · 오른쪽 값 식(`formula_doc_lines.ts`) · 오른쪽 아래 기호 정의(`formula_doc_defs.ts`)
 *   빈 문서에서 시작 — [+ 식 줄] 에 `Q = 3600 × q × K × f × E / Cm` 침 → 새 기호마다 「정의 필요」 → 연결 고름
 *   셈 = 브라우저 계산기(`calcDoc`) 즉시 · 연결 값은 서버 기록 캐시(`common_util_formula_doc_cache.ts`)
 *        · 캐시에 없는 연결만 뒤에서 `POST {길}/preview`(옛 요청 끊음) → 캐시에 더해 다시 셈
 *   고침 = 캐시(sessionStorage `opt.cache`)에 쌓고 [수식 저장] 한 번에 `POST {길}/save`(서버가 정본으로 다시 셈 · 파일에 씀)
 *   무엇을 지워도 오류 없음 — 표지(정의 필요 · 순환 · 0 나눔 …) + 금액 「—」
 *   M02 사본(`opt.copy` · 802-4b-2) — 길 앞머리 = SK 마다(`/m02/layers/{층}/sangeun/{키}/doc`) · 옵션 = 문서 값(SK 고른 값 · 저장) ·
 *     [단가 갱신] · [재생성] · 「M01 새 판 있음」(`formula_doc_copy.ts`) · 단가산출 연결 끊기 · 다시 잇기(`formula_doc_sub.ts`) ·
 *     저장 몸 {문서, 끊음, 판} · `admin` = 층 쓰기 권한(없으면 읽기만 · 옵션도 잠금)
 * ========================================================================== */

import { API_BASE_URL } from "@config/config_frontend";
import { createBadge } from "@ui/ui_template_badge";
import { createButton } from "@ui/ui_template_button";
import { eqText } from "@ui/ui_template_equation";
import { editNumber } from "@ui/ui_template_equation_edit";
import {
  el,
  hideLoadingOverlay,
  showConfirmDialog,
  showLoadingOverlay,
  showToast,
} from "@ui/ui_template_elements";
import { createInputField } from "@ui/ui_template_input";
import {
  DocError,
  rename,
  varId,
  type FormulaDoc,
  type Link,
  type MoneyLine,
} from "../common_util/common_util_formula_doc";
import { calcDoc, type DocAnswer } from "../common_util/common_util_formula_doc_calc";
import { createDocCache, type DocRecord } from "../common_util/common_util_formula_doc_cache";
import type { DocTable } from "../common_util/common_util_formula_doc_table";
import {
  askJob,
  copyBadges,
  copyTools,
  type CopyJob,
  type CopyMark,
  type CopyOptions,
  type JobReply,
} from "./formula_doc_copy";
import { buildDefs, type Pick } from "./formula_doc_defs";
import { editLine, editLit, editMoney, ensureVar, splitLine, tidyText } from "./formula_doc_edit";
import { buildLines, type EditAt } from "./formula_doc_lines";
import { buildOptions } from "./formula_doc_options";
import { reach } from "./formula_doc_render";
import { subBlock } from "./formula_doc_sub";
import { ft } from "./formula_doc_text";

export { splitLine };
import "./formula_doc.css";

export interface DocScreenOptions {
  /** 길 앞머리(`/m01/logic/doc`) — GET ?key · POST /preview · /save · /links · GET /table */
  base: string;
  admin: boolean;
  /** sessionStorage 열쇠 */
  cache: string;
  /** M02 사본(SK) — 길 앞머리 · 판 · 끊음 · 할일 */
  copy?: CopyOptions;
}

type Docs = Record<string, FormulaDoc>;

interface Loaded {
  문서: FormulaDoc;
  셈: DocAnswer;
  연결: DocRecord;
  새?: boolean;
  부름?: Docs;
  끊음?: Docs;
  사본?: CopyMark;
  판?: string;
}

const clone = <T>(v: T): T => JSON.parse(JSON.stringify(v)) as T;

