#!/usr/bin/perl
###########################################################
#                                                         #
# PostgreSQL IRC Info Bot                                 #
#                                                         #
# Copyright 2005-2006 by:                                 #
# Petr Jelinek, Devdas Bhagat, Steve Atkins, David Fetter #
# Andreas Scherbaum, Greg Sabino Mullane                  #
#                                                         #
# Released under BSD licence                              #
#                                                         #
###########################################################

###########
#         #
# Modules #
#         #
###########

use strict;
use warnings;
use DBI;
use POE;
use POE::Component::IRC;
use Getopt::Mixed "nextOption";
use FileHandle;
require("./config.pm");


###############
#             #
# Global Vars #
#             #
###############
my $irc_nick       = "pg_docbot_test";
my $irc_server     = "invalid.freenode.net:6667";
my $irc_name       = "PostgreSQL IRC infobot";
my $irc_pass       = "";
my @irc_channels   = qw(
     #postgresql
     #pg_docbot
     #postgresql-es
     #pgfoundry
     #postgresql-de
     #postgresql-br
     #foss.in
     #dbi-link
     #plparrot
     #postgresql-eu
     #arpug
     ##NoEnd
     #postgresql-pe
     #slony
     #skytools
     #sfpug
     #jdcon
     #writeable_cte
     #postgresqlfr
     #pgtestfest
     #pg_charlie_foxtrot
);



my @mute_nicks     = qw(rtfm_please pg_docbot_ads);

my $db_host        = "";
my $db_name        = "";
my $db_user        = "";
my $db_pass        = "";
my $db_port        = 5432;
my $db_schema      = "";
my $admin_commands = { 
    '?learn'  => \&do_learn,
    '?forget' => \&do_forget,
    '?config' => \&do_config
};
my $messagefile    = "messages.txt";
my $query_prefix   = '??';
my $url_pattern    = '(http|ftp|news|bt|https)://';

use vars qw($dbh $SQL $sth %sth $count);

my $pg_docbot      = qw(pg_docbot);
my $shutdown       = 0;

use constant DEBUG => 3;
use constant ERROR => 2;
use constant WARN  => 1;
use constant INFO  => 0;

## Maximum items found before we wrap our responses
my $MAXWRAP = 3;

## Allow "LIKE" searches via ???
my $LIKESEARCH = 0;

## Are searches case-sensitive?
my $CASESEARCH = 0;

## Can everyone perform all actions (if running on a private network)
my $EVERYONE_AUTHORIZED = 0;

## Lock the database (only needed if running more than one bot on the same database)
my $LOCK_DATABASE = 1;

my $loglevel = DEBUG;

my %loglevels = (
    3 => 'DEBUG',
    2 => 'ERROR',
    1 => 'WARN',
    0 => 'INFO',
);


# stores the last question possible to answer if the main bot does not know
%main::last_question = ();
%main::last_question_ts = ();
%main::last_question_nick = ();

# store messages printed for keywords
%main::messages = ();

###############################
# handle command line arguments
###############################
my $args_init_string = "help h d debug c=s config=s";
Getopt::Mixed::init($args_init_string);
my $help = 0;
my $debug = 0;
my $config_file = "";
# parse options
my ($argv_option, $argv_value, $argv_pretty);
while (($argv_option, $argv_value, $argv_pretty) = nextOption()) {
    if ($argv_option eq "h" or $argv_option eq "help") {
        $help = 1;
    }
    if ($argv_option eq "d" or $argv_option eq "debug") {
        $debug = 1;
    }
    if ($argv_option eq "c" or $argv_option eq "config") {
        $config_file = $argv_value;
    }
}
Getopt::Mixed::cleanup();

#############
# Config file
#############
my %cfg_directives = (
    'IRCNick',      \$irc_nick,
    'IRCServer',    \$irc_server,
    'IRCName',      \$irc_name,
    'IRCPass',      \$irc_pass,
    'IRCChannels',  \@irc_channels,
    'IRCMuteNicks', \@mute_nicks,
    'DBHost',       \$db_host,
    'DBName',       \$db_name,
    'DBUsername',   \$db_user,
    'DBPassword',   \$db_pass,
    'DBPort',       \$db_port,
    'DBSchema',     \$db_schema,
    'MessageFile',  \$messagefile
);

if (length($config_file) > 0) {
    read_config($config_file);
}

# for later use - we will need to know whats configured nick
# and whats our real nick
my $my_nick = $irc_nick;

# remove my own nick from mute_nicks
my @mute_nicks_tmp = ();
foreach (@mute_nicks) {
  if (lc($_) ne lc($irc_nick)) {
    push(@mute_nicks_tmp, $_);
  }
}
@mute_nicks = @mute_nicks_tmp;

## Make sure the database is up, might as well know now
is_db_ok();

################
# Signal handlers
################
$SIG{INT} = \&death;
$SIG{TERM} = \&death;
$SIG{KILL} = \&death;
$SIG{HUP} = \&reread_config;

