/* =============================================================================
 * M02_DF_Entry.ts
 * 단가산출 흐름도(시험) — 들어가는 단추 · 화면 전체를 덮는 시험판 페이지 · 시작 화면 · 고치는 화면 · 잇기
 * 모양은 `docs/raw/M01_쉬운단가/흐름도_정함.md`(1판 약속 = 원가다이어그램_정함.md) · 이 폴더째 지워도 됨
 * (폴더 밖 참조는 M01 LogicLab.ts 두 줄 + 서버 등록 한 줄). DataFlow 의 다른 파일은 import() 로 늦게.
 * 잇기: 열기 → 입력 값(cfValues) → renderDiagram · 「상세 내용」(상자 · 알약 · 선 고름마다 판을 바꿔 끼움 —
 *   M02_DF_Entry_Detail) · renderSummary → 바뀔 때마다 기록(객체 그대로) · evalLogic → 저장(서버 대조) · 지우기 ·
 *   실행 취소 · Ctrl+Z · Ctrl+S. 단추 · 칸은 공용 작은 크기. 바깥 페이지 하나만 세로로 밀림.
 * ========================================================================== */

import { currentLanguageIndex } from "@ui/ui_template_locale";
import {
  createButton,
  createInputField,
  createSelectField,
  createTag,
  el,
  showConfirmDialog,
  showToast,
} from "@ui/ui_template_elements";
import { openModal } from "@ui/ui_template_modal";
import { formatMoney } from "../../M01_MasterData/M01_MasterData_UI_Logic_Money";
import type { CfListItem } from "./M02_DF_Api";
import type { CfBreak, CfEvalOptions, CfEvalResult, CfValues } from "./M02_DF_Eval";
import type { CfKind, CfLogic, CfPort, CfStep } from "./M02_DF_Model";
import type { CfSel } from "./M02_DF_Verify";
import type { DfPillSel } from "./M02_DF_Diagram_Parts";
import {
  detailFrame,
  drawHead,
  drawWarnings,
  fetchValues,
  loadLogics,
  queriesOf,
  unitChoices,
  type DfPick,
} from "./M02_DF_Entry_Detail";
import "./M02_DF_Entry.css";

/** DataFlow 의 다른 파일 — 페이지를 열 때 한 번에 불러옴(엔진이 M01 첫 묶음에 안 들어가게) */
const loadMods = () =>
  Promise.all([
    import("./M02_DF_Model"),
    import("./M02_DF_Eval"),
    import("./M02_DF_Api"),
    import("./M02_DF_Diagram"),
    import("./M02_DF_FuncPanel"),
    import("./M02_DF_OutputPanel"),
    import("./M02_DF_Summary"),
    import("./M02_DF_Sample"),
    import("./M02_DF_InputPanel"),
    import("./M02_DF_PillPanel"),
    import("./M02_DF_LinkPanel"),
    import("./M02_DF_Standards"),
  ]).then(([model, ev, api, diagram, func, output, summary, sample, input, pill, line, std]) => ({
    model,
    ev,
    api,
    diagram,
    func,
    output,
    summary,
    sample,
    input,
    pill,
    line,
    std,
  }));
type Mods = Awaited<ReturnType<typeof loadMods>>;