export function createDocScreen(opt: DocScreenOptions) {
  const head = el("div", { className: "fdoc__head" });
  const marks = el("div", { className: "fdoc__marks" });
  const grid = el("div", { className: "fdoc__grid" });
  const root = el("div", {
    className: "fdoc ui-eq",
    attrs: { "data-formula-doc": "" },
    children: [head, marks, grid],
  });
  let key = "";
  let saved = "";
  let fresh = false;
  let doc: FormulaDoc | null = null;
  let answer: DocAnswer | null = null;
  let cache = createDocCache();
  let given: Record<string, unknown> = {};
  let openDef: string | null = null;
  let auto: EditAt = null;
  let showOff = false; // 선택으로 꺼진 금액 줄(고침 모드)
  let seq = 0;
  let asked = "";
  let ctl: AbortController | null = null;
  let waiting = false;
  const tables = new Map<string, Promise<DocTable | null>>();
  const cp = opt.copy;
  let cut: Docs = {}; // 사본 — 끊은 단가산출 문서(이 사본 안 · 고칠 수 있음)
  let savedCut = "{}";
  let calls: Docs = {}; // 사본 — 부름 문서(다시 잇기 = 이 문서로)
  let mark: CopyMark | undefined;
  let version = "";

  const call = async <T>(path: string, body?: unknown, signal?: AbortSignal): Promise<T> => {
    const r = await fetch(`${API_BASE_URL}${cp ? cp.route(key, path) : opt.base + path}`, {
      method: body === undefined ? "GET" : "POST",
      credentials: "include",
      headers: { "Content-Type": "application/json" },
      ...(body === undefined ? {} : { body: JSON.stringify(body) }),
      signal,
    });
    const data = (await r.json().catch(() => ({}))) as T & { detail?: unknown };
    if (!r.ok) {
      const why = data.detail;
      throw Object.assign(new Error(typeof why === "string" ? why : r.statusText), {
        status: r.status,
      });
    }
    return data;
  };

  // ── 캐시(sessionStorage) ──
  const drafts = (): Record<string, FormulaDoc> => {
    try {
      return JSON.parse(sessionStorage.getItem(opt.cache) ?? "{}") as Record<string, FormulaDoc>;
    } catch {
      return {};
    }
  };
  const dirty = (): boolean =>
    !!doc && (JSON.stringify(doc) !== saved || JSON.stringify(cut) !== savedCut);
  const cutKey = (): string => `${key}#끊음`;
  const keep = (): void => {
    const all = drafts();
    if (dirty()) all[key] = doc!;
    else delete all[key];
    if (cp && dirty()) all[cutKey()] = cut as unknown as FormulaDoc;
    else delete all[cutKey()];
    try {
      sessionStorage.setItem(opt.cache, JSON.stringify(all));
    } catch {
      /* 캐시가 막혀도 화면 안 고침은 남음 */
    }
  };

  // ── 셈 ──
  const usable = (): Record<string, unknown> => {
    const out: Record<string, unknown> = {};
    for (const v of doc?.변수 ?? []) {
      const k = v.열쇠;
      if (!k || !(k in given)) continue;
      const kind = v.연결?.갈래;
      if (kind === "입력") out[k] = given[k];
      if (kind === "선택" && (v.연결?.목록 ?? []).some((x) => String(x) === String(given[k])))
        out[k] = (v.연결!.목록 ?? []).find((x) => String(x) === String(given[k]));
    }
    return out;
  };
  const recalc = (): void => {
    if (!doc) return;
    answer = calcDoc(doc, cache.links, usable());
    if (cache.takeMissing()) ask();
  };
  /** 캐시에 없는 연결 — 뒤에서 서버 기록을 받아 더함(같은 문서 · 입력은 한 번만) */
  const ask = (): void => {
    const snap = JSON.stringify([doc, usable()]);
    if (snap === asked) return;
    asked = snap;
    ctl?.abort();
    ctl = new AbortController();
    const mine = ++seq;
    waiting = true;
    void call<{ 셈: DocAnswer; 연결: DocRecord; 부름?: Docs }>(
      "/preview",
      cp ? { 문서: doc, 끊음: cut } : { 문서: doc, 입력: usable() },
      ctl.signal,
    )
      .then((got) => {
        if (mine !== seq) return;
        cache.merge(got.연결);
        calls = { ...calls, ...(got.부름 ?? {}) };
        cache.merge({ 문서: cut });
        waiting = false;
        recalc();
        draw();
      })
      .catch(() => {
        if (mine === seq) waiting = false;
      });
  };

  const change = (fn: (d: FormulaDoc) => void): void => {
    if (!doc) return;
    fn(doc);
    keep();
    recalc();
    draw();
  };

