feat: improve metadata implementation for track

lib/metadata.go

@@ -5,60 +5,34 @@ import (
 	"errors"
 )
 
-type Metadata struct {
-	SpotifyID    string `json:"spotify_id"`
-	Artists      string `json:"artists"`
-	Name         string `json:"name"`
-	AlbumName    string `json:"album_name"`
-	AlbumArtist  string `json:"album_artist"`
-	DurationMS   int    `json:"duration_ms"`
-	Images       string `json:"images"`
-	ReleaseDate  string `json:"release_date"`
-	TrackNumber  int    `json:"track_number"`
-	TotalTracks  int    `json:"total_tracks"`
-	DiscNumber   int    `json:"disc_number"`
-	TotalDiscs   int    `json:"total_discs"`
-	ExternalURLs string `json:"external_urls"`
-	Copyright    string `json:"copyright"`
-	Publisher    string `json:"publisher"`
-	Plays        string `json:"plays"`
-	IsExplicit   bool   `json:"is_explicit"`
-}
-
-func (app *App) GetMetadata(url string) (Metadata, error) {
-	urlType := ParseUrlType(url)
-
-	switch urlType {
-	case UrlTypeTrack:
-		app.GetTrackMetadata(url)
-	}
-
-	return Metadata{}, errors.New("Invalid URL.")
-}
-
-func (app *App) GetTrackMetadata(url string) error {
+func (app *App) GetTrackMetadata(url string) (TrackMetadata, error) {
 	client := NewSpotifyClient()
+	var result TrackMetadata
 
 	err := client.Initialize()
 	if err != nil {
-		return errors.New("Unable to fetch Spotify metadata.")
+		return result, errors.New("Unable to fetch Spotify metadata.")
 	}
 
 	trackId, err := ParseTrackId(url)
 	if err != nil {
-		return err
+		return result, err
 	}
 
 	payload := BuildSpotifyReqPayloadTrack(trackId)
 
 	rawMetadata, err := client.Query(payload)
 	if err != nil {
-		return err
+		return result, err
 	}
-	a, err := json.Marshal(rawMetadata)
-	println(string(a))
 
-	return nil
+	byteMetadata, err := json.Marshal(rawMetadata)
+	err = json.Unmarshal(byteMetadata, &result)
+	if err != nil {
+		return result, err
+	}
+
+	return result, nil
 }
 
 func (app *App) PrintMetadata(url string) error {