package C4::ImportBatch;

# Copyright (C) 2007 LibLime
#
# 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., 59 Temple Place,
# Suite 330, Boston, MA  02111-1307 USA

use strict;
use C4::Context;
use C4::Koha;
use C4::Biblio;
require Exporter;


use vars qw($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);

# set the version for version checking
$VERSION = 3.00;

=head1 NAME

C4::ImportBatch - manage batches of imported MARC records

=head1 SYNOPSIS

=over 4

use C4::ImportBatch;

=back

=head1 FUNCTIONS

=cut

@ISA    = qw(Exporter);
@EXPORT = qw(
    GetZ3950BatchId
    GetImportRecordMarc
    AddImportBatch
    GetImportBatch
    AddBiblioToBatch
    ModBiblioInBatch

    BatchStageMarcRecords
    BatchFindBibDuplicates
    BatchCommitBibRecords
    BatchRevertBibRecords

    GetAllImportBatches
    GetImportBatchRangeDesc
    GetNumberOfNonZ3950ImportBatches
    GetImportBibliosRange
    
    GetImportBatchStatus
    SetImportBatchStatus
    GetImportBatchOverlayAction
    SetImportBatchOverlayAction
    GetImportBatchMatcher
    SetImportBatchMatcher
    GetImportRecordOverlayStatus
    SetImportRecordOverlayStatus
    GetImportRecordStatus
    SetImportRecordStatus
    GetImportRecordMatches
    SetImportRecordMatches
);

=head2 GetZ3950BatchId

=over 4

my $batchid = GetZ3950BatchId($z3950server);

=back

Retrieves the ID of the import batch for the Z39.50
reservoir for the given target.  If necessary,
creates the import batch.

=cut

sub GetZ3950BatchId {
    my ($z3950server) = @_;

    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare("SELECT import_batch_id FROM import_batches
                             WHERE  batch_type = 'z3950'
                             AND    file_name = ?");
    $sth->execute($z3950server);
    my $rowref = $sth->fetchrow_arrayref();
    $sth->finish();
    if (defined $rowref) {
        return $rowref->[0];
    } else {
        my $batch_id = AddImportBatch('create_new', 'staged', 'z3950', $z3950server, '');
        return $batch_id;
    }
    
}

=head2 GetImportRecordMarc

=over 4

my ($marcblob, $encoding) = GetImportRecordMarc($import_record_id);

=back

=cut

sub GetImportRecordMarc {
    my ($import_record_id) = @_;

    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare("SELECT marc, encoding FROM import_records WHERE import_record_id = ?");
    $sth->execute($import_record_id);
    my ($marc, $encoding) = $sth->fetchrow();
    $sth->finish();
    return $marc;

}

=head2 AddImportBatch

=over 4

my $batch_id = AddImportBatch($overlay_action, $import_status, $type, $file_name, $comments);

=back

=cut

sub AddImportBatch {
    my ($overlay_action, $import_status, $type, $file_name, $comments) = @_;

    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare("INSERT INTO import_batches (overlay_action, import_status, batch_type,
                                                         file_name, comments)
                                    VALUES (?, ?, ?, ?, ?)");
    $sth->execute($overlay_action, $import_status, $type, $file_name, $comments);
    my $batch_id = $dbh->{'mysql_insertid'};
    $sth->finish();

    return $batch_id;

}

=head2 GetImportBatch 

=over 4

my $row = GetImportBatch($batch_id);

=back

Retrieve a hashref of an import_batches row.

=cut

sub GetImportBatch {
    my ($batch_id) = @_;

    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare_cached("SELECT * FROM import_batches WHERE import_batch_id = ?");
    $sth->bind_param(1, $batch_id);
    $sth->execute();
    my $result = $sth->fetchrow_hashref;
    $sth->finish();
    return $result;

}

=head2 AddBiblioToBatch 

=over 4

my $import_record_id = AddBiblioToBatch($batch_id, $record_sequence, $marc_record, $encoding, $z3950random, $update_counts);

=back

=cut

sub AddBiblioToBatch {
    my $batch_id = shift;
    my $record_sequence = shift;
    my $marc_record = shift;
    my $encoding = shift;
    my $z3950random = shift;
    my $update_counts = @_ ? shift : 1;

    my $import_record_id = _create_import_record($batch_id, $record_sequence, $marc_record, 'biblio', $encoding, $z3950random);
    _add_biblio_fields($import_record_id, $marc_record);
    _update_batch_record_counts($batch_id) if $update_counts;
    return $import_record_id;
}

