package C4::Log;

#package to deal with Logging Actions in DB


# Copyright 2000-2002 Katipo Communications
# Copyright 2011 MJ Ray and software.coop
#
# This file is part of Koha.
#
# Koha 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 3 of the License, or
# (at your option) any later version.
#
# Koha 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
# along with Koha; if not, see <http://www.gnu.org/licenses>.

use strict;
use warnings;

use Data::Dumper qw( Dumper );
use JSON qw( to_json );
use Scalar::Util qw( blessed );
use File::Basename qw( basename );

use C4::Context;
use Koha::Logger;
use Koha::ActionLogs;

use vars qw(@ISA @EXPORT);

BEGIN {
        require Exporter;
        @ISA = qw(Exporter);
        @EXPORT = qw(logaction cronlogaction);
}

=head1 NAME

C4::Log - Koha Log Facility functions

=head1 SYNOPSIS

  use C4::Log;

=head1 DESCRIPTION

The functions in this module perform various functions in order to log all the operations done on the Database, including deleting and undeleting books, adding/editing members, etc.

=head1 FUNCTIONS

=over 2

=item logaction

  &logaction($modulename, $actionname, $objectnumber, $infos, $interface);

Adds a record into action_logs table to report the different changes upon the database.
Each log entry includes the number of the user currently logged in.  For batch
jobs, which operate without authenticating a user and setting up a session, the user
number is set to 0, which is the same as the superlibrarian's number.

=cut

#'
sub logaction {
    my ($modulename, $actionname, $objectnumber, $infos, $interface)=@_;

    # Get ID of logged in user.  if called from a batch job,
    # no user session exists and C4::Context->userenv() returns
    # the scalar '0'.
    my $userenv = C4::Context->userenv();
    my $usernumber = (ref($userenv) eq 'HASH') ? $userenv->{'number'} : 0;
    $usernumber ||= 0;
    $interface //= C4::Context->interface;

    if( blessed($infos) && $infos->isa('Koha::Object') ) {
        $infos = $infos->get_from_storage if $infos->in_storage;
        local $Data::Dumper::Sortkeys = 1;

        if ( $infos->isa('Koha::Item') && $modulename eq 'CATALOGUING' && $actionname eq 'MODIFY' ) {
            $infos = "item " . Dumper( $infos->unblessed );
        } else {
            $infos = Dumper( $infos->unblessed );
        }
    }

    my $script = ( $interface eq 'cron' or $interface eq 'commandline' )
        ? basename($0)
        : undef;

    my @trace;
    my $depth = C4::Context->preference('ActionLogsTraceDepth') || 0;
    for ( my $i = 0 ; $i < $depth ; $i++ ) {
        my ( $package, $filename, $line, $subroutine ) = caller($i);
        last unless defined $line;
        push(
            @trace,
            {
                package    => $package,
                filename   => $filename,
                line       => $line,
                subroutine => $subroutine,
            }
        );
    }
    my $trace = @trace ? to_json( \@trace, { utf8 => 1, pretty => 0 } ) : undef;

    Koha::ActionLog->new(
        {
            timestamp => \'NOW()',
            user      => $usernumber,
            module    => $modulename,
            action    => $actionname,
            object    => $objectnumber,
            info      => $infos,
            interface => $interface,
            script    => $script,
            trace     => $trace,
        }
    )->store();

    my $logger = Koha::Logger->get(
        {
            interface => $interface,
            category  => "ActionLogs.$modulename.$actionname"
        }
    );
    $logger->debug(
        sub {
            "ACTION LOG: " . to_json(
                {
                    user   => $usernumber,
                    module => $modulename,
                    action => $actionname,
                    object => $objectnumber,
                    info   => $infos
                }
            );
        }
    );
}

=item cronlogaction

  &cronlogaction($infos);

Convenience routine to add a record into action_logs table from a cron job.
Logs the path and name of the calling script plus the information privided by param $infos.

=cut

#'
sub cronlogaction {
    my $params = shift;
    my $info = $params->{info};
    my $action = $params->{action};
    $action ||= "Run";
    my $loginfo = (caller(0))[1];
    $loginfo .= ' ' . $info if $info;
    logaction( 'CRONJOBS', $action, $$, $loginfo ) if C4::Context->preference('CronjobLog');
}

1;
__END__

=back

=head1 AUTHOR

Koha Development Team <http://koha-community.org/>

=cut