# -*- Mode: perl; tab-width: 4; indent-tabs-mode: nil; -*-
################################
# XMLLogger Module             #
################################
# Original Author: Matt Jones
# National Center for Ecological Analysis and Synthesis (NCEAS)
# University of California Santa Barbara
#
# This package creates an XML log file of the messages sent to IRC channels
# which mozbot has joined.  The content that is logged can be selected using
# regular expression filters, although by default all messages are logged

package BotModules::XMLLogger;
use vars qw(@ISA);
@ISA = qw(BotModules);
1;

sub Help {
    my $self = shift;
    my ($event) = @_;
    my $help = {
        '' => 'This module keeps an XML log of channels.',
    };
    if ($self->isAdmin($event)) {
        $help->{''} .= ' It can be configured to only accept messages matching certain patterns. The \'acceptedPatterns\' module variable is a list of regular expressions to use when determining what to log. The \'blockedPatterns\' list is the opposite.';
        $help->{'rotatelogs'} = 'Creates a new log file for each channel and moves the old one to a date-stamped version, making sure that the XML is valid. Syntax: \'rotatelogs\'.';
    }
    return $help;
}

# RegisterConfig - Called when initialised, should call registerVariables
sub RegisterConfig {
    my $self = shift;
    $self->SUPER::RegisterConfig(@_);
    $self->registerVariables(
      # [ name, save?, settable? ]
        ['acceptedPatterns', 1, 1, ['']], # by default match everything
        ['blockedPatterns', 1, 1, []], # by default block nothing
    );
}

sub Told {
    my $self = shift;
    my ($event, $message) = @_;
    if ($self->isAdmin($event)) {
        if ($message =~ /^\s*rotate\s*logs?\s*$/osi) {
            $self->RotateLogs($event);
        } else {
            return $self->SUPER::Told(@_);
        }
    } else {
        return $self->SUPER::Told(@_);
    }
    return 0; # we've dealt with it, no need to do anything else.
}

sub Log {
    my $self = shift;
    my ($event) = @_;
    if (($event->{'firsttype'} eq 'Told') or
        ($event->{'firsttype'} eq 'Heard')) {
        $self->DoLog($event, 'msg');
    } elsif (($event->{'firsttype'} eq 'Felt') or
             ($event->{'firsttype'} eq 'Saw')) {
        $self->DoLog($event, 'emote');
    } elsif (($event->{'firsttype'} eq 'SpottedKick') or
             ($event->{'firsttype'} eq 'Kicked')) {
        $self->DoLog($event, 'kick');
    } elsif ($event->{'firsttype'} eq 'SpottedPart') {
        $self->DoLog($event, 'part');
    } elsif ($event->{'firsttype'} eq 'SpottedQuit') {
        $self->DoLog($event, 'quit');
    } elsif ($event->{'firsttype'} eq 'SpottedJoin') {
        $self->DoLog($event, 'join');
    } elsif ($event->{'firsttype'} eq 'SpottedNickChange') {
        $self->DoLog($event, 'nick');
    } elsif ($event->{'firsttype'} eq 'ModeChange') {
        $self->DoLog($event, 'mode');
    } elsif ($event->{'firsttype'} eq 'SpottedTopicChange') {
        $self->DoLog($event, 'topic');
    } # XXX should log notices
    return $self->SUPER::Log(@_);
}

sub DoLog {
    my $self = shift;
    my ($event, $messageType) = @_;
    if ($event->{'channel'} ne '') { # don't log private messages
        foreach my $pattern (@{$self->{'acceptedPatterns'}}) {
            my $regexp = $self->sanitizeRegexp($pattern);
            if (($regexp eq '') ||
                ($event->{'fulldata'} =~ /$regexp/s) ||
                ($event->{'from'} =~ /$regexp/s)) {
                # wohay, we have a candidate!
                # now check for possible blockers...
                unless ($self->isBlocked($event)) {
                    $self->WriteMessage($event->{'time'},
                                        $event->{'channel'},
                                        $event->{'from'},
                                        $event->{'fulldata'},
                                        $messageType);
                    return; # only store each message once, regardless of how many patterns it matches
                }
            }
        }
    }
}

