feat: Implement notifications feature, enhance profile settings with new sections, and integrate Firebase configurations for multiple environments.

lib/features/notifications/data/notification_repository.dart

@@ -0,0 +1,103 @@
+import 'package:dio/dio.dart';
+import 'package:real_estate_mobile/core/network/api_client.dart';
+import 'package:real_estate_mobile/core/network/api_exceptions.dart';
+import 'package:real_estate_mobile/features/notifications/data/models/notification_model.dart';
+
+class NotificationRepository {
+  final Dio _dio = ApiClient.instance.dio;
+
+  /// Fetch notifications with optional filter and pagination.
+  /// GET /notifications?filter=all|unread&page=1&limit=20
+  Future<NotificationsResponse> getNotifications({
+    String filter = 'all',
+    int page = 1,
+    int limit = 20,
+  }) async {
+    try {
+      final response = await _dio.get('/notifications', queryParameters: {
+        'filter': filter,
+        'page': page,
+        'limit': limit,
+      });
+      final data = response.data['data'] as Map<String, dynamic>;
+      return NotificationsResponse.fromJson(data);
+    } on DioException catch (e) {
+      if (e.error is ApiException) throw e.error as ApiException;
+      throw ApiException(
+        message: e.message ?? 'Failed to fetch notifications',
+        statusCode: e.response?.statusCode,
+      );
+    }
+  }
+
+  /// Get unread notification count.
+  /// GET /notifications/unread-count
+  Future<int> getUnreadCount() async {
+    try {
+      final response = await _dio.get('/notifications/unread-count');
+      final data = response.data['data'] as Map<String, dynamic>;
+      return data['unreadCount'] as int? ?? 0;
+    } on DioException catch (e) {
+      if (e.error is ApiException) throw e.error as ApiException;
+      throw ApiException(
+        message: e.message ?? 'Failed to fetch unread count',
+        statusCode: e.response?.statusCode,
+      );
+    }
+  }
+
+  /// Mark a single notification as read.
+  /// PATCH /notifications/:id/read
+  Future<void> markAsRead(String notificationId) async {
+    try {
+      await _dio.patch('/notifications/$notificationId/read');
+    } on DioException catch (e) {
+      if (e.error is ApiException) throw e.error as ApiException;
+      throw ApiException(
+        message: e.message ?? 'Failed to mark notification as read',
+        statusCode: e.response?.statusCode,
+      );
+    }
+  }
+
+  /// Mark all notifications as read.
+  /// PATCH /notifications/read-all
+  Future<void> markAllAsRead() async {
+    try {
+      await _dio.patch('/notifications/read-all');
+    } on DioException catch (e) {
+      if (e.error is ApiException) throw e.error as ApiException;
+      throw ApiException(
+        message: e.message ?? 'Failed to mark all as read',
+        statusCode: e.response?.statusCode,
+      );
+    }
+  }
+}
+
+class NotificationsResponse {
+  final List<AppNotification> notifications;
+  final int unreadCount;
+  final int totalPages;
+  final int currentPage;
+
+  const NotificationsResponse({
+    required this.notifications,
+    required this.unreadCount,
+    required this.totalPages,
+    required this.currentPage,
+  });
+
+  factory NotificationsResponse.fromJson(Map<String, dynamic> json) {
+    final list = (json['notifications'] as List<dynamic>?)
+            ?.map((e) => AppNotification.fromJson(e as Map<String, dynamic>))
+            .toList() ??
+        [];
+    return NotificationsResponse(
+      notifications: list,
+      unreadCount: json['unreadCount'] as int? ?? 0,
+      totalPages: json['totalPages'] as int? ?? 1,
+      currentPage: json['currentPage'] as int? ?? 1,
+    );
+  }
+}