#!/usr/bin/perl

#
# 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 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 MARC::File::XML;
use List::MoreUtils qw(uniq);
use Getopt::Long;
use CGI qw ( -utf8 );
use C4::Auth;
use C4::AuthoritiesMarc;    # GetAuthority
use C4::Biblio;             # GetMarcBiblio
use C4::Branch;             # GetBranches
use C4::Csv;
use C4::Koha;               # GetItemTypes
use C4::Output;
use C4::Record;

my $query = new CGI;

my $clean;
my $dont_export_items;
my $deleted_barcodes;
my $timestamp;
my $record_type;
my $id_list_file;
my $help;
my $op       = $query->param("op")       || '';
my $filename = $query->param("filename") || 'koha.mrc';
my $dbh      = C4::Context->dbh;
my $marcflavour = C4::Context->preference("marcflavour");
my $output_format = $query->param("format") || $query->param("output_format") || 'iso2709';

# Checks if the script is called from commandline
my $commandline = not defined $ENV{GATEWAY_INTERFACE};


# @biblionumbers is only use for csv export from circulation.pl
my @biblionumbers = uniq $query->param("biblionumbers");

if ( $commandline ) {

    # Getting parameters
    $op = 'export';
    GetOptions(
        'format=s'          => \$output_format,
        'date=s'            => \$timestamp,
        'dont_export_items' => \$dont_export_items,
        'deleted_barcodes'  => \$deleted_barcodes,
        'clean'             => \$clean,
        'filename=s'        => \$filename,
        'record-type=s'     => \$record_type,
        'id_list_file=s'    => \$id_list_file,
        'help|?'            => \$help
    );

    if ($help) {
        print <<_USAGE_;
export.pl [--format=format] [--date=date] [--record-type=TYPE] [--dont_export_items] [--deleted_barcodes] [--clean] [--id_list_file=PATH] --filename=outputfile


 --format=FORMAT        FORMAT is either 'xml' or 'marc' (default)

 --date=DATE            DATE should be entered as the 'dateformat' syspref is
                        set (dd/mm/yyyy for metric, yyyy-mm-dd for iso,
                        mm/dd/yyyy for us) records exported are the ones that
                        have been modified since DATE

 --record-type=TYPE     TYPE is 'bibs' or 'auths'

 --deleted_barcodes     If used, a list of barcodes of items deleted since DATE
                        is produced (or from all deleted items if no date is
                        specified). Used only if TYPE is 'bibs'

 --clean                removes NSE/NSB

 --id_list_file=PATH    PATH is a path to a file containing a list of
                        IDs (biblionumber or authid) with one ID per line.
                        This list works as a filter; it is compatible with
                        other parameters for selecting records
_USAGE_
        exit;
    }

    # Default parameters values :
    $timestamp         ||= '';
    $dont_export_items ||= 0;
    $deleted_barcodes  ||= 0;
    $clean             ||= 0;
    $record_type       ||= "bibs";
    $id_list_file       ||= 0;

    # Redirect stdout
    open STDOUT, '>', $filename if $filename;

}
else {

    $op       = $query->param("op")       || '';
    $filename = $query->param("filename") || 'koha.mrc';
    $filename =~ s/(\r|\n)//;

}

# Default value for output_format is 'iso2709'
$output_format ||= 'iso2709';
# Retrocompatibility for the format parameter
$output_format = 'iso2709' if $output_format eq 'marc';

my ( $template, $loggedinuser, $cookie, $flags ) = get_template_and_user(
    {
        template_name   => "tools/export.tt",
        query           => $query,
        type            => "intranet",
        authnotrequired => $commandline,
        flagsrequired   => { tools => 'export_catalog' },
        debug           => 1,
    }
);

my $limit_ind_branch =
  (      C4::Context->preference('IndependentBranches')
      && C4::Context->userenv
      && !C4::Context->IsSuperLibrarian()
      && C4::Context->userenv->{branch} ) ? 1 : 0;

my @branch = $query->param("branch");
if (   C4::Context->preference("IndependentBranches")
    && C4::Context->userenv
    && !C4::Context->IsSuperLibrarian() )
{
    @branch = ( C4::Context->userenv->{'branch'} );
}
# if stripping nonlocal items, use loggedinuser's branch
my $localbranch = C4::Context->userenv->{'branch'};

my %branchmap = map { $_ => 1 } @branch; # for quick lookups

my $backupdir = C4::Context->config('backupdir');

