add support for altering room ordering

Fixes #115

lib/controllers/settings_sections.dart

@@ -18,6 +18,7 @@ import "package:nexus/controllers/unified_push_allowed.dart";
 import "package:nexus/controllers/unified_push_distributors.dart";
 import "package:nexus/helpers/extensions/distributor_name.dart";
 import "package:nexus/models/account_data.dart";
+import "package:nexus/models/room_order.dart";
 import "package:nexus/models/settings_category.dart";
 import "package:nexus/main.dart";
 import "package:nexus/widgets/settings/dialog_list_tile.dart";
@@ -94,6 +95,26 @@ class SettingsSectionsController
                     .onError(showError),
               ),
             ),
+            .new(
+              title: "Room Ordering",
+              description: "Sort rooms by recent activity, optionally showing mentioned and unread rooms first.",
+              icon: Icons.sort,
+              builder: (title, description, icon) => DialogListTile<RoomOrder>(
+                icon: Icon(icon),
+                title: title,
+                subtitle: Text(description),
+                initialValue: settings.roomOrder,
+                options: RoomOrder.values,
+                getName: (option) => switch (option) {
+                  .unreadFirst => "Mentioned, then unread",
+                  .recentActivity => "Recent activity only",
+                },
+                onChanged: (value) => ref
+                    .read(SettingsController.provider.notifier)
+                    .set(settings.copyWith(roomOrder: value))
+                    .onError(showError),
+              ),
+            ),
             if (!Platform.isAndroid && !Platform.isIOS)
               .new(
                 title: "Show Minimize Button",

lib/controllers/spaces.dart

@@ -8,6 +8,7 @@ import "package:nexus/controllers/settings.dart";
 import "package:nexus/controllers/top_level_spaces.dart";
 import "package:nexus/controllers/space_edges.dart";
 import "package:nexus/models/room.dart";
+import "package:nexus/models/room_metadata.dart";
 import "package:nexus/models/space.dart";
 import "package:nexus/models/subspace.dart";
 
@@ -135,22 +136,32 @@ class SpacesController extends AsyncNotifier<IList<Space>> {
       ...spaces,
     ];
 
+    final roomOrder = await ref.watch(
+      SettingsController.provider.selectAsync((data) => data.roomOrder),
+    );
+
+    // Mentioned -> Unread -> Other
+    int unreadPriority(Room room) => switch (room.metadata) {
+      RoomMetadata(unreadHighlights: > 0) => 0,
+      RoomMetadata(unreadNotifications: > 0) ||
+      RoomMetadata(unreadMessages: > 0) => 1,
+      _ => 2,
+    };
+
     return allSpaces
         .map(
           (space) => space.copyWith(
-            children: .new(
-              space.children
-                  .sortedBy(
-                    (element) =>
-                        element
-                            .metadata
-                            ?.sortingTimestamp
-                            .millisecondsSinceEpoch ??
-                        0,
-                  )
-                  .sortedBy((room) => room.metadata?.unreadMessages ?? 0)
-                  .reversed,
-            ),
+            children: space.children.sort((a, b) {
+              if (roomOrder == .unreadFirst) {
+                final byUnread = unreadPriority(a).compareTo(unreadPriority(b));
+                if (byUnread != 0) return byUnread;
+              }
+
+              // Most recent activity first
+              return (b.metadata?.sortingTimestamp ?? DateTime(0)).compareTo(
+                a.metadata?.sortingTimestamp ?? DateTime(0),
+              );
+            }),
           ),
         )
         .toIList();

lib/models/room_order.dart

@@ -0,0 +1 @@
+enum RoomOrder { unreadFirst, recentActivity }

lib/models/settings.dart

@@ -1,5 +1,6 @@
 import "package:material_ui/material_ui.dart";
 import "package:freezed_annotation/freezed_annotation.dart";
+import "package:nexus/models/room_order.dart";
 
 part "settings.freezed.dart";
 part "settings.g.dart";
@@ -12,6 +13,7 @@ class const Settings({
   final bool linuxMobileMode = false,
   final bool showAllInHome = false,
   final bool showMinimizeButton = false,
+  final RoomOrder roomOrder = .unreadFirst,
 }) with _$Settings {
   Map<String, Object?> toJson() => _$SettingsToJson(this);