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/* This file is part of Cloudy and is copyright (C)1978-2011 by Gary J. Ferland and
 * others.  For conditions of distribution and use see copyright notice in license.txt */

#ifndef FLUX_H_
#define FLUX_H_

#include "energy.h"

class Flux
{
        typedef enum {
                FU_NONE, FU_ERG_S, FU_W, FU_JY, FU_MJY, FU_MJY_SR, FU_CM2,
                FU_M2, FU_A, FU_NM, FU_MU, FU_HZ, FU_SR, FU_SQAS, FU_TOP
        } fu_flag;
        typedef bitset<FU_TOP> fu_bits;

        Energy p_energy;
        double p_flux;
        fu_bits p_userunits;

        fu_bits p_InternalFluxUnitNoCheck(const string& unit, size_t& len) const;
        fu_bits p_InternalFluxUnit(const string& unit) const;
        bool p_ValidFluxUnit(fu_bits) const;
        void p_set(Energy e, double value, fu_bits bits);
        double p_get(fu_bits bits) const;
public:
        // CONSTRUCTORS
        Flux()
        {
                set(0., 0.);
                p_userunits.reset();
        }
        Flux(Energy e, double flux)
        {
                set(e, flux);
        }
        Flux(Energy e, double flux, const string& unit)
        {
                set(e, flux, unit);
        }
        // MUTATORS
        void set(Energy e, double flux)
        {
                set( e, flux, "erg/s/cm2" );
        }
        void set(Energy e, double flux, const string& unit)
        {
                p_set( e, flux, p_InternalFluxUnit(unit) );
        }
        // ACCESSORS
        double get() const
        {
                return p_flux;
        }
        double get(const string& unit) const
        {
                return p_get( p_InternalFluxUnit(unit) );
        }
        Energy E() const
        {
                return p_energy;
        }
        string uu() const;
        friend inline bool ValidFluxUnit(const string& unit);
};

// parse standard flux unit from Cloudy input line
string StandardFluxUnit(const char*);

// check if standard unit is valid
inline bool ValidFluxUnit(const string& unit)
{
        Flux f;
        size_t p;
        Flux::fu_bits bits = f.p_InternalFluxUnitNoCheck(unit,p);
        return ( p == unit.length() && f.p_ValidFluxUnit(bits) );
}

#endif /* FLUX_H_ */

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