#!/usr/bin/perl

# Copyright 2018 Theke Solutions
#
# 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>.

=head1 NAME

reconcile_balances.pl - cron script to reconcile patron's balances

=head1 SYNOPSIS

./reconcile_balances.pl

or, in crontab:
0 1 * * * reconcile_balances.pl

=head1 DESCRIPTION

This script loops through patrons with outstanding credits and proceeds
to reconcile their balances.

=head1 OPTIONS

=over 8

=item B<--help>

Prints a brief help message and exits.

=item B<--verbose>

Makes the process print information about the taken actions.

=back

=cut

use Modern::Perl;

use Getopt::Long;
use Pod::Usage;
use Try::Tiny;

BEGIN {
    # find Koha's Perl modules
    # test carefully before changing this
    use FindBin;
    eval { require "$FindBin::Bin/../kohalib.pl" };
}

use C4::Log;

use Koha::Account::Lines;
use Koha::Patrons;

my $help    = 0;
my $verbose = 0;

GetOptions(
    'help'    => \$help,
    'verbose' => \$verbose
) or pod2usage(2);

pod2usage(1) if $help;

cronlogaction();

my @patron_ids = map { $_->borrowernumber } Koha::Account::Lines->search(
        {
            amountoutstanding => { '<' => 0 }
        },
        {
            columns  => [ qw/borrowernumber/ ],
            distinct => 1,
        }
    );

my $patrons = Koha::Patrons->search({ borrowernumber => { -in => \@patron_ids } });

while (my $patron = $patrons->next) {

    my $account = $patron->account;
    my $total_outstanding_credit = $account->outstanding_credits->total_outstanding;
    my $total_outstanding_debit  = $account->outstanding_debits->total_outstanding;

    if ( $total_outstanding_credit < 0
         and $total_outstanding_debit > 0) {

        try {

            $account->reconcile_balance;

            print $patron->id . ": credit: $total_outstanding_credit " .
                                  "debit: $total_outstanding_debit " .
                                  "=> outstanding " .
                                  "credit: " . $account->outstanding_credits->total_outstanding .
                                 " debit: " .  $account->outstanding_debits->total_outstanding . "\n"
                if $verbose;
        }
        catch {
            print "Problem with patron " . $patron->borrowernumber . ": $_";
        };
    }
}

1;

__END__