import {
  BadgeCheck,
  Building2,
  Key,
  KeyRound,
  LayoutDashboard,
  LogOut,
  Moon,
  NotebookTabs,
  ShieldHalf,
  Sun,
  Users,
} from "lucide-react";
import { useEffect, useState } from "react";
import { useAuth } from "react-oidc-context";
import { NavLink, Outlet, useNavigate } from "react-router-dom";
import { t } from "../../lib/i18n";
import LanguageSelector from "../common/LanguageSelector";
import RoleSwitcher from "./RoleSwitcher";

const navItems = [
  { label: "ui.admin.nav.overview", to: "/", icon: LayoutDashboard },
  {
    label: "ui.admin.nav.tenant_dashboard",
    to: "/dashboard",
    icon: ShieldHalf,
  },
  {
    label: "ui.admin.nav.tenants",
    to: "/tenants",
    icon: Building2,
  },
  { label: "ui.admin.nav.users", to: "/users", icon: Users },
  { label: "ui.admin.nav.api_keys", to: "/api-keys", icon: Key },
  { label: "ui.admin.nav.audit_logs", to: "/audit-logs", icon: NotebookTabs },
  { label: "ui.admin.nav.auth_guard", to: "/auth", icon: KeyRound },
];
function AppLayout() {
  const auth = useAuth();
  const navigate = useNavigate();
  const [theme, setTheme] = useState<"light" | "dark">(() => {
    const stored = window.localStorage.getItem("admin_theme");
    return stored === "dark" ? "dark" : "light";
  });

  const handleLogout = () => {
    if (
      window.confirm(t("msg.admin.logout_confirm", "로그아웃 하시겠습니까?"))
    ) {
      window.localStorage.removeItem("admin_session");
      auth.removeUser();
      navigate("/login");
    }
  };

  useEffect(() => {
    if (!auth.isLoading && !auth.isAuthenticated) {
      navigate("/login");
    }
  }, [auth.isLoading, auth.isAuthenticated, navigate]);

  useEffect(() => {
    const root = document.documentElement;
    root.classList.remove("light", "dark");
    if (theme === "light") {
      root.classList.add("light");
    } else {
      root.classList.add("dark");
    }
    window.localStorage.setItem("admin_theme", theme);
  }, [theme]);

  const toggleTheme = () => {
    setTheme((prev) => (prev === "light" ? "dark" : "light"));
  };

  if (auth.isLoading) {
    return (
      <div className="flex h-screen items-center justify-center bg-background">
        <div className="h-8 w-8 border-4 border-primary/30 border-t-primary rounded-full animate-spin" />
      </div>
    );
  }

  return (
    <div className="grid min-h-screen bg-background text-foreground md:grid-cols-[240px,1fr]">
      <aside className="border-b border-border bg-card md:sticky md:top-0 md:h-screen md:border-b-0 md:border-r md:bg-card md:backdrop-blur">
        <div className="flex items-center justify-between px-5 py-4 md:block md:space-y-6 md:py-6">
          <div className="flex items-center gap-3 md:flex-col md:items-start">
            <div className="grid h-11 w-11 place-items-center rounded-xl bg-primary/15 text-primary shadow-[0_12px_30px_rgba(54,211,153,0.22)]">
              <ShieldHalf size={20} />
            </div>
            <div>
              <p className="text-xs uppercase tracking-[0.18em] text-muted-foreground">
                {t("ui.admin.brand", "Baron 로그인")}
              </p>
              <h1 className="text-lg font-semibold">
                {t("ui.admin.title", "Admin Control")}
              </h1>
            </div>
          </div>
          <div className="hidden rounded-full border border-border px-3 py-2 text-xs text-muted-foreground md:inline-flex md:items-center md:gap-2">
            <BadgeCheck size={14} />
            {t("msg.admin.scope_admin", "Scoped to /admin")}
          </div>
        </div>
        <nav className="px-2 pb-4 md:px-3 md:pb-8">
          <div className="flex flex-wrap gap-2 px-3 pb-4 text-[11px] text-muted-foreground md:flex-col md:items-start">
            <span className="rounded-full border border-border px-3 py-1">
              {t("msg.admin.idp_env_prod", "IDP env: prod")}
            </span>
            <span className="rounded-full border border-border px-3 py-1">
              {t("msg.admin.tenant_headers", "Tenant-aware headers")}
            </span>
          </div>
          <div className="flex flex-col gap-1">
            {navItems.map(({ label, to, icon: Icon }) => (
              <NavLink
                key={to}
                to={to}
                className={({ isActive }) =>
                  [
                    "flex items-center gap-3 rounded-xl px-3 py-3 text-sm transition",
                    isActive
                      ? "bg-primary/10 text-primary shadow-[0_12px_40px_rgba(54,211,153,0.18)]"
                      : "text-muted-foreground hover:bg-muted/10 hover:text-foreground",
                  ].join(" ")
                }
              >
                <Icon size={18} />
                <span>{t(label, label)}</span>
              </NavLink>
            ))}
          </div>

          <div className="px-3 pt-4 border-t border-border/50">
            <button
              type="button"
              onClick={handleLogout}
              className="w-full flex items-center gap-3 rounded-xl px-3 py-3 text-sm transition text-muted-foreground hover:bg-destructive/10 hover:text-destructive"
            >
              <LogOut size={18} />
              <span>{t("ui.admin.nav.logout", "Logout")}</span>
            </button>
          </div>
        </nav>
        <div className="hidden space-y-2 px-5 pb-6 text-xs text-[var(--color-muted)] md:block">
          <p>
            {t(
              "msg.admin.notice.scope",
              "관리 기능은 /admin 네임스페이스에서만 노출합니다.",
            )}
          </p>
          <p>
            {t(
              "msg.admin.notice.idp_policy",
              "IDP 관리 키는 서버 내부 래핑 API로만 사용하며, 감사·레이트리밋을 기본 적용합니다.",
            )}
          </p>
        </div>
      </aside>

      <div className="relative">
        <header className="sticky top-0 z-20 border-b border-border bg-background/90 backdrop-blur">
          <div className="flex items-center justify-between px-5 py-4 md:px-8">
            <div className="flex flex-col gap-1">
              <p className="text-xs uppercase tracking-[0.22em] text-muted-foreground">
                {t("ui.admin.header.plane", "Admin Plane")}
              </p>
              <span className="text-lg font-semibold">
                {t(
                  "msg.admin.header.subtitle",
                  "Tenant isolation & least privilege by default",
                )}
              </span>
            </div>
            <div className="flex items-center gap-2 text-sm">
              <LanguageSelector />
              <button
                type="button"
                onClick={toggleTheme}
                className="inline-flex items-center gap-2 rounded-full border border-border px-3 py-2 text-muted-foreground transition hover:bg-muted/20"
                aria-label={t("ui.common.theme_toggle", "테마 전환")}
              >
                {theme === "light" ? <Sun size={16} /> : <Moon size={16} />}
                {theme === "light"
                  ? t("ui.common.theme_light", "Light")
                  : t("ui.common.theme_dark", "Dark")}
              </button>
              <span className="rounded-full border border-border px-3 py-2 text-muted-foreground">
                {t("msg.admin.session_ttl", "Session TTL: 15m admin")}
              </span>
            </div>
          </div>
        </header>
        <main className="px-5 py-6 md:px-10 md:py-10">
          <Outlet />
        </main>
        <RoleSwitcher />
      </div>
    </div>
  );
}

export default AppLayout;
