/* =============================================================================
 * line_stack_rows.ts
 * 줄 쌓기 공식 묶음(PLAN 804-2 · 요구 675) — 「이름 = 값」 · 「이름 = 식」 줄 묶음 · 틀 이름표 · [식으로 풀기] · [틀로 저장]
 *   접힘 = 값 줄은 값 칸(연결 값을 고쳐 적으면 숫자 = 고정값 · 요구 664) · 식 줄은 「이름 = 식 = 값」 글 · 단가산출 결과 기호 = [식으로 풀기]
 *   풀림 = 줄마다 이름 · 식 · 단위 칸 + 지움 · [+ 줄] — 이름 바꿈 = 문서 전부(`rename`) · 식 = 식 줄 · 수 = 숫자 연결
 *   틀 = 단가산출 결과 문서(굴착기 Q 등)를 이 문서 식으로 옮김(`unfold`) · 내 틀 = 이 브라우저 저장(localStorage) — 꼴이 바뀌면
 *     「내 틀 (틀 이름 에서 변경)」 · 빈 틀 = [찾아 넣기](돈 아닌 단가산출 결과 — 작업량 등)
 *   표 값(804-3) = [표 · 칸] 단추 → 표 고르기 창(`line_stack_pick.ts`) · 값 칸 누름 = 그 줄 · 칸(`pickCell`)
 * ========================================================================== */

import { createButton } from "@ui/ui_template_button";
import { eqText } from "@ui/ui_template_equation";
import { askText, el, showToast } from "@ui/ui_template_elements";
import { createInputField } from "@ui/ui_template_input";
import {
  DocError,
  rename,
  splitId,
  varId,
  type FormulaDoc,
} from "../common_util/common_util_formula_doc";
import { isNum } from "../common_util/common_util_formula_doc_calc";
import {
  dropSyms,
  freshId,
  newVar,
  setRow,
  shapeOf,
  unfold,
  type StackDoc,
  type StackItem,
  type StackLine,
} from "../common_util/common_util_line_stack";
import { boundConds, currentRow, pickCell } from "../common_util/common_util_line_stack_pick";
import { openFindPicker } from "../M02_MasterTemplete/M02_MasterTemplete_Find_Pick";
import type { EditHooks } from "./line_stack_edit";
import { openTablePick } from "./line_stack_pick";
import { lt } from "./line_stack_text";

/** 내 틀 — 기호 · 식 조각(이 브라우저) */
export interface Tpl {
  id: string;
  name: string;
  문서: FormulaDoc;
}

const clone = <T>(v: T): T => JSON.parse(JSON.stringify(v)) as T;
type Block = Extract<StackLine, { 꼴: "공식" }>;

/** 틀 넣기 — 새 공식 묶음 줄 */
export function insertTpl(d: StackDoc, t: Tpl): Block {
  const moved = unfold(d, t.문서);
  return { 꼴: "공식", 기호: moved, 틀: `my:${t.id}`, 틀꼴: shapeOf(d, moved) };
}

const LINK_TAG: Record<string, string> = {
  표: "표",
  요소: "요소",
  단가산출: "단가산출",
  선택: "선택",
  입력: "입력",
};

const input = (
  value: string,
  placeholder: string,
  cls: string,
  set: (t: string) => void,
): HTMLElement => {
  const f = createInputField({ value, placeholder, compact: true, size: 24 });
  f.root.classList.add(cls);
  f.input.addEventListener("change", () => set(f.input.value));
  return f.root;
};

export function buildBlock(h: EditHooks, i: number, j: number, line: Block): HTMLElement[] {
  const d = h.doc;
  const at = `${i}.${j}`;
  const open = h.open.has(at);
  const vals = (h.answer.값 ?? {}) as Record<string, unknown>;
  const vars = new Map((d.변수 ?? []).map((v) => [varId(v), v]));
  const lines = new Map((d.식 ?? []).map((l) => [String(l.기호 ?? ""), String(l.식 ?? "")]));
  const blockOf = (items: StackItem[]): Block => items[i].줄[j] as Block;
  const valText = (id: string): string => {
    const v = vals[id];
    if (isNum(v) || typeof v === "string") return `${eqText(v)} ${vars.get(id)?.단위 ?? ""}`.trim();
    if (v && typeof v === "object")
      return ["노무비", "재료비", "경비"]
        .map((c) => `${c} ${eqText((v as Record<string, unknown>)[c])}`)
        .join(" · ");
    return `— ${h.answer.빈값?.[id] ?? ""}`.trim();
  };