################
# Logging
################
my $logfile = 'docbot.log';

# Fork and log to a file unless the debug command line argument is given, in
# which case log to STDOUT and don't fork.

close (STDIN);

if ($debug == 0) {
    if (!open (STDOUT, ">>$logfile")) {
      death ("Can't open logfile $logfile: $!\n");
    }
    if (!open (STDERR, ">>$logfile")) {
      death ("Can't open the logfile $logfile for STDERR: $!\n");
    }
    autoflush STDOUT 1;
    if (fork ()) {
        exit(0);
    }
}

################
# Functions
################


########
# read_config ( config_file )
####
# read config & set variables accordingly
#
sub read_config {
    my $config_file = shift;

    $main::config = docbot::config->new($config_file);
    $main::config->set_autosave("off");

    while (my ($key, $var) = each (%cfg_directives)) {
        my $val = $main::config->get_key($key);
        if (defined($val))
        {
            if (ref($var) eq 'ARRAY') {
                @$var = split /;/, $val;
            } else {
                $$var = $val;
            }
        }
    }

    read_messages($messagefile);
}


########
# reread_config ( )
####
# reread config and apply changes at runtime
# currently handles only changes in DB settings, irc channels and message files
#
sub reread_config {
    print_msg('Rereading config');
    $poe_kernel->post(pg_docbot => privmsg => '#pg_docbot', "reread config");
    
    my @old_irc_channels = @irc_channels;

    read_config($config_file);    

    foreach my $channel (@irc_channels) {
        @old_irc_channels = grep { lc($channel) ne lc($_) } @old_irc_channels;
        $poe_kernel->post(pg_docbot => 'join', $channel);
        $poe_kernel->post(pg_docbot => privmsg => '#pg_docbot', "join new channel: $channel");
    }

    if (scalar(@old_irc_channels)>0) {
        $poe_kernel->post(pg_docbot => 'part', @old_irc_channels);
        $poe_kernel->post(pg_docbot => privmsg => '#pg_docbot', "part old channel: @old_irc_channels");
    }

    if ($my_nick ne $irc_nick) {
        $my_nick = $irc_nick;
        $poe_kernel->post( $pg_docbot => nick => $my_nick);
        $poe_kernel->post(pg_docbot => privmsg => '#pg_docbot', "change nick to: $my_nick");
    }

    # remove my own nick from mute_nicks
    my @mute_nicks_tmp = ();
    foreach (@mute_nicks) {
      if (lc($_) ne lc($irc_nick)) {
        push(@mute_nicks_tmp, $_);
      }
    }
    @mute_nicks = @mute_nicks_tmp;

    read_messages($messagefile);
}


########
# print_msg ( message, [ detail_level ] )
####
# message handler
#
sub print_msg {
    my $msg = shift;
    my $level = shift || $loglevel;
    return if $level > $loglevel;
    my $timestamp = localtime;
    $msg =~ s/\n//g;
    print "$timestamp ";
    printf "%-8s", "[" . $loglevels{$level} . "]";
    print "- $msg\n";
    return 1;
}


sub word_wrap {
    my ($sep, $len, @text) = @_;
    $len -= length($sep);

    my @ret;
    my $line = '';
    
    foreach my $word (@text) {
        if (length($line.$word) > 250) {
            push (@ret, $line);
            $line = '';
        }
        $line .= (length($line) ? $sep : '').$word;
    }
    push (@ret, $line);

    return @ret;
}


########
# is_db_ok ( )
####
# handles db (re)connection, should be called before any sql commands
#
sub is_db_ok {
    my $DSN = "dbi:Pg:dbname=$db_name";
    if ($db_host) {
      $DSN .= ";host=$db_host";
    }
    if ($db_port) {
      $DSN .= ";port=$db_port";
    }

    $dbh = DBI->connect_cached(
        $DSN,
        $db_user,
        $db_pass,
        {
            "RaiseError" => 0,
            "PrintError" => 0,
            "AutoCommit" => 0
        }
    );

    unless ($dbh) {
        print_msg("Can't connect to database - $DBI::errstr\n", ERROR);
        return 0;
    }

    $dbh->{RaiseError} = 1;

    if ($db_schema) {
        $dbh->do("SET search_path = '$db_schema'");
        $dbh->commit();
    }

    return 1;
}


########
# get_answer ( query )
####
# search database for keywords
#
sub get_answer {
    my ($query,$like) = @_;

    $CASESEARCH or $query = lc $query;

    my @keys = split(/\s+/, $query);
    my $num = @keys;

    unless (is_db_ok()) {
        return \["Database error"];
    }

    my $searchnum = "search$num";
    $like and $searchnum .= "like";

    if (!exists $sth{$searchnum}) {
        my $INNERSEARCH = "SELECT kurl FROM docbot_key WHERE lower(key) = ?";
        $CASESEARCH and $INNERSEARCH =~ s/lower//;
        $LIKESEARCH and $like and $INNERSEARCH =~ y/=/~/;
        $SQL = "SELECT url FROM docbot_url WHERE id IN (\n";
        $SQL .= join "\n  INTERSECT\n" =>  map {"$INNERSEARCH\n"} @keys;
        $SQL .= ")";
        print_msg("Preparing $SQL\n", 9);
        $sth{$searchnum} = $dbh->prepare($SQL);
    }
    $sth{$searchnum}->execute(@keys);
    my $ret = $dbh->selectcol_arrayref($sth{$searchnum}, {Columns => [1]});
    return $ret;
}