const TEXT = {
  Open: ["단가산출 흐름도(시험)", "Cost flow (trial)"],
  Title: ["단가산출 흐름도", "Cost flow"],
  Trial: ["시험판 — 임시 폴더에 저장", "Trial — saved in a temporary folder"],
  Close: ["닫기", "Close"],
  Loading: ["불러오는 중", "Loading"],
  OpenFailed: ["열지 못함 — {v}", "Could not open — {v}"],
  Start_New: ["새로 만들기", "New"],
  Start_Mine: ["내 로직", "My logics"],
  Start_MineNone: ["아직 없음", "None yet"],
  Start_Samples: ["견본 — 복사해서 열기", "Samples — open a copy"],
  Name: ["로직 이름", "Logic name"],
  NamePlaceholder: ["예: 메쌓기 내 방식", "e.g. my dry stone wall"],
  Unit: ["결과 단위", "Result unit"],
  Undo: ["실행 취소", "Undo"],
  Save: ["저장", "Save"],
  Delete: ["지우기", "Delete"],
  Unsaved: ["저장 안 함", "Not saved"],
  Diagram: ["다이어그램", "Diagram"],
  Summary: ["원가", "Cost"],
  Color: ["상자 색", "Box colour"],
  BoxName: ["상자 이름", "Box name"],
  NameTaken: ["「{v}」 — 같은 이름의 상자가 있음", "“{v}” — another box has this name"],
  Standards: ["표준 표", "Standards"],
  Logics: ["다른 로직을 못 읽음 — {v}", "Couldn't read other logics — {v}"],
  NoName: ["로직 이름을 넣어 주세요", "Enter a logic name"],
  SaveAnyway: [
    "고칠 곳이 있음 — {v} · 그래도 저장할까요?",
    "There are issues — {v} · Save anyway?",
  ],
  Saving: ["저장 중", "Saving"],
  Saved: ["저장했음", "Saved"],
  SaveFailed: ["저장 못 함 — {v}", "Not saved — {v}"],
  Differs: [
    "저장 때 서버가 다시 셈한 원가 {s} 원 — 화면 값 {c} 원과 다름",
    "Recalculated on save: {s} — differs from the screen value {c}",
  ],
  Delete_Ask: ["「{v}」 을(를) 지울까요? 되살릴 수 없음", "Delete “{v}”? This cannot be undone"],
  Deleted: ["지웠음", "Deleted"],
  Values: ["입력 값을 못 받음 — {v}", "Couldn't get input values — {v}"],
  Leave_Ask: [
    "저장 안 한 것이 있음 — 저장하지 않고 닫을까요?",
    "There are unsaved changes — close without saving?",
  ],
  Leave_Ok: ["저장 안 하고 닫기", "Close without saving"],
} as const;

type TextKey = keyof typeof TEXT;

const te = (key: TextKey, vars: Record<string, string | number> = {}): string =>
  Object.entries(vars).reduce(
    (text, [k, v]) => text.replace(`{${k}}`, String(v)),
    (TEXT[key][currentLanguageIndex as 0 | 1] ?? TEXT[key][0]) as string,
  );

const muted = (text: string): HTMLElement => el("p", { className: "m02-df__muted", text });

/** M01 단가산출 막대의 다른 시험판 단추 옆에 놓는 단추 — 누르면 시험판 페이지 */
export function createDataFlowButton(): HTMLButtonElement {
  return createButton({ label: te("Open"), variant: "filled", size: "sm", onClick: openDataFlow });
}

function openDataFlow(): void {
  /** 고치는 화면이 열려 있을 때만 */
  let paper: { dirty(): boolean; save(): Promise<void>; undo(): void } | null = null;
  let units: string[] | null = null;
  const mods = loadMods();

  const mayLeave = async (): Promise<boolean> =>
    !paper?.dirty() || showConfirmDialog(te("Leave_Ask"), te("Leave_Ok"));

  const body = el("main", { className: "m02-df__body" });
  const strip = el("div", { className: "m02-df__strip" });
  const close = createButton({
    label: te("Close"),
    variant: "ghost",
    size: "sm",
    onClick: () =>
      void (async () => {
        if (await mayLeave()) paper ? void showStart() : shut();
      })(),
  });
  const page = el("div", {
    className: "m02-df",
    attrs: { role: "dialog", "aria-modal": "true", "aria-label": te("Title") },
    children: [
      el("header", {
        className: "m02-df__head",
        children: [
          el("h2", { className: "m02-df__title", text: te("Title") }),
          el("span", { className: "m02-df__trial", text: te("Trial") }),
          strip,
          close,
        ],
      }),
      body,
    ],
  });
  const prevOverflow = document.body.style.overflow;
  const shut = (): void => {
    page.remove();
    document.body.style.overflow = prevOverflow;
  };
  page.addEventListener("keydown", (ev) => {
    if (ev.defaultPrevented) return;
    if (ev.key === "Escape") {
      void (async () => {
        if (await mayLeave()) shut();
      })();
      return;
    }
    if (!paper || !(ev.ctrlKey || ev.metaKey)) return;
    const key = ev.key.toLowerCase();
    if (key === "z" && !ev.shiftKey) {
      ev.preventDefault();
      paper.undo();
    } else if (key === "s") {
      ev.preventDefault();
      void paper.save();
    }
  });

  const run = (job: (M: Mods) => Promise<void>): void => {
    body.replaceChildren(muted(te("Loading")));
    void mods.then(job).catch((e: unknown) => {
      showToast(te("OpenFailed", { v: e instanceof Error ? e.message : String(e) }), "error");
      void showStart();
    });
  };

