feat: infer beatport release artist

internal/provider/beatport/client.go

@@ -480,14 +480,16 @@ func (c *Client) rawRequest(ctx context.Context, method, endpoint string, params
 
 func (c *Client) normalizeRelease(raw map[string]any, tracks []any) map[string]any {
 	id := jsonutil.StringFromAny(raw["id"])
-	artist := c.releaseArtistName(raw["artists"])
+	artist := c.releaseArtistNameForTracks(raw["artists"], tracks)
+	trackRelease := cloneMap(raw)
+	trackRelease["album_artist_name"] = artist
 	items := make([]any, 0, len(tracks))
 	for _, entry := range tracks {
 		track, ok := entry.(map[string]any)
 		if !ok {
 			continue
 		}
-		track["release"] = raw
+		track["release"] = trackRelease
 		items = append(items, c.normalizeTrack(track))
 	}
 	return map[string]any{
@@ -510,7 +512,10 @@ func (c *Client) normalizeTrack(raw map[string]any) map[string]any {
 	trackArtistNames := artistNames(raw["artists"])
 	artistName := displayArtistNames(trackArtistNames)
 	artistID := firstArtistID(raw["artists"])
-	albumArtist := c.releaseArtistName(release["artists"])
+	albumArtist := strings.TrimSpace(jsonutil.StringFromAny(release["album_artist_name"]))
+	if albumArtist == "" {
+		albumArtist = c.releaseArtistName(release["artists"])
+	}
 	if albumArtist == "" {
 		albumArtist = artistName
 	}
@@ -693,6 +698,71 @@ func (c *Client) releaseArtistName(v any) string {
 	return displayArtistNames(artistNames(v))
 }
 
+func (c *Client) releaseArtistNameForTracks(releaseArtists any, tracks []any) string {
+	common := commonReleaseArtists(releaseArtists, tracks)
+	if len(common) > 0 {
+		return displayArtistNames(artistNames(common))
+	}
+	return c.releaseArtistName(releaseArtists)
+}
+
+func commonReleaseArtists(releaseArtists any, tracks []any) []any {
+	items := sliceAny(releaseArtists)
+	if len(items) == 0 || len(tracks) == 0 {
+		return nil
+	}
+	counts := map[string]int{}
+	trackCount := 0
+	for _, rawTrack := range tracks {
+		track, ok := rawTrack.(map[string]any)
+		if !ok {
+			continue
+		}
+		trackCount++
+		seen := map[string]bool{}
+		for _, rawArtist := range sliceAny(track["artists"]) {
+			if key := artistIdentity(rawArtist); key != "" {
+				seen[key] = true
+			}
+		}
+		for key := range seen {
+			counts[key]++
+		}
+	}
+	if trackCount == 0 {
+		return nil
+	}
+	common := make([]any, 0)
+	for _, rawArtist := range items {
+		if key := artistIdentity(rawArtist); key != "" && counts[key] == trackCount {
+			common = append(common, rawArtist)
+		}
+	}
+	return common
+}
+
+func artistIdentity(raw any) string {
+	m, ok := raw.(map[string]any)
+	if !ok {
+		return ""
+	}
+	if id := strings.TrimSpace(jsonutil.StringFromAny(m["id"])); id != "" {
+		return "id:" + id
+	}
+	if name := strings.TrimSpace(jsonutil.StringFromAny(m["name"])); name != "" {
+		return "name:" + strings.ToLower(name)
+	}
+	return ""
+}
+
+func cloneMap(in map[string]any) map[string]any {
+	out := make(map[string]any, len(in))
+	for k, v := range in {
+		out[k] = v
+	}
+	return out
+}
+
 func firstArtistID(v any) string {
 	items := sliceAny(v)
 	if len(items) == 0 {

internal/provider/beatport/client_test.go

@@ -114,7 +114,7 @@ func TestAlbumMetadataCollapsesManyReleaseArtists(t *testing.T) {
 			writeJSON(t, w, map[string]any{
 				"id":          7,
 				"name":        "Compilation",
-				"track_count": 1,
+				"track_count": 2,
 				"artists": []any{
 					map[string]any{"id": 1, "name": "A"},
 					map[string]any{"id": 2, "name": "B"},
@@ -125,12 +125,10 @@ func TestAlbumMetadataCollapsesManyReleaseArtists(t *testing.T) {
 		case "/catalog/releases/7/tracks/":
 			writeJSON(t, w, map[string]any{
 				"next": nil,
-				"results": []any{map[string]any{
-					"id":      42,
-					"name":    "Track Name",
-					"number":  1,
-					"artists": []any{map[string]any{"id": 1, "name": "A"}},
-				}},
+				"results": []any{
+					map[string]any{"id": 42, "name": "Track A", "number": 1, "artists": []any{map[string]any{"id": 1, "name": "A"}}},
+					map[string]any{"id": 43, "name": "Track B", "number": 2, "artists": []any{map[string]any{"id": 2, "name": "B"}}},
+				},
 			})
 		default:
 			t.Fatalf("unexpected path %q", r.URL.Path)
@@ -154,6 +152,52 @@ func TestAlbumMetadataCollapsesManyReleaseArtists(t *testing.T) {
 	}
 }
 
+func TestAlbumMetadataUsesArtistPresentOnEveryTrack(t *testing.T) {
+	c, closeServer := newTestClient(t, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch r.URL.Path {
+		case "/catalog/releases/7/":
+			writeJSON(t, w, map[string]any{
+				"id":          7,
+				"name":        "Artist Album",
+				"track_count": 3,
+				"artists": []any{
+					map[string]any{"id": 1, "name": "Main"},
+					map[string]any{"id": 2, "name": "Guest A"},
+					map[string]any{"id": 3, "name": "Guest B"},
+					map[string]any{"id": 4, "name": "Guest C"},
+				},
+			})
+		case "/catalog/releases/7/tracks/":
+			writeJSON(t, w, map[string]any{
+				"next": nil,
+				"results": []any{
+					map[string]any{"id": 42, "name": "Track A", "number": 1, "artists": []any{map[string]any{"id": 1, "name": "Main"}, map[string]any{"id": 2, "name": "Guest A"}}},
+					map[string]any{"id": 43, "name": "Track B", "number": 2, "artists": []any{map[string]any{"id": 1, "name": "Main"}, map[string]any{"id": 3, "name": "Guest B"}}},
+					map[string]any{"id": 44, "name": "Track C", "number": 3, "artists": []any{map[string]any{"id": 1, "name": "Main"}, map[string]any{"id": 4, "name": "Guest C"}}},
+				},
+			})
+		default:
+			t.Fatalf("unexpected path %q", r.URL.Path)
+		}
+	}))
+	defer closeServer()
+
+	meta, err := c.GetMetadata(context.Background(), "7", "album")
+	if err != nil {
+		t.Fatalf("GetMetadata() error = %v", err)
+	}
+	artist := meta["artist"].(map[string]any)
+	if artist["name"] != "Main" {
+		t.Fatalf("album artist = %q, want Main", artist["name"])
+	}
+	track := meta["tracks"].(map[string]any)["items"].([]any)[0].(map[string]any)
+	album := track["album"].(map[string]any)
+	albumArtist := album["artist"].(map[string]any)
+	if albumArtist["name"] != "Main" {
+		t.Fatalf("track album artist = %q, want Main", albumArtist["name"])
+	}
+}
+
 func TestReleaseArtistCollapseCanBeDisabled(t *testing.T) {
 	cfg := &config.Config{Session: config.DefaultConfigData(), File: config.DefaultConfigData()}
 	cfg.Session.Beatport.VariousArtistsThreshold = -1