#!/usr/bin/perl

# This file is part of Koha.
#
# Copyright (C) 2007 LibLime
# Parts Copyright BSZ 2011
# Parts Copyright C & P Bibliography Services 2012
#
# 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 this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

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

use C4::Context;
use C4::ImportBatch;
use C4::Matcher;
use Getopt::Long;

$| = 1;

# command-line parameters
my $record_type = "biblio";
my $encoding = "";
my $authorities = 0;
my $match = 0;
my $add_items = 0;
my $input_file = "";
my $batch_comment = "";
my $want_help = 0;
my $no_replace ;
my $item_action = 'always_add';

my $result = GetOptions(
    'encoding:s'    => \$encoding,
    'file:s'        => \$input_file,
    'match|match-bibs:s'  => \$match,
    'add-items'     => \$add_items,
    'item-action:s' => \$item_action,
    'no-replace'    => \$no_replace,
    'comment:s'     => \$batch_comment,
    'authorities'   => \$authorities,
    'h|help'        => \$want_help
);

$record_type = 'auth' if ($authorities);

if ($encoding eq "") {
    $encoding = "utf8";
}

if (not $result or $input_file eq "" or $want_help) {
    print_usage();
    exit 0;
}

unless (-r $input_file) {
    die "$0: cannot open input file $input_file: $!\n";
}

my $dbh = C4::Context->dbh;
$dbh->{AutoCommit} = 0;
process_batch($input_file, $record_type, $match, $add_items, $batch_comment);
$dbh->commit();

exit 0;

sub process_batch {
    my ($input_file, $record_type, $match, $add_items, $batch_comment) = @_;

    open IN, "<$input_file" or die "$0: cannot open input file $input_file: $!\n";
    my $marc_records = "";
    $/ = "\035";
    my $num_input_records = 0;
    while (<IN>) {
        s/^\s+//;
        s/\s+$//;
        next unless $_; # skip if record has only whitespace, as might occur
                        # if file includes newlines between each MARC record
        $marc_records .= $_; # FIXME - this sort of string concatenation
                             # is probably rather inefficient
        $num_input_records++;
    }
    close IN;

    print "... staging MARC records -- please wait\n";
    my ($batch_id, $num_valid_records, $num_items, @import_errors) =
        BatchStageMarcRecords($record_type, $encoding, $marc_records, $input_file, undef, $batch_comment, '', $add_items, 0,
                              100, \&print_progress_and_commit);
    print "... finished staging MARC records\n";

    my $num_with_matches = 0;
    if ($match) {
        my $matcher = C4::Matcher->fetch($match) ;
        if (defined $matcher) {
            SetImportBatchMatcher($batch_id, $match);
        } elsif ($record_type eq 'biblio')  {
            $matcher = C4::Matcher->new($record_type);
            $matcher->add_simple_matchpoint('isbn', 1000, '020', 'a', -1, 0, '');
            $matcher->add_simple_required_check('245', 'a', -1, 0, '',
                                            '245', 'a', -1, 0, '');
        }
        # set default record overlay behavior
        SetImportBatchOverlayAction($batch_id, ($no_replace) ? 'ignore' : 'replace');
        SetImportBatchNoMatchAction($batch_id, 'create_new');
        SetImportBatchItemAction($batch_id, $item_action);
        print "... looking for matches with records already in database\n";
        $num_with_matches = BatchFindDuplicates($batch_id, $matcher, 10, 100, \&print_progress_and_commit);
        print "... finished looking for matches\n";
    }

    my $num_invalid_records = scalar(@import_errors);
    print <<_SUMMARY_;

MARC record staging report
------------------------------------
Input file:                 $input_file
Record type:                $record_type
Number of input records:    $num_input_records
Number of valid records:    $num_valid_records
Number of invalid records:  $num_invalid_records
_SUMMARY_
    if ($match) {
        print "Number of records matched:  $num_with_matches\n";
    } else {
        print "Incoming records not matched against existing records (--match option not supplied)\n";
    }
    if ($record_type eq 'biblio') {
        if ($add_items) {
            print "Number of items parsed:  $num_items\n";
        } else {
            print "No items parsed (--add-items option not supplied)\n";
        }
    }

    print "\n";
    print "Batch number assigned:  $batch_id\n";
    print "\n";
}

sub print_progress_and_commit {
    my $recs = shift;
    $dbh->commit();
    print "... processed $recs records\n";
}

sub print_usage {
    print <<_USAGE_;
$0: stage MARC file into reservoir.

Use this batch job to load a file of MARC bibliographic
(with optional item information) or authority records into
the Koha reservoir.

After running this program to stage your file, you can use
either the batch job commit_file.pl or the Koha
Tools option "Manage Staged MARC Records" to load the
records into the main Koha database.

Parameters:
    --file <file_name>      name of input MARC bib file
    --authorities           stage authority records instead of bibs
    --encoding <encoding>   encoding of MARC records, default is utf8.
                            Other possible options are: MARC-8,
                            ISO_5426, ISO_6937, ISO_8859-1, EUC-KR
    --match <match_id>      use this option to match records
                            in the file with records already in
                            the database for future overlay.
                            If <match_id> isn't defined, a default
                            MARC21 ISBN & title match rule will be applied
                            for bib imports.
    --add-items             use this option to specify that
                            item data is embedded in the MARC
                            bibs and should be parsed.
    --item-action           action to take if --add-items is specifed;
                            choices are 'always_add',
                            'add_only_for_matches', 'add_only_for_new',
                            'ignore', or 'replace'
    --no-replace            overlay action for record: default is to
                            replace extant with the imported record.
    --comment <comment>     optional comment to describe
                            the record batch; if the comment
                            has spaces in it, surround the
                            comment with quotation marks.
    --help or -h            show this message.
_USAGE_
}