#ifdef _CVI_
#include <winsock2.h>
#include <ansi_c.h>
#include <toolbox.h>
#else
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <ctype.h>
#include <stdarg.h>
#endif

#include "dds.h"
#include "ad9912.h"


int ad9912_init(struct ad9912 *d, const char *hostname, double clock)
{
	int n, r;
	char buffer[256];
	int sock;
	struct sockaddr_in addr;
	struct hostent* host;	

#ifdef _CVI_
	WSADATA wsdata;
	WSAStartup(MAKEWORD(2,2), &wsdata);	
#endif
	
	d->hostname = strdup(hostname);
	d->port = 1234;
	d->clock = clock;
	
	host = gethostbyname(hostname);
	if (host == NULL)
		return -1;
  
	sock = socket(AF_INET, SOCK_STREAM, 0);
	if (sock < 0)
		return -2;

	addr.sin_family = host->h_addrtype;
	memcpy(&addr.sin_addr.s_addr, host->h_addr_list[0], host->h_length);
	addr.sin_port = htons(d->port);

	r = connect(sock, (struct sockaddr*)&addr, sizeof(addr));
	if (r < 0)
		return -3;
	
	d->fd = sock;

	/* check compatibility */
	n = snprintf(buffer, sizeof(buffer), "REVISION");
	r = msend(d->fd, buffer, n);
	if (r < 0)
		return r;
	r = mrecv(d->fd, buffer, sizeof(buffer));
	if (r < 0)
		return r;
	if (atoi(buffer) != REVISION)
		return -1;

	return 0;
}


int ad9912_set_frequency(struct ad9912 *d, unsigned channel, double f)
{
	int r;
	uint64 value = ftw(d->clock, f);
	
	/* ad9912 ignores ftw last bit */
	value = value & ~1ULL;

	r = command(d->fd, "SET CH%d:FTW0 0x%llX", channel, value);
	if (r < 0)
		return r;

	d->frequency[channel] = freq(d->clock, value);
     
	return 0;
}


int ad9912_get_frequency(struct ad9912 *d, unsigned channel, double *f)
{
	int r, n;
	uint64 value;
	char buffer[256];

	n = snprintf(buffer, sizeof(buffer), "GET CH%d:FTW0", channel);

	r = msend(d->fd, buffer, n);
	if (r < 0)
		return r;

	r = mrecv(d->fd, buffer, sizeof(buffer));
	if (r < 0)
		return r;

	r = strtouint64(buffer, &value);
	if (r < 0)
		return r;

	d->frequency[channel] = freq(d->clock, value);
	if (f)
		*f = d->frequency[channel];

	return 0;
}


/**
 * Ramp DDS frequency from @f1 to @f2 in steps @fstep with 0.01
 * seconds delay after each step.
 */
int ad9912_ramp_frequency2(struct ad9912 *d, unsigned channel, double f1, double f2, double fstep)
{
	const int delay = 10000;
	
	/* f2 > f1 */
	while ((f2 - f1) > fstep) {
		f1 += fstep;
		ad9912_set_frequency(d, channel, f1);
		usleep(delay);
	}
	
	/* f2 < f1 */
	while ((f1 - f2) > fstep) {
		f1 -= fstep;
		ad9912_set_frequency(d, channel, f1);
		usleep(delay);
	}
	
	/* final adjustment */
	ad9912_set_frequency(d, channel, f2);
	return 0;
}


int ad9912_ramp_frequency(struct ad9912 *d, unsigned channel, double f, double fstep)
{
	return ad9912_ramp_frequency2(d, channel, d->frequency[channel], f, fstep);
}