add possibility to backup and restore local playlists

app/src/main/java/com/github/libretube/db/obj/LocalPlaylistItem.kt

@@ -7,7 +7,7 @@ import androidx.room.PrimaryKey
 @Entity
 data class LocalPlaylistItem(
     @PrimaryKey(autoGenerate = true) val id: Int = 0,
-    @ColumnInfo val playlistId: Int,
+    @ColumnInfo var playlistId: Int,
     @ColumnInfo val videoId: String,
     @ColumnInfo val title: String? = null,
     @ColumnInfo val uploadDate: String? = null,

app/src/main/java/com/github/libretube/obj/BackupFile.kt

@@ -1,6 +1,7 @@
 package com.github.libretube.obj
 
 import com.github.libretube.db.obj.CustomInstance
+import com.github.libretube.db.obj.LocalPlaylistWithVideos
 import com.github.libretube.db.obj.LocalSubscription
 import com.github.libretube.db.obj.PlaylistBookmark
 import com.github.libretube.db.obj.SearchHistoryItem
@@ -14,5 +15,6 @@ data class BackupFile(
     var localSubscriptions: List<LocalSubscription>? = null,
     var customInstances: List<CustomInstance>? = null,
     var playlistBookmarks: List<PlaylistBookmark>? = null,
+    var localPlaylists: List<LocalPlaylistWithVideos>? = null,
     var preferences: List<PreferenceItem>? = null
 )

app/src/main/java/com/github/libretube/ui/dialogs/BackupDialog.kt

@@ -40,6 +40,10 @@ class BackupDialog(
             it.playlistBookmarks = Database.playlistBookmarkDao().getAll()
         })
 
+        object LocalPlaylists : BackupOption(R.string.local_playlists, onSelected = {
+            it.localPlaylists = Database.localPlaylistsDao().getAll()
+        })
+
         object Preferences : BackupOption(R.string.preferences, onSelected = {
             it.preferences = PreferenceHelper.settings.all.map {
                 PreferenceItem(it.key, it.value)
@@ -54,6 +58,7 @@ class BackupDialog(
             BackupOption.LocalSubscriptions,
             BackupOption.CustomInstances,
             BackupOption.PlaylistBookmarks,
+            BackupOption.LocalPlaylists,
             BackupOption.Preferences
         )
 

app/src/main/java/com/github/libretube/util/BackupHelper.kt

@@ -66,6 +66,15 @@ class BackupHelper(private val context: Context) {
                 *backupFile.playlistBookmarks.orEmpty().toTypedArray()
             )
 
+            backupFile.localPlaylists?.forEach {
+                Database.localPlaylistsDao().createPlaylist(it.playlist)
+                val playlistId = Database.localPlaylistsDao().getAll().last().playlist.id
+                it.videos.forEach {
+                    it.playlistId = playlistId
+                    Database.localPlaylistsDao().addPlaylistVideo(it)
+                }
+            }
+
             restorePreferences(backupFile.preferences)
         }
     }

app/src/main/res/values/strings.xml

@@ -386,6 +386,7 @@
     <string name="clear_bookmarks">Clear bookmarks</string>
     <string name="bookmarks_empty">No bookmarks yet!</string>
     <string name="queue_insert_related_videos">Insert related videos</string>
+    <string name="local_playlists">Local playlists</string>
 
     <!-- Notification channel strings -->
     <string name="download_channel_name">Download Service</string>