/*
 * Purple's oscar protocol plugin
 * This file is the legal property of its developers.
 * Please see the AUTHORS file distributed alongside this file.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
*/

/*
 * Family 0x0013 - Server-Side/Stored Information.
 *
 * Relatively new facility that allows certain types of information, such as
 * a user's buddy list, permit/deny list, and permit/deny preferences, to be
 * stored on the server, so that they can be accessed from any client.
 *
 * We keep 2 copies of SSI data:
 * 1) An exact copy of what is stored on the AIM servers.
 * 2) A local copy that we make changes to, and then send diffs
 *    between this and the exact copy to keep them in sync.
 *
 * All the "aim_ssi_itemlist_bleh" functions near the top just modify the list
 * that is given to them (i.e. they don't send SNACs).
 *
 * The SNAC sending and receiving functions are lower down in the file, and
 * they're simpler.  They are in the order of the subtypes they deal with,
 * starting with the request rights function (subtype 0x0002), then parse
 * rights (subtype 0x0003), then--well, you get the idea.
 *
 * This is entirely too complicated.
 * You don't know the half of it.
 *
 */

#include "oscar.h"

static int aim_ssi_addmoddel(OscarData *od);

/**
 * Locally rebuild the 0x00c8 TLV in the additional data of the given group.
 *
 * @param list A pointer to a pointer to the current list of items.
 * @param name A null terminated string containing the group name, or NULL
 *        if you want to modify the master group.
 * @return Return a pointer to the modified item.
 */
static void
aim_ssi_itemlist_rebuildgroup(struct aim_ssi_item *list, const char *name)
{
	int newlen;
	struct aim_ssi_item *cur, *group;

	/* Find the group */
	if (!(group = aim_ssi_itemlist_finditem(list, name, NULL, AIM_SSI_TYPE_GROUP)))
		return;

	/* Find the length for the new additional data */
	newlen = 0;
	if (group->gid == 0x0000) {
		for (cur=list; cur; cur=cur->next)
			if ((cur->type == AIM_SSI_TYPE_GROUP) && (cur->gid != 0x0000))
				newlen += 2;
	} else {
		for (cur=list; cur; cur=cur->next)
			if ((cur->gid == group->gid) && (cur->type == AIM_SSI_TYPE_BUDDY))
				newlen += 2;
	}

	/* Build the new TLV list */
	if (newlen > 0) {
		guint8 *newdata;

		newdata = (guint8 *)g_malloc((newlen)*sizeof(guint8));
		newlen = 0;
		if (group->gid == 0x0000) {
			for (cur=list; cur; cur=cur->next)
				if ((cur->type == AIM_SSI_TYPE_GROUP) && (cur->gid != 0x0000))
						newlen += aimutil_put16(newdata+newlen, cur->gid);
		} else {
			for (cur=list; cur; cur=cur->next)
				if ((cur->gid == group->gid) && (cur->type == AIM_SSI_TYPE_BUDDY))
						newlen += aimutil_put16(newdata+newlen, cur->bid);
		}
		aim_tlvlist_replace_raw(&group->data, 0x00c8, newlen, newdata);

		g_free(newdata);
	}
}

/**
 * Locally add a new item to the given item list.
 *
 * @param list A pointer to a pointer to the current list of items.
 * @param name A null terminated string of the name of the new item, or NULL if the
 *        item should have no name.
 * @param gid The group ID# you want the new item to have, or 0xFFFF if we should pick something.
 * @param bid The buddy ID# you want the new item to have, or 0xFFFF if we should pick something.
 * @param type The type of the item, 0x0000 for a contact, 0x0001 for a group, etc.
 * @param data The additional data for the new item.
 * @return A pointer to the newly created item.
 */
static struct aim_ssi_item *aim_ssi_itemlist_add(struct aim_ssi_item **list, const char *name, guint16 gid, guint16 bid, guint16 type, GSList *data)
{
	gboolean exists;
	struct aim_ssi_item *cur, *new;

	new = (struct aim_ssi_item *)g_malloc(sizeof(struct aim_ssi_item));

	/* Set the name */
	if (name) {
		new->name = (char *)g_malloc((strlen(name)+1)*sizeof(char));
		strcpy(new->name, name);
	} else
		new->name = NULL;

	/* Set the group ID# and buddy ID# */
	new->gid = gid;
	new->bid = bid;
	if (type == AIM_SSI_TYPE_GROUP) {
		if ((new->gid == 0xFFFF) && name) {
			do {
				new->gid += 0x0001;
				exists = FALSE;
				for (cur = *list; cur != NULL; cur = cur->next)
					if ((cur->type == AIM_SSI_TYPE_GROUP) && (cur->gid == new->gid)) {
						exists = TRUE;
						break;
					}
			} while (exists);
		}
	} else if (type == AIM_SSI_TYPE_ICONINFO) {
		if (new->bid == 0xFFFF) {
			do {
				new->bid += 0x0001;
				exists = FALSE;
				for (cur = *list; cur != NULL; cur = cur->next)
					if ((cur->bid >= new->bid) || (cur->gid >= new->bid)) {
						exists = TRUE;
						break;
					}
			} while (exists);
		}
	} else {
		if (new->bid == 0xFFFF) {
			do {
				new->bid += 0x0001;
				exists = FALSE;
				for (cur = *list; cur != NULL; cur = cur->next)
					if ((cur->bid == new->bid) && (cur->gid == new->gid)) {
						exists = TRUE;
						break;
					}
			} while (exists);
		}
	}

	/* Set the type */
	new->type = type;

	/* Set the TLV list */
	new->data = aim_tlvlist_copy(data);

	/* Add the item to the list in the correct numerical position.  Fancy, eh? */
	if (*list) {
		if ((new->gid < (*list)->gid) || ((new->gid == (*list)->gid) && (new->bid < (*list)->bid))) {
			new->next = *list;
			*list = new;
		} else {
			struct aim_ssi_item *prev;
			for ((prev=*list, cur=(*list)->next); (cur && ((new->gid > cur->gid) || ((new->gid == cur->gid) && (new->bid > cur->bid)))); prev=cur, cur=cur->next);
			new->next = prev->next;
			prev->next = new;
		}
	} else {
		new->next = *list;
		*list = new;
	}

	return new;
}

/**
 * Locally delete an item from the given item list.
 *
 * @param list A pointer to a pointer to the current list of items.
 * @param del A pointer to the item you want to remove from the list.
 * @return Return 0 if no errors, otherwise return the error number.
 */
static int aim_ssi_itemlist_del(struct aim_ssi_item **list, struct aim_ssi_item *del)
{
	if (!(*list) || !del)
		return -EINVAL;

	/* Remove the item from the list */
	if (*list == del) {
		*list = (*list)->next;
	} else {
		struct aim_ssi_item *cur;
		for (cur=*list; (cur->next && (cur->next!=del)); cur=cur->next);
		if (cur->next)
			cur->next = del->next;
	}

	/* Free the removed item */
	g_free(del->name);
	aim_tlvlist_free(del->data);
	g_free(del);

	return 0;
}

/**
 * Compare two items to see if they have the same data.
 *
 * @param cur1 A pointer to a pointer to the first item.
 * @param cur2 A pointer to a pointer to the second item.
 * @return Return 0 if no differences, or a number if there are differences.
 */
static int aim_ssi_itemlist_cmp(struct aim_ssi_item *cur1, struct aim_ssi_item *cur2)
{
	if (!cur1 || !cur2)
		return 1;

	if (cur1->data && !cur2->data)
		return 2;

	if (!cur1->data && cur2->data)
		return 3;

	if ((cur1->data && cur2->data) && (aim_tlvlist_cmp(cur1->data, cur2->data)))
		return 4;

	if (cur1->name && !cur2->name)
		return 5;

	if (!cur1->name && cur2->name)
		return 6;

	if (cur1->name && cur2->name && aim_sncmp(cur1->name, cur2->name))
		return 7;

	if (cur1->gid != cur2->gid)
		return 8;

	if (cur1->bid != cur2->bid)
		return 9;

	if (cur1->type != cur2->type)
		return 10;

	return 0;
}

static gboolean aim_ssi_itemlist_valid(struct aim_ssi_item *list, struct aim_ssi_item *item)
{
	struct aim_ssi_item *cur;
	for (cur=list; cur; cur=cur->next)
		if (cur == item)
			return TRUE;
	return FALSE;
}