########
# authorized ( {action, nick } )
####
# Check if a particular user is authorized to perform an action
#
sub authorized {

  my $arg = shift;
  if (ref $arg ne 'HASH') {
    die qq{Subroutine "authorized" must be passed a hashref\n};
  }

  ## Check for required arguments
  for my $req (qw(action nick)) {
    exists $arg->{$req} and length $arg->{$req}
      or die qq{Subroutine "authorized" required argument "$req" not found\n};
  }

  return "ok" if $EVERYONE_AUTHORIZED;

  $SQL = "SELECT 1 FROM docbot_user WHERE LOWER(u_nick) = ?";
  $sth = $dbh->prepare_cached($SQL);
  $count = $sth->execute(lc $arg->{nick});
  $sth->finish();

  return $count == 1 ? 1 : 0;

} ## end of authorized


########
# do_learn ( nick, query )
####
# auth user nick and save keyword(s) to database
#
sub do_learn {
    my ($kernel, $nick, $channel, $query) = @_;

    unless (is_db_ok()) {
        return "Database error";
    }

    ## Make sure the user is authorized to perform this action
    if (! &authorized({action => 'learn', nick => $nick, channel => $channel})) {
      print_msg("Unauthorized ?learn from $nick\n", WARN);
      $poe_kernel->post(pg_docbot => privmsg => '#pg_docbot', "user $nick not authorized to do a 'learn' in channel: $channel");
      $poe_kernel->post(pg_docbot => privmsg => '#pg_docbot', "learn query was: $query");
      return "You are not authorized";
    }

    $poe_kernel->post(pg_docbot => privmsg => '#pg_docbot', "learn ($nick/$channel): $query");
    my ($url, @keywords);
    my @keys = split(/\s+/, $query);

    # parse query
    foreach my $keyword (@keys) {
        if ($keyword =~ /^$url_pattern/) {
            $url = $keyword;
            # rewrite to current
            if ($url =~ /^(http:\/\/.*?postgresql\.org\/docs\/)[0-9\.]+(\/.*)$/i) {
                $url = $1 . "current" . $2;
            }
            # rewrite to static
            if ($url =~ /^(http:\/\/\/\/.*?postgresql\.org\/docs\/current\/)interactive(\/.*)$/i) {
                $url = $1 . "static" . $2;
            }
            last;
        }

        push(@keywords, lc($keyword));
    }

    if (@keywords == 0 || !defined($url)) {
        return "Bad parameters";
    }

    # start transaction
    $dbh->commit;
#    if (!$dbh->begin_work) {
#        print_msg("Database error: could not start transaction - $DBI::errstr\n", ERROR);
#        return "Database error: could not start transaction";
#    }

    # lock tables to avoid double inserts from two running bots
    if ($LOCK_DATABASE) {
      if (!$dbh->do("LOCK TABLE docbot_url, docbot_key IN ACCESS EXCLUSIVE MODE")) {
        print_msg("Database error: could not lock tables - $DBI::errstr\n", ERROR);
        $dbh->rollback;
        return "Database error: could not lock tables";
      }
    }

    # insert keywords
    $sth = $dbh->prepare("SELECT id FROM docbot_url WHERE url = ?");
    unless ($sth->execute($url)) {
        print_msg("Error inserting url - $DBI::errstr\n", ERROR);
        $dbh->rollback;
        return "Error inserting url";
    }

    my $kurl;

    if (($kurl) = $sth->fetchrow()) {
        $sth = $dbh->prepare("SELECT has_key (?, ?)");

        my $has_key;
        foreach my $keyword (@keywords) {
            unless ($sth->execute($kurl, $keyword) && (($has_key) = $sth->fetchrow())) {
                print_msg("Error inserting key - $DBI::errstr\n", ERROR);
                $dbh->rollback;
                return "Error while inserting key";
            }
            if ($has_key eq 't') {
                @keywords = grep( !/^$keyword$/i, @keywords );
            }
        }

        unless (@keywords) {
            $dbh->rollback;
            return "All keywords already exist in database";
        }
    } else {
        $sth = $dbh->prepare("INSERT INTO docbot_url (url) VALUES (?)");
        if (!$sth->execute($url)) {
            print_msg("Error inserting url - $DBI::errstr\n", ERROR);
            $dbh->rollback;
            return "Error while inserting url";
        }