  /* ---------- 시작 화면 ---------- */

  const listRow = (name: string, unit: string, onClick: () => void, title = ""): HTMLElement => {
    const row = el("button", {
      className: "m02-df__item",
      attrs: { type: "button", title },
      children: [
        el("span", { className: "m02-df__item-name", text: name }),
        el("span", { className: "m02-df__item-unit", text: unit }),
      ],
    });
    row.addEventListener("click", onClick);
    return row;
  };

  const showStart = async (): Promise<void> => {
    paper = null;
    strip.replaceChildren();
    const mineHost = el("div", { className: "m02-df__list", children: [muted(te("Loading"))] });
    const sampleHost = el("div", { className: "m02-df__list" });
    body.replaceChildren(
      el("div", {
        className: "m02-df__start",
        children: [
          el("section", {
            className: "m02-df__start-col",
            children: [
              bigButton(te("Start_New"), () =>
                run(async (M) => showPaper(M, M.model.newLogic("", (await units_())[0]), false)),
              ),
              el("h3", { text: te("Start_Mine") }),
              mineHost,
            ],
          }),
          el("section", {
            className: "m02-df__start-col",
            children: [el("h3", { text: te("Start_Samples") }), sampleHost],
          }),
        ],
      }),
    );
    const M = await mods;
    sampleHost.replaceChildren(
      ...M.sample.sampleList().map((s) =>
        listRow(
          s.name,
          s.resultUnit,
          () =>
            run(async (M2) => {
              const lg = M2.sample.sampleLoad(s.id);
              if (lg) await showPaper(M2, lg, false);
            }),
          s.note,
        ),
      ),
    );
    try {
      const mine = (await M.api.cfList()).filter((x: CfListItem) => !x.sample);
      mineHost.replaceChildren(
        ...(mine.length
          ? mine.map((x) =>
              listRow(
                x.name,
                x.resultUnit,
                () => run(async (M2) => showPaper(M2, await M2.api.cfGet(x.key), true)),
                x.saved,
              ),
            )
          : [muted(te("Start_MineNone"))]),
      );
    } catch (e) {
      mineHost.replaceChildren(muted(M.api.cfPlain(e)));
    }
  };
  const units_ = async (): Promise<string[]> => (units ??= await unitChoices());

  /* ---------- 고치는 화면 ---------- */

  const showPaper = async (M: Mods, first: CfLogic, saved: boolean): Promise<void> => {
    const choices = await units_();
    let lg = first;
    let savedLg: CfLogic | null = saved ? first : null;
    let stack: CfLogic[] = [];
    let pick: DfPick = null;
    const pickedBox = (): string | null => (pick?.kind === "box" ? pick.id : null);
    let values: CfValues = {};
    let valueSig = "";
    let logics: NonNullable<CfEvalOptions["logics"]> = {};
    let logicSig = "";
    let logicNotes: string[] = [];
    let broken: CfBreak[] = [];
    let notes: string[] = [];
    let result: CfEvalResult;
    let busy = false;

    const unsaved = createTag(te("Unsaved"), "warning");
    const note = el("p", { className: "m02-df__note", attrs: { role: "status" } });
    const diagramHost = el("div");
    // 상자마다 색 바꾸기(정함 점검 9) — 고른 상자 판 머리에 하나
    const colorBox = el("input", {
      className: "m02-df__color-input",
      attrs: { type: "color", "aria-label": te("Color") },
    });
    colorBox.addEventListener("change", () => {
      const id = pickedBox();
      if (id) edit(M.model.setColor(lg, id, colorBox.value));
    });
    const colorRow = el("label", {
      className: "m02-df__color",
      children: [el("span", { text: te("Color") }), colorBox],
    });
    // 상자 이름 — 입력 · 함수 상자(출력 상자는 출력 판의 이름 칸) · 빈 이름 · 같은 이름은 안 받음
    const boxName = createInputField({ label: te("BoxName"), compact: true });
    boxName.input.addEventListener("change", () => {
      const box = lg.boxes.find((b) => b.id === pickedBox());
      if (!box) return;
      const next = boxName.input.value.trim();
      const taken = lg.boxes.some((b) => b.id !== box.id && b.name === next);
      if (taken) note.textContent = te("NameTaken", { v: next });
      if (!next || taken || next === box.name) return void (boxName.input.value = box.name);
      edit(M.model.updateBox(lg, box.id, { name: next }));
    });
    // 판마다 제 상태를 쥠 — 종류마다 따로 두고 숨기기만(갈아끼우면 편집기가 있다고 여김)
    const funcHost = el("div");
    const outHost = el("div");
    const inHost = el("div");
    const summaryHost = el("div");
    const linkHost = el("div");
    const pillHost = el("div");
    const detail = detailFrame();
    detail.settings.append(boxName.root, colorRow);
    detail.body.append(inHost, funcHost, outHost, linkHost, pillHost);

