package C4::Koha;

# Copyright 2000-2002 Katipo Communications
# Parts Copyright 2010 Nelsonville Public Library
# Parts copyright 2010 BibLibre
#
# 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 base 'Exporter';

BEGIN {
    our @EXPORT_OK = qw(
        GetItemTypesCategorized
        getallthemes
        getFacets
        getImageSets
        getnbpages
        getitemtypeimagedir
        getitemtypeimagesrc
        getitemtypeimagelocation
        GetAuthorisedValues
        GetNormalizedISBN
        xml_escape

        GetVariationsOfISBN
        GetVariationsOfISBNs
        NormalizeISBN
        GetVariationsOfISSN
        GetVariationsOfISSNs
        NormalizeISSN

    );
}

use C4::Context;
use Koha::Caches;
use Koha::AuthorisedValues;
use Koha::Libraries;
use Koha::MarcSubfieldStructures;
use Business::ISBN;
use Business::ISSN;

=head1 NAME

C4::Koha - Perl Module containing convenience functions for Koha scripts

=head1 SYNOPSIS

use C4::Koha;

=head1 DESCRIPTION

Koha.pm provides many functions for Koha scripts.

=head1 FUNCTIONS

=cut

=head2 GetItemTypesCategorized

    $categories = GetItemTypesCategorized();

Returns a hashref containing search categories.
A search category will be put in the hash if at least one of its itemtypes is visible in OPAC.
The categories must be part of Authorized Values (ITEMTYPECAT)

=cut

sub GetItemTypesCategorized {
    my $dbh = C4::Context->dbh;

    # Order is important, so that partially hidden (some items are not visible in OPAC) search
    # categories will be visible. hideinopac=0 must be last.
    my $query = q|
        SELECT itemtype, description, imageurl, hideinopac, 0 as 'iscat' FROM itemtypes WHERE ISNULL(searchcategory) or length(searchcategory) = 0
        UNION
        SELECT DISTINCT searchcategory AS `itemtype`,
                        COALESCE(authorised_values.lib_opac,authorised_values.lib) AS description,
                        authorised_values.imageurl AS imageurl,
                        hideinopac, 1 as 'iscat'
        FROM itemtypes
        LEFT JOIN authorised_values ON searchcategory = authorised_value
        WHERE searchcategory > '' and hideinopac=1
        AND category = 'ITEMTYPECAT'
        UNION
        SELECT DISTINCT searchcategory AS `itemtype`,
                        COALESCE(authorised_values.lib_opac,authorised_values.lib) AS description,
                        authorised_values.imageurl AS imageurl,
                        hideinopac, 1 as 'iscat'
        FROM itemtypes
        LEFT JOIN authorised_values ON searchcategory = authorised_value
        WHERE searchcategory > '' and hideinopac=0
        AND category = 'ITEMTYPECAT'
        |;
    return ( $dbh->selectall_hashref( $query, 'itemtype' ) );
}

=head2 getitemtypeimagedir

  my $directory = getitemtypeimagedir( 'opac' );

pass in 'opac' or 'intranet'. Defaults to 'opac'.

returns the full path to the appropriate directory containing images.

=cut

sub getitemtypeimagedir {
    my $src = shift || 'opac';
    if ( $src eq 'intranet' ) {
        return C4::Context->config('intrahtdocs') . '/' . C4::Context->preference('template') . '/img/itemtypeimg';
    } else {
        return C4::Context->config('opachtdocs') . '/' . C4::Context->preference('opacthemes') . '/itemtypeimg';
    }
}

=head2 getitemtypeimagesrc

Missing POD for getitemtypeimagesrc.

=cut

sub getitemtypeimagesrc {
    my $src = shift || 'opac';
    if ( $src eq 'intranet' ) {
        return '/intranet-tmpl' . '/' . C4::Context->preference('template') . '/img/itemtypeimg';
    } else {
        return '/opac-tmpl' . '/' . C4::Context->preference('opacthemes') . '/itemtypeimg';
    }
}

=head2 getitemtypeimagelocation

Missing POD for getitemtypeimagelocation.

=cut

sub getitemtypeimagelocation {
    my ( $src, $image ) = @_;

    return '' if ( !$image );
    require URI::Split;

    my $scheme = ( URI::Split::uri_split($image) )[0];

    return $image if ($scheme);

    return getitemtypeimagesrc($src) . '/' . $image;
}

=head3 _getImagesFromDirectory

Find all of the image files in a directory in the filesystem

parameters: a directory name

returns: a list of images in that directory.

Notes: this does not traverse into subdirectories. See
_getSubdirectoryNames for help with that.
Images are assumed to be files with .gif or .png file extensions.
The image names returned do not have the directory name on them.

