import type { IncomingHttpHeaders } from 'node:http';
import { fromNodeHeaders } from 'better-auth/node';

export interface SocketSessionResult {
  session: unknown;
  user: { id: string };
}

export interface SessionAuth {
  api: {
    getSession(context: { headers: Headers }): Promise<SocketSessionResult | null>;
  };
}

export async function validateSocketSession(
  headers: IncomingHttpHeaders,
  auth: SessionAuth,
): Promise<SocketSessionResult | null> {
  const sessionHeaders = fromNodeHeaders(headers);
  const result = await auth.api.getSession({ headers: sessionHeaders });

  if (!result) {
    return null;
  }

  return {
    session: result.session,
    user: { id: result.user.id },
  };
}