/********************************************************************\
  * BitlBee -- An IRC to other IM-networks gateway                     *
  *                                                                    *
  * Copyright 2002-2010 Wilmer van der Gaast and others                *
  \********************************************************************/

/* User manager (root) commands                                         */

/*
  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.

  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 with
  the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
  if not, write to the Free Software Foundation, Inc., 59 Temple Place,
  Suite 330, Boston, MA  02111-1307  USA
*/

#define BITLBEE_CORE
#include "commands.h"
#include "bitlbee.h"
#include "help.h"
#include "ipc.h"

void root_command_string( irc_t *irc, char *command )
{
	root_command( irc, split_command_parts( command ) );
}

#define MIN_ARGS( x, y... )                                                    \
	do                                                                     \
	{                                                                      \
		int blaat;                                                     \
		for( blaat = 0; blaat <= x; blaat ++ )                         \
			if( cmd[blaat] == NULL )                               \
			{                                                      \
				irc_usermsg( irc, "Not enough parameters given (need %d).", x ); \
				return y;                                      \
			}                                                      \
	} while( 0 )

void root_command( irc_t *irc, char *cmd[] )
{	
	int i, len;
	
	if( !cmd[0] )
		return;
	
	len = strlen( cmd[0] );
	for( i = 0; root_commands[i].command; i++ )
		if( g_strncasecmp( root_commands[i].command, cmd[0], len ) == 0 )
		{
			if( root_commands[i+1].command &&
		            g_strncasecmp( root_commands[i+1].command, cmd[0], len ) == 0 )
		        	/* Only match on the first letters if the match is unique. */
		        	break;
		        
			MIN_ARGS( root_commands[i].required_parameters );
			
			root_commands[i].execute( irc, cmd );
			return;
		}
	
	irc_usermsg( irc, "Unknown command: %s. Please use \x02help commands\x02 to get a list of available commands.", cmd[0] );
}

static void cmd_help( irc_t *irc, char **cmd )
{
	char param[80];
	int i;
	char *s;
	
	memset( param, 0, sizeof(param) );
	for ( i = 1; (cmd[i] != NULL && ( strlen(param) < (sizeof(param)-1) ) ); i++ ) {
		if ( i != 1 )	// prepend space except for the first parameter
			strcat(param, " ");
		strncat( param, cmd[i], sizeof(param) - strlen(param) - 1 );
	}

	s = help_get( &(global.help), param );
	if( !s ) s = help_get( &(global.help), "" );
	
	if( s )
	{
		irc_usermsg( irc, "%s", s );
		g_free( s );
	}
	else
	{
		irc_usermsg( irc, "Error opening helpfile." );
	}
}

static void cmd_account( irc_t *irc, char **cmd );
static void bitlbee_whatsnew( irc_t *irc );

static void cmd_identify( irc_t *irc, char **cmd )
{
	storage_status_t status;
	gboolean load = TRUE;
	char *password = cmd[1];
	
	if( irc->status & USTATUS_IDENTIFIED )
	{
		irc_usermsg( irc, "You're already logged in." );
		return;
	}
	
	if( strncmp( cmd[1], "-no", 3 ) == 0 )
	{
		load = FALSE;
		password = cmd[2];
	}
	else if( strncmp( cmd[1], "-force", 6 ) == 0 )
	{
		password = cmd[2];
	}
	else if( irc->b->accounts != NULL )
	{
		irc_usermsg( irc,
		             "You're trying to identify yourself, but already have "
		             "at least one IM account set up. "
		             "Use \x02identify -noload\x02 or \x02identify -force\x02 "
		             "instead (see \x02help identify\x02)." );
		return;
	}
	
	if( password == NULL )
	{
		MIN_ARGS( 2 );
	}
	
	if( load )
		status = storage_load( irc, password );
	else
		status = storage_check_pass( irc->user->nick, password );
	
	switch (status) {
	case STORAGE_INVALID_PASSWORD:
		irc_usermsg( irc, "Incorrect password" );
		break;
	case STORAGE_NO_SUCH_USER:
		irc_usermsg( irc, "The nick is (probably) not registered" );
		break;
	case STORAGE_OK:
		irc_usermsg( irc, "Password accepted%s",
		             load ? ", settings and accounts loaded" : "" );
		irc_setpass( irc, password );
		irc->status |= USTATUS_IDENTIFIED;
		irc_umode_set( irc, "+R", 1 );
		
		bitlbee_whatsnew( irc );
		
		/* The following code is a bit hairy now. With takeover
		   support, we shouldn't immediately auto_connect in case
		   we're going to offer taking over an existing session.
		   Do it in 200ms since that should give the parent process
		   enough time to come back to us. */
		if( load )
		{
			irc_channel_auto_joins( irc, NULL );
			if( !set_getbool( &irc->default_channel->set, "auto_join" ) )
				irc_channel_del_user( irc->default_channel, irc->user,
				                      IRC_CDU_PART, "auto_join disabled "
				                      "for this channel." );
			if( set_getbool( &irc->b->set, "auto_connect" ) )
				irc->login_source_id = b_timeout_add( 200,
					cmd_identify_finish, irc );
		}
		