  // ── 고침(`formula_doc_edit.ts`) ──
  const onMoney = (i: number, patch: Partial<MoneyLine> | null): void =>
    change((d) => {
      editMoney(d, i, patch);
      if (patch && "이름" in patch && !d.금액?.[i]?.단가) auto = { kind: "price", i };
    });

  const onPickVar = (id: string, num?: HTMLElement): void => {
    const v = doc?.변수?.find((x) => varId(x) === id);
    if (opt.admin && num && v?.연결?.갈래 === "숫자") {
      editNumber(num, (t) => {
        const n = Number(t.replace(/,/g, ""));
        change((d) => (ensureVar(d, id).연결 = { ...v.연결, 값: Number.isFinite(n) ? n : t }));
      });
      return;
    }
    openDef = id;
    draw();
    grid.querySelector(`[data-def="${CSS.escape(id)}"]`)?.scrollIntoView({ block: "nearest" });
  };

  const tableOf = (k: string): Promise<DocTable | null> => {
    if (!tables.has(k))
      tables.set(
        k,
        call<DocTable & { 끊김?: string }>(`/table?key=${encodeURIComponent(k)}`)
          .then((t) => {
            if (t.끊김) return null;
            cache.putTable(k, t);
            return t;
          })
          .catch(() => null),
      );
    return tables.get(k)!;
  };

  const subDoc = (k: string): FormulaDoc | null => {
    try {
      return cache.links.doc(k) ?? null;
    } catch {
      cache.takeMissing();
      return null;
    }
  };

  // ── 사본 — 단가산출 연결 끊기 · 다시 잇기 · 끊은 문서 고침 ──
  const changeCut = (k: string, fn: (d: FormulaDoc) => void): void => {
    if (!cut[k]) return;
    fn(cut[k]);
    cache.merge({ 문서: { [k]: cut[k] } });
    keep();
    recalc();
    draw();
  };
  const onCut = (k: string): void => {
    const from = subDoc(k);
    if (!from) return;
    cut = { ...cut, [k]: clone(from) };
    changeCut(k, () => undefined);
  };
  const onJoin = async (k: string): Promise<void> => {
    if (!(await showConfirmDialog(ft("Ask_Relink"), ft("Relink")))) return;
    const { [k]: _gone, ...rest } = cut;
    cut = rest;
    if (calls[k]) cache.merge({ 문서: { [k]: calls[k] } });
    else asked = ""; // 부름 문서를 아직 모름 — 뒤에서 서버에 물음
    keep();
    recalc();
    draw();
  };
  const sub = (id: string): HTMLElement | null =>
    subBlock(id, {
      doc,
      answer,
      cache,
      ...(cp
        ? {
            copy: {
              edit: opt.admin,
              has: (k: string) => k in calls || k in cut,
              cut: (k: string) => cut[k],
              onCut,
              onJoin: (k: string) => void onJoin(k),
              change: changeCut,
            },
          }
        : {}),
    });

  // ── 그림 ──
  /** 옵션 가로 — M01 = 화면 값만(`given`) · 사본 = 문서 값(SK 고른 값 · 저장) */
  const optionBar = (): HTMLElement[] =>
    buildOptions(doc, given, !!cp && !opt.admin, (k, v, x) => {
      const at = doc?.변수?.indexOf(v) ?? -1; // 옵션 열쇠 ≠ 기호 — 그 정의 자리에 값
      if (cp) return change((d) => at >= 0 && (d.변수![at].연결 = { ...v.연결!, 값: x }));
      given[k] = x;
      recalc();
      draw();
    });

