/* Copyright (c) 2012-2013 Yoran Heling

  Permission is hereby granted, free of charge, to any person obtaining
  a copy of this software and associated documentation files (the
  "Software"), to deal in the Software without restriction, including
  without limitation the rights to use, copy, modify, merge, publish,
  distribute, sublicense, and/or sell copies of the Software, and to
  permit persons to whom the Software is furnished to do so, subject to
  the following conditions:

  The above copyright notice and this permission notice shall be included
  in all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#include <global.h>
#include <hub/local.h>
#include <tiger.h>


__KHASH_IMPL(adcsids, static kh_inline, adc_sid_t, int64_t, 1, kh_int_hash_func, kh_int_hash_equal);

static int64_t hub_adc_sid_get(hub_t *h, adc_sid_t sid) {
	khiter_t k = kh_get(adcsids, h->a.sids, sid);
	return k == kh_end(h->a.sids) ? -1 : kh_value(h->a.sids, k);
}

static void hub_adc_sid_set(hub_t *h, adc_sid_t sid, int64_t uid) {
	int r;
	khiter_t k = kh_put(adcsids, h->a.sids, sid, &r);
	kh_value(h->a.sids, k) = uid;
}

static void hub_adc_sid_del(hub_t *h, adc_sid_t sid) {
	khiter_t k = kh_get(adcsids, h->a.sids, sid);
	if(k != kh_end(h->a.sids))
		kh_del(adcsids, h->a.sids, k);
}



/* Finalize, send and free an ADC message */
#define cmd_flush(h, msg) do {\
		adc_final(msg);\
		ydebug("%d: Sending message: %.*s", (h)->id, (int)(msg)->l-1, (msg)->s);\
		nets_write((h)->c.n, (msg)->s, (msg)->l, NULL);\
	} while(0)


#define cmd_error(h, cmd, len, msg) do {\
		yerror("%d: %s: %.*s", (h)->id, msg, (len)-1, cmd);\
		hub_hub_seterror(h, HUBCD_RECONNECT, "Protocol", msg, NULL);\
	} while(0)

#define cmd_warn(h, cmd, len, msg) ywarn("%d: %s: %.*s", (h)->id, msg, (int)(len)-1, cmd)


/* Fill out a hub_adc_myinf_t struct with current info */
static void hub_adc_myinf_create(hub_t *h, hub_adc_myinf_t *n) {
	n->NI = strdup(hub_hub_mynick(h));
	n->DE = strdup(hub_hub_mydescription(h));
	n->EM = strdup(hub_hub_myemail(h));
	n->US = hub_hub_myconnection(h);
	n->HN = hub_manager_hnorm();
	n->HR = hub_manager_hreg();
	n->HO = hub_manager_hop();
}


/* Free memory associated with a hub_adc_myinf_t struct */
static void hub_adc_myinf_free(hub_adc_myinf_t *n) {
	free(n->NI);
	free(n->DE);
	free(n->EM);
}


static void hub_adc_sendinf(hub_t *h) {
	kstring_t msg = {};
	hub_adc_myinf_t n, *o = &h->a.lastinf;
	bool f = h->a.state == ADC_IDENTIFY;

	hub_adc_myinf_create(h, &n);
	adc_create(&msg, 'B', ADC_CMD_INF, h->a.mysid, 0);
	size_t empty_len = msg.l;

	if(f) {
		adc_appendf(&msg, "PD%s", app_tiger_pid());
		adc_appendf(&msg, "ID%s", app_tiger_cid());
		adc_appendf(&msg, "VE%s %s", PACKAGE_NAME, app_version_short());
		adc_append(&msg, "SL1");
	}
	if(f || strcmp(n.NI, o->NI) != 0) adc_appendf(&msg, "NI%s", n.NI);
	if(f || strcmp(n.DE, o->DE) != 0) adc_appendf(&msg, "DE%s", n.DE);
	if(f || strcmp(n.EM, o->EM) != 0) adc_appendf(&msg, "EM%s", n.EM);
	if(f || n.US != o->US) adc_appendf(&msg, "US%u", n.US);
	if(f || n.HN != o->HN) adc_appendf(&msg, "HN%"PRIu16, n.HN);
	if(f || n.HR != o->HR) adc_appendf(&msg, "HR%"PRIu16, n.HR);
	if(f || n.HO != o->HO) adc_appendf(&msg, "HO%"PRIu16, n.HO);

	if(h->a.havelastinf)
		hub_adc_myinf_free(o);
	else
		h->a.havelastinf = true;
	h->a.lastinf = n;