/**
 * Locally find an item given a group ID# and a buddy ID#.
 *
 * @param list A pointer to the current list of items.
 * @param gid The group ID# of the desired item.
 * @param bid The buddy ID# of the desired item.
 * @return Return a pointer to the item if found, else return NULL;
 */
struct aim_ssi_item *aim_ssi_itemlist_find(struct aim_ssi_item *list, guint16 gid, guint16 bid)
{
	struct aim_ssi_item *cur;
	for (cur=list; cur; cur=cur->next)
		if ((cur->gid == gid) && (cur->bid == bid))
			return cur;
	return NULL;
}

/**
 * Locally find an item given a group name, screen name, and type.  If group name
 * and screen name are null, then just return the first item of the given type.
 *
 * @param list A pointer to the current list of items.
 * @param gn The group name of the desired item.
 * @param bn The buddy name of the desired item.
 * @param type The type of the desired item.
 * @return Return a pointer to the item if found, else return NULL.
 */
struct aim_ssi_item *aim_ssi_itemlist_finditem(struct aim_ssi_item *list, const char *gn, const char *sn, guint16 type)
{
	struct aim_ssi_item *cur;
	if (!list)
		return NULL;

	if (gn && sn) { /* For finding buddies in groups */
		for (cur=list; cur; cur=cur->next)
			if ((cur->type == type) && (cur->name) && !(aim_sncmp(cur->name, sn))) {
				struct aim_ssi_item *curg;
				for (curg=list; curg; curg=curg->next)
					if ((curg->type == AIM_SSI_TYPE_GROUP) && (curg->gid == cur->gid) && (curg->name) && !(aim_sncmp(curg->name, gn)))
						return cur;
			}

	} else if (gn) { /* For finding groups */
		for (cur=list; cur; cur=cur->next) {
			if ((cur->type == type) && (cur->bid == 0x0000) && (cur->name) && !(aim_sncmp(cur->name, gn))) {
				return cur;
			}
		}

	} else if (sn) { /* For finding permits, denies, and ignores */
		for (cur=list; cur; cur=cur->next) {
			if ((cur->type == type) && (cur->name) && !(aim_sncmp(cur->name, sn))) {
				return cur;
			}
		}

	/* For stuff without names--permit deny setting, visibility mask, etc. */
	} else for (cur=list; cur; cur=cur->next) {
		if ((cur->type == type) && (!cur->name))
			return cur;
	}

	return NULL;
}

/**
 * Check if the given buddy exists in any group in the buddy list.
 *
 * @param list A pointer to the current list of items.
 * @param sn The group name of the desired item.
 * @return Return a pointer to the name of the item if found, else return NULL;
 */
struct aim_ssi_item *aim_ssi_itemlist_exists(struct aim_ssi_item *list, const char *sn)
{
	struct aim_ssi_item *cur;
	if (!list || !sn)
		return NULL;
	for (cur=list; cur; cur=cur->next)
		if ((cur->type == AIM_SSI_TYPE_BUDDY) && (cur->name) && (!aim_sncmp(cur->name, sn)))
			return cur;
	return NULL;
}

/**
 * Locally find the parent item of the given buddy name.
 *
 * @param list A pointer to the current list of items.
 * @param bn The buddy name of the desired item.
 * @return Return a pointer to the name of the item if found, else return NULL;
 */
char *aim_ssi_itemlist_findparentname(struct aim_ssi_item *list, const char *sn)
{
	struct aim_ssi_item *cur, *curg;
	if (!list || !sn)
		return NULL;
	if (!(cur = aim_ssi_itemlist_exists(list, sn)))
		return NULL;
	if (!(curg = aim_ssi_itemlist_find(list, cur->gid, 0x0000)))
		return NULL;
	return curg->name;
}

/**
 * Locally find the permit/deny setting item, and return the setting.
 *
 * @param list A pointer to the current list of items.
 * @return Return the current SSI permit deny setting, or 0 if no setting was found.
 */
int aim_ssi_getpermdeny(struct aim_ssi_item *list)
{
	struct aim_ssi_item *cur = aim_ssi_itemlist_finditem(list, NULL, NULL, AIM_SSI_TYPE_PDINFO);
	if (cur) {
		aim_tlv_t *tlv = aim_tlv_gettlv(cur->data, 0x00ca, 1);
		if (tlv && tlv->value)
			return aimutil_get8(tlv->value);
	}
	return 0;
}

/**
 * Locally find the presence flag item, and return the setting.  The returned setting is a
 * bitmask of the user flags that you are visible to.  See the AIM_FLAG_* #defines
 * in oscar.h
 *
 * @param list A pointer to the current list of items.
 * @return Return the current visibility mask.
 */
guint32 aim_ssi_getpresence(struct aim_ssi_item *list)
{
	struct aim_ssi_item *cur = aim_ssi_itemlist_finditem(list, NULL, NULL, AIM_SSI_TYPE_PRESENCEPREFS);
	if (cur) {
		aim_tlv_t *tlv = aim_tlv_gettlv(cur->data, 0x00c9, 1);
		if (tlv && tlv->length)
			return aimutil_get32(tlv->value);
	}
	return 0xFFFFFFFF;
}

/**
 * Locally find the alias of the given buddy.
 *
 * @param list A pointer to the current list of items.
 * @param gn The group of the buddy.
 * @param sn The name of the buddy.
 * @return A pointer to a NULL terminated string that is the buddy's
 *         alias, or NULL if the buddy has no alias.  You should free
 *         this returned value!
 */
char *aim_ssi_getalias(struct aim_ssi_item *list, const char *gn, const char *sn)
{
	struct aim_ssi_item *cur = aim_ssi_itemlist_finditem(list, gn, sn, AIM_SSI_TYPE_BUDDY);
	if (cur) {
		aim_tlv_t *tlv = aim_tlv_gettlv(cur->data, 0x0131, 1);
		if (tlv && tlv->length)
			return g_strndup((const gchar *)tlv->value, tlv->length);
	}
	return NULL;
}

/**
 * Locally find the comment of the given buddy.
 *
 * @param list A pointer to the current list of items.
 * @param gn The group of the buddy.
 * @param sn The name of the buddy.
 * @return A pointer to a NULL terminated string that is the buddy's
 *         comment, or NULL if the buddy has no comment.  You should free
 *         this returned value!
 */
char *aim_ssi_getcomment(struct aim_ssi_item *list, const char *gn, const char *sn)
{
	struct aim_ssi_item *cur = aim_ssi_itemlist_finditem(list, gn, sn, AIM_SSI_TYPE_BUDDY);
	if (cur) {
		aim_tlv_t *tlv = aim_tlv_gettlv(cur->data, 0x013c, 1);
		if (tlv && tlv->length) {
			return g_strndup((const gchar *)tlv->value, tlv->length);
		}
	}
	return NULL;
}

/**
 * Locally find if you are waiting for authorization for a buddy.
 *
 * @param list A pointer to the current list of items.
 * @param gn The group of the buddy.
 * @param sn The name of the buddy.
 * @return 1 if you are waiting for authorization; 0 if you are not
 */
gboolean aim_ssi_waitingforauth(struct aim_ssi_item *list, const char *gn, const char *sn)
{
	struct aim_ssi_item *cur = aim_ssi_itemlist_finditem(list, gn, sn, AIM_SSI_TYPE_BUDDY);
	if (cur) {
		if (aim_tlv_gettlv(cur->data, 0x0066, 1))
			return TRUE;
	}
	return FALSE;
}

/**
 * If there are changes, then create temporary items and
 * call addmoddel.
 *
 * @param od The oscar session.
 * @return Return 0 if no errors, otherwise return the error number.
 */
static int aim_ssi_sync(OscarData *od)
{
	struct aim_ssi_item *cur1, *cur2;
	struct aim_ssi_tmp *cur, *new;
	int n = 0;

	/*
	 * The variable "n" is used to limit the number of addmoddel's that
	 * are performed in a single SNAC.  It will hopefully keep the size
	 * of the SNAC below the maximum SNAC size.
	 */

	if (!od)
		return -EINVAL;

	/* If we're waiting for an ack, we shouldn't do anything else */
	if (od->ssi.waiting_for_ack)
		return 0;

	/*
	 * Compare the 2 lists and create an aim_ssi_tmp for each difference.
	 * We should only send either additions, modifications, or deletions
	 * before waiting for an acknowledgement.  So first do deletions, then
	 * additions, then modifications.  Also, both the official and the local
	 * list should be in ascending numerical order for the group ID#s and the
	 * buddy ID#s, which makes things more efficient.  I think.
	 */