    const evalNow = (): CfEvalResult => {
      try {
        return M.ev.evalLogic(lg, values, { logics });
      } catch (e) {
        const cost = { 노무비: 0, 재료비: 0, 경비: 0, 값들: {}, 계: 0 };
        return { ports: {}, outputs: {}, cost, errors: [M.api.cfPlain(e)] };
      }
    };

    const edit = (next: CfLogic): void => {
      if (next === lg) return;
      stack = [...stack, lg];
      lg = next;
      redraw();
    };
    /** 다이어그램이 부른 바꿈 — 다이어그램이 제 옛 그림으로 한 번 더 그려도 다음 틱에 새로 */
    const editFromDiagram = (next: CfLogic): void => {
      edit(next);
      setTimeout(redraw);
    };

    /** 입력 값 다시 받기 — 물음이 바뀐 때만 · 같은 조작의 뒤끝이라 기록을 더 쌓지 않음 */
    const refreshValues = (): void => {
      // 조건 찾기 재료는 이어진 알약 값(지금 셈)을 함께 물음 — 값이 바뀌면 다시 받음
      const pill = (p: CfPort): unknown => result?.ports[p.box]?.[p.name] ?? null;
      const sig = JSON.stringify(queriesOf(lg, pill, M.model.elementPort).map((a) => a.q));
      if (sig === valueSig) return;
      valueSig = sig;
      void fetchValues(M.api.cfValues, lg, pill, M.model.elementPort).then(
        (got) => {
          if (sig !== valueSig) return;
          values = got.values;
          notes = got.errors.length ? [te("Values", { v: got.errors.join(" · ") })] : [];
          redraw();
        },
        (e: unknown) => {
          notes = [te("Values", { v: M.api.cfPlain(e) })];
          redraw();
        },
      );
    };

    /** 다른 로직 입력이 부르는 로직들 다시 읽기 — 부르는 열쇠가 바뀐 때만 */
    const refreshLogics = (): void => {
      const sig = JSON.stringify(lg.boxes.map((b) => b.input?.logic?.key ?? ""));
      if (sig === logicSig) return;
      logicSig = sig;
      const get = async (key: string): Promise<CfLogic | null> =>
        key.startsWith("DF-") ? M.api.cfGet(key) : M.sample.sampleLoad(key);
      void loadLogics(lg, get).then((got) => {
        if (sig !== logicSig) return;
        logics = got.logics;
        logicNotes = got.errors.length ? [te("Logics", { v: got.errors.join(" · ") })] : [];
        redraw();
      });
    };

    /** 고름 — 검증 칸 줄 · 알약 판의 상자 이름 누름 */
    const choose = (sel: CfSel): void => {
      const box = lg.boxes.find((b) => b.id === sel.box);
      pick = sel.link
        ? { kind: "link", id: sel.link }
        : box && sel.port
          ? { kind: "pill", box: box.id, port: sel.port, dir: M.model.portDir(box, sel.port) }
          : box
            ? { kind: "box", id: box.id }
            : null;
      redraw();
    };

    /** 흐름 길 — 알약 = 그 알약에서 앞뒤 · 선 = 보낸 알약 앞 · 받는 알약 뒤 */
    const traceNow = (): { back: CfStep[]; forward: CfStep[] } | null => {
      try {
        if (pick?.kind === "pill") {
          const p = { box: pick.box, name: pick.port };
          return { back: M.model.traceBack(lg, p), forward: M.model.traceForward(lg, p) };
        }
        const id = pick?.kind === "link" ? pick.id : "";
        const link = lg.links.find((l) => l.id === id);
        if (link)
          return {
            back: M.model.traceBack(lg, link.from),
            forward: M.model.traceForward(lg, link.to),
          };
      } catch {
        /* 따라갈 수 없으면 칠하지 않음 */
      }
      return null;
    };

