/*
 * ngIRCd -- The Next Generation IRC Daemon
 * Copyright (c)2001,2002 by Alexander Barton (alex@barton.de)
 *
 * 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 2 of the License, or
 * (at your option) any later version.
 * Please read the file COPYING, README and AUTHORS for more information.
 *
 * IRC channel commands
 */


#include "portab.h"

static char UNUSED id[] = "$Id: irc-channel.c,v 1.35.2.4 2007/07/31 18:54:30 alex Exp $";

#include "imp.h"
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "defines.h"
#include "conn.h"
#include "client.h"
#include "channel.h"
#include "lists.h"
#include "log.h"
#include "match.h"
#include "messages.h"
#include "parse.h"
#include "irc-info.h"
#include "irc-write.h"
#include "resolve.h"
#include "conf.h"

#include "exp.h"
#include "irc-channel.h"


GLOBAL bool
IRC_JOIN( CLIENT *Client, REQUEST *Req )
{
	char *channame, *channame_ptr, *key, *key_ptr, *flags, *topic, modes[8];
	bool is_new_chan, is_invited, is_banned;
	CLIENT *target;
	CHANNEL *chan;
	
	assert( Client != NULL );
	assert( Req != NULL );

	/* Bad number of arguments? */
	if (Req->argc < 1 || Req->argc > 2)
		return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
					  Client_ID(Client), Req->command);

	/* Who is the sender? */
	if( Client_Type( Client ) == CLIENT_SERVER ) target = Client_Search( Req->prefix );
	else target = Client;
	if( ! target ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );

	/* Are channel keys given? */
	if (Req->argc > 1) {
		key = Req->argv[1];
		key_ptr = strchr(key, ',');
		if (key_ptr) *key_ptr = '\0';
	}
	else
		key = key_ptr = NULL;

	channame = Req->argv[0];
	channame_ptr = strchr(channame, ',');
	if (channame_ptr) *channame_ptr = '\0';

	/* Channel-Namen durchgehen */
	while (channame)
	{
		chan = NULL; flags = NULL;

		/* wird der Channel neu angelegt? */
		if( Channel_Search( channame )) {
			is_new_chan = false;
		} else {
			if (Conf_PredefChannelsOnly) { /* this server does not allow creation of channels */
				IRC_WriteStrClient( Client, ERR_BANNEDFROMCHAN_MSG, Client_ID( Client ), channame );
				/* Try next name, if any */
				channame = strchr(channame, ',');
				continue;
			}
			is_new_chan = true;
		}

		/* Hat ein Server Channel-User-Modes uebergeben? */
		if( Client_Type( Client ) == CLIENT_SERVER )
		{
			/* Channel-Flags extrahieren */
			flags = strchr( channame, 0x7 );
			if( flags )
			{
				*flags = '\0';
				flags++;
			}
		}

		/* Local client? */
		if( Client_Type( Client ) == CLIENT_USER )
		{
			/* Test if the user has reached his maximum channel count */
			if(( Conf_MaxJoins > 0 ) && ( Channel_CountForUser( Client ) >= Conf_MaxJoins ))
				return IRC_WriteStrClient( Client, ERR_TOOMANYCHANNELS_MSG,
							Client_ID( Client ), channame );

			/* Existiert der Channel bereits, oder wird er im Moment neu erzeugt? */
			if( is_new_chan )
			{
				/* Erster User im Channel: Operator-Flag setzen */
				flags = "o";
			}
			else
			{
				/* Existierenden Channel suchen */
				chan = Channel_Search( channame );
				assert( chan != NULL );

				is_banned = Lists_Check(Channel_GetListBans(chan), target );
				is_invited = Lists_Check(Channel_GetListInvites(chan), target );

				/* Testen, ob Client gebanned ist */
				if(( is_banned == true) &&  ( is_invited == false ))
				{
					/* Client ist gebanned (und nicht invited): */
					IRC_WriteStrClient( Client, ERR_BANNEDFROMCHAN_MSG, Client_ID( Client ), channame );

					/* Try next name, if any */
					channame = strchr(channame, ',');
					continue;
				}

				/* Ist der Channel "invite-only"? */
				if(( strchr( Channel_Modes( chan ), 'i' )) && ( is_invited == false ))
				{
					/* Channel ist "invite-only" und Client wurde nicht invited: */
					IRC_WriteStrClient( Client, ERR_INVITEONLYCHAN_MSG, Client_ID( Client ), channame );

					/* Try next name, if any */
					channame = strchr(channame, ',');
					continue;
				}

