/**
 * Copyright 2005-2007 ECMWF
 * 
 * Licensed under the GNU Lesser General Public License which
 * incorporates the terms and conditions of version 3 of the GNU
 * General Public License.
 * See LICENSE and gpl-3.0.txt for details.
 */

/*
 * C Implementation: get
 *
 * Description: how to get values using keys.
 *
 * Author: Enrico Fucile <enrico.fucile@ecmwf.int>
 *
 *
 */
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>

#include "grib_api.h"

int main(int argc, char** argv) {
	int err = 0;

	size_t i = 0;
	size_t count;
	size_t size;

	long numberOfContributingSpectralBands;
	long values[1024];

	FILE* in = NULL;
	char* filename = "../../data/satellite.grib";
	grib_handle *h = NULL;

	in = fopen(filename,"r");
	if(!in) {
		printf("ERROR: unable to open file %s\n",filename);
		return 1;
	}

	/* create new handle from a message in a file*/
	h = grib_handle_new_from_file(0,in,&err);
	if (h == NULL) {
		printf("Error: unable to create handle from file %s\n",filename);
	}

	numberOfContributingSpectralBands = 2;
	GRIB_CHECK(grib_set_long(h,"numberOfContributingSpectralBands",numberOfContributingSpectralBands),0);

	numberOfContributingSpectralBands = 9;
	GRIB_CHECK(grib_set_long(h,"numberOfContributingSpectralBands",numberOfContributingSpectralBands),0);

	/* get as a long*/
	GRIB_CHECK(grib_get_long(h,"numberOfContributingSpectralBands",&numberOfContributingSpectralBands),0);
	printf("numberOfContributingSpectralBands=%ld\n",numberOfContributingSpectralBands);

	/* get as a long*/
	GRIB_CHECK(grib_get_size(h,"scaledValueOfCentralWaveNumber",&count),0);
	printf("count=%ld\n",(long)count);

	assert(count < sizeof(values)/sizeof(values[0]));

	size = count;
	GRIB_CHECK(grib_get_long_array(h,"scaledValueOfCentralWaveNumber",values,&size),0);
	assert(size == count);

	for(i=0;i<count;i++)
		printf("scaledValueOfCentralWaveNumber %lu = %ld\n",(unsigned long)i,values[i]);

	for(i=0;i<count;i++)
		values[i] = -values[i]; 

	size = count;
	/* size--; */
	GRIB_CHECK(grib_set_long_array(h,"scaledValueOfCentralWaveNumber",values,size),0);
	assert(size == count);

	grib_handle_delete(h);

	fclose(in);
	return 0;
}