feat: recommend server-generated mixes from Musify and YouTube Music

Mixes are their own concept, not playlists: they live in their own Mixes/MixItems tables, cannot be edited and never show up among the user's playlists. Each item is either a Musify track or a YouTube Music reference, so YouTube songs stream directly instead of being downloaded. A daily Hangfire job seeds the mixes from the listening history: one discovery mix, one daily mix and one per top artist. The per-user YouTube filler query was already in the working tree and rides along here because it shares files with this change.
2026-07-21 18:13:07 +02:00
parent 2cb51f540e
commit 90e842d084
36 changed files with 2667 additions and 13 deletions
@@ -0,0 +1,37 @@
+using Mediator;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging;
+using Musify.Application.Contracts;
+using Musify.Application.Mixes;
+
+namespace Musify.Infrastructure.Jobs
+{
+    public class DailyMixGenerationJob(
+        IDatabase database,
+        IMediator mediator,
+        ILogger<DailyMixGenerationJob> logger)
+    {
+        public async Task RunAsync(CancellationToken cancellationToken)
+        {
+            var userIds = await database.ListeningHistories
+                .AsNoTracking()
+                .Select(history => history.UserId)
+                .Distinct()
+                .ToListAsync(cancellationToken);
+
+            logger.LogInformation("Starting daily mix generation for {Count} users", userIds.Count);
+
+            foreach (var userId in userIds)
+            {
+                var result = await mediator.Send(new GenerateMixesForUserCommand(userId), cancellationToken);
+                if (result.IsError)
+                {
+                    logger.LogWarning("Failed to generate mixes for user {UserId}: {Error}",
+                        userId, result.FirstError.Description);
+                }
+            }
+
+            logger.LogInformation("Finished daily mix generation");
+        }
+    }
+}