				/* Is the channel protected by a key? */
				if(( strchr( Channel_Modes( chan ), 'k' )) && ( strcmp( Channel_Key( chan ), key ? key : "" ) != 0 ))
				{
					/* Bad channel key! */
					IRC_WriteStrClient( Client, ERR_BADCHANNELKEY_MSG, Client_ID( Client ), channame );

					/* Try next name, if any */
					channame = strchr(channame, ',');
					continue;
				}

				/* Are there already too many members? */
				if(( strchr( Channel_Modes( chan ), 'l' )) && ( Channel_MaxUsers( chan ) <= Channel_MemberCount( chan )))
				{
					/* Bad channel key! */
					IRC_WriteStrClient( Client, ERR_CHANNELISFULL_MSG, Client_ID( Client ), channame );

					/* Try next name, if any */
					channame = strchr(channame, ',');
					continue;
				}
			}
		}
		else
		{
			/* Remote server: we don't need to know whether the
			 * client is invited or not, but we have to make sure
			 * that the "one shot" entries (generated by INVITE
			 * commands) in this list become deleted when a user
			 * joins a channel this way. */
			chan = Channel_Search( channame );
			if( chan != NULL ) (void)Lists_Check(Channel_GetListInvites(chan), target);
		}

		/* Channel joinen (und ggf. anlegen) */
		if( ! Channel_Join( target, channame ))
		{
			/* naechsten Namen ermitteln */
			channame = strchr(channame, ',');
			continue;
		}
		if( ! chan ) chan = Channel_Search( channame );
		assert( chan != NULL );

		/* Modes setzen (wenn vorhanden) */
		while( flags && *flags )
		{
			Channel_UserModeAdd( chan, target, *flags );
			flags++;
		}

		/* Wenn persistenter Channel und IRC-Operator: zum Channel-OP machen */
		if(( strchr( Channel_Modes( chan ), 'P' )) && ( strchr( Client_Modes( target ), 'o' ))) Channel_UserModeAdd( chan, target, 'o' );

		/* Muessen Modes an andere Server gemeldet werden? */
		strlcpy( &modes[1], Channel_UserModes( chan, target ), sizeof( modes ) - 1 );
		if( modes[1] ) modes[0] = 0x7;
		else modes[0] = '\0';

		/* An andere Server weiterleiten */
		IRC_WriteStrServersPrefix( Client, target, "JOIN :%s%s", channame, modes );

		/* im Channel bekannt machen */
		IRC_WriteStrChannelPrefix( Client, chan, target, false, "JOIN :%s", channame );
		if( modes[1] )
		{
			/* Modes im Channel bekannt machen */
			IRC_WriteStrChannelPrefix( Client, chan, target, false, "MODE %s +%s %s", channame, &modes[1], Client_ID( target ));
		}

		if( Client_Type( Client ) == CLIENT_USER )
		{
			/* an Client bestaetigen */
			IRC_WriteStrClientPrefix( Client, target, "JOIN :%s", channame );

			/* Send topic to client, if any */
			topic = Channel_Topic(chan);
			if (*topic) {
				IRC_WriteStrClient(Client, RPL_TOPIC_MSG,
					Client_ID(Client), channame, topic);
#ifndef STRICT_RFC
				IRC_WriteStrClient(Client, RPL_TOPICSETBY_MSG,
					Client_ID(Client), channame,
					Channel_TopicWho(chan),
					Channel_TopicTime(chan));
#endif
			}

			/* Mitglieder an Client Melden */
			IRC_Send_NAMES( Client, chan );
			IRC_WriteStrClient( Client, RPL_ENDOFNAMES_MSG, Client_ID( Client ), Channel_Name( chan ));
		}

		/* next channel? */
		channame = channame_ptr;
		if (channame) {
			channame++;
			channame_ptr = strchr(channame, ',');
			if (channame_ptr) *channame_ptr = '\0';

			if (key_ptr) {
				key = ++key_ptr;
				key_ptr = strchr(key, ',');
				if (key_ptr) *key_ptr = '\0';
			}
		}
	}
	return CONNECTED;
} /* IRC_JOIN */


GLOBAL bool
IRC_PART( CLIENT *Client, REQUEST *Req )
{
	CLIENT *target;
	char *chan;

	assert( Client != NULL );
	assert( Req != NULL );

	/* Falsche Anzahl Parameter? */
	if(( Req->argc > 2 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );

	/* Wer ist der Absender? */
	if( Client_Type( Client ) == CLIENT_SERVER ) target = Client_Search( Req->prefix );
	else target = Client;
	if( ! target ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );

