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 {