import 'package:googleapis_auth/auth_io.dart'; // access token almak için

import 'package:http/http.dart' as http;

Future<void> bildirimGonder(String title, String body, String toToken) async {

      // 1. Service account dosyasını oku

      String jsonString = await rootBundle.loadString('assets/ayar/firebaseprojeid.json');

      Map<String, dynamic> serviceAccount = json.decode(jsonString);

      // 2. JSON içinden bilgiler

      String clientEmail = serviceAccount['client_email'];

      String privateKey = serviceAccount['private_key'];

      final accountCredentials = ServiceAccountCredentials(

        clientEmail,

        ClientId("", ""), // boş bırak, sadece ServiceAccount kullanıyoruz

        privateKey,

      );

      final scopes = ['https://www.googleapis.com/auth/firebase.messaging'];

      final authClient = await clientViaServiceAccount(accountCredentials, scopes);

      final accessToken = authClient.credentials.accessToken.data;

      print('Access Token: $accessToken');

      // 3. Bildirimi gönder

      await http.post(

        Uri.parse('https://fcm.googleapis.com/v1/projects/${serviceAccount["project_id"]}/messages:send'),

        headers: {

          'Authorization': 'Bearer $accessToken',

          'Content-Type': 'application/json; charset=UTF-8',

        },

        body: jsonEncode({

          "message": {

            "token": toToken,

            "notification": {

              "title": title,

              "body": body,

            }

          }

        }),

      );

    }