# include "dvoshell.h"

int avextract (int argc, char **argv) {
  
  int i, j, n, m, N, Npts, NPTS, last, next, state, Nfields, Nreturn, Ncstack, Nstack;
  int Nsecfilt, mode, VERBOSE;
  char **cstack, name[1024];
  float *values;
  void *Signal;

  Catalog catalog;
  SkyList *skylist;
  SkyRegionSelection *selection;
  PhotCode *code;
  Vector **vec;
  dbField *fields;
  dbStack *stack;

  /* defaults */
  skylist = NULL;
  selection = NULL;
  code = NULL;
  mode = MAG_AVE;
  fields = NULL;
  stack = NULL;

  if ((N = get_argument (argc, argv, "-h"))) goto help;
  if ((N = get_argument (argc, argv, "--help"))) goto help;

  VERBOSE = FALSE;
  if ((N = get_argument (argc, argv, "-v"))) {
    remove_argument (N, &argc, argv);
    VERBOSE = TRUE;
  }

  dvo_catalog_init (&catalog, TRUE);

  /* load photcode information */
  if (!InitPhotcodes ()) goto escape;
  Nsecfilt = GetPhotcodeNsecfilt ();

  // parse skyregion options
  if ((selection = SetRegionSelection (&argc, argv)) == NULL) goto escape;

  // command-line is of the form: avextract field,field, field [where (field op value)...]

  // parse the fields to be extracted and returned
  fields = dbCmdlineFields (argc, argv, DVO_TABLE_AVERAGE, &last, &Nfields);
  if (fields == NULL) return (FALSE);

  // examine line for 'where' or 'match to'.  'match to' is forbidden
  state = dbCmdlineConditions (argc, argv, last, &next);
  if (state == DVO_DB_CMDLINE_ERROR) goto escape;
  if (state == DVO_DB_CMDLINE_IS_MATCH) goto escape; // not allowed for mextract

  // parse the remainder of the line as a boolean math expression
  cstack = isolate_elements (argc-last, &argv[last], &Ncstack);
  
  // construct the db Boolean math stack (frees cstack)
  stack = dbRPN (Ncstack, cstack, &Nstack);

  // add the skyregion limits to the where statement (or create)
  dbAstroRegionLimits (&stack, &Nstack, selection, DVO_TABLE_AVERAGE);

  // parse stack elements into fields and scalars as needed
  Nreturn = Nfields; 
  dbCheckStack (stack, Nstack, DVO_TABLE_AVERAGE, &fields, &Nfields);
  // XXX handle errors

  /* load region corresponding to selection above */
  if ((skylist = SelectRegions (selection)) == NULL) goto escape;

  /* create output storage vectors */
  ALLOCATE (values, float, Nfields);
  ALLOCATE (vec, Vector *, Nreturn);
  for (i = 0; i < Nreturn; i++) {
    if (ISNUM(fields[i].name[0])) {
      sprintf (name, "v_%s", fields[i].name);
    } else {
      sprintf (name, "%s", fields[i].name);
    }
    if ((vec[i] = SelectVector (name, ANYVECTOR, TRUE)) == NULL) goto escape;
  }

  Npts = 0;
  NPTS = 1;

  // grab data from all selected sky regions
  Signal = signal (SIGINT, handle_interrupt);
  interrupt = FALSE;
  for (i = 0; (i < skylist[0].Nregions) && !interrupt; i++) {
    /* lock, load, unlock catalog */
    catalog.filename = skylist[0].filename[i];
    catalog.catflags = LOAD_AVES | LOAD_MEAS | LOAD_SECF;
    catalog.Nsecfilt = 0;

    if (VERBOSE) gprint (GP_ERR, "trying %s (%d of %d)\n", catalog.filename, i, skylist[0].Nregions);
      
    // an error exit status here is a significant error
    if (!dvo_catalog_open (&catalog, NULL, FALSE, "r")) {
      gprint (GP_ERR, "ERROR: failure to open catalog file %s\n", catalog.filename);
      exit (2);
    }
    dvo_catalog_unlock (&catalog);

    for (j = 0; (j < catalog.Naverage) && !interrupt; j++) {
      // extract the relevant values
      // XXX for measure values, this could be optimized for one loop over measures...