	/* Deletions */
	if (!od->ssi.pending) {
		for (cur1=od->ssi.official; cur1 && (n < 15); cur1=cur1->next) {
			if (!aim_ssi_itemlist_find(od->ssi.local, cur1->gid, cur1->bid)) {
				n++;
				new = (struct aim_ssi_tmp *)g_malloc(sizeof(struct aim_ssi_tmp));
				new->action = SNAC_SUBTYPE_FEEDBAG_DEL;
				new->ack = 0xffff;
				new->name = NULL;
				new->item = cur1;
				new->next = NULL;
				if (od->ssi.pending) {
					for (cur=od->ssi.pending; cur->next; cur=cur->next);
					cur->next = new;
				} else
					od->ssi.pending = new;
			}
		}
	}

	/* Additions */
	if (!od->ssi.pending) {
		for (cur1=od->ssi.local; cur1 && (n < 15); cur1=cur1->next) {
			if (!aim_ssi_itemlist_find(od->ssi.official, cur1->gid, cur1->bid)) {
				n++;
				new = (struct aim_ssi_tmp *)g_malloc(sizeof(struct aim_ssi_tmp));
				new->action = SNAC_SUBTYPE_FEEDBAG_ADD;
				new->ack = 0xffff;
				new->name = NULL;
				new->item = cur1;
				new->next = NULL;
				if (od->ssi.pending) {
					for (cur=od->ssi.pending; cur->next; cur=cur->next);
					cur->next = new;
				} else
					od->ssi.pending = new;
			}
		}
	}

	/* Modifications */
	if (!od->ssi.pending) {
		for (cur1=od->ssi.local; cur1 && (n < 15); cur1=cur1->next) {
			cur2 = aim_ssi_itemlist_find(od->ssi.official, cur1->gid, cur1->bid);
			if (cur2 && (aim_ssi_itemlist_cmp(cur1, cur2))) {
				n++;
				new = (struct aim_ssi_tmp *)g_malloc(sizeof(struct aim_ssi_tmp));
				new->action = SNAC_SUBTYPE_FEEDBAG_MOD;
				new->ack = 0xffff;
				new->name = NULL;
				new->item = cur1;
				new->next = NULL;
				if (od->ssi.pending) {
					for (cur=od->ssi.pending; cur->next; cur=cur->next);
					cur->next = new;
				} else
					od->ssi.pending = new;
			}
		}
	}

	/* We're out of stuff to do, so tell the AIM servers we're done and exit */
	if (!od->ssi.pending) {
		if (od->ssi.in_transaction) {
			aim_ssi_modend(od);
			od->ssi.in_transaction = FALSE;
		}
		return 0;
	}

	/* If this is the first in a series of add/mod/del
	 * requests then send the "begin transaction" message. */
	if (!od->ssi.in_transaction)
	{
		aim_ssi_modbegin(od);
		od->ssi.in_transaction = TRUE;
	}

	/* Make sure we don't send anything else between now
	 * and when we receive the ack for the following operation */
	od->ssi.waiting_for_ack = TRUE;

	/* Now go mail off our data and wait 4 to 6 weeks */
	return aim_ssi_addmoddel(od);;
}

/**
 * Free all SSI data.
 *
 * This doesn't remove it from the server, that's different.
 *
 * @param od The oscar odion.
 * @return Return 0 if no errors, otherwise return the error number.
 */
static void
aim_ssi_freelist(OscarData *od)
{
	struct aim_ssi_item *cur, *del;
	struct aim_ssi_tmp *curtmp, *deltmp;

	cur = od->ssi.official;
	while (cur) {
		del = cur;
		cur = cur->next;
		g_free(del->name);
		aim_tlvlist_free(del->data);
		g_free(del);
	}

	cur = od->ssi.local;
	while (cur) {
		del = cur;
		cur = cur->next;
		g_free(del->name);
		aim_tlvlist_free(del->data);
		g_free(del);
	}

	curtmp = od->ssi.pending;
	while (curtmp) {
		deltmp = curtmp;
		curtmp = curtmp->next;
		g_free(deltmp);
	}

	od->ssi.numitems = 0;
	od->ssi.official = NULL;
	od->ssi.local = NULL;
	od->ssi.pending = NULL;
	od->ssi.timestamp = (time_t)0;
}

/**
 * This "cleans" the ssi list.  It does the following:
 * 1) Makes sure all buddies, permits, and denies have names.
 * 2) Makes sure that all buddies are in a group that exist.
 * 3) Deletes any empty groups
 *
 * @param od The oscar odion.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_cleanlist(OscarData *od)
{
	struct aim_ssi_item *cur, *next;

	if (!od)
		return -EINVAL;

	/* Delete any buddies, permits, or denies with empty names. */
	/* If there are any buddies directly in the master group, add them to a real group. */
	/* DESTROY any buddies that are directly in the master group. */
	/* Do the same for buddies that are in a non-existant group. */
	/* This will kind of mess up if you hit the item limit, but this function isn't too critical */
	cur = od->ssi.local;
	while (cur) {
		next = cur->next;
		if (!cur->name) {
			if (cur->type == AIM_SSI_TYPE_BUDDY)
				aim_ssi_delbuddy(od, NULL, NULL);
			else if (cur->type == AIM_SSI_TYPE_PERMIT)
				aim_ssi_delpermit(od, NULL);
			else if (cur->type == AIM_SSI_TYPE_DENY)
				aim_ssi_deldeny(od, NULL);
		} else if ((cur->type == AIM_SSI_TYPE_BUDDY) && ((cur->gid == 0x0000) || (!aim_ssi_itemlist_find(od->ssi.local, cur->gid, 0x0000)))) {
			char *alias = aim_ssi_getalias(od->ssi.local, NULL, cur->name);
			aim_ssi_addbuddy(od, cur->name, "orphans", NULL, alias, NULL, NULL, FALSE);
			aim_ssi_delbuddy(od, cur->name, NULL);
			g_free(alias);
		}
		cur = next;
	}

	/* Make sure there aren't any duplicate buddies in a group, or duplicate permits or denies */
	cur = od->ssi.local;
	while (cur) {
		if ((cur->type == AIM_SSI_TYPE_BUDDY) || (cur->type == AIM_SSI_TYPE_PERMIT) || (cur->type == AIM_SSI_TYPE_DENY))
		{
			struct aim_ssi_item *cur2, *next2;
			cur2 = cur->next;
			while (cur2) {
				next2 = cur2->next;
				if ((cur->type == cur2->type) && (cur->gid == cur2->gid) && (cur->name != NULL) && (cur2->name != NULL) && (!aim_sncmp(cur->name, cur2->name))) {
					aim_ssi_itemlist_del(&od->ssi.local, cur2);
				}
				cur2 = next2;
			}
		}
		cur = cur->next;
	}

	/* Check if the master group is empty */
	if ((cur = aim_ssi_itemlist_find(od->ssi.local, 0x0000, 0x0000)) && (!cur->data))
		aim_ssi_itemlist_del(&od->ssi.local, cur);

	/* If we've made any changes then sync our list with the server's */
	return aim_ssi_sync(od);
}

/**
 * Add a buddy to the list.
 *
 * @param od The oscar odion.
 * @param name The name of the item.
 * @param group The group of the item.
 * @param data A TLV list to use as the additional data for this item.
 * @param alias The alias/nickname of the item, or NULL.
 * @param comment The buddy comment for the item, or NULL.
 * @param smsnum The locally assigned SMS number, or NULL.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_addbuddy(OscarData *od, const char *name, const char *group, GSList *data, const char *alias, const char *comment, const char *smsnum, gboolean needauth)
{
	struct aim_ssi_item *parent;

	if (!od || !name || !group)
		return -EINVAL;

	/* Find the parent */
	if (!(parent = aim_ssi_itemlist_finditem(od->ssi.local, group, NULL, AIM_SSI_TYPE_GROUP))) {
		/* Find the parent's parent (the master group) */
		if (aim_ssi_itemlist_find(od->ssi.local, 0x0000, 0x0000) == NULL)
			aim_ssi_itemlist_add(&od->ssi.local, NULL, 0x0000, 0x0000, AIM_SSI_TYPE_GROUP, NULL);

		/* Add the parent */
		parent = aim_ssi_itemlist_add(&od->ssi.local, group, 0xFFFF, 0x0000, AIM_SSI_TYPE_GROUP, NULL);

		/* Modify the parent's parent (the master group) */
		aim_ssi_itemlist_rebuildgroup(od->ssi.local, NULL);
	}

	/* Create a TLV list for the new buddy */
	if (needauth)
		aim_tlvlist_add_noval(&data, 0x0066);
	if (alias != NULL)
		aim_tlvlist_add_str(&data, 0x0131, alias);
	if (smsnum != NULL)
		aim_tlvlist_add_str(&data, 0x013a, smsnum);
	if (comment != NULL)
		aim_tlvlist_add_str(&data, 0x013c, comment);