=head2 ModBiblioInBatch

=over 4

ModBiblioInBatch($import_record_id, $marc_record);

=back

=cut

sub ModBiblioInBatch {
    my ($import_record_id, $marc_record) = @_;

    _update_import_record_marc($import_record_id, $marc_record);
    _update_biblio_fields($import_record_id, $marc_record);

}

=head2 BatchStageMarcRecords

=over 4

($batch_id, $num_records, $num_items, @invalid_records) = 
    BatchStageMarcRecords($marc_flavor, $marc_records, $file_name, 
                          $comments, $branch_code, $parse_items,
                          $leave_as_staging, 
                          $progress_interval, $progress_callback);

=back

=cut

sub  BatchStageMarcRecords {
    my $marc_flavor = shift;
    my $marc_records = shift;
    my $file_name = shift;
    my $comments = shift;
    my $branch_code = shift;
    my $parse_items = shift;
    my $leave_as_staging = shift;
   
    # optional callback to monitor status 
    # of job
    my $progress_interval = 0;
    my $progress_callback = undef;
    if ($#_ == 1) {
        $progress_interval = shift;
        $progress_callback = shift;
        $progress_interval = 0 unless $progress_interval =~ /^\d+$/ and $progress_interval > 0;
        $progress_interval = 0 unless 'CODE' eq ref $progress_callback;
    } 
    
    my $batch_id = AddImportBatch('create_new', 'staging', 'batch', $file_name, $comments);
    my @invalid_records = ();
    my $num_valid = 0;
    my $num_items = 0;
    # FIXME - for now, we're dealing only with bibs
    my $rec_num = 0;
    foreach my $marc_blob (split(/\x1D/, $marc_records)) {
        $rec_num++;
        if ($progress_interval and (0 == ($rec_num % $progress_interval))) {
            &$progress_callback($rec_num);
        }
        my $marc_record = FixEncoding($marc_blob, "\x1D");
        my $import_record_id;
        if (scalar($marc_record->fields()) == 0) {
            push @invalid_records, $marc_blob;
        } else {
            $num_valid++;
            $import_record_id = AddBiblioToBatch($batch_id, $rec_num, $marc_record, $marc_flavor, int(rand(99999)), 0);
            if ($parse_items) {
                my @import_items_ids = AddItemsToImportBiblio($batch_id, $import_record_id, $marc_record, 0);
                $num_items += scalar(@import_items_ids);
            }
        }
    }
    unless ($leave_as_staging) {
        SetImportBatchStatus($batch_id, 'staged');
    }
    # FIXME branch_code, number of bibs, number of items
    _update_batch_record_counts($batch_id);
    return ($batch_id, $num_valid, $num_items, @invalid_records);
}

=head2 AddItemsToImportBiblio

=over 4

my @import_items_ids = AddItemsToImportBiblio($batch_id, $import_record_id, $marc_record, $update_counts);

=back

=cut

sub AddItemsToImportBiblio {
    my $batch_id = shift;
    my $import_record_id = shift;
    my $marc_record = shift;
    my $update_counts = @_ ? shift : 0;

    my @import_items_ids = ();
   
    my $dbh = C4::Context->dbh; 
    my ($item_tag,$item_subfield) = &GetMarcFromKohaField("items.itemnumber",'');
    foreach my $item_field ($marc_record->field($item_tag)) {
        my $item_marc = MARC::Record->new();
        $item_marc->append_fields($item_field);
        $marc_record->delete_field($item_field);
        my $sth = $dbh->prepare_cached("INSERT INTO import_items (import_record_id, status, marcxml)
                                        VALUES (?, ?, ?)");
        $sth->bind_param(1, $import_record_id);
        $sth->bind_param(2, 'staged');
        $sth->bind_param(3, $item_marc->as_xml());
        $sth->execute();
        push @import_items_ids, $dbh->{'mysql_insertid'};
        $sth->finish();
    }

    if ($#import_items_ids > -1) {
        _update_batch_record_counts($batch_id) if $update_counts;
        _update_import_record_marc($import_record_id, $marc_record);
    }
    return @import_items_ids;
}

=head2 BatchFindBibDuplicates

=over 4

my $num_with_matches = BatchFindBibDuplicates($batch_id, $matcher, $max_matches, $progress_interval, $progress_callback);

=back

Goes through the records loaded in the batch and attempts to 
find duplicates for each one.  Sets the overlay action to
"replace" if it was "create_new", and sets the overlay status
of each record to "no_match" or "auto_match" as appropriate.