		/* If ipc_child_identify() returns FALSE, it means we're
		   already sure that there's no takeover target (only
		   possible in 1-process daemon mode). Start auto_connect
		   immediately. */
		if( !ipc_child_identify( irc ) && load &&
		    set_getbool( &irc->b->set, "auto_connect" ) )
			cmd_identify_finish( irc, 0, 0 );
		
		break;
	case STORAGE_OTHER_ERROR:
	default:
		irc_usermsg( irc, "Unknown error while loading configuration" );
		break;
	}
}

gboolean cmd_identify_finish( gpointer data, gint fd, b_input_condition cond )
{
	char *account_on[] = { "account", "on", NULL };
	irc_t *irc = data;
	
	cmd_account( irc, account_on );
	
	b_event_remove( irc->login_source_id );
	irc->login_source_id = -1;
	return FALSE;
}

static void cmd_register( irc_t *irc, char **cmd )
{
	char s[16];
	
	if( global.conf->authmode == AUTHMODE_REGISTERED )
	{
		irc_usermsg( irc, "This server does not allow registering new accounts" );
		return;
	}

	switch( storage_save( irc, cmd[1], FALSE ) ) {
		case STORAGE_ALREADY_EXISTS:
			irc_usermsg( irc, "Nick is already registered" );
			break;
			
		case STORAGE_OK:
			irc_usermsg( irc, "Account successfully created" );
			irc_setpass( irc, cmd[1] );
			irc->status |= USTATUS_IDENTIFIED;
			irc_umode_set( irc, "+R", 1 );
			
			/* Set this var now, or anyone who logs in to his/her
			   newly created account for the first time gets the
			   whatsnew story. */
			g_snprintf( s, sizeof( s ), "%d", BITLBEE_VERSION_CODE );
			set_setstr( &irc->b->set, "last_version", s );
			break;

		default:
			irc_usermsg( irc, "Error registering" );
			break;
	}
}

static void cmd_drop( irc_t *irc, char **cmd )
{
	storage_status_t status;
	
	status = storage_remove (irc->user->nick, cmd[1]);
	switch (status) {
	case STORAGE_NO_SUCH_USER:
		irc_usermsg( irc, "That account does not exist" );
		break;
	case STORAGE_INVALID_PASSWORD:
		irc_usermsg( irc, "Password invalid" );
		break;
	case STORAGE_OK:
		irc_setpass( irc, NULL );
		irc->status &= ~USTATUS_IDENTIFIED;
		irc_umode_set( irc, "-R", 1 );
		irc_usermsg( irc, "Account `%s' removed", irc->user->nick );
		break;
	default:
		irc_usermsg( irc, "Error: `%d'", status );
		break;
	}
}

static void cmd_save( irc_t *irc, char **cmd )
{
	if( ( irc->status & USTATUS_IDENTIFIED ) == 0 )
		irc_usermsg( irc, "Please create an account first" );
	else if( storage_save( irc, NULL, TRUE ) == STORAGE_OK )
		irc_usermsg( irc, "Configuration saved" );
	else
		irc_usermsg( irc, "Configuration could not be saved!" );
}

static void cmd_showset( irc_t *irc, set_t **head, char *key )
{
	set_t *set;
	char *val;
	
	if( ( val = set_getstr( head, key ) ) )
		irc_usermsg( irc, "%s = `%s'", key, val );
	else if( !( set = set_find( head, key ) ) )
	{
		irc_usermsg( irc, "Setting `%s' does not exist.", key );
		if( *head == irc->b->set )
			irc_usermsg( irc, "It might be an account or channel setting. "
			             "See \x02help account set\x02 and \x02help channel set\x02." );
	}
	else if( set->flags & SET_PASSWORD )
		irc_usermsg( irc, "%s = `********' (hidden)", key );
	else
		irc_usermsg( irc, "%s is empty", key );
}

typedef set_t** (*cmd_set_findhead)( irc_t*, char* );
typedef int (*cmd_set_checkflags)( irc_t*, set_t *set );

static int cmd_set_real( irc_t *irc, char **cmd, set_t **head, cmd_set_checkflags checkflags )
{
	char *set_name = NULL, *value = NULL;
	gboolean del = FALSE;
	
	if( cmd[1] && g_strncasecmp( cmd[1], "-del", 4 ) == 0 )
	{
		MIN_ARGS( 2, 0 );
		set_name = cmd[2];
		del = TRUE;
	}
	else
	{
		set_name = cmd[1];
		value = cmd[2];
	}
	
	if( set_name && ( value || del ) )
	{
		set_t *s = set_find( head, set_name );
		int st;
		
		if( s && checkflags && checkflags( irc, s ) == 0 )
			return 0;
		
		if( del )
			st = set_reset( head, set_name );
		else
			st = set_setstr( head, set_name, value );
		
		if( set_getstr( head, set_name ) == NULL &&
		    set_find( head, set_name ) )
		{
			/* This happens when changing the passwd, for example.
			   Showing these msgs instead gives slightly clearer
			   feedback. */
			if( st )
				irc_usermsg( irc, "Setting changed successfully" );
			else
				irc_usermsg( irc, "Failed to change setting" );
		}
		else
		{
			cmd_showset( irc, head, set_name );
		}
	}
	else if( set_name )
	{
		cmd_showset( irc, head, set_name );
	}
	else
	{
		set_t *s = *head;
		while( s )
		{
			if( !( s->flags & SET_HIDDEN ) )
				cmd_showset( irc, &s, s->key );
			s = s->next;
		}
	}
	
	return 1;
}

static int cmd_account_set_checkflags( irc_t *irc, set_t *s )
{
	account_t *a = s->data;
	
	if( a->ic && s && s->flags & ACC_SET_OFFLINE_ONLY )
	{
		irc_usermsg( irc, "This setting can only be changed when the account is %s-line", "off" );
		return 0;
	}
	else if( !a->ic && s && s->flags & ACC_SET_ONLINE_ONLY )
	{
		irc_usermsg( irc, "This setting can only be changed when the account is %s-line", "on" );
		return 0;
	}
	
	return 1;
}

static void cmd_account( irc_t *irc, char **cmd )
{
	account_t *a;
	int len;
	
	if( global.conf->authmode == AUTHMODE_REGISTERED && !( irc->status & USTATUS_IDENTIFIED ) )
	{
		irc_usermsg( irc, "This server only accepts registered users" );
		return;
	}
	
	len = strlen( cmd[1] );
	
	if( len >= 1 && g_strncasecmp( cmd[1], "add", len ) == 0 )
	{
		struct prpl *prpl;
		
