Make Discover and upload genres dynamic

Discover used a hardcoded list of genre tiles that searched track titles,
and the upload form kept its own copy of the genre list and compatibility
rules. Both now come from the backend.

Backend:
- GET /genres returns genres with at least one track and their counts.
- GET /genres/available returns every assignable genre with the genres
  it cannot be combined with, so the rules live only in
  GenreCompatibility.
- GET /tracks accepts ?genre= (case-insensitive, 400 on unknown values).

web-player:
- Discover tiles are built from /genres; each opens /explore?genre=X, a
  song list filtered by that tag. Unknown genres fall back to a label
  derived from their name.
- The upload form loads /genres/available, disables incompatible genres
  as you pick, and the server validates before reserving upload URLs.
- lib/data/trackGenres.ts is removed; its helpers merge into
  lib/data/genres.ts.
- Regenerate the typed API client.

backend/Core/Musify.Application/Genres/GetAvailableGenres.cs

@@ -0,0 +1,26 @@
+using Mediator;
+using Musify.Domain.ValueObjects;
+
+namespace Musify.Application.Genres
+{
+    public record GetAvailableGenresQuery : IQuery<IReadOnlyList<AvailableGenreResponse>>;
+
+    public record AvailableGenreResponse(Genre Genre, IReadOnlyList<Genre> IncompatibleWith);
+
+    public class GetAvailableGenresQueryHandler
+        : IQueryHandler<GetAvailableGenresQuery, IReadOnlyList<AvailableGenreResponse>>
+    {
+        public ValueTask<IReadOnlyList<AvailableGenreResponse>> Handle(GetAvailableGenresQuery request, CancellationToken cancellationToken)
+        {
+            var all = Enum.GetValues<Genre>();
+
+            IReadOnlyList<AvailableGenreResponse> result = all
+                .Select(genre => new AvailableGenreResponse(
+                    genre,
+                    all.Where(other => !GenreCompatibility.AreCompatible(genre, other)).ToList()))
+                .ToList();
+
+            return ValueTask.FromResult(result);
+        }
+    }
+}

backend/Core/Musify.Application/Genres/GetGenres.cs

@@ -0,0 +1,31 @@
+using Mediator;
+using Microsoft.EntityFrameworkCore;
+using Musify.Application.Contracts;
+using Musify.Domain.ValueObjects;
+
+namespace Musify.Application.Genres
+{
+    public record GetGenresQuery : IQuery<IReadOnlyList<GenreResponse>>;
+
+    public record GenreResponse(Genre Genre, int TrackCount);
+
+    public class GetGenresQueryHandler(IDatabase database)
+        : IQueryHandler<GetGenresQuery, IReadOnlyList<GenreResponse>>
+    {
+        public async ValueTask<IReadOnlyList<GenreResponse>> Handle(GetGenresQuery request, CancellationToken cancellationToken)
+        {
+            var rows = await database.TrackTags
+                .AsNoTracking()
+                .Where(tag => database.UserHasTracks.Any(userTrack => userTrack.TrackId == tag.TrackId))
+                .GroupBy(tag => tag.Tag)
+                .Select(group => new { Genre = group.Key, TrackCount = group.Select(tag => tag.TrackId).Distinct().Count() })
+                .ToListAsync(cancellationToken);
+
+            return rows
+                .OrderByDescending(row => row.TrackCount)
+                .ThenBy(row => row.Genre)
+                .Select(row => new GenreResponse(row.Genre, row.TrackCount))
+                .ToList();
+        }
+    }
+}

backend/Core/Musify.Application/Tracks/GetTracks.cs

@@ -5,10 +5,11 @@ using Musify.Application.Tracks.Responses;
 using X.PagedList;
 using X.PagedList.EF;
 using Musify.Application.Contracts;
+using Musify.Domain.ValueObjects;
 
 namespace Musify.Application.Tracks
 {
-    public record GetTracksQuery(string? Name, int PageNumber, int PageSize)
+    public record GetTracksQuery(string? Name, int PageNumber, int PageSize, Genre? Genre = null)
         : IQuery<ErrorOr<TracksSearchResponse>>;
 
     public class GetTracksQueryHandler(IDatabase database)
@@ -28,6 +29,9 @@ namespace Musify.Application.Tracks
                 tracksQuery = tracksQuery.Where(t => t.Track.NormalizedTitle.Contains(normalizedName));
             }
 
+            if (request.Genre is { } genre)
+                tracksQuery = tracksQuery.Where(t => t.Track.Tags.Any(tag => tag.Tag == genre));
+
             var totalCount = await tracksQuery.CountAsync(cancellationToken);
 
