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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 */
/*ParseAgn parse parameters for the AGN continuum shape command */
#include "cddefines.h"
#include "rfield.h"
#include "parse.h"
#include "physconst.h"

void ParseAgn(char *chCard)
{
        bool lgEOL;
        long int i;
        double BigBump, 
          Ratio, 
          XRays, 
          xnu;

        DEBUG_ENTRY( "ParseAgn()" );

        /* this radiation field will be something like an AGN */
        strcpy( rfield.chSpType[rfield.nspec], "AGN  " );

        /* there were no numbers on the line - this could be the Kirk option,
                * to use the numbers for the continuum in the atlas paper */
        if( nMatch("KIRK",chCard) )
        {
                /* million degree cutoff, but in rydbergs */
                rfield.slope[rfield.nspec] = 1e6 /  TE1RYD;

                /* cutoff is second parameter is really alpha ox */
                rfield.cutoff[rfield.nspec][0] = -1.40;

                /* bb slope is third parameter */
                rfield.cutoff[rfield.nspec][1] = -0.50;

                /* slope of X-Ray component is last parameter */
                rfield.cutoff[rfield.nspec][2] = -1.0;
        }
        else
        {
                /* first parameter is temperature of big bump
                * second parameter is alpha ox */
                i = 5;
                /* slope is first parameter is really temperature of bump */
                rfield.slope[rfield.nspec] = FFmtRead(chCard,&i,INPUT_LINE_LENGTH,&lgEOL);
                if( lgEOL )
                {

                        fprintf( ioQQQ, " The big bump temperature should have been on this line.   Sorry.\n" );
                        cdEXIT(EXIT_FAILURE);
                }

                if( rfield.slope[rfield.nspec] <= 0. )
                {
                        fprintf( ioQQQ, " Non positive temperature not allowed.   Sorry.\n" );
                        cdEXIT(EXIT_FAILURE);
                }

                /* temps are log if first le 10 */
                if( rfield.slope[rfield.nspec] <= 10. )
                        rfield.slope[rfield.nspec] = 
                        pow(10.,rfield.slope[rfield.nspec]);

                /* want cutoff in ryd not kelvin */
                rfield.slope[rfield.nspec] /= TE1RYD;

                /* cutoff is second parameter is really alpha ox */
                rfield.cutoff[rfield.nspec][0] = FFmtRead(chCard,&i,INPUT_LINE_LENGTH, &lgEOL);
                if( lgEOL )
                {
                        fprintf( ioQQQ, " alpha ox should have been on this line.   Sorry.\n" );
                        cdEXIT(EXIT_FAILURE);
                }

                if( rfield.cutoff[rfield.nspec][0] > 3. || 
                        rfield.cutoff[rfield.nspec][0] < -3. )
                {
                        fprintf( ioQQQ, " An alpha ox of%10.2e looks funny to me.  Check Hazy to make sure its ok.\n", 
                        rfield.cutoff[rfield.nspec][0] );
                }

                if( rfield.cutoff[rfield.nspec][0] >= 0. )
                {
                        fprintf( ioQQQ, " The sign of alpha ox is almost certainly incorrect.   Check Hazy.\n" );
                }

                /* bb slope is third parameter */
                rfield.cutoff[rfield.nspec][1] = FFmtRead(chCard,&i,INPUT_LINE_LENGTH, &lgEOL);
                if( lgEOL )
                        rfield.cutoff[rfield.nspec][1] = -0.5f;

                /* slope of X-Ray component is last parameter */
                rfield.cutoff[rfield.nspec][2] = FFmtRead(chCard,&i,INPUT_LINE_LENGTH, &lgEOL);
                if( lgEOL )
                        rfield.cutoff[rfield.nspec][2] = -1.0f;
        }

        /* 403.3 is ratio of energies where alpha ox defined,
         * assumed to be 2500A and 2keV */
        Ratio = pow(403.3,rfield.cutoff[rfield.nspec][0] - 1.);

        /* following code must be kept parallel with ffun1 */
        xnu = 0.3645;
        BigBump = pow(xnu,-1. + rfield.cutoff[rfield.nspec][1])*
          sexp(xnu/rfield.slope[rfield.nspec]);
        xnu = 147.;

        /* XRays = xnu**(-2.) */
        XRays = pow(xnu,rfield.cutoff[rfield.nspec][2] - 1.);
        if( BigBump <= 0. )
        {
                fprintf( ioQQQ, " Big Bump had zero flux at .3645 Ryd.\n" );
                cdEXIT(EXIT_FAILURE);
        }
        rfield.cutoff[rfield.nspec][0] = (Ratio/(XRays/BigBump));

        /* lastly increment number of spectra and check that we still have room in the vector */
        ++rfield.nspec;
        if( rfield.nspec >= LIMSPC )
        {
                fprintf( ioQQQ, " Too many continua entered; increase LIMSPC\n" );
                cdEXIT(EXIT_FAILURE);
        }
        return;
}

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