		MIN_ARGS( 3 );
		
		if( cmd[4] == NULL )
			for( a = irc->b->accounts; a; a = a->next )
				if( strcmp( a->pass, PASSWORD_PENDING ) == 0 )
				{
					irc_usermsg( irc, "Enter password for account %s(%s) "
					             "first (use /OPER)", a->prpl->name, a->user );
					return;
				}
		
		prpl = find_protocol( cmd[2] );
		
		if( prpl == NULL )
		{
			irc_usermsg( irc, "Unknown protocol" );
			return;
		}
		
		for( a = irc->b->accounts; a; a = a->next )
			if( a->prpl == prpl && prpl->handle_cmp( a->user, cmd[3] ) == 0 )
				irc_usermsg( irc, "Warning: You already have an account with "
				             "protocol `%s' and username `%s'. Are you accidentally "
				             "trying to add it twice?", prpl->name, cmd[3] );
		
		a = account_add( irc->b, prpl, cmd[3], cmd[4] ? cmd[4] : PASSWORD_PENDING );
		if( cmd[5] )
		{
			irc_usermsg( irc, "Warning: Passing a servername/other flags to `account add' "
			                  "is now deprecated. Use `account set' instead." );
			set_setstr( &a->set, "server", cmd[5] );
		}
		
		irc_usermsg( irc, "Account successfully added%s", cmd[4] ? "" :
		             ", now use /OPER to enter the password" );
		
		return;
	}
	else if( len >= 1 && g_strncasecmp( cmd[1], "list", len ) == 0 )
	{
		int i = 0;
		
		if( strchr( irc->umode, 'b' ) )
			irc_usermsg( irc, "Account list:" );
		
		for( a = irc->b->accounts; a; a = a->next )
		{
			char *con;
			
			if( a->ic && ( a->ic->flags & OPT_LOGGED_IN ) )
				con = " (connected)";
			else if( a->ic )
				con = " (connecting)";
			else if( a->reconnect )
				con = " (awaiting reconnect)";
			else
				con = "";
			
			irc_usermsg( irc, "%2d (%s): %s, %s%s", i, a->tag, a->prpl->name, a->user, con );
			
			i ++;
		}
		irc_usermsg( irc, "End of account list" );
		
		return;
	}
	else if( cmd[2] )
	{
		/* Try the following two only if cmd[2] == NULL */
	}
	else if( len >= 2 && g_strncasecmp( cmd[1], "on", len ) == 0 )
	{
		if ( irc->b->accounts )
		{
			irc_usermsg( irc, "Trying to get all accounts connected..." );
		
			for( a = irc->b->accounts; a; a = a->next )
				if( !a->ic && a->auto_connect )
				{
					if( strcmp( a->pass, PASSWORD_PENDING ) == 0 )
						irc_usermsg( irc, "Enter password for account %s(%s) "
						             "first (use /OPER)", a->prpl->name, a->user );
					else
						account_on( irc->b, a );
				}
		} 
		else
		{
			irc_usermsg( irc, "No accounts known. Use `account add' to add one." );
		}
		
		return;
	}
	else if( len >= 2 && g_strncasecmp( cmd[1], "off", len ) == 0 )
	{
		irc_usermsg( irc, "Deactivating all active (re)connections..." );
		
		for( a = irc->b->accounts; a; a = a->next )
		{
			if( a->ic )
				account_off( irc->b, a );
			else if( a->reconnect )
				cancel_auto_reconnect( a );
		}
		
		return;
	}
	
	MIN_ARGS( 2 );
	len = strlen( cmd[2] );
	
	/* At least right now, don't accept on/off/set/del as account IDs even
	   if they're a proper match, since people not familiar with the new
	   syntax yet may get a confusing/nasty surprise. */
	if( g_strcasecmp( cmd[1], "on" ) == 0 ||
	    g_strcasecmp( cmd[1], "off" ) == 0 ||
	    g_strcasecmp( cmd[1], "set" ) == 0 ||
	    g_strcasecmp( cmd[1], "del" ) == 0 ||
	    ( a = account_get( irc->b, cmd[1] ) ) == NULL )
	{
		irc_usermsg( irc, "Could not find account `%s'. Note that the syntax "
		             "of the account command changed, see \x02help account\x02.", cmd[1] );
		
		return;
	}
	
	if( len >= 1 && g_strncasecmp( cmd[2], "del", len ) == 0 )
	{
		if( a->ic )
		{
			irc_usermsg( irc, "Account is still logged in, can't delete" );
		}
		else
		{
			account_del( irc->b, a );
			irc_usermsg( irc, "Account deleted" );
		}
	}
	else if( len >= 2 && g_strncasecmp( cmd[2], "on", len ) == 0 )
	{
		if( a->ic )
			irc_usermsg( irc, "Account already online" );
		else if( strcmp( a->pass, PASSWORD_PENDING ) == 0 )
			irc_usermsg( irc, "Enter password for account %s(%s) "
			             "first (use /OPER)", a->prpl->name, a->user );
		else
			account_on( irc->b, a );
	}
	else if( len >= 2 && g_strncasecmp( cmd[2], "off", len ) == 0 )
	{
		if( a->ic )
		{
			account_off( irc->b, a );
		}
		else if( a->reconnect )
		{
			cancel_auto_reconnect( a );
			irc_usermsg( irc, "Reconnect cancelled" );
		}
		else
		{
			irc_usermsg( irc, "Account already offline" );
		}
	}
	else if( len >= 1 && g_strncasecmp( cmd[2], "set", len ) == 0 )
	{
		cmd_set_real( irc, cmd + 2, &a->set, cmd_account_set_checkflags );
	}
	else
	{
		irc_usermsg( irc, "Unknown command: %s [...] %s. Please use \x02help commands\x02 to get a list of available commands.", "account", cmd[2] );
	}
}