The $max_matches parameter is optional; if it is not supplied,
it defaults to 10.

The $progress_interval and $progress_callback parameters are 
optional; if both are supplied, the sub referred to by
$progress_callback will be invoked every $progress_interval
records using the number of records processed as the 
singular argument.

=cut

sub BatchFindBibDuplicates {
    my $batch_id = shift;
    my $matcher = shift;
    my $max_matches = @_ ? shift : 10;

    # optional callback to monitor status 
    # of job
    my $progress_interval = 0;
    my $progress_callback = undef;
    if ($#_ == 1) {
        $progress_interval = shift;
        $progress_callback = shift;
        $progress_interval = 0 unless $progress_interval =~ /^\d+$/ and $progress_interval > 0;
        $progress_interval = 0 unless 'CODE' eq ref $progress_callback;
    }

    my $dbh = C4::Context->dbh;
    my $old_overlay_action = GetImportBatchOverlayAction($batch_id);
    if ($old_overlay_action eq "create_new") {
        SetImportBatchOverlayAction($batch_id, 'replace');
    }

    my $sth = $dbh->prepare("SELECT import_record_id, marc
                             FROM import_records
                             JOIN import_biblios USING (import_record_id)
                             WHERE import_batch_id = ?");
    $sth->execute($batch_id);
    my $num_with_matches = 0;
    my $rec_num = 0;
    while (my $rowref = $sth->fetchrow_hashref) {
        $rec_num++;
        if ($progress_interval and (0 == ($rec_num % $progress_interval))) {
            &$progress_callback($rec_num);
        }
        my $marc_record = MARC::Record->new_from_usmarc($rowref->{'marc'});
        my @matches = ();
        if (defined $matcher) {
            @matches = $matcher->get_matches($marc_record, $max_matches);
        }
        if (scalar(@matches) > 0) {
            $num_with_matches++;
            SetImportRecordMatches($rowref->{'import_record_id'}, @matches);
            SetImportRecordOverlayStatus($rowref->{'import_record_id'}, 'auto_match');
        } else {
            SetImportRecordMatches($rowref->{'import_record_id'}, ());
            SetImportRecordOverlayStatus($rowref->{'import_record_id'}, 'no_match');
        }
    }
    $sth->finish();
    return $num_with_matches;
}

=head2 BatchCommitBibRecords

=over 4

my ($num_added, $num_updated, $num_items_added, $num_items_errored, $num_ignored) = 
    BatchCommitBibRecords($batch_id, $progress_interval, $progress_callback);

=back

=cut

sub BatchCommitBibRecords {
    my $batch_id = shift;

    # optional callback to monitor status 
    # of job
    my $progress_interval = 0;
    my $progress_callback = undef;
    if ($#_ == 1) {
        $progress_interval = shift;
        $progress_callback = shift;
        $progress_interval = 0 unless $progress_interval =~ /^\d+$/ and $progress_interval > 0;
        $progress_interval = 0 unless 'CODE' eq ref $progress_callback;
    }