    const name = createInputField({
      label: te("Name"),
      placeholder: te("NamePlaceholder"),
      value: lg.name,
      compact: true,
      onInput: (v) => edit({ ...lg, name: v }),
    });
    name.root.classList.add("m02-df__name");
    const unitList = choices.includes(lg.resultUnit) ? choices : [lg.resultUnit, ...choices];
    const unit = createSelectField({
      label: te("Unit"),
      options: unitList.map((u) => ({ value: u, text: u.replace(/^원\//, "") })),
      value: lg.resultUnit,
      compact: true,
      onChange: (v) => edit({ ...lg, resultUnit: v }),
    });

    const diagramOn = {
      select: (id: string | null, pill?: DfPillSel): void => {
        pick = pill
          ? { kind: "pill", ...pill }
          : !id
            ? null
            : lg.links.some((l) => l.id === id)
              ? { kind: "link", id }
              : { kind: "box", id };
        // 흐름 길 · 판을 새로 — 다이어그램이 제 그림을 그린 뒤
        setTimeout(redraw);
      },
      move: (id: string, x: number, y: number): void => edit(M.model.moveBox(lg, id, x, y)),
      link: (from: CfPort, to: CfPort): string | null => {
        const got = M.model.link(lg, from, to);
        if (got.why) return got.why;
        editFromDiagram(got.lg);
        return null;
      },
      unlink: (id: string): void => editFromDiagram(M.model.unlink(lg, id)),
      add: (kind: CfKind, x: number, y: number): void => {
        const got = M.model.addBox(lg, kind, x, y);
        pick = { kind: "box", id: got.box.id };
        editFromDiagram(got.lg);
      },
      remove: (id: string): void => {
        if (pickedBox() === id) pick = null;
        editFromDiagram(M.model.removeBox(lg, id));
      },
    };

    const drawPanel = (): void => {
      const boxId = pickedBox();
      if (boxId && !lg.boxes.some((b) => b.id === boxId)) pick = null;
      const box = lg.boxes.find((b) => b.id === pickedBox());
      drawHead(detail, lg, pick);
      // 설정 줄(상자 이름 · 색)은 상자를 고른 때만 — 선 · 알약이면 줄째 숨김
      (detail.settings.parentElement as HTMLElement).hidden = !box;
      colorRow.hidden = !box;
      boxName.root.hidden = !box || box.kind === "output";
      if (box && document.activeElement !== boxName.input) boxName.input.value = box.name;
      linkHost.hidden = pick?.kind !== "link";
      pillHost.hidden = pick?.kind !== "pill";
      if (pick?.kind === "link")
        M.line.renderLinkPanel(linkHost, lg, pick.id, { change: edit }, { values, logics });
      if (pick?.kind === "pill")
        M.pill.renderPillPanel(
          pillHost,
          lg,
          pick.box,
          pick.port,
          { pick: (id) => choose({ box: id }) },
          { values, logics },
        );
      drawWarnings(detail, pick, broken);
      if (box && /^#[0-9a-f]{6}$/i.test(box.color)) colorBox.value = box.color;
      funcHost.hidden = box?.kind !== "function";
      outHost.hidden = box?.kind !== "output";
      inHost.hidden = box?.kind !== "input";
      if (box?.kind === "input") M.input.renderInputPanel(inHost, lg, box.id, { change: edit });
      if (box?.kind === "function") M.func.renderFuncPanel(funcHost, lg, box.id, { change: edit });
      if (box?.kind === "output")
        M.output.renderOutputPanel(outHost, lg, box.id, { change: edit }, { result });
    };

    const redraw = (): void => {
      result = evalNow();
      refreshValues();
      refreshLogics();
      const linkId = pick?.kind === "link" ? pick.id : "";
      if (linkId && !lg.links.some((l) => l.id === linkId)) pick = null;
      try {
        broken = M.ev.breaks(lg, values, { logics });
      } catch {
        broken = result.breaks ?? [];
      }
      unsaved.hidden = lg === savedLg;
      undo.disabled = !stack.length;
      deleteButton.hidden = !lg.key;
      M.diagram.renderDiagram(diagramHost, lg, diagramOn, {
        values: result.ports,
        selected: pick?.kind === "box" || pick?.kind === "link" ? pick.id : null,
        selectedPill:
          pick?.kind === "pill" ? { box: pick.box, port: pick.port, dir: pick.dir } : null,
        trace: traceNow(),
        breaks: broken,
      });
      drawPanel();
      M.summary.renderSummary(
        summaryHost,
        lg,
        result,
        { change: edit, select: choose },
        { values },
      );
      note.textContent = [...notes, ...logicNotes, ...result.errors].slice(0, 4).join("\n");
    };