static void cmd_channel( irc_t *irc, char **cmd )
{
	irc_channel_t *ic;
	int len;
	
	len = strlen( cmd[1] );
	
	if( len >= 1 && g_strncasecmp( cmd[1], "list", len ) == 0 )
	{
		GSList *l;
		int i = 0;
		
		if( strchr( irc->umode, 'b' ) )
			irc_usermsg( irc, "Channel list:" );
		
		for( l = irc->channels; l; l = l->next )
		{
			irc_channel_t *ic = l->data;
			
			irc_usermsg( irc, "%2d. %s, %s channel%s", i, ic->name,
			             set_getstr( &ic->set, "type" ),
			             ic->flags & IRC_CHANNEL_JOINED ? " (joined)" : "" );
			
			i ++;
		}
		irc_usermsg( irc, "End of channel list" );
		
		return;
	}
	
	if( ( ic = irc_channel_get( irc, cmd[1] ) ) == NULL )
	{
		/* If this doesn't match any channel, maybe this is the short
		   syntax (only works when used inside a channel). */
		if( ( ic = irc->root->last_channel ) &&
		    ( len = strlen( cmd[1] ) ) &&
		    g_strncasecmp( cmd[1], "set", len ) == 0 )
			cmd_set_real( irc, cmd + 1, &ic->set, NULL );
		else
			irc_usermsg( irc, "Could not find channel `%s'", cmd[1] );
		
		return;
	}
	
	MIN_ARGS( 2 );
	len = strlen( cmd[2] );
	
	if( len >= 1 && g_strncasecmp( cmd[2], "set", len ) == 0 )
	{
		cmd_set_real( irc, cmd + 2, &ic->set, NULL );
	}
	else if( len >= 1 && g_strncasecmp( cmd[2], "del", len ) == 0 )
	{
		if( !( ic->flags & IRC_CHANNEL_JOINED ) &&
		    ic != ic->irc->default_channel )
		{
			irc_usermsg( irc, "Channel %s deleted.", ic->name );
			irc_channel_free( ic );
		}
		else
			irc_usermsg( irc, "Couldn't remove channel (main channel %s or "
			                  "channels you're still in cannot be deleted).",
			                  irc->default_channel->name );
	}
	else
	{
		irc_usermsg( irc, "Unknown command: %s [...] %s. Please use \x02help commands\x02 to get a list of available commands.", "channel", cmd[1] );
	}
}

static void cmd_add( irc_t *irc, char **cmd )
{
	account_t *a;
	int add_on_server = 1;
	
	if( g_strcasecmp( cmd[1], "-tmp" ) == 0 )
	{
		MIN_ARGS( 3 );
		add_on_server = 0;
		cmd ++;
	}
	
	if( !( a = account_get( irc->b, cmd[1] ) ) )
	{
		irc_usermsg( irc, "Invalid account" );
		return;
	}
	else if( !( a->ic && ( a->ic->flags & OPT_LOGGED_IN ) ) )
	{
		irc_usermsg( irc, "That account is not on-line" );
		return;
	}
	
	if( cmd[3] )
	{
		if( !nick_ok( cmd[3] ) )
		{
			irc_usermsg( irc, "The requested nick `%s' is invalid", cmd[3] );
			return;
		}
		else if( irc_user_by_name( irc, cmd[3] ) )
		{
			irc_usermsg( irc, "The requested nick `%s' already exists", cmd[3] );
			return;
		}
		else
		{
			nick_set_raw( a, cmd[2], cmd[3] );
		}
	}
	
	if( add_on_server )
	{
		irc_channel_t *ic;
		char *s, *group = NULL;;
		
		if( ( ic = irc->root->last_channel ) &&
		    ( s = set_getstr( &ic->set, "fill_by" ) ) &&
		    strcmp( s, "group" ) == 0 &&
		    ( group = set_getstr( &ic->set, "group" ) ) )
			irc_usermsg( irc, "Adding `%s' to contact list (group %s)",
			             cmd[2], group );
		else
			irc_usermsg( irc, "Adding `%s' to contact list", cmd[2] );
		
		a->prpl->add_buddy( a->ic, cmd[2], group );
	}
	else
	{
		bee_user_t *bu;
		irc_user_t *iu;
		
		/* Only for add -tmp. For regular adds, this callback will
		   be called once the IM server confirms. */
		if( ( bu = bee_user_new( irc->b, a->ic, cmd[2], BEE_USER_LOCAL ) ) &&
		    ( iu = bu->ui_data ) )
			irc_usermsg( irc, "Temporarily assigned nickname `%s' "
			             "to contact `%s'", iu->nick, cmd[2] );
	}
	