    my $num_added = 0;
    my $num_updated = 0;
    my $num_items_added = 0;
    my $num_items_errored = 0;
    my $num_ignored = 0;
    # commit (i.e., save, all records in the batch)
    # FIXME biblio only at the moment
    SetImportBatchStatus('importing');
    my $overlay_action = GetImportBatchOverlayAction($batch_id);
    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare("SELECT import_record_id, status, overlay_status, marc, encoding
                             FROM import_records
                             JOIN import_biblios USING (import_record_id)
                             WHERE import_batch_id = ?");
    $sth->execute($batch_id);
    my $rec_num = 0;
    while (my $rowref = $sth->fetchrow_hashref) {
        $rec_num++;
        if ($progress_interval and (0 == ($rec_num % $progress_interval))) {
            &$progress_callback($rec_num);
        }
        if ($rowref->{'status'} eq 'error' or $rowref->{'status'} eq 'imported') {
            $num_ignored++;
        }
        my $marc_record = MARC::Record->new_from_usmarc($rowref->{'marc'});
        if ($overlay_action eq 'create_new' or
            ($overlay_action eq 'replace' and $rowref->{'overlay_status'} eq 'no_match')) {
            $num_added++;
            my ($biblionumber, $biblioitemnumber) = AddBiblio($marc_record, '');
            my $sth = $dbh->prepare_cached("UPDATE import_biblios SET matched_biblionumber = ? WHERE import_record_id = ?");
            $sth->execute($biblionumber, $rowref->{'import_record_id'});
            $sth->finish();
            my ($bib_items_added, $bib_items_errored) = BatchCommitItems($rowref->{'import_record_id'}, $biblionumber);
            $num_items_added += $bib_items_added;
            $num_items_errored += $bib_items_errored;
            SetImportRecordStatus($rowref->{'import_record_id'}, 'imported');
        } else {
            $num_updated++;
            my $biblionumber = GetBestRecordMatch($rowref->{'import_record_id'});
            my ($count, $oldbiblio) = GetBiblio($biblionumber);
            my $oldxml = GetXmlBiblio($biblionumber);

            # remove item fields so that they don't get
            # added again if record is reverted
            my $old_marc = MARC::Record->new_from_xml($oldxml, 'UTF-8', $rowref->{'encoding'});
            my ($item_tag,$item_subfield) = &GetMarcFromKohaField("items.itemnumber",'');
            foreach my $item_field ($old_marc->field($item_tag)) {
                $old_marc->delete_field($item_field);
            }

            ModBiblio($marc_record, $biblionumber, $oldbiblio->{'frameworkcode'});
            my $sth = $dbh->prepare_cached("UPDATE import_records SET marcxml_old = ? WHERE import_record_id = ?");
            $sth->execute($old_marc->as_xml(), $rowref->{'import_record_id'});
            $sth->finish();
            my $sth2 = $dbh->prepare_cached("UPDATE import_biblios SET matched_biblionumber = ? WHERE import_record_id = ?");
            $sth2->execute($biblionumber, $rowref->{'import_record_id'});
            $sth2->finish();
            my ($bib_items_added, $bib_items_errored) = BatchCommitItems($rowref->{'import_record_id'}, $biblionumber);
            $num_items_added += $bib_items_added;
            $num_items_errored += $bib_items_errored;
            SetImportRecordOverlayStatus($rowref->{'import_record_id'}, 'match_applied');
            SetImportRecordStatus($rowref->{'import_record_id'}, 'imported');
        }
    }
    $sth->finish();
    SetImportBatchStatus($batch_id, 'imported');
    return ($num_added, $num_updated, $num_items_added, $num_items_errored, $num_ignored);
}

=head2 BatchCommitItems

=over 4

($num_items_added, $num_items_errored) = BatchCommitItems($import_record_id, $biblionumber);

=back

=cut

sub BatchCommitItems {
    my ($import_record_id, $biblionumber) = @_;

    my $dbh = C4::Context->dbh;

    my $num_items_added = 0;
    my $num_items_errored = 0;
    my $sth = $dbh->prepare("SELECT import_items_id, import_items.marcxml, encoding
                             FROM import_items
                             JOIN import_records USING (import_record_id)
                             WHERE import_record_id = ?
                             ORDER BY import_items_id");
    $sth->bind_param(1, $import_record_id);
    $sth->execute();
    while (my $row = $sth->fetchrow_hashref()) {
        my $item_marc = MARC::Record->new_from_xml($row->{'marcxml'}, 'UTF-8', $row->{'encoding'});
        # FIXME - duplicate barcode check needs to become part of AddItem()
        my $item = TransformMarcToKoha($dbh, $item_marc);
        my $duplicate_barcode = exists($item->{'barcode'}) && GetItemnumberFromBarcode($item->{'barcode'});
        if ($duplicate_barcode) {
            my $updsth = $dbh->prepare("UPDATE import_items SET status = ?, import_error = ? WHERE import_items_id = ?");
            $updsth->bind_param(1, 'error');
            $updsth->bind_param(2, 'duplicate item barcode');
            $updsth->bind_param(3, $row->{'import_items_id'});
            $updsth->execute();
            $num_items_errored++;
        } else {
            my ($item_biblionumber, $biblioitemnumber, $itemnumber) = AddItem($item_marc, $biblionumber);
            my $updsth = $dbh->prepare("UPDATE import_items SET status = ?, itemnumber = ? WHERE import_items_id = ?");
            $updsth->bind_param(1, 'imported');
            $updsth->bind_param(2, $itemnumber);
            $updsth->bind_param(3, $row->{'import_items_id'});
            $updsth->execute();
            $updsth->finish();
            $num_items_added++;
        }
    }
    $sth->finish();
    return ($num_items_added, $num_items_errored);
}