             var pagedEntities = await tracksQuery

backend/Hosts/Musify.Api/Endpoints/GenreEndpoints.cs

@@ -0,0 +1,39 @@
+using Mediator;
+using Musify.Application.Genres;
+
+namespace Musify.Api.Endpoints;
+
+public static class GenreEndpoints
+{
+    public static IEndpointRouteBuilder MapGenreEndpoints(this IEndpointRouteBuilder app)
+    {
+        var group = app.MapGroup("/genres")
+            .WithTags("Genres");
+
+        group.MapGet("/", GetGenres)
+            .WithName("GetGenres")
+            .WithSummary("Get The Genres That Have At Least One Track, Most Populated First. Works Anonymously.")
+            .Produces<IReadOnlyList<GenreResponse>>();
+
+        group.MapGet("/available", GetAvailableGenres)
+            .WithName("GetAvailableGenres")
+            .WithSummary("Get Every Genre A Track Can Be Tagged With, Including The Genres It Cannot Be Combined With. Works Anonymously.")
+            .Produces<IReadOnlyList<AvailableGenreResponse>>();
+
+        return app;
+    }
+
+    private static async Task<IReadOnlyList<AvailableGenreResponse>> GetAvailableGenres(
+        IMediator mediator,
+        CancellationToken cancellationToken)
+    {
+        return await mediator.Send(new GetAvailableGenresQuery(), cancellationToken);
+    }
+
+    private static async Task<IReadOnlyList<GenreResponse>> GetGenres(
+        IMediator mediator,
+        CancellationToken cancellationToken)
+    {
+        return await mediator.Send(new GetGenresQuery(), cancellationToken);
+    }
+}

backend/Hosts/Musify.Api/Endpoints/TrackEndpoints.cs

@@ -1,4 +1,5 @@
 using Mediator;
+using Musify.Domain.ValueObjects;
 using Musify.Application.Tracks;
 using Musify.Application.Tracks.Responses;
 using Musify.Application.Shared;
@@ -19,8 +20,9 @@ public static class TrackEndpoints
 
         group.MapGet("/", GetTracks)
             .WithName("GetTracks")
-            .WithSummary("Get Paginated Tracks, Optionally Filtered By Name.")
-            .Produces<TracksSearchResponse>();
+            .WithSummary("Get Paginated Tracks, Optionally Filtered By Name And Genre.")
+            .Produces<TracksSearchResponse>()
+            .ProducesValidationProblem();
 
         group.MapGet("/{id}", GetTrackById)
             .WithName("GetTrackById")
@@ -92,10 +94,25 @@ public static class TrackEndpoints
         IMediator mediator,
         CancellationToken cancellationToken,
         string? name,
+        string? genre,
         int pageNumber = 1,
         int pageSize = 10)
     {
-        var result = await mediator.Send(new GetTracksQuery(name, pageNumber, pageSize), cancellationToken);
+        Genre? parsedGenre = null;
+        if (!string.IsNullOrWhiteSpace(genre))
+        {
+            if (!Enum.TryParse<Genre>(genre, ignoreCase: true, out var value) || !Enum.IsDefined(value))
+            {
+                return Results.ValidationProblem(new Dictionary<string, string[]>
+                {
+                    [nameof(genre)] = [$"'{genre}' is not a valid genre."]
+                });
+            }
+
+            parsedGenre = value;
+        }
+
+        var result = await mediator.Send(new GetTracksQuery(name, pageNumber, pageSize, parsedGenre), cancellationToken);
         return result.ToHttpResult();
     }
 

backend/Hosts/Musify.Api/Program.cs

@@ -40,6 +40,7 @@ app.UseAuthorization();
 app
     .MapAlbumEndpoints()
     .MapConfigEndpoints()
+    .MapGenreEndpoints()
     .MapLikeEndpoints()
     .MapMixEndpoints()
     .MapPlayListEndpoints()