if ( $op eq "export" ) {
    if (
        $output_format eq "iso2709"
            or $output_format eq "xml"
            or (
                $output_format eq 'csv'
                    and not @biblionumbers
            )
    ) {
        my $charset  = 'utf-8';
        my $mimetype = 'application/octet-stream';

        binmode STDOUT, ':encoding(UTF-8)'
            if $filename =~ m/\.gz$/
                or $filename =~ m/\.bz2$/;

        if ( $filename =~ m/\.gz$/ ) {
            $mimetype = 'application/x-gzip';
            $charset  = '';
            binmode STDOUT;
        }
        elsif ( $filename =~ m/\.bz2$/ ) {
            $mimetype = 'application/x-bzip2';
            binmode STDOUT;
            $charset = '';
        }
        print $query->header(
            -type       => $mimetype,
            -charset    => $charset,
            -attachment => $filename,
        ) unless ($commandline);

        $record_type = $query->param("record_type") unless ($commandline);
        my $export_remove_fields = $query->param("export_remove_fields");
        my @biblionumbers      = $query->param("biblionumbers");
        my @itemnumbers        = $query->param("itemnumbers");
        my @sql_params;
        my $sql_query;
        my @recordids;

        my $StartingBiblionumber = $query->param("StartingBiblionumber");
        my $EndingBiblionumber   = $query->param("EndingBiblionumber");
        my $itemtype             = $query->param("itemtype");
        my $start_callnumber     = $query->param("start_callnumber");
        my $end_callnumber       = $query->param("end_callnumber");
        $timestamp = ($timestamp) ? C4::Dates->new($timestamp) : ''
          if ($commandline);
        my $start_accession =
          ( $query->param("start_accession") )
          ? C4::Dates->new( $query->param("start_accession") )
          : '';
        my $end_accession =
          ( $query->param("end_accession") )
          ? C4::Dates->new( $query->param("end_accession") )
          : '';
        $dont_export_items = $query->param("dont_export_item")
          unless ($commandline);

        my $strip_nonlocal_items = $query->param("strip_nonlocal_items");

        my $biblioitemstable =
          ( $commandline and $deleted_barcodes )
          ? 'deletedbiblioitems'
          : 'biblioitems';
        my $itemstable =
          ( $commandline and $deleted_barcodes )
          ? 'deleteditems'
          : 'items';

        my $starting_authid = $query->param('starting_authid');
        my $ending_authid   = $query->param('ending_authid');
        my $authtype        = $query->param('authtype');
        my $filefh;
        if ($commandline) {
            open $filefh,"<", $id_list_file or die "cannot open $id_list_file: $!" if $id_list_file;
        } else {
            $filefh = $query->upload("id_list_file");
        }
        my %id_filter;
        if ($filefh) {
            while (my $number=<$filefh>){
                $number=~s/[\r\n]*$//;
                $id_filter{$number}=1 if $number=~/^\d+$/;
            }
        }

        if ( $record_type eq 'bibs' and not @biblionumbers ) {
            if ($timestamp) {

            # Specific query when timestamp is used
            # Actually it's used only with CLI and so all previous filters
            # are not used.
            # If one day timestamp is used via the web interface, this part will
            # certainly have to be rewrited
                my ( $query, $params ) = construct_query(
                    {
                        recordtype       => $record_type,
                        timestamp        => $timestamp,
                        biblioitemstable => $biblioitemstable,
                    }
                );
                $sql_query  = $query;
                @sql_params = @$params;

            }
            else {
                my ( $query, $params ) = construct_query(
                    {
                        recordtype           => $record_type,
                        biblioitemstable     => $biblioitemstable,
                        itemstable           => $itemstable,
                        StartingBiblionumber => $StartingBiblionumber,
                        EndingBiblionumber   => $EndingBiblionumber,
                        branch               => \@branch,
                        start_callnumber     => $start_callnumber,
                        end_callnumber       => $end_callnumber,
                        start_accession      => $start_accession,
                        end_accession        => $end_accession,
                        itemtype             => $itemtype,
                    }
                );
                $sql_query  = $query;
                @sql_params = @$params;
            }
        }
        elsif ( $record_type eq 'auths' ) {
            my ( $query, $params ) = construct_query(
                {
                    recordtype      => $record_type,
                    starting_authid => $starting_authid,
                    ending_authid   => $ending_authid,
                    authtype        => $authtype,
                }
            );
            $sql_query  = $query;
            @sql_params = @$params;

