/* =============================================================================
 * B01_Dashboard_UI_Shell.ts
 * 대시보드 셸(546) — 위 머리 48 + 왼쪽 메뉴 210 + 세부 페이지 자리 + 오른쪽 아래 챗봇 단추.
 *   머리 = AISLO · 회사 이름(시스템 관리자 = 눌러 회사 전환) · 찾기(자리만) · [?] · 알림 · 사용자 메뉴
 *   페이지 = 등록부(`B01_Dashboard_UI_Views.ts`) · 주소 `?view=` 가 바뀌면 셸은 두고 페이지만 갈아 끼움
 *   (라우터 MountedPage — 같은 주소 안 이동 = show) · 옛 ☰ 서랍 · 구역 접기 없음
 * ========================================================================== */

import { LANG_STORAGE_KEY, ROUTES, THEME_STORAGE_KEY } from "@config/config_frontend";
import { createHelpButton } from "@ui/ui_template_help";
import { icon, type IconName } from "@ui/ui_template_icons";
import { currentLanguageIndex, setLanguage } from "@ui/ui_template_locale";
import { readTouchMode, setTouchMode, type TouchMode } from "../A00_Common/device_context";
import { currentQuery, navigateTo, type MountedPage } from "../A00_Common/router";
import {
  fetchAllCompanies,
  fetchCompanyJoinRequests,
  type CompanyInfo,
  type DashboardUser,
} from "./B01_Dashboard_Api_Fetch";
import { fetchTempBatches } from "./B01_Dashboard_Api_Temp";
import { fetchAssignedPlans } from "./B01_Dashboard_UI_AssignedPlans";
import { roleLabel } from "./B01_Dashboard_UI_Common";
import { openCompanyPicker } from "./B01_Dashboard_UI_CompanyPick";
import { buildKnowledgeChat } from "./B01_Dashboard_UI_Knowledge_Chat";
import { ADMIN_COMPANY_KEY, pickAdminCompany } from "./B01_Dashboard_UI_Legacy";
import { buildNav, viewHref, type DashboardNav } from "./B01_Dashboard_UI_Nav";
import { roleOf, viewFor, VIEWS, type ViewCtx } from "./B01_Dashboard_UI_Views";
import "./B01_Dashboard_UI_Style_Shell.css";

function iconButton(name: IconName, label: string, onClick?: () => void): HTMLButtonElement {
  const b = document.createElement("button");
  b.type = "button";
  b.className = "b01-shell__icon-btn";
  b.title = b.ariaLabel = label;
  b.append(icon(name));
  if (onClick) b.addEventListener("click", onClick);
  else b.disabled = true;
  return b;
}

function menuItem(name: IconName, label: string, onClick: () => void): HTMLButtonElement {
  const b = document.createElement("button");
  b.type = "button";
  b.className = "b01-shell__menu-item";
  const text = document.createElement("span");
  text.textContent = label;
  b.append(icon(name, 16), text);
  b.addEventListener("click", onClick);
  return b;
}

function toggleTheme(): void {
  const next = document.documentElement.getAttribute("data-theme") === "dark" ? "light" : "dark";
  document.documentElement.setAttribute("data-theme", next);
  localStorage.setItem(THEME_STORAGE_KEY, next);
}

/** 로그아웃 — 옛 ☰ 와 같음(서버 로그아웃 → 이 브라우저 자료 지움 → 홈으로 새로고침) */
async function logoutNow(): Promise<void> {
  const { logout } = await import("../A06_Login/A06_Login_Api_Fetch");
  await logout().catch(() => undefined); // 세션이 이미 만료된 경우 등은 무시
  const { wipeAccountCache } = await import("../A00_Common/b_project_switch");
  await wipeAccountCache();
  history.replaceState(null, "", `#/${ROUTES.A01_HOME}`);
  window.location.reload();
}

/** 사용자 메뉴 — 이름 · 역할 · 내 정보 · 화면(밝음 · 어두움 · 언어 · 터치) · 설정 · 홈페이지 · 로그아웃 */
function buildUserMenu(ctx: ViewCtx, roleText: string): HTMLElement {
  const wrap = document.createElement("div");
  wrap.className = "b01-shell__user";
  const trigger = document.createElement("button");
  trigger.type = "button";
  trigger.className = "b01-shell__user-btn";
  trigger.setAttribute("aria-haspopup", "menu");
  trigger.setAttribute("aria-expanded", "false");
  const avatar = document.createElement("span");
  avatar.className = "b01-shell__avatar";
  avatar.textContent = (ctx.me.name?.trim() || ctx.me.email).slice(0, 1);
  const name = document.createElement("span");
  name.className = "b01-shell__user-name";
  name.textContent = ctx.me.name?.trim() || ctx.me.email;
  trigger.append(avatar, name, icon("chevronDown", 14));