	/* Channel-Namen durchgehen */
	chan = strtok( Req->argv[0], "," );
	while( chan )
	{
		if( ! Channel_Part( target, Client, chan, Req->argc > 1 ? Req->argv[1] : Client_ID( target )))
		{
			/* naechsten Namen ermitteln */
			chan = strtok( NULL, "," );
			continue;
		}

		/* naechsten Namen ermitteln */
		chan = strtok( NULL, "," );
	}
	return CONNECTED;
} /* IRC_PART */


GLOBAL bool
IRC_TOPIC( CLIENT *Client, REQUEST *Req )
{
	CHANNEL *chan;
	CLIENT *from;
	char *topic;
	bool r;

	assert( Client != NULL );
	assert( Req != NULL );

	/* Falsche Anzahl Parameter? */
	if(( Req->argc < 1 ) || ( Req->argc > 2 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );

	if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
	else from = Client;
	if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );

	/* Welcher Channel? */
	chan = Channel_Search( Req->argv[0] );
	if( ! chan ) return IRC_WriteStrClient( from, ERR_NOSUCHCHANNEL_MSG, Client_ID( from ), Req->argv[0] );

	/* Ist der User Mitglied in dem Channel? */
	if( ! Channel_IsMemberOf( chan, from )) return IRC_WriteStrClient( from, ERR_NOTONCHANNEL_MSG, Client_ID( from ), Req->argv[0] );

	if( Req->argc == 1 )
	{
		/* Request actual topic */
		topic = Channel_Topic(chan);
		if (*topic) {
			r = IRC_WriteStrClient(from, RPL_TOPIC_MSG,
				Client_ID(Client), Channel_Name(chan), topic);
#ifndef STRICT_RFC
			r = IRC_WriteStrClient(from, RPL_TOPICSETBY_MSG,
				Client_ID(Client), Channel_Name(chan),
				Channel_TopicWho(chan),
				Channel_TopicTime(chan));
#endif
			return r;
		}
		else
			 return IRC_WriteStrClient(from, RPL_NOTOPIC_MSG,
					Client_ID(from), Channel_Name(chan));
	}

	if( strchr( Channel_Modes( chan ), 't' ))
	{
		/* Topic Lock. Ist der User ein Channel Operator? */
		if( ! strchr( Channel_UserModes( chan, from ), 'o' )) return IRC_WriteStrClient( from, ERR_CHANOPRIVSNEEDED_MSG, Client_ID( from ), Channel_Name( chan ));
	}

	/* Set new topic */
	Channel_SetTopic(chan, from, Req->argv[1]);
	Log(LOG_DEBUG, "User \"%s\" set topic on \"%s\": %s",
		Client_Mask(from), Channel_Name(chan),
		Req->argv[1][0] ? Req->argv[1] : "<none>");

	/* im Channel bekannt machen und an Server weiterleiten */
	IRC_WriteStrServersPrefix( Client, from, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
	IRC_WriteStrChannelPrefix( Client, chan, from, false, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );

	if( Client_Type( Client ) == CLIENT_USER ) return IRC_WriteStrClientPrefix( Client, Client, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
	else return CONNECTED;
} /* IRC_TOPIC */


/**
 * Handler for the IRC "LIST" command.
 * This implementation handles the local case as well as the forwarding of the
 * LIST command to other servers in the IRC network.
 */
GLOBAL bool
IRC_LIST( CLIENT *Client, REQUEST *Req )
{
	char *pattern;
	CHANNEL *chan;
	CLIENT *from, *target;

	assert( Client != NULL );
	assert( Req != NULL );

	/* Bad number of prameters? */
	if( Req->argc > 2 )
		return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
			Client_ID( Client ), Req->command );

	if( Req->argc > 0 )
		pattern = strtok( Req->argv[0], "," );
	else
		pattern = "*";

	/* Get sender from prefix, if any */
	if( Client_Type( Client ) == CLIENT_SERVER )
		from = Client_Search( Req->prefix );
	else
		from = Client;

	if( ! from )
		return IRC_WriteStrClient( Client, ERR_NOSUCHSERVER_MSG,
				Client_ID( Client ), Req->prefix );

	if( Req->argc == 2 )
	{
		/* Forward to other server? */
		target = Client_Search( Req->argv[1] );
		if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER ))
			return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG,
					Client_ID( Client ), Req->argv[1] );

		if( target != Client_ThisServer( ))
		{
			/* Target is indeed an other server, forward it! */
			return IRC_WriteStrClientPrefix( target, from,
					"LIST %s :%s", Client_ID( from ),
					Req->argv[1] );
		}
	}
	
