/**
 * Copyright 2015 CANAL+ Group
 *
 * 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 type { IMediaElement } from "../../compat/browser_compatibility_types";
import shouldUnsetMediaKeys from "../../compat/should_unset_media_keys";
import log from "../../log";
import disposeDecryptionResources from "./dispose_decryption_resources";
import MediaKeysAttacher from "./utils/media_keys_attacher";

/**
 * Clear DRM-related resources that should be cleared when the current content
 * stops its playback.
 * @param {HTMLMediaElement} mediaElement
 * @returns {Promise}
 */
export default async function clearOnStop(mediaElement: IMediaElement): Promise<unknown> {
  log.info("DRM", "Clearing-up DRM session.");
  if (shouldUnsetMediaKeys()) {
    log.info("DRM", "disposing current MediaKeys.");
    return disposeDecryptionResources(mediaElement);
  }

  const currentState = await MediaKeysAttacher.getAttachedMediaKeysState(mediaElement);
  if (
    currentState !== null &&
    currentState.keySystemOptions.closeSessionsOnStop === true
  ) {
    log.info("DRM", "closing all current sessions.");
    return currentState.loadedSessionsStore.closeAllSessions();
  }
  log.info("DRM", "Nothing to clear. Returning right away.", {
    noState: currentState === null,
  });
  return Promise.resolve();
}