package C4::Heading::MARC21;

# Copyright (C) 2008 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.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

use strict;
use warnings;
use MARC::Record;
use MARC::Field;

our $VERSION = 3.00;

=head1 NAME

C4::Heading::MARC21

=head1 SYNOPSIS

use C4::Heading::MARC21;

=head1 DESCRIPTION

This is an internal helper class used by
C<C4::Heading> to parse headings data from
MARC21 records.  Object of this type
do not carry data, instead, they only
dispatch functions.

=head1 DATA STRUCTURES

FIXME - this should be moved to a configuration file.

=head2 bib_heading_fields

=cut

my $bib_heading_fields = {
    '100' => {
        auth_type  => 'PERSO_NAME',
        subfields  => 'abcdfghjklmnopqrst',
        main_entry => 1
    },
    '110' => {
        auth_type  => 'CORPO_NAME',
        subfields  => 'abcdfghklmnoprst',
        main_entry => 1
    },
    '111' => {
        auth_type  => 'MEETI_NAME',
        subfields  => 'acdfghjklnpqst',
        main_entry => 1
    },
    '130' => {
        auth_type  => 'UNIF_TITLE',
        subfields  => 'adfghklmnoprst',
        main_entry => 1
    },
    '440' => { auth_type => 'UNIF_TITLE', subfields => 'anp', series => 1 },
    '600' => {
        auth_type => 'PERSO_NAME',
        subfields => 'abcdfghjklmnopqrstvxyz',
        subject   => 1
    },
    '610' => {
        auth_type => 'CORPO_NAME',
        subfields => 'abcdfghklmnoprstvxyz',
        subject   => 1
    },
    '611' => {
        auth_type => 'MEETI_NAME',
        subfields => 'acdfghjklnpqstvxyz',
        subject   => 1
    },
    '630' => {
        auth_type => 'UNIF_TITLE',
        subfields => 'adfghklmnoprstvxyz',
        subject   => 1
    },
    '648' => { auth_type => 'CHRON_TERM', subfields => 'avxyz',  subject => 1 },
    '650' => { auth_type => 'TOPIC_TERM', subfields => 'abvxyz', subject => 1 },
    '651' => { auth_type => 'GEOGR_NAME', subfields => 'avxyz',  subject => 1 },
    '655' => { auth_type => 'GENRE/FORM', subfields => 'avxyz',  subject => 1 },
    '700' => { auth_type => 'PERSO_NAME', subfields => 'abcdfghjklmnopqrst' },
    '710' => { auth_type => 'CORPO_NAME', subfields => 'abcdfghklmnoprst' },
    '711' => { auth_type => 'MEETI_NAME', subfields => 'acdfghjklnpqst' },
    '730' => { auth_type => 'UNIF_TITLE', subfields => 'adfghklmnoprst' },
    '800' => {
        auth_type => 'PERSO_NAME',
        subfields => 'abcdfghjklmnopqrst',
        series    => 1
    },
    '810' => {
        auth_type => 'CORPO_NAME',
        subfields => 'abcdfghklmnoprst',
        series    => 1
    },
    '811' =>
      { auth_type => 'MEETI_NAME', subfields => 'acdfghjklnpqst', series => 1 },
    '830' =>
      { auth_type => 'UNIF_TITLE', subfields => 'adfghklmnoprst', series => 1 },
};

=head2 subdivisions

=cut

my %subdivisions = (
    'v' => 'formsubdiv',
    'x' => 'generalsubdiv',
    'y' => 'chronologicalsubdiv',
    'z' => 'geographicsubdiv',
);

=head1 METHODS

=head2 new

  my $marc_handler = C4::Heading::MARC21->new();

=cut

sub new {
    my $class = shift;
    return bless {}, $class;
}

=head2 valid_bib_heading_tag

=cut

sub valid_bib_heading_tag {
    my $self          = shift;
    my $tag           = shift;
    my $frameworkcode = shift;

    if ( exists $bib_heading_fields->{$tag} ) {
        return 1;
    }
    else {
        return 0;
    }