    const save = async (): Promise<void> => {
      if (busy) return;
      if (!lg.name.trim()) {
        note.textContent = te("NoName");
        return void name.input.focus();
      }
      let problems: string[] = [];
      try {
        problems = M.ev.checkLogic(lg, values, { logics });
      } catch {
        problems = [];
      }
      const ask = te("SaveAnyway", { v: problems.slice(0, 3).join(" · ") });
      if (problems.length && !(await showConfirmDialog(ask, te("Save")))) return;
      busy = true;
      note.textContent = te("Saving");
      const screen = result.cost.계;
      try {
        const got = await M.api.cfSave(lg);
        lg = got.logic;
        savedLg = lg;
        stack = [];
        redraw();
        const server = got.values.cost.계;
        if (Math.abs(server - screen) > 0.5)
          notes = [te("Differs", { s: formatMoney(server), c: formatMoney(screen) })];
        note.textContent = [...notes, ...result.errors].join("\n");
        showToast(te("Saved"), "success");
      } catch (e) {
        note.textContent = te("SaveFailed", { v: M.api.cfPlain(e) });
      } finally {
        busy = false;
      }
    };

    const doUndo = (): void => {
      const back = stack[stack.length - 1];
      if (!back) return;
      stack = stack.slice(0, -1);
      lg = back;
      name.input.value = lg.name;
      unit.select.value = lg.resultUnit;
      redraw();
    };

    const doDelete = async (): Promise<void> => {
      if (!lg.key || busy) return;
      if (!(await showConfirmDialog(te("Delete_Ask", { v: lg.name }), te("Delete")))) return;
      try {
        await M.api.cfDelete(lg.key);
        savedLg = lg;
        showToast(te("Deleted"), "success");
        void showStart();
      } catch (e) {
        note.textContent = M.api.cfPlain(e);
      }
    };

    const undo = createButton({ label: te("Undo"), variant: "ghost", size: "sm", onClick: doUndo });
    const deleteButton = createButton({
      label: te("Delete"),
      variant: "danger",
      size: "sm",
      onClick: () => void doDelete(),
    });
    strip.replaceChildren(
      name.root,
      unit.root,
      unsaved,
      el("div", {
        className: "m02-df__actions",
        children: [
          createButton({
            label: te("Standards"),
            variant: "ghost",
            size: "sm",
            onClick: () =>
              openModal({
                title: te("Standards"),
                closeLabel: te("Close"),
                mount: (host: HTMLElement) =>
                  M.std.renderStandards(host, { change: () => redraw() }, { title: false }),
              }),
          }),
          undo,
          createButton({ label: te("Save"), size: "sm", onClick: () => void save() }),
          deleteButton,
        ],
      }),
    );
    body.replaceChildren(
      note,
      el("div", {
        className: "m02-df__layout",
        children: [
          part(te("Diagram"), "m02-df__diagram", [diagramHost]),
          el("div", {
            className: "m02-df__lower",
            children: [detail.root, part(te("Summary"), "m02-df__summary", [summaryHost])],
          }),
        ],
      }),
    );
    paper = { dirty: () => lg !== savedLg, save, undo: doUndo };
    redraw();
    if (!lg.name) name.input.focus();
  };

  void showStart();
  document.body.style.overflow = "hidden"; // 뒤 페이지는 안 밀리고 시험판 페이지만 밀림
  document.body.append(page);
  page.tabIndex = -1;
  page.focus();
}

/** 고치는 화면의 큰 자리 — 제목 + 몸(안쪽 스크롤 없음 · 내용만큼 늘어남) */
function part(title: string, className: string, children: HTMLElement[]): HTMLElement {
  return el("section", {
    className: `m02-df__part ${className}`,
    children: [el("h3", { text: title }), el("div", { className: "m02-df__part-body", children })],
  });
}

/** 보통 크기 단추 — 칸 폭으로 늘어나지 않게 감쌈 */
function bigButton(label: string, onClick: () => void): HTMLElement {
  return el("div", { children: [createButton({ label, variant: "filled", size: "sm", onClick })] });
}