}

static void cmd_remove( irc_t *irc, char **cmd )
{
	irc_user_t *iu;
	bee_user_t *bu;
	char *s;
	
	if( !( iu = irc_user_by_name( irc, cmd[1] ) ) || !( bu = iu->bu ) )
	{
		irc_usermsg( irc, "Buddy `%s' not found", cmd[1] );
		return;
	}
	s = g_strdup( bu->handle );
	
	bu->ic->acc->prpl->remove_buddy( bu->ic, bu->handle, NULL );
	nick_del( bu );
	if( g_slist_find( irc->users, iu ) )
		bee_user_free( irc->b, bu );
	
	irc_usermsg( irc, "Buddy `%s' (nick %s) removed from contact list", s, cmd[1] );
	g_free( s );
	
	return;
}

static void cmd_info( irc_t *irc, char **cmd )
{
	struct im_connection *ic;
	account_t *a;
	
	if( !cmd[2] )
	{
		irc_user_t *iu = irc_user_by_name( irc, cmd[1] );
		if( !iu || !iu->bu )
		{
			irc_usermsg( irc, "Nick `%s' does not exist", cmd[1] );
			return;
		}
		ic = iu->bu->ic;
		cmd[2] = iu->bu->handle;
	}
	else if( !( a = account_get( irc->b, cmd[1] ) ) )
	{
		irc_usermsg( irc, "Invalid account" );
		return;
	}
	else if( !( ( ic = a->ic ) && ( a->ic->flags & OPT_LOGGED_IN ) ) )
	{
		irc_usermsg( irc, "That account is not on-line" );
		return;
	}
	
	if( !ic->acc->prpl->get_info )
	{
		irc_usermsg( irc, "Command `%s' not supported by this protocol", cmd[0] );
	}
	else
	{
		ic->acc->prpl->get_info( ic, cmd[2] );
	}
}

static void cmd_rename( irc_t *irc, char **cmd )
{
	irc_user_t *iu, *old;
	gboolean del = g_strcasecmp( cmd[1], "-del" ) == 0;
	
	iu = irc_user_by_name( irc, cmd[del ? 2 : 1] );
	
	if( iu == NULL )
	{
		irc_usermsg( irc, "Nick `%s' does not exist", cmd[1] );
	}
	else if( del )
	{
		if( iu->bu )
			bee_irc_user_nick_reset( iu );
		irc_usermsg( irc, "Nickname reset to `%s'", iu->nick );
	}
	else if( iu == irc->user )
	{
		irc_usermsg( irc, "Use /nick to change your own nickname" );
	}
	else if( !nick_ok( cmd[2] ) )
	{
		irc_usermsg( irc, "Nick `%s' is invalid", cmd[2] );
	}
	else if( ( old = irc_user_by_name( irc, cmd[2] ) ) && old != iu )
	{
		irc_usermsg( irc, "Nick `%s' already exists", cmd[2] );
	}
	else
	{
		if( !irc_user_set_nick( iu, cmd[2] ) )
		{
			irc_usermsg( irc, "Error while changing nick" );
			return;
		}
		
		if( iu == irc->root )
		{
			/* If we're called internally (user did "set root_nick"),
			   let's not go O(INF). :-) */
			if( strcmp( cmd[0], "set_rename" ) != 0 )
				set_setstr( &irc->b->set, "root_nick", cmd[2] );
		}
		else if( iu->bu )
		{
			nick_set( iu->bu, cmd[2] );
		}
		
		irc_usermsg( irc, "Nick successfully changed" );
	}
}

char *set_eval_root_nick( set_t *set, char *new_nick )
{
	irc_t *irc = set->data;
	
	if( strcmp( irc->root->nick, new_nick ) != 0 )
	{
		char *cmd[] = { "set_rename", irc->root->nick, new_nick, NULL };
		
		cmd_rename( irc, cmd );
	}
	
	return strcmp( irc->root->nick, new_nick ) == 0 ? new_nick : SET_INVALID;
}

static void cmd_block( irc_t *irc, char **cmd )
{
	struct im_connection *ic;
	account_t *a;
	
	if( !cmd[2] && ( a = account_get( irc->b, cmd[1] ) ) && a->ic )
	{
		char *format;
		GSList *l;
		
		if( strchr( irc->umode, 'b' ) != NULL )
			format = "%s\t%s";
		else
			format = "%-32.32s  %-16.16s";
		
		irc_usermsg( irc, format, "Handle", "Nickname" );
		for( l = a->ic->deny; l; l = l->next )
		{
			bee_user_t *bu = bee_user_by_handle( irc->b, a->ic, l->data );
			irc_user_t *iu = bu ? bu->ui_data : NULL;
			irc_usermsg( irc, format, l->data, iu ? iu->nick : "(none)" );
		}
		irc_usermsg( irc, "End of list." );
		
		return;
	}
	else if( !cmd[2] )
	{
		irc_user_t *iu = irc_user_by_name( irc, cmd[1] );
		if( !iu || !iu->bu )
		{
			irc_usermsg( irc, "Nick `%s' does not exist", cmd[1] );
			return;
		}
		ic = iu->bu->ic;
		cmd[2] = iu->bu->handle;
	}
	else if( !( a = account_get( irc->b, cmd[1] ) ) )
	{
		irc_usermsg( irc, "Invalid account" );
		return;
	}
	else if( !( ( ic = a->ic ) && ( a->ic->flags & OPT_LOGGED_IN ) ) )
	{
		irc_usermsg( irc, "That account is not on-line" );
		return;
	}
	
	if( !ic->acc->prpl->add_deny || !ic->acc->prpl->rem_permit )
	{
		irc_usermsg( irc, "Command `%s' not supported by this protocol", cmd[0] );
	}
	else
	{
		imc_rem_allow( ic, cmd[2] );
		imc_add_block( ic, cmd[2] );
		irc_usermsg( irc, "Buddy `%s' moved from allow- to block-list", cmd[2] );
	}
}

static void cmd_allow( irc_t *irc, char **cmd )
{
	struct im_connection *ic;
	account_t *a;
	
	if( !cmd[2] && ( a = account_get( irc->b, cmd[1] ) ) && a->ic )
	{
		char *format;
		GSList *l;
		