        }
        elsif ( $record_type eq 'db' ) {
            my $successful_export;
            if ( $flags->{superlibrarian}
                && C4::Context->config('backup_db_via_tools') )
            {
                $successful_export = download_backup(
                    {
                        directory => "$backupdir",
                        extension => 'sql',
                        filename  => "$filename"
                    }
                );
            }
            unless ($successful_export) {
                my $remotehost = $query->remote_host();
                $remotehost =~ s/(\n|\r)//;
                warn
"A suspicious attempt was made to download the db at '$filename' by someone at "
                  . $remotehost . "\n";
            }
            exit;
        }
        elsif ( $record_type eq 'conf' ) {
            my $successful_export;
            if ( $flags->{superlibrarian}
                && C4::Context->config('backup_conf_via_tools') )
            {
                $successful_export = download_backup(
                    {
                        directory => "$backupdir",
                        extension => 'tar',
                        filename  => "$filename"
                    }
                );
            }
            unless ($successful_export) {
                my $remotehost = $query->remote_host();
                $remotehost =~ s/(\n|\r)//;
                warn
"A suspicious attempt was made to download the configuration at '$filename' by someone at "
                  . $remotehost . "\n";
            }
            exit;
        }
        elsif (@biblionumbers) {
            push @recordids, (@biblionumbers);
        }
        else {

            # Someone is trying to mess us up
            exit;
        }
        unless (@biblionumbers) {
            my $sth = $dbh->prepare($sql_query);
            $sth->execute(@sql_params);
            push @recordids, map {
                map { $$_[0] } $_
            } @{ $sth->fetchall_arrayref };
            @recordids = grep { exists($id_filter{$_}) } @recordids if scalar(%id_filter);
        }

        my $xml_header_written = 0;
        for my $recordid ( uniq @recordids ) {
            if ($deleted_barcodes) {
                my $q = "
                    SELECT DISTINCT barcode
                    FROM deleteditems
                    WHERE deleteditems.biblionumber = ?
                ";
                my $sth = $dbh->prepare($q);
                $sth->execute($recordid);
                while ( my $row = $sth->fetchrow_array ) {
                    print "$row\n";
                }
            }
            else {
                my $record;
                if ( $record_type eq 'bibs' ) {
                    $record = eval { GetMarcBiblio($recordid); };

                    next if $@;
                    next if not defined $record;
                    C4::Biblio::EmbedItemsInMarcBiblio( $record, $recordid,
                        \@itemnumbers )
                      unless $dont_export_items;
                    if (   $strip_nonlocal_items
                        || $limit_ind_branch
                        || $dont_export_items )
                    {
                        my ( $homebranchfield, $homebranchsubfield ) =
                          GetMarcFromKohaField( 'items.homebranch', '' );
                        for my $itemfield ( $record->field($homebranchfield) ) {
                            $record->delete_field($itemfield)
                              if ( $dont_export_items
                                || $localbranch ne $itemfield->subfield(
                                        $homebranchsubfield) );
                        }
                    }
                }
                elsif ( $record_type eq 'auths' ) {
                    $record = C4::AuthoritiesMarc::GetAuthority($recordid);
                    next if not defined $record;
                }

                if ($export_remove_fields) {
                    for my $f ( split / /, $export_remove_fields ) {
                        if ( $f =~ m/^(\d{3})(.)?$/ ) {
                            my ( $field, $subfield ) = ( $1, $2 );

                            # skip if this record doesn't have this field
                            if ( defined $record->field($field) ) {
                                if ( defined $subfield ) {
                                    my @tags = $record->field($field);
                                    foreach my $t (@tags) {
                                        $t->delete_subfields($subfield);
                                    }
                                }
                                else {
                                    $record->delete_fields($record->field($field));
                                }
                            }
                        }
                    }
                }
                RemoveAllNsb($record) if ($clean);
                if ( $output_format eq "xml" ) {
                    unless ($xml_header_written) {
                        MARC::File::XML->default_record_format(
                            (
                                     $marcflavour eq 'UNIMARC'
                                  && $record_type eq 'auths'
                            ) ? 'UNIMARCAUTH' : $marcflavour
                        );
                        print MARC::File::XML::header();
                        print "\n";
                        $xml_header_written = 1;
                    }
                    print MARC::File::XML::record($record);
                    print "\n";
                }
                elsif ( $output_format eq 'iso2709' ) {
                    my $errorcount_on_decode = eval { scalar(MARC::File::USMARC->decode( $record->as_usmarc )->warnings()) };
                    if ($errorcount_on_decode or $@){
                        warn $@ if $@;
                        warn "record (number $recordid) is invalid and therefore not exported because its reopening generates warnings above";
                        next;
                    }
                    print $record->as_usmarc();
                }
            }
        }
        if ($xml_header_written) {
            print MARC::File::XML::footer();
            print "\n";
        }
        if ( $output_format eq 'csv' ) {
            my $csv_profile_id = $query->param('csv_profile')
                || GetCsvProfileId( C4::Context->preference('ExportWithCsvProfile') );
            my $output =
              marc2csv( \@recordids,
                $csv_profile_id );