  const headLine = (): HTMLElement => {
    const a = answer;
    const bits: (HTMLElement | string)[] = [];
    if (doc?.결과) {
      const r = a?.결과;
      bits.push(
        el("strong", { text: ft("Result") }),
        el("span", {
          className: "fdoc__headval",
          attrs: { "data-total": "" },
          text: typeof r === "number" ? `${eqText(r)} ${doc.결과단위 ?? ""}` : "—",
        }),
      );
    } else {
      const total = a?.계;
      bits.push(
        el("strong", { text: a?.머리 === "합계" ? ft("Total") : ft("Sum") }),
        el("span", {
          className: "fdoc__headval",
          attrs: { "data-total": "" },
          text: typeof total === "number" ? `${eqText(total)} ${doc?.결과단위 ?? ""}` : "—",
        }),
      );
    }
    if (opt.admin && doc && !(doc.금액 ?? []).length) {
      const f = createInputField({
        placeholder: ft("Result_Sym"),
        value: doc.결과 ?? "",
        compact: true,
        size: 24,
      });
      f.input.addEventListener("change", () =>
        change((d) => {
          const t = f.input.value.trim();
          if (t) d.결과 = t;
          else delete d.결과;
        }),
      );
      f.root.classList.add("fdoc__resultsym");
      bits.push(f.root);
    }
    if (waiting)
      bits.push(el("span", { className: "ui-text ui-text--muted", text: ft("Loading") }));
    if (fresh && !dirty())
      bits.push(el("span", { className: "ui-text ui-text--muted", text: ft("Fresh") }));
    if (dirty()) bits.push(createBadge(ft("Dirty"), "warning"));
    if (cp) bits.push(...copyBadges(mark, opt.admin));
    const tools = opt.admin
      ? [
          ...(cp ? copyTools(true, (job) => void runJob(job)) : []),
          createButton({
            label: ft("Discard"),
            variant: "ghost",
            size: 28,
            disabled: !dirty(),
            onClick: () => void discard(),
          }),
          createButton({
            label: ft("Save"),
            variant: "filled",
            size: 28,
            disabled: !dirty(),
            onClick: () => void save(),
          }),
        ]
      : [];
    return el("div", {
      className: "fdoc__sum",
      children: [
        el("div", { className: "fdoc__sumleft", children: bits }),
        el("div", { className: "fdoc__tools", children: tools }),
      ],
    });
  };

  const markBox = (): void => {
    const list = answer?.표지 ?? [];
    marks.replaceChildren();
    if (!list.length) return;
    const count = new Map<string, number>();
    for (const m of list) count.set(m.갈래, (count.get(m.갈래) ?? 0) + 1);
    marks.append(
      ...[...count].map(([k, n]) =>
        createBadge(`${k} ${n}`, k === "빈 문서" ? "neutral" : "warning"),
      ),
      ...list
        .slice(0, 4)
        .map((m) => el("span", { className: "ui-text ui-text--muted fdoc__marktext", text: m.글 })),
    );
  };

