fix: make feed notifications robust against subscription changes

app/src/main/java/com/github/libretube/constants/PreferenceKeys.kt

@@ -140,11 +140,13 @@ object PreferenceKeys {
 
     // Internally saved data / not a preference
     const val ERROR_LOG = "error_log"
-    const val LAST_STREAM_VIDEO_ID = "last_stream_video_id"
-    const val LAST_WATCHED_FEED_TIME = "last_watched_feed_time"
     const val AUTH_PREF_FILE = "auth"
     const val IMAGE_PROXY_URL = "image_proxy_url"
     const val SELECTED_CHANNEL_GROUP = "selected_channel_group"
     const val SELECTED_DOWNLOAD_SORT_TYPE = "selected_download_sort_type"
     const val LAST_SHOWN_INFO_MESSAGE_VERSION_CODE = "last_shown_info_message_version"
+
+    // use the helper methods at PreferenceHelper to access these
+    const val LAST_USER_SEEN_FEED_TIME = "last_watched_feed_time"
+    const val LAST_REFRESHED_FEED_TIME = "last_refreshed_feed_time"
 }

app/src/main/java/com/github/libretube/helpers/PreferenceHelper.kt

@@ -96,24 +96,24 @@ object PreferenceHelper {
         authSettings.edit { putString(PreferenceKeys.USERNAME, newValue) }
     }
 
-    fun setLastSeenVideoId(videoId: String) {
+    fun updateLastFeedWatchedTime(time: Long, seenByUser: Boolean) {
-        putString(PreferenceKeys.LAST_STREAM_VIDEO_ID, videoId)
-    }
-
-    fun getLastSeenVideoId(): String {
-        return getString(PreferenceKeys.LAST_STREAM_VIDEO_ID, "")
-    }
-
-    fun updateLastFeedWatchedTime(time: Long) {
         // only update the time if the time is newer
         // this avoids cases, where the user last saw an older video, which had already been seen,
         // causing all following video to be incorrectly marked as unseen again
-        if (getLastCheckedFeedTime() < time)
+        if (getLastCheckedFeedTime(false) < time)
-            putLong(PreferenceKeys.LAST_WATCHED_FEED_TIME, time)
+            putLong(PreferenceKeys.LAST_REFRESHED_FEED_TIME, time)
+
+        // this value holds the last time the user opened the subscriptions feed
+        // whereas [LAST_REFRESHED_FEED_TIME] considers the last time the feed was loaded,
+        // which could also be possible in the background (e.g. via notifications)
+        if (seenByUser && getLastCheckedFeedTime(true) < time)
+            putLong(PreferenceKeys.LAST_USER_SEEN_FEED_TIME, time)
     }
 
-    fun getLastCheckedFeedTime(): Long {
+    fun getLastCheckedFeedTime(seenByUser: Boolean): Long {
-        return getLong(PreferenceKeys.LAST_WATCHED_FEED_TIME, 0)
+        val key =
+            if (seenByUser) PreferenceKeys.LAST_USER_SEEN_FEED_TIME else PreferenceKeys.LAST_REFRESHED_FEED_TIME
+        return getLong(key, 0)
     }
 
     fun saveErrorLog(log: String) {

app/src/main/java/com/github/libretube/ui/activities/MainActivity.kt

@@ -37,7 +37,6 @@ import com.github.libretube.constants.IntentData
 import com.github.libretube.constants.PreferenceKeys
 import com.github.libretube.databinding.ActivityMainBinding
 import com.github.libretube.enums.ImportFormat
-import com.github.libretube.extensions.toID
 import com.github.libretube.helpers.ImportHelper
 import com.github.libretube.helpers.IntentHelper
 import com.github.libretube.helpers.NavBarHelper
@@ -240,9 +239,12 @@ class MainActivity : BaseActivity() {
         subscriptionsViewModel.fetchSubscriptions(this)
 
         subscriptionsViewModel.videoFeed.observe(this) { feed ->
+            val lastCheckedFeedTime = PreferenceHelper.getLastCheckedFeedTime(seenByUser = true)
             val lastSeenVideoIndex = feed.orEmpty()
-                .indexOfFirst { PreferenceHelper.getLastSeenVideoId() == it.url?.toID() }
+                .filter { !it.isUpcoming }
+                .indexOfFirst { it.uploaded <= lastCheckedFeedTime }
             if (lastSeenVideoIndex < 1) return@observe
+
             binding.bottomNav.getOrCreateBadge(R.id.subscriptionsFragment).apply {
                 number = lastSeenVideoIndex
                 backgroundColor = ThemeHelper.getThemeColor(

app/src/main/java/com/github/libretube/ui/fragments/SubscriptionsFragment.kt

@@ -140,13 +140,17 @@ class SubscriptionsFragment : DynamicLayoutManagerFragment(R.layout.fragment_sub
         // any other feed updates are caused by manual refreshing and thus should reset the scroll
         // position to zero
         var alreadyShowedFeedOnce = false
-        viewModel.videoFeed.observe(viewLifecycleOwner) {
+        viewModel.videoFeed.observe(viewLifecycleOwner) { feed ->
-            if (!viewModel.isCurrentTabSubChannels && it != null) {
+            if (!viewModel.isCurrentTabSubChannels && feed != null) {
                 lifecycleScope.launch {
                     showFeed(!alreadyShowedFeedOnce)
                 }
                 alreadyShowedFeedOnce = true
             }
+
+           feed?.firstOrNull { !it.isUpcoming }?.uploaded?.let {
+                PreferenceHelper.updateLastFeedWatchedTime(it, true)
+            }
         }
 