            print $output;
        }

        exit;
    }
    elsif ( $output_format eq "csv" ) {
        my @biblionumbers = uniq $query->param("biblionumbers");
        my @itemnumbers   = $query->param("itemnumbers");
        my $csv_profile_id = $query->param('csv_profile') || GetCsvProfileId( C4::Context->preference('ExportWithCsvProfile') );
        my $output =
          marc2csv( \@biblionumbers,
            $csv_profile_id,
            \@itemnumbers, );
        print $query->header(
            -type                        => 'application/octet-stream',
            -'Content-Transfer-Encoding' => 'binary',
            -attachment                  => "export.csv"
        );
        print $output;
        exit;
    }
}    # if export

else {

    my $itemtypes = GetItemTypes;
    my @itemtypesloop;
    foreach my $thisitemtype ( sort keys %$itemtypes ) {
        my %row = (
            value       => $thisitemtype,
            description => $itemtypes->{$thisitemtype}->{'description'},
        );
        push @itemtypesloop, \%row;
    }
    my $branches = GetBranches($limit_ind_branch);
    my @branchloop;
    for my $thisbranch (
        sort { $branches->{$a}->{branchname} cmp $branches->{$b}->{branchname} }
        keys %{$branches}
      )
    {
        push @branchloop,
          {
            value      => $thisbranch,
            selected   => %branchmap ? $branchmap{$thisbranch} : 1,
            branchname => $branches->{$thisbranch}->{'branchname'},
          };
    }

    my $authtypes = getauthtypes;
    my @authtypesloop;
    foreach my $thisauthtype ( sort keys %$authtypes ) {
        next unless $thisauthtype;
        my %row = (
            value       => $thisauthtype,
            description => $authtypes->{$thisauthtype}->{'authtypetext'},
        );
        push @authtypesloop, \%row;
    }

    if (   $flags->{superlibrarian}
        && C4::Context->config('backup_db_via_tools')
        && $backupdir
        && -d $backupdir )
    {
        $template->{VARS}->{'allow_db_export'} = 1;
        $template->{VARS}->{'dbfiles'}         = getbackupfilelist(
            { directory => "$backupdir", extension => 'sql' } );
    }

    if (   $flags->{superlibrarian}
        && C4::Context->config('backup_conf_via_tools')
        && $backupdir
        && -d $backupdir )
    {
        $template->{VARS}->{'allow_conf_export'} = 1;
        $template->{VARS}->{'conffiles'}         = getbackupfilelist(
            { directory => "$backupdir", extension => 'tar' } );
    }

    $template->param(
        branchloop               => \@branchloop,
        itemtypeloop             => \@itemtypesloop,
        authtypeloop             => \@authtypesloop,
        export_remove_fields     => C4::Context->preference("ExportRemoveFields"),
        csv_profiles             => C4::Csv::GetCsvProfiles('marc'),
    );

    output_html_with_http_headers $query, $cookie, $template->output;
}

sub construct_query {
    my ($params) = @_;

    my ( $sql_query, @sql_params );