}

=head2 parse_heading

=cut

sub parse_heading {
    my $self  = shift;
    my $field = shift;

    my $tag        = $field->tag;
    my $field_info = $bib_heading_fields->{$tag};

    my $auth_type = $field_info->{'auth_type'};
    my $thesaurus =
      $tag =~ m/6../
      ? _get_subject_thesaurus($field)
      : "lcsh";    # use 'lcsh' for names, UT, etc.
    my $search_heading =
      _get_search_heading( $field, $field_info->{'subfields'} );
    my $display_heading =
      _get_display_heading( $field, $field_info->{'subfields'} );

    return ( $auth_type, $thesaurus, $search_heading, $display_heading,
        'exact' );
}

=head1 INTERNAL FUNCTIONS

=head2 _get_subject_thesaurus

=cut

sub _get_subject_thesaurus {
    my $field = shift;
    my $ind2  = $field->indicator(2);

    my $thesaurus = "notdefined";
    if ( $ind2 eq '0' ) {
        $thesaurus = "lcsh";
    }
    elsif ( $ind2 eq '1' ) {
        $thesaurus = "lcac";
    }
    elsif ( $ind2 eq '2' ) {
        $thesaurus = "mesh";
    }
    elsif ( $ind2 eq '3' ) {
        $thesaurus = "nal";
    }
    elsif ( $ind2 eq '4' ) {
        $thesaurus = "notspecified";
    }
    elsif ( $ind2 eq '5' ) {
        $thesaurus = "cash";
    }
    elsif ( $ind2 eq '6' ) {
        $thesaurus = "rvm";
    }
    elsif ( $ind2 eq '7' ) {
        my $sf2 = $field->subfield('2');
        $thesaurus = $sf2 if defined($sf2);
    }

    return $thesaurus;
}

=head2 _get_search_heading

=cut

sub _get_search_heading {
    my $field     = shift;
    my $subfields = shift;

    my $heading   = "";
    my @subfields = $field->subfields();
    my $first     = 1;
    for ( my $i = 0 ; $i <= $#subfields ; $i++ ) {
        my $code    = $subfields[$i]->[0];
        my $code_re = quotemeta $code;
        my $value   = $subfields[$i]->[1];
        $value =~ s/[-,.:=;!%\/]$//;
        next unless $subfields =~ qr/$code_re/;
        if ($first) {
            $first   = 0;
            $heading = $value;
        }
        else {
            if ( exists $subdivisions{$code} ) {
                $heading .= " $subdivisions{$code} $value";
            }
            else {
                $heading .= " $value";
            }
        }
    }

    # remove characters that are part of CCL syntax
    $heading =~ s/[)(=]//g;

    return $heading;
}

=head2 _get_display_heading

=cut

sub _get_display_heading {
    my $field     = shift;
    my $subfields = shift;

    my $heading   = "";
    my @subfields = $field->subfields();
    my $first     = 1;
    for ( my $i = 0 ; $i <= $#subfields ; $i++ ) {
        my $code    = $subfields[$i]->[0];
        my $code_re = quotemeta $code;
        my $value   = $subfields[$i]->[1];
        next unless $subfields =~ qr/$code_re/;
        if ($first) {
            $first   = 0;
            $heading = $value;
        }
        else {
            if ( exists $subdivisions{$code} ) {
                $heading .= "--$value";
            }
            else {
                $heading .= " $value";
            }
        }
    }
    return $heading;
}

# Additional limiters that we aren't using:
#    if ($self->{'subject_added_entry'}) {
#        $limiters .= " AND Heading-use-subject-added-entry=a";
#    }
#    if ($self->{'series_added_entry'}) {
#        $limiters .= " AND Heading-use-series-added-entry=a";
#    }
#    if (not $self->{'subject_added_entry'} and not $self->{'series_added_entry'}) {
#        $limiters .= " AND Heading-use-main-or-added-entry=a"
#    }

=head1 AUTHOR

Koha Development Team <http://koha-community.org/>

Galen Charlton <galen.charlton@liblime.com>

=cut

1;
