chat support

lib/services/chat_service.dart

@@ -0,0 +1,41 @@
+import 'package:dio/dio.dart';
+import '../config/api_config.dart';
+
+class ChatService {
+  final Dio dio;
+
+  ChatService(this.dio);
+
+  /// Start chat / get ticket
+  Future<Map<String, dynamic>> startChat() async {
+    final res = await dio.get('/user/chat/start');
+    return Map<String, dynamic>.from(res.data);
+  }
+
+  /// Get all messages
+  Future<List<dynamic>> getMessages(int ticketId) async {
+    final res = await dio.get('/user/chat/messages/$ticketId');
+    return res.data['messages'];
+  }
+
+  /// Send message (text or file)
+  Future<void> sendMessage(
+      int ticketId, {
+        String? message,
+        String? filePath,
+      }) async {
+    final form = FormData();
+
+    if (message != null) form.fields.add(MapEntry('message', message));
+    if (filePath != null) {
+      form.files.add(
+        MapEntry(
+          'file',
+          await MultipartFile.fromFile(filePath),
+        ),
+      );
+    }
+
+    await dio.post('/user/chat/send/$ticketId', data: form);
+  }
+}