	/* Don't send an INF if nothing has changed */
	if(empty_len == msg.l)
		free(msg.s);
	else
		cmd_flush(h, &msg);
}


static void hub_adc_inf_hub(hub_t *h, const char *cmd, int len) {
	char *p, *ni = NULL, *de = NULL, *ve = NULL, *ap = NULL;

	/* Some hubs (PyAdc) send multiple NIs, just use the last one. */
	for(p=adc_param_start(cmd); p; p=adc_param_next(p)) {
		switch(adc_param_name(p)) {
		case ADC_PARAM('N','I'): ni = p; break;
		case ADC_PARAM('D','E'): de = p; break;
		case ADC_PARAM('V','E'): ve = p; break;
		case ADC_PARAM('A','P'): ap = p; break;
		}
	}

	/* Not all hubs send a NI but do include a DE, use the DE as name in that
	 * case. */
	if(!ni && !*hub_hub_name(h) && de) {
		ni = de;
		de = NULL;
	}

	if(ni) {
		p = adc_param_namevalue(ni);
		ydebug("%d: Setting hub name to: %s", h->id, p);
		hub_hub_setname(h, p);
		free(p);
	}
	if(de) {
		p = adc_param_namevalue(de);
		ydebug("%d: Setting hub description to: %s", h->id, p);
		hub_hub_setdescription(h, p);
		free(p);
	}

	if(ve) {
		/* Combine AP and VE. Luckily, the only hub that supports AP (ADCH++)
		 * doesn't include its AP in the VE, as some clients do with their INF.
		 */
		kstring_t buf = {};
		if(ap) {
			adc_unescape_kstr(&buf, ap+2);
			kputc(' ', &buf);
		}
		adc_unescape_kstr(&buf, ve+2);
		hub_hub_setversion(h, buf.s);
		free(buf.s);
	}
}


static void hub_adc_inf_user_client(hub_user_update_t *d, const char *ve, const char *ap) {
	/* VE and AP need some special care. There are currently three forms used
	 * in the wild:
	 *   1. VE<app>\s<version>            (non-AP aware clients)
	 *   2. VE<version> AP<app>           (clients that follow the AP spec)
	 *   3. VE<app>\s<version> AP<app>    (*cough* stupid clients)          */
	kstring_t buf = {};
	size_t aplen = 0;
	if(ap) {
		adc_unescape_kstr(&buf, ap+2);
		if((aplen = buf.l) > 0)
			kputc(' ', &buf);
	}
	adc_unescape_kstr(&buf, ve+2);
	if(aplen > 0 && strncmp(buf.s, buf.s+aplen+1, aplen) == 0) /* <app> <app> <version> */
		memmove(buf.s, buf.s+aplen+1, buf.l-aplen);
	free(d->u->client);
	d->u->client = buf.s;
	hub_user_update_field(d, HUBU_CLIENT);
}


#define ERR(msg) do {\
		cmd_warn(d->h, cmd, len, msg);\
		return false;\
	} while(0)

#define UINT(param, max) do {\
		char *end = NULL;\
		uint64_t _v = strtoull(p+2, &end, 10);\
		if(!p[2] || !end || !adc_isparamend(*end))\
			ERR("Invalid integer value");\
		d->u->param = _v >= max ? max : _v;\
	} while(0)

