rewrite using IoC and DI

controller/playlist.go

@@ -1,104 +1,34 @@
 package controller
 
 import (
-	"AynaLivePlayer/config"
-	"AynaLivePlayer/player"
-	"AynaLivePlayer/provider"
-	"fmt"
+	"AynaLivePlayer/common/event"
+	"AynaLivePlayer/model"
 )
 
-var UserPlaylist *player.Playlist
-var History *player.Playlist
-var HistoryUser *player.User
-var SystemPlaylist *player.Playlist
-var PlaylistManager []*player.Playlist
-
-func AddToHistory(media *player.Media) {
-	l.Tracef("add media %s (%s) to history", media.Title, media.Artist)
-	media = media.Copy()
-	// reset url for future use
-	media.Url = ""
-	if History.Size() >= 1024 {
-		History.Replace([]*player.Media{})
-	}
-	History.Push(media)
-	return
+type IPlaylistController interface {
+	Size() int
+	GetHistory() IPlaylist
+	AddToHistory(media *model.Media)
+	GetDefault() IPlaylist
+	GetCurrent() IPlaylist
+	Get(index int) IPlaylist
+	Add(pname string, uri string) IPlaylist
+	Remove(index int) IPlaylist
+	SetDefault(index int) error
+	PreparePlaylistByIndex(index int) error
 }
 
-func ToHistoryMedia(media *player.Media) *player.Media {
-	media = media.Copy()
-	media.User = HistoryUser
-	return media
-}
-
-func ToSystemMedia(media *player.Media) *player.Media {
-	media = media.Copy()
-	media.User = player.SystemUser
-	return media
-}
-
-func AddPlaylist(pname string, uri string) *player.Playlist {
-	l.Infof("try add playlist %s with provider %s", uri, pname)
-	id, err := provider.FormatPlaylistUrl(pname, uri)
-	if err != nil || id == "" {
-		l.Warnf("fail to format %s playlist id for %s", uri, pname)
-		return nil
-	}
-	p := player.NewPlaylist(fmt.Sprintf("%s-%s", pname, id), player.PlaylistConfig{})
-	p.Meta = provider.Meta{
-		Name: pname,
-		Id:   id,
-	}
-	PlaylistManager = append(PlaylistManager, p)
-	config.Player.Playlists = append(config.Player.Playlists, &config.PlayerPlaylist{
-		ID:       uri,
-		Provider: pname,
-	})
-	return p
-}
-
-func RemovePlaylist(index int) {
-	l.Infof("Try to remove playlist.index=%d", index)
-	if index < 0 || index >= len(PlaylistManager) {
-		l.Warnf("playlist.index=%d not found", index)
-		return
-	}
-	if index == config.Player.PlaylistIndex {
-		l.Info("Delete current system playlist, reset system playlist to index = 0")
-		SetSystemPlaylist(0)
-	}
-	if index < config.Player.PlaylistIndex {
-		l.Debugf("Delete playlist before system playlist (index=%d), reduce system playlist index by 1", config.Player.PlaylistIndex)
-		config.Player.PlaylistIndex = config.Player.PlaylistIndex - 1
-	}
-	PlaylistManager = append(PlaylistManager[:index], PlaylistManager[index+1:]...)
-	config.Player.Playlists = append(config.Player.Playlists[:index], config.Player.Playlists[index+1:]...)
-}
-
-func SetSystemPlaylist(index int) {
-	l.Infof("try set system playlist to playlist.id=%d", index)
-	if index < 0 || index >= len(PlaylistManager) {
-		l.Warn("playlist.index=%d not found", index)
-		return
-	}
-	err := PreparePlaylist(PlaylistManager[index])
-	if err != nil {
-		return
-	}
-	medias := PlaylistManager[index].Playlist
-	config.Player.PlaylistIndex = index
-	ApplyUser(medias, player.PlaylistUser)
-	SystemPlaylist.Replace(medias)
-}
-
-func PreparePlaylistByIndex(index int) {
-	l.Infof("try prepare playlist.id=%d", index)
-	if index < 0 || index >= len(PlaylistManager) {
-		l.Warn("playlist.id=%d not found", index)
-		return
-	}
-	err := PreparePlaylist(PlaylistManager[index])
-	if err != nil {
-		return
-	}
+type IPlaylist interface {
+	Model() *model.Playlist // mutable model (not a copy)
+	EventManager() *event.Manager
+	Name() string
+	Size() int
+	Get(index int) *model.Media
+	Pop() *model.Media
+	Replace(medias []*model.Media)
+	Push(media *model.Media)
+	Insert(index int, media *model.Media)
+	Delete(index int) *model.Media
+	Move(src int, dst int)
+	Next() *model.Media
 }