public async IAsyncEnumerable <ReleaseMessage> CheckSubscriptions()
{
IAsyncEnumerable <DiscordChannel> channels = subscriptionService.GetAllChannels().Where(channel => !channel.Ignore);
await foreach (DiscordChannel channel in channels)
{
IEnumerable <(IEnumerable <string> newReleases, SubscribedArtist currentArtist)> results = await Task.WhenAll(channel.SubscribedArtists.Select(async savedArtist =>
{
SubscribedArtist currentArtist = await musicInfoService.RetrieveSubscribedArtist(savedArtist.Id);
IEnumerable <string> savedReleases = savedArtist.Albums;
IEnumerable <string> currentReleases = currentArtist.Albums;
return(currentReleases.Except(savedReleases), currentArtist);
}));
IEnumerable <(IEnumerable <string> newReleases, SubscribedArtist currentArtist)> artistsWithNewReleases = results.Where(artist => artist.newReleases.Any());
DiscordChannel updatedChannel = artistsWithNewReleases
.Aggregate(channel, (currentChannel, artist) => currentChannel.WithUpdatedSubscribedArtist(artist.currentArtist));
await subscriptionService.UpdateChannel(updatedChannel);
foreach ((IEnumerable <string> newReleases, SubscribedArtist currentArtist) in artistsWithNewReleases)
{
yield return(new ReleaseMessage(
releases: await Task.WhenAll(newReleases.Select(newRelease => musicInfoService.GetReleaseById(newRelease))),
artistName: currentArtist.Name,
guildId: Convert.ToUInt64(updatedChannel.GuildId),
channnelId: Convert.ToUInt64(updatedChannel.Id)));
}
}
}
public async Task <SubscribedArtist?> SelectArtistToSubscribeTo(ulong channelId, int selection)
{
DiscordChannel?channel = await subscriptionService.GetChannel(channelId);
if (channel?.Ignore ?? false)
{
return(null);
}
string?artistId = channel?.CurrentArtistOptions?[selection];
if (artistId is null)
{
return(null);
}
SubscribedArtist newArtist = await musicInfoService.RetrieveSubscribedArtist(artistId);
if (channel is null)
{
return(null);
}
DiscordChannel updatedChannel = channel.WithSubscribedArtistAdded(newArtist);
DiscordChannel channelWithoutCurrent = updatedChannel.WithNewCurrentArtistOptions(new Dictionary <int, string>());
await subscriptionService.UpdateChannel(channelWithoutCurrent);
return(newArtist);
}