	/* Add that bad boy */
	aim_ssi_itemlist_add(&od->ssi.local, name, parent->gid, 0xFFFF, AIM_SSI_TYPE_BUDDY, data);
	aim_tlvlist_free(data);

	/* Modify the parent group */
	aim_ssi_itemlist_rebuildgroup(od->ssi.local, group);

	/* Sync our local list with the server list */
	return aim_ssi_sync(od);
}

/**
 * Add a permit buddy to the list.
 *
 * @param od The oscar odion.
 * @param name The name of the item..
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_addpermit(OscarData *od, const char *name)
{

	if (!od || !name || !od->ssi.received_data)
		return -EINVAL;

	/* Make sure the master group exists */
	if (aim_ssi_itemlist_find(od->ssi.local, 0x0000, 0x0000) == NULL)
		aim_ssi_itemlist_add(&od->ssi.local, NULL, 0x0000, 0x0000, AIM_SSI_TYPE_GROUP, NULL);

	/* Add that bad boy */
	aim_ssi_itemlist_add(&od->ssi.local, name, 0x0000, 0xFFFF, AIM_SSI_TYPE_PERMIT, NULL);

	/* Sync our local list with the server list */
	return aim_ssi_sync(od);
}

/**
 * Add a deny buddy to the list.
 *
 * @param od The oscar odion.
 * @param name The name of the item..
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_adddeny(OscarData *od, const char *name)
{

	if (!od || !name || !od->ssi.received_data)
		return -EINVAL;

	/* Make sure the master group exists */
	if (aim_ssi_itemlist_find(od->ssi.local, 0x0000, 0x0000) == NULL)
		aim_ssi_itemlist_add(&od->ssi.local, NULL, 0x0000, 0x0000, AIM_SSI_TYPE_GROUP, NULL);

	/* Add that bad boy */
	aim_ssi_itemlist_add(&od->ssi.local, name, 0x0000, 0xFFFF, AIM_SSI_TYPE_DENY, NULL);

	/* Sync our local list with the server list */
	return aim_ssi_sync(od);
}

/**
 * Deletes a buddy from the list.
 *
 * @param od The oscar odion.
 * @param name The name of the item, or NULL.
 * @param group The group of the item, or NULL.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_delbuddy(OscarData *od, const char *name, const char *group)
{
	struct aim_ssi_item *del;

	if (!od)
		return -EINVAL;

	/* Find the buddy */
	if (!(del = aim_ssi_itemlist_finditem(od->ssi.local, group, name, AIM_SSI_TYPE_BUDDY)))
		return -EINVAL;

	/* Remove the item from the list */
	aim_ssi_itemlist_del(&od->ssi.local, del);

	/* Modify the parent group */
	aim_ssi_itemlist_rebuildgroup(od->ssi.local, group);

	/* Sync our local list with the server list */
	return aim_ssi_sync(od);
}

/**
 * Deletes a group from the list.
 *
 * @param od The oscar odion.
 * @param group The name of the group.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_delgroup(OscarData *od, const char *group)
{
	struct aim_ssi_item *del;
	aim_tlv_t *tlv;

	if (!od)
		return -EINVAL;

	/* Find the group */
	if (!(del = aim_ssi_itemlist_finditem(od->ssi.local, group, NULL, AIM_SSI_TYPE_GROUP)))
		return -EINVAL;

	/* Don't delete the group if it's not empty */
	tlv = aim_tlv_gettlv(del->data, 0x00c8, 1);
	if (tlv && tlv->length > 0)
		return -EINVAL;

	/* Remove the item from the list */
	aim_ssi_itemlist_del(&od->ssi.local, del);

	/* Modify the parent group */
	aim_ssi_itemlist_rebuildgroup(od->ssi.local, group);

	/* Sync our local list with the server list */
	return aim_ssi_sync(od);
}

/**
 * Deletes a permit buddy from the list.
 *
 * @param od The oscar odion.
 * @param name The name of the item, or NULL.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_delpermit(OscarData *od, const char *name)
{
	struct aim_ssi_item *del;

	if (!od)
		return -EINVAL;

	/* Find the item */
	if (!(del = aim_ssi_itemlist_finditem(od->ssi.local, NULL, name, AIM_SSI_TYPE_PERMIT)))
		return -EINVAL;

	/* Remove the item from the list */
	aim_ssi_itemlist_del(&od->ssi.local, del);

	/* Sync our local list with the server list */
	return aim_ssi_sync(od);
}

/**
 * Deletes a deny buddy from the list.
 *
 * @param od The oscar odion.
 * @param name The name of the item, or NULL.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_deldeny(OscarData *od, const char *name)
{
	struct aim_ssi_item *del;

	if (!od)
		return -EINVAL;

	/* Find the item */
	if (!(del = aim_ssi_itemlist_finditem(od->ssi.local, NULL, name, AIM_SSI_TYPE_DENY)))
		return -EINVAL;

	/* Remove the item from the list */
	aim_ssi_itemlist_del(&od->ssi.local, del);

	/* Sync our local list with the server list */
	return aim_ssi_sync(od);
}

/**
 * Move a buddy from one group to another group.  This basically just deletes the
 * buddy and re-adds it.
 *
 * @param od The oscar odion.
 * @param oldgn The group that the buddy is currently in.
 * @param newgn The group that the buddy should be moved in to.
 * @param sn The name of the buddy to be moved.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_movebuddy(OscarData *od, const char *oldgn, const char *newgn, const char *sn)
{
	struct aim_ssi_item *buddy;
	GSList *data;

	/* Find the buddy */
	buddy = aim_ssi_itemlist_finditem(od->ssi.local, oldgn, sn, AIM_SSI_TYPE_BUDDY);
	if (buddy == NULL)
		return -EINVAL;

	/* Make a copy of the buddy's TLV list */
	data = aim_tlvlist_copy(buddy->data);

	/* Delete the old item */
	aim_ssi_delbuddy(od, sn, oldgn);

	/* Add the new item using the EXACT SAME TLV list */
	aim_ssi_addbuddy(od, sn, newgn, data, NULL, NULL, NULL, FALSE);

	return 0;
}

/**
 * Change the alias stored on the server for a given buddy.
 *
 * @param od The oscar odion.
 * @param gn The group that the buddy is currently in.
 * @param sn The screen name of the buddy.
 * @param alias The new alias for the buddy, or NULL if you want to remove
 *        a buddy's comment.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_aliasbuddy(OscarData *od, const char *gn, const char *sn, const char *alias)
{
	struct aim_ssi_item *tmp;

	if (!od || !gn || !sn)
		return -EINVAL;

	if (!(tmp = aim_ssi_itemlist_finditem(od->ssi.local, gn, sn, AIM_SSI_TYPE_BUDDY)))
		return -EINVAL;

	/* Either add or remove the 0x0131 TLV from the TLV chain */
	if ((alias != NULL) && (strlen(alias) > 0))
		aim_tlvlist_replace_str(&tmp->data, 0x0131, alias);
	else
		aim_tlvlist_remove(&tmp->data, 0x0131);

	/* Sync our local list with the server list */
	return aim_ssi_sync(od);
}

/**
 * Change the comment stored on the server for a given buddy.
 *
 * @param od The oscar odion.
 * @param gn The group that the buddy is currently in.
 * @param sn The screen name of the buddy.
 * @param alias The new comment for the buddy, or NULL if you want to remove
 *        a buddy's comment.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_editcomment(OscarData *od, const char *gn, const char *sn, const char *comment)
{
	struct aim_ssi_item *tmp;

	if (!od || !gn || !sn)
		return -EINVAL;

	if (!(tmp = aim_ssi_itemlist_finditem(od->ssi.local, gn, sn, AIM_SSI_TYPE_BUDDY)))
		return -EINVAL;

	/* Either add or remove the 0x0131 TLV from the TLV chain */
	if ((comment != NULL) && (strlen(comment) > 0))
		aim_tlvlist_replace_str(&tmp->data, 0x013c, comment);
	else
		aim_tlvlist_remove(&tmp->data, 0x013c);

	/* Sync our local list with the server list */
	return aim_ssi_sync(od);
}

/**
 * Rename a group.
 *
 * @param od The oscar odion.
 * @param oldgn The old group name.
 * @param newgn The new group name.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_rename_group(OscarData *od, const char *oldgn, const char *newgn)
{
	struct aim_ssi_item *group;

	if (!od || !oldgn || !newgn)
		return -EINVAL;

	if (!(group = aim_ssi_itemlist_finditem(od->ssi.local, oldgn, NULL, AIM_SSI_TYPE_GROUP)))
		return -EINVAL;

	g_free(group->name);
	group->name = (char *)g_malloc((strlen(newgn)+1)*sizeof(char));
	strcpy(group->name, newgn);

