/* =============================================================================
 * M01_MasterData_UI_LogicLab_Copy.ts
 * 복사해서 만들기(PLAN 3-4 · 계약 7장) — 정본·자체 로직을 별칭 꼴 식으로 펴 보이고
 * 줄을 고치거나 더한 뒤 자체 로직(GX)으로 저장.
 *
 * [본떠 만들기] → GET /logic/formula(별칭 폼) → 별칭 표 바꾸기·로직 부르기 갈래 고르기·
 * 식 줄 고치기·더하기 → [시험 계산](POST /logic/formula/preview 로 원문 되돌린 뒤 /calc 재사용)
 * → [저장](POST /logic/formula/save) → afterSave 로 새 키를 알림(정본은 손대지 않음).
 * ========================================================================== */

import {
  createButton,
  createInputField,
  createSelectField,
  el,
  hideLoadingOverlay,
  showLoadingOverlay,
  showToast,
} from "@ui/ui_template_elements";
import {
  copyLogic,
  fetchLogicFormula,
  previewLogicFormula,
  saveLogicFormula,
  type FormulaAlias,
  type FormulaLine,
  type LogicRow,
} from "./M01_MasterData_UI_Logic_Api";
import { buildCalc } from "./M01_MasterData_UI_Logic_Calc";
import { fetchTables, type TableHead } from "./M01_MasterData_Api_Fetch";
import { tx } from "./M01_MasterData_UI_Logic_Text";
import { tl } from "./M01_MasterData_UI_LogicLab_Text";
import "./M01_MasterData_UI_LogicLab_Style.css";

const OWNERS = ["현장", "공용"] as const;
const TABLE_GROUPS = ["소요량", "계수"] as const;
const GROUP_LABEL: Record<FormulaLine["갈래"], string> = {
  중간: "중간",
  호표: "호표",
  덧줄: "덧줄",
  결과: "결과",
};

export interface CopyOptions {
  /** 본뜰 원본 키(정본·자체 둘 다) */
  key: string;
  /** 저장 뒤 새 GX 키를 알림 — 밖(LogicLab)이 목록 새로고침·그 키 열기를 함 */
  afterSave: (newKey: string) => void | Promise<void>;
}

/** 자리표(`호표[0].수량` 등)로 로직 안 그 칸을 읽고 씀 — `master_copy.slots()` 와 같은 자리 */
function field(row: LogicRow, place: string): { get: () => string; set: (v: string) => void } {
  if (place === "결과.식") {
    return {
      get: () => row.결과?.식 ?? "",
      set: (v) => {
        if (row.결과) row.결과.식 = v;
      },
    };
  }
  const m = /^(호표|중간|덧줄)\[(\d+)\]\.(.+)$/.exec(place);
  if (!m) return { get: () => "", set: () => {} };
  const [, group, idxStr, col] = m;
  const idx = Number(idxStr);
  const arr = row[group] as Record<string, unknown>[] | undefined;
  return {
    get: () => (arr?.[idx] ? String(arr[idx][col] ?? "") : ""),
    set: (v) => {
      if (arr?.[idx]) arr[idx][col] = v;
    },
  };
}

/** 별칭 원문의 키만 갈아 끼움 — 「찾기(QF000421, …)」 → 「찾기(QF999999, …)」(인자는 그대로) */
function swapKey(raw: string, newKey: string): string {
  return raw.replace(/^(찾기|로직)\(\s*[A-Za-z0-9]+/, `$1(${newKey}`);
}

/** 표 바꾸기 모달 — 소요량·계수 두 그룹을 함께 찾음 */
function openTablePick(onPick: (table: TableHead) => void): void {
  const close = (): void => backdrop.remove();
  const search = createInputField({ type: "search", placeholder: tl("Copy_PickSearch") });
  const list = el("div", { className: "m01-logic__pick-list" });
  const dialog = el("div", {
    className: "m01-logic__pick",
    attrs: { role: "dialog", "aria-label": tl("Copy_PickTitle") },
    children: [
      el("div", {
        className: "m01lab__modal-top",
        children: [
          el("h3", { text: tl("Copy_PickTitle") }),
          createButton({ label: tl("Modal_Close"), variant: "ghost", onClick: close }),
        ],
      }),
      search.root,
      list,
    ],
  });
  const backdrop = el("div", { className: "m01-logic__backdrop", children: [dialog] });
  backdrop.addEventListener("click", (ev) => ev.target === backdrop && close());
  backdrop.addEventListener("keydown", (ev) => ev.key === "Escape" && close());
  document.body.append(backdrop);
  search.input.focus();

