extractunknown static method

IDCardInfo extractunknown(List<String> lines)

Implementation

static IDCardInfo extractunknown(List<String> lines) {
  String? idNumber;
  String? firstName;
  String? lastName;
  String? middleName;
  String? dob;
  String? extractedDetails;

  for (final line in lines) {
    if (extractedDetails == null) {
      extractedDetails = line;
    } else {
      extractedDetails += " ***videx*** " + line;
    }
  }

  // 1. Find NIN (most reliable feature)
  for (final line in lines) {
    final cleanedLine = line.replaceAll(' ', '');
    if (RegExp(r'^\d{11}$').hasMatch(cleanedLine)) {
      idNumber = cleanedLine;
      break;
    }
  }
  if (idNumber == null) {
    for (final line in lines) {
      final match = RegExp(r'(\d{4})\s*(\d{3})\s*(\d{4})').firstMatch(line);
      if (match != null) {
        idNumber = '${match.group(1)}${match.group(2)}${match.group(3)}';
        break;
      }
    }
  }

  // 2. Find the Anchor (Date of Birth) and extract names relative to it.
  int dobLineIndex = -1;

  final dobRegexDMY = RegExp(r'(\d{1,2})[.\s-]+([A-Z]{3})[.\s-]+(\d{4})', caseSensitive: false);
  final dobRegexYMD = RegExp(r'(\d{4})-(\d{2})-(\d{2})');

  for (int i = 0; i < lines.length; i++) {
    final line = lines[i];
    final matchDMY = dobRegexDMY.firstMatch(line);
    final matchYMD = dobRegexYMD.firstMatch(line);

    if (matchDMY != null) {
      dobLineIndex = i;
      String day = matchDMY.group(1)!.padLeft(2, '0');
      String monthStr = matchDMY.group(2)!.toUpperCase();
      String year = matchDMY.group(3)!;
      final months = {
        'JAN': '01', 'FEB': '02', 'MAR': '03', 'APR': '04', 'MAY': '05', 'JUN': '06',
        'JUL': '07', 'AUG': '08', 'SEP': '09', 'OCT': '10', 'NOV': '11', 'DEC': '12',
      };
      String? month = months[monthStr];
      if (month != null) {
        dob = '$day-$month-$year';
      }
      break;
    } else if (matchYMD != null) {
      dobLineIndex = i;
      String year = matchYMD.group(1)!;
      String month = matchYMD.group(2)!;
      String day = matchYMD.group(3)!;
      dob = '$day-$month-$year';
      break;
    }
  }

  // 3. Extract Names RELATIVE to the Anchor
  if (dobLineIndex > 1) {
    final givenNamesLine = lines[dobLineIndex - 1].trim();
    final surnameLine = lines[dobLineIndex - 2].trim();

    if (!surnameLine.toUpperCase().contains('NAME') && surnameLine.split(' ').length < 3) {
      lastName = surnameLine;
    }

    if (!givenNamesLine.toUpperCase().contains('NAME')) {
      final cleanedGivenNames = givenNamesLine.replaceAll('8', 'B').replaceAll('0', 'O');
      final parts = cleanedGivenNames.split(RegExp(r'[ ,]+'));
      firstName = parts.isNotEmpty ? parts[0] : null;
      if (parts.length > 1) {
        middleName = parts.sublist(1).join(' ');
      }
    }
  }

  return IDCardInfo(
      firstName: firstName,
      lastName: lastName,
      middleName: middleName,
      dateOfBirth: dob,
      idNumber: idNumber,
      extracteddetails: extractedDetails);
}