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using System;
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using System.Linq;
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using System.Text.Json;
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using System.Threading.Tasks;
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using System.Data.SqlTypes;
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using Microsoft.AspNetCore.SignalR;
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using Microsoft.EntityFrameworkCore;
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using SpotifyAPI.Web;
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using StackExchange.Redis;
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using Selector.Cache;
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using Selector.Model;
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namespace Selector.Web.Hubs
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{
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public interface INowPlayingHubClient
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{
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public Task OnNewPlaying(CurrentlyPlayingDTO context);
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public Task OnNewAudioFeature(TrackAudioFeatures features);
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public Task OnNewPlayCount(PlayCount playCount);
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}
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public class NowPlayingHub: Hub<INowPlayingHubClient>
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{
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private readonly IDatabaseAsync Cache;
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private readonly AudioFeaturePuller AudioFeaturePuller;
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private readonly PlayCountPuller PlayCountPuller;
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private readonly ApplicationDbContext Db;
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public NowPlayingHub(
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IDatabaseAsync cache,
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AudioFeaturePuller featurePuller,
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ApplicationDbContext db,
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PlayCountPuller playCountPuller = null
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)
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{
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Cache = cache;
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AudioFeaturePuller = featurePuller;
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PlayCountPuller = playCountPuller;
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Db = db;
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}
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public async Task OnConnected()
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{
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await SendNewPlaying();
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}
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public async Task SendNewPlaying()
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{
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var nowPlaying = await Cache.StringGetAsync(Key.CurrentlyPlaying(Context.UserIdentifier));
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if (nowPlaying != RedisValue.Null)
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{
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var deserialised = JsonSerializer.Deserialize<CurrentlyPlayingDTO>(nowPlaying);
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await Clients.Caller.OnNewPlaying(deserialised);
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}
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}
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public async Task SendAudioFeatures(string trackId)
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{
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var user = Db.Users
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.AsNoTracking()
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.Where(u => u.Id == Context.UserIdentifier)
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.SingleOrDefault()
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?? throw new SqlNullValueException("No user returned");
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var watcher = Db.Watcher
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.AsNoTracking()
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.Where(w => w.UserId == Context.UserIdentifier
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&& w.Type == WatcherType.Player)
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.SingleOrDefault()
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?? throw new SqlNullValueException($"No player watcher found for [{user.UserName}]");
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var feature = await AudioFeaturePuller.Get(user.SpotifyRefreshToken, trackId);
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if (feature is not null)
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{
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await Clients.Caller.OnNewAudioFeature(feature);
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}
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}
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public async Task SendPlayCount(string track, string artist, string album, string albumArtist)
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{
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if(PlayCountPuller is not null)
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{
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var user = Db.Users
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.AsNoTracking()
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.Where(u => u.Id == Context.UserIdentifier)
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.SingleOrDefault()
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?? throw new SqlNullValueException("No user returned");
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if(!string.IsNullOrWhiteSpace(user.LastFmUsername))
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{
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var playCount = await PlayCountPuller.Get(user.LastFmUsername, track, artist, album, albumArtist);
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if (playCount is not null)
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{
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await Clients.Caller.OnNewPlayCount(playCount);
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}
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}
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}
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}
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}
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}
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