number_conversion.dart

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class NumberConversionService {
  static double kgToMetricTon(num? kg) {
    if (kg == null) return 0.0;
    return kg / 1000;
  }
 
  static String formatWithCommas(num? value) {
    if (value == null) return "0.00";
    return value.toStringAsFixed(2).replaceAllMapped(
        RegExp(r'(\d)(?=(\d{3})+(?!\d))'), (Match m) => '${m[1]},');
  }
 
  static String convertAndFormatWeight(num? kg) {
    if (kg == null || kg < 1000) {
      return "${formatWithCommas(kg ?? 0)} kg";
    }
    double mt = kgToMetricTon(kg);
    return "${formatWithCommas(mt)} Mt";
  }
}