static bool hub_adc_inf_user_param(hub_user_update_t *d, const char *cmd, int len, const char *p, const char **ve, const char **ap, bool *isreg) {
	switch(adc_param_name(p)) {
	case ADC_PARAM('N','I'): free(d->u->nick); d->u->nick = adc_param_namevalue(p); hub_user_update_field(d, HUBU_NICK       ); break;
	case ADC_PARAM('D','E'): free(d->u->desc); d->u->desc = adc_param_namevalue(p); hub_user_update_field(d, HUBU_DESCRIPTION); break;
	case ADC_PARAM('E','M'): free(d->u->mail); d->u->mail = adc_param_namevalue(p); hub_user_update_field(d, HUBU_MAIL       ); break;
	case ADC_PARAM('V','E'): *ve = p; break;
	case ADC_PARAM('A','P'): *ap = p; break;
	case ADC_PARAM('S','S'): UINT(sharesize,   UINT64_MAX); hub_user_update_field(d, HUBU_SHARESIZE  ); break;
	case ADC_PARAM('S','F'): UINT(sharedfiles, UINT32_MAX); hub_user_update_field(d, HUBU_SHAREDFILES); break;
	case ADC_PARAM('H','N'): UINT(hnorm,        UINT8_MAX); hub_user_update_field(d, HUBU_HUBS       ); break;
	case ADC_PARAM('H','R'): UINT(hreg,         UINT8_MAX); hub_user_update_field(d, HUBU_HUBS       ); break;
	case ADC_PARAM('H','O'): UINT(hop,          UINT8_MAX); hub_user_update_field(d, HUBU_HUBS       ); break;
	case ADC_PARAM('S','L'): UINT(hop,          UINT8_MAX); hub_user_update_field(d, HUBU_SLOTS      ); break;
	case ADC_PARAM('A','S'): UINT(as,          UINT32_MAX); hub_user_update_field(d, HUBU_AS         ); break;
	case ADC_PARAM('U','S'): UINT(conn,        UINT32_MAX); hub_user_update_field(d, HUBU_CONN       ); break;
	case ADC_PARAM('I','D'): {
		char *cid = adc_param_namevalue(p);
		if(!isbase32_24(cid)) {
			free(cid);
			ERR("Invalid CID");
		}
		if(d->u->id >= 0) {
			cmd_warn(d->h, cmd, len, "Ignoring repeated/duplicate ID");
			free(cid);
			break;
		}
		base32_decode(cid, d->u->a.cid, 24);
		hub_user_update_field(d, HUBU_CID);
		free(cid);
		break;
	}
	case ADC_PARAM('I','4'): {
		char *v = adc_param_namevalue(p);
		int r = inet_pton(AF_INET, v, &d->u->ip4);
		free(v);
		if(r != 1)
			ERR("Invalid IPv4 address");
		hub_user_update_field(d, HUBU_IP4);
		break;
	}
	case ADC_PARAM('I','6'): {
		char *v = adc_param_namevalue(p);
		int r = inet_pton(AF_INET6, v, &d->u->ip6);
		free(v);
		if(r != 1)
			ERR("Invalid IPv6 address");
		hub_user_update_field(d, HUBU_IP6);
		break;
	}
	case ADC_PARAM('C','T'): {
		char *end = NULL;\
		uint64_t _v = strtoull(p+2, &end, 10);\
		if(!p[2] || !end || !adc_isparamend(*end))\
			ERR("Invalid integer value");\
		*isreg = _v & (2|4|8|16);
		bool op = _v & (4|8|16);
		if(op != d->u->op)
			hub_user_update_field(d, HUBU_FLAGS);
		d->u->op = op;
		break;
	}
	case ADC_PARAM('S','U'): {
		char *v = adc_param_namevalue(p);
		bool active = strstr(v, "TCP4") || strstr(v, "TCP6");
		bool tls = strstr(v, "ADC0") || strstr(v, "ADCS");
		if(active != d->u->active || tls != d->u->tls)
			hub_user_update_field(d, HUBU_FLAGS);
		d->u->active = active;
		d->u->tls = tls;
		free(v);
		break;
	}
	case ADC_PARAM('A','W'): {
		bool aw = !(adc_isparamend(p[2]) || p[2] == '0');
		if(aw != d->u->away)
			hub_user_update_field(d, HUBU_FLAGS);
		d->u->away = aw;
		break;
	}
	/* TODO: U4 */
	}
	return true;
}