	/* Sync our local list with the server list */
	return aim_ssi_sync(od);
}

/**
 * Stores your permit/deny setting on the server, and starts using it.
 *
 * @param od The oscar odion.
 * @param permdeny Your permit/deny setting.  Can be one of the following:
 *        1 - Allow all users
 *        2 - Block all users
 *        3 - Allow only the users below
 *        4 - Block only the users below
 *        5 - Allow only users on my buddy list
 * @param vismask A bitmask of the class of users to whom you want to be
 *        visible.  See the AIM_FLAG_BLEH #defines in oscar.h
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_setpermdeny(OscarData *od, guint8 permdeny, guint32 vismask)
{
	struct aim_ssi_item *tmp;

	if (!od || !od->ssi.received_data)
		return -EINVAL;

	/* Find the PDINFO item, or add it if it does not exist */
	if (!(tmp = aim_ssi_itemlist_finditem(od->ssi.local, NULL, NULL, AIM_SSI_TYPE_PDINFO))) {
		/* Make sure the master group exists */
		if (aim_ssi_itemlist_find(od->ssi.local, 0x0000, 0x0000) == NULL)
			aim_ssi_itemlist_add(&od->ssi.local, NULL, 0x0000, 0x0000, AIM_SSI_TYPE_GROUP, NULL);

		tmp = aim_ssi_itemlist_add(&od->ssi.local, NULL, 0x0000, 0xFFFF, AIM_SSI_TYPE_PDINFO, NULL);
	}

	/* Need to add the 0x00ca TLV to the TLV chain */
	aim_tlvlist_replace_8(&tmp->data, 0x00ca, permdeny);

	/* Need to add the 0x00cb TLV to the TLV chain */
	aim_tlvlist_replace_32(&tmp->data, 0x00cb, vismask);

	/* Sync our local list with the server list */
	return aim_ssi_sync(od);
}

/**
 * Set buddy icon information
 *
 * @param od The oscar odion.
 * @param iconcsum The MD5 checksum of the icon you are using.
 * @param iconcsumlen Length of the MD5 checksum given above.  Should be 0x10 bytes.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_seticon(OscarData *od, const guint8 *iconsum, guint8 iconsumlen)
{
	struct aim_ssi_item *tmp;
	guint8 *csumdata;

	if (!od || !iconsum || !iconsumlen || !od->ssi.received_data)
		return -EINVAL;

	/* Find the ICONINFO item, or add it if it does not exist */
	if (!(tmp = aim_ssi_itemlist_finditem(od->ssi.local, NULL, "1", AIM_SSI_TYPE_ICONINFO))) {
		/* Make sure the master group exists */
		if (aim_ssi_itemlist_find(od->ssi.local, 0x0000, 0x0000) == NULL)
			aim_ssi_itemlist_add(&od->ssi.local, NULL, 0x0000, 0x0000, AIM_SSI_TYPE_GROUP, NULL);

		tmp = aim_ssi_itemlist_add(&od->ssi.local, "1", 0x0000, 0xFFFF, AIM_SSI_TYPE_ICONINFO, NULL);
	}

	/* Need to add the 0x00d5 TLV to the TLV chain */
	csumdata = (guint8 *)g_malloc((iconsumlen+2)*sizeof(guint8));
	aimutil_put8(&csumdata[0], 0x00);
	aimutil_put8(&csumdata[1], iconsumlen);
	memcpy(&csumdata[2], iconsum, iconsumlen);
	aim_tlvlist_replace_raw(&tmp->data, 0x00d5, (iconsumlen+2) * sizeof(guint8), csumdata);
	g_free(csumdata);

	/* Need to add the 0x0131 TLV to the TLV chain, used to cache the icon */
	aim_tlvlist_replace_noval(&tmp->data, 0x0131);

	/* Sync our local list with the server list */
	aim_ssi_sync(od);
	return 0;
}

/**
 * Remove a reference to a server stored buddy icon.  This will make your
 * icon stop showing up to other people.
 *
 * Really this function just sets the icon to a dummy value.  It's weird...
 * but I think the dummy value basically means "I don't have an icon!"
 *
 * @param od The oscar session.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_delicon(OscarData *od)
{
	const guint8 csumdata[] = {0x02, 0x01, 0xd2, 0x04, 0x72};

	return aim_ssi_seticon(od, csumdata, 5);
}

/**
 * Stores your setting for various SSI settings.  Whether you
 * should show up as idle or not, etc.
 *
 * @param od The oscar odion.
 * @param presence I think it's a bitmask, but I only know what one of the bits is:
 *        0x00000002 - Hide wireless?
 *        0x00000400 - Allow others to see your idle time
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_setpresence(OscarData *od, guint32 presence) {
	struct aim_ssi_item *tmp;

	if (!od || !od->ssi.received_data)
		return -EINVAL;

	/* Find the PRESENCEPREFS item, or add it if it does not exist */
	if (!(tmp = aim_ssi_itemlist_finditem(od->ssi.local, NULL, NULL, AIM_SSI_TYPE_PRESENCEPREFS))) {
		/* Make sure the master group exists */
		if (aim_ssi_itemlist_find(od->ssi.local, 0x0000, 0x0000) == NULL)
			aim_ssi_itemlist_add(&od->ssi.local, NULL, 0x0000, 0x0000, AIM_SSI_TYPE_GROUP, NULL);

		tmp = aim_ssi_itemlist_add(&od->ssi.local, NULL, 0x0000, 0xFFFF, AIM_SSI_TYPE_PRESENCEPREFS, NULL);
	}

	/* Need to add the x00c9 TLV to the TLV chain */
	aim_tlvlist_replace_32(&tmp->data, 0x00c9, presence);

	/* Sync our local list with the server list */
	return aim_ssi_sync(od);
}

/*
 * Subtype 0x0002 - Request SSI Rights.
 */
int aim_ssi_reqrights(OscarData *od)
{
	FlapConnection *conn;

	if (!od || !(conn = flap_connection_findbygroup(od, SNAC_FAMILY_FEEDBAG)))
		return -EINVAL;

	aim_genericreq_n_snacid(od, conn, SNAC_FAMILY_FEEDBAG, SNAC_SUBTYPE_FEEDBAG_REQRIGHTS);

	return 0;
}

/*
 * Subtype 0x0003 - SSI Rights Information.
 */
static int parserights(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
	int ret = 0, i;
	aim_rxcallback_t userfunc;
	GSList *tlvlist;
	aim_tlv_t *tlv;
	ByteStream bstream;
	guint16 *maxitems;

	/* This SNAC is made up of a bunch of TLVs */
	tlvlist = aim_tlvlist_read(bs);

	/* TLV 0x0004 contains the maximum number of each item */
	if (!(tlv = aim_tlv_gettlv(tlvlist, 0x0004, 1))) {
		aim_tlvlist_free(tlvlist);
		return 0;
	}

	byte_stream_init(&bstream, tlv->value, tlv->length);

	maxitems = (guint16 *)g_malloc((tlv->length/2)*sizeof(guint16));

	for (i=0; i<(tlv->length/2); i++)
		maxitems[i] = byte_stream_get16(&bstream);

	if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
		ret = userfunc(od, conn, frame, tlv->length/2, maxitems);

	aim_tlvlist_free(tlvlist);
	g_free(maxitems);

	return ret;
}

/*
 * Subtype 0x0004 - Request SSI Data when you don't have a timestamp and
 * revision number.
 *
 */
int aim_ssi_reqdata(OscarData *od)
{
	FlapConnection *conn;

	if (!od || !(conn = flap_connection_findbygroup(od, SNAC_FAMILY_FEEDBAG)))
		return -EINVAL;

	/* Free any current data, just in case */
	aim_ssi_freelist(od);

	aim_genericreq_n_snacid(od, conn, SNAC_FAMILY_FEEDBAG, SNAC_SUBTYPE_FEEDBAG_REQDATA);

	return 0;
}

/*
 * Subtype 0x0005 - Request SSI Data when you have a timestamp and revision
 * number.
 *
 * The data will only be sent if it is newer than the posted local
 * timestamp and revision.
 *
 * Note that the client should never increment the revision, only the server.
 *
 */
int aim_ssi_reqifchanged(OscarData *od, time_t timestamp, guint16 numitems)
{
	FlapConnection *conn;
	FlapFrame *frame;
	aim_snacid_t snacid;

	if (!od || !(conn = flap_connection_findbygroup(od, SNAC_FAMILY_FEEDBAG)))
		return -EINVAL;

	frame = flap_frame_new(od, 0x02, 10+4+2);

	snacid = aim_cachesnac(od, SNAC_FAMILY_FEEDBAG, SNAC_SUBTYPE_FEEDBAG_REQIFCHANGED, 0x0000, NULL, 0);

	aim_putsnac(&frame->data, SNAC_FAMILY_FEEDBAG, SNAC_SUBTYPE_FEEDBAG_REQIFCHANGED, 0x0000, snacid);
	byte_stream_put32(&frame->data, timestamp);
	byte_stream_put16(&frame->data, numitems);

	flap_connection_send(conn, frame);

