import 'asn1_object.dart';

class ASN1DistinguishedNames {
  final String _oid;
  final String _representation;

  const ASN1DistinguishedNames._internal(this._oid, this._representation);

  static final Set<ASN1DistinguishedNames> values = [
    ASN1DistinguishedNames.COMMON_NAME,
    ASN1DistinguishedNames.DN_QUALIFIER,
    ASN1DistinguishedNames.SERIAL_NUMBER,
    ASN1DistinguishedNames.GIVEN_NAME,
    ASN1DistinguishedNames.SURNAME,
    ASN1DistinguishedNames.ORGANIZATIONAL_UNIT_NAME,
    ASN1DistinguishedNames.ORGANIZATION_NAME,
    ASN1DistinguishedNames.STREET_ADDRESS,
    ASN1DistinguishedNames.LOCALITY_NAME,
    ASN1DistinguishedNames.STATE_OR_PROVINCE_NAME,
    ASN1DistinguishedNames.COUNTRY_NAME,
    ASN1DistinguishedNames.EMAIL,
  ].toSet();

  static ASN1DistinguishedNames? fromValue(String? oid) {
    if (oid != null) {
      try {
        return ASN1DistinguishedNames.values
            .firstWhere((element) => element.oid() == oid);
      } catch (e) {
        return null;
      }
    }
    return null;
  }

  String oid() => _oid;

  String representation() => _representation;

  @override
  String toString() => "($_oid, $_representation)";

  static const COMMON_NAME =
      const ASN1DistinguishedNames._internal("2.5.4.3", "CN");
  static const DN_QUALIFIER =
      const ASN1DistinguishedNames._internal("2.5.4.46", "DNQ");
  static const SERIAL_NUMBER =
      const ASN1DistinguishedNames._internal("2.5.4.5", "SERIALNUMBER");
  static const GIVEN_NAME =
      const ASN1DistinguishedNames._internal("2.5.4.42", "GIVENNAME");
  static const SURNAME =
      const ASN1DistinguishedNames._internal("2.5.4.4", "SURNAME");
  static const ORGANIZATIONAL_UNIT_NAME =
      const ASN1DistinguishedNames._internal("2.5.4.11", "OU");
  static const ORGANIZATION_NAME =
      const ASN1DistinguishedNames._internal("2.5.4.10", "O");
  static const STREET_ADDRESS =
      const ASN1DistinguishedNames._internal("2.5.4.9", "STREET");
  static const LOCALITY_NAME =
      const ASN1DistinguishedNames._internal("2.5.4.7", "L");
  static const STATE_OR_PROVINCE_NAME =
      const ASN1DistinguishedNames._internal("2.5.4.8", "ST");
  static const COUNTRY_NAME =
      const ASN1DistinguishedNames._internal("2.5.4.6", "C");
  static const EMAIL =
      const ASN1DistinguishedNames._internal("1.2.840.113549.1.9.1", "E");

  bool operator ==(value) => value == _oid;

  @override
  int get hashCode => _oid.hashCode;

  /// Format subject/issuer information in RFC1779
  static String string({required ASN1Object block}) {
    var result = "";
    var oidNames = ASN1DistinguishedNames.values;
    for (var oidName in oidNames) {
      var oidBlock = block.findOid(oidValue: oidName.oid());
      if (oidBlock == null) {
        continue;
      }
      if (result.isNotEmpty) {
        result += ", ";
      }
      result += oidName.representation();
      result += "=";

      String? value;
      try {
        value = oidBlock.parent?.sub?.last.value as String?;
      } catch (e) {}
      if (value != null) {
        result += quote(value);
      }
    }
    return result;
  }

  static String quote(String string) {
    var specialChars = [",", "+", "=", "\n", "<", ">", "#", ";", "\\"];
    for (var specialChar in specialChars) {
      if (string.contains(specialChar)) {
        return "\"" + string + "\"";
      }
    }
    return string;
  }
}