refactor: Return a better default for lastEventReceivedTime

lib/matrix_api_lite/model/event_types.dart

@@ -61,6 +61,10 @@ abstract class EventTypes {
       'org.matrix.call.asserted_identity';
   static const String Unknown = 'm.unknown';
 
+  /// An internal event type indicating that the last event in the room for
+  /// a room list preview is currently being refreshed.
+  static const String refreshingLastEvent = 'com.famedly.refreshing_last_event';
+
   // To device event types
   static const String RoomKey = 'm.room_key';
   static const String ForwardedRoomKey = 'm.forwarded_room_key';

lib/src/client.dart

@@ -2740,13 +2740,25 @@ class Client extends MatrixApi {
         Logs().d('Skip store LeftRoomUpdate for unknown room', id);
         continue;
       }
-      await database.storeRoomUpdate(id, syncRoomUpdate, room.lastEvent, this);
 
       if (syncRoomUpdate is JoinedRoomUpdate &&
-          syncRoomUpdate.timeline?.limited == true &&
-          room.lastEvent == null) {
+          (room.lastEvent?.type == EventTypes.refreshingLastEvent ||
+              (syncRoomUpdate.timeline?.limited == true &&
+                  room.lastEvent == null))) {
+        room.lastEvent = Event(
+          originServerTs:
+              syncRoomUpdate.timeline?.events?.firstOrNull?.originServerTs ??
+                  DateTime.now(),
+          type: EventTypes.refreshingLastEvent,
+          content: {'body': 'Refreshing last event...'},
+          room: room,
+          eventId: generateUniqueTransactionId(),
+          senderId: userID!,
+        );
         runInRoot(room.refreshLastEvent);
       }
+
+      await database.storeRoomUpdate(id, syncRoomUpdate, room.lastEvent, this);
     }
   }
 

lib/src/room.dart

@@ -379,19 +379,37 @@ class Room {
 
   /// Fetches the most recent event in the timeline from the server to have
   /// a valid preview after receiving a limited timeline from the sync. Will
-  /// be triggered by the sync loop on demand.
-  Future<Event?> refreshLastEvent() async {
+  /// be triggered by the sync loop on demand. Multiple requests will be
+  /// combined to the same request.
+  Future<Event?> refreshLastEvent({
+    timeout = const Duration(seconds: 30),
+  }) async {
+    final lastEvent = _refreshingLastEvent ??= _refreshLastEvent();
+    _refreshingLastEvent = null;
+    return lastEvent;
+  }
+
+  Future<Event?>? _refreshingLastEvent;
+
+  Future<Event?> _refreshLastEvent({
+    timeout = const Duration(seconds: 30),
+  }) async {
     if (membership != Membership.join) return null;
 
     final filter = StateFilter(types: client.roomPreviewLastEvents.toList());
-    final result = await client.getRoomEvents(
-      id,
-      Direction.b,
-      limit: 1,
-      filter: jsonEncode(filter.toJson()),
-    );
+    final result = await client
+        .getRoomEvents(
+          id,
+          Direction.b,
+          limit: 1,
+          filter: jsonEncode(filter.toJson()),
+        )
+        .timeout(timeout);
     final matrixEvent = result.chunk.firstOrNull;
     if (matrixEvent == null) {
+      if (lastEvent?.type == EventTypes.refreshingLastEvent) {
+        lastEvent = null;
+      }
       Logs().d('No last event found for room', id);
       return null;
     }
@@ -492,8 +510,16 @@ class Room {
   String get displayname => getLocalizedDisplayname();
 
   /// When was the last event received.
-  DateTime get latestEventReceivedTime =>
-      lastEvent?.originServerTs ?? DateTime.now();
+  DateTime get latestEventReceivedTime {
+    final lastEventTime = lastEvent?.originServerTs;
+    if (lastEventTime != null) return lastEventTime;
+
+    if (membership == Membership.invite) return DateTime.now();
+    final createEvent = getState(EventTypes.RoomCreate);
+    if (createEvent is MatrixEvent) return createEvent.originServerTs;
+
+    return DateTime(0);
+  }
 
   /// Call the Matrix API to change the name of this room. Returns the event ID of the
   /// new m.room.name event.

lib/src/utils/event_localizations.dart

@@ -299,5 +299,6 @@ abstract class EventLocalizations {
                   ?.tryGet<String>('key') ??
               body,
         ),
+    EventTypes.refreshingLastEvent: (_, i18n, ___) => i18n.refreshingLastEvent,
   };
 }

lib/src/utils/matrix_default_localizations.dart

@@ -318,4 +318,7 @@ class MatrixDefaultLocalizations extends MatrixLocalizations {
         : '${duration.inMinutes.toString().padLeft(2, '0')}:${(duration.inSeconds % 60).toString().padLeft(2, '0')} ';
     return '$senderName: ${durationString}Voice message';
   }
+
+  @override
+  String get refreshingLastEvent => 'Refreshing last event...';
 }

lib/src/utils/matrix_localizations.dart

@@ -62,6 +62,8 @@ abstract class MatrixLocalizations {
 
   String get cancelledSend;
 
+  String get refreshingLastEvent;
+
   String youInvitedBy(String senderName);
 
   String invitedBy(String senderName);

test/client_test.dart

@@ -201,26 +201,26 @@ void main() {
         matrix.getDirectChatFromUserId('@bob:example.com'),
         '!726s6s6q:example.com',
       );
-      expect(matrix.rooms[2].directChatMatrixID, '@bob:example.com');
+      expect(matrix.rooms[1].directChatMatrixID, '@bob:example.com');
       expect(matrix.directChats, matrix.accountData['m.direct']?.content);
       // ignore: deprecated_member_use_from_same_package
       expect(matrix.presences.length, 1);
-      expect(matrix.rooms[2].ephemerals.length, 2);
-      expect(matrix.rooms[2].typingUsers.length, 1);
-      expect(matrix.rooms[2].typingUsers[0].id, '@alice:example.com');
-      expect(matrix.rooms[2].roomAccountData.length, 3);
-      expect(matrix.rooms[2].encrypted, true);
+      expect(matrix.rooms[1].ephemerals.length, 2);
+      expect(matrix.rooms[1].typingUsers.length, 1);
+      expect(matrix.rooms[1].typingUsers[0].id, '@alice:example.com');
+      expect(matrix.rooms[1].roomAccountData.length, 3);
+      expect(matrix.rooms[1].encrypted, true);
       expect(
-        matrix.rooms[2].encryptionAlgorithm,
+        matrix.rooms[1].encryptionAlgorithm,
         Client.supportedGroupEncryptionAlgorithms.first,
       );
       expect(
         matrix
-            .rooms[2].receiptState.global.otherUsers['@alice:example.com']?.ts,
+            .rooms[1].receiptState.global.otherUsers['@alice:example.com']?.ts,
         1436451550453,
       );
       expect(
-        matrix.rooms[2].receiptState.global.otherUsers['@alice:example.com']
+        matrix.rooms[1].receiptState.global.otherUsers['@alice:example.com']
             ?.eventId,
         '\$7365636s6r6432:example.com',
       );
@@ -231,7 +231,7 @@ void main() {
       expect(inviteRoom.states[EventTypes.RoomMember]?.length, 1);
       expect(matrix.rooms.length, 3);
       expect(
-        matrix.rooms[2].canonicalAlias,
+        matrix.rooms[1].canonicalAlias,
         "#famedlyContactDiscovery:${matrix.userID!.split(":")[1]}",
       );
       expect(