#include <stdlib.h>
#include <unistd.h>
#include <grass/gis.h>
#include "method.h"

int 
o_max (char *basemap, char *covermap, char *outputmap, int usecats, struct Categories *cats)
{
    char command[1024];
    FILE *stats, *reclass;
    int first;
    long basecat, covercat, catb, catc;

    sprintf(command, "r.stats -n input='%s,%s' fs=space", basemap, covermap);
    stats = popen (command, "r");

    sprintf (command, "r.reclass i='%s' o='%s'", basemap, outputmap);
    reclass = popen (command, "w");

    first = 1;
    
    while (fscanf (stats, "%ld %ld", &basecat, &covercat) == 2)
    {
	if (first)
	{
	    first = 0;
	    catb  = basecat;
	    catc  = covercat;
	}
	
	if (basecat != catb)
	{
            write_reclass (reclass, catb, catc, G_get_cat (catc, cats), usecats);
	    catb = basecat;
	    catc = covercat;
	}

	if (covercat > catc)
	    catc = covercat;
    }
    
    if (first)
    {
	catb = catc = 0;
    }
    
    write_reclass (reclass, catb, catc, G_get_cat (catc, cats), usecats);
    
    pclose (stats);
    pclose (reclass);

    return(0);
}