feat: add wav download quality

internal/deezer/track.go

@@ -47,10 +47,13 @@ func (t *Track) FullTitle() string {
 	return t.Title
 }
 
-func (t *Track) Filename(kind Kind, mediaFormat string) string {
+func (t *Track) Filename(kind Kind, format string) string {
 	ext := "mp3"
-	if mediaFormat == "FLAC" {
+	switch format {
+	case "FLAC":
 		ext = "flac"
+	case "WAV":
+		ext = "wav"
 	}
 
 	prefix := ""

internal/deezer/track_test.go

@@ -60,6 +60,13 @@ func TestFilename(t *testing.T) {
 			mediaFormat: "FLAC",
 			want:        "Artist - Song.flac",
 		},
+		{
+			name:        "wav extension",
+			track:       Track{Artist: "Artist", Title: "Song"},
+			kind:        KindTrack,
+			mediaFormat: "WAV",
+			want:        "Artist - Song.wav",
+		},
 		{
 			name:        "version appended",
 			track:       Track{Artist: "Artist", Title: "Song", Version: "(Live)"},