  const draw = (): void => {
    if (!doc || !answer) {
      head.replaceChildren();
      marks.replaceChildren();
      grid.replaceChildren();
      return;
    }
    const vals = answer.값 ?? {};
    const vars = new Map((doc.변수 ?? []).map((v) => [varId(v), v]));
    const lineSet = new Set((doc.식 ?? []).map((l) => String(l.기호 ?? "")).filter(Boolean));
    const shown = reach(doc, vals, showOff);
    const markMap = new Map<string, string>();
    for (const m of answer.표지 ?? []) {
      const at = m.기호 || (m as { 자리?: string }).자리;
      if (at && !markMap.has(at)) markMap.set(at, m.글);
    }
    const options = optionBar();
    head.replaceChildren(
      ...(options.length ? [el("div", { className: "fdoc__options", children: options })] : []),
      headLine(),
      ...(opt.admin
        ? [el("p", { className: "ui-text ui-text--muted fdoc__hint", text: ft("Hint") })]
        : []),
    );
    markBox();
    const lines = buildLines({
      admin: opt.admin,
      showOff,
      onShowOff: () => {
        showOff = !showOff;
        draw();
      },
      doc,
      answer,
      vars,
      marks: markMap,
      auto,
      onLine: (i, t) => change((d) => editLine(d, i, t)),
      onExpr: (i, t) => change((d) => (d.식![i].식 = tidyText(t))),
      onMoney,
      onLit: (w, i, at, v) => change((d) => editLit(d, w, i, at, v)),
      onPickVar,
      onAddLine: () => {
        auto = { kind: "line", i: (doc!.식 ?? []).length };
        change((d) => (d.식 ??= []).push({ 기호: "", 식: "" }));
      },
      onAddMoney: (g) => {
        auto = { kind: "name", i: (doc!.금액 ?? []).length };
        change((d) =>
          (d.금액 ??= []).push({ 이름: "", 비목: "노무비", 단가: "", ...(g ? { 묶음: g } : {}) }),
        );
      },
      onGroupName: (old, now) =>
        change((d) =>
          (d.금액 ?? []).forEach((l) => {
            if ((l.묶음 ?? "") !== old) return;
            if (now) l.묶음 = now;
            else delete l.묶음;
          }),
        ),
      onRedraw: () => redraw(),
    });
    auto = null;
    const defs = buildDefs({
      admin: opt.admin,
      vars,
      names: cache.names,
      lines: lineSet,
      shown,
      unused: [...vars.keys()].filter((id) => !shown.includes(id)),
      need: new Set(
        shown.filter((id) => !lineSet.has(id) && (vars.get(id)?.연결?.갈래 ?? "식") === "식"),
      ),
      open: openDef,
      onOpen: (id) => {
        openDef = id;
        draw();
      },
      setLink: (id, link: Link) =>
        change((d) => {
          const clean = Object.fromEntries(Object.entries(link).filter(([, x]) => x !== undefined));
          ensureVar(d, id).연결 = clean as Link;
        }),
      setVar: (id, patch) => change((d) => Object.assign(ensureVar(d, id), patch)),
      rename: (id, sign, low, up) => {
        const copy = clone(doc!);
        try {
          rename(copy, id, sign, low, up);
        } catch (e) {
          if (e instanceof DocError) return ft("Bad_Sign");
          throw e;
        }
        openDef = varId({ 기호: sign, 아래: low, 위: up });
        change((d) => Object.assign(d, copy));
        return null;
      },
      dropVar: (id) => {
        openDef = null;
        change((d) => {
          d.변수 = (d.변수 ?? []).filter((v) => varId(v) !== id);
          d.식 = (d.식 ?? []).filter((l) => l.기호 !== id);
        });
      },
      makeLine: (id) => {
        if (lineSet.has(id)) return;
        auto = { kind: "line", i: (doc!.식 ?? []).length };
        change((d) => (d.식 ??= []).push({ 기호: id, 식: "" }));
      },
      ask: (kind, words, group) =>
        call<{ 후보: Pick[]; 더있음: boolean }>("/links", { 갈래: kind, 검색: words, 분류: group }),
      table: tableOf,
      subInputs: (k) =>
        (subDoc(k)?.변수 ?? [])
          .filter((v) => ["선택", "입력", "숫자"].includes(v.연결?.갈래 ?? "") && v.열쇠)
          .map((v) => v.열쇠!),
      sub,
    });
    grid.replaceChildren(
      el("div", { className: "fdoc__colhead", text: ft("Sym_Head") }),
      el("div", { className: "fdoc__colhead", text: ft("Val_Head") }),
      ...lines,
      defs,
    );
  };

  /** 고침 취소 — 빈 새 줄은 걷고 다시 그림 */
  const redraw = (): void => {
    if (!doc) return;
    const before = JSON.stringify(doc);
    doc.식 = (doc.식 ?? []).filter((l) => String(l.기호 ?? "") || String(l.식 ?? ""));
    doc.금액 = (doc.금액 ?? []).filter((l) => l.이름 || l.단가 || l.수량);
    if (JSON.stringify(doc) !== before) {
      keep();
      recalc();
    }
    draw();
  };

  const take = (got: Loaded): void => {
    cache.merge(got.연결);
    saved = JSON.stringify(got.문서);
    doc = clone(got.문서);
    if (!cp) return;
    calls = got.부름 ?? {};
    cut = clone(got.끊음 ?? {});
    savedCut = JSON.stringify(cut);
    mark = got.사본;
    version = got.판 ?? "";
  };

  const body = (): Record<string, unknown> =>
    cp ? { 문서: doc, 끊음: cut, 판: version } : { 문서: doc };