		if( strchr( irc->umode, 'b' ) != NULL )
			format = "%s\t%s";
		else
			format = "%-32.32s  %-16.16s";
		
		irc_usermsg( irc, format, "Handle", "Nickname" );
		for( l = a->ic->permit; l; l = l->next )
		{
			bee_user_t *bu = bee_user_by_handle( irc->b, a->ic, l->data );
			irc_user_t *iu = bu ? bu->ui_data : NULL;
			irc_usermsg( irc, format, l->data, iu ? iu->nick : "(none)" );
		}
		irc_usermsg( irc, "End of list." );
		
		return;
	}
	else if( !cmd[2] )
	{
		irc_user_t *iu = irc_user_by_name( irc, cmd[1] );
		if( !iu || !iu->bu )
		{
			irc_usermsg( irc, "Nick `%s' does not exist", cmd[1] );
			return;
		}
		ic = iu->bu->ic;
		cmd[2] = iu->bu->handle;
	}
	else if( !( a = account_get( irc->b, cmd[1] ) ) )
	{
		irc_usermsg( irc, "Invalid account" );
		return;
	}
	else if( !( ( ic = a->ic ) && ( a->ic->flags & OPT_LOGGED_IN ) ) )
	{
		irc_usermsg( irc, "That account is not on-line" );
		return;
	}
	
	if( !ic->acc->prpl->rem_deny || !ic->acc->prpl->add_permit )
	{
		irc_usermsg( irc, "Command `%s' not supported by this protocol", cmd[0] );
	}
	else
	{
		imc_rem_block( ic, cmd[2] );
		imc_add_allow( ic, cmd[2] );
		
		irc_usermsg( irc, "Buddy `%s' moved from block- to allow-list", cmd[2] );
	}
}

static void cmd_yesno( irc_t *irc, char **cmd )
{
	query_t *q = NULL;
	int numq = 0;
	
	if( irc->queries == NULL )
	{
		/* Alright, alright, let's add a tiny easter egg here. */
		static irc_t *last_irc = NULL;
		static time_t last_time = 0;
		static int times = 0;
		static const char *msg[] = {
			"Oh yeah, that's right.",
			"Alright, alright. Now go back to work.",
			"Buuuuuuuuuuuuuuuurp... Excuse me!",
			"Yes?",
			"No?",
		};
		
		if( last_irc == irc && time( NULL ) - last_time < 15 )
		{
			if( ( ++times >= 3 ) )
			{
				irc_usermsg( irc, "%s", msg[rand()%(sizeof(msg)/sizeof(char*))] );
				last_irc = NULL;
				times = 0;
				return;
			}
		}
		else
		{
			last_time = time( NULL );
			last_irc = irc;
			times = 0;
		}
		
		irc_usermsg( irc, "Did I ask you something?" );
		return;
	}
	
	/* If there's an argument, the user seems to want to answer another question than the
	   first/last (depending on the query_order setting) one. */
	if( cmd[1] )
	{
		if( sscanf( cmd[1], "%d", &numq ) != 1 )
		{
			irc_usermsg( irc, "Invalid query number" );
			return;
		}
		
		for( q = irc->queries; q; q = q->next, numq -- )
			if( numq == 0 )
				break;
		
		if( !q )
		{
			irc_usermsg( irc, "Uhm, I never asked you something like that..." );
			return;
		}
	}
	
	if( g_strcasecmp( cmd[0], "yes" ) == 0 )
		query_answer( irc, q, 1 );
	else if( g_strcasecmp( cmd[0], "no" ) == 0 )
		query_answer( irc, q, 0 );
}

static void cmd_set( irc_t *irc, char **cmd )
{
	cmd_set_real( irc, cmd, &irc->b->set, NULL );
}

static void cmd_blist( irc_t *irc, char **cmd )
{
	int online = 0, away = 0, offline = 0;
	GSList *l;
	char s[256];
	char *format;
	int n_online = 0, n_away = 0, n_offline = 0;
	
	if( cmd[1] && g_strcasecmp( cmd[1], "all" ) == 0 )
		online = offline = away = 1;
	else if( cmd[1] && g_strcasecmp( cmd[1], "offline" ) == 0 )
		offline = 1;
	else if( cmd[1] && g_strcasecmp( cmd[1], "away" ) == 0 )
		away = 1;
	else if( cmd[1] && g_strcasecmp( cmd[1], "online" ) == 0 )
		online = 1;
	else
		online = away = 1;
	
	if( strchr( irc->umode, 'b' ) != NULL )
		format = "%s\t%s\t%s";
	else
		format = "%-16.16s  %-40.40s  %s";
	
	irc_usermsg( irc, format, "Nick", "Handle/Account", "Status" );
	
	if( irc->root->last_channel &&
	    strcmp( set_getstr( &irc->root->last_channel->set, "type" ), "control" ) != 0 )
		irc->root->last_channel = NULL;
	
	for( l = irc->users; l; l = l->next )
	{
		irc_user_t *iu = l->data;
		bee_user_t *bu = iu->bu;
		
		if( !bu || ( irc->root->last_channel && !irc_channel_wants_user( irc->root->last_channel, iu ) ) ||
		    ( bu->flags & ( BEE_USER_ONLINE | BEE_USER_AWAY ) ) != BEE_USER_ONLINE )
			continue;
		
		if( online == 1 )
		{
			char st[256] = "Online";
			
			if( bu->status_msg )
				g_snprintf( st, sizeof( st ) - 1, "Online (%s)", bu->status_msg );
			
			g_snprintf( s, sizeof( s ) - 1, "%s %s(%s)", bu->handle, bu->ic->acc->prpl->name, bu->ic->acc->user );
			irc_usermsg( irc, format, iu->nick, s, st );
		}
		