backend/Tests/Musify.Api.Tests/Endpoints/GenreEndpointsTests.cs

@@ -0,0 +1,106 @@
+using System.Net;
+using System.Net.Http.Json;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Microsoft.Extensions.DependencyInjection;
+using Musify.Api.Tests.TestSupport;
+using Musify.Application.Genres;
+using Musify.Application.Tracks.Responses;
+using Musify.Domain.Entities;
+using Musify.Domain.ValueObjects;
+using Musify.Infrastructure.Persistence;
+using Xunit;
+
+namespace Musify.Api.Tests.Endpoints
+{
+    [Collection(ApiCollection.Name)]
+    public sealed class GenreEndpointsTests(ApiTestFixture fixture)
+    {
+        private static readonly JsonSerializerOptions JsonOptions = new(JsonSerializerDefaults.Web)
+        {
+            Converters = { new JsonStringEnumConverter() }
+        };
+
+        private async Task<string> SeedTrackAsync(Genre genre)
+        {
+            using var scope = fixture.Services.CreateScope();
+            var database = scope.ServiceProvider.GetRequiredService<Database>();
+            var owner = new User { Id = Random.Shared.NextInt64(1, long.MaxValue), Name = "genre-owner", NormalizedName = "GENRE-OWNER" };
+            var title = $"Genre track {Guid.NewGuid():N}";
+            var track = new Track
+            {
+                Title = title,
+                NormalizedTitle = title.ToUpperInvariant(),
+                OwnerUserId = owner.Id,
+                Owner = owner,
+                Tags = [new TrackTag { TrackId = Guid.Empty, Tag = genre }]
+            };
+            foreach (var tag in track.Tags)
+                tag.TrackId = track.Id;
+            database.Users.Add(owner);
+            database.Tracks.Add(track);
+            database.UserHasTracks.Add(new UserHasTrack { UserId = owner.Id, TrackId = track.Id });
+            await database.SaveChangesAsync(TestContext.Current.CancellationToken);
+            return title;
+        }
+
+        [Fact]
+        public async Task GetGenres_Anonymous_ListsGenresInUse()
+        {
+            await SeedTrackAsync(Genre.Funk);
+
+            var response = await fixture.CreateAnonymousClient().GetAsync("/genres", TestContext.Current.CancellationToken);
+
+            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+            var body = await response.Content.ReadFromJsonAsync<List<GenreResponse>>(JsonOptions, TestContext.Current.CancellationToken);
+            Assert.Contains(body!, g => g.Genre == Genre.Funk && g.TrackCount >= 1);
+        }
+
+        [Fact]
+        public async Task GetAvailableGenres_Anonymous_ListsEveryGenreWithIncompatibilities()
+        {
+            var response = await fixture.CreateAnonymousClient().GetAsync("/genres/available", TestContext.Current.CancellationToken);
+
+            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+            var body = await response.Content.ReadFromJsonAsync<List<AvailableGenreResponse>>(JsonOptions, TestContext.Current.CancellationToken);
+            Assert.Equal(Enum.GetValues<Genre>().Length, body!.Count);
+            Assert.Contains(Genre.Lofi, body.Single(g => g.Genre == Genre.Metal).IncompatibleWith);
+        }
+
+        [Theory]
+        [InlineData("Nope")]
+        [InlineData("999")]
+        public async Task GetTracks_UnknownGenre_ReturnsBadRequest(string genre)
+        {
+            var response = await fixture.CreateAnonymousClient().GetAsync($"/tracks?genre={genre}", TestContext.Current.CancellationToken);
+
+            Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
+        }
+
+        [Fact]
+        public async Task GetTracks_GenreQuery_IsCaseInsensitive()
+        {
+            var title = await SeedTrackAsync(Genre.Blues);
+
+            var response = await fixture.CreateAnonymousClient().GetAsync("/tracks?genre=blues&pageSize=100", TestContext.Current.CancellationToken);
+
+            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+            var body = await response.Content.ReadFromJsonAsync<TracksSearchResponse>(JsonOptions, TestContext.Current.CancellationToken);
+            Assert.Contains(body!.Items, item => item.Track.Title == title);
+        }
+
+        [Fact]
+        public async Task GetTracks_GenreQuery_FiltersByTag()
+        {
+            var title = await SeedTrackAsync(Genre.Ambient);
+            await SeedTrackAsync(Genre.Techno);
+
+            var response = await fixture.CreateAnonymousClient().GetAsync("/tracks?genre=Ambient&pageSize=100", TestContext.Current.CancellationToken);
+
+            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+            var body = await response.Content.ReadFromJsonAsync<TracksSearchResponse>(JsonOptions, TestContext.Current.CancellationToken);
+            Assert.Contains(body!.Items, item => item.Track.Title == title);
+            Assert.All(body.Items, item => Assert.Contains(Genre.Ambient, item.Track.Tags));
+        }
+    }
+}

backend/Tests/Musify.Application.Tests/Genres/GetAvailableGenresQueryHandlerTests.cs

@@ -0,0 +1,32 @@
+using Musify.Application.Genres;
+using Musify.Domain.ValueObjects;
+using Xunit;
+
+namespace Musify.Application.Tests.Genres
+{
+    public sealed class GetAvailableGenresQueryHandlerTests
+    {
+        private static async Task<IReadOnlyList<AvailableGenreResponse>> RunAsync() =>
+            await new GetAvailableGenresQueryHandler().Handle(new GetAvailableGenresQuery(), TestContext.Current.CancellationToken);
+
+        [Fact]
+        public async Task Handle_ReturnsEveryGenre()
+        {
+            var result = await RunAsync();
+
+            Assert.Equal(Enum.GetValues<Genre>(), result.Select(r => r.Genre));
+        }
+
+        [Fact]
+        public async Task Handle_ListsIncompatibleGenresSymmetrically()
+        {
+            var result = await RunAsync();
+
+            var metal = result.Single(r => r.Genre == Genre.Metal);
+            var lofi = result.Single(r => r.Genre == Genre.Lofi);
+            Assert.Contains(Genre.Lofi, metal.IncompatibleWith);
+            Assert.Contains(Genre.Metal, lofi.IncompatibleWith);
+            Assert.Empty(result.Single(r => r.Genre == Genre.Pop).IncompatibleWith);
+        }
+    }
+}

