fix(Remote playback): kludge to scrub after stream move

src-tauri/src/commands/player/mod.rs

@@ -1249,6 +1249,59 @@ pub(super) fn get_queue_status(controller: &PlayerController) -> QueueStatus {
     }
 }
 
+/// Start a freshly-built queue on the active remote session.
+///
+/// Used by the "play tracks"/"play album track" commands when we're in remote
+/// mode: instead of starting local MPV playback, we cast the selected tracks to
+/// the remote device. Mirrors PlaybackModeManager::transfer_to_remote's
+/// play_on_session call, but for a brand-new selection (so there's no resume
+/// position - playback starts from the chosen track's beginning).
+///
+/// Local-only items (no Jellyfin ID) can't be cast, so they're filtered out and
+/// the start index is adjusted to the remaining Jellyfin items. Returns an error
+/// if the selected track itself has no Jellyfin ID.
+async fn play_selection_on_remote(
+    controller: &PlayerController,
+    session_id: &str,
+    media_items: &[MediaItem],
+    start_index: usize,
+) -> Result<(), String> {
+    // Collect Jellyfin IDs, tracking where the selected track lands after any
+    // local-only items are dropped.
+    let mut jellyfin_ids: Vec<String> = Vec::new();
+    let mut adjusted_index: Option<usize> = None;
+    for (i, item) in media_items.iter().enumerate() {
+        if let Some(id) = item.jellyfin_id() {
+            if i == start_index {
+                adjusted_index = Some(jellyfin_ids.len());
+            }
+            jellyfin_ids.push(id.to_string());
+        }
+    }
+
+    let start_index = adjusted_index
+        .ok_or("Cannot play on remote: selected track is not from Jellyfin")?;
+
+    if jellyfin_ids.is_empty() {
+        return Err("Cannot play on remote: no Jellyfin tracks in selection".to_string());
+    }
+
+    let client = {
+        let client_arc = controller.jellyfin_client();
+        let client_opt = client_arc.lock().map_err(|e| e.to_string())?;
+        client_opt
+            .as_ref()
+            .ok_or("Jellyfin client not configured")?
+            .clone()
+    };
+
+    // Fresh selection: start from the beginning of the chosen track.
+    client
+        .play_on_session(session_id.to_string(), jellyfin_ids, start_index, None)
+        .await
+        .map_err(|e| format!("Failed to start playback on remote session: {}", e))
+}
+
 
 /// Play a track from an album - backend fetches all album tracks and builds queue
 #[tauri::command]
@@ -1258,6 +1311,7 @@ pub async fn player_play_album_track(
     session: State<'_, MediaSessionManagerWrapper>,
     db: State<'_, DatabaseWrapper>,
     repository_manager: State<'_, super::repository::RepositoryManagerWrapper>,
+    playback_mode: State<'_, super::playback_mode::PlaybackModeManagerWrapper>,
     repository_handle: String,
     request: PlayAlbumTrackRequest,
 ) -> Result<PlayerStatus, String> {
@@ -1380,11 +1434,24 @@ pub async fn player_play_album_track(
         session_mgr.start_audio_session(first_item.clone());
     }
 
-    // Play the queue
     let controller = player.0.lock().await;
-    controller
-        .play_queue(media_items, start_index)
-        .map_err(|e| e.to_string())?;
+
+    // When controlling a remote session, cast the selection there instead of
+    // starting local MPV playback. We still load the queue locally (below) so
+    // the queue/context stay in sync for the UI and for transferring back.
+    let remote_session = match playback_mode.0.get_mode() {
+        crate::playback_mode::PlaybackMode::Remote { session_id } => Some(session_id),
+        _ => None,
+    };
+
+    if let Some(session_id) = &remote_session {
+        play_selection_on_remote(&controller, session_id, &media_items, start_index).await?;
+        controller.set_queue(media_items, start_index).map_err(|e| e.to_string())?;
+    } else {
+        controller
+            .play_queue(media_items, start_index)
+            .map_err(|e| e.to_string())?;
+    }
 
     // Set the queue context for remote transfer
     {
@@ -1426,6 +1493,7 @@ pub async fn player_play_tracks(
     session: State<'_, MediaSessionManagerWrapper>,
     db: State<'_, DatabaseWrapper>,
     repository_manager: State<'_, super::repository::RepositoryManagerWrapper>,
+    playback_mode: State<'_, super::playback_mode::PlaybackModeManagerWrapper>,
     repository_handle: String,
     request: PlayTracksRequest,
 ) -> Result<PlayerStatus, String> {
@@ -1533,10 +1601,33 @@ pub async fn player_play_tracks(
         session_mgr.start_audio_session(first_item.clone());
     }
 
-    // Play queue
     let controller = player.0.lock().await;
-    controller.play_queue_from(media_items, request.start_index, request.start_position)
-        .map_err(|e| e.to_string())?;
+
+    // When controlling a remote session, cast the selection there instead of
+    // starting local MPV playback. Skip this while a transfer is in flight: the
+    // transfer-to-local path calls this command to load the queue locally and
+    // the mode is still Remote until the transfer completes - routing it back to
+    // the remote would undo the transfer.
+    let remote_session = match playback_mode.0.get_mode() {
+        crate::playback_mode::PlaybackMode::Remote { session_id }
+            if !playback_mode.0.is_transferring() =>
+        {
+            Some(session_id)
+        }
+        _ => None,
+    };
+
+    if let Some(session_id) = &remote_session {
+        play_selection_on_remote(&controller, session_id, &media_items, request.start_index)
+            .await?;
+        controller
+            .set_queue(media_items, request.start_index)
+            .map_err(|e| e.to_string())?;
+    } else {
+        controller
+            .play_queue_from(media_items, request.start_index, request.start_position)
+            .map_err(|e| e.to_string())?;
+    }
 
     // Set queue context
     {