  const menu = document.createElement("div");
  menu.className = "b01-shell__menu";
  menu.setAttribute("role", "menu");
  menu.hidden = true;
  const who = document.createElement("div");
  who.className = "b01-shell__menu-who";
  const strong = document.createElement("strong");
  strong.textContent = name.textContent;
  const sub = document.createElement("span");
  sub.textContent = `${roleText} · ${ctx.me.email}`;
  who.append(strong, sub);

  const touch = document.createElement("div");
  touch.className = "b01-shell__menu-touch";
  const touchLabel = document.createElement("span");
  touchLabel.textContent = "터치 모드";
  touch.append(icon("hand", 16), touchLabel);
  const modes: [TouchMode, string][] = [
    ["auto", "자동"],
    ["on", "켬"],
    ["off", "끔"],
  ];
  for (const [mode, label] of modes) {
    const b = document.createElement("button");
    b.type = "button";
    b.textContent = label;
    b.dataset.touchMode = mode;
    b.setAttribute("aria-pressed", String(readTouchMode() === mode));
    b.addEventListener("click", () => {
      setTouchMode(mode);
      for (const x of touch.querySelectorAll("button"))
        x.setAttribute("aria-pressed", String(x.dataset.touchMode === mode));
    });
    touch.append(b);
  }

  const setOpen = (open: boolean): void => {
    menu.hidden = !open;
    trigger.setAttribute("aria-expanded", String(open));
  };
  // 테마 줄 = 지금과 반대 화면 이름 · 바꾼 뒤 다시 씀
  const themeItem = (): HTMLButtonElement => {
    const dark = document.documentElement.getAttribute("data-theme") === "dark";
    return menuItem(dark ? "sun" : "moon", dark ? "밝은 화면" : "어두운 화면", () => {
      toggleTheme();
      theme.replaceWith((theme = themeItem()));
    });
  };
  let theme = themeItem();
  menu.append(
    who,
    menuItem("userCircle", "내 정보", () => ctx.go("me")),
    theme,
    menuItem("world", currentLanguageIndex === 0 ? "English" : "한국어", () => {
      const next = currentLanguageIndex === 0 ? "en" : "ko";
      setLanguage(next);
      localStorage.setItem(LANG_STORAGE_KEY, next);
      window.location.reload();
    }),
    touch,
    menuItem("adjustments", "설정(마우스 · 단축키)", () => {
      void import("../A00_Common/app_settings").then((m) => m.openAppSettings());
    }),
    menuItem("home", "홈페이지", () => navigateTo(ROUTES.A01_HOME)),
    menuItem("logout", "로그아웃", () => void logoutNow()),
  );
  // 고른 뒤 닫힘(터치 모드 단추는 그대로)
  menu.addEventListener("click", (e) => {
    if ((e.target as Element).closest(".b01-shell__menu-item")) setOpen(false);
  });
  trigger.addEventListener("click", () => setOpen(menu.hidden !== false));
  const outside = (e: MouseEvent): void => {
    if (!wrap.isConnected) document.removeEventListener("click", outside);
    else if (!wrap.contains(e.target as Node)) setOpen(false);
  };
  document.addEventListener("click", outside);
  wrap.addEventListener("keydown", (e) => e.key === "Escape" && setOpen(false));
  wrap.append(trigger, menu);
  return wrap;
}

/** 회사 이름 — 시스템 관리자는 눌러 회사 고르기(옛 회사 알약) · 고르면 지금 페이지를 그 회사 것으로 다시 그림 */
function buildCompany(
  ctx: ViewCtx,
  companies: CompanyInfo[],
  onPick: (id: number) => void,
): HTMLElement {
  const nameOf = (): string =>
    companies.find((c) => c.id === ctx.companyId)?.name ?? ctx.me.company_name ?? "-";
  if (ctx.role !== "SYSTEM_ADMIN") {
    const span = document.createElement("span");
    span.className = "b01-shell__org";
    span.textContent = ctx.me.company_name ?? "회사 없음";
    return span;
  }
  const b = document.createElement("button");
  b.type = "button";
  b.className = "b01-shell__org is-switch";
  b.title = "회사 전환";
  const label = document.createElement("span");
  label.textContent = nameOf();
  b.append(label, icon("chevronDown", 14));
  b.addEventListener("click", () =>
    openCompanyPicker(companies, ctx.companyId, (company) => {
      sessionStorage.setItem(ADMIN_COMPANY_KEY, String(company.id));
      onPick(company.id);
      label.textContent = nameOf();
    }),
  );
  return b;
}

/** 보관함 만료 임박 = 7 일 안 */
const EXPIRE_SOON_MS = 7 * 24 * 3600 * 1000;

