// Copyright 2022, the Chromium project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

// ignore_for_file: require_trailing_commas

import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter/material.dart';

/// Manages & returns the users FCM token.
///
/// Also monitors token refreshes and updates state.
class TokenMonitor extends StatefulWidget {
  // ignore: public_member_api_docs
  const TokenMonitor(this._builder, {super.key});

  final Widget Function(String? token) _builder;

  @override
  State<StatefulWidget> createState() => _TokenMonitor();
}

class _TokenMonitor extends State<TokenMonitor> {
  String? _token;
  late Stream<String> _tokenStream;

  void setToken(String? token) {
    print('FCM Token: $token');
    setState(() {
      _token = token;
    });
  }

  @override
  void initState() {
    super.initState();
    FirebaseMessaging.instance
        .getToken(
            vapidKey:
                'BNKkaUWxyP_yC_lki1kYazgca0TNhuzt2drsOrL6WrgGbqnMnr8ZMLzg_rSPDm6HKphABS0KzjPfSqCXHXEd06Y')
        .then(setToken);
    _tokenStream = FirebaseMessaging.instance.onTokenRefresh;
    _tokenStream.listen(setToken);
  }

  @override
  Widget build(BuildContext context) {
    return widget._builder(_token);
  }
}