         // restore the scroll position, same conditions as above
@@ -384,7 +388,7 @@ class SubscriptionsFragment : DynamicLayoutManagerFragment(R.layout.fragment_sub
 
         // add an "all caught up item"
         if (selectedSortOrder == 0) {
-            val lastCheckedFeedTime = PreferenceHelper.getLastCheckedFeedTime()
+            val lastCheckedFeedTime = PreferenceHelper.getLastCheckedFeedTime(seenByUser = true)
             val caughtUpIndex =
                 feed.indexOfFirst { it.uploaded <= lastCheckedFeedTime && !it.isUpcoming }
             if (caughtUpIndex > 0 && !feed[caughtUpIndex - 1].isUpcoming) {
@@ -404,10 +408,6 @@ class SubscriptionsFragment : DynamicLayoutManagerFragment(R.layout.fragment_sub
 
         binding.toggleSubs.text = getString(R.string.subscriptions)
 
-        feed.firstOrNull { !it.isUpcoming }?.uploaded?.let {
-            PreferenceHelper.updateLastFeedWatchedTime(it)
-        }
-
         binding.subRefresh.isRefreshing = false
 
         feedAdapter.submitList(sortedFeed) {

app/src/main/java/com/github/libretube/ui/models/SubscriptionsViewModel.kt

@@ -11,7 +11,6 @@ import com.github.libretube.api.SubscriptionHelper
 import com.github.libretube.api.obj.StreamItem
 import com.github.libretube.api.obj.Subscription
 import com.github.libretube.extensions.TAG
-import com.github.libretube.extensions.toID
 import com.github.libretube.extensions.toastFromMainDispatcher
 import com.github.libretube.helpers.PreferenceHelper
 import com.github.libretube.repo.FeedProgress
@@ -41,9 +40,8 @@ class SubscriptionsViewModel : ViewModel() {
                 return@launch
             }
             this@SubscriptionsViewModel.videoFeed.postValue(videoFeed)
-            if (videoFeed.isNotEmpty()) {
+            videoFeed.firstOrNull { !it.isUpcoming }?.uploaded?.let {
-                // save the last recent video to the prefs for the notification worker
+                PreferenceHelper.updateLastFeedWatchedTime(it, false)
-                PreferenceHelper.setLastSeenVideoId(videoFeed[0].url!!.toID())
             }
         }
     }

app/src/main/java/com/github/libretube/workers/NotificationWorker.kt

@@ -83,18 +83,15 @@ class NotificationWorker(appContext: Context, parameters: WorkerParameters) :
         val videoFeed = try {
             withContext(Dispatchers.IO) {
                 SubscriptionHelper.getFeed(forceRefresh = true)
-            }
+            }.filter { !it.isUpcoming }
         } catch (e: Exception) {
             return false
         }
 
-        val lastUserSeenVideoId = PreferenceHelper.getLastSeenVideoId()
+        val lastFeedCheckMillis = PreferenceHelper.getLastCheckedFeedTime(seenByUser = false)
-        val mostRecentStreamId = videoFeed.firstOrNull()?.url?.toID() ?: return true
-        // save the latest streams that got notified about
-        PreferenceHelper.setLastSeenVideoId(mostRecentStreamId)
 
         // first time notifications are enabled or no new video available
-        if (lastUserSeenVideoId.isEmpty() || lastUserSeenVideoId == mostRecentStreamId) return true
+        if (lastFeedCheckMillis == 0L || videoFeed.none { it.uploaded > lastFeedCheckMillis }) return true
 
         val channelsToIgnore = PreferenceHelper.getIgnorableNotificationChannels()
         val enableShortsNotification =
@@ -102,7 +99,7 @@ class NotificationWorker(appContext: Context, parameters: WorkerParameters) :
 
         val channelGroups = videoFeed.asSequence()
             // filter the new videos until the last seen video in the feed
-            .takeWhile { it.url!!.toID() != lastUserSeenVideoId }
+            .filter { it.uploaded > lastFeedCheckMillis }
             // don't show notifications for shorts videos if not enabled
             .filter { enableShortsNotification || !it.isShort }
             // hide for notifications unsubscribed channels
@@ -110,6 +107,9 @@ class NotificationWorker(appContext: Context, parameters: WorkerParameters) :
             // group the new streams by the uploader
             .groupBy { it.uploaderUrl!!.toID() }
 
+        // update the last feed check time in order to not show the same notification again
+        PreferenceHelper.updateLastFeedWatchedTime(videoFeed.first().uploaded, seenByUser = false)
+
         // return if the previous video didn't get found or all the channels have notifications disabled
         if (channelGroups.isEmpty()) return true
 
@@ -226,6 +226,6 @@ class NotificationWorker(appContext: Context, parameters: WorkerParameters) :
 
     companion object {
         private const val INTENT_FLAGS = Intent.FLAG_ACTIVITY_CLEAR_TOP or
-            Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
+                Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
     }
 }