backend/Tests/Musify.Application.Tests/Genres/GetGenresQueryHandlerTests.cs

@@ -0,0 +1,69 @@
+using Musify.Application.Genres;
+using Musify.Application.Tests.TestSupport;
+using Musify.Domain.Entities;
+using Musify.Domain.ValueObjects;
+using Xunit;
+
+namespace Musify.Application.Tests.Genres
+{
+    public sealed class GetGenresQueryHandlerTests : HandlerTestBase
+    {
+        private GetGenresQueryHandler CreateHandler() => new(Database);
+
+        [Fact]
+        public async Task Handle_NoTracks_ReturnsEmpty()
+        {
+            var result = await CreateHandler().Handle(new GetGenresQuery(), TestContext.Current.CancellationToken);
+
+            Assert.Empty(result);
+        }
+
+        [Fact]
+        public async Task Handle_ReturnsOnlyGenresInUse_MostPopulatedFirst()
+        {
+            var owner = TestEntities.User();
+            var rockA = TestEntities.Track(owner, "Rock A", tags: [Genre.Rock]);
+            var rockB = TestEntities.Track(owner, "Rock B", tags: [Genre.Rock, Genre.Indie]);
+            var jazz = TestEntities.Track(owner, "Jazz", tags: [Genre.Jazz]);
+            await SeedAsync(
+                owner, rockA, rockB, jazz,
+                new UserHasTrack { UserId = owner.Id, TrackId = rockA.Id },
+                new UserHasTrack { UserId = owner.Id, TrackId = rockB.Id },
+                new UserHasTrack { UserId = owner.Id, TrackId = jazz.Id });
+
+            var result = await CreateHandler().Handle(new GetGenresQuery(), TestContext.Current.CancellationToken);
+
+            Assert.Equal(
+                [(Genre.Rock, 2), (Genre.Jazz, 1), (Genre.Indie, 1)],
+                result.Select(r => (r.Genre, r.TrackCount)));
+        }
+
+        [Fact]
+        public async Task Handle_TrackInSeveralLibraries_IsCountedOnce()
+        {
+            var owner = TestEntities.User();
+            var other = TestEntities.User(id: 2, name: "other-user");
+            var track = TestEntities.Track(owner, tags: [Genre.Pop]);
+            await SeedAsync(
+                owner, other, track,
+                new UserHasTrack { UserId = owner.Id, TrackId = track.Id },
+                new UserHasTrack { UserId = other.Id, TrackId = track.Id });
+
+            var result = await CreateHandler().Handle(new GetGenresQuery(), TestContext.Current.CancellationToken);
+
+            Assert.Equal(1, Assert.Single(result).TrackCount);
+        }
+
+        [Fact]
+        public async Task Handle_TrackNotInAnyLibrary_IsIgnored()
+        {
+            var owner = TestEntities.User();
+            var track = TestEntities.Track(owner, tags: [Genre.Metal]);
+            await SeedAsync(owner, track);
+
+            var result = await CreateHandler().Handle(new GetGenresQuery(), TestContext.Current.CancellationToken);
+
+            Assert.Empty(result);
+        }
+    }
+}

backend/Tests/Musify.Application.Tests/Tracks/GetTracksQueryHandlerTests.cs

@@ -1,5 +1,6 @@
 using Musify.Application.Tests.TestSupport;
 using Musify.Application.Tracks;
+using Musify.Domain.ValueObjects;
 using Xunit;
 
 namespace Musify.Application.Tests.Tracks
@@ -43,5 +44,23 @@ namespace Musify.Application.Tests.Tracks
             var item = Assert.Single(result.Value.Items);
             Assert.Equal("Bohemian Rhapsody", item.Track.Title);
         }
+
+        [Fact]
+        public async Task Handle_GenreFilter_ReturnsOnlyTracksWithThatTag()
+        {
+            var owner = TestEntities.User();
+            var rock = TestEntities.Track(owner, "Loud", tags: [Genre.Rock, Genre.Indie]);
+            var jazz = TestEntities.Track(owner, "Smooth", tags: [Genre.Jazz]);
+            await SeedAsync(
+                owner, rock, jazz,
+                new Musify.Domain.Entities.UserHasTrack { UserId = owner.Id, TrackId = rock.Id },
+                new Musify.Domain.Entities.UserHasTrack { UserId = owner.Id, TrackId = jazz.Id });
+
+            var result = await CreateHandler().Handle(new GetTracksQuery(null, 1, 10, Genre.Indie), TestContext.Current.CancellationToken);
+
+            Assert.False(result.IsError);
+            var item = Assert.Single(result.Value.Items);
+            Assert.Equal("Loud", item.Track.Title);
+        }
     }
 }