      m = catalog.average[j].measureOffset;
      dbExtractAveragesInit (); // reset counters for saved fields 
      for (n = 0; n < Nfields; n++) {
	values[n] = dbExtractAverages (&catalog.average[j], &catalog.secfilt[j*Nsecfilt], &catalog.measure[m], &fields[n]);
      }
      // test the conditional statement
      if (!dbBooleanCond (stack, Nstack, values)) continue;
      for (n = 0; n < Nreturn; n++) {
	vec[n][0].elements[Npts] = values[n];
      }
      Npts++;
      if (Npts >= NPTS) {
	NPTS += 2000;
	for (n = 0; n < Nreturn; n++) {
	  REALLOCATE (vec[n][0].elements, float, NPTS);
	}
      }
    }
    dvo_catalog_free (&catalog);
  }
  signal (SIGINT, Signal);
  interrupt = FALSE;
  for (n = 0; n < Nreturn; n++) {
    vec[n][0].Nelements = Npts;
    REALLOCATE (vec[n][0].elements, float, MAX(1,Npts));
  }

  dbFreeFields (fields, Nfields);
  dbFreeStack (stack, Nstack);
  free (stack);
  SkyListFree (skylist);
  FreeSkyRegionSelection (selection);
  return (TRUE);

 escape:
  dbFreeFields (fields, Nfields);
  dbFreeStack (stack, Nstack);
  free (stack);
  SkyListFree (skylist);
  FreeSkyRegionSelection (selection);
  dvo_catalog_free (&catalog);
  return (FALSE);

 help:
  gprint (GP_ERR, "USAGE: avextract field[,field,field...] where (expression)\n");

  if ((argc > N + 1) && !strcasecmp (argv[N+1], "fields")) {
    gprint (GP_ERR, " USAGE: avextract field[,field,field...] where (expression)\n");
    gprint (GP_ERR, "  RA : right ascension (J2000)\n");
    gprint (GP_ERR, "  DEC : declination \n");
    gprint (GP_ERR, "  dRA : ra scatter \n");
    gprint (GP_ERR, "  dDEC : dec scatter\n");
    gprint (GP_ERR, "  uRA : proper motion in ra\n");
    gprint (GP_ERR, "  uDEC : proper motion in dec\n");
    gprint (GP_ERR, "  duRA : proper motion error in ra\n");
    gprint (GP_ERR, "  duDEC : proper motion error in dec\n");
    gprint (GP_ERR, "  PAR : parallax\n");
    gprint (GP_ERR, "  dPAR : parallax error \n");
    gprint (GP_ERR, "  nmeas : number of measurements\n");
    gprint (GP_ERR, "  nmiss : number of non-detections\n");
    gprint (GP_ERR, "  xp : positional chi-square\n");
    gprint (GP_ERR, "  flag : object flags\n");
    gprint (GP_ERR, "  photocode:ave : average magnitude for photcode\n");
    gprint (GP_ERR, "  photocode:ref : reference magnitude system for photcode\n");
    gprint (GP_ERR, "  photocode:inst : first instrumental magnitude for photcode\n");
    gprint (GP_ERR, "  photocode:cat : first catalog magnitude for photcode\n");
    gprint (GP_ERR, "  photocode:sys : first system magnitude for photcode\n");
    gprint (GP_ERR, "  photocode:rel : first relative magnitude for photcode\n");
    gprint (GP_ERR, "  photocode:cal : first calibrated magnitude for photcode \n");
    gprint (GP_ERR, "  photcode:err : magnitude error for photcode\n");
    gprint (GP_ERR, "  photcode:chipsq : chi-square of magnitude fit\n");
    gprint (GP_ERR, "  type : dophot type (unused)\n");
    gprint (GP_ERR, "  typefrac : dophot type fraction (unused)\n");
    gprint (GP_ERR, "  photcode:ncode : number of measurements in photcode \n");
    gprint (GP_ERR, "  photcode:nphot : number of measurements used for photcode average\n");
    return (FALSE);
  }
  gprint (GP_ERR, " avextract --help fields : for a complete listing of allowed fields\n");
  return (FALSE);
}
