fix: check file existance before fetching metadata

lib/download.go

@@ -75,30 +75,36 @@ func (app *App) DownloadPlaylist(url string, outputFile string, service string,
 		return err
 	}
 
-	var urls []string
-	for _, item := range playlist.Data.Playlist.Content.Items {
-		url, err := SpotifyUriToLink(item.Item.Data.Uri)
+	playlistItems := playlist.GetPlaylistItems()
+	trackListSize := len(playlistItems)
+	for idx, item := range playlistItems {
+		artists := item.GetArtists()
+		fileName := outputFile + fmt.Sprintf(FILE_NAME_FORMAT, item.Item.Data.IdentityTrait.Name, artists, "flac")
+
+		fmt.Println("[" + strconv.Itoa(idx+1) + "/" + strconv.Itoa(trackListSize) + "] " + item.Item.Data.IdentityTrait.Name + " - " + artists)
+
+		songExists, err := FileExists(fileName)
 		if err != nil {
-			return err
+			if app.StopOnFail {
+				return err
+			}
+			continue
 		}
 
-		urls = append(urls, url)
-	}
+		if songExists && !app.OverrideDownload {
+			app.log("Song " + fileName + " already exists")
+			continue
+		}
 
-	trackListSize := len(urls)
-	for idx, url := range urls {
+		url, err := SpotifyUriToLink(item.Item.Data.Uri)
 		metadata, err := app.GetTrackMetadata(url)
 		if err != nil {
-			return err
+			if app.StopOnFail {
+				return err
+			}
+			continue
 		}
 
-		artists, err := GetArtists(metadata)
-		if err != nil {
-			return err
-		}
-
-		fmt.Println("[" + strconv.Itoa(idx+1) + "/" + strconv.Itoa(trackListSize) + "] " + metadata.Data.TrackUnion.Name + " - " + artists)
-
 		if err := app.DownloadTrack(url, outputFile+"/", service, quality, true, metadata); err != nil {
 			if app.StopOnFail {
 				return err

lib/types.go

@@ -130,17 +130,8 @@ type PlaylistMetadata struct {
 			Name    string `json:"name"`
 			Uri     string `json:"uri"`
 			Content struct {
-				TotalCount int `json:"totalCount"`
-				Items      []struct {
-					Item struct {
-						Data struct {
-							IdentityTrait struct {
-								Name string `json:"name"`
-							} `json:"identityTrait"`
-							Uri string `json:"uri"`
-						} `json:"data"`
-					} `json:"itemV3"`
-				} `json:"items"`
+				TotalCount int             `json:"totalCount"`
+				Items      []PlaylistItems `json:"items"`
 			} `json:"content"`
 			Members struct {
 				Items []struct {
@@ -155,3 +146,37 @@ type PlaylistMetadata struct {
 		} `json:"playlistV2"`
 	} `json:"data"`
 }
+
+type PlaylistItems struct {
+	Item struct {
+		Data struct {
+			IdentityTrait struct {
+				Name         string `json:"name"`
+				Contributors struct {
+					Items []struct {
+						Name string `json:"name"`
+					}
+				} `json:"contributors"`
+			} `json:"identityTrait"`
+			Uri string `json:"uri"`
+		} `json:"data"`
+	} `json:"itemV3"`
+}
+
+func (metadata *PlaylistMetadata) GetPlaylistItems() []PlaylistItems {
+	return metadata.Data.Playlist.Content.Items
+}
+
+func (playlistItem *PlaylistItems) GetArtists() string {
+	var result = ""
+	for idx, artist := range playlistItem.Item.Data.IdentityTrait.Contributors.Items {
+		if idx == len(playlistItem.Item.Data.IdentityTrait.Contributors.Items)-1 {
+			result += artist.Name
+			continue
+		}
+
+		result += artist.Name + ", "
+	}
+
+	return result
+}

lib/utils.go

@@ -46,6 +46,8 @@ func ParseTrackId(url string) (string, error) {
 	return tmp2[0], nil
 }
 
+const FILE_NAME_FORMAT = "%s - %s.%s"
+
 func BuildFileName(metadata TrackMetadata, extension string) (string, error) {
 	var result string
 
@@ -54,7 +56,7 @@ func BuildFileName(metadata TrackMetadata, extension string) (string, error) {
 		return result, err
 	}
 
-	result = fmt.Sprintf("%s - %s.%s", metadata.Data.TrackUnion.Name, artists, extension)
+	result = fmt.Sprintf(FILE_NAME_FORMAT, metadata.Data.TrackUnion.Name, artists, extension)
 
 	return result, nil
 }