web-player/src/lib/data/genres.ts

@@ -1,22 +1,75 @@
-export const GENRE_INFO: Record<string, { label: string; tagline: string }> = {
-	pop: { label: 'Pop', tagline: 'Éxitos que suenan en todas partes' },
-	rock: { label: 'Rock', tagline: 'Guitarras, actitud y ruido' },
-	reggaeton: { label: 'Reggaetón', tagline: 'El ritmo que no para' },
-	'lo-fi': { label: 'Lo-fi', tagline: 'Para concentrarte o relajarte' },
-	indie: { label: 'Indie', tagline: 'Voces fuera del radar' },
-	salsa: { label: 'Salsa', tagline: 'Para mover el cuerpo' },
-	'k-pop': { label: 'K-pop', tagline: 'Coreografías pegajosas' },
-	electrónica: { label: 'Electrónica', tagline: 'Beats para perderte' },
-	jazz: { label: 'Jazz', tagline: 'Improvisación y elegancia' },
-	baladas: { label: 'Baladas', tagline: 'Para sentir con calma' },
-	trap: { label: 'Trap', tagline: 'Autotune y bajos pesados' },
-	cumbia: { label: 'Cumbia', tagline: 'El sabor de siempre' },
-	'hip hop': { label: 'Hip hop', tagline: 'Rimas con actitud' },
-	'música clásica': { label: 'Clásica', tagline: 'Siglos de composición' }
+const GENRE_INFO: Record<string, { label: string; tagline: string }> = {
+	Pop: { label: 'Pop', tagline: 'Éxitos que suenan en todas partes' },
+	Rock: { label: 'Rock', tagline: 'Guitarras, actitud y ruido' },
+	HipHop: { label: 'Hip hop', tagline: 'Rimas con actitud' },
+	RnB: { label: 'R&B', tagline: 'Ritmo suave y voces con alma' },
+	Jazz: { label: 'Jazz', tagline: 'Improvisación y elegancia' },
+	Blues: { label: 'Blues', tagline: 'Sentimiento en cada nota' },
+	Classical: { label: 'Clásica', tagline: 'Siglos de composición' },
+	Electronic: { label: 'Electrónica', tagline: 'Beats para perderte' },
+	House: { label: 'House', tagline: 'Pista de baile sin fin' },
+	Techno: { label: 'Techno', tagline: 'Pulso hipnótico' },
+	Trance: { label: 'Trance', tagline: 'Melodías que te elevan' },
+	Dubstep: { label: 'Dubstep', tagline: 'Bajos que hacen temblar' },
+	DrumAndBass: { label: 'Drum and bass', tagline: 'Velocidad y graves' },
+	Metal: { label: 'Metal', tagline: 'Riffs pesados' },
+	Punk: { label: 'Punk', tagline: 'Rápido, crudo y directo' },
+	Reggae: { label: 'Reggae', tagline: 'Buenas vibraciones' },
+	Reggaeton: { label: 'Reggaetón', tagline: 'El ritmo que no para' },
+	Country: { label: 'Country', tagline: 'Historias con guitarra' },
+	Folk: { label: 'Folk', tagline: 'Raíces y acústico' },
+	Indie: { label: 'Indie', tagline: 'Voces fuera del radar' },
+	KPop: { label: 'K-pop', tagline: 'Coreografías pegajosas' },
+	Latin: { label: 'Latina', tagline: 'Sabor y ritmo' },
+	Soul: { label: 'Soul', tagline: 'Emoción en estado puro' },
+	Funk: { label: 'Funk', tagline: 'Groove imposible de quedarse quieto' },
+	Ambient: { label: 'Ambient', tagline: 'Paisajes sonoros' },
+	Lofi: { label: 'Lo-fi', tagline: 'Para concentrarte o relajarte' }
 };
 
-export const genreTiles = Object.entries(GENRE_INFO).map(([query, info], i, all) => ({
-	query,
-	hue: Math.round((i * 360) / all.length),
-	...info
-}));
+const KNOWN_GENRES = Object.keys(GENRE_INFO);
+
+function humanize(name: string): string {
+	return name.replace(/([a-z])([A-Z])/g, '$1 $2');
+}
+
+export function genreInfo(genre: string) {
+	return GENRE_INFO[genre] ?? { label: humanize(genre), tagline: '' };
+}
+
+export function genreHue(genre: string): number {
+	const known = KNOWN_GENRES.indexOf(genre);
+	if (known >= 0) return Math.round((known * 360) / KNOWN_GENRES.length);
+	let hash = 0;
+	for (const char of genre) hash = (hash * 31 + char.charCodeAt(0)) % 360;
+	return hash;
+}
+
+export function genreTiles(genres: { genre: string }[]) {
+	return genres.map(({ genre }) => ({
+		genre,
+		hue: genreHue(genre),
+		...genreInfo(genre)
+	}));
+}
+
+export function genreOptions(genres: { genre: string; incompatibleWith: string[] }[]) {
+	return genres.map(({ genre, incompatibleWith }) => ({
+		genre,
+		incompatibleWith,
+		label: genreInfo(genre).label
+	}));
+}
+
+export function findConflict(
+	tags: string[],
+	options: { genre: string; incompatibleWith: string[] }[]
+): [string, string] | undefined {
+	const byGenre = new Map(options.map((option) => [option.genre, option.incompatibleWith]));
+	for (let i = 0; i < tags.length; i++) {
+		for (let j = i + 1; j < tags.length; j++) {
+			if (byGenre.get(tags[i])?.includes(tags[j])) return [tags[i], tags[j]];
+		}
+	}
+	return undefined;
+}