=cut

sub _getImagesFromDirectory {
    my $directoryname = shift;
    return unless defined $directoryname;
    return unless -d $directoryname;

    if ( opendir( my $dh, $directoryname ) ) {
        my @images = grep { /\.(gif|png)$/i } readdir($dh);
        closedir $dh;
        @images = sort(@images);
        return @images;
    } else {
        warn "unable to opendir $directoryname: $!";
        return;
    }
}

=head3 _getSubdirectoryNames

Find all of the directories in a directory in the filesystem

parameters: a directory name

returns: a list of subdirectories in that directory.

Notes: this does not traverse into subdirectories. Only the first
level of subdirectories are returned.
The directory names returned don't have the parent directory name on them.

=cut

sub _getSubdirectoryNames {
    my $directoryname = shift;
    return unless defined $directoryname;
    return unless -d $directoryname;

    if ( opendir( my $dh, $directoryname ) ) {
        my @directories = grep { -d File::Spec->catfile( $directoryname, $_ ) && !(/^\./) } readdir($dh);
        closedir $dh;
        return @directories;
    } else {
        warn "unable to opendir $directoryname: $!";
        return;
    }
}

=head3 getImageSets

returns: a listref of hashrefs. Each hash represents another collection of images.

 { imagesetname => 'npl', # the name of the image set (npl is the original one)
         images => listref of image hashrefs
 }

each image is represented by a hashref like this:

 { KohaImage     => 'npl/image.gif',
   StaffImageUrl => '/intranet-tmpl/prog/img/itemtypeimg/npl/image.gif',
   OpacImageURL  => '/opac-tmpl/prog/itemtypeimg/npl/image.gif'
   checked       => 0 or 1: was this the image passed to this method?
                    Note: I'd like to remove this somehow.
 }

=cut

sub getImageSets {
    my %params  = @_;
    my $checked = $params{'checked'} || '';

    my $paths = {
        staff => {
            filesystem => getitemtypeimagedir('intranet'),
            url        => getitemtypeimagesrc('intranet'),
        },
        opac => {
            filesystem => getitemtypeimagedir('opac'),
            url        => getitemtypeimagesrc('opac'),
        }
    };

    my @imagesets      = ();    # list of hasrefs of image set data to pass to template
    my @subdirectories = _getSubdirectoryNames( $paths->{'staff'}{'filesystem'} );
    foreach my $imagesubdir (@subdirectories) {
        my @imagelist = ();     # hashrefs of image info
        my @imagenames =
            _getImagesFromDirectory( File::Spec->catfile( $paths->{'staff'}{'filesystem'}, $imagesubdir ) );
        my $imagesetactive = 0;
        foreach my $thisimage (@imagenames) {
            push(
                @imagelist,
                {
                    KohaImage     => "$imagesubdir/$thisimage",
                    StaffImageUrl => join( '/', $paths->{'staff'}{'url'}, $imagesubdir, $thisimage ),
                    OpacImageUrl  => join( '/', $paths->{'opac'}{'url'},  $imagesubdir, $thisimage ),
                    checked       => "$imagesubdir/$thisimage" eq $checked ? 1 : 0,
                }
            );
            $imagesetactive = 1 if "$imagesubdir/$thisimage" eq $checked;
        }
        push @imagesets, {
            imagesetname   => $imagesubdir,
            imagesetactive => $imagesetactive,
            images         => \@imagelist
        };

    }
    return \@imagesets;
}

=head2 getnbpages

Returns the number of pages to display in a pagination bar, given the number
of items and the number of items per page.

=cut

sub getnbpages {
    my ( $nb_items, $nb_items_per_page ) = @_;

    return int( ( $nb_items - 1 ) / $nb_items_per_page ) + 1;
}

=head2 getallthemes

  (@themes) = &getallthemes('opac');
  (@themes) = &getallthemes('intranet');

Returns an array of all available themes.

=cut

sub getallthemes {
    my $type = shift;
    my $htdocs;
    my @themes;
    if ( $type eq 'intranet' ) {
        $htdocs = C4::Context->config('intrahtdocs');
    } else {
        $htdocs = C4::Context->config('opachtdocs');
    }
    my $dir_h;
    opendir $dir_h, "$htdocs";
    my @dirlist = readdir $dir_h;
    foreach my $directory (@dirlist) {
        next if $directory eq 'lib';
        -d "$htdocs/$directory/en" and push @themes, $directory;
    }
    close $dir_h;
    return @themes;
}

=head2 getFacets

Missing POD for getFacets.

