import {
  BadgeCheck,
  Building2,
  Key,
  KeyRound,
  LayoutDashboard,
  Moon,
  NotebookTabs,
  ShieldHalf,
  Sun,
  Users,
} from "lucide-react";
import { useEffect, useState } from "react";
import { NavLink, Outlet } from "react-router-dom";
import RoleSwitcher from "./RoleSwitcher";

const navItems = [
  { label: "Overview", to: "/", icon: LayoutDashboard },
  { label: "Tenant Dashboard", to: "/dashboard", icon: ShieldHalf },
  { label: "Tenants", to: "/tenants", icon: Building2 },
  { label: "Users", to: "/users", icon: Users },
  { label: "API Keys (M2M)", to: "/api-keys", icon: Key },
  { label: "Audit Logs", to: "/audit-logs", icon: NotebookTabs },
  { label: "Auth Guard", to: "/auth", icon: KeyRound },
];

function AppLayout() {
  const [theme, setTheme] = useState<"light" | "dark">(() => {
    const stored = window.localStorage.getItem("admin_theme");
    return stored === "dark" ? "dark" : "light";
  });

  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"));
  };

  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">
                Baron 통합로그인
              </p>
              <h1 className="text-lg font-semibold">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} />
            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">
              IDP env: prod
            </span>
            <span className="rounded-full border border-border px-3 py-1">
              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>{label}</span>
              </NavLink>
            ))}
          </div>
        </nav>
        <div className="hidden space-y-2 px-5 pb-6 text-xs text-[var(--color-muted)] md:block">
          <p>관리 기능은 /admin 네임스페이스에서만 노출합니다.</p>
          <p>
            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">
                Admin Plane
              </p>
              <span className="text-lg font-semibold">
                Tenant isolation & least privilege by default
              </span>
            </div>
            <div className="flex items-center gap-2 text-sm">
              <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="테마 전환"
              >
                {theme === "light" ? <Sun size={16} /> : <Moon size={16} />}
                {theme === "light" ? "Light" : "Dark"}
              </button>
              <span className="rounded-full border border-border px-3 py-2 text-muted-foreground">
                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;