text: /**
   * Copyright 2021 The AMP HTML Authors. All Rights Reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS-IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  import {CountPagesAlgorithm} from './algorithm-count-pages';
  import {PredeterminedPositionAlgorithm} from './algorithm-predetermined';
  import {StoryAdPlacements} from '#experiments/story-ad-placements';
  import {getExperimentBranch} from '#experiments';
  
  /**
   * Choose placement algorithm implementation.
   * @param {!Window} win
   * @param {!StoryStoreService} storeService
   * @param {!StoryAdPageManager} pageManager
   * @return {!StoryAdPlacementAlgorithm}
   */
  export function getPlacementAlgo(win, storeService, pageManager) {
    const placementsExpBranch = getExperimentBranch(win, StoryAdPlacements.ID);
    if (
      placementsExpBranch &&
      placementsExpBranch !== StoryAdPlacements.CONTROL
    ) {
      return new PredeterminedPositionAlgorithm(
        storeService,
        pageManager,
        placementsExpBranch
      );
    }
    return new CountPagesAlgorithm(storeService, pageManager);
  }
  