=head2 BatchRevertBibRecords

=over 4

my ($num_deleted, $num_errors, $num_reverted, $num_items_deleted, $num_ignored) = BatchRevertBibRecords($batch_id);

=back

=cut

sub BatchRevertBibRecords {
    my $batch_id = shift;

    my $num_deleted = 0;
    my $num_errors = 0;
    my $num_reverted = 0;
    my $num_items_deleted = 0;
    my $num_ignored = 0;
    # commit (i.e., save, all records in the batch)
    # FIXME biblio only at the moment
    SetImportBatchStatus('reverting');
    my $overlay_action = GetImportBatchOverlayAction($batch_id);
    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare("SELECT import_record_id, status, overlay_status, marcxml_old, encoding, matched_biblionumber
                             FROM import_records
                             JOIN import_biblios USING (import_record_id)
                             WHERE import_batch_id = ?");
    $sth->execute($batch_id);
    while (my $rowref = $sth->fetchrow_hashref) {
        if ($rowref->{'status'} eq 'error' or $rowref->{'status'} eq 'reverted') {
            $num_ignored++;
        }
        if ($overlay_action eq 'create_new' or
            ($overlay_action eq 'replace' and $rowref->{'overlay_status'} eq 'no_match')) {
            $num_items_deleted += BatchRevertItems($rowref->{'import_record_id'}, $rowref->{'matched_biblionumber'});
            my $error = DelBiblio($rowref->{'matched_biblionumber'});
            if (defined $error) {
                $num_errors++;
            } else {
                $num_deleted++;
                SetImportRecordStatus($rowref->{'import_record_id'}, 'reverted');
            }
        } else {
            $num_reverted++;
            my $old_record = MARC::Record->new_from_xml($rowref->{'marcxml_old'}, 'UTF-8', $rowref->{'encoding'});
            my $biblionumber = $rowref->{'matched_biblionumber'};
            my ($count, $oldbiblio) = GetBiblio($biblionumber);
            $num_items_deleted += BatchRevertItems($rowref->{'import_record_id'}, $rowref->{'matched_biblionumber'});
            ModBiblio($old_record, $biblionumber, $oldbiblio->{'frameworkcode'});
            SetImportRecordStatus($rowref->{'import_record_id'}, 'reverted');
        }
    }
    $sth->finish();
    SetImportBatchStatus($batch_id, 'reverted');
    return ($num_deleted, $num_errors, $num_reverted, $num_items_deleted, $num_ignored);
}

=head2 BatchRevertItems

=over 4

my $num_items_deleted = BatchRevertItems($import_record_id, $biblionumber);

=back

=cut

sub BatchRevertItems {
    my ($import_record_id, $biblionumber) = @_;

    my $dbh = C4::Context->dbh;
    my $num_items_deleted = 0;

    my $sth = $dbh->prepare_cached("SELECT import_items_id, itemnumber
                                   FROM import_items
                                   JOIN items USING (itemnumber)
                                   WHERE import_record_id = ?");
    $sth->bind_param(1, $import_record_id);
    $sth->execute();
    while (my $row = $sth->fetchrow_hashref()) {
        DelItem($dbh, $biblionumber, $row->{'itemnumber'});
        my $updsth = $dbh->prepare("UPDATE import_items SET status = ? WHERE import_items_id = ?");
        $updsth->bind_param(1, 'reverted');
        $updsth->bind_param(2, $row->{'import_items_id'});
        $updsth->execute();
        $updsth->finish();
        $num_items_deleted++;
    }
    $sth->finish();
    return $num_items_deleted;
}

=head2 GetAllImportBatches

=over 4

my $results = GetAllImportBatches();

=back

Returns a references to an array of hash references corresponding
to all import_batches rows (of batch_type 'batch'), sorted in 
ascending order by import_batch_id.

