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/* This file is part of Cloudy and is copyright (C)1978-2008 by Gary J. Ferland and
 * others.  For conditions of distribution and use see copyright notice in license.txt */
/*atoms_fe2ovr compute FeII overlap with Lya */
/*fe2par evaluate FeII partition function */
#include "cddefines.h"
#include "doppvel.h"
#include "dense.h"
#include "rfield.h"
#include "iso.h"
#include "phycon.h"
#include "hydrogenic.h"
#include "ipoint.h"
#include "opacity.h"
#include "radius.h"
#include "atomfeii.h"
#include "thirdparty.h"

const double WLAL = 1215.6845;

/* There are 373 transitions:
 * Wavelength (A)
 * absorption oscillator strength
 * Energy of lower level (Ryd)
 * Statistical weight of lower level (g) */
t_fe2ovr_la::t_fe2ovr_la()
{
        DEBUG_ENTRY( "t_fe2ovr_la()" );

        const long VERSION_MAGIC = 20070717L;
        const static char chFile[] = "fe2ovr_la.dat";

        FILE *io = open_data( chFile, "r" );

        bool lgErr = false;
        long i = -1L;

        lgErr = lgErr || ( fscanf( io, "%ld", &i ) != 1 );
        if( lgErr || i != VERSION_MAGIC )
        {
                fprintf( ioQQQ, " File %s has incorrect version: %ld\n", chFile, i );
                fprintf( ioQQQ, " I expected to find version: %ld\n", VERSION_MAGIC );
                cdEXIT(EXIT_FAILURE);
        }

        double help=0;
        for( i=0; i < NFEII; i++ )
        {
                lgErr = lgErr || ( fscanf( io, "%le", &help ) != 1 );
                fe2lam[i] = (realnum)help;
        }
        for( i=0; i < NFEII; i++ )
        {
                lgErr = lgErr || ( fscanf( io, "%le", &help ) != 1 );
                fe2osc[i] = (realnum)help;
        }
        for( i=0; i < NFEII; i++ )
        {
                lgErr = lgErr || ( fscanf( io, "%le", &help ) != 1 );
                fe2enr[i] = (realnum)help;
        }
        for( i=0; i < NFEII; i++ )
        {
                lgErr = lgErr || ( fscanf( io, "%le", &help ) != 1 );
                fe2gs[i] = (realnum)help;
        }
        for( i=0; i < NFE2PR; i++ )
                lgErr = lgErr || ( fscanf( io, "%le", &fe2pt[i] ) != 1 );
        for( i=0; i < NFE2PR; i++ )
                lgErr = lgErr || ( fscanf( io, "%le", &fe2pf[i] ) != 1 );

        fclose( io );

        ASSERT( !lgErr );
        return;
}

void t_fe2ovr_la::zero_opacity()
{
        DEBUG_ENTRY( "zero_opacity()" );

        for( int i=0; i < NFEII; i++ )
        {
                Fe2PopLte[i] = 0.f;
                feopc[i] = 0.f;
                Fe2TauLte[i] = opac.taumin;
        }
        return;
}

void t_fe2ovr_la::init_pointers()
{
        DEBUG_ENTRY( "init_pointers()" );

        for( int i=0; i < NFEII; i++ )
                ipfe2[i] = ipoint(fe2enr[i]);
        return;
}

void t_fe2ovr_la::tau_inc()
{
        DEBUG_ENTRY( "tau_inc()" );

        for( int i=0; i < NFEII; i++ )
                /* optical depths for Feii dest of lya when large feii not used */
                Fe2TauLte[i] += feopc[i]*(realnum)radius.drad_x_fillfac;
        return;
}

void t_fe2ovr_la::atoms_fe2ovr(void)
{
        DEBUG_ENTRY( "atoms_fe2ovr()" );

        long int i;

        static long int nZoneEval;

        double Fe2Partn, 
          displa, 
          hopc, 
          rate, 
          weight;

        static double BigFeWidth, 
          BigHWidth, 
          oldrat;

