#!/usr/bin/perl

# Copyright 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 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 <https://www.gnu.org/licenses>.
#

use Modern::Perl;

use CGI      qw ( -utf8 );
use C4::Auth qw/check_api_auth/;
use C4::Context;
use C4::Koha;
use Koha::ItemTypes;
use XML::Simple;

my $query = CGI->new;

my ( $status, $cookie, $sessionID ) = check_api_auth( $query, { editcatalogue => 'edit_catalogue' } );

if ( $status eq "ok" ) {
    print $query->header( -type => 'text/xml', cookie => $cookie );
} else {
    print $query->header( -type => 'text/xml', -status => '403 Forbidden' );
    print XMLout( { auth_status => $status }, NoAttr => 1, RootName => 'response', XMLDecl => 1 );
    exit 0;
}

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

# get list of required tags
my $result = {};
$result->{'auth_status'} = $status;
_get_mandatory_tags($result);
_get_mandatory_subfields($result);
_get_reserved_tags($result);
_get_bib_number_tag($result);
_get_biblioitem_itemtypes($result);
print XMLout(
    $result, NoAttr => 1, RootName => 'response', XMLDecl => 1,
    GroupTags => {
        mandatory_tags => 'tag', mandatory_subfields => 'subfield', reserved_tags => 'tag',
        valid_values   => 'value'
    }
);

exit 0;

sub _get_mandatory_tags {
    my $result = shift;
    my $sth =
        $dbh->prepare_cached("SELECT tagfield FROM marc_tag_structure WHERE frameworkcode = '' AND mandatory = 1");
    $sth->execute();
    my @tags = ();
    while ( my $row = $sth->fetchrow_arrayref ) {
        push @tags, $row->[0];
    }
    $result->{'mandatory_tags'} = \@tags;
}

sub _get_mandatory_subfields {
    my $result = shift;
    my $sth    = $dbh->prepare_cached(
        "SELECT tagfield, tagsubfield 
                                    FROM marc_subfield_structure 
                                    WHERE frameworkcode = '' 
                                    AND tagsubfield <> '\@' 
                                    AND kohafield <> 'biblioitems.itemtype'
                                    AND mandatory = 1"
    );
    $sth->execute();
    my @subfields = ();
    while ( my $row = $sth->fetchrow_arrayref ) {
        push @subfields, { tag => $row->[0], subfield_label => $row->[1] };
    }
    $result->{'mandatory_subfields'} = \@subfields;
}

sub _get_reserved_tags {
    my $result = shift;
    my $sth    = $dbh->prepare_cached(
        "SELECT DISTINCT tagfield
                                    FROM marc_subfield_structure 
                                    WHERE frameworkcode = '' 
                                    AND (kohafield = 'items.itemnumber' OR kohafield = 'biblioitems.itemtype' OR
                                         kohafield = 'biblio.biblionumber')"
    );
    $sth->execute();
    my @tags = ();
    while ( my $row = $sth->fetchrow_arrayref ) {
        push @tags, $row->[0];
    }
    $result->{'reserved_tags'} = \@tags;
}

sub _get_bib_number_tag {
    my $result = shift;
    my $sth    = $dbh->prepare_cached(
        "SELECT tagfield, tagsubfield
                                    FROM marc_subfield_structure 
                                    WHERE frameworkcode = '' 
                                    AND kohafield = 'biblio.biblionumber'"
    );
    $sth->execute();
    my @tags = ();
    while ( my $row = $sth->fetchrow_arrayref ) {
        push @tags, { tag => $row->[0], subfield => $row->[1] };
    }
    $result->{'bib_number'} = \@tags;
}

sub _get_biblioitem_itemtypes {
    my $result    = shift;
    my $itemtypes = { map { $_->{itemtype} => $_ } @{ Koha::ItemTypes->search_with_localization->unblessed } };
    my $sth       = $dbh->prepare_cached(
        "SELECT tagfield, tagsubfield
                                    FROM marc_subfield_structure 
                                    WHERE frameworkcode = '' 
                                    AND kohafield = 'biblioitems.itemtype'"
    );
    $sth->execute();
    my @tags = ();
    while ( my $row = $sth->fetchrow_arrayref ) {
        push @tags, { tag => $row->[0], subfield => $row->[1] };
    }
    my @valid_values = map { { code => $_, description => $itemtypes->{$_}->{'description'} } } sort keys %$itemtypes;
    $result->{'special_entry'} = { field => \@tags, valid_values => \@valid_values };

}
