OSM message notifications in theory

lib/state/messages_state.dart

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+import 'package:flutter/material.dart';
+import '../services/osm_messages_service.dart';
+import 'settings_state.dart';
+
+/// State management for OSM message notifications
+class MessagesState extends ChangeNotifier {
+  final OSMMessagesService _messagesService = OSMMessagesService();
+  
+  int? _unreadCount;
+  bool _isChecking = false;
+  
+  // Getters
+  int? get unreadCount => _unreadCount;
+  bool get hasUnreadMessages => (_unreadCount ?? 0) > 0;
+  bool get isChecking => _isChecking;
+  
+  /// Check for unread messages
+  Future<void> checkMessages({
+    required String? accessToken,
+    required UploadMode uploadMode,
+    bool forceRefresh = false,
+  }) async {
+    if (_isChecking) return; // Prevent concurrent checks
+    
+    _isChecking = true;
+    notifyListeners();
+    
+    try {
+      final count = await _messagesService.getUnreadMessageCount(
+        accessToken: accessToken,
+        uploadMode: uploadMode,
+        forceRefresh: forceRefresh,
+      );
+      
+      if (_unreadCount != count) {
+        _unreadCount = count;
+        notifyListeners();
+      }
+    } catch (e) {
+      // Silently handle errors - messages are not critical
+      debugPrint('MessagesState: Error checking messages: $e');
+    } finally {
+      _isChecking = false;
+      notifyListeners();
+    }
+  }
+  
+  /// Get the URL to view messages
+  String getMessagesUrl(UploadMode uploadMode) {
+    return _messagesService.getMessagesUrl(uploadMode);
+  }
+  
+  /// Clear message state (when user logs out or changes mode)
+  void clearMessages() {
+    _unreadCount = null;
+    _messagesService.clearCache();
+    notifyListeners();
+  }
+}