/// Name prompt that owns its text controller for the dialog lifetime.
library;

import 'package:flutter/material.dart';

Future<String?> showNameDialog(
  BuildContext context, {
  required String title,
  String? initial,
  String label = 'Name',
  String confirmLabel = 'Save',
}) {
  return showDialog<String>(
    context: context,
    builder: (context) => _NameDialog(
      title: title,
      initial: initial ?? '',
      label: label,
      confirmLabel: confirmLabel,
    ),
  );
}

class _NameDialog extends StatefulWidget {
  const _NameDialog({
    required this.title,
    required this.initial,
    required this.label,
    required this.confirmLabel,
  });

  final String title;
  final String initial;
  final String label;
  final String confirmLabel;

  @override
  State<_NameDialog> createState() => _NameDialogState();
}

class _NameDialogState extends State<_NameDialog> {
  late final TextEditingController _controller;
  String? _error;

  @override
  void initState() {
    super.initState();
    _controller = TextEditingController(text: widget.initial);
  }

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

  void _save() {
    final name = _controller.text.trim();
    if (name.isEmpty) {
      setState(() => _error = 'Enter a name.');
      return;
    }
    Navigator.of(context).pop(name);
  }

  @override
  Widget build(BuildContext context) {
    return AlertDialog(
      title: Text(widget.title),
      content: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          TextField(
            controller: _controller,
            autofocus: true,
            textCapitalization: TextCapitalization.sentences,
            decoration: InputDecoration(labelText: widget.label),
            onSubmitted: (_) => _save(),
          ),
          if (_error != null) ...[
            const SizedBox(height: 8),
            Align(
              alignment: Alignment.centerLeft,
              child: Text(
                _error!,
                style: TextStyle(color: Theme.of(context).colorScheme.error),
              ),
            ),
          ],
        ],
      ),
      actions: [
        TextButton(
          onPressed: () => Navigator.of(context).pop(),
          child: const Text('Cancel'),
        ),
        TextButton(onPressed: _save, child: Text(widget.confirmLabel)),
      ],
    );
  }
}