		n_online ++;
	}

	for( l = irc->users; l; l = l->next )
	{
		irc_user_t *iu = l->data;
		bee_user_t *bu = iu->bu;
		
		if( !bu || ( irc->root->last_channel && !irc_channel_wants_user( irc->root->last_channel, iu ) ) ||
		    !( bu->flags & BEE_USER_ONLINE ) || !( bu->flags & BEE_USER_AWAY ) )
			continue;
		
		if( away == 1 )
		{
			g_snprintf( s, sizeof( s ) - 1, "%s %s(%s)", bu->handle, bu->ic->acc->prpl->name, bu->ic->acc->user );
			irc_usermsg( irc, format, iu->nick, s, irc_user_get_away( iu ) );
		}
		n_away ++;
	}
	
	for( l = irc->users; l; l = l->next )
	{
		irc_user_t *iu = l->data;
		bee_user_t *bu = iu->bu;
		
		if( !bu || ( irc->root->last_channel && !irc_channel_wants_user( irc->root->last_channel, iu ) ) ||
		    bu->flags & BEE_USER_ONLINE )
			continue;
		
		if( offline == 1 )
		{
			g_snprintf( s, sizeof( s ) - 1, "%s %s(%s)", bu->handle, bu->ic->acc->prpl->name, bu->ic->acc->user );
			irc_usermsg( irc, format, iu->nick, s, "Offline" );
		}
		n_offline ++;
	}
	
	irc_usermsg( irc, "%d buddies (%d available, %d away, %d offline)", n_online + n_away + n_offline, n_online, n_away, n_offline );
}

static void cmd_qlist( irc_t *irc, char **cmd )
{
	query_t *q = irc->queries;
	int num;
	
	if( !q )
	{
		irc_usermsg( irc, "There are no pending questions." );
		return;
	}
	
	irc_usermsg( irc, "Pending queries:" );
	
	for( num = 0; q; q = q->next, num ++ )
		if( q->ic ) /* Not necessary yet, but it might come later */
			irc_usermsg( irc, "%d, %s(%s): %s", num, q->ic->acc->prpl->name, q->ic->acc->user, q->question );
		else
			irc_usermsg( irc, "%d, BitlBee: %s", num, q->question );
}

static void cmd_chat( irc_t *irc, char **cmd )
{
	account_t *acc;
	
	if( g_strcasecmp( cmd[1], "add" ) == 0 )
	{
		char *channel, *s;
		struct irc_channel *ic;
		
		MIN_ARGS( 3 );
		
		if( !( acc = account_get( irc->b, cmd[2] ) ) )
		{
			irc_usermsg( irc, "Invalid account" );
			return;
		}
		else if( !acc->prpl->chat_join )
		{
			irc_usermsg( irc, "Named chatrooms not supported on that account." );
			return;
		}
		
		if( cmd[4] == NULL )
		{
			channel = g_strdup( cmd[3] );
			if( ( s = strchr( channel, '@' ) ) )
				*s = 0;
		}
		else
		{
			channel = g_strdup( cmd[4] );
		}
		
		if( strchr( CTYPES, channel[0] ) == NULL )
		{
			s = g_strdup_printf( "#%s", channel );
			g_free( channel );
			channel = s;
			
			irc_channel_name_strip( channel );
		}
		
		if( ( ic = irc_channel_new( irc, channel ) ) &&
		    set_setstr( &ic->set, "type", "chat" ) &&
		    set_setstr( &ic->set, "chat_type", "room" ) &&
		    set_setstr( &ic->set, "account", cmd[2] ) &&
		    set_setstr( &ic->set, "room", cmd[3] ) )
		{
			irc_usermsg( irc, "Chatroom successfully added." );
		}
		else
		{
			if( ic )
				irc_channel_free( ic );
			
			irc_usermsg( irc, "Could not add chatroom." );
		}
		g_free( channel );
	}
	else if( g_strcasecmp( cmd[1], "with" ) == 0 )
	{
		irc_user_t *iu;
		
		MIN_ARGS( 2 );
		
		if( ( iu = irc_user_by_name( irc, cmd[2] ) ) &&
		    iu->bu && iu->bu->ic->acc->prpl->chat_with )
		{
			if( !iu->bu->ic->acc->prpl->chat_with( iu->bu->ic, iu->bu->handle ) )
			{
				irc_usermsg( irc, "(Possible) failure while trying to open "
				                  "a groupchat with %s.", iu->nick );
			}
		}
		else
		{
			irc_usermsg( irc, "Can't open a groupchat with %s.", cmd[2] );
		}
	}
	else if( g_strcasecmp( cmd[1], "list" ) == 0 ||
	         g_strcasecmp( cmd[1], "set" ) == 0 ||
	         g_strcasecmp( cmd[1], "del" ) == 0 )
	{
		irc_usermsg( irc, "Warning: The \002chat\002 command was mostly replaced with the \002channel\002 command." );
		cmd_channel( irc, cmd );
	}
	else
	{
		irc_usermsg( irc, "Unknown command: %s %s. Please use \x02help commands\x02 to get a list of available commands.", "chat", cmd[1] );
	}
}

static void cmd_group( irc_t *irc, char **cmd )
{
	GSList *l;
	int len;
	
	len = strlen( cmd[1] );
	if( g_strncasecmp( cmd[1], "list", len ) == 0 )
	{
		int n = 0;
		
		if( strchr( irc->umode, 'b' ) )
			irc_usermsg( irc, "Group list:" );
		
		for( l = irc->b->groups; l; l = l->next )
		{
			bee_group_t *bg = l->data;
			irc_usermsg( irc, "%d. %s", n ++, bg->name );
		}
		irc_usermsg( irc, "End of group list" );
	}
	else
	{
		irc_usermsg( irc, "Unknown command: %s %s. Please use \x02help commands\x02 to get a list of available commands.", "group", cmd[1] );
	}
}

