import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../../../core/auth/auth_notifier.dart';

class DisplayNameScreen extends ConsumerStatefulWidget {
  const DisplayNameScreen({super.key});

  @override
  ConsumerState<DisplayNameScreen> createState() => _DisplayNameScreenState();
}

class _DisplayNameScreenState extends ConsumerState<DisplayNameScreen> {
  final _controller = TextEditingController();

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  void _submit() {
    final name = _controller.text.trim();
    if (name.isEmpty) return;
    ref.read(authProvider.notifier).loginAnonymous(name);
  }

  @override
  Widget build(BuildContext context) {
    final authState = ref.watch(authProvider);
    final isLoading = authState is AsyncLoading;

    ref.listen(authProvider, (prev, next) {
      if (next is AsyncError) {
        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(next.error.toString())));
      }
    });

    return Scaffold(
      appBar: AppBar(title: const Text('Siapa namamu?')),
      body: Padding(
        padding: const EdgeInsets.all(24),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            const Text('Pilih nama yang ingin kamu gunakan. Nama ini tidak akan terlihat oleh siapapun selain mitra kamu.'),
            const SizedBox(height: 24),
            TextField(
              controller: _controller,
              decoration: const InputDecoration(
                labelText: 'Nama panggilan',
                border: OutlineInputBorder(),
              ),
              textInputAction: TextInputAction.done,
              onSubmitted: (_) => _submit(),
            ),
            const SizedBox(height: 24),
            ElevatedButton(
              onPressed: isLoading ? null : _submit,
              child: isLoading
                  ? const CircularProgressIndicator()
                  : const Text('Lanjut'),
            ),
          ],
        ),
      ),
    );
  }
}