=cut

sub  GetAllImportBatches {
    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare_cached("SELECT * FROM import_batches
                                    WHERE batch_type = 'batch'
                                    ORDER BY import_batch_id ASC");

    my $results = [];
    $sth->execute();
    while (my $row = $sth->fetchrow_hashref) {
        push @$results, $row;
    }
    $sth->finish();
    return $results;
}

=head2 GetImportBatchRangeDesc

=over 4

my $results = GetImportBatchRangeDesc($offset, $results_per_group);

=back

Returns a reference to an array of hash references corresponding to
import_batches rows (sorted in descending order by import_batch_id)
start at the given offset.

=cut

sub GetImportBatchRangeDesc {
    my ($offset, $results_per_group) = @_;

    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare_cached("SELECT * FROM import_batches
                                    WHERE batch_type = 'batch'
                                    ORDER BY import_batch_id DESC
                                    LIMIT ? OFFSET ?");
    $sth->bind_param(1, $results_per_group);
    $sth->bind_param(2, $offset);

    my $results = [];
    $sth->execute();
    while (my $row = $sth->fetchrow_hashref) {
        push @$results, $row;
    }
    $sth->finish();
    return $results;
}

=head2 GetNumberOfImportBatches 

=over 4

my $count = GetNumberOfImportBatches();

=back

=cut

sub GetNumberOfNonZ3950ImportBatches {
    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare("SELECT COUNT(*) FROM import_batches WHERE batch_type='batch'");
    $sth->execute();
    my ($count) = $sth->fetchrow_array();
    $sth->finish();
    return $count;
}

=head2 GetImportBibliosRange

=over 4

my $results = GetImportBibliosRange($batch_id, $offset, $results_per_group);

=back

Returns a reference to an array of hash references corresponding to
import_biblios/import_records rows for a given batch
starting at the given offset.

=cut

sub GetImportBibliosRange {
    my ($batch_id, $offset, $results_per_group) = @_;

    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare_cached("SELECT title, author, isbn, issn, import_record_id, record_sequence,
                                           status, overlay_status
                                    FROM   import_records
                                    JOIN   import_biblios USING (import_record_id)
                                    WHERE  import_batch_id = ?
                                    ORDER BY import_record_id LIMIT ? OFFSET ?");
    $sth->bind_param(1, $batch_id);
    $sth->bind_param(2, $results_per_group);
    $sth->bind_param(3, $offset);
    my $results = [];
    $sth->execute();
    while (my $row = $sth->fetchrow_hashref) {
        push @$results, $row;
    }
    $sth->finish();
    return $results;

}

=head2 GetBestRecordMatch

=over 4

my $record_id = GetBestRecordMatch($import_record_id);

=back

=cut

sub GetBestRecordMatch {
    my ($import_record_id) = @_;

    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare("SELECT candidate_match_id
                             FROM   import_record_matches
                             WHERE  import_record_id = ?
                             ORDER BY score DESC, candidate_match_id DESC");
    $sth->execute($import_record_id);
    my ($record_id) = $sth->fetchrow_array();
    $sth->finish();
    return $record_id;
}

=head2 GetImportBatchStatus

=over 4

my $status = GetImportBatchStatus($batch_id);

=back

=cut

sub GetImportBatchStatus {
    my ($batch_id) = @_;

    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare("SELECT import_status FROM import_batches WHERE batch_id = ?");
    $sth->execute($batch_id);
    my ($status) = $sth->fetchrow_array();
    $sth->finish();
    return;

}


=head2 SetImportBatchStatus

=over 4

SetImportBatchStatus($batch_id, $new_status);

=back

=cut

sub SetImportBatchStatus {
    my ($batch_id, $new_status) = @_;

    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare("UPDATE import_batches SET import_status = ? WHERE import_batch_id = ?");
    $sth->execute($new_status, $batch_id);
    $sth->finish();

}

=head2 GetImportBatchOverlayAction

=over 4

my $overlay_action = GetImportBatchOverlayAction($batch_id);

=back

=cut

sub GetImportBatchOverlayAction {
    my ($batch_id) = @_;

    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare("SELECT overlay_action FROM import_batches WHERE import_batch_id = ?");
    $sth->execute($batch_id);
    my ($overlay_action) = $sth->fetchrow_array();
    $sth->finish();
    return $overlay_action;

