// ReadSpotifyPlaylist reads spotify playlist into list of tracks
func ReadSpotifyPlaylist(spotifyClient *spotify.Client, uri string) (tracks []Track, playlistName string, err error) {
// Fetch playlist
playlist, err := spotifyClient.GetPlaylist(ParseSpotifyUri(uri))
if err != nil {
return
}
playlistName = playlist.Name
// Convert to tracks
tracks = make([]Track, len(playlist.Tracks.Tracks))
for i, x := range playlist.Tracks.Tracks {
// Artists
artistStrings := make([]string, len(x.Track.Artists))
for k, x := range x.Track.Artists {
artistStrings[k] = x.Name
}
if artistStrings == nil {
err = errors.New("empty artist in track")
return
}
// Store in slice
tracks[i] = Track{
x.Track.Name,
x.Track.Album.Name,
artistStrings[0], // All tracks has at least one artist
artistStrings,
}
}
return
}
func addTracksToPlaylist(client *spotify.Client, user *spotify.PrivateUser, playlist *spotify.SimplePlaylist, trackIDs []spotify.ID) error {
allTracks := make(map[spotify.ID]spotify.FullTrack)
limit := 100
offset := 0
var options spotify.Options
options.Limit = &limit
options.Offset = &offset
for {
tracksPage, err := client.GetPlaylistTracksOpt(user.ID, playlist.ID, &options, "")
if err != nil {
return err
}
log.Printf("Playlist %v: fetched page of %v track(s)", playlist.Name, len(tracksPage.Tracks))
for _, playlistTrack := range tracksPage.Tracks {
track := playlistTrack.Track
allTracks[track.ID] = track
}
// The Spotify API always returns full pages unless it has none left to
// return.
if len(tracksPage.Tracks) < 100 {
break
}
offset = offset + len(tracksPage.Tracks)
}
log.Printf("Playlist %v: %v track(s)", playlist.Name, len(allTracks))
var trackIDsToAdd []spotify.ID
for _, id := range trackIDs {
if _, ok := allTracks[id]; !ok {
trackIDsToAdd = append(trackIDs, id)
}
}
log.Printf("Playlist %v: Need to add %v track(s)", playlist.Name,
len(trackIDsToAdd))
for i := 0; i < len(trackIDsToAdd); i += 100 {
bound := i + 100
if bound > len(trackIDsToAdd) {
bound = len(trackIDsToAdd)
}
_, err := client.AddTracksToPlaylist(user.ID, playlist.ID, trackIDsToAdd[i:bound]...)
if err != nil {
return err
}
log.Printf("Playlist %v: added page of %v track(s)", playlist.Name,
len(trackIDsToAdd[i:bound]))
}
return nil
}
func GetTrax(c *spotify.Client, id spotify.ID) ([]spotify.ID, error) {
discTrax, err := c.GetPlaylistTracksOpt("spotifydiscover", id, nil, "items(track(id, name))")
if err != nil {
return nil, errors.New("getplay err: " + err.Error())
}
ids := make([]spotify.ID, 0, len(discTrax.Tracks))
for _, t := range discTrax.Tracks {
fmt.Printf("ID: %v, Name: %v\n", t.Track.ID, t.Track.Name)
ids = append(ids, spotify.ID(t.Track.ID))
}
return ids, nil
}
func getPlaylist(client *spotify.Client, user *spotify.PrivateUser, playlistName string) (*spotify.SimplePlaylist, error) {
page, err := client.CurrentUsersPlaylists()
if err != nil {
return nil, err
}
for _, playlist := range page.Playlists {
if playlist.Name == playlistName {
log.Printf("Found playlist: %v", playlistName)
return &playlist, nil
}
}
// otherwise create a new playlist for the user
log.Printf("Creating playlist: %v", playlistName)
playlist, err := client.CreatePlaylistForUser(user.ID, playlistName, true)
return &playlist.SimplePlaylist, err
}
func MakePlist(c *spotify.Client, id spotify.ID) error {
u, err := c.CurrentUser()
if err != nil {
return errors.New("curuser err: " + err.Error())
}
uid := u.ID
pl, err := c.CreatePlaylistForUser(uid, NewPlistName(), false)
if err != nil {
return errors.New("create error: " + err.Error())
}
ids, err := GetTrax(c, id)
if err != nil {
return errors.New("gettrax err: " + err.Error())
}
snap, err := c.AddTracksToPlaylist(u.ID, pl.ID, ids...)
if err != nil {
return errors.New("addtrax err: " + err.Error())
}
fmt.Println(snap)
return nil
}