        $sth = $dbh->prepare("SELECT currval(pg_get_serial_sequence('docbot_url', 'id'))");
        if (!$sth->execute()) {
            print_msg("Error while selecting currval after inserting url - $DBI::errstr\n", ERROR);
            $dbh->rollback;
            return "Error inserting key";
        }
        ($kurl) = $sth->fetchrow();
    }

    $sth = $dbh->prepare("INSERT INTO docbot_key (key, kurl) VALUES (?, ?)");

    foreach my $keyword (@keywords) {
        if (!$sth->execute($keyword, $kurl)) {
            print_msg("Error inserting key - $DBI::errstr\n", ERROR);
            $dbh->rollback;
            return "Error while inserting key";
        }
    }

    $dbh->commit;
    return "Successfully added "
          . scalar @keywords
          . ' keyword'
          . ((scalar(@keywords)==1)?'':'s')
          ;
}


########
# do_forget ( nick, query )
####
# auth user nick and remove keyword from database
#
sub do_forget {
    my ($kernel, $nick, $channel, $query) = @_;

    unless (is_db_ok()) {
        return "Database error";
    }

    ## Make sure the user is authorized to perform this action
    if (! &authorized({action => 'forget', nick => $nick, channel => $channel})) {
      print_msg("Unauthorized ?forget from $nick\n", WARN);
      $poe_kernel->post(pg_docbot => privmsg => '#pg_docbot', "user $nick not authorized to do a 'forget' in channel: $channel");
      $poe_kernel->post(pg_docbot => privmsg => '#pg_docbot', "forget query was: $query");
      return "You are not authorized";
    }

    $poe_kernel->post(pg_docbot => privmsg => '#pg_docbot', "forget ($nick/$channel): $query");
    my ($url, @keywords);
    my @keys = split(/\s+/, $query);

    if (($keys[0] !~ /$url_pattern/i) && ($keys[1] =~ /$url_pattern/i) && ($#keys >= 2)) {
        return "Usage: ?forget key url OR ?forget key key key OR ?forget URL URL URL";
        print_msg("Unauthorized ?forget from $nick\n", WARN);
        return qq{You are not authorized to run "?forget"};
    }

    my $rows = 0;

    if ($#keys == 1 && $keys[1] =~ /$url_pattern/) { # key url
      $sth = $dbh->prepare("DELETE FROM docbot_key WHERE key = ? AND kurl IN (SELECT id FROM docbot_url WHERE url = ?)");
      if ($sth->execute(@keys)) {
        $dbh->commit;
        return "Successfully deleted " . $sth->rows . " key" . (($sth->rows > 1) ? "s" : "") if ($sth->rows);
      }
      else {
        print_msg("Error deleting key(s) - $DBI::errstr\n", ERROR);
        return "Error while deleting key(s)";
      }
    }
    elsif ($keys[0] =~ /$url_pattern/) { # one or more urls
      $sth = $dbh->prepare("DELETE FROM docbot_url WHERE url =  ?");
      foreach my $keyword (@keys) {
        if ($keyword =~ /^$url_pattern/) {
          if ($sth->execute($keyword)) {
            $rows += $sth->rows;
          } else {
            $dbh->rollback;
            print_msg("Error deleting url - $DBI::errstr\n", ERROR);
            return "Error while deleting url";
          }
        }
      }
      $dbh->commit;
      return "Successfully deleted " . $rows . " url" . (($rows > 1) ? "s" : "") if ($rows);
      return "Url(s) not found";
    }
    else { # one or more keys, TODO delete urls with no keys left
      $sth = $dbh->prepare("DELETE FROM docbot_key WHERE key =  ?");
      foreach my $keyword (@keys) {
        if ($sth->execute($keyword)) {
          $rows += $sth->rows;
        }
        else {
          $dbh->rollback;
          print_msg("Error deleting key - $DBI::errstr\n", ERROR);
          return "Error while deleting key";
        }
      }
      $dbh->commit;
      return "Successfully deleted " . $rows . " key" . (($rows > 1) ? "s" : "") if ($rows);
      return "Key(s) not found";
    }
}


########
# do_config ( nick, query )
####
# config manipulation from IRC
#
sub do_config {
    my ($kernel, $nick, $channel, $query) = @_;

    print_msg('In do_config');
    
    unless (is_db_ok()) {
        return "Database error";
    }

    ## Make sure the user is authorized to perform this action
    if (! &authorized({action => 'config', nick => $nick, channel => $channel})) {
      print_msg("Unauthorized ?config from $nick\n", WARN);
      $poe_kernel->post(pg_docbot => privmsg => '#pg_docbot', "user $nick not authorized to do a 'config' in channel: $channel");
      $poe_kernel->post(pg_docbot => privmsg => '#pg_docbot', "config query was: $query");
      return "You are not authorized";
    }

    return "Configuration not supported on this bot" unless (defined($main::config));