  /** 사본 [단가 갱신] · [재생성] — 미리 셈 → 알림 → 저장(고친 것 먼저 저장 · 버림) */
  const runJob = async (job: CopyJob): Promise<void> => {
    if (!doc || !cp) return;
    if (dirty()) return void showToast(ft("Dirty_First"), "warning");
    showLoadingOverlay();
    let got: JobReply;
    try {
      got = await call<JobReply>("/preview", { 할일: job });
    } catch (e) {
      hideLoadingOverlay();
      return void showToast(
        `${ft("Save_Failed")} — ${e instanceof Error ? e.message : ""}`,
        "error",
      );
    }
    hideLoadingOverlay();
    const names = new Map(Object.entries({ ...calls, ...cut }).map(([k, d]) => [k, d.이름 ?? ""]));
    if (await askJob(job, got, names)) await save({ 할일: job, 판: version }, ft("Job_Done"));
  };

  const save = async (send = body(), done = ft("Saved")): Promise<void> => {
    if (!doc) return;
    showLoadingOverlay();
    try {
      const got = await call<Loaded>("/save", send).catch(async (e: { status?: number }) => {
        // 사본 판 바뀜(페이지 [저장] 등) — 수식 사본이 그대로면 새 판으로 한 번 더
        if (!cp || e.status !== 409) throw e;
        const now = await call<Loaded>("");
        if (
          JSON.stringify([now.문서, now.끊음 ?? {}]) !==
          JSON.stringify([JSON.parse(saved), JSON.parse(savedCut)])
        )
          throw e;
        return call<Loaded>("/save", { ...send, 판: (version = now.판 ?? "") });
      });
      take(got);
      fresh = false;
      keep();
      recalc();
      draw();
      if (cp && got.판) cp.onSaved?.(got.판);
      showToast(done, "success");
    } catch (e) {
      showToast(`${ft("Save_Failed")} — ${e instanceof Error ? e.message : ""}`, "error");
    } finally {
      hideLoadingOverlay();
    }
  };

  const back = (): void => {
    doc = JSON.parse(saved) as FormulaDoc;
    cut = JSON.parse(savedCut) as Docs;
    cache.merge({ 문서: { ...calls, ...cut } });
  };

  const discard = async (): Promise<void> => {
    if (!doc || !dirty()) return;
    back();
    openDef = null;
    keep();
    recalc();
    draw();
  };

  /** 문서 열기 — 같은 키면 그대로(다시 그림만) */
  const open = async (next: string): Promise<void> => {
    if (next === key && doc) return;
    key = next;
    doc = answer = null;
    given = {};
    showOff = false;
    openDef = null;
    asked = "";
    cache = createDocCache();
    tables.clear();
    [cut, calls, mark, savedCut, version] = [{}, {}, undefined, "{}", ""];
    draw();
    if (!next) {
      const why = cp ? ft("No_Key") : ft("Need_Save");
      head.replaceChildren(el("p", { className: "ui-text ui-text--muted", text: why }));
      return;
    }
    const mine = ++seq;
    try {
      const got = await call<Loaded>(cp ? "" : `?key=${encodeURIComponent(next)}`);
      if (mine !== seq || key !== next) return;
      take(got);
      fresh = !!got.새;
      const draft = drafts()[next];
      if (draft) doc = clone(draft);
      const kept = cp ? (drafts()[`${next}#끊음`] as unknown as Docs | undefined) : undefined;
      if (kept) cache.merge({ 문서: (cut = clone(kept)) });
      recalc();
      draw();
    } catch (e) {
      if (mine === seq)
        head.replaceChildren(
          el("p", {
            className: "ui-text ui-text--muted",
            text: `${ft("Load_Failed")} — ${e instanceof Error ? e.message : ""}`,
          }),
        );
    }
  };

  const canLeave = async (): Promise<boolean> => {
    if (!dirty()) return true;
    if (!(await showConfirmDialog(ft("Leave"), ft("Leave_Ok")))) return false;
    back();
    keep();
    return true;
  };

  return {
    root,
    /** 로직 키로 그림(빈 키 = 비움) — 다른 인자는 옛 수식 탭 꼴 호환 */
    draw: (next: string): void => void open(next),
    canLeave,
    /** 시험 · 확인용 — 지금 문서 · 셈 */
    state: () => ({ doc, answer, dirty: dirty() }),
  };
}