=cut

sub getFacets {
    my $facets;
    if ( C4::Context->preference("marcflavour") eq "UNIMARC" ) {
        $facets = [
            {
                idx   => 'su-to',
                label => 'Topics',
                tags  => [qw/ 600ab 601ab 602a 604at 605a 606ax 610a /],
                sep   => ' - ',
            },
            {
                idx   => 'su-geo',
                label => 'Places',
                tags  => [qw/ 607a /],
                sep   => ' - ',
            },
            {
                idx   => 'au',
                label => 'Authors',
                tags  => [qw/ 700ab 701ab 702ab /],
                sep   => C4::Context->preference("UNIMARCAuthorsFacetsSeparator"),
            },
            {
                idx   => 'se',
                label => 'Series',
                tags  => [qw/ 225a /],
                sep   => ', ',
            },
            {
                idx   => 'location',
                label => 'Location',
                tags  => [qw/ 995e /],
            },
            {
                idx   => 'ccode',
                label => 'Collections',
                tags  => [qw / 099t 955h /],
            }
        ];

        unless ( Koha::Libraries->search->count == 1 ) {
            my $DisplayLibraryFacets = C4::Context->preference('DisplayLibraryFacets');
            if (   $DisplayLibraryFacets eq 'both'
                || $DisplayLibraryFacets eq 'holding' )
            {
                push(
                    @$facets,
                    {
                        idx   => 'holdingbranch',
                        label => 'Holding libraries',
                        tags  => [qw / 995c /],
                    }
                );
            }

            if (   $DisplayLibraryFacets eq 'both'
                || $DisplayLibraryFacets eq 'home' )
            {
                push(
                    @$facets,
                    {
                        idx   => 'homebranch',
                        label => 'Home libraries',
                        tags  => [qw / 995b /],
                    }
                );
            }
        }
    } else {
        $facets = [
            {
                idx   => 'su-to',
                label => 'Topics',
                tags  => [qw/ 650a /],
                sep   => '--',
            },

            #        {
            #        idx   => 'su-na',
            #        label => 'People and Organizations',
            #        tags  => [ qw/ 600a 610a 611a / ],
            #        sep   => 'a',
            #        },
            {
                idx   => 'su-geo',
                label => 'Places',
                tags  => [qw/ 651a /],
                sep   => '--',
            },
            {
                idx   => 'su-ut',
                label => 'Titles',
                tags  => [qw/ 630a /],
                sep   => '--',
            },
            {
                idx   => 'au',
                label => 'Authors',
                tags  => [qw/ 100a 110a 700a /],
                sep   => ', ',
            },
            {
                idx   => 'se',
                label => 'Series',
                tags  => [qw/ 440a 490a /],
                sep   => ', ',
            },
            {
                idx   => 'itype',
                label => 'Item types',
                tags  => [qw/ 952y 942c /],
                sep   => ', ',
            },
            {
                idx   => 'location',
                label => 'Location',
                tags  => [qw / 952c /],
            },
            {
                idx   => 'ccode',
                label => 'Collections',
                tags  => [qw / 9528 /],
            }
        ];

        unless ( Koha::Libraries->search->count == 1 ) {
            my $DisplayLibraryFacets = C4::Context->preference('DisplayLibraryFacets');
            if (   $DisplayLibraryFacets eq 'both'
                || $DisplayLibraryFacets eq 'holding' )
            {
                push(
                    @$facets,
                    {
                        idx   => 'holdingbranch',
                        label => 'Holding libraries',
                        tags  => [qw / 952b /],
                    }
                );
            }

            if (   $DisplayLibraryFacets eq 'both'
                || $DisplayLibraryFacets eq 'home' )
            {
                push(
                    @$facets,
                    {
                        idx   => 'homebranch',
                        label => 'Home libraries',
                        tags  => [qw / 952a /],
                    }
                );
            }
        }
    }
    return $facets;
}

=head2 GetAuthorisedValues

  $authvalues = GetAuthorisedValues([$category]);

This function returns all authorised values from the'authorised_value' table in a reference to array of hashrefs.

C<$category> returns authorised values for just one category (optional).

C<$opac> If set to a true value, displays OPAC descriptions rather than normal ones when they exist.