sub isBlocked {
    my $self = shift;
    my ($event) = @_;
    foreach my $blockedPattern (@{$self->{'blockedPatterns'}}) {
        my $regexp = $self->sanitizeRegexp($blockedPattern);
        if ($event->{'data'} =~ /$regexp/s) {
            return 1;
        }
    }
    return 0;
}

sub WriteMessage {
    my $self = shift;
    my ($time, $channel, $from, $message, $messageType) = @_;
    # Open the log file and append the message
    $channel = $self->sanitiseChannelName($channel);
    my $logName = $self->getLogFilename("$channel.xml.part");
    if (open(LOG, ">>$logName")) {
        my $msgtime = $self->logdate($time);
        # sanitise the output
        $_ = $self->escapeXML($_) for ($messageType, $channel, $from, $msgtime, $message);
        print LOG "<$messageType channel=\"$channel\" nick=\"$from\" time=\"$msgtime\">$message</$messageType>\n";
        close(LOG);
    } else {
        $self->debug("Error logging, failed to open log $logName");
    }
}

sub RotateLogs {
    my $self = shift;
    my ($event) = @_;
    my $errors = 0;
    foreach my $channel (@{$self->{'channels'}}) {
        $self->debug("Rotating log for $channel...");
        # XXX could (optionally) output message to channel saying so
        $errors += $self->RotateLogFile($event, $channel);
    }
    $errors = $errors == 1 ? "$errors error" : "$errors errors";
    $self->say($event, "Finished rotating logs, $errors.");
}

sub RotateLogFile {
    my $self = shift;
    my ($event, $channel) = @_;

    # create new names
    $channel = $self->sanitiseChannelName($channel);
    my $time = $self->filedate($event->{'time'});
    my $partName = $self->getLogFilename("$channel.xml.part");
    my $finalName = $self->getLogFilename("$channel-$time.xml");

    # try to finalise file
    if (-e $finalName) {
        $self->debug("error rotating log for $channel, destination already existed");
        return 1; # report error
    } elsif (not (-e $partName and -s $partName)) {
        $self->debug("skipping $channel log rotation, log was empty");
        return 0; # not an error condition
    } elsif (open(FinalLog, ">$finalName")) {
        # opened new file, add the XML and copy the data over
        print FinalLog "<?xml version=\"1.0\"?>\n"; # XXX optional -- do we really want to add this?
        print FinalLog "<irclog>\n";
        open(PartLog, "<$partName"); # XXX error checking
        while (defined($_ = <PartLog>)) {
            print FinalLog;
        }
        close(PartLog);
        print FinalLog "</irclog>";
        close(FinalLog);
        unlink($partName); # delete the part log, ready for new data
    } else {
        $self->debug("error rotating log for $channel, failed to open $finalName");
        return 1; # doh, report error
    }
    return 0
}

# logdate: return nice looking date and time stamp
sub logdate {
    my $self = shift;
    my ($sec, $min, $hour, $mday, $mon, $year) = gmtime(shift or time());
    return sprintf("%d-%02d-%02dT%02d:%02d:%02dZ", $year + 1900, $mon + 1, $mday, $hour, $min, $sec);
}

# return a date and time stamp suitable for file names
sub filedate {
    my $self = shift;
    my ($sec, $min, $hour, $mday, $mon, $year) = gmtime(shift or time());
    return sprintf('%d%02d%02d-%02d%02d%02d', $year + 1900, $mon + 1, $mday, $hour, $min, $sec);
}

sub sanitiseChannelName {
    my $self = shift;
    my($channel) = @_;
    $channel =~ s/([^\#&+a-zA-Z0-9-])//gosi; # sanitize
    $channel =~ m/^(.*)$/os; # detaint
    return $1;
}

# escape XML characters as needed
sub escapeXML {
    my $self = shift;
    my ($string) = @_;
    $string =~ s/&/&amp;/gos;
    $string =~ s/'/&apos;/gos;
    $string =~ s/"/&quot;/gos;
    $string =~ s/</&lt;/gos;
    $string =~ s/>/&gt;/gos;
    return $string;
}