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/**
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 * Licensed to the Apache Software Foundation (ASF) under one
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 * or more contributor license agreements.  See the NOTICE file
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 * distributed with this work for additional information
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 * regarding copyright ownership.  The ASF licenses this file
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 * to you under the Apache License, Version 2.0 (the
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 * "License"); you may not use this file except in compliance
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 * with the License.  You may obtain a copy of the License at
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 *
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 *   http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing,
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 * software distributed under the License is distributed on an
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 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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 * KIND, either express or implied.  See the License for the
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 * specific language governing permissions and limitations
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 * under the License.
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 */
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import jwt_decode from "jwt-decode";
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export const REFRESH_TIMING_BUFFER_MS = 5000 // refresh guest token early to avoid failed superset requests
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export const MIN_REFRESH_WAIT_MS = 10000 // avoid blasting requests as fast as the cpu can handle
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export const DEFAULT_TOKEN_EXP_MS = 300000 // (5 min) used only when parsing guest token exp fails
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// when do we refresh the guest token?
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export function getGuestTokenRefreshTiming(currentGuestToken: string) {
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  const parsedJwt = jwt_decode<Record<string, any>>(currentGuestToken);
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  // if exp is int, it is in seconds, but Date() takes milliseconds
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  const exp = new Date(/[^0-9\.]/g.test(parsedJwt.exp) ? parsedJwt.exp : parseFloat(parsedJwt.exp) * 1000);
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  const isValidDate = exp.toString() !== 'Invalid Date';
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  const ttl = isValidDate ? Math.max(MIN_REFRESH_WAIT_MS, exp.getTime() - Date.now()) : DEFAULT_TOKEN_EXP_MS;
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  return ttl - REFRESH_TIMING_BUFFER_MS;
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}
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