import { headers } from 'next/headers';
import { auth } from '@/lib/auth';
import { asErrorMessage, jsonError } from '@/lib/server/http';

export type AuthenticatedSession = NonNullable<
  Awaited<ReturnType<typeof auth.api.getSession>>
>;

type RequiredSessionResult = (
  | {
    session: AuthenticatedSession;
    response: null;
  }
  | {
    session: null;
    response: Response;
  }
);

export async function getAuthenticatedSession() {
  const session = await auth.api.getSession({
    headers: await headers()
  });

  if (!session?.user?.id) {
    return null;
  }

  return session;
}

export async function requireAuthenticatedSession(): Promise<RequiredSessionResult> {
  try {
    const session = await getAuthenticatedSession();
    if (!session) {
      return {
        session: null,
        response: jsonError('Unauthorized', 401)
      };
    }

    return {
      session,
      response: null
    };
  } catch (error) {
    return {
      session: null,
      response: jsonError(asErrorMessage(error, 'Authentication subsystem is unavailable.'), 500)
    };
  }
}