#include "control_ng.h"

#include <sys/types.h>
#include <sys/socket.h>

#include "obj.h"
#include "poller.h"
#include "bencode.h"
#include "log.h"
#include "cookie_cache.h"
#include "call.h"
#include "sdp.h"
#include "call_interfaces.h"


static void pretty_print(bencode_item_t *el, GString *s) {
	bencode_item_t *chld;
	const char *sep;

	switch (el->type) {
		case BENCODE_STRING:
			g_string_append(s, "\"");
			g_string_append_len(s, el->iov[1].iov_base, el->iov[1].iov_len);
			g_string_append(s, "\"");
			break;

		case BENCODE_INTEGER:
			g_string_append_printf(s, "%lli", el->value);
			break;

		case BENCODE_LIST:
			sep = "[ ";
			for (chld = el->child; chld; chld = chld->sibling) {
				g_string_append(s, sep);
				pretty_print(chld, s);
				sep = ", ";
			}
			g_string_append(s, " ]");
			break;

		case BENCODE_DICTIONARY:
			sep = "{ ";
			for (chld = el->child; chld; chld = chld->sibling) {
				g_string_append(s, sep);
				pretty_print(chld, s);
				g_string_append(s, ": ");
				chld = chld->sibling;
				pretty_print(chld, s);
				sep = ", ";
			}
			g_string_append(s, " }");
			break;

		default:
			abort();
	}
}

struct control_ng_stats* get_control_ng_stats(struct control_ng* c, struct sockaddr_in6* sin) {

	// seems to be the first address
	if (!c->callmaster->control_ng_stats) {
		c->callmaster->control_ng_stats = malloc(sizeof(struct control_ng_stats));
		memset(c->callmaster->control_ng_stats,0,sizeof(struct control_ng_stats));
		memcpy(&(c->callmaster->control_ng_stats->proxy),sin,sizeof(struct sockaddr_in6));
		char buf[128]; memset(&buf,0,128);
	    smart_ntop_p(buf, &sin->sin6_addr, sizeof(buf));
		ilog(LOG_INFO,"Adding a first proxy for control ng stats:%s\n",buf);
		return c->callmaster->control_ng_stats;
	}

	struct control_ng_stats* cur = c->callmaster->control_ng_stats;
	struct control_ng_stats* last;

	while (cur) {
		last = cur;
		if (memcmp((const void*)(&(cur->proxy.sin6_addr)),(const void*)(&(sin->sin6_addr)),sizeof(struct in6_addr))==0) {
			ilog(LOG_DEBUG,"Already found proxy for control ng stats.\n");
			return cur;
		}
		cur = cur->next;
	}

	// add a new one
	char buf[128]; memset(&buf,0,128);
    smart_ntop_p(buf, &sin->sin6_addr, sizeof(buf));
	ilog(LOG_INFO,"Adding a new proxy for control ng stats:%s\n",buf);

	cur = malloc(sizeof(struct control_ng_stats));
	memset(cur,0,sizeof(struct control_ng_stats));
	memcpy(cur,sin,sizeof(struct sockaddr_in6));
	last->next = cur;

	return cur;
}

static void control_ng_incoming(struct obj *obj, str *buf, struct sockaddr_in6 *sin, char *addr) {
	struct control_ng *c = (void *) obj;
	bencode_buffer_t bencbuf;
	bencode_item_t *dict, *resp;
	str cmd, cookie, data, reply, *to_send;
	const char *errstr;
	struct msghdr mh;
	struct iovec iov[3];
	GString *log_str;

	struct control_ng_stats* cur = get_control_ng_stats(c,sin);

	str_chr_str(&data, buf, ' ');
	if (!data.s || data.s == buf->s) {
		ilog(LOG_WARNING, "Received invalid data on NG port (no cookie) from %s: "STR_FORMAT, addr, STR_FMT(buf));
		return;
	}

	bencode_buffer_init(&bencbuf);
	resp = bencode_dictionary(&bencbuf);

	cookie = *buf;
	cookie.len -= data.len;
	*data.s++ = '\0';
	data.len--;

