.dart

enum OtherCardType { bandec, bpa, metropolitan, unknown }

// First Group
const _cubanStart = r'^92';
const _productName = r'[0-9]{2}';
const _firstGroup = _cubanStart + _productName;

// Second Group
const _bandecSecondGroup = r'0699';
const _metropolitanSecondGroup = r'9598';
const _bpaSecondGroup = r'1299';

const bandecCard = _firstGroup + _bandecSecondGroup;
const metropolitanCard = _firstGroup + _metropolitanSecondGroup;
const bpaCard = _firstGroup + _bpaSecondGroup;

const cubanCardRest = r'[0-9]{8}';

final cubanCardRegex =
    RegExp('($bandecCard|$metropolitanCard|$bpaCard)$cubanCardRest');

final bandecRegex = RegExp(bandecCard);
final metropolitanRegex = RegExp(metropolitanCard);
final bpaRegex = RegExp(bpaCard);

final cardPatterns = <RegExp, OtherCardType>{
  bandecRegex: OtherCardType.bandec,
  metropolitanRegex: OtherCardType.metropolitan,
  bpaRegex: OtherCardType.bpa,
};

/// This function determines the Credit Card type based on the cardPatterns
/// and returns it.
OtherCardType detectCCOtherType(String cardNumber) {
  final ccPatternStr = cardNumber.replaceAll(RegExp(r'\\D|\s+\b|\b\s'), '');

  /// We set default type to unknown
  const defaultType = OtherCardType.unknown;

  return cardPatterns.entries.fold(defaultType, (previousValue, entry) {
    final pattern = entry.key;

    if (pattern.hasMatch(ccPatternStr)) {
      // Found a match
      return entry.value;
    }
    return previousValue;
  });
}