  // ── 이름표 ──
  const tplName = (k: string): string =>
    k.startsWith("my:")
      ? (h.templates().find((t) => `my:${t.id}` === k)?.name ?? lt("My_Tpl"))
      : (h.subDoc(k)?.이름 ?? (h.name(k) || k));
  const changed = !!line.틀 && !!line.틀꼴 && shapeOf(d, line.기호) !== line.틀꼴;
  const label = !line.틀
    ? lt("K_공식")
    : changed
      ? `${lt("My_Tpl")} (${tplName(line.틀)} ${lt("Changed_From")})`
      : tplName(line.틀);
  const head = el("div", {
    className: "lstk-fhead",
    children: [
      el("span", { className: "lstk-kind", text: label }),
      createButton({
        label: open ? lt("Fold") : lt("Unfold"),
        variant: "ghost",
        size: 24,
        onClick: () => {
          if (open) h.open.delete(at);
          else h.open.add(at);
          h.change(() => undefined);
        },
      }),
      createButton({
        label: lt("Save_Tpl"),
        variant: "ghost",
        size: 24,
        onClick: () =>
          void askText({ message: lt("Tpl_Name"), value: label }).then((name) => {
            if (!name?.trim()) return;
            const ids = new Set(line.기호);
            const id = `t${Date.now()}`;
            h.saveTpl({
              id,
              name: name.trim(),
              문서: {
                변수: clone((d.변수 ?? []).filter((v) => ids.has(varId(v)))),
                식: clone((d.식 ?? []).filter((l) => ids.has(String(l.기호 ?? "")))),
              },
            });
            h.change((doc, items) =>
              Object.assign(blockOf(items), { 틀: `my:${id}`, 틀꼴: shapeOf(doc, line.기호) }),
            );
          }),
      }),
    ],
  });
  head.dataset.tpl = changed ? "changed" : line.틀 ? "tpl" : "";

  // ── 표 값 — [표 · 칸] → 표 고르기 ──
  const tableBtn = (id: string, link: NonNullable<FormulaDoc["변수"]>[number]["연결"] & object) => {
    const b = createButton({
      label:
        [
          lt("Tbl"),
          ...Object.values(link.조건 ?? {}).flatMap((t) =>
            /^'.*'$/.test(String(t)) ? [String(t).slice(1, -1)] : [],
          ),
          link.칸,
        ]
          .filter(Boolean)
          .join(" · ") + " ▾", // 고른 줄(글 조건) · 칸
      variant: "ghost",
      size: 24,
      onClick: () =>
        void h.table(String(link.표 ?? "")).then((t) => {
          if (!t) return void showToast(lt("Tbl_Missing"), "warning");
          openTablePick({
            table: t,
            now: currentRow(t, link, vals),
            col: String(link.칸 ?? ""),
            bound: boundConds(d, link),
            done: (row, col) => h.change((doc) => pickCell(doc, id, t, row, col)),
          });
        }),
    });
    b.dataset.tablePick = id;
    b.title = h.name(String(link.표 ?? "")) || String(link.표 ?? "");
    return b;
  };

