Mixonomer.NET/Mixonomer/Playlist/PlaylistGenerator.cs

185 lines
6.5 KiB
C#
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using Google.Cloud.Firestore;
using Microsoft.Extensions.Logging;
using Mixonomer.Exceptions;
using Mixonomer.Extensions;
using Mixonomer.Fire;
using Mixonomer.Fire.Extensions;
using Mixonomer.Playlist.Sort;
using SpotifyAPI.Web;
namespace Mixonomer.Playlist;
public class PlaylistGenerator
{
private readonly ILogger<PlaylistGenerator> _logger;
protected readonly UserRepo _userRepo;
private readonly SpotifyNetworkProvider _spotifyMetworkProvider;
protected readonly PartTreeWalker _partTreeWalker;
public PlaylistGenerator(UserRepo userRepo, SpotifyNetworkProvider spotifyMetworkProvider, PartTreeWalker partTreeWalker, ILogger<PlaylistGenerator> logger)
{
_userRepo = userRepo;
_spotifyMetworkProvider = spotifyMetworkProvider;
_logger = logger;
_partTreeWalker = partTreeWalker;
}
public async Task GeneratePlaylist(string playlistName, string username)
{
using var logScope = _logger.BeginScope(new Dictionary<string, string> { {"username", username}, {"playlist", playlistName} });
ArgumentException.ThrowIfNullOrWhiteSpace(username);
var user = await _userRepo.GetUser(username);
var dbPlaylist = await _userRepo.GetPlaylists(user).FirstOrDefaultAsync(x => x.name == playlistName);
if (dbPlaylist is null)
{
_logger.LogError("Couldn't find playlist in database");
throw new PlaylistNotFoundException();
}
var spotifyClient = new SpotifyClient(await _spotifyMetworkProvider.GetUserConfig(user));
var userPlaylists = await spotifyClient.Playlists.CurrentUsers();
var allPlaylists = await spotifyClient.PaginateAll(userPlaylists);
var parts = await GetFullPartList(user, dbPlaylist);
var partPlaylists = GetPartPlaylists(dbPlaylist, allPlaylists, parts);
var context = new PlaylistGeneratingContext
{
PartTracks = await GetPlaylistTracks(spotifyClient, partPlaylists).ToListAsync(),
LibraryTracks = await GetLibraryTracks(spotifyClient, dbPlaylist).ToListAsync()
};
context = DoPlaylistTypeProcessing(context, user, dbPlaylist);
var combinedTracks = CollapseContextToCommonTracks(context);
var recommender = new SpotifyRecommender(spotifyClient);
var recommendations = await recommender.GetRecommendations(dbPlaylist, combinedTracks);
combinedTracks = combinedTracks.Concat(recommendations);
// combinedTracks = combinedTracks.DistinctBy(x => (x.TrackName, string.Join(':', x.ArtistNames.Order())));
// combinedTracks = combinedTracks.DistinctBy(x => x.TrackUri);
combinedTracks = combinedTracks.DistinctBy(x => (x.TrackName.ToLower(), string.Concat(x.ArtistNames.Order())));
combinedTracks = SortTracks(combinedTracks, dbPlaylist);
await ExecutePlaylist(spotifyClient, dbPlaylist, user, combinedTracks, parts);
await dbPlaylist.Reference.SetAsync(new
{
last_updated = DateTime.UtcNow
}, SetOptions.MergeAll);
}
private async Task<IEnumerable<string>> GetFullPartList(User user, Fire.Playlist playlist)
{
var parts = (await _partTreeWalker.GetPlaylistParts(user, playlist.name) ?? Enumerable.Empty<string>()).ToList();
if (playlist.add_last_month)
{
parts.Add(Months.LastMonth());
}
if (playlist.add_this_month)
{
parts.Add(Months.ThisMonth());
}
if (parts.Count == 0)
{
_logger.LogInformation("No spotify playlist parts found");
}
return parts;
}
private IEnumerable<FullPlaylist> GetPartPlaylists(Fire.Playlist subjectPlaylist, IEnumerable<FullPlaylist> allPlaylists, IEnumerable<string> parts)
{
foreach (var playlist in allPlaylists)
{
foreach (var part in parts)
{
if (playlist.Name?.Equals(part, StringComparison.Ordinal) ?? false)
{
if (!subjectPlaylist.include_spotify_owned &&
(playlist.Owner?.DisplayName.Contains("spotify", StringComparison.InvariantCultureIgnoreCase) ??
false))
{
// skip
}
else
{
yield return playlist;
}
}
}
}
}
private async IAsyncEnumerable<PlaylistTrack<IPlayableItem>> GetPlaylistTracks(SpotifyClient client, IEnumerable<FullPlaylist> playlists)
{
foreach (var playlist in playlists)
{
if (playlist.Tracks is { } tracks)
{
foreach (var track in await client.PaginateAll(await client.Playlists.GetItems(playlist.Id)))
{
yield return track;
}
}
}
}
private async IAsyncEnumerable<SavedTrack> GetLibraryTracks(SpotifyClient client, Fire.Playlist playlist)
{
if (playlist.include_library_tracks)
{
await foreach(var track in client.Paginate(await client.Library.GetTracks()))
{
yield return track;
}
}
}
protected virtual PlaylistGeneratingContext DoPlaylistTypeProcessing(PlaylistGeneratingContext context, User user, Fire.Playlist playlist)
{
return context;
}
protected virtual IEnumerable<CommonTrack> CollapseContextToCommonTracks(PlaylistGeneratingContext context) =>
context.ToCommonTracks();
protected virtual IEnumerable<CommonTrack> SortTracks(IEnumerable<CommonTrack> tracks, Fire.Playlist playlist)
{
if (playlist.shuffle)
{
return tracks.Shuffle();
}
else
{
return tracks.OrderByReleaseDate();
}
}
protected virtual async Task ExecutePlaylist(SpotifyClient client, Fire.Playlist playlist, User user, IEnumerable<CommonTrack> tracks, IEnumerable<string> partList)
{
var chunks = tracks.Select(x => x.TrackUri).Chunk(100);
var playlistId = playlist.uri.UriToId();
if (chunks.FirstOrDefault() is { } chunk)
{
await client.Playlists.ReplaceItems(playlist.uri.UriToId(),
new PlaylistReplaceItemsRequest(chunk.ToList()));
}
foreach (var remainingChunk in chunks.Skip(1))
{
await client.Playlists.AddItems(playlistId, new PlaylistAddItemsRequest(remainingChunk));
}
}
}