public class SimpleExoPlayerViewHolder extends RecyclerView.ViewHolder implements ToroPlayer {

  static final int LAYOUT_RES = R.layout.vh_exoplayer_basic;

  @Nullable ExoPlayerViewHelper helper;
  @Nullable private Uri mediaUri;

  @BindView(R.id.player) PlayerView playerView;

  SimpleExoPlayerViewHolder(View itemView) {
    super(itemView);
    ButterKnife.bind(this, itemView);
  }

  // called from Adapter to setup the media
  void bind(@NonNull RecyclerView.Adapter adapter, Uri item, List<Object> payloads) {
    if (item != null) {
      mediaUri = item;
    }
  }

  @NonNull @Override public View getPlayerView() {
    return playerView;
  }

  @NonNull @Override public PlaybackInfo getCurrentPlaybackInfo() {
    return helper != null ? helper.getLatestPlaybackInfo() : new PlaybackInfo();
  }

  @Override
  public void initialize(@NonNull Container container, @Nullable PlaybackInfo playbackInfo) {
    if (helper == null) {
      helper = new ExoPlayerViewHelper(this, mediaUri);
    }
    helper.initialize(container, playbackInfo);
  }

  @Override public void release() {
    if (helper != null) {
      helper.release();
      helper = null;
    }
  }

  @Override public void play() {
    if (helper != null) helper.play();
  }

  @Override public void pause() {
    if (helper != null) helper.pause();
  }

  @Override public boolean isPlaying() {
    return helper != null && helper.isPlaying();
  }

  @Override public boolean wantsToPlay() {
    return ToroUtil.visibleAreaOffset(this, itemView.getParent()) >= 0.85;
  }

  @Override public int getPlayerOrder() {
    return getAdapterPosition();
  }
}