  // ── 줄 ──
  const renameRow = (old: string, now: string): void => {
    const t = now.trim();
    if (!t || t === old) return;
    try {
      const copy = clone(d);
      const [s, lo, up] = splitId(t);
      rename(copy, old, s, lo, up);
    } catch (e) {
      if (e instanceof DocError) return void showToast(lt("Bad_Name"), "warning");
      throw e;
    }
    h.change((doc, items) => {
      const [s, lo, up] = splitId(t);
      rename(doc, old, s, lo, up);
      for (const it of items)
        for (const l of it.줄) if (l.꼴 === "공식") l.기호 = l.기호.map((x) => (x === old ? t : x));
    });
  };
  const unfoldRow = (id: string, sub: FormulaDoc, key: string): void =>
    h.change((doc, items) => {
      const moved = unfold(doc, sub, id);
      const blk = blockOf(items);
      blk.기호 = blk.기호.filter((x) => x !== id);
      items[i].줄.splice(j + 1, 0, { 꼴: "공식", 기호: moved, 틀: key, 틀꼴: shapeOf(doc, moved) });
      if (!blk.기호.length) items[i].줄.splice(j, 1);
    });
  const rows = line.기호.map((id) => {
    const v = vars.get(id);
    const link = v?.연결;
    const expr = lines.get(id);
    const sub = link?.갈래 === "단가산출" && link.키 ? h.subDoc(link.키) : null;
    const tag =
      link?.갈래 === "표" && !expr
        ? tableBtn(id, link)
        : link && LINK_TAG[link.갈래 ?? ""] && !expr
          ? el("span", {
              className: "lstk-tag",
              text: `${LINK_TAG[link.갈래!]}${link.키 && !link.키.includes("{") ? ` · ${sub?.이름 ?? h.name(link.키) ?? ""}` : ""}`,
            })
          : null;
    const tools: HTMLElement[] = [];
    if (sub?.결과 && link?.키)
      tools.push(
        createButton({
          label: lt("Unfold"),
          variant: "ghost",
          size: 24,
          onClick: () => unfoldRow(id, sub, link.키!),
        }),
      );
    if (link?.갈래 === "단가산출" && !link.키)
      tools.push(
        createButton({
          label: lt("Find_Title"),
          variant: "ghost",
          size: 24,
          onClick: () =>
            openFindPicker({
              layer: "system",
              owner: null,
              title: lt("K_틀"),
              kinds: ["logic"],
              results: true,
              logic: (x) =>
                h.change((doc) => {
                  const y = doc.변수?.find((z) => varId(z) === id);
                  if (y) y.연결 = { 갈래: "단가산출", 키: x.키, 입력: {} };
                }),
            }),
        }),
      );
    const name = el("b", { className: "lstk-sym", text: id });
    const valueOf =
      expr ??
      (link?.갈래 === "숫자" ? String(link.값 ?? "") : isNum(vals[id]) ? String(vals[id]) : "");
    let body: (HTMLElement | string)[];
    if (open)
      body = [
        input(id, lt("Row_Name"), "lstk-f-s", (t) => renameRow(id, t)),
        "=",
        input(valueOf, lt("Row_Expr"), "lstk-f-l", (t) => h.change((doc) => setRow(doc, id, t))),
        input(v?.단위 ?? "", lt("Unit"), "lstk-f-s", (t) =>
          h.change((doc) => {
            let x = doc.변수?.find((y) => varId(y) === id);
            if (!x) (doc.변수 ??= []).push((x = newVar(id, { 갈래: "식" })));
            x.단위 = t.trim();
          }),
        ),
        el("span", { className: "lstk-val", text: `= ${valText(id)}` }),
        createButton({
          label: "×",
          variant: "danger-ghost",
          size: 24,
          onClick: () => h.change((doc) => dropSyms(doc, [id])),
        }),
      ];
    else if (expr !== undefined || sub || link?.갈래 === "단가산출")
      body = [
        name,
        `= ${expr ?? ""}${expr ? " =" : ""}`,
        el("span", { className: "lstk-val", text: valText(id) }),
      ];
    else
      body = [
        name,
        "=",
        input(valueOf, valText(id), "lstk-f-m", (t) => h.change((doc) => setRow(doc, id, t))),
        el("span", { className: "lstk-unit", text: v?.단위 ?? "" }),
      ];
    const row = el("div", {
      className: `lstk-frow ${open ? "is-open" : ""}`,
      children: [...body, ...(tag ? [tag] : []), ...tools],
    });
    row.dataset.sym = id;
    return row;
  });
  const more = open
    ? [
        createButton({
          label: lt("Add_Row"),
          variant: "ghost",
          size: 24,
          onClick: () =>
            h.change((doc, items) => {
              const id = freshId(doc, "x");
              (doc.변수 ??= []).push(newVar(id, { 갈래: "숫자", 값: 0 }));
              blockOf(items).기호.push(id);
            }),
        }),
      ]
    : [];
  return [head, ...rows, ...more];
}