=cut

sub GetAuthorisedValues {
    my $category = shift // '';      # optional parameter
    my $opac     = shift ? 1 : 0;    # normalise to be safe

    # Is this cached already?
    my $branch_limit = C4::Context::mybranch();
    my $cache_key    = "AuthorisedValues-$category-$opac-$branch_limit";
    my $cache        = Koha::Caches->get_instance();
    my $result       = $cache->get_from_cache($cache_key);
    return $result if $result;

    my @results;
    my $dbh   = C4::Context->dbh;
    my $query = qq{
        SELECT DISTINCT av.*
        FROM authorised_values av
    };
    $query .= qq{
          LEFT JOIN authorised_values_branches ON ( id = av_id )
    } if $branch_limit;
    my @where_strings;
    my @where_args;

    if ($category) {
        push @where_strings, "category = ?";
        push @where_args,    $category;
    }
    if ($branch_limit) {
        push @where_strings, "( branchcode = ? OR branchcode IS NULL )";
        push @where_args,    $branch_limit;
    }
    if ( @where_strings > 0 ) {
        $query .= " WHERE " . join( " AND ", @where_strings );
    }
    $query .= ' ORDER BY category, '
        . (
        $opac
        ? 'COALESCE(lib_opac, lib)'
        : 'lib, lib_opac'
        );

    my $sth = $dbh->prepare($query);

    $sth->execute(@where_args);
    while ( my $data = $sth->fetchrow_hashref ) {
        if ( $opac && $data->{lib_opac} ) {
            $data->{lib} = $data->{lib_opac};
        }
        push @results, $data;
    }
    $sth->finish;

    $cache->set_in_cache( $cache_key, \@results, { expiry => 5 } );
    return \@results;
}

=head2 xml_escape

  my $escaped_string = C4::Koha::xml_escape($string);

Convert &, <, >, ', and " in a string to XML entities

=cut

sub xml_escape {
    my $str = shift;
    return '' unless defined $str;
    $str =~ s/&/&amp;/g;
    $str =~ s/</&lt;/g;
    $str =~ s/>/&gt;/g;
    $str =~ s/'/&apos;/g;
    $str =~ s/"/&quot;/g;
    return $str;
}

=head2 display_marc_indicators

  my $display_form = C4::Koha::display_marc_indicators($field);

C<$field> is a MARC::Field object

Generate a display form of the indicators of a variable
MARC field, replacing any blanks with '#'.

=cut

sub display_marc_indicators {
    my $field      = shift;
    my $indicators = '';
    if ( $field && $field->tag() >= 10 ) {
        $indicators = $field->indicator(1) . $field->indicator(2);
        $indicators =~ s/ /#/g;
    }
    return $indicators;
}

# Normalizes and returns the first valid ISBN found in the record
# ISBN13 are converted into ISBN10. This is required to get some book cover images.

=head2 GetNormalizedISBN

Missing POD for GetNormalizedISBN.

=cut

sub GetNormalizedISBN {
    my ( $isbn, $marcrecord, $marcflavour ) = @_;
    if ($isbn) {

        # Koha attempts to store multiple ISBNs in biblioitems.isbn, separated by " | "
        # anything after " | " should be removed, along with the delimiter
        ($isbn) = split( /\|/, $isbn );
        return _isbn_cleanup($isbn);
    }

    return unless $marcrecord;

    if ( $marcflavour eq 'UNIMARC' ) {
        my @fields = $marcrecord->field('010');
        foreach my $field (@fields) {
            my $isbn = $field->subfield('a');
            if ($isbn) {
                return _isbn_cleanup($isbn);
            }
        }
    } else {    # assume marc21 if not unimarc
        my @fields = $marcrecord->field('020');
        foreach my $field (@fields) {
            $isbn = $field->subfield('a');
            if ($isbn) {
                return _isbn_cleanup($isbn);
            }
        }
    }
}

sub _normalize_match_point {
    my $match_point = shift;
    ( my $normalized_match_point ) = $match_point =~ /([\d-]*[X]*)/;
    $normalized_match_point =~ s/-//g;

    return $normalized_match_point;
}

sub _isbn_cleanup {
    my ($isbn) = @_;

    return unless $isbn;

    if ( $isbn =~ /^979/ ) {

        # ISBNs starting with 979 cannot be converted to ISBN-10 format, but all other valid ISBNs can
        return NormalizeISBN(
            {
                isbn          => $isbn,
                format        => 'ISBN-13',
                strip_hyphens => 1,
            }
        );
    } else {
        return NormalizeISBN(
            {
                isbn          => $isbn,
                format        => 'ISBN-10',
                strip_hyphens => 1,
            }
        );
    }
}

=head2 NormalizeISBN

  my $isbns = NormalizeISBN({
    isbn => $isbn,
    strip_hyphens => [0,1],
    format => ['ISBN-10', 'ISBN-13']
  });

  Returns an isbn validated by Business::ISBN.
  Optionally strips hyphens and/or forces the isbn
  to be of the specified format.

  If the string cannot be validated as an isbn,
  it returns nothing unless return_invalid param is passed.

