add invite support

Closes #82

lib/controllers/client.dart

@@ -191,10 +191,8 @@ class ClientController extends AsyncNotifier<int> {
   Future<RoomSummary> getRoomSummary(JoinRoomRequest request) async =>
       .fromJson(await _sendCommand("get_room_summary", request.toJson()));
 
-  Future<void> leaveRoom(Room room) async {
-    if (room.metadata == null) return;
-    await _sendCommand("leave_room", {"room_id": room.metadata!.id});
-  }
+  Future<void> leaveRoom(String roomId) =>
+      _sendCommand("leave_room", {"room_id": roomId});
 
   Future<IList<Event>> getRoomState(GetRoomStateRequest request) async {
     Future<List?> getState(GetRoomStateRequest request) async =>

lib/controllers/gomuks_listener.dart

@@ -1,11 +1,13 @@
 import "dart:async";
 import "dart:ffi";
 
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
 import "package:flutter/foundation.dart";
 import "package:nexus/controllers/account_data.dart";
 import "package:nexus/controllers/client.dart";
 import "package:nexus/controllers/client_state.dart";
 import "package:nexus/controllers/init_complete.dart";
+import "package:nexus/controllers/invites.dart";
 import "package:nexus/controllers/rooms.dart";
 import "package:nexus/controllers/space_edges.dart";
 import "package:nexus/controllers/sync_status.dart";
@@ -61,10 +63,12 @@ class GomuksListenerController extends AsyncNotifier<void> {
                 final syncData = SyncData.fromJson(decodedMuksEvent);
                 final roomProvider = RoomsController.provider;
                 final accountDataProvider = AccountDataController.provider;
+                final invitesProvider = InvitesController.provider;
 
                 if (syncData.clearState) {
                   ref.invalidate(roomProvider);
                   ref.invalidate(accountDataProvider);
+                  ref.invalidate(invitesProvider);
                 }
 
                 ref
@@ -73,6 +77,13 @@ class GomuksListenerController extends AsyncNotifier<void> {
                 ref
                     .read(accountDataProvider.notifier)
                     .update(syncData.accountData);
+                ref
+                    .read(invitesProvider.notifier)
+                    .update(
+                      syncData.invitedRooms,
+                      joinedRooms: syncData.rooms.keys.toISet(),
+                      leftRooms: syncData.leftRooms,
+                    );
 
