#!/usr/bin/perl

# This file is part of Koha.
#
# Copyright 2013 BibLibre
#
# 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

discharges.pl

=head1 DESCRIPTION

Allows librarian to edit and/or manage borrowers' discharges

=cut

use Modern::Perl;
use Carp qw( carp );

use CGI qw( -utf8 );
use C4::Auth qw( get_template_and_user );
use C4::Output qw( output_and_exit_if_error output_and_exit output_html_with_http_headers );
use C4::Members;
use C4::Reserves;
use C4::Letters;
use Koha::Patron::Discharge;
use Koha::Patrons;


my $input = CGI->new;

my ( $template, $loggedinuser, $cookie, $flags ) = get_template_and_user({
    template_name   => 'members/discharge.tt',
    query           => $input,
    type            => 'intranet',
    flagsrequired   => { 'borrowers' => 'edit_borrowers' },
});

my $borrowernumber = $input->param('borrowernumber');

unless ( C4::Context->preference('useDischarge') ) {
   print $input->redirect("/cgi-bin/koha/circ/circulation.pl?borrowernumber=$borrowernumber&nopermission=1");
   exit;
}

my $logged_in_user = Koha::Patrons->find( $loggedinuser );
my $patron = Koha::Patrons->find( $borrowernumber );
output_and_exit_if_error( $input, $cookie, $template, { module => 'members', logged_in_user => $logged_in_user, current_patron => $patron } );

my $can_be_discharged = Koha::Patron::Discharge::can_be_discharged({
    borrowernumber => $borrowernumber
});

# Generating discharge if needed
if ( $input->param('discharge') and $can_be_discharged ) {
    my $is_discharged = Koha::Patron::Discharge::is_discharged({
        borrowernumber => $borrowernumber,
    });
    unless ($is_discharged) {
        Koha::Patron::Discharge::discharge({
            borrowernumber => $borrowernumber
        });
    }
    eval {
        my $pdf_path = Koha::Patron::Discharge::generate_as_pdf(
            { borrowernumber => $borrowernumber, branchcode => $patron->branchcode } );

        binmode(STDOUT);
        print $input->header(
            -type       => 'application/pdf',
            -charset    => 'utf-8',
            -attachment => "discharge_$borrowernumber.pdf",
        );
        open my $fh, '<', $pdf_path;
        my @lines = <$fh>;
        close $fh;
        print @lines;
    };
    if ( $@ ) {
        carp $@;
        $template->param( messages => [ {type => 'error', code => 'unable_to_generate_pdf'} ] );
    } else {
        # no error, pdf is sent, so stop sending data to browser
        exit;
    }
}

# Already generated discharges
my @validated_discharges = Koha::Patron::Discharge::get_validated({
    borrowernumber => $borrowernumber,
});

$template->param(
    patron => $patron,
    can_be_discharged => $can_be_discharged,
    validated_discharges => \@validated_discharges,
);

$template->param( dischargeview => 1, );

output_html_with_http_headers $input, $cookie, $template->output;