static void cmd_transfer( irc_t *irc, char **cmd )
{
	GSList *files = irc->file_transfers;
	enum { LIST, REJECT, CANCEL };
	int subcmd = LIST;
	int fid;

	if( !files )
	{
		irc_usermsg( irc, "No pending transfers" );
		return;
	}

	if( cmd[1] && ( strcmp( cmd[1], "reject" ) == 0 ) )
	{
		subcmd = REJECT;
	}
	else if( cmd[1] && ( strcmp( cmd[1], "cancel" ) == 0 ) && 
		 cmd[2] && ( sscanf( cmd[2], "%d", &fid ) == 1 ) )
	{
		subcmd = CANCEL;
	}

	for( ; files; files = g_slist_next( files ) )
	{
		file_transfer_t *file = files->data;
		
		switch( subcmd ) {
		case LIST:
			if ( file->status == FT_STATUS_LISTENING )
				irc_usermsg( irc, 
					"Pending file(id %d): %s (Listening...)", file->local_id, file->file_name);
			else 
			{
				int kb_per_s = 0;
				time_t diff = time( NULL ) - file->started ? : 1;
				if ( ( file->started > 0 ) && ( file->bytes_transferred > 0 ) )
					kb_per_s = file->bytes_transferred / 1024 / diff;
					
				irc_usermsg( irc, 
					"Pending file(id %d): %s (%10zd/%zd kb, %d kb/s)", file->local_id, file->file_name, 
					file->bytes_transferred/1024, file->file_size/1024, kb_per_s);
			}
			break;
		case REJECT:
			if( file->status == FT_STATUS_LISTENING )
			{
				irc_usermsg( irc, "Rejecting file transfer for %s", file->file_name );
				imcb_file_canceled( file->ic, file, "Denied by user" );
			}
			break;
		case CANCEL:
			if( file->local_id == fid )
			{
				irc_usermsg( irc, "Canceling file transfer for %s", file->file_name );
				imcb_file_canceled( file->ic, file, "Canceled by user" );
			}
			break;
		}
	}
}

static void cmd_nick( irc_t *irc, char **cmd )
{
	irc_usermsg( irc, "This command is deprecated. Try: account %s set display_name", cmd[1] );
}

/* Maybe this should be a stand-alone command as well? */
static void bitlbee_whatsnew( irc_t *irc )
{
	int last = set_getint( &irc->b->set, "last_version" );
	char s[16], *msg;
	
	if( last >= BITLBEE_VERSION_CODE )
		return;
	
	msg = help_get_whatsnew( &(global.help), last );
	
	if( msg )
		irc_usermsg( irc, "%s: This seems to be your first time using this "
		                  "this version of BitlBee. Here's a list of new "
		                  "features you may like to know about:\n\n%s\n",
		                  irc->user->nick, msg );
	
	g_free( msg );
	
	g_snprintf( s, sizeof( s ), "%d", BITLBEE_VERSION_CODE );
	set_setstr( &irc->b->set, "last_version", s );
}

/* IMPORTANT: Keep this list sorted! The short command logic needs that. */
command_t root_commands[] = {
	{ "account",        1, cmd_account,        0 },
	{ "add",            2, cmd_add,            0 },
	{ "allow",          1, cmd_allow,          0 },
	{ "blist",          0, cmd_blist,          0 },
	{ "block",          1, cmd_block,          0 },
	{ "channel",        1, cmd_channel,        0 },
	{ "chat",           1, cmd_chat,           0 },
	{ "drop",           1, cmd_drop,           0 },
	{ "ft",             0, cmd_transfer,       0 },
	{ "group",          1, cmd_group,          0 },
	{ "help",           0, cmd_help,           0 }, 
	{ "identify",       1, cmd_identify,       0 },
	{ "info",           1, cmd_info,           0 },
	{ "nick",           1, cmd_nick,           0 },
	{ "no",             0, cmd_yesno,          0 },
	{ "qlist",          0, cmd_qlist,          0 },
	{ "register",       1, cmd_register,       0 },
	{ "remove",         1, cmd_remove,         0 },
	{ "rename",         2, cmd_rename,         0 },
	{ "save",           0, cmd_save,           0 },
	{ "set",            0, cmd_set,            0 },
	{ "transfer",       0, cmd_transfer,       0 },
	{ "yes",            0, cmd_yesno,          0 },
	/* Not expecting too many plugins adding root commands so just make a
	   dumb array with some empty entried at the end. */
	{ NULL },
	{ NULL },
	{ NULL },
	{ NULL },
	{ NULL },
	{ NULL },
	{ NULL },
	{ NULL },
	{ NULL },
};
static const int num_root_commands = sizeof( root_commands ) / sizeof( command_t );

gboolean root_command_add( const char *command, int params, void (*func)(irc_t *, char **args), int flags )
{
	int i;
	
	if( root_commands[num_root_commands-2].command )
		/* Planning fail! List is full. */
		return FALSE;
	
	for( i = 0; root_commands[i].command; i++ )
	{
		if( g_strcasecmp( root_commands[i].command, command ) == 0 )
			return FALSE;
		else if( g_strcasecmp( root_commands[i].command, command ) > 0 )
			break;
	}
	memmove( root_commands + i + 1, root_commands + i,
	         sizeof( command_t ) * ( num_root_commands - i - 1 ) );
	
	root_commands[i].command = g_strdup( command );
	root_commands[i].required_parameters = params;
	root_commands[i].execute = func;
	root_commands[i].flags = flags;
	
	return TRUE;
}