feat(tags): filter genres to avoid unusual tags

internal/provider/genre.go

@@ -9,6 +9,19 @@ import (
 	"github.com/PuerkitoBio/goquery"
 )
 
+var electronicKeywords = []string{
+	"Ambient", "Bass", "Big Room", "Breakbeat", "Dance", "Disco", "Downtempo",
+	"Drum And Bass", "Dub", "Dubstep", "EDM", "Electro", "Electronic", "Electronica",
+	"Eurodance", "Gabber", "Garage", "Hardcore", "Hardstyle", "House", "Industrial",
+	"Jungle", "Moombahton", "Synthpop", "Synthwave", "Techno", "Trance", "Trap",
+	"Trip Hop", "Vaporwave",
+}
+
+var nonElectronicKeywords = []string{
+	"Blues", "Chillout", "Classical", "Country", "Folk", "Funk", "Hip Hop", "Jazz",
+	"Latin", "Metal", "Pop", "R&B", "Rap", "Reggae", "Rock", "Soul",
+}
+
 type GenreProvider struct{}
 
 func (p GenreProvider) Fetch(ctx context.Context, httpClient *http.Client, artist, title string) (string, error) {
@@ -23,11 +36,16 @@ func (p GenreProvider) Fetch(ctx context.Context, httpClient *http.Client, artis
 		return "", fmt.Errorf("no data found")
 	}
 
-	if len(tags) > 1 {
+	if len(tags) > 2 {
 		tags = tags[:2]
 	}
-	genre := p.formatTags(tags)
 
+	filteredTags := p.filterTags(tags)
+	if len(filteredTags) == 0 {
+		return "", fmt.Errorf("no data found")
+	}
+
+	genre := p.formatTags(filteredTags)
 	return genre, nil
 }
 
@@ -67,6 +85,48 @@ func (p GenreProvider) parse(doc *goquery.Document) []string {
 	return tags
 }
 
+func (p GenreProvider) filterTags(tags []string) []string {
+	var electronicTags []string
+	var nonElectronicTags []string
+
+	for _, tag := range tags {
+		if p.isElectronicGenre(tag) {
+			electronicTags = append(electronicTags, tag)
+		} else if p.isNonElectronicGenre(tag) {
+			nonElectronicTags = append(nonElectronicTags, tag)
+		}
+	}
+
+	var filteredTags []string
+	filteredTags = append(filteredTags, electronicTags...)
+
+	if len(electronicTags) > 0 {
+		filteredTags = append(filteredTags, nonElectronicTags...)
+	}
+
+	return filteredTags
+}
+
+func (p GenreProvider) isElectronicGenre(tag string) bool {
+	tagLower := strings.ToLower(tag)
+	for _, allowed := range electronicKeywords {
+		if strings.Contains(tagLower, strings.ToLower(allowed)) {
+			return true
+		}
+	}
+	return false
+}
+
+func (p GenreProvider) isNonElectronicGenre(tag string) bool {
+	tagLower := strings.ToLower(tag)
+	for _, allowed := range nonElectronicKeywords {
+		if strings.Contains(tagLower, strings.ToLower(allowed)) {
+			return true
+		}
+	}
+	return false
+}
+
 func (p GenreProvider) formatTags(tags []string) string {
 	var formatted []string
 	for _, tag := range tags {
@@ -77,7 +137,9 @@ func (p GenreProvider) formatTags(tags []string) string {
 
 		words := strings.Fields(tag)
 		for i, w := range words {
-			words[i] = strings.Title(w)
+			if len(w) > 0 {
+				words[i] = strings.ToUpper(string(w[0])) + strings.ToLower(w[1:])
+			}
 		}
 		formatted = append(formatted, strings.Join(words, " "))
 	}