/** 메뉴 배지 · 알림 수 — 가입 요청(회사 관리자 · 시스템 관리자) · 받은 예정노선 미연결 · 업데이트 ·
 *  보관함 묶음 수(만료 임박은 처리할 일) · 처리할 일 = 빨강 배지 합 · 실패한 것은 0 */
async function refreshBadges(ctx: ViewCtx, nav: DashboardNav, bell: HTMLElement): Promise<void> {
  const admin = ctx.role === "ADMIN" || ctx.role === "SYSTEM_ADMIN";
  const [joins, plans, temp] = await Promise.all([
    admin
      ? fetchCompanyJoinRequests(ctx.role === "SYSTEM_ADMIN" ? ctx.companyId : undefined).catch(
          () => [],
        )
      : [],
    ctx.role === "FOREST" ? [] : fetchAssignedPlans().catch(() => []),
    fetchTempBatches()
      .then((r) => r.batches)
      .catch(() => []),
  ]);
  const newPlans = plans.filter((p) => !p.linked_project_id || p.update_available).length;
  const now = Date.now();
  const expiring = temp.filter(
    (b) => b.expires_at && Date.parse(b.expires_at) - now < EXPIRE_SOON_MS,
  ).length;
  nav.setBadge("people", joins.length, true);
  nav.setBadge("assigned", newPlans, true);
  nav.setBadge("temp", temp.length);
  const todo = joins.length + newPlans + expiring;
  const badge = bell.querySelector<HTMLElement>(".b01-shell__badge")!;
  badge.hidden = todo <= 0;
  badge.textContent = String(todo);
  bell.title = bell.ariaLabel = `처리할 일 ${todo} 건`;
}

export async function mountDashboardShell(
  root: HTMLElement,
  me: DashboardUser,
  forest: boolean,
): Promise<MountedPage> {
  const role = roleOf(me, forest);
  const companies = role === "SYSTEM_ADMIN" ? await fetchAllCompanies().catch(() => []) : [];
  const ctx: ViewCtx = {
    me,
    role,
    companyId: role === "SYSTEM_ADMIN" ? pickAdminCompany(me, companies) : (me.company_id ?? null),
    go: (view, params = {}) => {
      window.location.hash = viewHref(view, params);
    },
  };
  const roleText = role === "FOREST" ? "산림청" : roleLabel(me.role);

  const shell = document.createElement("div");
  shell.className = "b01-shell b01-dashboard";

  const header = document.createElement("header");
  header.className = "b01-shell__head";
  const brand = document.createElement("a");
  brand.className = "b01-shell__brand";
  brand.href = viewHref("home");
  brand.textContent = "AISLO";
  const search = document.createElement("input");
  search.className = "b01-shell__search";
  search.type = "search";
  search.placeholder = "찾기 (준비 중)";
  search.disabled = true;
  const spacer = document.createElement("span");
  spacer.className = "b01-shell__spacer";
  const help = createHelpButton();
  help.classList.add("b01-shell__help-btn");
  // 알림 = 처리할 일 수 · 누르면 홈(처리할 일 목록 자리)
  const bell = iconButton("bell", "처리할 일", () => ctx.go("home"));
  const bellBadge = document.createElement("span");
  bellBadge.className = "b01-shell__badge is-alert";
  bellBadge.hidden = true;
  bell.append(bellBadge);
  header.append(
    brand,
    buildCompany(ctx, companies, (id) => {
      ctx.companyId = id;
      show();
    }),
    search,
    spacer,
    help,
    bell,
    buildUserMenu(ctx, roleText),
  );

  const visible = VIEWS.filter((v) => v.roles.includes(role));
  const nav = buildNav(visible);
  const main = document.createElement("main");
  main.className = "b01-shell__main";
  const body = document.createElement("div");
  body.className = "b01-shell__body";
  body.append(nav.root, main);
  shell.append(header, body, buildKnowledgeChat());
  root.append(shell);

  let cleanup: (() => void) | null = null;
  let seq = 0;
  /** 주소 `?view=` 페이지를 새 자리에 그림 — 옛 페이지 정리 · 늦게 끝난 옛 mount 의 정리도 부름 */
  const show = (): void => {
    cleanup?.();
    cleanup = null;
    const mine = ++seq;
    const view = viewFor(currentQuery().get("view"), role);
    nav.setActive(view.group === "hidden" && view.key === "project" ? "projects" : view.key);
    void refreshBadges(ctx, nav, bell);
    const host = document.createElement("div");
    host.className = "b01-shell__page";
    host.dataset.view = view.key;
    main.replaceChildren(host);
    void Promise.resolve(view.mount(host, ctx)).then((done) => {
      if (typeof done !== "function") return;
      if (mine === seq) cleanup = done;
      else done();
    });
  };
  show();

  return {
    covers: (route) => route === ROUTES.B01_ACCOUNT,
    show,
    dispose: () => {
      seq++;
      cleanup?.();
      cleanup = null;
    },
  };
}