}


=head2 SetImportBatchOverlayAction

=over 4

SetImportBatchOverlayAction($batch_id, $new_overlay_action);

=back

=cut

sub SetImportBatchOverlayAction {
    my ($batch_id, $new_overlay_action) = @_;

    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare("UPDATE import_batches SET overlay_action = ? WHERE import_batch_id = ?");
    $sth->execute($new_overlay_action, $batch_id);
    $sth->finish();

}

=head2 GetImportBatchMatcher

=over 4

my $matcher_id = GetImportBatchMatcher($batch_id);

=back

=cut

sub GetImportBatchMatcher {
    my ($batch_id) = @_;

    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare("SELECT matcher_id FROM import_batches WHERE import_batch_id = ?");
    $sth->execute($batch_id);
    my ($matcher_id) = $sth->fetchrow_array();
    $sth->finish();
    return $matcher_id;

}


=head2 SetImportBatchMatcher

=over 4

SetImportBatchMatcher($batch_id, $new_matcher_id);

=back

=cut

sub SetImportBatchMatcher {
    my ($batch_id, $new_matcher_id) = @_;

    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare("UPDATE import_batches SET matcher_id = ? WHERE import_batch_id = ?");
    $sth->execute($new_matcher_id, $batch_id);
    $sth->finish();

}

=head2 GetImportRecordOverlayStatus

=over 4

my $overlay_status = GetImportRecordOverlayStatus($import_record_id);

=back

=cut

sub GetImportRecordOverlayStatus {
    my ($import_record_id) = @_;

    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare("SELECT overlay_status FROM import_records WHERE import_record_id = ?");
    $sth->execute($import_record_id);
    my ($overlay_status) = $sth->fetchrow_array();
    $sth->finish();
    return $overlay_status;

}


=head2 SetImportRecordOverlayStatus

=over 4

SetImportRecordOverlayStatus($import_record_id, $new_overlay_status);

=back

=cut

sub SetImportRecordOverlayStatus {
    my ($import_record_id, $new_overlay_status) = @_;

    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare("UPDATE import_records SET overlay_status = ? WHERE import_record_id = ?");
    $sth->execute($new_overlay_status, $import_record_id);
    $sth->finish();

}

=head2 GetImportRecordStatus

=over 4

my $overlay_status = GetImportRecordStatus($import_record_id);

=back

=cut

sub GetImportRecordStatus {
    my ($import_record_id) = @_;

    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare("SELECT status FROM import_records WHERE import_record_id = ?");
    $sth->execute($import_record_id);
    my ($overlay_status) = $sth->fetchrow_array();
    $sth->finish();
    return $overlay_status;

}


=head2 SetImportRecordStatus

=over 4

SetImportRecordStatus($import_record_id, $new_overlay_status);

=back

=cut

sub SetImportRecordStatus {
    my ($import_record_id, $new_overlay_status) = @_;

    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare("UPDATE import_records SET status = ? WHERE import_record_id = ?");
    $sth->execute($new_overlay_status, $import_record_id);
    $sth->finish();

}

=head2 GetImportRecordMatches

=over 4

my $results = GetImportRecordMatches($import_record_id, $best_only);

=back

=cut

sub GetImportRecordMatches {
    my $import_record_id = shift;
    my $best_only = @_ ? shift : 0;

    my $dbh = C4::Context->dbh;
    # FIXME currently biblio only
    my $sth = $dbh->prepare_cached("SELECT title, author, biblionumber, score
                                    FROM import_records
                                    JOIN import_record_matches USING (import_record_id)
                                    JOIN biblio ON (biblionumber = candidate_match_id)
                                    WHERE import_record_id = ?
                                    ORDER BY score DESC, biblionumber DESC");
    $sth->bind_param(1, $import_record_id);
    my $results = [];
    $sth->execute();
    while (my $row = $sth->fetchrow_hashref) {
        push @$results, $row;
        last if $best_only;
    }
    $sth->finish();

    return $results;
    
}


=head2 SetImportRecordMatches

=over 4

SetImportRecordMatches($import_record_id, @matches);