        /* wavelength of Lya in Angstroms */

        /* compute efficiency of FeII emission overlapping with Ly-alpha
         * implemented with Fred Hamann
         *
         * make Ly-a width monotonically increasing to avoid oscillation
         * in deep regions of x-ray ionized clouds.
         *
         * do nothing if large FeII atom is used */
        if( FeII.lgFeIILargeOn )
        { 
                return;
        }

        if( nzone <= 1 )
        {
                BigHWidth = hydro.HLineWidth;
                BigFeWidth = DoppVel.doppler[ipIRON];
                nZoneEval = nzone;
        }

        /* do not do pumping if no population,line is thin, or turned off */
        if( (dense.xIonDense[ipIRON][1] <= 0. || !FeII.lgLyaPumpOn) || 
                hydro.HLineWidth <= 0. )
        {
                Fe2Partn = 0.;
                oldrat = 0.;
                hydro.dstfe2lya = 0.;

                for( i=0; i < NFEII; i++ )
                {
                        Fe2PopLte[i] = 0.;
                }
                return;
        }

        /* only evaluate this one time per zone to avoid oscillations
         * deep in x-ray ionized clouds */
        if( nZoneEval == nzone && nzone > 1 )
        { 
                return;
        }

        BigHWidth = MAX2(BigHWidth,(double)hydro.HLineWidth);
        BigFeWidth = MAX2(BigFeWidth,(double)DoppVel.doppler[ipIRON]);
        nZoneEval = nzone;

        /* check that data is linked in */
        ASSERT( fe2lam[0] > 0. );

        rate = 0.;
        Fe2Partn = fe2par(phycon.te);
        for( i=0; i < NFEII; i++ )
        {
                /* this is displacement from line center in units of Lya width */
                displa = fabs(fe2lam[i]-WLAL)/WLAL*3e10/BigHWidth;
                if( displa < 1.333 )
                {
                        /* have variable weighting factor depending on distance away
                         * this comes form the Verner's fits to Adam's results */
                        weight = ( displa <= 0.66666 ) ? 1. : MAX2(0.,1.-(displa-0.666666)/0.66666);

                        Fe2PopLte[i] = (realnum)(fe2gs[i]/Fe2Partn*rfield.ContBoltz[ipfe2[i]-1]*
                                               dense.xIonDense[ipIRON][1]);

                        feopc[i] = (realnum)(Fe2PopLte[i]*fe2osc[i]*0.0150*(fe2lam[i]*1e-8)/BigFeWidth);

                        /* Ly-alpha line-center opacity */
                        if( StatesElem[ipH_LIKE][ipHYDROGEN][ipH1s].Pop*dense.xIonDense[ipHYDROGEN][1] > 0. )
                        {
                                hopc = 7.60e-8*StatesElem[ipH_LIKE][ipHYDROGEN][ipH1s].Pop*
                                        dense.xIonDense[ipHYDROGEN][1]/DoppVel.doppler[ipHYDROGEN];
                        }
                        else
                        {
                                hopc = 7.60e-8*dense.xIonDense[ipHYDROGEN][0]/DoppVel.doppler[0];
                        }
                        rate += (feopc[i]/SDIV((feopc[i] + hopc)))*(BigFeWidth/DoppVel.doppler[ipHYDROGEN])*
                                (1. - 1./(1. + 1.6*Fe2TauLte[i]))*weight;
                }
        }

        /* dstfe2lya is total Lya deexcitation probability due to line overlap
         * damper is to stop feedback between here and hydrogen ionization sln */
        hydro.dstfe2lya = (realnum)((rate + oldrat)/2.);
        oldrat = hydro.dstfe2lya;
        return;
}

double t_fe2ovr_la::fe2par(double te)
{
        DEBUG_ENTRY( "fe2par()" );

        double fe2par_v;

        /* function to evaluate partition function for FeII
         *
         * Temperature (K) */

        if( te <= fe2pt[0] )
                fe2par_v = fe2pf[0];
        else if( te >= fe2pt[NFE2PR-1] )
                fe2par_v = fe2pf[NFE2PR-1];
        else
        {
                long i = hunt_bisect(fe2pt,NFE2PR,te);
                double slope = (fe2pf[i+1] - fe2pf[i])/(fe2pt[i+1] - fe2pt[i]);
                double du = slope*(te - fe2pt[i]);
                fe2par_v = fe2pf[i] + du;
        }
        return( fe2par_v );
}

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