/* =============================================================================
 * M01_MasterData_UI_Logic_Pick.ts
 * 고르기 두 가지
 *  ① 요소 찾기 창 — 그룹 전체에서 이름·키·원문번호로 찾아 호표 줄에 넣음(`GET /elements`)
 *     표 고르기(소요량·계수)는 값칸 단추를 눌러 `찾기(…).칸` 으로 수량에 넣음
 *  ② 재료·기계 바꿔 고르기 — 구분 → 상세구분 → 후보 순으로 좁힘
 *     바꾼 것은 시험 계산용 복사본에만 · 정본 로직은 그대로
 * ========================================================================== */

import {
  createButton,
  createInputField,
  createSelectField,
  el,
  showToast,
} from "@ui/ui_template_elements";
import {
  fetchMaterials,
  searchElements,
  searchPrice,
  type ElementBrief,
  type HoLine,
  type LogicOne,
  type LogicRow,
} from "./M01_MasterData_UI_Logic_Api";
import { formatNumber, type PickDone, type PickMode } from "./M01_MasterData_UI_Logic_Edit";
import { tx } from "./M01_MasterData_UI_Logic_Text";

const GROUPS: Record<PickMode, string[]> = {
  element: ["인력", "재료", "기계", "로직"],
  table: ["소요량", "계수"],
};

export function openPicker(mode: PickMode, group: string, done: PickDone): void {
  const groups = GROUPS[mode];
  const groupField = createSelectField({
    options: groups.map((g) => ({ value: g, text: g })),
    value: groups.includes(group) ? group : groups[0],
    compact: true,
  });
  const select = groupField.select;
  const searchField = createInputField({ type: "search", placeholder: tx("Pick_Search") });
  const search = searchField.input;
  const count = el("span", { className: "m01-logic__muted" });
  const list = el("div", { className: "m01-logic__pick-list" });
  const close = (): void => backdrop.remove();
  const dialog = el("div", {
    className: "m01-logic__pick",
    attrs: { role: "dialog", "aria-label": tx("Pick_Title") },
    children: [
      el("div", {
        className: "m01-logic__section-head",
        children: [
          el("h3", { text: tx("Pick_Title") }),
          createButton({ label: tx("Pick_Close"), variant: "ghost", onClick: close }),
        ],
      }),
      el("div", {
        className: "m01-logic__pick-bar",
        children: [groupField.root, searchField.root, count],
      }),
      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());

  const choose = (item: ElementBrief, column?: string): void => {
    close();
    done(item, column);
  };
  let seq = 0;
  const load = async (): Promise<void> => {
    const mine = ++seq;
    try {
      const found = await searchElements(select.value, search.value.trim());
      if (mine !== seq) return; // 최신 응답만
      count.textContent = tx("Pick_Total", { n: found.total });
      list.replaceChildren(...found.items.map((item) => itemRow(item, mode, choose)));
    } catch (error) {
      showToast(error instanceof Error ? error.message : tx("Load_Failed"), "error");
    }
  };
  let timer = 0;
  search.addEventListener("input", () => {
    window.clearTimeout(timer);
    timer = window.setTimeout(load, 250);
  });
  select.addEventListener("change", load);
  document.body.append(backdrop);
  search.focus();
  void load();
}

function itemRow(
  item: ElementBrief,
  mode: PickMode,
  choose: (item: ElementBrief, column?: string) => void,
): HTMLElement {
  const text = el("div", {
    className: "m01-logic__stack",
    children: [
      el("strong", { text: `${item.이름 ?? ""} ${item.규격 ?? ""}`.trim() }),
      el("span", { className: "m01-logic__muted", text: item.ref }),
    ],
  });
  if (mode === "table") {
    const columns = Object.keys(item.값칸 ?? {});
    const chips = columns.map((column) =>
      createButton({ label: column, variant: "pill", onClick: () => choose(item, column) }),
    );
    return el("div", {
      className: "m01-logic__pick-row",
      children: [text, el("div", { className: "m01-logic__chips", children: chips })],
    });
  }
  const unit = typeof item.단위 === "string" ? item.단위 : "";
  const value = typeof item.값 === "object" && item.값 !== null ? "{…}" : formatNumber(item.값);
  const row = el("button", {
    className: "m01-logic__pick-row m01-logic__pick-row--button",
    attrs: { type: "button" },
    children: [
      text,
      el("span", { className: "m01-logic__money", text: `${value} ${unit}`.trim() }),
    ],
  });
  row.addEventListener("click", () => choose(item));
  return row;
}

/* ── ② 재료·기계 바꿔 고르기 ─────────────────────────────────────────────── */

export type Swaps = Map<number, ElementBrief>;

const PICKABLE = ["재료", "기계"];

/** 고를 수 있는 줄이 있는지 */
export const hasPickable = (logic: LogicRow): boolean =>
  (logic.호표 ?? []).some((l) => PICKABLE.includes(l.종류));

/** 바꿔 본 줄이 있으면 고친 복사본 — 없으면 undefined(정본 그대로 셈) */
export function swappedRow(logic: LogicRow, swaps: Swaps): LogicRow | undefined {
  if (!swaps.size) return undefined;
  return {
    ...logic,
    호표: (logic.호표 ?? []).map((l, i) => {
      const s = swaps.get(i);
      return s ? { ...l, 요소: s.ref, 이름: s.이름 ?? l.이름, 규격: s.규격 ?? l.규격 } : l;
    }),
  };
}

type Brief = ElementBrief & {
  구분?: string;
  상세구분?: string;
  값들?: Record<string, unknown>;
};

const distinct = (items: Brief[], key: "구분" | "상세구분"): string[] => [
  ...new Set(items.map((i) => i[key]).filter((v): v is string => !!v)),
];

