import * as jwt from 'jsonwebtoken';

export function isTokenExpired(token: string, threshold: number = 300) {
  try {
    const decoded = jwt.decode(token);

    if (!decoded || typeof decoded === 'string' || !decoded.exp) {
      throw new Error("Invalid token or missing 'exp' field.");
    }

    const currentTime = Math.floor(Date.now() / 1_000);
    const tokenExpirationTime = decoded.exp;

    return tokenExpirationTime < currentTime + threshold;
  } catch {
    return true;
  }
}