/*
  Copyright 2019 Google LLC

  Use of this source code is governed by an MIT-style
  license that can be found in the LICENSE file or at
  https://opensource.org/licenses/MIT.
*/

import {FetchListenerOptions} from './addFetchListener.js';
import {getOrCreatePrecacheController} from './getOrCreatePrecacheController.js';
import {generateURLVariations} from './generateURLVariations.js';
import '../_version.js';

/**
 * This function will take the request URL and manipulate it based on the
 * configuration options.
 *
 * @param {string} url
 * @param {Object} options
 * @return {string} Returns the URL in the cache that matches the request,
 * if possible.
 *
 * @private
 */
export const getCacheKeyForURL =
    (url: string, options: FetchListenerOptions): string | void => {
  const precacheController = getOrCreatePrecacheController();

  const urlsToCacheKeys = precacheController.getURLsToCacheKeys();
  for (const possibleURL of generateURLVariations(url, options)) {
    const possibleCacheKey = urlsToCacheKeys.get(possibleURL);
    if (possibleCacheKey) {
      return possibleCacheKey;
    }
  }
};