#!/usr/bin/perl

#  This script loops through each overdue item, determines the fine,
#  and updates the total amount of fines due by each user.  It relies on
#  the existence of /tmp/fines, which is created by ???
# Doesnt really rely on it, it relys on being able to write to /tmp/
# It creates the fines file
#
#  This script is meant to be run nightly out of cron.

# Copyright 2000-2002 Katipo Communications
# Copyright 2011 PTFS-Europe Ltd
#
# 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 2 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

use strict;
use warnings;
use 5.010;

use C4::Context;
use C4::Overdues;
use Getopt::Long;
use Carp;
use File::Spec;

use Koha::Calendar;
use Koha::DateUtils;

my $help;
my $verbose;
my $output_dir;
my $log;

GetOptions(
    'h|help'    => \$help,
    'v|verbose' => \$verbose,
    'l|log'     => \$log,
    'o|out:s'   => \$output_dir,
);
my $usage = << 'ENDUSAGE';

This script calculates and charges overdue fines
to patron accounts.  If the Koha System Preference
'finesMode' is set to 'production', the fines are charged
to the patron accounts.  If set to 'test', the fines are
calculated but not applied.

This script has the following parameters :
    -h --help: this message
    -l --log: log the output to a file (optional if the -o parameter is given)
    -o --out:  ouput directory for logs (defaults to env or /tmp if !exist)
    -v --verbose

ENDUSAGE

if ($help) {
    print $usage;
    exit;
}

my @borrower_fields =
  qw(cardnumber categorycode surname firstname email phone address citystate);
my @item_fields  = qw(itemnumber barcode date_due);
my @other_fields = qw(type days_overdue fine);
my $libname      = C4::Context->preference('LibraryName');
my $control      = C4::Context->preference('CircControl');
my $mode         = C4::Context->preference('finesMode');
my $delim = "\t";    # ?  C4::Context->preference('delimiter') || "\t";

my %is_holiday;
my $today = DateTime->now( time_zone => C4::Context->tz() );
my $filename;
if ($log or $output_dir) {
    $filename = get_filename($output_dir);
}

my $fh;
if ($filename) {
    open $fh, '>>', $filename or croak "Cannot write file $filename: $!";
    print {$fh} join $delim, ( @borrower_fields, @item_fields, @other_fields );
    print {$fh} "\n";
}
my $counted = 0;
my $overdues = Getoverdues();
for my $overdue ( @{$overdues} ) {
    if ( !defined $overdue->{borrowernumber} ) {
        carp
"ERROR in Getoverdues : issues.borrowernumber IS NULL.  Repair 'issues' table now!  Skipping record.\n";
        next;
    }
    my $borrower = BorType( $overdue->{borrowernumber} );
    my $branchcode =
        ( $control eq 'ItemHomeLibrary' ) ? $overdue->{homebranch}
      : ( $control eq 'PatronLibrary' )   ? $borrower->{branchcode}
      :                                     $overdue->{branchcode};

# In final case, CircControl must be PickupLibrary. (branchcode comes from issues table here).
    if ( !exists $is_holiday{$branchcode} ) {
        $is_holiday{$branchcode} = set_holiday( $branchcode, $today );
    }

    my $datedue = dt_from_string( $overdue->{date_due} );
    if ( DateTime->compare( $datedue, $today ) == 1 ) {
        next;    # not overdue
    }
    ++$counted;

    my ( $amount, $type, $unitcounttotal ) =
      CalcFine( $overdue, $borrower->{categorycode},
        $branchcode, $datedue, $today );
    $type ||= q{};

    # Don't update the fine if today is a holiday.
    # This ensures that dropbox mode will remove the correct amount of fine.
    if ( $mode eq 'production' && !$is_holiday{$branchcode} ) {
        if ( $amount > 0 ) {
            UpdateFine(
                $overdue->{itemnumber},
                $overdue->{borrowernumber},
                $amount, $type, output_pref($datedue)
            );
        }
    }
    if ($filename) {
        my @cells;
        push @cells,
          map { defined $borrower->{$_} ? $borrower->{$_} : q{} }
          @borrower_fields;
        push @cells, map { $overdue->{$_} } @item_fields;
        push @cells, $type, $unitcounttotal, $amount;
        say {$fh} join $delim, @cells;
    }
}
if ($filename){
    close $fh;
}

if ($verbose) {
    my $overdue_items = @{$overdues};
    print <<"EOM";
Fines assessment -- $today
EOM
    if ($filename) {
        say "Saved to $filename";
    }
    print <<"EOM";
Number of Overdue Items:
     counted $overdue_items
    reported $counted

EOM
}

sub set_holiday {
    my ( $branch, $dt ) = @_;

    my $calendar = Koha::Calendar->new( branchcode => $branch );
    return $calendar->is_holiday($dt);
}

sub get_filename {
    my $directory = shift;
    if ( !$directory ) {
        $directory = File::Spec->tmpdir();
    }
    if ( !-d $directory ) {
        carp "Could not write to $directory ... does not exist!";
    }
    my $name = C4::Context->config('database');
    $name =~ s/\W//;
    $name .= join q{}, q{_}, $today->ymd(), '.log';
    $name = File::Spec->catfile( $directory, $name );
    if ($verbose && $log) {
        say "writing to $name";
    }
    return $name;
}