/**
 * 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 BROWSER_GLOBALS from "../../../../compat/browser_compatibility_types";
import isNullOrUndefined from "../../../../utils/is_null_or_undefined";

/**
 * Check if one of given video codecs are supported for decode.
 * These video codecs are chose for their wide proven compatibility and
 * popularity.
 * @returns {string}
 */
export function findDefaultVideoCodec(): string {
  const videoCodecs = [
    'video/mp4;codecs="avc1.4d401e"',
    'video/mp4;codecs="avc1.42e01e"',
    'video/mp4;codecs="hvc1.1.6.L93.B0"',
    'video/webm;codecs="vp8"',
  ];
  const { MediaSource_ } = BROWSER_GLOBALS;
  if (
    isNullOrUndefined(MediaSource_) ||
    typeof MediaSource_.isTypeSupported !== "function"
  ) {
    throw new Error("Cannot check video codec support: No API available.");
  }
  for (const codec of videoCodecs) {
    if (MediaSource_.isTypeSupported(codec)) {
      return codec;
    }
  }
  throw new Error("No default video codec found.");
}

/**
 * Check if one of given audio codecs are supported for decode.
 * These audio codecs are chose for their wide proven compatibility and
 * popularity.
 * @returns {string}
 */
export function findDefaultAudioCodec(): string {
  const audioCodecs = ['audio/mp4;codecs="mp4a.40.2"', 'audio/webm;codecs="opus"'];
  const { MediaSource_ } = BROWSER_GLOBALS;
  if (
    isNullOrUndefined(MediaSource_) ||
    typeof MediaSource_.isTypeSupported !== "function"
  ) {
    throw new Error("Cannot check audio codec support: No API available.");
  }
  for (const codec of audioCodecs) {
    if (MediaSource_.isTypeSupported(codec)) {
      return codec;
    }
  }
  throw new Error("No default audio codec found.");
}