=back

=cut

sub SetImportRecordMatches {
    my $import_record_id = shift;
    my @matches = @_;

    my $dbh = C4::Context->dbh;
    my $delsth = $dbh->prepare("DELETE FROM import_record_matches WHERE import_record_id = ?");
    $delsth->execute($import_record_id);
    $delsth->finish();

    my $sth = $dbh->prepare("INSERT INTO import_record_matches (import_record_id, candidate_match_id, score)
                                    VALUES (?, ?, ?)");
    foreach my $match (@matches) {
        $sth->execute($import_record_id, $match->{'record_id'}, $match->{'score'});
    }
}


# internal functions

sub _create_import_record {
    my ($batch_id, $record_sequence, $marc_record, $record_type, $encoding, $z3950random) = @_;

    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare("INSERT INTO import_records (import_batch_id, record_sequence, marc, marcxml, 
                                                         record_type, encoding, z3950random)
                                    VALUES (?, ?, ?, ?, ?, ?, ?)");
    $sth->execute($batch_id, $record_sequence, $marc_record->as_usmarc(), $marc_record->as_xml(),
                  $record_type, $encoding, $z3950random);
    my $import_record_id = $dbh->{'mysql_insertid'};
    $sth->finish();
    return $import_record_id;
}

sub _update_import_record_marc {
    my ($import_record_id, $marc_record) = @_;

    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare("UPDATE import_records SET marc = ?, marcxml = ?
                             WHERE  import_record_id = ?");
    $sth->execute($marc_record->as_usmarc(), $marc_record->as_xml(), $import_record_id);
    $sth->finish();
}

sub _add_biblio_fields {
    my ($import_record_id, $marc_record) = @_;

    my ($title, $author, $isbn, $issn) = _parse_biblio_fields($marc_record);
    my $dbh = C4::Context->dbh;
    # FIXME no controlnumber, originalsource
    # FIXME 2 - should regularize normalization of ISBN wherever it is done
    $isbn =~ s/\(.*$//;
    $isbn =~ tr/ -_//;  
    $isbn = uc $isbn;
    my $sth = $dbh->prepare("INSERT INTO import_biblios (import_record_id, title, author, isbn, issn) VALUES (?, ?, ?, ?, ?)");
    $sth->execute($import_record_id, $title, $author, $isbn, $issn);
    $sth->finish();
                
}

sub _update_biblio_fields {
    my ($import_record_id, $marc_record) = @_;

    my ($title, $author, $isbn, $issn) = _parse_biblio_fields($marc_record);
    my $dbh = C4::Context->dbh;
    # FIXME no controlnumber, originalsource
    # FIXME 2 - should regularize normalization of ISBN wherever it is done
    $isbn =~ s/\(.*$//;
    $isbn =~ tr/ -_//;
    $isbn = uc $isbn;
    my $sth = $dbh->prepare("UPDATE import_biblios SET title = ?, author = ?, isbn = ?, issn = ?
                             WHERE  import_record_id = ?");
    $sth->execute($title, $author, $isbn, $issn, $import_record_id);
    $sth->finish();
}

sub _parse_biblio_fields {
    my ($marc_record) = @_;

    my $dbh = C4::Context->dbh;
    my $bibliofields = TransformMarcToKoha($dbh, $marc_record, '');
    return ($bibliofields->{'title'}, $bibliofields->{'author'}, $bibliofields->{'isbn'}, $bibliofields->{'issn'});

}

sub _update_batch_record_counts {
    my ($batch_id) = @_;

    my $dbh = C4::Context->dbh;
    my $sth = $dbh->prepare_cached("UPDATE import_batches SET num_biblios = (
                                    SELECT COUNT(*)
                                    FROM import_records
                                    WHERE import_batch_id = import_batches.import_batch_id
                                    AND record_type = 'biblio')
                                    WHERE import_batch_id = ?");
    $sth->bind_param(1, $batch_id);
    $sth->execute();
    $sth->finish();
    $sth = $dbh->prepare_cached("UPDATE import_batches SET num_items = (
                                    SELECT COUNT(*)
                                    FROM import_records
                                    JOIN import_items USING (import_record_id)
                                    WHERE import_batch_id = import_batches.import_batch_id
                                    AND record_type = 'biblio')
                                    WHERE import_batch_id = ?");
    $sth->bind_param(1, $batch_id);
    $sth->execute();
    $sth->finish();

}

1;

=head1 AUTHOR

Koha Development Team <info@koha.org>

Galen Charlton <galen.charlton@liblime.com>

=cut