import "server-only";
import { cache } from "react";
import { cookies } from "next/headers";
import { redirect } from "next/navigation";
import { sessionFromToken } from "./auth-service";
import { SESSION_COOKIE, authDestination } from "./auth-policy";

// React cache scopes this result to one render, never across users or requests.
export const getSession = cache(async () => {
  const token = (await cookies()).get(SESSION_COOKIE)?.value;
  return token ? sessionFromToken(token) : null;
});

export async function requireUser() {
  const session = await getSession();
  const destination = authDestination(session);
  if (destination !== "/") redirect(destination);
  return session!;
}