import 'dart:async';

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

class LogInView extends StatefulWidget {
  const LogInView({super.key});

  @override
  State<LogInView> createState() => _LogInViewState();
}

class _LogInViewState extends State<LogInView> {
  final List<String> scopes = <String>[];

  GoogleSignInAccount? _currentUser;

  Future<void> _handleAuthenticationEvent(GoogleSignInAuthenticationEvent event) async {
    // #docregion CheckAuthorization
    final GoogleSignInAccount? user = // ...
        // #enddocregion CheckAuthorization
        switch (event) {
          GoogleSignInAuthenticationEventSignIn() => event.user,
          GoogleSignInAuthenticationEventSignOut() => null,
        };

    setState(() {
      _currentUser = user;
    });

    // If the user has already granted access to the required scopes, call the
    // REST API.
  }

  Future<void> _handleAuthenticationError(Object e) async {
    print(e);
  }

  @override
  void initState() {
    super.initState();
    // #docregion Setup

    final GoogleSignIn signIn = GoogleSignIn.instance;
    unawaited(
      signIn
          .initialize(
            clientId: 'xxxxxxxxxxxxxxxxxxxxxxxxx',
            serverClientId: 'xxxxxxxxxxxxxx',
          )
          .then((_) {
            signIn.authenticationEvents.listen(_handleAuthenticationEvent).onError(_handleAuthenticationError);
          }),
    );
    // #enddocregion Setup
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: InkWell(
          child: Text('Login'),
          onTap: () async {
            try {
              await GoogleSignIn.instance.authenticate();
            } catch (e) {
              // #enddocregion ExplicitSignIn
              print(e);

              // #docregion ExplicitSignIn
            }
          },
        ),
      ),
    );
  }
}