    $poe_kernel->post(pg_docbot => privmsg => '#pg_docbot', "config ($nick/$channel): $query");
    my ($cmd, $var, $val) = split(/\s+/, $query);
    $cmd = lc($cmd);
    
    if (!defined($var) ||
        ($cmd ne "set" && $cmd ne "get") ||
        ($cmd eq "set" && !defined($val))) {
        return "Bad parameters";
    }
    
    return "Unknown variable '$var'" unless defined($cfg_directives{$var});

    if ($cmd eq "get") {
      if (ref($cfg_directives{$var}) eq 'ARRAY') {
        return $var." = ".join(';', @{$cfg_directives{$var}});
      }
      else {
        return $var." = ".${$cfg_directives{$var}};
      }
    }
    else {
      $main::config->set_key($var, $val);
      $main::config->save_config();
      reread_config();
      return "Successfully set config variable '$var'";
    }
}


########
# on_reconnect ( )
####
#
sub on_reconnect {
    $poe_kernel->delay( autoping => undef );
    $poe_kernel->delay( connect  => 60 );
}


########
# on_connect ( )
####
# called when conencted to irc, joins to selected channels
#
sub on_connect {
    my ( $kernel, $heap ) = @_[ KERNEL, HEAP ];

    print_msg("Connected ok, joining channels\n", 4);

    my %chan_data;
    foreach my $channel (@irc_channels) {
        $chan_data{$channel} = {};
        $kernel->post( $pg_docbot => join => $channel );
    }

    $heap->{chan_data} = \%chan_data;
    $heap->{seen_traffic} = 1;
    $kernel->delay( autoping => 300 );
}


########
# on_message ( )
####
# called when some message was sent to channel or to bot
#
sub on_message {
    my ( $kernel, $heap, $who, $where, $msg ) = @_[ KERNEL, HEAP, ARG0, ARG1, ARG2 ];
    my $nick = ( split /!/, $who )[0];
    my $channel = $where->[0];
    my $keep_silent = 0;
    my $do_it_anyway = 0;
    my $replyto = $channel;
    my $full_msg = $msg;
    my $like = 0;

    foreach my $do_channel (keys(%main::last_question)) {
        if (length($main::last_question{$do_channel}) > 0 && ($main::last_question_ts{$do_channel} + 20) < time()) {
            # delete any old stored question which is older than 20 seconds
            print_msg("deleting old question ($main::last_question{$do_channel})", DEBUG);
            $main::last_question{$do_channel} = "";
        }
    }

    # was this a reply from one of the bots and we have the question?
    if ($msg =~ /^nothing found/ && length($main::last_question{$channel}) > 0) {
        foreach my $mute_nick (@mute_nicks) {
            #look if one of the mute nicks told us that he does not know
            if (lc($mute_nick) eq lc($nick)) {
                # yes, push pack your question
                $nick = $main::last_question_nick{$channel};
                $msg = $main::last_question{$channel};
                print_msg("pushing back old question ($main::last_question{$channel})", DEBUG);
                $main::last_question{$channel} = "";
                $do_it_anyway = 1;
            }
        }
    }


    if ($msg =~ /^\s*(\?(?:learn|forget|config))\s+(.+)/i) {
        my ($com,$string) = ($1,$2);
        my $answer;

        if (!index($channel,'#') and $my_nick ne $irc_nick) {
            if (grep( /^$channel$/i, find_nick( $heap, $irc_nick ) )) {
                print_msg("Not processing admin command, master bot is on channel", DEBUG);
                return;
            }
        }

        if (!defined($heap->{whois_callback}->{$nick}->{authed})) {
            $heap->{whois_callback}->{$nick} = {event => (lc($channel) eq lc($my_nick)) ? 'irc_msg' : 'irc_public', authed => 0};
            @{$heap->{whois_callback}->{$nick}->{args}} = ($who, $where, $msg);

            $kernel->post( pg_docbot => whois => $nick );
            return;
        }
        elsif ($heap->{whois_callback}->{$nick}->{authed} != 1 and ! $EVERYONE_AUTHORIZED) {
            $answer = "You are not authorized";
        }
        else {
            # execute desired command
            $answer = $admin_commands->{$com}($kernel, $nick, $channel, $string);
        }
        undef ($heap->{whois_callback}->{$nick});

        if (length($answer)) {
            # if command was called in channel print answer to channel, if it was PM print it as PM
            if (lc($channel) eq lc($my_nick)) {
                $kernel->post(pg_docbot => privmsg => $nick, $answer);
            }
            else {
                $kernel->post(pg_docbot => privmsg => $channel, $answer);
            }
            return;
        }
    }
    elsif ($msg =~ /^\s*\?\?(\?*)(.+)/i) {
        $like = ($1 and $LIKESEARCH) ? 1 : 0;
        $msg = $2;
        $msg =~ s/^\s+//;

        if (substr($channel, 0, 1) eq '#')
        {
            if ($my_nick ne $irc_nick) {
                if (grep( /^$channel$/i, find_nick( $heap, $irc_nick ) )) {
                    print_msg("Not processing query command, master bot is on channel", DEBUG);
                    return;
                }
            }