	/* Free any current data, just in case */
	aim_ssi_freelist(od);

	return 0;
}

/*
 * Subtype 0x0006 - SSI Data.
 */
static int parsedata(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
	int ret = 0;
	aim_rxcallback_t userfunc;
	guint8 fmtver; /* guess */
	guint16 namelen, gid, bid, type;
	char *name;
	GSList *data;

	fmtver = byte_stream_get8(bs); /* Version of ssi data.  Should be 0x00 */
	od->ssi.numitems += byte_stream_get16(bs); /* # of items in this SSI SNAC */

	/* Read in the list */
	while (byte_stream_empty(bs) > 4) { /* last four bytes are timestamp */
		if ((namelen = byte_stream_get16(bs)))
			name = byte_stream_getstr(bs, namelen);
		else
			name = NULL;
		gid = byte_stream_get16(bs);
		bid = byte_stream_get16(bs);
		type = byte_stream_get16(bs);
		data = aim_tlvlist_readlen(bs, byte_stream_get16(bs));
		aim_ssi_itemlist_add(&od->ssi.official, name, gid, bid, type, data);
		g_free(name);
		aim_tlvlist_free(data);
	}

	/* Read in the timestamp */
	od->ssi.timestamp = byte_stream_get32(bs);

	if (!(snac->flags & 0x0001)) {
		/* Make a copy of the list */
		struct aim_ssi_item *cur;
		for (cur=od->ssi.official; cur; cur=cur->next)
			aim_ssi_itemlist_add(&od->ssi.local, cur->name, cur->gid, cur->bid, cur->type, cur->data);

		od->ssi.received_data = TRUE;

		if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
			ret = userfunc(od, conn, frame, fmtver, od->ssi.numitems, od->ssi.timestamp);
	}

	return ret;
}

/*
 * Subtype 0x0007 - SSI Activate Data.
 *
 * Should be sent after receiving 13/6 or 13/f to tell the server you
 * are ready to begin using the list.  It will promptly give you the
 * presence information for everyone in your list and put your permit/deny
 * settings into effect.
 *
 */
int aim_ssi_enable(OscarData *od)
{
	FlapConnection *conn;

	if (!od || !(conn = flap_connection_findbygroup(od, SNAC_FAMILY_FEEDBAG)))
		return -EINVAL;

	aim_genericreq_n(od, conn, SNAC_FAMILY_FEEDBAG, 0x0007);

	return 0;
}

/*
 * Subtype 0x0008/0x0009/0x000a - SSI Add/Mod/Del Item(s).
 *
 * Sends the SNAC to add, modify, or delete items from the server-stored
 * information.  These 3 SNACs all have an identical structure.  The only
 * difference is the subtype that is set for the SNAC.
 *
 */
static int aim_ssi_addmoddel(OscarData *od)
{
	FlapConnection *conn;
	FlapFrame *frame;
	aim_snacid_t snacid;
	int snaclen;
	struct aim_ssi_tmp *cur;

	if (!od || !(conn = flap_connection_findbygroup(od, SNAC_FAMILY_FEEDBAG)) || !od->ssi.pending || !od->ssi.pending->item)
		return -EINVAL;

	/* Calculate total SNAC size */
	snaclen = 10; /* For family, subtype, flags, and SNAC ID */
	for (cur=od->ssi.pending; cur; cur=cur->next) {
		snaclen += 10; /* For length, GID, BID, type, and length */
		if (cur->item->name)
			snaclen += strlen(cur->item->name);
		if (cur->item->data)
			snaclen += aim_tlvlist_size(cur->item->data);
	}

	frame = flap_frame_new(od, 0x02, snaclen);

	snacid = aim_cachesnac(od, SNAC_FAMILY_FEEDBAG, od->ssi.pending->action, 0x0000, NULL, 0);
	aim_putsnac(&frame->data, SNAC_FAMILY_FEEDBAG, od->ssi.pending->action, 0x0000, snacid);

	for (cur=od->ssi.pending; cur; cur=cur->next) {
		byte_stream_put16(&frame->data, cur->item->name ? strlen(cur->item->name) : 0);
		if (cur->item->name)
			byte_stream_putstr(&frame->data, cur->item->name);
		byte_stream_put16(&frame->data, cur->item->gid);
		byte_stream_put16(&frame->data, cur->item->bid);
		byte_stream_put16(&frame->data, cur->item->type);
		byte_stream_put16(&frame->data, cur->item->data ? aim_tlvlist_size(cur->item->data) : 0);
		if (cur->item->data)
			aim_tlvlist_write(&frame->data, &cur->item->data);
	}

	flap_connection_send(conn, frame);

	return 0;
}

/*
 * Subtype 0x0008 - Incoming SSI add.
 *
 * Sent by the server, for example, when someone is added to
 * your "Recent Buddies" group.
 */
static int parseadd(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
	int ret = 0;
	aim_rxcallback_t userfunc;
	char *name;
	guint16 len, gid, bid, type;
	GSList *data;

	while (byte_stream_empty(bs)) {
		if ((len = byte_stream_get16(bs)))
			name = byte_stream_getstr(bs, len);
		else
			name = NULL;
		gid = byte_stream_get16(bs);
		bid = byte_stream_get16(bs);
		type = byte_stream_get16(bs);
		if ((len = byte_stream_get16(bs)))
			data = aim_tlvlist_readlen(bs, len);
		else
			data = NULL;

		aim_ssi_itemlist_add(&od->ssi.local, name, gid, bid, type, data);
		aim_ssi_itemlist_add(&od->ssi.official, name, gid, bid, type, data);
		aim_tlvlist_free(data);

		if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
			ret = userfunc(od, conn, frame, type, name);

		g_free(name);
	}

	return ret;
}

/*
 * Subtype 0x0009 - Incoming SSI mod.
 *
 * XXX - It would probably be good for the client to actually do something when it gets this.
 */
static int parsemod(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
	int ret = 0;
	aim_rxcallback_t userfunc;
	char *name;
	guint16 len, gid, bid, type;
	GSList *data;
	struct aim_ssi_item *item;

	while (byte_stream_empty(bs)) {
		if ((len = byte_stream_get16(bs)))
			name = byte_stream_getstr(bs, len);
		else
			name = NULL;
		gid = byte_stream_get16(bs);
		bid = byte_stream_get16(bs);
		type = byte_stream_get16(bs);
		if ((len = byte_stream_get16(bs)))
			data = aim_tlvlist_readlen(bs, len);
		else
			data = NULL;

		/* Replace the 2 local items with the given one */
		if ((item = aim_ssi_itemlist_find(od->ssi.local, gid, bid))) {
			item->type = type;
			g_free(item->name);
			if (name) {
				item->name = (char *)g_malloc((strlen(name)+1)*sizeof(char));
				strcpy(item->name, name);
			} else
				item->name = NULL;
			aim_tlvlist_free(item->data);
			item->data = aim_tlvlist_copy(data);
		}

		if ((item = aim_ssi_itemlist_find(od->ssi.official, gid, bid))) {
			item->type = type;
			g_free(item->name);
			if (name) {
				item->name = (char *)g_malloc((strlen(name)+1)*sizeof(char));
				strcpy(item->name, name);
			} else
				item->name = NULL;
			aim_tlvlist_free(item->data);
			item->data = aim_tlvlist_copy(data);
		}

		if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
			ret = userfunc(od, conn, frame);

		g_free(name);
		aim_tlvlist_free(data);
	}

	return ret;
}

/*
 * Subtype 0x000a - Incoming SSI del.
 *
 * XXX - It would probably be good for the client to actually do something when it gets this.
 */
static int parsedel(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
	int ret = 0;
	aim_rxcallback_t userfunc;
	guint16 gid, bid;
	struct aim_ssi_item *del;

	while (byte_stream_empty(bs)) {
		byte_stream_advance(bs, byte_stream_get16(bs));
		gid = byte_stream_get16(bs);
		bid = byte_stream_get16(bs);
		byte_stream_get16(bs);
		byte_stream_advance(bs, byte_stream_get16(bs));

		if ((del = aim_ssi_itemlist_find(od->ssi.local, gid, bid)))
			aim_ssi_itemlist_del(&od->ssi.local, del);
		if ((del = aim_ssi_itemlist_find(od->ssi.official, gid, bid)))
			aim_ssi_itemlist_del(&od->ssi.official, del);

		if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
			ret = userfunc(od, conn, frame);
	}

	return ret;
}

/*
 * Subtype 0x000e - SSI Add/Mod/Del Ack.
 *
 * Response to add, modify, or delete SNAC (sent with aim_ssi_addmoddel).
 *
 */
static int parseack(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
	int ret = 0;
	aim_rxcallback_t userfunc;
	struct aim_ssi_tmp *cur, *del;