  let timer: number | undefined;
  const run = async (): Promise<void> => {
    const q = search.input.value.trim();
    const pages = await Promise.all(
      TABLE_GROUPS.map((group) => fetchTables(group, "", "", q, 1, 20)),
    );
    const hits = pages.flatMap((p) => p.tables);
    list.replaceChildren(
      ...(hits.length
        ? hits.map((t) => {
            const b = el("button", {
              className: "m01-logic__pick-row m01-logic__pick-row--button",
              attrs: { type: "button" },
              children: [
                el("span", { text: `${t.이름 || t.키} · ${t.원문번호 || ""}` }),
                el("span", { className: "m01-logic__muted", text: t.키 }),
              ],
            });
            b.addEventListener("click", () => {
              onPick(t);
              close();
            });
            return b;
          })
        : [el("p", { className: "m01-logic__muted", text: tl("Copy_PickNone") })]),
    );
  };
  search.input.addEventListener("input", () => {
    window.clearTimeout(timer);
    timer = window.setTimeout(() => void run(), 250);
  });
  void run();
}

function aliasRow(a: FormulaAlias, onSwap: (raw: string) => void, sub: HTMLElement): HTMLElement {
  const about =
    a.종류 === "찾기"
      ? [a.밑이름 || a.참조, Object.keys(a.값칸).join("·")].filter(Boolean).join(" · ")
      : [a.밑이름 || a.참조, a.결과단위].filter(Boolean).join(" · ");
  return el("div", {
    className: "m01lab__box",
    children: [
      el("div", {
        className: "m01-logic__section-head",
        children: [
          el("strong", { text: a.이름 }),
          el("span", { className: "m01-logic__muted", text: about }),
        ],
      }),
      el("pre", { className: "m01lab__expr", text: a.원문 }),
      sub,
      ...(a.종류 === "찾기"
        ? [
            createButton({
              label: tl("Copy_Alias_Swap"),
              variant: "ghost",
              onClick: () => openTablePick((t) => onSwap(swapKey(a.원문, t.키))),
            }),
          ]
        : []),
    ],
  });
}

function logicAliasControls(
  a: FormulaAlias,
  onForked: (raw: string) => void,
): { root: HTMLElement } {
  let forked = false;
  const original = a.원문;
  const status = el("span", { className: "m01-logic__muted" });
  const refBtn = createButton({
    label: tl("Copy_Alias_Ref"),
    variant: "ghost",
    onClick: () => {
      forked = false;
      a.원문 = original;
      refresh();
    },
  });
  const forkBtn = createButton({
    label: tl("Copy_Alias_Fork"),
    variant: "ghost",
    onClick: () => void doFork(),
  });
  const refresh = (): void => {
    refBtn.disabled = !forked;
    forkBtn.disabled = forked;
    status.textContent = forked ? tl("Copy_Alias_Forked") : "";
  };
  const doFork = async (): Promise<void> => {
    try {
      const got = await copyLogic(a.참조);
      forked = true;
      a.원문 = swapKey(original, got.key);
      onForked(a.원문);
      refresh();
    } catch (error) {
      showToast(error instanceof Error ? error.message : tx("Load_Failed"), "error");
    }
  };
  refresh();
  return { root: el("div", { children: [refBtn, forkBtn, status] }) };
}

function lineBox(row: LogicRow, line: FormulaLine, onChange: () => void): HTMLElement {
  const f = field(row, line.자리);
  const box = el("textarea", { className: "m01-logic__input m01lab__qty" });
  box.value = f.get();
  box.rows = Math.max(1, Math.ceil(box.value.length / 60));
  box.addEventListener("input", () => {
    f.set(box.value);
    onChange();
  });
  const tag = [GROUP_LABEL[line.갈래], line.비목].filter(Boolean).join(" · ");
  return el("div", {
    className: "m01lab__box",
    children: [
      el("div", {
        className: "m01-logic__section-head",
        children: [
          el("strong", { text: line.이름 || line.자리 }),
          el("span", { className: "m01-logic__tag", text: tag }),
          ...(line.단위 ? [el("span", { className: "m01-logic__muted", text: line.단위 })] : []),
        ],
      }),
      box,
    ],
  });
}

function addExtra(row: LogicRow, onChange: () => void, redraw: () => void): void {
  row.덧줄 = row.덧줄 ?? [];
  row.덧줄.push({ 이름: tl("Copy_ExtraName"), 식: "0", 비목: "재료비" });
  onChange();
  redraw();
}

