# vim:syntax=perl
# vim:tabstop=4
# vim:shiftwidth=4
# vim:foldmethod=marker
# vim:foldenable
# vim:enc=utf-8
########################################################################################################
## WARNING!! BAD ENGLISH BELOW :P
##
## This script is designed for those who have been using muh irc bouncer.
## Basicly this script just monitors the proxy module and if new client
## connects it sets you automatically back from away state and when client
## disconnects it sets you automatically away if you arent allready away.
##
## Other hand if you dont use irssi-proxy you still have a good reason to
## use this if you want to forward messages that come to you while
## you are away to email box.
## This is usefull for forwarding messages to an SMS-gateway ;) 
##
## btw.. if you find any bugs or have any ideas for development of this
## script dont hesitate to send msg to BCOW@IrcNET
## or send email to anttip@n0-life.com
##
#### Version history:
# 0.1
#  * basic functionality
# 0.2b
#  * a patch from Wulf that gives a user ability to change the autoaway reason.
#  * Added away_level parameter that gives you ability to control how many 
#    clients there can be connected to the irssi_proxy module before you are 
#    set away.
#  * You arent set away when disconnecting from the irssi_proxy if you already
#    are away. This means that your current away reason isn't changed.
#  * Sends cumulated away messages back to the client when it connects to the 
#    irssi_proxy module.
# 0.2c
#  * Fixes bug where cummulated messages weren't sent.
#  * Code cleanup.
#  * Text wrapping to standart 80x24 text console.
#  * Added debug mode.
#  * Added script modes.
#  * Got rid of crappy irssi setings system.
#  * New logging expansion capability, either time or line based.
# 0.2d
#  * Micro fix to get back only when needed
#### To come / planned / wanted:
#  * Make expansion system log several channels at once.
#  * Make this script server based.
########################################################################################################

use strict;
use warnings;

# irssi imports
use Irssi;
use Irssi::Irc;
use vars qw($VERSION %IRSSI %config);

$VERSION = "0.2d";
%IRSSI = (
	authors => "BCOW",
	contact => "anttip\@n0-life.com",
	name => "awayproxy",
	description => "Sets nick away when client discconects from the "
		. "irssi-proxy. If away gathers messages targeted to nick and forwards "
		. "them to an email address.",
	license => "GPLv2",
	url => "http://www.n0-life.com",
);

# After how much seconds we can check if there are any messages to send?
$config{check_interval} = 45;
# this setting controls that when this amout of clients are connected to the 
# proxy module script sets you away. If you set this to 0 you are set away when
# no clients are connected to the proxy module. If you set this to lets say 5 
# then you will be set away allways when the amount of clients connected to the
# proxy module is 5 or under.
$config{away_level} = 0;
# Controls expansion mode. This mode records pub msgs that come after one with
# your nick in it. you can use line counting or time counting.
#  0 - off
#  line - line counting
#  time - time counting
$config{expansion_mode} = 'time';
# How many lines include after start line?
$config{expansion_lines} = 12;
# After how many seconds stop gathering msgs?
$config{expansion_timeout} = 90;
# script operation mode:
#  0 - to send messages both to email and when you get back to proxy
#  1 - only email
#  2 - only irc
#  3 - off
$config{script_mode} = 1;
# email address where to send the email
$config{emailto} = 'email@email.org';
# sendmail location
$config{sendmail} = '/usr/sbin/sendmail';
# who is the sender of the email
$config{emailfrom} = 'email@email.org';
# Subject of email
$config{emailsubject} = '[irssi-proxy]';
# and the awayreason setting (Thanx Wulf)
$config{awayreason} = 'Auto-away because client has disconnected from proxy.';
# Debugging mode
$config{debug} = 0;

# -- Don't change anything below this line if you don't know Perl. --
# number of clients connected
$config{clientcount} = 0;
# number of lines recorded
$config{expansion_lines_count} = 0;

$config{expansion_started} = 0;
# the small list and archive list
$config{awaymsglist} = [];
$config{awaymsglist2} = [];

if ( $config{script_mode} == 0 || $config{script_mode} == 1 ) { # {{{
	# timeouts for check loop
	debug('Timer on, timeout: ' . $config{check_interval});
	Irssi::timeout_add($config{check_interval} * 1000, 'msgsend_check', '');
} # }}}

sub debug { # {{{
	if ($config{debug}) {
		my $text = shift;
		my $caller = caller;
		Irssi::print('From ' . $caller . ":\n" . $text);
	}
} # }}}
sub msgsend_check { # {{{
	# If there are any messages to send
	my $count = @{$config{awaymsglist}};
	debug("Checking for messages: $count");
	# Check if we didn't grep msgs right now
	if ($count > 0 && !$config{expansion_started}) {
		# Concentate messages into one text.
		my $text = join "\n", @{$config{awaymsglist}};
		# Then empty list.
		$config{awaymsglist} = [];
		# Finally send email
		debug("Concentated msgs: $text");
		send_mail($text);
	}
} # }}}
sub send_mail { # {{{
	my $text = shift;
	debug("Sending mail");
	open MAIL, "|" . $config{sendmail} . " -t";
	print MAIL "To: $config{emailto}\n";
	print MAIL "From: $config{emailfrom}\n";
	print MAIL "Subject: $config{emailsubject}\n";
	print MAIL "$text";
	close MAIL;
} # }}}
sub client_connect { # {{{
	my (@servers) = Irssi::servers;
 