                 if (syncData.topLevelSpaces case final topLevelSpaces?) {
                   ref

lib/controllers/invites.dart

@@ -0,0 +1,117 @@
+import "package:collection/collection.dart";
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
+import "package:flutter_riverpod/flutter_riverpod.dart";
+import "package:nexus/controllers/client.dart";
+import "package:nexus/controllers/client_state.dart";
+import "package:nexus/helpers/extensions/get_localpart.dart";
+import "package:nexus/models/content/avatar.dart";
+import "package:nexus/models/content/canonical_alias.dart";
+import "package:nexus/models/content/content.dart";
+import "package:nexus/models/content/create.dart";
+import "package:nexus/models/content/encryption.dart";
+import "package:nexus/models/content/history_visibility.dart";
+import "package:nexus/models/content/join_rules.dart";
+import "package:nexus/models/content/membership.dart";
+import "package:nexus/models/content/name.dart";
+import "package:nexus/models/content/topic.dart";
+import "package:nexus/models/invited_room.dart";
+import "package:nexus/models/room_summary.dart";
+
+/// Pending invites, newest first.
+class InvitesController extends Notifier<IList<RoomSummary>> {
+  @override
+  IList<RoomSummary> build() => .new();
+
+  /// Adds new invites, and removes invites for rooms that have since been
+  /// joined or left.
+  void update(
+    IList<InvitedRoom> invitedRooms, {
+    ISet<String> joinedRooms = const .empty(),
+    ISet<String> leftRooms = const .empty(),
+  }) {
+    final userId = ref.read(ClientStateController.provider)?.userId;
+
+    RoomSummary toSummary(InvitedRoom invite) {
+      final summary = invite.inviteState.fold(
+        RoomSummary(roomId: invite.roomId, membership: .invite),
+        (summary, event) => switch (event.content) {
+          NameContent(:final name) when name.isNotEmpty => summary.copyWith(
+            name: name,
+          ),
+          AvatarContent(:final url) => summary.copyWith(avatarUrl: url),
+          TopicContent(:final topic) when topic.isNotEmpty => summary.copyWith(
+            topic: topic,
+          ),
+          CanonicalAliasContent(:final alias) => summary.copyWith(
+            canonicalAlias: alias,
+          ),
+          JoinRulesContent(:final joinRule) => summary.copyWith(
+            joinRule: joinRule,
+          ),
+          CreateContent(:final type, :final roomVersion) => summary.copyWith(
+            roomType: type,
+            roomVersion: roomVersion,
+          ),
+          EncryptionContent(:final algorithm) => summary.copyWith(
+            encryption: algorithm,
+          ),
+          HistoryVisibilityContent(:final historyVisibility) =>
+            summary.copyWith(
+              worldReadable: historyVisibility == .worldReadable,
+            ),
+          MembershipContent(:final isDirect) when event.stateKey == userId =>
+            summary.copyWith(invitedBy: event.sender, isDirect: isDirect),
+          _ => summary,
+        },
+      );
+
+      // The inviter is only known once the user's own invite has been found
+      final inviterProfile = switch (invite.inviteState
+          .firstWhereOrNull(
+            (event) =>
+                event.type == EventType.membership.type &&
+                event.stateKey == summary.invitedBy,
+          )
+          ?.content) {
+        MembershipContent content => content,
+        _ => null,
+      };
+
+      return summary.copyWith(
+        inviterProfile: inviterProfile,
+        // Direct messages usually have no name, so use the inviter's
+        name:
+            summary.name ??
+            (summary.isDirect
+                ? inviterProfile?.displayName ?? summary.invitedBy?.localpart
+                : null),
+      );
+    }
+
+    final newInvites = invitedRooms.map(toSummary).toIList();
+    final newRoomIds = newInvites.map((invite) => invite.roomId).toISet();
+    final removed = joinedRooms.addAll(leftRooms);
+
+    state = newInvites
+        .addAll(state.where((invite) => !newRoomIds.contains(invite.roomId)))
+        .removeWhere((invite) => removed.contains(invite.roomId));
+  }
+
+  void remove(String roomId) =>
+      state = state.removeWhere((invite) => invite.roomId == roomId);
+
+  Future<void> decline(String roomId) async {
+    await ref.read(ClientController.provider.notifier).leaveRoom(roomId);
+    remove(roomId);
+  }
+
+  /// Declines every invite, removing each as it succeeds. If any fail, the
+  /// first error is thrown once all have finished.
+  Future<void> declineAll() =>
+      Future.wait(state.map((invite) => decline(invite.roomId)));
+
+  static final provider =
+      NotifierProvider<InvitesController, IList<RoomSummary>>(
+        InvitesController.new,
+      );
+}

lib/controllers/notification.dart

@@ -4,6 +4,7 @@ import "dart:io";
 import "package:flutter/services.dart";
 import "package:material_ui/material_ui.dart";
 import "package:nexus/controllers/portal.dart";
+import "package:nexus/controllers/sidebar_page.dart";
 import "package:nexus/main.dart";
 import "package:flutter_local_notifications/flutter_local_notifications.dart";
 import "package:flutter_riverpod/flutter_riverpod.dart";
@@ -35,6 +36,7 @@ class NotificationController
 
           if (int.tryParse(details.payload!) case final rowId?) {
             navigatorKey.currentState?.popUntil((route) => route.isFirst);
+            ref.read(SidebarPageController.provider.notifier).set(.notifications);
             ref
                 .read(NotificationRequestController.provider.notifier)
                 .request(rowId);
@@ -53,6 +55,7 @@ class NotificationController
 
         if (int.tryParse(call.arguments) case int rowId) {
           navigatorKey.currentState?.popUntil((route) => route.isFirst);
+          ref.read(SidebarPageController.provider.notifier).set(.notifications);
           ref
               .read(NotificationRequestController.provider.notifier)
               .request(rowId);

lib/controllers/sidebar_page.dart

@@ -0,0 +1,13 @@
+import "package:flutter_riverpod/flutter_riverpod.dart";
+import "package:nexus/models/sidebar_page.dart";
+
+class SidebarPageController extends Notifier<SidebarPage> {
+  @override
+  SidebarPage build() => .rooms;
+
+  void set(SidebarPage page) => state = page;
+
+  static final provider = NotifierProvider<SidebarPageController, SidebarPage>(
+    SidebarPageController.new,
+  );
+}