import 'package:flutter/cupertino.dart';

class variables extends ChangeNotifier {
  double _startH = 0; //in Meter
  double _endH = 0; // in Meter
  double _startG = 0; // in m / s
  double _endG = 0; // in m / s

  double _masse = 0; // in KG
  final double _g = 9.81; // m / s^2

  double _startTempWasser = 20; // Grad Celcius
  double _endTempWasser = 100; // Grad Celcius --> hier kocht Wasser
  double get wasserTempDif => _endTempWasser - _startTempWasser;
  double _startTempEisen = 20; // Grad Celcius
  double _endTempEisen = 700; // Grad Celcius --> hier glüht Eisen
  double get eisenTempDif => _endTempEisen - _startTempEisen;

  final double _cEisen =
      449; // J pro KG * K --> 1KG Eisen braucht 449 Joule um 1 Grad erhitzt zu werden
  final double _cWasser =
      4181; // J pro KG * K --> 1KG / 1L Wasser braucht 4181 Joule um 1 Grad erhöht zu werden

  // Getter
  double get hDif => _endH - _startH;

  double get gDif => _endG - _startG;

  double get eLage => _masse * _g * hDif; // kg*m / s^2*m = Joule
  double get eBewegung => (_masse * (gDif * gDif)) / 2; // kg*(m/s)^2 = Joule

  double get literWasser => ((eLage + eBewegung) / _cWasser) / wasserTempDif;

  double get kgEisen => ((eLage + eBewegung) / _cEisen) / eisenTempDif;

  // Setter
  void setStartH(double h) {
    _startH = h;
    notifyListeners();
  }

  void setEndH(double h) {
    _endH = h;
    notifyListeners();
  }

  void setStartGes(double ges) {
    _startG = ges;
    notifyListeners();
  }

  void setEndGes(double ges) {
    _endG = ges;
    notifyListeners();
  }

  void setMasse(double m) {
    _masse = m;
    notifyListeners();
  }
}