diameter/lib/utils/utils.dart

import 'dart:math';

class Utils {
  static double roundToDecimalPlaces(double value, int places) {
    double mod = pow(10.0, places).toDouble();
    return ((value * mod).round().toDouble() / mod);
  }

  static double convertMgPerDlToMmolPerL(int mgPerDl) {
    return Utils.roundToDecimalPlaces(mgPerDl * 0.0555, 2);
  }

  static int convertMmolPerLToMgPerDl(double mmolPerL) {
    return (mmolPerL * 18.018).round();
  }

  static double calculateCarbsPerPortion(
      double carbsRatio, double portionSize) {
    return Utils.roundToDecimalPlaces(carbsRatio * portionSize / 100, 2);
  }

  static double calculateCarbsRatio(
      double carbsPerPortion, double portionSize) {
    return Utils.roundToDecimalPlaces(carbsPerPortion * 100 / portionSize, 2);
  }

  static double calculatePortionSize(
      double carbsRatio, double carbsPerPortion) {
    return Utils.roundToDecimalPlaces(carbsPerPortion * 100 / carbsRatio, 2);
  }
}