/* =============================================================================
 * M01_MasterData_UI_Logic_Pick.ts
 * 요소 찾기 창 — 그룹 전체에서 이름·열쇠로 찾아 호표 줄에 넣음(`GET /elements`)
 * 표 고르기(소요량·계수)는 값칸 단추를 눌러 `찾기(…).칸` 으로 수량에 넣음
 * ========================================================================== */

import { createButton, el, showToast } from "@ui/ui_template_elements";
import { searchElements, type ElementBrief } 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 select = el("select", { className: "m01-logic__input" });
  for (const g of groups) select.append(el("option", { text: g, attrs: { value: g } }));
  select.value = groups.includes(group) ? group : groups[0];
  const search = el("input", {
    className: "m01-logic__input",
    attrs: { type: "search", placeholder: tx("Pick_Search") },
  });
  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: [select, search, 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;
}