public async Task <MetadataResult <Episode> > GetMetadata(EpisodeInfo info,
                                                                  CancellationToken cancellationToken)
        {
            _logger.LogInformation($"Douban:GetMetadata for episode {info.Name}");
            var result = new MetadataResult <Episode>();

            if (info.IsMissingEpisode)
            {
                _logger.LogInformation("Do not support MissingEpisode");
                return(result);
            }

            var sid = info.GetProviderId(ProviderID);

            if (string.IsNullOrEmpty(sid))
            {
                var searchResults = await SearchFrodoByName(info.Name, "tv",
                                                            cancellationToken).ConfigureAwait(false);

                sid = searchResults.FirstOrDefault()?.Id;
            }

            if (!info.IndexNumber.HasValue)
            {
                _logger.LogInformation("No episode num found, please check " +
                                       "the format of file name");
                return(result);
            }
            // Start to get information from douban
            result.Item = new Episode
            {
                Name              = info.Name,
                IndexNumber       = info.IndexNumber,
                ParentIndexNumber = info.ParentIndexNumber
            };
            result.Item.SetProviderId(ProviderID, sid);

            var url = string.Format("https://movie.douban.com/subject/{0}" +
                                    "/episode/{1}/", sid, info.IndexNumber);
            string content = await _doubanAccessor.GetResponseWithDelay(url, cancellationToken);

            string pattern_name = "data-name=\\\"(.*?)\\\"";
            Match  match        = Regex.Match(content, pattern_name);

            if (match.Success)
            {
                var name = HttpUtility.HtmlDecode(match.Groups[1].Value);
                _logger.LogDebug("The name is {0}", name);
                result.Item.Name = name;
            }

            string pattern_desc = "data-desc=\\\"(.*?)\\\"";

            match = Regex.Match(content, pattern_desc);
            if (match.Success)
            {
                var desc = HttpUtility.HtmlDecode(match.Groups[1].Value);
                _logger.LogDebug("The desc is {0}", desc);
                result.Item.Overview = desc;
            }
            result.HasMetadata = true;

            return(result);
        }