#include "global.h"
#include "rtlm.h"
#include "mqttd.h"


static inline struct tagSession *
initSession(int sock, char * __restrict addr)
{
	struct tagSession *sess = NULL;
	const char *str;

	FTRACE(5);

	if (!addr)
		return NULL;

	sess = malloc(sizeof(struct tagSession));
	if (!sess) {
		VERB(3) syslog(LOG_ERR, "Error:: in malloc #%d - %s", errno, strerror(errno));
		return NULL;
	} else
		memset(sess, 0, sizeof(struct tagSession));

	str = (const char*) cfg_GetAttribute(&cfg, CFG("mqttd"), CFG("retry"));
	if (!str)
		sess->sess_retry = DEFAULT_RETRY;
	else
		sess->sess_retry = strtol(str, NULL, 0);

	sess->sess_buf = mqtt_msgAlloc(0);
	if (!sess->sess_buf) {
		VERB(3) syslog(LOG_ERR, "Error:: in msgAlloc #%d - %s", mqtt_GetErrno(), mqtt_GetError());
		free(sess);
		return NULL;
	}

	sess->sess_sock = sock;
	strlcpy(sess->sess_addr, addr, sizeof sess->sess_addr);
	free(addr);
	return sess;
}

static void
finiSession(struct tagSession *sess)
{
	register int i;
	struct tagStore *store;

	FTRACE(5);

	if (!sess)
		return;

	for (i = 0; i < MQTT_QOS_RESERVED; i++)
		while ((store = SLIST_FIRST(&sess->sess_store[i]))) {
			SLIST_REMOVE_HEAD(&sess->sess_store[i], st_node);
			free(store);
		}

	if (sess->sess_will.msg)
		free(sess->sess_will.msg);
	if (sess->sess_will.topic)
		free(sess->sess_will.topic);

	if (sess->sess_sock > STDERR_FILENO) {
		shutdown(sess->sess_sock, SHUT_RDWR);
		close(sess->sess_sock);
	}

	mqtt_msgFree(&sess->sess_buf, 42);

	if (sess->sess_tid)
		pthread_cancel(sess->sess_tid);
	free(sess);
}

static void *
thrSession(struct tagSession *sess)
{
	FTRACE(2);

	TAILQ_REMOVE(&Sessions, sess, sess_node);
	pthread_exit(NULL);
	return NULL;
}

static void *
startSession(sched_task_t *task)
{
	u_char basebuf[USHRT_MAX];
	mqtt_msg_t buf = { basebuf, sizeof basebuf };
	mqtthdr_connflgs_t flg;
	mqtthdr_connack_t cack;
	struct tagSession *sess = NULL;

	FTRACE(4);

	sess = initSession(TASK_FD(task), TASK_ARG(task));
	if (!sess) {
		if (TASK_ARG(task))
			free(TASK_ARG(task));
		close(TASK_FD(task));
		return NULL;
	}

	if (recv(sess->sess_sock, buf.msg_base, buf.msg_len, 0) == -1) {
		VERB(3) syslog(LOG_ERR, "Error:: recv(%d) #%d - %s", sess->sess_sock, errno, strerror(errno));
		goto end;
	}
	cack = mqtt_readCONNECT(&buf, &sess->sess_ka, sess->sess_cid, sizeof sess->sess_cid, 
			sess->sess_user, sizeof sess->sess_user, sess->sess_pass, sizeof sess->sess_pass, 
			&sess->sess_will.topic, &sess->sess_will.msg);
	flg.flags = cack.reserved;
	if (flg.reserved) {
		VERB(3) syslog(LOG_ERR, "Error:: in MQTT protocol #%d - %s", mqtt_GetErrno(), mqtt_GetError());
		goto end;
	} else {
		sess->sess_clean = flg.clean_sess;
		sess->sess_will.qos = flg.will_qos;
		sess->sess_will.retain = flg.will_retain;
		sess->sess_will.flag = flg.will_flg;
	}

	/* check online table for user */
	if (call.LoginACC(&cfg, acc, sess->sess_user, sess->sess_pass)) {
		VERB(1) syslog(LOG_WARNING, "Login:: DENIED for username %s and password %s", 
				sess->sess_user, sess->sess_pass);
		goto end;
	} else
		VERB(1) syslog(LOG_WARNING, "Login:: ALLOWED for username %s ...", sess->sess_user);

	/* Start session thread OK ... */
	TAILQ_INSERT_TAIL(&Sessions, sess, sess_node);
	pthread_create(&sess->sess_tid, NULL, (void*(*)(void*)) thrSession, sess);
	pthread_detach(sess->sess_tid);
	VERB(1) syslog(LOG_DEBUG, "ConnID=%s(%s) for %s login OK!", 
			sess->sess_cid, sess->sess_user, sess->sess_addr);
	return NULL;
end:	/* close client connection */
	VERB(1) syslog(LOG_DEBUG, "Close client %s with socket=%d", 
			(char*) TASK_ARG(task), (int) TASK_FD(task));
	finiSession(sess);
	return NULL;
}

/* ----------------------------------------------------------------------- */

static void *
thrSched(void *arg __unused)
{
	FTRACE(1);

	schedRun(root, (intptr_t*) &Kill);
	pthread_exit(NULL);
}

int
Run(int sock)
{
	io_sockaddr_t sa;
	socklen_t sslen = sizeof sa.ss;
	int cli;
	char *str = NULL, szAddr[STRSIZ] = { 0 };
	pthread_t tid;

	FTRACE(1);

	if (pthread_create(&tid, NULL, thrSched, NULL)) {
		syslog(LOG_ERR, "Error:: thread scheduler #%d - %s", errno, strerror(errno));
		return -1;
	} else
		pthread_detach(tid);
	VERB(2) syslog(LOG_DEBUG, "Run scheduler management thread");

	if (listen(sock, SOMAXCONN) == -1) {
		syslog(LOG_ERR, "Error:: listen(%d) #%d - %s\n", sock, errno, strerror(errno));
		pthread_cancel(tid);
		return -1;
	}

	while (!Kill) {
		if ((cli = accept(sock, &sa.sa, &sslen)) == -1) {
			syslog(LOG_ERR, "Error:: accept() #%d - %s", errno, strerror(errno));
			continue;
		} else
			VERB(1) {
				switch (sa.sa.sa_family) {
					case AF_INET:
						inet_ntop(AF_INET, &sa.sin.sin_addr, szAddr, sslen);
						snprintf(szAddr, sizeof szAddr, "%s:%d", 
								szAddr, ntohs(sa.sin.sin_port));
						break;
					case AF_INET6:
						inet_ntop(AF_INET6, &sa.sin6.sin6_addr, szAddr, sslen);
						snprintf(szAddr, sizeof szAddr, "%s:%d", 
								szAddr, ntohs(sa.sin6.sin6_port));
						break;
					case AF_LOCAL:
						strlcpy(szAddr, sa.sun.sun_path, sizeof szAddr);
						break;
					default:
						close(cli);
						syslog(LOG_ERR, "Error:: unsupported address type %d", 
								sa.sa.sa_family);
						continue;
				}
				str = strdup(szAddr);
				syslog(LOG_DEBUG, "Connected client with socket=%d from %s", cli, str);
			}

		if (!schedRead(root, startSession, str, cli)) {
			close(cli);
			VERB(1) syslog(LOG_DEBUG, "Terminated client with socket=%d", cli);
			if (str)
				free(str);
		}
	}

	return 0;
}