    if ( $params->{recordtype} eq "bibs" ) {
        if ( $params->{timestamp} ) {
            my $biblioitemstable = $params->{biblioitemstable};
            $sql_query = " (
                SELECT biblionumber
                FROM $biblioitemstable
                  LEFT JOIN items USING(biblionumber)
                WHERE $biblioitemstable.timestamp >= ?
                  OR items.timestamp >= ?
            ) UNION (
                SELECT biblionumber
                FROM $biblioitemstable
                  LEFT JOIN deleteditems USING(biblionumber)
                WHERE $biblioitemstable.timestamp >= ?
                  OR deleteditems.timestamp >= ?
            ) ";
            my $ts = $timestamp->output('iso');
            @sql_params = ( $ts, $ts, $ts, $ts );
        }
        else {
            my $biblioitemstable     = $params->{biblioitemstable};
            my $itemstable           = $params->{itemstable};
            my $StartingBiblionumber = $params->{StartingBiblionumber};
            my $EndingBiblionumber   = $params->{EndingBiblionumber};
            my @branch               = @{ $params->{branch} };
            my $start_callnumber     = $params->{start_callnumber};
            my $end_callnumber       = $params->{end_callnumber};
            my $start_accession      = $params->{start_accession};
            my $end_accession        = $params->{end_accession};
            my $itemtype             = $params->{itemtype};
            my $items_filter =
                 @branch
              || $start_callnumber
              || $end_callnumber
              || $start_accession
              || $end_accession
              || ( $itemtype && C4::Context->preference('item-level_itypes') );
            $sql_query = $items_filter
              ? "SELECT DISTINCT $biblioitemstable.biblionumber
                FROM $biblioitemstable JOIN $itemstable
                USING (biblionumber) WHERE 1"
              : "SELECT $biblioitemstable.biblionumber FROM $biblioitemstable WHERE biblionumber >0 ";

            if ($StartingBiblionumber) {
                $sql_query .= " AND $biblioitemstable.biblionumber >= ? ";
                push @sql_params, $StartingBiblionumber;
            }

            if ($EndingBiblionumber) {
                $sql_query .= " AND $biblioitemstable.biblionumber <= ? ";
                push @sql_params, $EndingBiblionumber;
            }

            if (@branch) {
                $sql_query .= " AND homebranch IN (".join(',',map({'?'} @branch)).")";
                push @sql_params, @branch;
            }

            if ($start_callnumber) {
                $sql_query .= " AND itemcallnumber >= ? ";
                push @sql_params, $start_callnumber;
            }

            if ($end_callnumber) {
                $sql_query .= " AND itemcallnumber <= ? ";
                push @sql_params, $end_callnumber;
            }
            if ($start_accession) {
                $sql_query .= " AND dateaccessioned >= ? ";
                push @sql_params, $start_accession->output('iso');
            }

            if ($end_accession) {
                $sql_query .= " AND dateaccessioned <= ? ";
                push @sql_params, $end_accession->output('iso');
            }

            if ($itemtype) {
                $sql_query .=
                  ( C4::Context->preference('item-level_itypes') )
                  ? " AND items.itype = ? "
                  : " AND biblioitems.itemtype = ?";
                push @sql_params, $itemtype;
            }
        }
    }
    elsif ( $params->{recordtype} eq "auths" ) {
        if ( $params->{timestamp} ) {

            #TODO
        }
        else {
            my $starting_authid = $params->{starting_authid};
            my $ending_authid   = $params->{ending_authid};
            my $authtype        = $params->{authtype};
            $sql_query =
              "SELECT DISTINCT auth_header.authid FROM auth_header WHERE 1";

            if ($starting_authid) {
                $sql_query .= " AND auth_header.authid >= ? ";
                push @sql_params, $starting_authid;
            }

            if ($ending_authid) {
                $sql_query .= " AND auth_header.authid <= ? ";
                push @sql_params, $ending_authid;
            }

            if ($authtype) {
                $sql_query .= " AND auth_header.authtypecode = ? ";
                push @sql_params, $authtype;
            }
        }
    }
    return ( $sql_query, \@sql_params );
}

sub getbackupfilelist {
    my $args      = shift;
    my $directory = $args->{directory};
    my $extension = $args->{extension};
    my @files;

    if ( opendir( my $dir, $directory ) ) {
        while ( my $file = readdir($dir) ) {
            next unless ( $file =~ m/\.$extension(\.(gz|bz2|xz))?/ );
            push @files, $file
              if ( -f "$directory/$file" && -r "$directory/$file" );
        }
        closedir($dir);
    }
    return \@files;
}

sub download_backup {
    my $args      = shift;
    my $directory = $args->{directory};
    my $extension = $args->{extension};
    my $filename  = $args->{filename};

    return unless ( $directory && -d $directory );
    return unless ( $filename =~ m/\.$extension(\.(gz|bz2|xz))?$/ );
    return if ( $filename =~ m#/# );
    $filename = "$directory/$filename";
    return unless ( -f $filename && -r $filename );
    return unless ( open( my $dump, '<', $filename ) );
    binmode $dump;

    while ( read( $dump, my $data, 64 * 1024 ) ) {
        print $data;
    }
    close($dump);
    return 1;
}