"use client";

import { usePathname } from "next/navigation";
import { useEffect, useState, type ReactNode } from "react";
import { authFetch, getApiBase, getToken } from "../lib/auth";
import { canAccess, featureForPath, type FeatureAccess } from "../lib/features";

export function useFeatureUser() {
  const pathname = usePathname();
  const [state, setState] = useState<{
    path: string;
    user: { role?: string; features?: FeatureAccess; invite_management_enabled?: boolean } | null;
  }>({ path: "", user: null });
  useEffect(() => {
    let active = true;
    const load = async () => {
      if (!getToken()) {
        if (active) setState({ path: pathname, user: null });
        return;
      }
      try {
        const response = await authFetch(`${getApiBase()}/auth/me`);
        const user = response.ok ? await response.json() : null;
        if (active) setState({ path: pathname, user });
      } catch {
        if (active) setState({ path: pathname, user: null });
      }
    };
    void load();
    window.addEventListener("focus", load);
    return () => {
      active = false;
      window.removeEventListener("focus", load);
    };
  }, [pathname]);
  return { user: state.user, ready: state.path === pathname };
}

export default function FeatureGate({ children }: { children: ReactNode }) {
  const pathname = usePathname();
  const { user, ready } = useFeatureUser();
  const feature = featureForPath(pathname);
  if (!feature) return children;
  if (!ready) return <main className="card">Loading account access...</main>;
  if (!getToken()) return children;
  if (!canAccess(user, feature))
    return (
      <main className="card">
        <h1>Feature unavailable</h1>
        <p>Your account does not have access to this feature. Ask an administrator if you need it enabled.</p>
        <a href="/profile">Go to my profile</a>
      </main>
    );
  return children;
}