	$config{clientcount}++;
	debug("Client connected, current script mode: $config{script_mode}");

	# setback
	foreach my $server (@servers) {
		# if you're away on that server send yourself back
		if ($server->{usermode_away} == 1) {
			$server->send_raw('AWAY :');
			# and then send the current contents of archive list as notify's to 
			# your self ;)
			# .. weird huh? :)
			# This sends all the away messages to ALL the servers where you are 
			# connected... this is somewhat weird i know
			# but if someone wants to make a patch to this i would really 
			# appreciate it.
			if ($config{script_mode} == 0 || $config{script_mode} == 2) {
				debug('Sending notices');
				$server->send_raw('NOTICE ' . $server->{nick} . " :$_") 
					for @{$config{awaymsglist2}};
			}
		}
	}
	# and "clear" the awaymessage list
	$config{awaymsglist2} = [] 
		if $config{script_mode} == 0 || $config{script_mode} == 2;
} # }}}
sub client_disconnect { # {{{
	my (@servers) = Irssi::servers;
	debug('Client Disconnectted');

	$config{clientcount}-- unless $config{clientcount} == 0;

	# setaway
	if ($config{clientcount} <= $config{away_level}) {
		# ok.. we have the away_level of clients connected or less.
		foreach my $server (@servers) {
			if ($server->{usermode_away} == "0") {
				# we are not away on this server allready.. set the autoaway
				# reason
				$server->send_raw(
					'AWAY :' . $config{awayreason}
				);
			}
		}
	}
} # }}}
sub msg_pub { # {{{
	my ($server, $data, $nick, $mask, $target) = @_;
	 
	sub push_into_archive { # {{{
		my ($nick, $mask, $target, $data) = @_;
		# simple list that is emptied on the email run
		push @{$config{awaymsglist}}, "<$nick!$mask\@$target> $data" 
			if $config{script_mode} == 0 || $config{script_mode} == 1;
		# archive list that is emptied only on the client connect run
		push @{$config{awaymsglist2}}, "<$nick!$mask\@$target> $data" 
			if $config{script_mode} == 0 || $config{script_mode} == 2;
	} # }}}
	
	if ($config{expansion_started}) {
		if ($config{expansion_mode} eq 'line') {
			if ($config{expansion_lines_count} <= $config{expansion_lines} -1) {
				if ($config{expansion_chan} eq $target) {					
					debug("In effect from line expansion, pushing on. Cnt: "
						. $config{expansion_lines_count});
					push_into_archive($nick, $mask, $target, $data);
					$config{expansion_lines_count}++;
				}
			}
			else {
				debug("Line counter reached max, stopping expansion");
				$config{expansion_lines_count} = 0;
				$config{expansion_started} = 0;
				$config{expansion_chan} = '';
			}
		}
		elsif ($config{expansion_mode} eq 'time') {
			if ($config{expansion_chan} eq $target) {
				debug("Time expansion in effect, pushing on.");
				push_into_archive($nick, $mask, $target, $data);
			}
		}
	}
	elsif ($server->{usermode_away} == "1" && $data =~ /$server->{nick}/i) {
		debug("Got pub msg with my name");
		push_into_archive($nick, $mask, $target, $data);
		if ($config{expansion_mode}) {
			debug("Starting expansion in mode: " . $config{expansion_mode});
			$config{expansion_started} = 1;
			$config{expansion_chan} = $target;
			$config{expansion_time_out} = Irssi::timeout_add(
				$config{expansion_timeout} * 1000, 'expansion_stop', ''
			) if $config{expansion_mode} eq 'time';
		}
	}
} # }}}
sub expansion_stop { # {{{
	debug("Stopping expansion from timer");
	$config{expansion_started} = 0;
	$config{expansion_chan} = '';
} # }}}
sub msg_pri { # {{{
	my ($server, $data, $nick, $address) = @_;
	if ($server->{usermode_away} == "1") {
		debug("Got priv msg");
		# simple list that is emptied on the email run
		push @{$config{awaymsglist}}, "<$nick!$address> $data"
			if $config{script_mode} == 0 || $config{script_mode} == 1;
		# archive list that is emptied only on the client connect run
		push @{$config{awaymsglist2}}, "<$nick!$address> $data"
			if $config{script_mode} == 0 || $config{script_mode} == 2;
	}
} # }}}

Irssi::signal_add_last('proxy client connected', 'client_connect');
Irssi::signal_add_last('proxy client disconnected', 'client_disconnect');
Irssi::signal_add_last('message public', 'msg_pub');
Irssi::signal_add_last('message private', 'msg_pri');