            if ($do_it_anyway == 0) {
                foreach my $mnick (@mute_nicks) {
                    if (grep( /^$channel$/i, find_nick( $heap, $mnick ) )) {
                        print_msg("Not processing query command, bot with nickname $mnick is on channel", DEBUG);
                        #return;
                        # do not return, instead just continue and dont output anything
                        $keep_silent = 1;
                    }
                }
            }
        }

        if ($msg =~ /^(.+)\s+>\s+(\w+)/i) {
            return unless (grep( /^$channel$/i, find_nick( $heap, $2 ) ));
            $replyto = $2;
            $msg = $1;
        } elsif (lc($channel) eq lc($my_nick)) {
            $replyto = $nick;
        } else {
            $replyto = $channel;
        }
    }
    elsif ($msg =~ /^\s*$my_nick\W+tell\s+(\w+)\s+about\s+(.+)/i) {
        if ($1 eq "me") {
            $replyto = $nick;
        } elsif ($1 eq "us") {
            $replyto = $channel;
        } else {
            $replyto = $1;
            return unless (grep( /^$channel$/i, find_nick( $heap, $replyto ) ));
        }

        $msg = $2;
    } else {
        return;
    }
    # now decide if to keep silent
    if ($keep_silent == 1) {
      # yes, just store the question and a timestamp
      $main::last_question{$channel} = $full_msg;
      $main::last_question_ts{$channel} = time();
      $main::last_question_nick{$channel} = $nick;
      print_msg("storing old question ($main::last_question{$channel})", DEBUG);
      # now return
      return;
    }

    # get data from db
    my $answers = get_answer($msg, $like);
    my $message_to_say = get_message($msg);
    my $numanswers = @$answers;

    # print each answer as one line, except when there are more than $MAXWRAP
    if ($numanswers) {
        $kernel->post(pg_docbot => privmsg => $replyto, "For information about '$msg' see:\n");
        if ($numanswers <= $MAXWRAP) {
            for my $answer (@$answers) {
                $kernel->post(pg_docbot => privmsg => $replyto, $answer)
            }
        }
        else {
            for my $answer (word_wrap(' :: ', 250, @$answers)) {
                $kernel->post(pg_docbot => privmsg => $replyto, $answer);
            }
        }
    }
    else { # "nothing found," it always sends to the caller, not to the receiver
        # if command was called in channel print, answer to channel, if it was PM print it as PM
        if ($do_it_anyway == 0) {
            if (lc($channel) eq lc($my_nick)) {
                $kernel->post(pg_docbot => privmsg => $nick, "Nothing found");
            } else {
                $kernel->post(pg_docbot => privmsg => $channel, "Nothing found");
            }
        }
    }
}


########
# on_kick ( )
####
# called when somebody was kicked from channel
#
sub on_kick {
    my ( $kernel, $heap, $channel, $who ) = @_[ KERNEL, HEAP, ARG1, ARG2 ];

    my $nick = ( split /!/, $who )[0];

    # if we was kicked, we should rejoin
    if ( lc($nick) eq lc($my_nick) ) {
        remove_channel($heap, $channel);
        print_msg("I was kicked from channel ".$channel.", rejoining\n", 4);
        $poe_kernel->post(pg_docbot => privmsg => '#pg_docbot', "I was kicked from channel " . $channel . ", rejoining");
        $kernel->post( $pg_docbot => join => $channel );
    }
    else {
        remove_nick( $heap, $nick, $channel );
    }
}


sub on_join {
    my ( $kernel, $heap, $who, $channel ) = @_[ KERNEL, HEAP, ARG0, ARG1 ];
    my $nick = ( split /!/, $who )[0];

    add_nick( $heap, $nick, $channel );
}

sub on_quit {
    my ( $kernel, $heap, $who ) = @_[ KERNEL, HEAP, ARG0, ARG1 ];
    my $nick = ( split /!/, $who )[0];

    remove_nick( $heap, $nick );
}

sub on_part {
    my ( $kernel, $heap, $who, $channel ) = @_[ KERNEL, HEAP, ARG0, ARG1 ];
    $channel =~ s/^(.*?) :.*$/$1/;
    my $nick = ( split /!/, $who )[0];

    if (lc($nick) eq lc($my_nick)) {
        print_msg("Leaving $channel");
        remove_channel($heap, $channel);
    } else {
        remove_nick( $heap, $nick, $channel );
    }
}

sub on_nick {
    my ( $kernel, $heap, $who, $new ) = @_[ KERNEL, HEAP, ARG0, ARG1 ];
    my $nick = ( split /!/, $who )[0];

    my @channels = find_nick( $heap, $nick );

    foreach my $channel (@channels) {
        remove_nick( $heap, $nick, $channel );
        add_nick( $heap, $new, $channel );
    }
}

sub on_names {
    my ( $kernel, $heap, $server, $detail ) = @_[KERNEL, HEAP, ARG0, ARG1];
    my ( $channel, $nicknames ) = $detail =~ /^. (.*?) :(.*)$/;
    if ( !defined( $nicknames )) {
        print_msg ("Parse failed in on_names for $detail");
        return;
    }

    my @nicknames = split( /\s+/, $nicknames );
    for my $nick ( @nicknames ) {
        $nick =~ s/^@//;
        add_nick( $heap, $nick, $channel );
    }
}

