OperatingCost.h

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#pragma once
 
#include <cmath>
#include <functional>
#include <stdexcept>
#include <vector>
 
class OperatingCost {
  public:
    OperatingCost(double motorBhp, double bhpUnloaded, double annualOperatingHours, double runTimeLoaded,
                  double efficiencyLoaded, double efficiencyUnloaded, double costOfElectricity)
        : motorBhp(motorBhp), bhpUnloaded(bhpUnloaded), annualOperatingHours(annualOperatingHours),
          runTimeLoaded(runTimeLoaded), efficiencyLoaded(efficiencyLoaded), efficiencyUnloaded(efficiencyUnloaded),
          costOfElectricity(costOfElectricity) {}
 
    struct Output {
        Output(const double runTimeUnloaded, const double costForLoaded, const double costForUnloaded,
               const double totalAnnualCost)
            : runTimeUnloaded(runTimeUnloaded), costForLoaded(costForLoaded), costForUnloaded(costForUnloaded),
              totalAnnualCost(totalAnnualCost) {}
 
        const double runTimeUnloaded, costForLoaded, costForUnloaded, totalAnnualCost;
    };
 
    Output calculate() {
        auto const runTimeUnloaded = 100 - runTimeLoaded;
        auto const costForLoaded =
            (motorBhp * 0.746 * annualOperatingHours * costOfElectricity * (runTimeLoaded / 100)) /
            (efficiencyLoaded / 100);
        auto const costForUnloaded = (motorBhp * 0.746 * annualOperatingHours * costOfElectricity *
                                      (bhpUnloaded / 100) * (runTimeUnloaded / 100)) /
                                     (efficiencyUnloaded / 100);
        return {runTimeUnloaded, costForLoaded, costForUnloaded, costForLoaded + costForUnloaded};
    }
 
  private:
    double motorBhp, bhpUnloaded, annualOperatingHours, runTimeLoaded, efficiencyLoaded;
    double efficiencyUnloaded, costOfElectricity;
};