/** 복사 화면을 전체 덮는 시트로 엶 */
export async function openCopyScreen(opt: CopyOptions): Promise<void> {
  showLoadingOverlay();
  let got;
  try {
    got = await fetchLogicFormula(opt.key);
  } catch (error) {
    hideLoadingOverlay();
    showToast(error instanceof Error ? error.message : tx("Load_Failed"), "error");
    return;
  }
  hideLoadingOverlay();

  const row: LogicRow = got.로직;
  const marks: FormulaAlias[] = got.별칭;
  const nameField = createInputField({ label: tl("Copy_Name"), value: `${row.이름} 복사본` });
  const ownerField = createSelectField({
    label: tl("Copy_Owner"),
    options: OWNERS.map((o) => ({
      value: o,
      text: o === "현장" ? tl("Copy_Site") : tl("Copy_Shared"),
    })),
    value: "현장",
  });

  const aliasHost = el("div", { className: "m01-logic__scroll" });
  const linesHost = el("div", { className: "m01-logic__scroll" });
  const calcHost = el("div", { className: "m01lab__calc" });
  const values: Record<string, string> = {};
  let timer: number | undefined;

  const refreshCalc = (): void => {
    window.clearTimeout(timer);
    timer = window.setTimeout(() => void runPreview(), 300);
  };
  const runPreview = async (): Promise<void> => {
    try {
      const preview = await previewLogicFormula(row, marks);
      buildCalc(calcHost, {
        savedKey: null,
        file: got.file,
        row: preview.logic,
        dirty: () => true,
        values,
        onLines: () => undefined,
      });
    } catch (error) {
      calcHost.replaceChildren(
        el("p", { className: "m01-logic__bad", text: error instanceof Error ? error.message : "" }),
      );
    }
  };

  const drawLines = (): void => {
    linesHost.replaceChildren(...got.줄.map((line) => lineBox(row, line, refreshCalc)));
  };
  const drawAliases = (): void => {
    aliasHost.replaceChildren(
      ...marks.map((a) => {
        const sub =
          a.종류 === "로직" ? logicAliasControls(a, refreshCalc).root : el("span", { text: "" });
        return aliasRow(
          a,
          (raw) => {
            a.원문 = raw;
            refreshCalc();
          },
          sub,
        );
      }),
    );
  };
  drawLines();
  drawAliases();
  refreshCalc();

  const close = (): void => backdrop.remove();
  const onSave = async (): Promise<void> => {
    showLoadingOverlay();
    try {
      const saved = await saveLogicFormula({
        로직: row,
        별칭: marks,
        owner: ownerField.select.value,
        이름: nameField.input.value.trim() || row.이름,
        본뜬키: opt.key,
      });
      showToast(tl("Copy_Saved"), "success");
      close();
      await opt.afterSave(saved.key);
    } catch (error) {
      showToast(error instanceof Error ? error.message : tx("Save_Failed"), "error");
    } finally {
      hideLoadingOverlay();
    }
  };

  const sheet = el("div", {
    className: "m01-logic__pick m01copy__sheet",
    attrs: { role: "dialog", "aria-label": tl("Copy_Title") },
    children: [
      el("div", {
        className: "m01lab__modal-top",
        children: [
          el("h3", { text: `${tl("Copy_Title")} — ${row.이름}(${opt.key})` }),
          createButton({ label: tl("Copy_Cancel"), variant: "ghost", onClick: close }),
        ],
      }),
      el("div", {
        className: "m01copy__head",
        children: [nameField.root, ownerField.root],
      }),
      el("section", {
        className: "m01-logic__section",
        children: [el("h3", { text: tl("Copy_Aliases") }), aliasHost],
      }),
      el("section", {
        className: "m01-logic__section",
        children: [
          el("div", {
            className: "m01-logic__section-head",
            children: [
              el("h3", { text: tl("Copy_Lines") }),
              createButton({
                label: tl("Copy_AddExtra"),
                variant: "ghost",
                onClick: () => addExtra(row, refreshCalc, drawLines),
              }),
            ],
          }),
          linesHost,
        ],
      }),
      el("section", { className: "m01-logic__section", children: [calcHost] }),
      el("div", {
        className: "m01-logic__pick-bar",
        children: [
          el("span", {}),
          el("span", {}),
          createButton({ label: tl("Copy_Save"), onClick: () => void onSave() }),
        ],
      }),
    ],
  });
  const backdrop = el("div", { className: "m01-logic__backdrop", children: [sheet] });
  backdrop.addEventListener("click", (ev) => ev.target === backdrop && close());
  backdrop.addEventListener("keydown", (ev) => ev.key === "Escape" && close());
  document.body.append(backdrop);
}