pad_scanner/lib/services/code_parser.dart

// lib/services/code_parser.dart
class CodeParser {
  static final _zongpaiRegex = RegExp(r'^\d{2}(B|C|T)\d+$|^\d{2}(BW|CW)\d{4}$');
  static final _locationRegex = RegExp(r'^[A-Z0-9]+-[A-Z0-9]+-[A-Z0-9]+$');
  static final _transitRegex = RegExp(r'^TRANS-');

  static ParseResult parse(String code) {
    final trimmed = code.trim();
    if (trimmed.isEmpty) {
      return ParseResult(type: CodeType.invalid, value: code);
    }
    final normalized = trimmed.toUpperCase();
    if (_transitRegex.hasMatch(normalized)) {
      return ParseResult(type: CodeType.locationTransit, value: normalized);
    }
    if (_zongpaiRegex.hasMatch(normalized)) {
      return ParseResult(type: CodeType.zongpaiNo, value: normalized);
    }
    if (_locationRegex.hasMatch(normalized)) {
      if (normalized.startsWith('B')) {
        return ParseResult(
          type: CodeType.locationTempStorage,
          value: normalized,
        );
      }
      return ParseResult(type: CodeType.locationNormal, value: normalized);
    }
    return ParseResult(type: CodeType.invalid, value: code);
  }

  static bool isLocation(CodeType type) =>
      type == CodeType.locationNormal ||
      type == CodeType.locationTransit ||
      type == CodeType.locationTempStorage;
}

enum CodeType {
  zongpaiNo,
  locationNormal,
  locationTransit,
  locationTempStorage,
  invalid,
}

class ParseResult {
  final CodeType type;
  final String value;
  ParseResult({required this.type, required this.value});
}