static bool hub_adc_inf_user_update(hub_user_update_t *d, const char *cmd, int len, bool *isreg, bool newuser) {
	const char *p, *ve = NULL, *ap = NULL;

	for(p=adc_param_start(cmd); p; p=adc_param_next(p))
		if(!hub_adc_inf_user_param(d, cmd, len, p, &ve, &ap, isreg))
			return false;

	if(ve)
		hub_adc_inf_user_client(d, ve, ap);

	if(!d->u->nick || !*d->u->nick)
		ERR("No or empty nick");

	if(newuser) {
		char emptycid[sizeof(d->u->a.cid)] = {};
		if(memcmp(d->u->a.cid, emptycid, sizeof(d->u->a.cid)) == 0)
			ERR("No CID in INF for new user");
		d->u->id = d->u->a.sid == d->h->a.mysid ? 0 : hub_users_genid(d->h, d->u->a.cid, sizeof(d->u->a.cid));
	}
	return true;
}

#undef UINT
#undef ERR


static void hub_adc_inf_user(hub_t *h, const char *cmd, int len, adc_sid_t sid) {
	bool isreg = false;
	hub_user_update_t d[1];

	int64_t uid = hub_adc_sid_get(h, sid);
	hub_user_t *u = uid >= 0 ? hub_users_get(h, uid) : hub_user_new(true);
	assert(u != NULL);

	hub_user_update_init(h, d, u);
	d->u->a.sid = sid;

	bool okay = hub_adc_inf_user_update(d, cmd, len, &isreg, uid < 0);
	if(uid < 0) {
		if(okay)
			hub_adc_sid_set(h, sid, u->id);
		else
			hub_user_unref(h, u);
	}
	if(okay)
		hub_user_update_done(d, uid < 0);

	/* Our own SID comes last, at which point we're in NORMAL */
	if(sid == h->a.mysid && h->a.state != ADC_NORMAL) {
		hub_hub_loggedin(h);
		hub_manager_settype(h, h->a.state == ADC_VERIFY ? HUBM_HREG : HUBM_HNORM);
		h->a.state = ADC_NORMAL;
		hub_users_listcomplete(h);
		if(isreg)
			hub_manager_settype(h, u->op ? HUBM_HOP : HUBM_HREG);
	}
}


static void hub_adc_inf(hub_t *h, const char *cmd, int len) {
	adc_sid_t src = adc_source(cmd);
	if(src == -1)
		hub_adc_inf_hub(h, cmd, len);
	else
		hub_adc_inf_user(h, cmd, len, src);
}


static void hub_adc_qui(hub_t *h, const char *cmd, int len) {
	const char *p = adc_param_start(cmd);
	adc_sid_t sid = p ? adc_str2sid(p) : -1;
	if(sid == -1) {
		cmd_warn(h, cmd, len, "Invalid SID argument");
		return;
	}

	adc_sid_t initiator = -1;
	char *message = NULL, *redir = NULL;
	while((p = adc_param_next(p))) {
		switch(adc_param_name(p)) {
		case ADC_PARAM('I','D'): initiator = adc_str2sid(p); break;
		case ADC_PARAM('M','S'): free(message); message = adc_param_namevalue(p); break;
		case ADC_PARAM('R','D'): free(redir); redir = adc_param_namevalue(p); break;
		}
	}

	if(sid != h->a.mysid) {
		int64_t id = hub_adc_sid_get(h, sid);
		if(id == -1)
			cmd_warn(h, cmd, len, "QUI for user not on this hub");
		else {
			int64_t initid = initiator == -1 ? -2 : hub_adc_sid_get(h, initiator);
			hub_user_left(h, id, initid, message ? message : "");
		}
	} else {
		/* We've been disconnected. */
		hub_hub_seterror(h, redir ? 0 : HUBCD_RECONNECT, redir ? "Redirect" : "Disconnect", message ? message : "Disconnected from hub", redir);
	}
	hub_adc_sid_del(h, sid);
	free(message);
}


