public PodcastItemViewModel(SyndicationItem item)
        {
            OriginalUri = item.GetPodcastUris().First();
            DatePublished = item.PublishedDate;
            Title = item.Title.Text;

	        string summary = item.Summary.IfNotNull(its => its.Text);
            
            Summary = summary;
            Id = new PodcastId(this.GetStorageUrl());

            PlayPodcastCommand = ReactiveCommand.Create();
            PlayPodcastCommand.Subscribe(OnPlayPodcast);

            _cachingState = FileCache.Instance.CachedFiles.FirstOrDefaultAsync(x => x.Id == Id).Select(x => new CachingStateVm(x.State)).ToProperty(this, x => x.CachingState);
        }