/* =============================================================================
 * B01_Dashboard_UI_CalcSites.ts
 * 「계산 자리」 창(PLAN 504-2 · 504-3 · 요구 309-2 · 312) — 시스템 관리자만(카드 = `settingLinks` · 쓰기 = 서버
 * `require_system_admin`). 묶음 12 머리 + 그 아래 계산 45 줄(번호 · 이름 = 등록부 `label`) · 칸 둘(「조작 중
 * 브라우저 셈」 · 「[저장] 서버 정본」 늘 켬 · 잠금). 묶음 머리 체크 = 그 묶음 전부.
 * 바꿀 수 있는 줄 = 서버 판 `groups[].switchable`(판 열쇠 = 묶음) · 나머지는 잠긴 체크 + 까닭 글.
 * 고침은 창 안 사본에만 · [저장] 때만 바뀐 줄을 PUT(선례 `app_settings.ts`).
 * ========================================================================== */

import { createButton, el, showToast } from "@ui/ui_template_elements";
import { table } from "@ui/ui_template_general_blocks";
import { askLeave } from "@ui/ui_template_leave_dialog";
import { openModal } from "@ui/ui_template_modal";
import {
  fetchCalcSites,
  saveCalcSites,
  type CalcSiteGroup,
  type CalcSiteValue,
  type CalcSitesBoard,
} from "../A00_Common/design/design_calc_sites";
import { CALC_REGISTRY } from "../A00_Common/design/logic/design_calc_registry";
import { L } from "./B01_Dashboard_UI_Common";

type LocaleKey = Parameters<typeof L>[0];
const K = (key: string): string => L(`B01_CalcSites_${key}` as LocaleKey);

function check(checked: boolean, locked: boolean): HTMLInputElement {
  const input = el("input", { attrs: { type: "checkbox" } });
  input.checked = checked;
  input.disabled = locked;
  return input;
}

const LABELS = new Map(CALC_REGISTRY.map((entry) => [entry.no, entry.label]));

/** 묶음 머리 줄 + 계산 한 줄씩. 바꿀 수 있는 묶음은 머리 · 줄 체크가 같은 값(서로 따라감). */
function groupRows(
  group: CalcSiteGroup,
  draft: Record<string, CalcSiteValue>,
  changed: () => void,
): HTMLElement[][] {
  const server = (): HTMLInputElement => check(group.fixed !== "browser", true);
  const why = (no: string): string => K(`Why_${group.whys?.[no] ?? group.why ?? group.key}`);
  const head = el("span", {
    children: [el("strong", { text: K(group.key) }), ` (${group.nos.length})`],
  });
  if (!group.switchable) {
    const browser = (): HTMLInputElement => check(group.fixed !== "server", true);
    return [
      [head, browser(), server(), el("span")],
      ...group.nos.map((no) => [calcName(no), browser(), server(), el("span", { text: why(no) })]),
    ];
  }
  const boxes = [group.key, ...group.nos].map((id, index) => {
    const box = check(draft[group.key] !== "server", false);
    if (index === 0) box.dataset.calcSite = group.key;
    else box.dataset.calcNo = id;
    return box;
  });
  for (const box of boxes) {
    box.addEventListener("change", () => {
      draft[group.key] = box.checked ? "both" : "server";
      for (const other of boxes) other.checked = box.checked;
      changed();
    });
  }
  return [
    [head, boxes[0], server(), el("span")],
    ...group.nos.map((no, index) => [
      calcName(no),
      boxes[index + 1],
      server(),
      el("span", { text: why(no) }),
    ]),
  ];
}

const calcName = (no: string): HTMLElement =>
  el("span", { className: "b01-dashboard__calc-name", text: `${no} · ${LABELS.get(no) ?? ""}` });

function grid(
  groups: CalcSiteGroup[],
  draft: Record<string, CalcSiteValue>,
  changed: () => void,
): HTMLElement {
  const rows = groups.flatMap((group) => groupRows(group, draft, changed));
  const wrap = table([K("Col_Group"), K("Col_Browser"), K("Col_Server"), K("Col_Why")], rows, 14);
  const heads = new Set<number>();
  let at = 0;
  for (const group of groups) {
    heads.add(at);
    at += 1 + group.nos.length;
  }
  wrap.querySelectorAll("tbody tr").forEach((row, index) => {
    if (heads.has(index)) row.classList.add("b01-dashboard__calc-group");
  });
  return wrap;
}

/** 시스템 설정 「계산 자리」 카드 — 판을 받아 창을 엶. */
export async function openCalcSitesDialog(): Promise<void> {
  let board: CalcSitesBoard;
  try {
    board = await fetchCalcSites();
  } catch (error) {
    showToast(error instanceof Error ? error.message : K("LoadFailed"), "error");
    return;
  }
  const draft = { ...board.sites };
  const dirty = (): Record<string, CalcSiteValue> =>
    Object.fromEntries(Object.entries(draft).filter(([key, value]) => board.sites[key] !== value));
  const count = el("p", { className: "b01-dashboard__calc-count" });
  const recount = (): void => {
    const n = Object.values(draft).filter((value) => value === "server").length;
    count.textContent = K("ServerCount").replace("{value}", String(n));
  };
  recount();

  const save = async (): Promise<boolean> => {
    const changes = dirty();
    if (!Object.keys(changes).length) return true;
    try {
      board = await saveCalcSites(changes);
    } catch (error) {
      showToast(error instanceof Error ? error.message : String(error), "error");
      return false;
    }
    showToast(K("Saved"), "success");
    return true;
  };
  const saveButton = createButton({
    label: L("Common_Btn_Save"),
    variant: "filled",
    onClick: () => void save().then((ok) => ok && modal.close()),
  });
  const modal = openModal({
    title: K("Title"),
    closeLabel: L("Common_Btn_Close"),
    dialogClass: "b01-dashboard__calc-sites",
    wide: true,
    actions: [saveButton],
    beforeClose: async () => {
      if (!Object.keys(dirty()).length) return true;
      const choice = await askLeave(K("Leave"));
      return choice === "discard" || (choice === "save" && (await save()));
    },
    mount: (body) => {
      body.append(
        count,
        el("p", { className: "b01-dashboard__calc-note", text: K("NextOpen") }),
        grid(board.groups, draft, recount),
      );
    },
  });
}