flutter/lib/helpers/exercises/forms.dart

import 'package:flutter/material.dart';
import 'package:flutter_gen/gen_l10n/app_localizations.dart';

/// The amount of characters an exercise description needs to have
const MIN_CHARS_DESCRIPTION = 40;

/// The amount of characters an exercise name needs to have
const MIN_CHARS_NAME = 5;
const MAX_CHARS_NAME = 40;

String? validateName(String? name, BuildContext context) {
  if (name!.isEmpty) {
    return AppLocalizations.of(context).enterValue;
  }

  if (name.length < MIN_CHARS_NAME || name.length > MAX_CHARS_NAME) {
    return AppLocalizations.of(context).enterCharacters(MIN_CHARS_NAME, MAX_CHARS_NAME);
  }

  return null;
}

String? validateDescription(String? name, BuildContext context) {
  if (name!.isEmpty) {
    return AppLocalizations.of(context).enterValue;
  }

  if (name.length < MIN_CHARS_DESCRIPTION) {
    return AppLocalizations.of(context).enterMinCharacters(MIN_CHARS_DESCRIPTION);
  }

  return null;
}