import { redirect } from "next/navigation";
import { isStaff } from "@/lib/admin/is-staff";
import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
import { clientIp, rateLimit } from "@/lib/rate-limit";

export { isStaff };

export interface StaffUser {
  id: number;
  rank: number;
  username: string;
}

/**
 * Gate for admin pages and actions: redirects to /login when unauthenticated
 * and to / when authenticated but not staff. Returns the staff user otherwise.
 */
export async function requireStaff(): Promise<StaffUser> {
  const { session, permissions } = await getAdminContext();
  if (!canAccess(permissions, PERMS.ADMIN_DASHBOARD, session.user.rank)) redirect("/");
  return { id: session.user.id, rank: session.user.rank, username: session.user.username };
}

/**
 * Like requireStaff but also rate-limits the action per staff user (30 requests
 * per minute). Use on sensitive admin actions (ban, rank-change, settings edit).
 */
export async function requireStaffRateLimited(): Promise<StaffUser> {
  const staff = await requireStaff();
  const ip = await clientIp();
  if (!(await rateLimit(`admin:${staff.id}:${ip}`, 30, 60_000)).ok) redirect("/admin?error=ratelimit");
  return staff;
}