import 'package:flutter/material.dart';

class Exercises extends StatefulWidget {
  final ValueChanged<String> onChanged;
  final String? exercises;
  final List<String?> names;

  const Exercises(
      {required this.onChanged,
      required this.exercises,
      super.key,
      required this.names});

  @override
  createState() => _ExercisesState();
}

class _ExercisesState extends State<Exercises> {
  late List<bool> _selections;

  @override
  initState() {
    super.initState();
    final exercises = widget.exercises?.split(',');
    _selections =
        widget.names.map((name) => exercises?.contains(name) ?? false).toList();
  }

  String _getExercises() {
    List<String> exercises = [];
    for (int i = 0; i < _selections.length; i++)
      if (_selections[i]) exercises.add(widget.names[i] ?? '');
    return exercises.join(",");
  }

  void _updateSelections(int index) {
    setState(() {
      _selections[index] = !_selections[index];
      widget.onChanged(_getExercises());
    });
  }

  @override
  Widget build(BuildContext context) {
    return Column(children: [
      Text('Exercises', style: Theme.of(context).textTheme.headlineSmall),
      Expanded(
        child: ListView(
          children: List.generate(widget.names.length, (index) {
            return SwitchListTile(
              title: Text(widget.names[index] ?? ''),
              value: _selections[index],
              onChanged: (value) => _updateSelections(index),
            );
          }),
        ),
      ),
    ]);
  }
}