#!/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 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 Modern::Perl;

use Koha::Script;
use C4::Context;
use C4::ImportBatch qw( RecordsFromISO2709File RecordsFromMARCXMLFile BatchStageMarcRecords SetImportBatchMatcher SetImportBatchOverlayAction SetImportBatchNoMatchAction SetImportBatchItemAction BatchFindDuplicates );
use C4::Matcher;
use C4::MarcModificationTemplates qw( GetModificationTemplates );
use Getopt::Long qw( GetOptions );

$| = 1;

# command-line parameters
my $record_type = "biblio";
my $encoding = "UTF-8";
my $authorities = 0;
my $match = 0;
my $add_items = 0;
my $input_file = "";
my $batch_comment = "";
my $want_help = 0;
my $no_replace;
my $format = 'ISO2709';
my $no_create;
my $item_action = 'always_add';
my $marc_mod_template = '';
my $marc_mod_template_id = undef;

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

if($marc_mod_template ne '') {
   my @templates = GetModificationTemplates();
   foreach my $this_template (@templates) {
       if($this_template->{'name'} eq $marc_mod_template) {
          if(!defined $marc_mod_template_id) {
               $marc_mod_template_id = $this_template->{'template_id'};
           } else {
               print "WARNING: MARC modification template name " .
                   "'$marc_mod_template' matches multiple templates. " .
                   "Please fix this issue before proceeding.\n";
               exit 1;
           }
       }
   }

   if(!defined $marc_mod_template_id ) {
       die "Can't locate MARC modification template '$marc_mod_template'\n";
   }
}

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

if (not $result or $input_file eq "" or $want_help) {
    print_usage();
    exit 0;
}
if ( $format !~ /^(MARCXML|ISO2709)$/i ) {
    print "\n --format must be MARCXML or ISO2709\n";
    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(
    {
        format               => $format,
        input_file           => $input_file,
        record_type          => $record_type,
        match                => $match,
        add_items            => $add_items,
        batch_comment        => $batch_comment,
        encoding             => $encoding,
        no_replace           => $no_replace,
        no_create            => $no_create,
        item_action          => $item_action,
        marc_mod_template_id => $marc_mod_template_id,
    }
);
$dbh->commit();

exit 0;

sub process_batch {
    my ( $params ) = @_;  #Possible params are: format input_file record_type match add_items batch_comment encoding no_replace no_create item_action
    my $format = $params->{format} // '';
    my $record_type = $params->{record_type} // 'biblio';

    my ( $errors, $marc_records );
    if( $format eq 'ISO2709' ) {
        ( $errors, $marc_records ) = C4::ImportBatch::RecordsFromISO2709File(
            $params->{input_file}, $record_type, $params->{encoding} );
    } elsif( $format eq 'MARCXML' ) {
        ( $errors, $marc_records ) = C4::ImportBatch::RecordsFromMARCXMLFile(
            $params->{input_file}, $params->{encoding} );
    }
    warn ( join ',', @$errors ) if @$errors;
    my $num_input_records = ($marc_records) ? scalar(@$marc_records) : 0;

    print "... staging MARC records -- please wait\n";
    #FIXME: We should really allow the use of marc modification frameworks and to_marc plugins here if possible
    my ( $batch_id, $num_valid_records, $num_items, @import_errors ) =
      BatchStageMarcRecords(
        $record_type,                      $params->{encoding},
        $marc_records,                     $params->{input_file},
        $params->{'marc_mod_template_id'}, $params->{batch_comment},
        '',                                $params->{add_items},
        0,                                 100,
        \&print_progress_and_commit
      );
    print "... finished staging MARC records\n";

    my $num_with_matches = 0;
    if ( $params->{match} ) {
        my $matcher = C4::Matcher->fetch( $params->{match} );
        if (defined $matcher) {
            SetImportBatchMatcher( $batch_id, $params->{match} );
        } elsif ($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, $params->{no_replace} ? 'ignore' : 'replace' );
        SetImportBatchNoMatchAction( $batch_id, $params->{no_create} ? 'ignore' : 'create_new' );
        SetImportBatchItemAction( $batch_id, $params->{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:                 $params->{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( $params->{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 ( $params->{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 UTF-8.
                            Other possible options are: MARC-8,
                            ISO_5426, ISO_6937, ISO_8859-1, EUC-KR
    --format                The MARC transport format to use?
                            Defaults to ISO2709.
                            Available values, MARCXML, ISO2709.
    --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.
    --no-create             nomatch action for record: default is to
                            create new record with imported record.
    --comment <comment>     optional comment to describe
                            the record batch; if the comment
                            has spaces in it, surround the
                            comment with quotation marks.
    --marcmodtemplate <TEMPLATE>
                            This parameter allows you to specify the
                            name of an existing MARC modification
                            template to apply as the MARC records are
                            imported (these templates are created in
                            the "MARC modification templates" tool in
                            Koha). If not specified, no MARC modification
                            templates are used (default).
    --help or -h            show this message.
_USAGE_
}