web-player/src/lib/data/trackGenres.ts

@@ -1,56 +0,0 @@
-export const TRACK_GENRES = [
-	{ value: 'Pop', label: 'Pop' },
-	{ value: 'Rock', label: 'Rock' },
-	{ value: 'HipHop', label: 'Hip-hop' },
-	{ value: 'RnB', label: 'R&B' },
-	{ value: 'Jazz', label: 'Jazz' },
-	{ value: 'Blues', label: 'Blues' },
-	{ value: 'Classical', label: 'Clásica' },
-	{ value: 'Electronic', label: 'Electrónica' },
-	{ value: 'House', label: 'House' },
-	{ value: 'Techno', label: 'Techno' },
-	{ value: 'Trance', label: 'Trance' },
-	{ value: 'Dubstep', label: 'Dubstep' },
-	{ value: 'DrumAndBass', label: 'Drum and bass' },
-	{ value: 'Metal', label: 'Metal' },
-	{ value: 'Punk', label: 'Punk' },
-	{ value: 'Reggae', label: 'Reggae' },
-	{ value: 'Reggaeton', label: 'Reggaetón' },
-	{ value: 'Country', label: 'Country' },
-	{ value: 'Folk', label: 'Folk' },
-	{ value: 'Indie', label: 'Indie' },
-	{ value: 'KPop', label: 'K-pop' },
-	{ value: 'Latin', label: 'Latina' },
-	{ value: 'Soul', label: 'Soul' },
-	{ value: 'Funk', label: 'Funk' },
-	{ value: 'Ambient', label: 'Ambient' },
-	{ value: 'Lofi', label: 'Lo-fi' }
-] as const;
-
-export type TrackGenre = (typeof TRACK_GENRES)[number]['value'];
-
-const GENRE_VALUES: ReadonlySet<string> = new Set(TRACK_GENRES.map((genre) => genre.value));
-
-const INTENSE: ReadonlySet<TrackGenre> = new Set(['Metal', 'Punk', 'Dubstep', 'DrumAndBass']);
-const MELLOW: ReadonlySet<TrackGenre> = new Set(['Classical', 'Ambient', 'Lofi']);
-
-export function isTrackGenre(value: string): value is TrackGenre {
-	return GENRE_VALUES.has(value);
-}
-
-export function areCompatible(a: TrackGenre, b: TrackGenre): boolean {
-	return !((INTENSE.has(a) && MELLOW.has(b)) || (INTENSE.has(b) && MELLOW.has(a)));
-}
-
-export function genreLabel(value: TrackGenre): string {
-	return TRACK_GENRES.find((genre) => genre.value === value)?.label ?? value;
-}
-
-export function findConflict(tags: readonly TrackGenre[]): [TrackGenre, TrackGenre] | undefined {
-	for (let i = 0; i < tags.length; i++) {
-		for (let j = i + 1; j < tags.length; j++) {
-			if (!areCompatible(tags[i], tags[j])) return [tags[i], tags[j]];
-		}
-	}
-	return undefined;
-}

web-player/src/lib/state/navigation.svelte.ts

@@ -68,6 +68,10 @@ export function searchHref(query: string): string {
 	return query ? `/explore?q=${encodeURIComponent(query)}` : '/explore';
 }
 
+export function genreHref(genre: string): string {
+	return `/explore?genre=${encodeURIComponent(genre)}`;
+}
+
 export interface AppNavLink {
 	href: string;
 	label: string;

web-player/src/routes/(app)/explore/+page.server.ts

@@ -9,13 +9,25 @@ import {
 
 export const load: PageServerLoad = async ({ url, locals, fetch }) => {
 	const query = url.searchParams.get('q')?.trim() ?? '';
+	const genreParam = url.searchParams.get('genre')?.trim() || null;
 	const page = Math.max(1, Number(url.searchParams.get('page')) || 1);
 
 	const user = locals.user;
 	const api = createApiClient({ fetch, accessToken: locals.accessToken ?? undefined });
 
+	const genresRes = await api.GET('/genres');
+	const genres = genresRes.data ?? [];
+	const genre = genres.find((item) => item.genre === genreParam)?.genre ?? null;
+
 	const tracksPromise = api.GET('/tracks', {
-		params: { query: { name: query || undefined, pageNumber: page, pageSize: PAGE_SIZE } }
+		params: {
+			query: {
+				name: query || undefined,
+				genre: genre ?? undefined,
+				pageNumber: page,
+				pageSize: PAGE_SIZE
+			}
+		}
 	});
 
 	const playlistsPromise = user
@@ -47,6 +59,8 @@ export const load: PageServerLoad = async ({ url, locals, fetch }) => {
 
 	return {
 		query,
+		genre,
+		genres,
 		tracks,
 		albums: (albumsRes?.data?.items ?? []).map((item) => item.album),
 		users: usersRes?.data?.items ?? [],

web-player/src/routes/(app)/explore/+page.svelte

@@ -16,13 +16,13 @@
 	import Chip from '$lib/components/ui/primitives/Chip.svelte';
 	import SectionHeading from '$lib/components/ui/layout/SectionHeading.svelte';
 	import { EXPLORE_PAGE_SIZE } from '$lib/config';
-	import { searchHref } from '$lib/state/navigation.svelte';
+	import { genreHref } from '$lib/state/navigation.svelte';
 	import { createTrackMenu } from '$lib/state/menus.svelte';
 	import ContextMenu, { contextMenuPosition } from '$lib/components/ui/overlay/ContextMenu.svelte';
 	import ListPlus from '@lucide/svelte/icons/list-plus';
 	import ListEnd from '@lucide/svelte/icons/list-end';
 	import { appendUnique } from '$lib/data/collections';
-	import { genreTiles } from '$lib/data/genres';
+	import { genreInfo, genreTiles } from '$lib/data/genres';
 	import {
 		type SearchFilter,
 		showGroup,
@@ -58,7 +58,7 @@
 	$effect(() => {
 		trackMenu.close();
 		albumMenu = null;
-		sfilter = 'Todo';
+		sfilter = data.genre ? 'Canciones' : 'Todo';
 		localItems = data.tracks.items.map((item) => item.track);
 		localPage = Number(data.tracks.pageNumber);
 		hasMore = data.tracks.hasNextPage;
@@ -73,6 +73,9 @@
 
 	const items = $derived(songRows.map((row) => row.track));
 
