Move torrents to completed after finish

proto/torrent.proto

@@ -19,12 +19,21 @@ service Torrents {
   // from the subscribe point onward — no history is replayed. New subscribers
   // only see events that fire after they connect.
   rpc Notifications(NotificationsRequest) returns (stream Notification);
+
+  // List the files inside a torrent with their download progress. Returns
+  // NOT_FOUND if the torrent is unknown or its metadata has not resolved yet
+  // (e.g. a magnet link still fetching peers).
+  rpc Files(FilesRequest) returns (FilesResponse);
 }
 
 message AddRequest {
   string magnet = 1;
-  // Optional output directory override. Empty means use torad's default.
-  string output_dir = 2;
+  // Folder to download into. Empty = daemon default
+  // (<download_dir>/<torrent_name>/ for multi-file torrents).
+  string download_folder = 2;
+  // Folder to move the torrent into after completion. Empty = daemon default
+  // (<download_dir>/completed/<torrent_name>/).
+  string move_after_completion_folder = 3;
 }
 
 message AddResponse {
@@ -69,6 +78,31 @@ message NotificationsRequest {
   repeated NotificationKind kinds = 2;
 }
 
+message FilesRequest {
+  string id = 1;
+}
+
+enum FileState {
+  FILE_STATE_UNSPECIFIED = 0;
+  // File is partially downloaded.
+  IN_PROGRESS = 1;
+  // File's full byte range has been verified.
+  READY = 2;
+}
+
+message TorrentFile {
+  // Path relative to the torrent root, as declared in the .torrent metadata.
+  // May contain forward slashes for multi-file torrents.
+  string name = 1;
+  uint64 length = 2;
+  uint64 downloaded_bytes = 3;
+  FileState state = 4;
+}
+
+message FilesResponse {
+  repeated TorrentFile files = 1;
+}
+
 message Notification {
   // Wall-clock time the daemon observed the change, in milliseconds since the
   // Unix epoch.