/*============================================================================

    WCSLIB 4.3 - an implementation of the FITS WCS standard.
    Copyright (C) 1995-2007, Mark Calabretta

    This file is part of WCSLIB.

    WCSLIB is free software: you can redistribute it and/or modify it under
    the terms of the GNU Lesser General Public License as published by the
    Free Software Foundation, either version 3 of the License, or (at your
    option) any later version.

    WCSLIB is distributed in the hope that it will be useful, but WITHOUT ANY
    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
    FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
    more details.

    You should have received a copy of the GNU Lesser General Public License
    along with WCSLIB.  If not, see <http://www.gnu.org/licenses/>.

    Correspondence concerning WCSLIB may be directed to:
       Internet email: mcalabre@atnf.csiro.au
       Postal address: Dr. Mark Calabretta
                       Australia Telescope National Facility, CSIRO
                       PO Box 76
                       Epping NSW 1710
                       AUSTRALIA

    Author: Mark Calabretta, Australia Telescope National Facility
    http://www.atnf.csiro.au/~mcalabre/index.html
    $Id: tpih1.c,v 4.3 2007/12/27 05:35:51 cal103 Exp $
*=============================================================================
*
*   tpih1 tests wcspih(), the WCS FITS parser for image headers, and
*   wcsfix(), which translates non-standard constructs.  It reads a test
*   header and uses wcsprt() to print the resulting wcsprm structs.
*
*   Input comes from file "pih.fits" using either fits_hdr2str() from CFITSIO
*   if the DO_CFITSIO preprocessor is defined, or read directly using fgets()
*   otherwise.
*
*---------------------------------------------------------------------------*/

#include <wcsconfig_tests.h>

#include <stdio.h>
#include <string.h>

#if defined HAVE_CFITSIO && defined DO_CFITSIO
#include <fitsio.h>
#endif

#include <wcs.h>
#include <wcshdr.h>
#include <wcsfix.h>

int main()

{
   char infile[] = "pih.fits";
   char a, *hptr;
   int  alts[27], ctrl, ialt, iblock, ifix, ikeyrec, iwcs, nkeyrec, nreject,
        nwcs, relax, stat[NWCSFIX], status;
   struct wcsprm *wcs;
#if defined HAVE_CFITSIO && defined DO_CFITSIO
   char *header;
   fitsfile *fptr;
#else
   char keyrec[81], header[288001];
   int  gotend, k;
   FILE *fptr;
#endif


   /* Set line buffering in case stdout is redirected to a file, otherwise
    * stdout and stderr messages will be jumbled (stderr is unbuffered). */
   setvbuf(stdout, NULL, _IOLBF, 0);

   printf("Testing WCSLIB parser for FITS image headers (tpih1.c)\n"
          "------------------------------------------------------\n\n");

   /* Read in the FITS header, excluding COMMENT and HISTORY keyrecords. */
#if defined HAVE_CFITSIO && defined DO_CFITSIO
   status = 0;
   if (fits_open_file(&fptr, infile, READONLY, &status)) {
      fits_report_error(stderr, status);
      return 1;
   }

   if (fits_hdr2str(fptr, 1, NULL, 0, &header, &nkeyrec, &status)) {
      fits_report_error(stderr, status);
      return 1;
   }

   fits_close_file(fptr, &status);
#else
   if ((fptr = fopen(infile, "r")) == 0) {
      fprintf(stderr, "ERROR opening %s\n", infile);
      return 1;
   }

   k = 0;
   nkeyrec = 0;
   gotend = 0;
   for (iblock = 0; iblock < 100; iblock++) {
      for (ikeyrec = 0; ikeyrec < 36; ikeyrec++) {
         if (fgets(keyrec, 81, fptr) == 0) {
            break;
         }

         if (strncmp(keyrec, "        ", 8) == 0) continue;
         if (strncmp(keyrec, "COMMENT ", 8) == 0) continue;
         if (strncmp(keyrec, "HISTORY ", 8) == 0) continue;

         strncpy(header+k, keyrec, 80);
         k += 80;
         nkeyrec++;

         if (strncmp(keyrec, "END     ", 8) == 0) {
            /* An END keyrecord was read, but read the rest of the block. */
            gotend = 1;
         }
      }

      if (gotend) break;
   }
   fclose(fptr);
#endif

   fprintf(stderr, "Found %d non-comment header keyrecords.\n\n", nkeyrec);


   /* Parse the header, allowing all recognized non-standard WCS keywords and
    * usage.  All WCS keyrecords are culled from the header, illegal ones are
    * reported. */
   relax = WCSHDR_all;
   ctrl  = -2;
   fprintf(stderr, "\nIllegal-WCS header keyrecords rejected by wcspih():\n");
   if ((status = wcspih(header, nkeyrec, relax, ctrl, &nreject, &nwcs,
                        &wcs))) {
      fprintf(stderr, "wcspih ERROR %d: %s.\n", status, wcs_errmsg[status]);
   }
   if (!nreject) fprintf(stderr, "(none)\n");


   /* List the remaining keyrecords. */
   printf("\n\nNon-WCS header keyrecords not used by wcspih():\n");
   hptr = header;
   while (*hptr) {
      printf("%.80s\n", hptr);
      hptr += 80;
   }
#if defined HAVE_CFITSIO && defined DO_CFITSIO
   free(header);
#endif


   /* Summarize what was found. */
   status = wcsidx(nwcs, &wcs, alts);
   printf("\n\nFound %d alternate coordinate descriptions with indices:\n  ",
          nwcs);
   for (a = 'A'; a <= 'Z'; a++) {
      printf("%2c", a);
   }
   printf("\n");
   for (ialt = 0; ialt < 27; ialt++) {
      if (alts[ialt] < 0) {
         printf(" -");
      } else {
         printf("%2d", alts[ialt]);
      }
   }
   printf("\n");


   /* Fix non-standard usage and print each of the wcsprm structs. */
   for (iwcs = 0; iwcs < nwcs; iwcs++) {
      printf("\n------------------------------------"
             "------------------------------------\n");

      /* Fix non-standard WCS keyvalues. */
      if ((status = wcsfix(7, 0, wcs+iwcs, stat))) {
         printf("wcsfix ERROR, status returns: (");
         for (ifix = 0; ifix < NWCSFIX; ifix++) {
            printf(ifix ? ", %d" : "%d", stat[ifix]);
         }
         printf(")\n\n");
      }

      if ((status = wcsset(wcs+iwcs))) {
         fprintf(stderr, "wcsset ERROR %d: %s.\n", status,
                 wcs_errmsg[status]);
         continue;
      }

      if ((status = wcsprt(wcs+iwcs))) {
         fprintf(stderr, "wcsprt ERROR %d: %s.\n", status,
                 wcs_errmsg[status]);
      }
   }

   status = wcsvfree(&nwcs, &wcs);

   return 0;
}