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

class EnumParam<T> extends StatelessWidget {
  final String title;
  final String? description;
  final T initial;
  final List<T> values;
  final Function(T v) onChanged;
  final Function(T v)? getName;

  EnumParam(
    this.title,
    this.values,
    this.initial,
    this.onChanged, {
    this.description,
    this.getName,
  });

  String _defaultName(T v) => ((v is Enum) ? v.name : v.toString());

  @override
  Widget build(BuildContext context) {
    T value = initial;
    return Padding(
      padding: const EdgeInsets.all(8.0),
      child: Row(
        children: [
          Column(
            mainAxisAlignment: MainAxisAlignment.center,
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text(title),
              if (description != null)
                Text(
                  description!,
                  style: TextStyle(fontSize: 12),
                )
            ],
          ),
          SizedBox(
            width: 2,
          ),
          Expanded(
            child: StatefulBuilder(builder: (context, setState) {
              return DropdownButton<T>(
                value: value,
                items: values
                    .map(
                      (v) => DropdownMenuItem(
                        child: Text(getName?.call(v) ?? _defaultName(v)),
                        value: v,
                      ),
                    )
                    .toList(),
                onChanged: (v) => setState(() {
                  value = v!;
                  onChanged(v);
                }),
              );
            }),
          )
        ],
      ),
    );
  }
}