Firebase Auth login en Flutter: ejercicio resuelto con email y password

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

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

  @override
  State<LoginPage> createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {
  final emailCtrl = TextEditingController();
  final passCtrl = TextEditingController();

  Future<void> signIn() async {
    try {
      await FirebaseAuth.instance.signInWithEmailAndPassword(
        email: emailCtrl.text.trim(),
        password: passCtrl.text,
      );
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('Login correcto')));
    } on FirebaseAuthException catch (e) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Error: ${e.code}')));
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Firebase Login')),
      body: Padding(
        padding: const EdgeInsets.all(16),
        child: Column(
          children: [
            TextField(controller: emailCtrl, decoration: const InputDecoration(labelText: 'Email')),
            TextField(controller: passCtrl, decoration: const InputDecoration(labelText: 'Password'), obscureText: true),
            const SizedBox(height: 12),
            ElevatedButton(onPressed: signIn, child: const Text('Iniciar sesión')),
          ],
        ),
      ),
    );
  }
}