package WebGUI::Search::Index;

=head1 LEGAL

 -------------------------------------------------------------------
  WebGUI is Copyright 2001-2009 Plain Black Corporation.
 -------------------------------------------------------------------
  Please read the legal notices (docs/legal.txt) and the license
  (docs/license.txt) that came with this distribution before using
  this software.
 -------------------------------------------------------------------
  http://www.plainblack.com                     info@plainblack.com
 -------------------------------------------------------------------

=cut

use strict;
use HTML::Entities;

=head1 NAME

Package WebGUI::Search::Index

=head1 DESCRIPTION

A package for working with the WebGUI Search Engine.

=head1 SYNOPSIS

 use WebGUI::Search::Index;

=head1 METHODS

These methods are available from this package:

=cut


#-------------------------------------------------------------------

=head2 addFile ( path ) 

Use an external filter defined in the config file as searchIndexerPlugins.

=head3 path

The path to the filename to index, including the filename.

=cut

sub addFile {
    my $self = shift;
    my $path = shift;
    my $filters = $self->session->config->get("searchIndexerPlugins");
    my $content;
    if ($path =~ m/\.(\w+)$/) {
        my $type = lc($1);
        if ($filters->{$type}) {
            open my $fh, "$filters->{$type} $path |" or return undef; # open pipe to filter
            $content = do { local $/; <$fh> };  # slurp file
            close $fh;
        }
    }
    return $self->addKeywords($content)
        if $content =~ m/\S/; # only index if we fine non-whitespace
    return undef;
}


#-------------------------------------------------------------------

=head2 addKeywords ( text )

Add more text to the keywords index for this asset.

=head3 text

A string (or array of strings) of text. You may optionally also put HTML here, and it will be automatically filtered.

=cut

sub addKeywords {
	my $self = shift;
	my $text = join(" ", @_);

    $text = $self->_filterKeywords($text);
	my ($keywords) = $self->session->db->quickArray("select keywords from assetIndex where assetId=?",[$self->getId]);
	$self->session->db->write("update assetIndex set keywords =? where assetId=?", [$keywords.' '.$text, $self->getId]);
}


#-------------------------------------------------------------------

=head2 asset ( )

Returns a reference to the asset object we're indexing.

=cut

sub asset {
	my $self = shift;
	return $self->{_asset};
}


#-------------------------------------------------------------------

=head2 create ( asset )

Constructor that also creates the initial index of an asset.

=cut

sub create {
	my $class = shift;
	my $asset = shift;
	my $self = $class->new($asset);
	$self->delete;

	my $url = $asset->get("url");
	$url =~ s/\/|\-|\_/ /g;

	my $description = WebGUI::HTML::filter($asset->get('description'), "all");
    my $keywords = join(" ",$asset->get("title"), $asset->get("menuTitle"), $asset->get("synopsis"), $url,
        $description, WebGUI::Keyword->new($self->session)->getKeywordsForAsset({asset=>$asset}));
    $keywords = $self->_filterKeywords($keywords);

	my $synopsis = $asset->get("synopsis") || substr($description,0,255);
	my $add = $self->session->db->prepare("insert into assetIndex (assetId, title, url, creationDate, revisionDate, 
		ownerUserId, groupIdView, groupIdEdit, lineage, className, synopsis, keywords) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ? )");
	$add->execute([$asset->getId, $asset->get("title"), $asset->get("url"), $asset->get("creationDate"),
		$asset->get("revisionDate"), $asset->get("ownerUserId"), $asset->get("groupIdView"), $asset->get("groupIdEdit"), 
		$asset->get("lineage"), $asset->get("className"), $synopsis, $keywords]);
	return $self;
}


#-------------------------------------------------------------------

=head2 delete ( )

Deletes this indexed asset.

=cut

sub delete {
	my $self = shift;
	my $delete = $self->session->db->prepare("delete from assetIndex where assetId=?");
	$delete->execute([$self->getId]);
}

#-------------------------------------------------------------------

=head2 _filterKeywords ( $keywords )

Perform filtering and cleaning up of the keywords before submitting them.  Ideographic characters are padded
so that they are still searchable.  HTML entities are decoded.

=head3 $keywords

A string containing keywords.

=cut

sub _filterKeywords {
    my $self     = shift;
    my $keywords = shift;

    $keywords = WebGUI::HTML::filter($keywords, "all");
    $keywords = HTML::Entities::decode_entities($keywords);
    utf8::upgrade($keywords);

    # split into 'words'.  Ideographic characters (such as Chinese) are
    # treated as distinct words.  Everything else is space delimited.
    my @words = grep { $_ ne '' } split /\s+|(\p{Ideographic})/, $keywords;

    # remove punctuation characters at the start and end of each word.
    for my $word ( @words ) {
        $word =~ s/\A\p{isPunct}+//;
        $word =~ s/\p{isPunct}+\z//;
        # we add padding to ideographic characters to avoid minimum word length limits on indexing
        if ($word =~ /\p{Ideographic}/) {
            $word = q{''}.$word.q{''};
        }
    }

    $keywords = join q{ }, @words;
    return $keywords;
}

#-------------------------------------------------------------------

=head2 getId ( )

Returns the ID used to create this object.

=cut

sub getId {
	my $self = shift;
	return $self->{_id};
}

#-------------------------------------------------------------------

=head2 setIsPublic ( boolean )

Sets the status of whether this asset will appear in public searches.

=cut

sub setIsPublic {
	my $self = shift;
	my $boolean = shift;
	my $set = $self->session->db->prepare("update assetIndex set isPublic=? where assetId=?");
	$set->execute([$boolean, $self->getId]);
}

#-------------------------------------------------------------------

=head2 new ( asset )

Constructor.

=head3 asset

A reference to an asset object.

=cut

sub new {
	my $class = shift;
	my $asset = shift;
	my $self = {_asset=>$asset, _session=>$asset->session, _id=>$asset->getId};
	bless $self, $class;
}


#-------------------------------------------------------------------

=head2 session ( )

Returns a reference to the current session.

=cut

sub session {
	my $self = shift;
	return $self->{_session};
}

#-------------------------------------------------------------------

=head2 updateSynopsis ( text )

Overrides the asset's default synopsis with a new chunk of text.

NOTE: This doesn't change the asset itself, only the synopsis in the search index.

=head3 text

The text to put in place of the current synopsis.

=cut

sub updateSynopsis {
	my $self = shift;
	my $text = shift;
	my $add = $self->session->db->prepare("update assetIndex set synopsis=? where assetId=?");
	$add->execute([$text,$self->getId]);
}



1;