static void hub_adc_msg(hub_t *h, const char *cmd, int len) {
	const char *p = adc_param_start(cmd);
	if(!p) {
		cmd_warn(h, cmd, len, "MSG without message parameter");
		return;
	}

	adc_sid_t src = adc_source(cmd);
	int64_t user = -1;
	if(src >= 0 && (user = hub_adc_sid_get(h, src)) == -1) {
		cmd_warn(h, cmd, len, "MSG from an unknown SID");
		return;
	}

	char *msg = adc_param_posvalue(p);
	bool me = false;
	adc_sid_t pmsid = -1;
	for(; p; p=adc_param_next(p)) {
		switch(adc_param_name(p)) {
		case ADC_PARAM('M','E'): me = p[2] == '1' && adc_isparamend(p[3]); break;
		case ADC_PARAM('P','M'): pmsid = adc_str2sid(p+2); pmsid = pmsid == -1 ? -2 : pmsid; break;
		}
	}

	int64_t group = -1;
	if(pmsid == -2 || (pmsid >= 0 && (group = hub_adc_sid_get(h, pmsid)) == -1)) {
		cmd_warn(h, cmd, len, "MSG with unknown SID in PM param");
		free(msg);
		return;
	}

	/* Don't consider a direct message as a mainchat one, even if there is no
	 * PM param. */
	adc_sid_t dest = adc_dest(cmd);
	if(group == -1 && dest != -1)
		group = user;

	/* If we sent a PM and this message is its echo, make sure to set the group
	 * to whatever SID we sent it to. */
	if(group == 0 && dest != -1 && (group = hub_adc_sid_get(h, dest)) == -1) {
		cmd_warn(h, cmd, len, "MSG with unknown SID as target");
		free(msg);
		return;
	}

	hub_chat_message(h, group, user, msg, me);
	free(msg);
}


static void hub_adc_sta(hub_t *h, const char *cmd, int len) {
	const char *code = adc_param_start(cmd);
	const char *msgpar = code ? adc_param_next(code) : NULL;
	if(!code || code[0] < '0' || code[0] > '4' || code[1] < '0' || code[1] > '9' || code[2] < '0' || code[2] > '9' || !adc_isparamend(code[3]) || !msgpar) {
		cmd_warn(h, cmd, len, "Invalid positional parameter");
		return;
	}

	adc_sid_t src = adc_source(cmd);
	char *msg = adc_param_posvalue(msgpar);

	/* Kick/ban */
	if(src == -1 && code[0] == '2' && code[1] == '3')
		/* Don't disconnect. It's the responsibility of the hub to disconnect
		 * us after a fatal STA message. In particular, ADCH++ usually first
		 * sends a fatal STA and then a QUI with potentially more information.
		 * Disconnecting here would miss that QUI. */
		hub_hub_seterror(h, HUBCD_NO, "Disconnect", msg, NULL);

	/* Nick invalid / taken */
	else if(src == -1 && code[1] == '2' && (code[2] == '1' || code[2] == '2'))
		hub_hub_seterror(h, HUBCD_RECONNECT, "InvalidNick", msg, NULL);

	/* Invalid password */
	else if(src == -1 && code[1] == '2' && code[2] == '3')
		hub_hub_seterror(h, 0, "InvalidPassword", msg, NULL);

	/* Full */
	else if(src == -1 && code[1] == '1' && code[2] == '1')
		hub_hub_seterror(h, HUBCD_RECONNECT, "Full", msg, NULL);

	/* Any other fatal STA from the hub */
	else if(src == -1 && *code == '2')
		hub_hub_seterror(h, HUBCD_NO, "Protocol", msg, NULL);