+	const tiles = $derived(genreTiles(data.genres));
+	const activeGenre = $derived(data.genre ? genreInfo(data.genre) : null);
+
 	const albums = $derived(data.albums);
 	const users = $derived(data.users);
 
@@ -169,6 +172,7 @@
 				pageSize: String(EXPLORE_PAGE_SIZE)
 			});
 			if (data.query) params.set('name', data.query);
+			if (data.genre) params.set('genre', data.genre);
 			const res = await fetch(`/api/tracks?${params}`);
 			if (!res.ok) throw new Error(String(res.status));
 			const next = (await res.json()) as typeof data.tracks;
@@ -188,7 +192,9 @@
 </script>
 
 <svelte:head>
-	<title>{data.query ? `Buscar «${data.query}»` : 'Descubrir'}</title>
+	<title
+		>{activeGenre ? activeGenre.label : data.query ? `Buscar «${data.query}»` : 'Descubrir'}</title
+	>
 	<meta
 		name="description"
 		content="Busca canciones, álbumes y personas, o descubre por género en Musify."
@@ -196,7 +202,9 @@
 </svelte:head>
 
 <Page>
-	{#if !data.query}
+	{#if activeGenre}
+		<PageHeader eyebrow="Género" title={activeGenre.label} description={activeGenre.tagline} />
+	{:else if !data.query}
 		<PageHeader
 			title="Descubrir"
 			description="Encuentra tu próxima canción favorita explorando por género."
@@ -300,31 +308,34 @@
 				por playlist.
 			</p>
 			<div class="mt-5.5 flex flex-wrap justify-center gap-2">
-				{#each genreTiles.slice(0, 4) as genre (genre.query)}
-					<Chip href={searchHref(genre.query)}>{genre.label}</Chip>
+				{#each tiles.slice(0, 4) as tile (tile.genre)}
+					<Chip href={genreHref(tile.genre)}>{tile.label}</Chip>
 				{/each}
 			</div>
 		</div>
 	{/if}
 
-	{#if !data.query}
+	{#if !data.query && !data.genre}
 		<div class="grid-wide">
-			{#each genreTiles as genre, i (genre.query)}
+			{#each tiles as tile, i (tile.genre)}
 				<a
-					href={searchHref(genre.query)}
+					href={genreHref(tile.genre)}
 					class="animate-enter group relative flex h-28 flex-col gap-1 overflow-hidden rounded-panel p-4 transition-[filter] genre-tile hover:brightness-110"
-					style="--i:{i}; --tile-hue:{genre.hue}"
+					style="--i:{i}; --tile-hue:{tile.hue}"
 				>
 					<div class="text-on-art">
-						{genre.label}
+						{tile.label}
 					</div>
-					<div class="text-xs text-on-art-2">{genre.tagline}</div>
+					<div class="text-xs text-on-art-2">{tile.tagline}</div>
 				</a>
 			{/each}
 		</div>
+		{#if tiles.length === 0}
+			<EmptyState icon={Music} description="Todavía no hay géneros. Sube música para empezar." />
+		{/if}
 	{/if}
 
-	{#if data.query && !nothingFound}
+	{#if (data.query || data.genre) && !nothingFound}
 		<div class="mt-9 flex flex-col gap-9">
 			{#if showGroup(sfilter, 'Canciones')}
 				<div>
@@ -364,7 +375,9 @@
 					{:else}
 						<EmptyState
 							icon={Music}
-							description="No hay canciones que coincidan con «{data.query}»."
+							description={activeGenre
+								? 'Todavía no hay canciones de este género.'
+								: `No hay canciones que coincidan con «${data.query}».`}
 						/>
 					{/if}
 				</div>

web-player/src/routes/(app)/upload/+page.server.ts

@@ -7,12 +7,18 @@ import {
 	unwrapOrFail
 } from '$lib/server/api';
 import { putPresigned, extOf, contentTypeOf, AUDIO_TYPES, IMAGE_TYPES } from '$lib/server/upload';
-import { findConflict, genreLabel, isTrackGenre, type TrackGenre } from '$lib/data/trackGenres';
+import { findConflict, genreInfo } from '$lib/data/genres';
+import type { components } from '$lib/api/schema';
+
+type Genre = components['schemas']['Genre'];
 
 const MAX_TITLE = 100;
 
