/*
  *   IRC - Internet Relay Chat, src/modules/topic.c
  *   (C) 2004-present The UnrealIRCd Team
  *
  *   See file AUTHORS in IRC package for additional names of
  *   the programmers.
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
  *   the Free Software Foundation; either version 1, or (at your option)
  *   any later version.
  *
  *   This program 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 General Public License for more details.
  *
  *   You should have received a copy of the GNU General Public License
  *   along with this program; if not, write to the Free Software
  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 #include "unrealircd.h"
 
 CMD_FUNC(cmd_topic);
 
 #define MSG_TOPIC 	"TOPIC"
 
 ModuleHeader MOD_HEADER
   = {
 	"topic",
 	"5.0",
 	"command /topic", 
 	"UnrealIRCd Team",
 	"unrealircd-6",
     };
 
 /* Forward declarations */
 void _set_channel_topic(Client *client, Channel *channel, MessageTag *recv_mtags, const char *topic, const char *set_by, time_t set_at);
 
 MOD_TEST()
 {
 	MARK_AS_OFFICIAL_MODULE(modinfo);
 	EfunctionAddVoid(modinfo->handle, EFUNC_SET_CHANNEL_TOPIC, _set_channel_topic);
 	return MOD_SUCCESS;
 }
 
 MOD_INIT()
 {
 	CommandAdd(modinfo->handle, MSG_TOPIC, cmd_topic, 4, CMD_USER|CMD_SERVER);
 	MARK_AS_OFFICIAL_MODULE(modinfo);
 	return MOD_SUCCESS;
 }
 
 MOD_LOAD()
 {
 	return MOD_SUCCESS;
 }
 
 MOD_UNLOAD()
 {
 	return MOD_SUCCESS;
 }
 
 void topic_operoverride_msg(Client *client, Channel *channel, const char *topic)
 {
 	unreal_log(ULOG_INFO, "operoverride", "OPEROVERRIDE_TOPIC", client,
 		   "OperOverride: $client.details changed the topic of $channel to '$topic'",
 		   log_data_string("override_type", "topic"),
 		   log_data_string("topic", topic),
 		   log_data_channel("channel", channel));
 }
 
 /** Query or change the channel topic.
  *
  * Syntax for clients:
  * parv[1] = channel
  * parv[2] = new topic
  *
  * Syntax for server to server traffic:
  * parv[1] = channel name
  * parv[2] = topic nickname
  * parv[3] = topic time
  * parv[4] = topic text
  */
 CMD_FUNC(cmd_topic)
 {
 	Channel *channel = NULL;
 	const char *topic = NULL;
 	const char *name, *tnick = client->name;
 	const char *errmsg = NULL;
 	time_t ttime = 0;
 	int i = 0;
 	Hook *h;
 	MessageTag *mtags = NULL;
 
 	if ((parc < 2) || BadPtr(parv[1]))
 	{
 		sendnumeric(client, ERR_NEEDMOREPARAMS, "TOPIC");
 		return;
 	}
 
 	name = parv[1];
 
 	channel = find_channel(parv[1]);
 	if (!channel)
 	{
 		sendnumeric(client, ERR_NOSUCHCHANNEL, name);
 		return;
 	}
 
 	if (parc > 2 || SecretChannel(channel))
 	{
 		if (!IsMember(client, channel) && !IsServer(client)
 		    && !ValidatePermissionsForPath("channel:see:list:secret",client,NULL,channel,NULL) && !IsULine(client))
 		{
 			sendnumeric(client, ERR_NOTONCHANNEL, name);
 			return;
 		}
 		if (parc > 2)
 			topic = parv[2];
 	}
 
 	if (parc > 4)
 	{
 		if (MyUser(client))
 		{
 			sendnumeric(client, ERR_CANNOTDOCOMMAND, "TOPIC", "Invalid parameters. Usage is TOPIC #channel :topic here");
 			return;
 		}
 		tnick = parv[2];
 		ttime = atol(parv[3]);
 		topic = parv[4];
 	}
 
 	/* Only asking for the topic */
 	if (!topic)
 	{
 		if (IsServer(client))
 			return; /* Servers must maintain state, not ask */
 
 		for (h = Hooks[HOOKTYPE_VIEW_TOPIC_OUTSIDE_CHANNEL]; h; h = h->next)
 		{
 			i = (*(h->func.intfunc))(client,channel);
 			if (i != HOOK_CONTINUE)
 				break;
 		}
 
 		/* If you're not a member, and you can't view outside channel, deny */
 		if ((!IsMember(client, channel) && i == HOOK_DENY) ||
 		    (is_banned(client,channel,BANCHK_JOIN,NULL,NULL) &&
 		     !ValidatePermissionsForPath("channel:see:topic",client,NULL,channel,NULL)))
 		{
 			sendnumeric(client, ERR_NOTONCHANNEL, name);
 			return;
 		}
 
 		if (!channel->topic)
 			sendnumeric(client, RPL_NOTOPIC, channel->name);
 		else
 		{
 			sendnumeric(client, RPL_TOPIC, channel->name, channel->topic);
 			sendnumeric(client, RPL_TOPICWHOTIME, channel->name,
 			            channel->topic_nick, (long long)channel->topic_time);
 		}
 		return;
 	}
 
 	if (ttime && topic && (IsServer(client) || IsULine(client)))
 	{
 		if (!channel->topic_time || ttime > channel->topic_time || IsULine(client))
 		/* The IsUline is to allow services to use an old TS. Apparently
 		 * some services do this in their topic enforcement -- codemastr 
 		 */
 		{
 			/* Set the topic */
 			safe_strldup(channel->topic, topic, iConf.topic_length+1);
 			safe_strldup(channel->topic_nick, tnick, NICKLEN+USERLEN+HOSTLEN+5);
 			channel->topic_time = ttime;
 
 			new_message(client, recv_mtags, &mtags);
 			RunHook(HOOKTYPE_TOPIC, client, channel, mtags, topic);
 			sendto_server(client, 0, 0, mtags, ":%s TOPIC %s %s %lld :%s",
 			    client->id, channel->name, channel->topic_nick,
 			    (long long)channel->topic_time, channel->topic);
 			sendto_channel(channel, client, NULL, 0, 0, SEND_LOCAL, mtags,
 				       ":%s TOPIC %s :%s",
 				       client->name, channel->name, channel->topic);
 			free_message_tags(mtags);
 		}
 		return;
 	}
 
