✨ Dynamic chat online counter basis

lib/pods/chat/chat_summary.dart

@@ -0,0 +1,98 @@
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+import 'package:island/models/chat.dart';
+import 'package:island/pods/network.dart';
+import 'package:island/pods/websocket.dart';
+
+part 'chat_summary.g.dart';
+
+@riverpod
+class ChatSummary extends _$ChatSummary {
+  @override
+  Future<Map<String, SnChatSummary>> build() async {
+    final client = ref.watch(apiClientProvider);
+    final resp = await client.get('/sphere/chat/summary');
+
+    final Map<String, dynamic> data = resp.data;
+    final summaries = data.map(
+      (key, value) => MapEntry(key, SnChatSummary.fromJson(value)),
+    );
+
+    final ws = ref.watch(websocketProvider);
+    final subscription = ws.dataStream.listen((WebSocketPacket pkt) {
+      if (!pkt.type.startsWith('messages')) return;
+      if (pkt.type == 'messages.new') {
+        final message = SnChatMessage.fromJson(pkt.data!);
+        updateLastMessage(message.chatRoomId, message);
+      } else if (pkt.type == 'messages.update') {
+        final message = SnChatMessage.fromJson(pkt.data!);
+        updateMessageContent(message.chatRoomId, message);
+      }
+    });
+
+    ref.onDispose(() {
+      subscription.cancel();
+    });
+
+    return summaries;
+  }
+
+  Future<void> clearUnreadCount(String chatId) async {
+    state.whenData((summaries) {
+      final summary = summaries[chatId];
+      if (summary != null) {
+        state = AsyncData({
+          ...summaries,
+          chatId: SnChatSummary(
+            unreadCount: 0,
+            lastMessage: summary.lastMessage,
+          ),
+        });
+      }
+    });
+  }
+
+  void updateLastMessage(String chatId, SnChatMessage message) {
+    state.whenData((summaries) {
+      final summary = summaries[chatId];
+      if (summary != null) {
+        state = AsyncData({
+          ...summaries,
+          chatId: SnChatSummary(
+            unreadCount: summary.unreadCount + 1,
+            lastMessage: message,
+          ),
+        });
+      }
+    });
+  }
+
+  void incrementUnreadCount(String chatId) {
+    state.whenData((summaries) {
+      final summary = summaries[chatId];
+      if (summary != null) {
+        state = AsyncData({
+          ...summaries,
+          chatId: SnChatSummary(
+            unreadCount: summary.unreadCount + 1,
+            lastMessage: summary.lastMessage,
+          ),
+        });
+      }
+    });
+  }
+
+  void updateMessageContent(String chatId, SnChatMessage message) {
+    state.whenData((summaries) {
+      final summary = summaries[chatId];
+      if (summary != null && summary.lastMessage?.id == message.id) {
+        state = AsyncData({
+          ...summaries,
+          chatId: SnChatSummary(
+            unreadCount: summary.unreadCount,
+            lastMessage: message,
+          ),
+        });
+      }
+    });
+  }
+}