	/* Anything else is just logged and otherwise ignored at the moment */
	else if(*code == '0')
		yinfo("%d: Status message: %.*s", h->id, (int)len-1, cmd);
	else
		cmd_warn(h, cmd, len, "Error message");

	free(msg);
}


static void hub_adc_sup(hub_t *h, const char *cmd, int len) {
	bool hasbase = false, hastigr = false;
	const char *p;

	for(p=adc_param_start(cmd); p; p=adc_param_next(p)) {
		if(strncmp(p, "ADBASE", 6) == 0)
			hasbase = true;
		else if(strncmp(p, "ADTIGR", 6) == 0)
			hastigr = true;
		else if(strncmp(p, "RMBASE", 6) == 0 || strncmp(p, "RMTIGR", 6) == 0) {
			cmd_error(h, cmd, len, "Attempt to remove support for BASE or TIGR");
			return;
		}
	}

	if(h->a.state == ADC_PROTOCOL && (!hasbase || !hastigr)) {
		cmd_error(h, cmd, len, "Hub does not support BASE and/or TIGR");
		return;
	}
}


static void hub_adc_sid(hub_t *h, const char *cmd, int len) {
	char *arg = adc_param_start(cmd);
	if(!arg || (h->a.mysid = adc_str2sid(arg)) < 0) {
		cmd_error(h, cmd, len, "Invalid SID");
		return;
	}
	h->a.state = ADC_IDENTIFY;
	hub_adc_sendinf(h);
}


static void hub_adc_gpa(hub_t *h, const char *cmd, int len) {
	const char *passwd = hub_hub_mypassword(h);
	char *arg = adc_param_start(cmd);
	if(!arg) {
		cmd_warn(h, cmd, len, "Data parameter missing");
		return;
	}
	if(!passwd || !*passwd) {
		hub_hub_seterror(h, 0, "NeedPassword", "Hub requires a password", NULL);
		return;
	}
	char *data = adc_param_posvalue(arg);
	int binlength = base32_binlength(strlen(data));
	int paslength = strlen(passwd);
	/* The ADC 1.0.2 spec says that the length of the data should be at least
	 * 24 bytes. Some hubs don't follow this, unfortunately. There is strictly
	 * no maximum, but we don't want a stack overflow. */
	if(!isbase32(data) || binlength < 6 || binlength > 256) {
		cmd_error(h, cmd, len, "Hub did not provide valid or enough random salt");
		free(data);
		return;
	}
	char bindata[paslength + binlength];
	strcpy(bindata, passwd);
	base32_decode(data, bindata+paslength, binlength);
	free(data);

	t_res res;
	tiger(bindata, paslength + binlength, res);
	t_to_from_littleendian(res);
	char bres[40];
	base32_encode((char *)res, bres, 24);

	kstring_t msg = {};
	adc_create(&msg, 'H', ADC_CMD_PAS, 0, 0);
	adc_append(&msg, bres);
	cmd_flush(h, &msg);
	h->a.state = ADC_VERIFY;
}


static void hub_adc_zon(hub_t *h, const char *cmd, int len) {
	h->a.zlibenable = true;
}


static void hub_adc_zof(hub_t *h, const char *cmd, int len) {
	/* No need to do anything with it. The hub should close the zlib stream
	 * after this command, and netstream.c should detect that. */
}


static void hub_adc_handle(hub_t *h, const char *cmd, int len) {
	static const struct {
		adc_cmd_t cmd;
		adc_state_t states;  /* 0 = all */
		const char types[8]; /* empty = all */
		void (*func)(hub_t *, const char *, int);
	} cmds[] = {
		{ ADC_CMD_INF, ADC_IDENTIFY|ADC_VERIFY|ADC_NORMAL, "",  hub_adc_inf },
		{ ADC_CMD_QUI, ADC_IDENTIFY|ADC_VERIFY|ADC_NORMAL, "I", hub_adc_qui },
		/* MSG Should be NORMAL-only, but ADCH++ doesn't know that. */
		{ ADC_CMD_MSG, ADC_IDENTIFY|ADC_VERIFY|ADC_NORMAL, "",  hub_adc_msg },
		{ ADC_CMD_STA, 0,                                  "",  hub_adc_sta },
		{ ADC_CMD_SUP, 0,                                  "I", hub_adc_sup },
		{ ADC_CMD_SID, ADC_PROTOCOL,                       "I", hub_adc_sid },
		{ ADC_CMD_GPA, ADC_IDENTIFY,                       "I", hub_adc_gpa },
		{ ADC_CMD_ZON, 0,                                  "I", hub_adc_zon },
		{ ADC_CMD_ZOF, 0,                                  "I", hub_adc_zof }
	};

