fix: indexing of beat annotations after unpaired tracks

app/src/main/java/at/lockstep/player/LockstepViewModel.kt

@@ -192,7 +192,7 @@ class LockstepViewModel(
                     context = appContext,
                     sessionFolder = sessionFolder,
                     playlistDisplayName = playlistDisplayName,
-                    trackQueueIndex0Based = event.queueIndex,
+                    trackQueueIndex0Based = event.playlistPosition,
                     contentId = contentId,
                     title = event.title,
                     artist = event.artist,
@@ -207,7 +207,7 @@ class LockstepViewModel(
                 BeatAnnotationStorage.writeBeatsFile(
                     context = appContext,
                     playlistDisplayName = playlistDisplayName,
-                    trackQueueIndex0Based = event.queueIndex,
+                    trackQueueIndex0Based = event.playlistPosition,
                     contentId = contentId,
                     title = event.title,
                     artist = event.artist,
@@ -278,7 +278,7 @@ class LockstepViewModel(
             writeRunDataAndRecordMetadata(
                 runSessionFolder = runSessionFolder,
                 playlistDisplayName = playlistDisplayName,
-                trackQueueIndex0Based = event.queueIndex,
+                trackQueueIndex0Based = event.playlistPosition,
                 trackId = event.trackId,
                 metaContentUri = meta,
                 title = event.title,
@@ -296,7 +296,7 @@ class LockstepViewModel(
         trackId: String,
         title: String,
         artist: String,
-        queueIndex: Int,
+        playlistPosition: Int,
         snapshot: RunTrackDataSnapshot,
     ) {
         if (snapshot.isEmpty()) {
@@ -308,7 +308,7 @@ class LockstepViewModel(
             writeRunDataAndRecordMetadata(
                 runSessionFolder = runSessionFolder,
                 playlistDisplayName = playlistDisplayName,
-                trackQueueIndex0Based = queueIndex,
+                trackQueueIndex0Based = playlistPosition,
                 trackId = trackId,
                 metaContentUri = meta,
                 title = title,

app/src/main/java/at/lockstep/player/playback/PlaybackService.kt

@@ -110,6 +110,7 @@ class PlaybackService : Service() {
                             title = item.title,
                             artist = item.artist,
                             queueIndex = i,
+                            playlistPosition = item.playlistPosition,
                             queueSize = queue.size,
                             reason = reason,
                     ),
@@ -265,6 +266,7 @@ class PlaybackService : Service() {
                         artist = row.artistName ?: "—",
                         localUri = Uri.parse(uriStr),
                         durationMsHint = hint,
+                        playlistPosition = row.position,
                     )
                 }
             index = 0
@@ -300,6 +302,7 @@ class PlaybackService : Service() {
                 isPlaying = _uiState.value.isPlaying,
                 currentTrackId = item.id,
                 currentQueueIndex = index,
+                currentPlaylistPosition = item.playlistPosition,
                 queueSize = queue.size,
             )
         updateProgressFromEngine()
@@ -367,6 +370,8 @@ class PlaybackService : Service() {
                 durationSeconds = durationSec,
                 currentTrackId = queue.getOrNull(index)?.id ?: _uiState.value.currentTrackId,
                 currentQueueIndex = index,
+                currentPlaylistPosition =
+                    queue.getOrNull(index)?.playlistPosition ?: _uiState.value.currentPlaylistPosition,
                 queueSize = queue.size,
             )
         updatePlaybackStateFromEngine()
@@ -566,6 +571,8 @@ class PlaybackService : Service() {
         val isPlaying: Boolean,
         val currentTrackId: String?,
         val currentQueueIndex: Int,
+        /** 0-based position in the full Spotify playlist for the current track. */
+        val currentPlaylistPosition: Int,
         val queueSize: Int,
     ) {
         companion object {
@@ -578,6 +585,7 @@ class PlaybackService : Service() {
                     isPlaying = false,
                     currentTrackId = null,
                     currentQueueIndex = 0,
+                    currentPlaylistPosition = 0,
                     queueSize = 0,
                 )
         }
@@ -590,6 +598,8 @@ class PlaybackService : Service() {
         val localUri: Uri?,
         /** Fallback when the engine has not reported duration yet (from jukebox or default). */
         val durationMsHint: Int,
+        /** 0-based position in the full Spotify playlist. */
+        val playlistPosition: Int,
     )
 
     companion object {

app/src/main/java/at/lockstep/player/playback/TrackBoundaryEvent.kt

@@ -8,8 +8,10 @@ data class TrackBoundaryEvent(
     val trackId: String,
     val title: String,
     val artist: String,
-    /** 0-based index in the current play queue when this track was current. */
+    /** 0-based index in the paired-only play queue when this track was current. */
     val queueIndex: Int,
+    /** 0-based position in the full Spotify playlist (used for beat/run-data file slots). */
+    val playlistPosition: Int,
     val queueSize: Int,
     val reason: TrackBoundaryReason,
 )

app/src/main/java/at/lockstep/player/ui/NowPlayingScreen.kt

@@ -196,7 +196,7 @@ fun NowPlayingRoute(
     }
     var playlistDisplayName by remember { mutableStateOf("playlist") }
     var currentTrackId by remember { mutableStateOf<String?>(null) }
-    var currentQueueIndex by remember { mutableIntStateOf(0) }
+    var currentPlaylistPosition by remember { mutableIntStateOf(0) }
 
     var ui by remember {
         mutableStateOf(
@@ -221,7 +221,7 @@ fun NowPlayingRoute(
         val service = playback ?: return@LaunchedEffect
         service.uiState.collect { p ->
             currentTrackId = p.currentTrackId
-            currentQueueIndex = p.currentQueueIndex
+            currentPlaylistPosition = p.currentPlaylistPosition
             ui =
                 NowPlayingUiState(
                     title = p.title,
@@ -285,7 +285,7 @@ fun NowPlayingRoute(
                         trackId = trackId,
                         title = ui.title,
                         artist = ui.artist,
-                        queueIndex = currentQueueIndex,
+                        playlistPosition = currentPlaylistPosition,
                         snapshot = snapshot,
                     )
                 }