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#include "snmp_com_api.h"
#include "snmp_com_discovery.h"
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>



/*
	1. Provide callback function.
	2. Update the data-structure to return the contents of the sys-oid?
	3. Write a routine to initiate the discovery
	4. Data structure to store the results. (dynamically grow the list?)
	5. Dump out system information for each in list?
	6. Reverse lookup for ip-address
*/

snmp_com_errno_t 
discovery_cb(void *client_hdl, snmp_com_discovery_data *data)
{
	int i;
	// For each create our own connection.
	printf("Found target: %-16s  SYSOID: ",data->address);
	for(i=0;i<(data->oid_len - 1);i++){
		   printf("%u.",data->system_oid[i]);
	}
	printf("%u\n",data->system_oid[i]);



	return SNMP_COM_OK;
}






void
usage(char *cmd)
{
    fprintf(stderr, "USAGE: %s", cmd);
    fprintf(stderr, " [OPTIONS] START_IP END_IP\n\n");

	fprintf(stderr,
            "OPTIONS:\n");
    fprintf(stderr, "  -h, --help\t\tdisplay this help message\n");
    fprintf(stderr, "  -v 1|2c\t\tspecifies SNMP version to use\n");
    fprintf(stderr, "  -c COMMUNITY\t\tset the community string\n");
    fprintf(stderr,
            "  -m MIB[:...]\t\tload given list of MIBs (ALL loads everything)\n");
    fprintf(stderr,
            "  -M DIR[:...]\t\tlook in given list of directories for MIBs\n");
    fprintf(stderr,
            "  -t <VAL>\t\ttimeout in microseconds per snmp packet\n");
    fprintf(stderr,
            "  -r <VAL>\t\tNumber of retries per request\n");
    fprintf(stderr,
            " \n\n"); 
    fflush(stderr);

}



/*****************************************************************************/

int main (int argc, char **argv)
{
	p_snmp_disc_hdl_t		session;
	snmp_com_errno_t		res;
	char					*mibs = NULL;
	char					*mibdir = NULL;
	uint16_t				port = 161;
	long					version = 1;
	char					*community = "public";
	int						retries = 0;
	long					timeout = 0;
    int             		arg;
	char					*start_ip, *end_ip;
	int						num_found = 0;
	snmp_com_discovery_data	*disc_targets;
	int						i,j;

	// Get options at the command line (overide default values)

    while ((arg = getopt(argc, argv, "m:M:c:v:o:t:r:h-")) != EOF) {
        switch (arg) {
			case 'h':
			case '-':
				usage(argv[0]);
				return(0);
			case 't':
				timeout = atol(optarg);
				break;
			case 'r':
				retries = atol(optarg);
				break;
			case 'm':
				mibs = optarg;
				break;
			case 'M':
				mibdir = optarg;
				break;
			case 'c':
				community = optarg;
				break;
			case 'v':
				version = -1;
				if (!strcmp(optarg, "1")) {
					version = SNMP_VER_1;
				}
				if (!strcasecmp(optarg, "2c")) {
					version = SNMP_VER_2C;
				}
				// Note: V3 Support not fully in yet. Plus we need to handle the additional 
				// 	     options
				//if (!strcasecmp(optarg, "3")) {
				//	session.version = SNMP_VERSION_3;
				//}
				if (version == -1) {
					fprintf(stderr,
							"Invalid version specified after -v flag: %s\n",
							optarg);
					return (-1);
				}

				break;
			default:
				usage(argv[0]);
				return(-1);
		}

	}


	if(optind != (argc - 2)){
        fprintf(stderr, "Start end addresses required\n");
		usage(argv[0]);
		return -1;
	}

	start_ip = argv[optind++];
	end_ip = argv[optind++];


	if((res = snmp_com_discovery_init(&session,start_ip,end_ip,port,version,community,retries,timeout)) != SNMP_COM_OK)
	{
		printf("Could not initialize session: %d", res);
		return -1;
	}

	snmp_com_discovery_async(session,discovery_cb,NULL);
	snmp_com_discovery_sync(session,&num_found);

	printf("Found: %d\n",num_found);

	if((disc_targets = calloc(num_found,sizeof(snmp_com_discovery_data))) != NULL){
		snmp_com_discovery_fill(session,disc_targets,&num_found);
		for(i=0;i<num_found;i++){
			printf("Found target: %-16s  SYSOID: ",disc_targets[i].address);
			for(j=0;j<(disc_targets[i].oid_len - 1);j++){
				printf("%u.",disc_targets[i].system_oid[j]);
			}
			printf("%u\n",disc_targets[i].system_oid[j]);
		}
	}

	free(disc_targets);

	return 0;
}