// ToDo: Change to "fs/promises" when supporting nodejs>=14
import { promises as fsPromises } from "fs";

import { getSSOTokenFilepath } from "./getSSOTokenFilepath";

const { readFile } = fsPromises;

/**
 * Cached SSO token retrieved from SSO login flow.
 */
export interface SSOToken {
  /**
   * A base64 encoded string returned by the sso-oidc service.
   */
  accessToken: string;

  /**
   * The expiration time of the accessToken as an RFC 3339 formatted timestamp.
   */
  expiresAt: string;

  /**
   * The token used to obtain an access token in the event that the accessToken is invalid or expired.
   */
  refreshToken?: string;

  /**
   * The unique identifier string for each client. The client ID generated when performing the registration
   * portion of the OIDC authorization flow. This is used to refresh the accessToken.
   */
  clientId?: string;

  /**
   * A secret string generated when performing the registration portion of the OIDC authorization flow.
   * This is used to refresh the accessToken.
   */
  clientSecret?: string;

  /**
   * The expiration time of the client registration (clientId and clientSecret) as an RFC 3339 formatted timestamp.
   */
  registrationExpiresAt?: string;

  /**
   * The configured sso_region for the profile that credentials are being resolved for.
   */
  region?: string;

  /**
   * The configured sso_start_url for the profile that credentials are being resolved for.
   */
  startUrl?: string;
}

/**
 * @param id - can be either a start URL or the SSO session name.
 * Returns the SSO token from the file system.
 */
export const getSSOTokenFromFile = async (id: string) => {
  const ssoTokenFilepath = getSSOTokenFilepath(id);
  const ssoTokenText = await readFile(ssoTokenFilepath, "utf8");
  return JSON.parse(ssoTokenText) as SSOToken;
};