	/* Read in the success/failure flags from the ack SNAC */
	cur = od->ssi.pending;
	while (cur && (byte_stream_empty(bs)>0)) {
		cur->ack = byte_stream_get16(bs);
		cur = cur->next;
	}

	/*
	 * If outcome is 0, then add the item to the item list, or replace the other item,
	 * or remove the old item.  If outcome is non-zero, then remove the item from the
	 * local list, or unmodify it, or add it.
	 */
	for (cur=od->ssi.pending; (cur && (cur->ack != 0xffff)); cur=cur->next) {
	if (cur->item) {
		if (cur->ack) {
			/* Our action was unsuccessful, so change the local list back to how it was */
			if (cur->action == SNAC_SUBTYPE_FEEDBAG_ADD) {
				/* Remove the item from the local list */
				/* Make sure cur->item is still valid memory */
				if (aim_ssi_itemlist_valid(od->ssi.local, cur->item)) {
					if (cur->item->name) {
						cur->name = (char *)g_malloc((strlen(cur->item->name)+1)*sizeof(char));
						strcpy(cur->name, cur->item->name);
					}
					aim_ssi_itemlist_del(&od->ssi.local, cur->item);
				}
				cur->item = NULL;

			} else if (cur->action == SNAC_SUBTYPE_FEEDBAG_MOD) {
				/* Replace the local item with the item from the official list */
				if (aim_ssi_itemlist_valid(od->ssi.local, cur->item)) {
					struct aim_ssi_item *cur1;
					if ((cur1 = aim_ssi_itemlist_find(od->ssi.official, cur->item->gid, cur->item->bid))) {
						g_free(cur->item->name);
						if (cur1->name) {
							cur->item->name = (char *)g_malloc((strlen(cur1->name)+1)*sizeof(char));
							strcpy(cur->item->name, cur1->name);
						} else
							cur->item->name = NULL;
						aim_tlvlist_free(cur->item->data);
						cur->item->data = aim_tlvlist_copy(cur1->data);
					}
				} else
					cur->item = NULL;

			} else if (cur->action == SNAC_SUBTYPE_FEEDBAG_DEL) {
				/* Add the item back into the local list */
				if (aim_ssi_itemlist_valid(od->ssi.official, cur->item)) {
					aim_ssi_itemlist_add(&od->ssi.local, cur->item->name, cur->item->gid, cur->item->bid, cur->item->type, cur->item->data);
				} else
					cur->item = NULL;
			}

		} else {
			/* Do the exact opposite */
			if (cur->action == SNAC_SUBTYPE_FEEDBAG_ADD) {
			/* Add the local item to the official list */
				if (aim_ssi_itemlist_valid(od->ssi.local, cur->item)) {
					aim_ssi_itemlist_add(&od->ssi.official, cur->item->name, cur->item->gid, cur->item->bid, cur->item->type, cur->item->data);
				} else
					cur->item = NULL;

			} else if (cur->action == SNAC_SUBTYPE_FEEDBAG_MOD) {
				/* Replace the official item with the item from the local list */
				if (aim_ssi_itemlist_valid(od->ssi.local, cur->item)) {
					struct aim_ssi_item *cur1;
					if ((cur1 = aim_ssi_itemlist_find(od->ssi.official, cur->item->gid, cur->item->bid))) {
						g_free(cur1->name);
						if (cur->item->name) {
							cur1->name = (char *)g_malloc((strlen(cur->item->name)+1)*sizeof(char));
							strcpy(cur1->name, cur->item->name);
						} else
							cur1->name = NULL;
						aim_tlvlist_free(cur1->data);
						cur1->data = aim_tlvlist_copy(cur->item->data);
					}
				} else
					cur->item = NULL;

			} else if (cur->action == SNAC_SUBTYPE_FEEDBAG_DEL) {
				/* Remove the item from the official list */
				if (aim_ssi_itemlist_valid(od->ssi.official, cur->item))
					aim_ssi_itemlist_del(&od->ssi.official, cur->item);
				cur->item = NULL;
			}

		}
	} /* End if (cur->item) */
	} /* End for loop */

	if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
		ret = userfunc(od, conn, frame, od->ssi.pending);

	/* Free all aim_ssi_tmp's with an outcome */
	cur = od->ssi.pending;
	while (cur && (cur->ack != 0xffff)) {
		del = cur;
		cur = cur->next;
		g_free(del->name);
		g_free(del);
	}
	od->ssi.pending = cur;

	/* If we're not waiting for any more acks, then send more SNACs */
	if (!od->ssi.pending) {
		od->ssi.waiting_for_ack = FALSE;
		aim_ssi_sync(od);
	}

	return ret;
}

/*
 * Subtype 0x000f - SSI Data Unchanged.
 *
 * Response to aim_ssi_reqifchanged() if the server-side data is not newer than
 * posted local stamp/revision.
 *
 */
static int parsedataunchanged(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
	int ret = 0;
	aim_rxcallback_t userfunc;

	od->ssi.received_data = TRUE;

	if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
		ret = userfunc(od, conn, frame);

	return ret;
}

/*
 * Subtype 0x0011 - SSI Begin Data Modification.
 *
 * Tell the server you're going to start modifying data.  This marks
 * the beginning of a transaction.
 */
int aim_ssi_modbegin(OscarData *od)
{
	FlapConnection *conn;

	if (!od || !(conn = flap_connection_findbygroup(od, SNAC_FAMILY_FEEDBAG)))
		return -EINVAL;

	aim_genericreq_n(od, conn, SNAC_FAMILY_FEEDBAG, SNAC_SUBTYPE_FEEDBAG_EDITSTART);

	return 0;
}

/*
 * Subtype 0x0012 - SSI End Data Modification.
 *
 * Tell the server you're finished modifying data.  The marks the end
 * of a transaction.
 */
int aim_ssi_modend(OscarData *od)
{
	FlapConnection *conn;

	if (!od || !(conn = flap_connection_findbygroup(od, SNAC_FAMILY_FEEDBAG)))
		return -EINVAL;

	aim_genericreq_n(od, conn, SNAC_FAMILY_FEEDBAG, SNAC_SUBTYPE_FEEDBAG_EDITSTOP);

	return 0;
}

/*
 * Subtype 0x0014 - Grant authorization
 *
 * Authorizes a contact so they can add you to their contact list.
 *
 */
int aim_ssi_sendauth(OscarData *od, char *sn, char *msg)
{
	FlapConnection *conn;
	FlapFrame *frame;
	aim_snacid_t snacid;

	if (!od || !(conn = flap_connection_findbygroup(od, SNAC_FAMILY_FEEDBAG)) || !sn)
		return -EINVAL;

	frame = flap_frame_new(od, 0x02, 10+1+strlen(sn)+2+(msg ? strlen(msg)+1 : 0)+2);

	snacid = aim_cachesnac(od, SNAC_FAMILY_FEEDBAG, SNAC_SUBTYPE_FEEDBAG_SENDAUTH, 0x0000, NULL, 0);
	aim_putsnac(&frame->data, SNAC_FAMILY_FEEDBAG, SNAC_SUBTYPE_FEEDBAG_SENDAUTH, 0x0000, snacid);

	/* Screen name */
	byte_stream_put8(&frame->data, strlen(sn));
	byte_stream_putstr(&frame->data, sn);

	/* Message (null terminated) */
	byte_stream_put16(&frame->data, msg ? strlen(msg) : 0);
	if (msg) {
		byte_stream_putstr(&frame->data, msg);
		byte_stream_put8(&frame->data, 0x00);
	}

	/* Unknown */
	byte_stream_put16(&frame->data, 0x0000);

	flap_connection_send(conn, frame);

	return 0;
}

/*
 * Subtype 0x0015 - Receive an authorization grant
 */
static int receiveauthgrant(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
	int ret = 0;
	aim_rxcallback_t userfunc;
	guint16 tmp;
	char *sn, *msg;

