Units.h

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#ifndef UNITS_H
#define UNITS_H

#include "GlobalConstants.h"
#include "CoolPropTools.h"
#include "CPExceptions.h"


class StandardUnit
{
protected:
        double SI_val;

public:
        virtual ~StandardUnit(){};
        virtual void set_SI(double val) = 0;
};

class PressureUnit : public StandardUnit
{
public:
        double kPa, Pa, bar;

        PressureUnit(){};
        PressureUnit(double val, int unit)
        {
                // Convert given units to Pa
                switch (unit)
                {
                case UNIT_PA: 
                        break;
                case UNIT_KPA:
                        val *= 1000;
                        break;
                case UNIT_BAR:
                        val *= 1e5;
                        break;
                default:
                        throw ValueError(format("Your unit [%d] is not a pressure unit",unit).c_str());
                        break;
                };
                // Set the internal variable using Pa units
                set_SI(val);
        };
        void set_in_unit_system(double val, int unit_system)
        {
                // Convert given units to Pa
                switch (unit_system)
                {
                case UNIT_SYSTEM_SI:
                        break;
                case UNIT_SYSTEM_KSI:
                        val *= 1000;
                        break;
                default:
                        throw ValueError(format("Your unit system [%d] is not valid",unit_system).c_str());
                        break;
                };
                set_SI(val);
        };
        double get_in_unit_system(int unit_system)
        {
                // Convert given units to Pa
                switch (unit_system)
                {
                case UNIT_SYSTEM_SI: 
                        return Pa;
                case UNIT_SYSTEM_KSI:
                        return kPa;
                default:
                        throw ValueError(format("Your unit system [%d] is not valid",unit_system).c_str());
                        break;
                };
                return _HUGE;
        };

        double get_SI(void)     { return SI_val; };
        void set_SI(double SI_val)
        {
                this->SI_val = SI_val;
                Pa = SI_val;
                kPa = SI_val/1000;
                bar = SI_val/1e5;
        };
};

double convert_from_unit_system_to_SI(long iInput, double value, int old_system);
double convert_from_SI_to_unit_system(long iInput, double value, int new_system);
double convert_from_SI_to_unit_system(std::string input, double value, std::string new_system);
double convert_from_unit_system_to_SI(std::string input, double value, std::string old_system);
double convert_from_SI_to_unit_system(char *input, double value, char *new_system);
double convert_from_unit_system_to_SI(char *input, double value, char *old_system);

// Get a conversion factor from SI to the unit system for string
// Example num = "T*T" is units of temperature^2, or "P*P" is pressure^2 or "T/P" is temperature/pressure
double conversion_factor(std::string num);

#endif