  #FIXME This routine (and others?) should be moved to Koha::Util::Normalize

=cut

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

    my $string         = $params->{isbn};
    my $strip_hyphens  = $params->{strip_hyphens};
    my $format         = $params->{format} || q{};
    my $return_invalid = $params->{return_invalid};

    return unless $string;

    my $isbn = Business::ISBN->new($string);

    if ( $isbn && $isbn->is_valid() ) {

        if ( $format eq 'ISBN-10' ) {
            $isbn = $isbn->as_isbn10();
        } elsif ( $format eq 'ISBN-13' ) {
            $isbn = $isbn->as_isbn13();
        }
        return unless $isbn;

        if ($strip_hyphens) {
            $string = $isbn->as_string( [] );
        } else {
            $string = $isbn->as_string();
        }

        return $string;
    } elsif ($return_invalid) {
        return $string;
    }

}

=head2 GetVariationsOfISBN

  my @isbns = GetVariationsOfISBN( $isbn );

  Returns a list of variations of the given isbn in
  both ISBN-10 and ISBN-13 formats, with and without
  hyphens.

  In a scalar context, the isbns are returned as a
  string delimited by ' | '.

=cut

sub GetVariationsOfISBN {
    my ($isbn) = @_;

    return unless $isbn;

    my @isbns;

    push( @isbns, NormalizeISBN( { isbn => $isbn, return_invalid => 1 } ) );
    push( @isbns, NormalizeISBN( { isbn => $isbn, format         => 'ISBN-10' } ) );
    push( @isbns, NormalizeISBN( { isbn => $isbn, format         => 'ISBN-13' } ) );
    push( @isbns, NormalizeISBN( { isbn => $isbn, format         => 'ISBN-10', strip_hyphens => 1 } ) );
    push( @isbns, NormalizeISBN( { isbn => $isbn, format         => 'ISBN-13', strip_hyphens => 1 } ) );

    # Strip out any "empty" strings from the array
    @isbns = grep { defined($_) && $_ =~ /\S/ } @isbns;

    return wantarray ? @isbns : join( " | ", @isbns );
}

=head2 GetVariationsOfISBNs

  my @isbns = GetVariationsOfISBNs( @isbns );

  Returns a list of variations of the given isbns in
  both ISBN-10 and ISBN-13 formats, with and without
  hyphens.

  In a scalar context, the isbns are returned as a
  string delimited by ' | '.

=cut

sub GetVariationsOfISBNs {
    my (@isbns) = @_;

    @isbns = map { GetVariationsOfISBN($_) } @isbns;

    return wantarray ? @isbns : join( " | ", @isbns );
}

=head2 NormalizedISSN

  my $issns = NormalizedISSN({
          issn => $issn,
          strip_hyphen => [0,1]
          });

  Returns an issn validated by Business::ISSN.
  Optionally strips hyphen.

  If the string cannot be validated as an issn,
  it returns nothing.

=cut

=head2 NormalizeISSN

Missing POD for NormalizeISSN.

=cut

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

    my $string       = $params->{issn};
    my $strip_hyphen = $params->{strip_hyphen};

    my $issn = Business::ISSN->new($string);

    if ( $issn && $issn->is_valid ) {

        if ($strip_hyphen) {
            $string = $issn->_issn;
        } else {
            $string = $issn->as_string;
        }
        return $string;
    }

}

=head2 GetVariationsOfISSN

  my @issns = GetVariationsOfISSN( $issn );

  Returns a list of variations of the given issn in
  with and without a hyphen.

  In a scalar context, the issns are returned as a
  string delimited by ' | '.

=cut

sub GetVariationsOfISSN {
    my ($issn) = @_;

    return unless $issn;

    my @issns;
    my $str = NormalizeISSN( { issn => $issn } );
    if ($str) {
        push @issns, $str;
        push @issns, NormalizeISSN( { issn => $issn, strip_hyphen => 1 } );
    } else {
        push @issns, $issn;
    }

    # Strip out any "empty" strings from the array
    @issns = grep { defined($_) && $_ =~ /\S/ } @issns;

    return wantarray ? @issns : join( " | ", @issns );
}

=head2 GetVariationsOfISSNs

  my @issns = GetVariationsOfISSNs( @issns );

  Returns a list of variations of the given issns in
  with and without a hyphen.

  In a scalar context, the issns are returned as a
  string delimited by ' | '.

=cut

sub GetVariationsOfISSNs {
    my (@issns) = @_;

    @issns = map { GetVariationsOfISSN($_) } @issns;

    return wantarray ? @issns : join( " | ", @issns );
}

1;

__END__

=head1 AUTHOR

Koha Team

=cut