	/* Read screen name */
	if ((tmp = byte_stream_get8(bs)))
		sn = byte_stream_getstr(bs, tmp);
	else
		sn = NULL;

	/* Read message (null terminated) */
	if ((tmp = byte_stream_get16(bs)))
		msg = byte_stream_getstr(bs, tmp);
	else
		msg = NULL;

	/* Unknown */
	tmp = byte_stream_get16(bs);

	if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
		ret = userfunc(od, conn, frame, sn, msg);

	g_free(sn);
	g_free(msg);

	return ret;
}

/*
 * Subtype 0x0018 - Send authorization request
 *
 * Sends a request for authorization to the given contact.  The request will either be
 * granted, denied, or dropped.
 *
 */
int aim_ssi_sendauthrequest(OscarData *od, char *sn, const char *msg)
{
	FlapConnection *conn;
	FlapFrame *frame;
	aim_snacid_t snacid;

	if (!od || !(conn = flap_connection_findbygroup(od, SNAC_FAMILY_FEEDBAG)) || !sn)
		return -EINVAL;

	frame = flap_frame_new(od, 0x02, 10+1+strlen(sn)+2+(msg ? strlen(msg)+1 : 0)+2);

	snacid = aim_cachesnac(od, SNAC_FAMILY_FEEDBAG, SNAC_SUBTYPE_FEEDBAG_SENDAUTHREQ, 0x0000, NULL, 0);
	aim_putsnac(&frame->data, SNAC_FAMILY_FEEDBAG, SNAC_SUBTYPE_FEEDBAG_SENDAUTHREQ, 0x0000, snacid);

	/* Screen name */
	byte_stream_put8(&frame->data, strlen(sn));
	byte_stream_putstr(&frame->data, sn);

	/* Message (null terminated) */
	byte_stream_put16(&frame->data, msg ? strlen(msg) : 0);
	if (msg) {
		byte_stream_putstr(&frame->data, msg);
		byte_stream_put8(&frame->data, 0x00);
	}

	/* Unknown */
	byte_stream_put16(&frame->data, 0x0000);

	flap_connection_send(conn, frame);

	return 0;
}

/*
 * Subtype 0x0019 - Receive an authorization request
 */
static int receiveauthrequest(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
	int ret = 0;
	aim_rxcallback_t userfunc;
	guint16 tmp;
	char *sn, *msg;

	/* Read screen name */
	if ((tmp = byte_stream_get8(bs)))
		sn = byte_stream_getstr(bs, tmp);
	else
		sn = NULL;

	/* Read message (null terminated) */
	if ((tmp = byte_stream_get16(bs)))
		msg = byte_stream_getstr(bs, tmp);
	else
		msg = NULL;

	/* Unknown */
	tmp = byte_stream_get16(bs);

	if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
		ret = userfunc(od, conn, frame, sn, msg);

	g_free(sn);
	g_free(msg);

	return ret;
}

/*
 * Subtype 0x001a - Send authorization reply
 *
 * Sends a reply to a request for authorization.  The reply can either
 * grant authorization or deny authorization.
 *
 * if reply=0x00 then deny
 * if reply=0x01 then grant
 *
 */
int aim_ssi_sendauthreply(OscarData *od, char *sn, guint8 reply, const char *msg)
{
	FlapConnection *conn;
	FlapFrame *frame;
	aim_snacid_t snacid;

	if (!od || !(conn = flap_connection_findbygroup(od, SNAC_FAMILY_FEEDBAG)) || !sn)
		return -EINVAL;

	frame = flap_frame_new(od, 0x02, 10 + 1+strlen(sn) + 1 + 2+(msg ? strlen(msg)+1 : 0) + 2);

	snacid = aim_cachesnac(od, SNAC_FAMILY_FEEDBAG, SNAC_SUBTYPE_FEEDBAG_SENDAUTHREP, 0x0000, NULL, 0);
	aim_putsnac(&frame->data, SNAC_FAMILY_FEEDBAG, SNAC_SUBTYPE_FEEDBAG_SENDAUTHREP, 0x0000, snacid);

	/* Screen name */
	byte_stream_put8(&frame->data, strlen(sn));
	byte_stream_putstr(&frame->data, sn);

	/* Grant or deny */
	byte_stream_put8(&frame->data, reply);

	/* Message (null terminated) */
	byte_stream_put16(&frame->data, msg ? (strlen(msg)+1) : 0);
	if (msg) {
		byte_stream_putstr(&frame->data, msg);
		byte_stream_put8(&frame->data, 0x00);
	}

	/* Unknown */
	byte_stream_put16(&frame->data, 0x0000);

	flap_connection_send(conn, frame);

	return 0;
}

/*
 * Subtype 0x001b - Receive an authorization reply
 *
 * You get this bad boy when other people respond to the authorization
 * request that you have previously sent them.
 */
static int receiveauthreply(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
	int ret = 0;
	aim_rxcallback_t userfunc;
	guint16 tmp;
	guint8 reply;
	char *sn, *msg;

	/* Read screen name */
	if ((tmp = byte_stream_get8(bs)))
		sn = byte_stream_getstr(bs, tmp);
	else
		sn = NULL;

	/* Read reply */
	reply = byte_stream_get8(bs);

	/* Read message (null terminated) */
	if ((tmp = byte_stream_get16(bs)))
		msg = byte_stream_getstr(bs, tmp);
	else
		msg = NULL;

	/* Unknown */
	tmp = byte_stream_get16(bs);

	if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
		ret = userfunc(od, conn, frame, sn, reply, msg);

	g_free(sn);
	g_free(msg);

	return ret;
}

/*
 * Subtype 0x001c - Receive a message telling you someone added you to their list.
 */
static int receiveadded(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
	int ret = 0;
	aim_rxcallback_t userfunc;
	guint16 tmp;
	char *sn;

	/* Read screen name */
	if ((tmp = byte_stream_get8(bs)))
		sn = byte_stream_getstr(bs, tmp);
	else
		sn = NULL;

	if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
		ret = userfunc(od, conn, frame, sn);

	g_free(sn);

	return ret;
}

static int
snachandler(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
	if (snac->subtype == SNAC_SUBTYPE_FEEDBAG_RIGHTSINFO)
		return parserights(od, conn, mod, frame, snac, bs);
	else if (snac->subtype == SNAC_SUBTYPE_FEEDBAG_LIST)
		return parsedata(od, conn, mod, frame, snac, bs);
	else if (snac->subtype == SNAC_SUBTYPE_FEEDBAG_ADD)
		return parseadd(od, conn, mod, frame, snac, bs);
	else if (snac->subtype == SNAC_SUBTYPE_FEEDBAG_MOD)
		return parsemod(od, conn, mod, frame, snac, bs);
	else if (snac->subtype == SNAC_SUBTYPE_FEEDBAG_DEL)
		return parsedel(od, conn, mod, frame, snac, bs);
	else if (snac->subtype == SNAC_SUBTYPE_FEEDBAG_SRVACK)
		return parseack(od, conn, mod, frame, snac, bs);
	else if (snac->subtype == SNAC_SUBTYPE_FEEDBAG_NOLIST)
		return parsedataunchanged(od, conn, mod, frame, snac, bs);
	else if (snac->subtype == SNAC_SUBTYPE_FEEDBAG_RECVAUTH)
		return receiveauthgrant(od, conn, mod, frame, snac, bs);
	else if (snac->subtype == SNAC_SUBTYPE_FEEDBAG_RECVAUTHREQ)
		return receiveauthrequest(od, conn, mod, frame, snac, bs);
	else if (snac->subtype == SNAC_SUBTYPE_FEEDBAG_RECVAUTHREP)
		return receiveauthreply(od, conn, mod, frame, snac, bs);
	else if (snac->subtype == SNAC_SUBTYPE_FEEDBAG_ADDED)
		return receiveadded(od, conn, mod, frame, snac, bs);

	return 0;
}

static void
ssi_shutdown(OscarData *od, aim_module_t *mod)
{
	aim_ssi_freelist(od);
}

int
ssi_modfirst(OscarData *od, aim_module_t *mod)
{
	mod->family = SNAC_FAMILY_FEEDBAG;
	mod->version = 0x0004;
	mod->toolid = 0x0110;
	mod->toolversion = 0x0629;
	mod->flags = 0;
	strncpy(mod->name, "feedbag", sizeof(mod->name));
	mod->snachandler = snachandler;
	mod->shutdown = ssi_shutdown;

	return 0;
}