import 'package:flutter/material.dart';

class EnergyModelProvider with ChangeNotifier {
  double potentialEnergy = 0,
      kineticEnergy = 0,
      energyInJoule = 0,
      literWaterToHeat = 0,
      kilogrammIronToHeat = 0;

  EnergyModelProvider() {}

  /// E = kg * (m^2 / s^2)
  double calculateEnergyInJoule(String weightValue, String velocity) {
    double weightValueInDouble = double.parse(weightValue);
    double velocityInDouble = double.parse(velocity);

    energyInJoule = (velocityInDouble * velocityInDouble) / weightValueInDouble;
    notifyListeners();

    return energyInJoule;
  }

  ///  E = m * g * h in Joule
  void calculateEnergyPotential(String weightValue, String altitudeChange) {
    double weightValueInDouble = double.parse(weightValue);
    double altitudeChangeInDouble = double.parse(altitudeChange);

    potentialEnergy = weightValueInDouble * 9.81 * altitudeChangeInDouble;
    notifyListeners();
  }

  /// E = 1/2 * m * v^2 in Joule
  void calculateEnergyKinetic(String weightValue, String velocity) {
    double weightValueInDouble = double.parse(weightValue);
    double velocityInDouble = double.parse(velocity);

    kineticEnergy =
        0.5 * weightValueInDouble * (velocityInDouble * velocityInDouble);
    notifyListeners();
  }

  /**
   * E = c * m * delta T
   * c = spezifische Wärmekapazität Wasser 4,182 kJ/l
   * m = Masse
   * delta T = Temperaturunterschied
   */
  void calculateLiterToHeatWater() {
    // 4182 J = 1l = 1000kg Waasser um 1° zu erwaermen
    // E/c/delta T = m
    //Total Energie = Potentielle Energie + Kinetische Energie
    literWaterToHeat = (potentialEnergy + kineticEnergy) / (4182 * 80);
    notifyListeners();
  }

  void calculateKgToHeatIron() {
    kilogrammIronToHeat = (potentialEnergy + kineticEnergy) / (460 * 680);
    notifyListeners();
  }
}