########
# on_start ( )
####
# start bot
#
sub on_start {
    $poe_kernel->post( pg_docbot => register => "all" );

    my ($server, $port) = split(":", $irc_server);
    $poe_kernel->post( pg_docbot => connect =>
        {
            Debug     => $debug,
            Nick      => $my_nick,
            Username  => $irc_nick,
            Password  => $irc_pass,
            Ircname   => $irc_name,
            Server    => $server,
            Port      => $port
        }
    );
}

sub on_nickused {
    $my_nick .= '_';
    $poe_kernel->post( $pg_docbot => nick => $my_nick);
}

sub on_whois_identified {
    my ( $kernel, $heap, $detail ) = @_[KERNEL, HEAP, ARG1];
    my $nick = ( split / /, $detail )[0];

    if (defined($heap->{whois_callback}->{$nick})) {
        $heap->{whois_callback}->{$nick}->{authed} = 1;
    }
}

sub on_whois_end {
    my ( $kernel, $heap, $detail ) = @_[KERNEL, HEAP, ARG1];
    my $nick = ( split / /, $detail )[0];

    if (defined($heap->{whois_callback}->{$nick}->{event})) {
        $kernel->yield($heap->{whois_callback}->{$nick}->{event}, @{$heap->{whois_callback}->{$nick}->{args}});
    }
}

sub add_nick {
    my ( $heap, $who, $channel ) = @_;
    my %channels = %{$heap->{chan_data}};
    my @nicknames;

    @nicknames = @{$channels{$channel}->{names}}
        if (defined($channels{$channel}->{names}));
####################################################################
#                                                                  #
# The following avoids dealing with clever nicknames like ]X[X]X[  #
#                                                                  #
####################################################################
    return if grep{ lc($who) eq lc($_) } @nicknames;

    push(@nicknames, $who);
    $channels{$channel}->{names} = \@nicknames;

    $heap->{chan_data} = \%channels;
}


sub remove_nick {
    my ( $heap, $who, $channel ) = @_;
    my %channels = %{$heap->{chan_data}};

    if (defined($channel)) {
        if (defined($channels{$channel}->{names})) {
            my @nicknames;
            foreach my $nickname ( @{$channels{$channel}->{names}} ) {
                next if lc($who) eq lc($nickname);
                push @nicknames, $nickname;
            }
            $channels{$channel}->{names} = \@nicknames;
            $heap->{chan_data} = \%channels;
        }
    } else {
        foreach $channel ( keys %channels ) {
            if (defined($channels{$channel}->{names})) {
                my @nicknames;
                foreach my $nickname ( @{$channels{$channel}->{names}} ) {
                    next if lc($who) eq lc($nickname);
                    push @nicknames, $nickname;
                }
                $channels{$channel}->{names} = \@nicknames;
            }
        }
        $heap->{chan_data} = \%channels;
    }

    if ($who eq $irc_nick)
    {
        unless (find_nick($heap, $who)) {
            $my_nick = $irc_nick;
            $poe_kernel->post( $pg_docbot => nick => $my_nick);
        }
    }
}

sub remove_channel {
    my ( $heap, $channel ) = @_;
    my %channels = %{$heap->{chan_data}};

    if (defined($channels{$channel})) {
        undef($channels{$channel});
        $heap->{chan_data} = \%channels;
    }
}

sub find_nick {
    my ( $heap, $who ) = @_;
    my %channels = %{$heap->{chan_data}};
    my @channels;

    foreach my $channel ( keys %channels ) {
        if ( defined( $channels{$channel}->{names}) ) {
            if ( grep {lc($who) eq lc($_)} @{$channels{$channel}->{names}} ) {
                push (@channels, $channel);
            }
        }
    }

    return @channels;
}

sub on_disconnected {
    if ($shutdown == 1) {
        $poe_kernel->post ( $pg_docbot => unregister => "all" );
        $poe_kernel->post ( $pg_docbot => 'shutdown');
        print_msg ("Shutting down in on_disconnected");
        exit;
    } else {
        &on_reconnect;
    }
}

sub on_error {
    if ($shutdown == 1) {
        $poe_kernel->post ( $pg_docbot => unregister => "all" );
        $poe_kernel->post ( $pg_docbot => 'shutdown');
        print_msg ("Shutting down in on_error");
        exit;
    } else {
        &on_reconnect;
    }
}

sub death {
    my ($where) = $_[ ARG1 ];
    my $channel = $where->[0];
    my $text    = shift;
    if ($text =~ m/^(INT|TERM|KILL|HUP)$/) {
        $text = "Signal received: $text - shutting down";
    } else {
        $text = "Error: $text - shutting down";
    }
    $shutdown = 1;
    $poe_kernel->post ( $pg_docbot => quit => $text );
    print_msg ("Sending quit message: $text");
}