-export const load: PageServerLoad = ({ locals, url }) => {
+export const load: PageServerLoad = async ({ locals, url, fetch }) => {
 	requireUser(locals, url);
+	const api = createApiClient({ fetch, accessToken: locals.accessToken ?? undefined });
+	const { data } = await api.GET('/genres/available');
+	return { genres: data ?? [] };
 };
 
 export const actions: Actions = {
@@ -39,20 +45,23 @@ export const actions: Actions = {
 		if (rawTags.length === 0) {
 			return fail(400, { message: 'Elige al menos un género.' });
 		}
-		if (!rawTags.every(isTrackGenre)) {
+		const api = createApiClient({ fetch, accessToken });
+		const { data: available } = await api.GET('/genres/available');
+		const options = available ?? [];
+		const known = new Set<string>(options.map((option) => option.genre));
+		if (!rawTags.every((tag) => known.has(tag))) {
 			return fail(400, { message: 'Alguno de los géneros no es válido.' });
 		}
-		const tags: TrackGenre[] = [...new Set(rawTags)];
-		const conflict = findConflict(tags);
+		const tags = [...new Set(rawTags)] as Genre[];
+		const conflict = findConflict(tags, options);
 		if (conflict) {
 			return fail(400, {
-				message: `Los géneros ${genreLabel(conflict[0])} y ${genreLabel(conflict[1])} no se pueden combinar.`
+				message: `Los géneros ${genreInfo(conflict[0]).label} y ${genreInfo(conflict[1]).label} no se pueden combinar.`
 			});
 		}
 
 		const audioContentType = contentTypeOf(audio, AUDIO_TYPES);
 		const pictureContentType = contentTypeOf(cover, IMAGE_TYPES);
-		const api = createApiClient({ fetch, accessToken });
 
 		const urlsResult = await api.POST('/tracks/upload-urls', {
 			body: {

web-player/src/routes/(app)/upload/+page.svelte

@@ -14,13 +14,15 @@
 	import Checkbox from '$lib/components/ui/primitives/Checkbox.svelte';
 	import Button from '$lib/components/ui/primitives/Button.svelte';
 	import Chip from '$lib/components/ui/primitives/Chip.svelte';
-	import { TRACK_GENRES, areCompatible, type TrackGenre } from '$lib/data/trackGenres';
+	import { genreOptions } from '$lib/data/genres';
 
 	type Status = 'idle' | 'uploading' | 'done' | 'error';
 	type StepState = 'idle' | 'active' | 'done';
 
 	const MAX_TITLE = 100;
 
+	let { data } = $props();
+
 	let title = $state('');
 	let audioName = $state('');
 	let audioSize = $state(0);
@@ -31,7 +33,7 @@
 	let acceptedTerms = $state(false);
 	let errorMsg = $state('');
 	let errorDetail = $state('');
-	let tags = $state<TrackGenre[]>([]);
+	let tags = $state<string[]>([]);
 	let publishedTitle = $state('');
 	let audioInput = $state<HTMLInputElement>();
 
@@ -41,6 +43,15 @@
 		{ key: 'publish', label: 'Publicar', hint: 'Disponible en el catálogo.' }
 	];
 
+	const options = $derived(genreOptions(data.genres));
+	const blocked = $derived(
+		new Set(
+			options
+				.filter((option) => tags.includes(option.genre))
+				.flatMap((option) => option.incompatibleWith)
+		)
+	);
+
 	const busy = $derived(status === 'uploading');
 
 	const canPublish = $derived(
@@ -85,14 +96,10 @@
 		pickAudio(file);
 	}
 
-	function toggleTag(tag: TrackGenre) {
+	function toggleTag(tag: string) {
 		tags = tags.includes(tag) ? tags.filter((current) => current !== tag) : [...tags, tag];
 	}
 
-	function tagBlocked(tag: TrackGenre) {
-		return !tags.includes(tag) && tags.some((current) => !areCompatible(current, tag));
-	}
-
 	function reset() {
 		title = '';
 		audioName = '';
@@ -254,13 +261,13 @@
 
 			<Field label="Géneros">
 				<div class="flex flex-wrap gap-2">
-					{#each TRACK_GENRES as genre (genre.value)}
+					{#each options as option (option.genre)}
 						<Chip
-							selected={tags.includes(genre.value)}
-							disabled={tagBlocked(genre.value)}
-							onclick={() => toggleTag(genre.value)}
+							selected={tags.includes(option.genre)}
+							disabled={blocked.has(option.genre)}
+							onclick={() => toggleTag(option.genre)}
 						>
-							{genre.label}
+							{option.label}
 						</Chip>
 					{/each}
 				</div>

web-player/src/routes/api/tracks/+server.ts

@@ -5,12 +5,13 @@ import { EXPLORE_PAGE_SIZE } from '$lib/config';
 
 export const GET: RequestHandler = async ({ url, locals, fetch }) => {
 	const name = url.searchParams.get('name')?.trim() || undefined;
+	const genre = url.searchParams.get('genre')?.trim() || undefined;
 	const pageNumber = Math.max(1, Number(url.searchParams.get('pageNumber')) || 1);
 	const pageSize = Math.max(1, Number(url.searchParams.get('pageSize')) || EXPLORE_PAGE_SIZE);
 
 	const api = createApiClient({ fetch, accessToken: locals.accessToken ?? undefined });
 	const result = await api.GET('/tracks', {
-		params: { query: { name, pageNumber, pageSize } }
+		params: { query: { name, genre, pageNumber, pageSize } }
 	});
 
 	return json(unwrapOrError(result, 'No se pudieron cargar las canciones.'));