/** 후보 글 — 값 열이 여럿이면 있는 열을 다 보임(계산은 그 가운데 낮은 값) */
const label = (it: Brief): string => {
  const cols = Object.entries(it.값들 ?? {})
    .filter(([, v]) => v !== null && v !== undefined)
    .map(([k, v]) => `${k} ${formatNumber(v)}`);
  const prices = cols.length ? cols : [formatNumber(it.값) || tx("Mat_NoPrice")];
  return [`${it.이름 ?? ""} ${it.규격 ?? ""}`.trim(), ...prices].join(" · ");
};

const oldNames = (one: LogicOne, line: HoLine): string[] => {
  const brief = one.prices[line.요소 as string] as { 이름?: string; 원문번호?: string } | null;
  const names = [brief?.이름, brief?.원문번호, (line.이름 ?? "").split(/[\s(·]/)[0]];
  return [...new Set(names.filter((n): n is string => !!n))];
};

/** 이름을 차례로 찾아 후보가 나오는 첫 결과 — 다 비면 마지막 결과 */
async function firstFound(names: string[]): Promise<Awaited<ReturnType<typeof searchPrice>>> {
  let last = await searchPrice(names[0] ?? "");
  for (const name of names.slice(1)) {
    if (last.items.length) break;
    last = await searchPrice(name);
  }
  return last;
}

function swapRow(one: LogicOne, line: HoLine, i: number, swaps: Swaps, onChange: () => void) {
  const cond =
    typeof line.요소 === "object" ? (line.요소 as unknown as Record<string, unknown>) : null;
  const price = cond ? undefined : one.prices[line.요소]?.값;
  let all: Brief[] = [];
  let sub = "";
  let detail = String(cond?.["상세구분"] ?? "");

  const subBox = createSelectField({
    options: [],
    value: "",
    compact: true,
    onChange: (v) => ((sub = v), (detail = ""), fill()),
  });
  const detailBox = createSelectField({
    options: [],
    value: "",
    compact: true,
    onChange: (v) => ((detail = v), fill()),
  });
  const itemBox = createSelectField({
    options: [{ value: "", text: tx("Mat_Default") }],
    value: "",
    onChange: (ref) => {
      const item = all.find((it) => it.ref === ref);
      if (item) swaps.set(i, item);
      else swaps.delete(i);
      onChange();
    },
  });
  const subRow = el("div", {
    className: "m01-test__filters",
    children: [subBox.root, detailBox.root],
  });

  // 구분 → 상세구분 → 후보 — 앞 단을 고르면 뒷 단 목록이 좁혀짐(구분 칸이 없는 후보면 그 단은 숨김)
  const fill = (): void => {
    const subs = distinct(all, "구분");
    const inSub = all.filter((it) => !sub || it.구분 === sub);
    const details = distinct(inSub, "상세구분");
    const inDetail = inSub.filter((it) => !detail || it.상세구분 === detail);
    const all_ = { value: "", text: tx("Pick_All") };
    subBox.root.hidden = subs.length < 1;
    detailBox.root.hidden = details.length < 1;
    subBox.setOptions([all_, ...subs.map((v) => ({ value: v, text: v }))], sub);
    detailBox.setOptions([all_, ...details.map((v) => ({ value: v, text: v }))], detail);
    itemBox.setOptions(
      [
        { value: "", text: tx("Mat_Default") },
        ...inDetail.map((it) => ({ value: it.ref, text: label(it) })),
      ],
      swaps.get(i)?.ref ?? "",
    );
  };

  // 고르기 조건({구분, 상세구분, 규격}) 줄 = 조건 안 후보 · 옛 줄 = 이름으로 찾은 후보
  const found = cond
    ? fetchMaterials({
        sub: String(cond["구분"] ?? ""),
        spec: String(cond["규격"] ?? ""),
        region: "울진",
      })
    : line.종류 === "재료"
      ? firstFound(oldNames(one, line)) // 옛 줄(고르기 조건 없음) — 품셈재료 이름 → 원문번호 → 이름 첫 낱말 순으로 찾아 나온 첫 것
      : searchElements(line.종류, line.이름 ?? "");
  void found
    .then((r) => {
      all = r.items as Brief[];
      if (cond) sub = String(cond["구분"] ?? "");
      fill();
    })
    .catch(() => undefined);

  const spec = line.규격 ? ` ${line.규격}` : "";
  const cost =
    price !== undefined && price !== null ? ` · ${tx("Mat_Price")} ${formatNumber(price)}` : "";
  return el("div", {
    className: "m01-test__pick",
    children: [
      el("strong", { text: `${line.종류} · ${line.이름 ?? String(line.요소)}${spec}` }),
      el("span", { className: "m01c__muted", text: `${line.단위 ?? ""}${cost}` }),
      subRow,
      itemBox.root,
    ],
  });
}

/** 재료·기계 줄마다 한 칸씩 — 한 번 만들어 두고 다시 그릴 때 같은 노드를 씀(고른 것이 안 날아감) */
export function pickPanel(one: LogicOne, swaps: Swaps, onChange: () => void): HTMLElement {
  const rows = (one.logic.호표 ?? [])
    .map((line, i) => ({ line, i }))
    .filter((x) => PICKABLE.includes(x.line.종류))
    .map((x) => swapRow(one, x.line, x.i, swaps, onChange));
  return el("div", {
    className: "m01-test__picks",
    children: rows.length ? rows : [el("p", { text: tx("Mat_None") })],
  });
}