/**
 * `true` if we are running inside a web browser, `false` otherwise (e.g. running inside Node.js).
 */
export const isBrowser = typeof window !== 'undefined';

/**
 * This is a map which lists native support of formats and APIs.
 * It gets filled during runtime with the relevant values to the current environment.
 */
export const NativeEnvironmentSupport: { [format: string]: boolean } = {
  MSE: false,
  HLS: false,
  DASH: false,
  MP4: false,
  WEBM: false,
  OGG: false,
  MOV: false,
  MKV: false,
};

/* ignore coverage */
function detectEnvironment() {
  if (!isBrowser) {
    return; // Not in a browser
  }
  NativeEnvironmentSupport.MSE =
    'WebKitMediaSource' in window || 'MediaSource' in window;
  const video = document.createElement('video');
  if (typeof video.canPlayType !== 'function') {
    return; // env doesn't support HTMLMediaElement (e.g PhantomJS)
  }
  if (
    video.canPlayType('application/x-mpegURL') ||
    video.canPlayType('application/vnd.apple.mpegURL')
  ) {
    NativeEnvironmentSupport.HLS = true;
  }
  if (video.canPlayType('application/dash+xml')) {
    NativeEnvironmentSupport.DASH = true;
  }
  if (video.canPlayType('video/mp4')) {
    NativeEnvironmentSupport.MP4 = true;
  }
  if (video.canPlayType('video/webm')) {
    NativeEnvironmentSupport.WEBM = true;
  }
  if (video.canPlayType('video/ogg')) {
    NativeEnvironmentSupport.OGG = true;
  }
  if (video.canPlayType('video/quicktime')) {
    NativeEnvironmentSupport.MOV = true;
  }
  if (video.canPlayType('video/x-matroska')) {
    NativeEnvironmentSupport.MKV = true;
  }
}

detectEnvironment(); // Run once