	errstr = "Invalid data (no payload)";
	if (data.len <= 0)
		goto err_send;

	to_send = cookie_cache_lookup(&c->cookie_cache, &cookie);
	if (to_send) {
		ilog(LOG_INFO, "Detected command from %s as a duplicate", addr);
		resp = NULL;
		goto send_only;
	}

	dict = bencode_decode_expect_str(&bencbuf, &data, BENCODE_DICTIONARY);
	errstr = "Could not decode dictionary";
	if (!dict)
		goto err_send;

	bencode_dictionary_get_str(dict, "command", &cmd);
	errstr = "Dictionary contains no key \"command\"";
	if (!cmd.s)
		goto err_send;

	log_str = g_string_sized_new(256);
	g_string_append_printf(log_str, "Got valid command from %s: %.*s - ", addr, STR_FMT(&cmd));
	pretty_print(dict, log_str);
	ilog(LOG_INFO, "%.*s", (int) log_str->len, log_str->str);
	g_string_free(log_str, TRUE);

	errstr = NULL;
	if (!str_cmp(&cmd, "ping")) {
		bencode_dictionary_add_string(resp, "result", "pong");
		cur->ping++;
	}
	else if (!str_cmp(&cmd, "offer")) {
		errstr = call_offer_ng(dict, c->callmaster, resp, addr, sin);
		cur->offer++;
	}
	else if (!str_cmp(&cmd, "answer")) {
		errstr = call_answer_ng(dict, c->callmaster, resp);
		cur->answer++;
	}
	else if (!str_cmp(&cmd, "delete")) {
		errstr = call_delete_ng(dict, c->callmaster, resp);
		cur->delete++;
	}
	else if (!str_cmp(&cmd, "query")) {
		errstr = call_query_ng(dict, c->callmaster, resp);
		cur->query++;
	}
#if GLIB_CHECK_VERSION(2,16,0)
	else if (!str_cmp(&cmd, "list")) {
	    errstr = call_list_ng(dict, c->callmaster, resp);
	    cur->list++;
	}
#endif
	else
		errstr = "Unrecognized command";

	if (errstr)
		goto err_send;

	goto send_resp;

err_send:
	ilog(LOG_WARNING, "Protocol error in packet from %s: %s ["STR_FORMAT"]", addr, errstr, STR_FMT(&data));
	bencode_dictionary_add_string(resp, "result", "error");
	bencode_dictionary_add_string(resp, "error-reason", errstr);
	cur->errors++;
	goto send_resp;

send_resp:
	bencode_collapse_str(resp, &reply);
	to_send = &reply;

send_only:
	ilog(LOG_INFO, "Returning to SIP proxy: "STR_FORMAT, STR_FMT(to_send));

	ZERO(mh);
	mh.msg_name = sin;
	mh.msg_namelen = sizeof(*sin);
	mh.msg_iov = iov;
	mh.msg_iovlen = 3;

	iov[0].iov_base = cookie.s;
	iov[0].iov_len = cookie.len;
	iov[1].iov_base = " ";
	iov[1].iov_len = 1;
	iov[2].iov_base = to_send->s;
	iov[2].iov_len = to_send->len;

	sendmsg(c->udp_listener.fd, &mh, 0);

	if (resp)
		cookie_cache_insert(&c->cookie_cache, &cookie, &reply);
	else
		free(to_send);

	goto out;

out:
	bencode_buffer_free(&bencbuf);
	log_info_clear();
}



struct control_ng *control_ng_new(struct poller *p, struct in6_addr ip, u_int16_t port, struct callmaster *m) {
	struct control_ng *c;

	if (!p || !m)
		return NULL;

	c = obj_alloc0("control_ng", sizeof(*c), NULL);

	c->callmaster = m;
	cookie_cache_init(&c->cookie_cache);

	if (udp_listener_init(&c->udp_listener, p, ip, port, control_ng_incoming, &c->obj))
		goto fail2;

	return c;

fail2:
	obj_put(c);
	return NULL;

}