	adc_cmd_t c = adc_command(cmd);
	if(!c) /* Empty \n */
		return;

	int i;
	for(i=0; i<(int)(sizeof(cmds)/sizeof(*cmds)); i++)
		if(c == cmds[i].cmd)
			break;

	if(i == sizeof(cmds)/sizeof(*cmds)) {
		yinfo("%d: Unhandled command: %.*s", h->id, len-1, cmd);
		return;
	}

	if(cmds[i].states && !(h->a.state & cmds[i].states)) {
		cmd_warn(h, cmd, len, "Command received in wrong state");
		return;
	}

	const char *t = cmds[i].types;
	if(*t) {
		while(*t && *t != adc_type(cmd))
			t++;
		if(!*t) {
			/* This is as much an "error" as an unhandled command is, so just warn. */
			cmd_warn(h, cmd, len, "Ignoring command with wrong type");
			return;
		}
	}

	cmds[i].func(h, cmd, len);
}


static void hub_adc_sendkeepalive(hub_t *h) {
	nets_write(h->c.n, strdup("\n"), 1, NULL);
}


static int hub_adc_read(hub_t *h, const char *buf, int oldlen, int len) {
	int con = 0;
	char *next;
	/* Only check the newly added data. */
	if((next = memchr(buf+oldlen, '\n', len-oldlen)) == NULL)
		return 0;

	do {
		int l = adc_validate(buf, len-con);
		if(l != next-buf+1)
			cmd_warn(h, buf, next-buf+1, "Invalid ADC message");
		else {
			ydebug("%d: Received message: %.*s", h->id, l-1, buf);
			hub_adc_handle(h, buf, l);
		}
		con += next-buf+1;
		buf = next+1;
	} while(!h->a.zlibenable && hub_conn_state(h) == HUBC_CONN && (next = memchr(buf, '\n', len-con)) != NULL);

	/* We've received a ZON, make sure to unread all buffered data */
	if(h->a.zlibenable && hub_conn_state(h) == HUBC_CONN) {
		ydebug("%d: Enabling zlib, unreading %d bytes", h->id, len-con);
		nets_unread(h->c.n, buf, len-con);
		nets_zlibr_enable(h->c.n, NULL);
		con = len;
	}
	h->a.zlibenable = false;

	return con;
}


static bool hub_adc_chat(hub_t *h, hub_user_t *u, const char *message, bool me) {
	if(hub_conn_state(h) != HUBC_CONN || h->a.state != ADC_NORMAL)
		return false;
	kstring_t msg = {};
	adc_create(&msg, u ? 'E' : 'B', ADC_CMD_MSG, h->a.mysid, u ? u->a.sid : 0);
	adc_append(&msg, message);
	if(me)
		adc_append(&msg, "ME1");
	if(u) {
		char sid[5] = {};
		adc_sid2str(h->a.mysid, sid);
		adc_appendf(&msg, "PM%s", sid);
	}
	cmd_flush(h, &msg);
	return true;
}


static void hub_adc_connected(hub_t *h) {
	kstring_t msg = {};
	h->a.state = ADC_PROTOCOL;
	h->a.havelastinf = false;
	h->a.sids = kh_init(adcsids);

	adc_create(&msg, 'H', ADC_CMD_SUP, 0, 0);
	adc_append(&msg, "ADBASE");
	adc_append(&msg, "ADTIGR");
	adc_append(&msg, "ADZLIF");
	cmd_flush(h, &msg);
}


static void hub_adc_disconnected(hub_t *h) {
	if(h->a.havelastinf)
		hub_adc_myinf_free(&h->a.lastinf);
	kh_destroy(adcsids, h->a.sids);
	hub_manager_settype(h, HUBM_HNONE);
}


const hub_proto_t hub_adc = {
	hub_adc_connected,
	hub_adc_disconnected,
	hub_adc_sendinf,
	hub_adc_sendkeepalive,
	hub_adc_chat,
	hub_adc_read
};

/* vim: set noet sw=4 ts=4: */