# http://poe.perl.org/?POE_Cookbook/IRC_Bot_Debugging
# http://poe.perl.org/?POE_Cookbook/IRC_Bot_Disconnecting
# http://poe.perl.org/?POE_Cookbook/IRC_Bot_Reconnecting
# http://poe.perl.org/?POE_Cookbook
# http://poe.perl.org/?Tutorials
# http://poe.perl.org/?POE_Support_Resources

sub _default {
    my ( $event, $args ) = @_[ ARG0 .. $#_ ];
    open(UNHANDLED, ">>", "unhandled.log") || return 0;
    print UNHANDLED "unhandled $event\n";

    my $print_it = 1;
    if ($event eq "autoping") {
      $print_it = 0;
    }
    if ($event eq "irc_ping") {
      $print_it = 0;
    }
    if ($event eq "irc_connected") {
      $print_it = 0;
    }
    if ($event eq "irc_snotice") {
      $print_it = 0;
    }
    if ($event eq "irc_whois") {
      $print_it = 0;
    }
    if ($event eq "irc_mode") {
      $print_it = 0;
    }
    if ($event eq "irc_topic") {
      $print_it = 0;
    }
    if ($event eq "irc_ctcp_action") {
      $print_it = 0;
    }
    if ($event eq "irc_notice") {
      if (@$args[0] =~ /^NickServ/) {
        $print_it = 0;
      }
      if (@$args[0] =~ /^ChanServ/) {
        $print_it = 0;
      }
    }
    if ($event eq "irc_ctcp_version") {
      if (@$args[0] =~ /^freenode\-connect/) {
        $print_it = 0;
      }
    }
    if ($event =~ /^irc_\d+/) {
      $print_it = 0;
    }
    if ($print_it == 1) {
      $poe_kernel->post(pg_docbot => privmsg => '#pg_docbot', "unhandled event: $event");
    }

    my $arg_number = 0;
    foreach (@$args) {
        print UNHANDLED "  ARG$arg_number = ";
        if ( ref($_) eq 'ARRAY' ) {
            print UNHANDLED "$_ = [", join ( ", ", @$_ ), "]\n";
            my $my_nick_quoted = quotemeta($my_nick);
            if ($print_it == 1 and @$_[0] !~ /$my_nick_quoted/i) {
              $poe_kernel->post(pg_docbot => privmsg => '#pg_docbot', "  $_ = [" . join ( ", ", @$_ ) . "]");
            }
        }
        else {
            print UNHANDLED  "'$_'\n";
            if ($print_it == 1 and length($_) > 0) {
              $poe_kernel->post(pg_docbot => privmsg => '#pg_docbot', "  '$_'");
            }
        }
        $arg_number++;
    }
    close(UNHANDLED);
    return 0;    # Don't handle signals.
}

sub read_messages {
  my $file = shift;

  # reset messages
  %main::messages = ();

  # check if the file exist
  if (length($file) < 1) {
    return;
  }
  if (!-f $file) {
    return;
  }

  # open file
  my $fh = new FileHandle;
  if (!open($fh, "<", $file)) {
    die("could not open existing message file ($file): $!\n");
  }
  my @file = <$fh>;
  close($fh);

  # now go through every line of the file and get messages
  foreach my $line (@file) {
    $line =~ s/[\r\n]//gs;
    if ($line =~ /^[\s]*\#/) {
      # skip comments
      next;
    }
    # validate if this is a key:value line
    if ($line =~ /^([^\s\:]+):[\s]*(.+)$/) {
      my $key = $1;
      my $value = $2;
      # do we already have an array for this key?
      if (!defined($main::messages{$key})) {
        $main::messages{$key} = [];
      }
      push(@{$main::messages{$key}}, $value);
    }
  }

}

sub get_message {
  my $msg = shift;

  if (!defined($msg)) {
    return '';
  }

  # key not found in message file
  if (!defined($main::messages{$msg})) {
    return '';
  }

  return '';

}

################
# Main
################

print_msg("Creating new IRC bot\n");

POE::Component::IRC->new($pg_docbot) or die "Failed to create pg_docbot $!";

print_msg("Starting IRC session\n");

POE::Session->create(
    inline_states => {
        _start           => \&on_start,
        _default         => \&_default,
        irc_error        => \&on_error,
        irc_disconnected => \&on_disconnected,
        irc_socketerr    => \&on_reconnect,
        irc_001          => \&on_connect,
        irc_433          => \&on_nickused,
        irc_353          => \&on_names,
        irc_join         => \&on_join,
        irc_part         => \&on_part,
        irc_quit         => \&on_quit,
        irc_nick         => \&on_nick,
        irc_330          => \&on_whois_identified,
        irc_318          => \&on_whois_end,
        irc_public       => \&on_message,
        irc_msg          => \&on_message,
    },
);


# Run the bot until it is done.
#POE::Kernel->run;
$poe_kernel->run;
exit 0;

# vi: ts=4