	while( pattern )
	{
		/* Loop through all the channels */
		chan = Channel_First( );
		while( chan )
		{
			/* Check search pattern */
			if( Match( pattern, Channel_Name( chan )))
			{
				/* Gotcha! */
				if( ! strchr( Channel_Modes( chan ), 's' ) ||
				    Channel_IsMemberOf( chan, from ))
				{
					if( ! IRC_WriteStrClient( from,
					    RPL_LIST_MSG, Client_ID( from ),
					    Channel_Name( chan ),
					    Channel_MemberCount( chan ),
					    Channel_Topic( chan )))
						return DISCONNECTED;
				}
			}
			chan = Channel_Next( chan );
		}
		
		/* Get next name ... */
		if( Req->argc > 0 )
			pattern = strtok( NULL, "," );
		else
			pattern = NULL;
	}
	
	return IRC_WriteStrClient( from, RPL_LISTEND_MSG, Client_ID( from ));
} /* IRC_LIST */


GLOBAL bool
IRC_CHANINFO( CLIENT *Client, REQUEST *Req )
{
	char modes_add[COMMAND_LEN], l[16], *ptr;
	CLIENT *from;
	CHANNEL *chan;
	int arg_topic;

	assert( Client != NULL );
	assert( Req != NULL );

	/* Bad number of parameters? */
	if(( Req->argc < 2 ) || ( Req->argc == 4 ) || ( Req->argc > 5 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );

	/* Compatibility kludge */
	if( Req->argc == 5 ) arg_topic = 4;
	else if( Req->argc == 3 ) arg_topic = 2;
	else arg_topic = -1;

	/* Search origin */
	from = Client_Search( Req->prefix );
	if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );

	/* Search or create channel */
	chan = Channel_Search( Req->argv[0] );
	if( ! chan ) chan = Channel_Create( Req->argv[0] );
	if( ! chan ) return CONNECTED;

	if( Req->argv[1][0] == '+' )
	{
		ptr = Channel_Modes( chan );
		if( ! *ptr )
		{
			/* OK, this channel doesn't have modes jet, set the received ones: */
			Channel_SetModes( chan, &Req->argv[1][1] );

			if( Req->argc == 5 )
			{
				if( strchr( Channel_Modes( chan ), 'k' )) Channel_SetKey( chan, Req->argv[2] );
				if( strchr( Channel_Modes( chan ), 'l' )) Channel_SetMaxUsers( chan, atol( Req->argv[3] ));
			}
			else
			{
				/* Delete modes which we never want to inherit */
				Channel_ModeDel( chan, 'l' );
				Channel_ModeDel( chan, 'k' );
			}

			strcpy( modes_add, "" );
			ptr = Channel_Modes( chan );
			while( *ptr )
			{
				if( *ptr == 'l' )
				{
					snprintf( l, sizeof( l ), " %lu", Channel_MaxUsers( chan ));
					strlcat( modes_add, l, sizeof( modes_add ));
				}
				if( *ptr == 'k' )
				{
					strlcat( modes_add, " ", sizeof( modes_add ));
					strlcat( modes_add, Channel_Key( chan ), sizeof( modes_add ));
				}
	     			ptr++;
			}
			
			/* Inform members of this channel */
			IRC_WriteStrChannelPrefix( Client, chan, from, false, "MODE %s +%s%s", Req->argv[0], Channel_Modes( chan ), modes_add );
		}
	}
	else Log( LOG_WARNING, "CHANINFO: invalid MODE format ignored!" );

	if( arg_topic > 0 )
	{
		/* We got a topic */
		ptr = Channel_Topic( chan );
		if(( ! *ptr ) && ( Req->argv[arg_topic][0] ))
		{
			/* OK, there is no topic jet */
			Channel_SetTopic(chan, Client, Req->argv[arg_topic]);
			IRC_WriteStrChannelPrefix(Client, chan, from, false,
			     "TOPIC %s :%s", Req->argv[0], Channel_Topic(chan));
		}
	}

	/* Forward CHANINFO to other serevrs */
	if( Req->argc == 5 ) IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s %s %s :%s", Req->argv[0], Req->argv[1], Req->argv[2], Req->argv[3], Req->argv[4] );
	else if( Req->argc == 3 ) IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s :%s", Req->argv[0], Req->argv[1], Req->argv[2] );
	else IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s", Req->argv[0], Req->argv[1] );

	return CONNECTED;
} /* IRC_CHANINFO */


/* -eof- */