extractnational static method

Future<IDCardInfo> extractnational(List<String> lines)

Implementation

static Future<IDCardInfo> extractnational(List<String> lines) async {
  String? idNumber;
  String? firstName;
  String? lastName;
  String? middleName;
  String? dob;
  String? nin;
  String? extractedDetails;

  // --- Primary Extraction from Machine-Readable Zone (MRZ) ---
  String? mrzLine1, mrzLine2;
  for (final line in lines) {
    if(extractedDetails == null){
      extractedDetails = line;
    }else{
      extractedDetails += " ***videx*** $line";
    }
    final normalizedLine = line.replaceAll(' ', '');
    if (normalizedLine.startsWith('P<NGA')) {
      mrzLine1 = line;
    } else if (RegExp(r'^[A-Z0-9<]{9,}[0-9]NGA').hasMatch(normalizedLine)) {
      mrzLine2 = normalizedLine;
    }
  }

  // 1. Full Name from MRZ (Highest Confidence)
  if (mrzLine1 != null) {
    try {
      String mrzNamePart = mrzLine1.substring(5); // Skip 'P<NGA'
      List<String> nameParts = mrzNamePart.split('<<');
      if (nameParts.length > 1) {
        lastName = nameParts[0].replaceAll('<', ' ').trim();
        String givenNames = nameParts[1].replaceAll('<', ' ').trim();
        List<String> givenNameParts = givenNames.split(RegExp(r'\s+'));
        if (givenNameParts.isNotEmpty) {
          firstName = givenNameParts[0];
        }
        if (givenNameParts.length > 1) {
          middleName = givenNameParts.sublist(1).join(' ');
        }
      }
    } catch (e) {
      dev.log("Error parsing MRZ name line: $e");
    }
  }

  // 2. ID Number from MRZ (Highest Confidence)
  if (mrzLine2 != null) {
    try {
      idNumber = mrzLine2.substring(0, 9).replaceAll('<', '');
    } catch (e) {
      dev.log("Error parsing MRZ ID line: $e");
    }
  }

  // --- Secondary/Fallback Extraction ---

  // Fallback for ID Number
  if (idNumber == null || idNumber.isEmpty) {
    for (final line in lines) {
      final match = RegExp(r'^[A-Z][0-9]{8}$').firstMatch(line.trim());
      if (match != null) {
        idNumber = match.group(0);
        break;
      }
    }
  }

  // Fallback for Name
  if (firstName == null || lastName == null) {
      for (final line in lines) {
          final upper = line.toUpperCase().trim();
          final parts = upper.split(RegExp(r'\s+'));
          if (parts.length >= 2 && parts.length <= 4 && parts.every((p) => RegExp(r'^[A-Z]+$').hasMatch(p)) && !upper.contains('FEDERAL') && !upper.contains('REPUBLIC')) {
              lastName = parts[0];
              firstName = parts[1];
              if (parts.length > 2) {
                  middleName = parts.sublist(2).join(' ');
              }
              break;
          }
      }
  }

  // Label-based extraction for DOB and NIN (can be run regardless)
   for (int i = 0; i < lines.length; i++) {
    final upper = lines[i].toUpperCase().trim();
    final dobRegex = RegExp(r'(\d{1,2})\s+([A-Z]{3})(?:\s*[/]?\s*[A-Z]{3})?\s+(\d{2,4})');
    final match = dobRegex.firstMatch(upper.toUpperCase());
    if (match != null) {
      String day = match.group(1)!.padLeft(2, '0');
      String monthStr = match.group(2)!;
      String year = match.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) {
        if (year.length == 2) {
          int yr = int.parse(year);
          year = (yr > (DateTime.now().year % 100)) ? '19$year' : '20$year';
        }
        dob = '$day-$month-$year';
      }
    }

    // NIN Extraction
    // if (upper.contains('NIN')) {
       final match1 = RegExp(r'(\d{11})').firstMatch(upper.replaceAll(' ', ''));
       if (match1 != null) {
         nin = match1.group(1)!;
       // } else if (i + 1 < lines.length) {
       //   final nextLineMatch = RegExp(r'(\d{11})').firstMatch(lines[i + 1].replaceAll(' ', ''));
       //   if (nextLineMatch != null) {
       //     nin = nextLineMatch.group(1)!;
       //   }
       }
       dev.log("nin: $nin");
    // }
  }

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