import { Logger } from "@smithy/types";

import { InstanceMetadataCredentials } from "../types";

const STATIC_STABILITY_REFRESH_INTERVAL_SECONDS = 5 * 60;
const STATIC_STABILITY_REFRESH_INTERVAL_JITTER_WINDOW_SECONDS = 5 * 60;
const STATIC_STABILITY_DOC_URL = "https://docs.aws.amazon.com/sdkref/latest/guide/feature-static-credentials.html";

/**
 * @internal
 */
export const getExtendedInstanceMetadataCredentials = (
  credentials: InstanceMetadataCredentials,
  logger: Logger
): InstanceMetadataCredentials => {
  const refreshInterval =
    STATIC_STABILITY_REFRESH_INTERVAL_SECONDS +
    Math.floor(Math.random() * STATIC_STABILITY_REFRESH_INTERVAL_JITTER_WINDOW_SECONDS);
  const newExpiration = new Date(Date.now() + refreshInterval * 1000);
  logger.warn(
    "Attempting credential expiration extension due to a credential service availability issue. A refresh of these " +
      "credentials will be attempted after ${new Date(newExpiration)}.\nFor more information, please visit: " +
      STATIC_STABILITY_DOC_URL
  );
  const originalExpiration = credentials.originalExpiration ?? credentials.expiration;
  return {
    ...credentials,
    ...(originalExpiration ? { originalExpiration } : {}),
    expiration: newExpiration,
  };
};