 	/* Topic change. Either locally (check permissions!) or remote, check permissions: */
 	if (IsUser(client))
 	{
 		const char *newtopic = NULL;
 		const char *errmsg = NULL;
 		int ret = EX_ALLOW;
 		int operoverride = 0;
 
 		for (h = Hooks[HOOKTYPE_CAN_SET_TOPIC]; h; h = h->next)
 		{
 			int n = (*(h->func.intfunc))(client, channel, topic, &errmsg);
 
 			if (n == EX_DENY)
 			{
 				ret = n;
 			} else
 			if (n == EX_ALWAYS_DENY)
 			{
 				ret = n;
 				break;
 			}
 		}
 
 		if (ret == EX_ALWAYS_DENY)
 		{
 			if (MyUser(client) && errmsg)
 				sendto_one(client, NULL, "%s", errmsg); /* send error, if any */
 
 			if (MyUser(client))
 				return; /* reject the topic set (note: we never block remote sets) */
 		}
 
 		if (ret == EX_DENY)
 		{
 			if (MyUser(client) && !ValidatePermissionsForPath("channel:override:topic", client, NULL, channel, NULL))
 			{
 				if (errmsg)
 					sendto_one(client, NULL, "%s", errmsg);
 				return; /* reject */
 			} else {
 				operoverride = 1; /* allow */
 			}
 		}
 
 		/* banned? */
 		newtopic = topic;
 		if (!check_channel_access(client, channel, "hoaq") && is_banned(client, channel, BANCHK_MSG, &newtopic, &errmsg))
 		{
 			char buf[512];
 
 			if (MyUser(client) && !ValidatePermissionsForPath("channel:override:topic", client, NULL, channel, NULL))
 			{
 				ircsnprintf(buf, sizeof(buf), "You cannot change the topic on %s while being banned", channel->name);
 				sendnumeric(client, ERR_CANNOTDOCOMMAND, "TOPIC",  buf);
 				return;
 			}
 			operoverride = 1;
 		}
 
 		if (MyUser(client) && newtopic)
 			topic = newtopic; /* process is_banned() changes of topic (eg: text replacement), but only for local clients */
 
 		if (operoverride)
 			topic_operoverride_msg(client, channel, topic);
 
 		/* For local users, run spamfilters and hooks.. */
 		if (MyUser(client))
 		{
 			Hook *tmphook;
 			int n;
 
 			if (match_spamfilter(client, topic, SPAMF_TOPIC, "TOPIC", channel->name, 0, NULL))
 				return;
 
 			for (tmphook = Hooks[HOOKTYPE_PRE_LOCAL_TOPIC]; tmphook; tmphook = tmphook->next) {
 				topic = (*(tmphook->func.stringfunc))(client, channel, topic);
 				if (!topic)
 					return;
 			}
 		}
 
 		/* At this point 'tnick' is set to client->name.
 		 * If set::topic-setter nick-user-host; is set
 		 * then we update it here to nick!user@host.
 		 */
 		if (iConf.topic_setter == SETTER_NICK_USER_HOST)
 			tnick = make_nick_user_host(client->name, client->user->username, GetHost(client));
 	}
 
 	_set_channel_topic(client, channel, recv_mtags, topic, tnick, ttime);
 }
 
 /** Set topic on a channel.
  * @param client	The client setting the topic
  * @param channel	The channel
  * @param recv_mtags	Message tags
  * @param topic		The new topic (TODO: this function does not support unsetting yet)
  * @param set_by	Who set the topic (can be NULL, means client->name)
  * @param set_at	When the topic was set (can be 0, means now)
  */
 void _set_channel_topic(Client *client, Channel *channel, MessageTag *recv_mtags, const char *topic, const char *set_by, time_t set_at)
 {
 	MessageTag *mtags = NULL;
 
 	/* Set default values when needed */
 	if (set_by == NULL)
 		set_by = client->name;
 	if (set_at == 0)
 		set_at = TStime();
 
 	/* Set the topic */
 	safe_strldup(channel->topic, topic, iConf.topic_length+1);
 	safe_strldup(channel->topic_nick, set_by, NICKLEN+USERLEN+HOSTLEN+5);
 	channel->topic_time = set_at;
 
 	/* And broadcast the change - locally and remote */
 	new_message(client, recv_mtags, &mtags);
 	RunHook(HOOKTYPE_TOPIC, client, channel, mtags, topic);
 	sendto_server(client, 0, 0, mtags, ":%s TOPIC %s %s %lld :%s",
 	    client->id, channel->name, channel->topic_nick,
 	    (long long)channel->topic_time, channel->topic);
 	sendto_channel(channel, client, NULL, 0, 0, SEND_LOCAL, mtags, ":%s TOPIC %s :%s", client->name, channel->name, channel->topic);
 	free_message_tags(mtags);
 }

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