// lib/shared/csv.dart
class CsvBuilder {
  final StringBuffer _buf = StringBuffer();
  final String delimiter;
  final String eol;

  CsvBuilder({this.delimiter = ';', this.eol = '\n'});

  static String _escape(String? v, String delimiter) {
    final s = v ?? '';
    final mustQuote =
        s.contains(delimiter) || s.contains('\n') || s.contains('"');
    var out = s.replaceAll('"', '""');
    return mustQuote ? '"$out"' : out;
  }

  void addRow(Iterable<dynamic> cols) {
    _buf.writeln(
        cols.map((c) => _escape(c?.toString(), delimiter)).join(delimiter));
  }

  @override
  String toString() => _buf.toString();
}