/*-----------------------------------------------------------------*/
/*! 
  \file calcephinpoppositionrecord.c 
  \brief get position’s records information on INPOP/original JPL ephemeris data file 

  \author  M. Gastineau 
           Astronomie et Systemes Dynamiques, IMCCE, CNRS, Observatoire de Paris. 

   Copyright, 2017, CNRS
   email of the author : Mickael.Gastineau@obspm.fr

  History:
*/
/*-----------------------------------------------------------------*/

/*-----------------------------------------------------------------*/
/* License  of this file :
 This file is "triple-licensed", you have to choose one  of the three licenses 
 below to apply on this file.
 
    CeCILL-C
    	The CeCILL-C license is close to the GNU LGPL.
    	( http://www.cecill.info/licences/Licence_CeCILL-C_V1-en.html )
   
 or CeCILL-B
        The CeCILL-B license is close to the BSD.
        (http://www.cecill.info/licences/Licence_CeCILL-B_V1-en.txt)
  
 or CeCILL v2.1
      The CeCILL license is compatible with the GNU GPL.
      ( http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.html )
 

This library is governed by the CeCILL-C, CeCILL-B or the CeCILL license under 
French law and abiding by the rules of distribution of free software.  
You can  use, modify and/ or redistribute the software under the terms 
of the CeCILL-C,CeCILL-B or CeCILL license as circulated by CEA, CNRS and INRIA  
at the following URL "http://www.cecill.info". 

As a counterpart to the access to the source code and  rights to copy,
modify and redistribute granted by the license, users are provided only
with a limited warranty  and the software's author,  the holder of the
economic rights,  and the successive licensors  have only  limited
liability. 

In this respect, the user's attention is drawn to the risks associated
with loading,  using,  modifying and/or developing or reproducing the
software by the user in light of its specific status of free software,
that may mean  that it is complicated to manipulate,  and  that  also
therefore means  that it is reserved for developers  and  experienced
professionals having in-depth computer knowledge. Users are therefore
encouraged to load and test the software's suitability as regards their
requirements in conditions enabling the security of their systems and/or 
data to be ensured and,  more generally, to use and operate it in the 
same conditions as regards security. 

The fact that you are presently reading this means that you have had
knowledge of the CeCILL-C,CeCILL-B or CeCILL license and that you accept its terms.
*/
/*-----------------------------------------------------------------*/

#include "calcephconfig.h"
#if HAVE_STDIO_H
#include <stdio.h>
#endif
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if HAVE_STRING_H
#include <string.h>
#endif
#if HAVE_ERRNO_H
#include <errno.h>
#endif
#if HAVE_MATH_H
#include <math.h>
#endif
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif

#include "calcephdebug.h"
#include "real.h"
#define __CALCEPH_WITHIN_CALCEPH 1
#include "calceph.h"
#include "calcephinternal.h"
#include "util.h"
#include "calcephchebyshev.h"

/*--------------------------------------------------------------------------*/
/*! return the number of position’s records available in the ephemeris file 
  
  @param eph (inout) ephemeris descriptor
*/
/*--------------------------------------------------------------------------*/
int calceph_inpop_getpositionrecordcount(struct calcephbin_inpop *eph)
{
    int res = 0;

    int j;

    for (j = 0; j < 12; j++)
    {
        if (j <= 10 && eph->H1.coeffPtr[j][1] > 0 && eph->H1.coeffPtr[j][2] > 0)
            res++;
    }
    res += eph->asteroids.inforec.numAst;
    if (eph->haveTTmTDB)
        res++;

    return res;
}

/*--------------------------------------------------------------------------*/
/*! This function returns the target and origin bodies, the first and last time, 
 and the reference frame available at the specified index 
 for the position's records of the ephemeris file  associated to eph.
 
 
   return 0 on error, otherwise non-zero value.
  
  @param eph (inout) ephemeris descriptor
  @param index (in) index of the position’s record, between 1 and calceph_getpositionrecordcount()
  @param target – The target body
  @param center – The origin body
  @param firsttime (out) the Julian date of the first time available in this record, 
    expressed in the same time scale as calceph_gettimescale.
  @param lasttime (out) the Julian date of the first time available in this record,
    expressed in the same time scale as calceph_gettimescale.
  @param frame (out) reference frame
  1  = ICRF
*/
/*--------------------------------------------------------------------------*/
int calceph_inpop_getpositionrecordindex(struct calcephbin_inpop *eph, int index, int *target, int *center,
                                         double *firsttime, double *lasttime, int *frame)
{
    int res = 0;

    int j;

    *firsttime = eph->H1.timeData[0];
    *lasttime = eph->H1.timeData[1];
    *frame = 1;
    *center = NAIFID_SOLAR_SYSTEM_BARYCENTER;

    for (j = 0; j < 12; j++)
    {
        if (j <= 10 && eph->H1.coeffPtr[j][1] > 0 && eph->H1.coeffPtr[j][2] > 0)
        {
            index--;
            if (index == 0)
            {
                *target = j + 1;
                /* except for the moon and sun */
                switch (j)
                {
                    case 9:
                        *target = NAIFID_MOON;
                        *center = NAIFID_EARTH;
                        break;
                    case 10:
                        *target = NAIFID_SUN;
                        break;
                }
                return 1;
            }
        }
    }

    if (index >= 1 && index <= eph->asteroids.inforec.numAst)
    {
        *target = eph->asteroids.id_array[index - 1] + CALCEPH_ASTEROID;
        return 1;
    }
    if (eph->asteroids.inforec.numAst > 0)
    {
        index -= eph->asteroids.inforec.numAst;
    }
    if (index == 1 && eph->haveTTmTDB)
    {
        *center = NAIFID_TIME_CENTER;
        switch (eph->timescale)
        {
            case etimescale_TDB:
                *target = NAIFID_TIME_TTMTDB;
                break;

            case etimescale_TCB:
                *target = NAIFID_TIME_TCGMTCB;
                break;

            default:
                fatalerror("Unknown time scale in calceph_inpop_getpositionrecordindex\n");
                break;
        }
        res = 1;
    }
    return res;
}
