package C4::SearchMarcTest;

# Copyright 2000-2002 Katipo Communications
#
# 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., 59 Temple Place,
# Suite 330, Boston, MA  02111-1307 USA

use strict;
require Exporter;
use DBI;
use C4::Context;
use C4::Biblio;
use C4::Date;
use Date::Manip;

use vars qw($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);

# set the version for version checking
$VERSION = 0.02;

=head1 NAME

C4::Search - Functions for searching the Koha MARC catalog

=head1 FUNCTIONS

This module provides the searching facilities for the Koha MARC catalog

A COPY of official SearchMarc, with some tests for inverted index table
works only with 1 MARC tag/subfield

=cut

@ISA = qw(Exporter);
@EXPORT = qw(&catalogsearch &findseealso &findsuggestion &getMARCnotes &getMARCsubjects);

=head1 findsuggestion($dbh,$values);

=head2 $dbh is a link to the DB handler.

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

=head2 $values is a word

Searches words with the same soundex, ordered by frequency of use.
Useful to suggest other searches to the users.

=cut

sub findsuggestion {
	my ($dbh,$values) = @_;
	my $sth = $dbh->prepare("SELECT count( * ) AS total, word FROM marc_word WHERE sndx_word = soundex( ? ) AND word <> ? GROUP BY word ORDER BY total DESC");
	my @results;
	for(my $i = 0 ; $i <= $#{$values} ; $i++) {
		if (length(@$values[$i]) >=5) {
			$sth->execute(@$values[$i],@$values[$i]);
			my $resfound = 1;
			my @resline;
			while ((my ($count,$word) = $sth->fetchrow) and $resfound <=10) {
				push @results, "@$values[$i]|$word|$count";
#				$results{@$values[$i]} = \@resline;
				$resfound++;
			}
		}
	}
	return \@results;
}

=head1 findseealso($dbh,$fields);

=head2 $dbh is a link to the DB handler.

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

=head2 $fields is a reference to the fields array

This function modify the @$fields array and add related fields to search on.

=cut

sub findseealso {
	my ($dbh, $fields) = @_;
	my $tagslib = MARCgettagslib ($dbh,1);
	for (my $i=0;$i<=$#{$fields};$i++) {
		my ($tag) =substr(@$fields[$i],1,3);
		my ($subfield) =substr(@$fields[$i],4,1);
		@$fields[$i].=','.$tagslib->{$tag}->{$subfield}->{seealso} if ($tagslib->{$tag}->{$subfield}->{seealso});
	}
}

=head1  my ($count, @results) = catalogsearch($dbh, $tags, $and_or, $excluding, $operator, $value, $offset,$length,$orderby);

=head2 $dbh is a link to the DB handler.

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

$tags,$and_or, $excluding, $operator, $value are references to array

=head2 $tags

contains the list of tags+subfields (for example : $@tags[0] = '200a')
A field can be a list of fields : '200f','700a','700b','701a','701b'

Example

=head2 $and_or

contains  a list of strings containing and or or. The 1st value is useless.

=head2 $excluding

contains 0 or 1. If 1, then the request is negated.

=head2 $operator

contains contains,=,start,>,>=,<,<= the = and start work on the complete subfield. The contains operator works on every word in the subfield.

examples :
contains home, search home anywhere.
= home, search a string being home.

=head2 $value

contains the value to search
If it contains a * or a %, then the search is partial.

=head2 $offset and $length

returns $length results, beginning at $offset

=head2 $orderby

define the field used to order the request. Any field in the biblio/biblioitem tables can be used. DESC is possible too

(for example title, title DESC,...)

=head2 RETURNS

returns an array containing hashes. The hash contains all biblio & biblioitems fields and a reference to an item hash. The "item hash contains one line for each callnumber & the number of items related to the callnumber.

=cut

=head2 my $marcnotesarray = &getMARCnotes($dbh,$bibid,$marcflavour);

Returns a reference to an array containing all the notes stored in the MARC database for the given bibid.
$marcflavour ("MARC21" or "UNIMARC") determines which tags are used for retrieving subjects.

=head2 my $marcsubjctsarray = &getMARCsubjects($dbh,$bibid,$marcflavour);

Returns a reference to an array containing all the subjects stored in the MARC database for the given bibid.
$marcflavour ("MARC21" or "UNIMARC") determines which tags are used for retrieving subjects.

=cut

sub catalogsearch {
	my ($dbh, $tags, $and_or, $excluding, $operator, $value, $offset,$length,$orderby,$desc_or_asc) = @_;
	# "Normal" statements
	my @normal_tags = ();
	my @normal_and_or = ();
	my @normal_operator = ();
	my @normal_value = ();
	# Extracts the NOT statements from the list of statements
	my @not_tags = ();
	my @not_and_or = ();
	my @not_operator = ();
	my @not_value = ();
	my $any_not = 0;
	$orderby = "biblio.title" unless $orderby;
	$desc_or_asc = "ASC" unless $desc_or_asc;

# the item.notforloan contains an integer. Every value <>0 means "book unavailable for loan".
# but each library can have it's own table of meaning for each value. Get them
# 1st search if there is a list of authorised values connected to items.notforloan
	my $sth = $dbh->prepare('select authorised_value from marc_subfield_structure where kohafield="items.notforloan"');
	$sth->execute;
	my %notforloanstatus;
	my ($authorised_valuecode) = $sth->fetchrow;
	if ($authorised_valuecode) {
		$sth = $dbh->prepare("select authorised_value,lib from authorised_values where category=?");
		$sth->execute($authorised_valuecode);
		while (my ($authorised_value,$lib) = $sth->fetchrow) {
			$notforloanstatus{$authorised_value} = $lib?$lib:$authorised_value;
		}
	}
#
#
# marc_T_word PROOF OF CONCEPT BEGINNING
#
# fixme : only do a search on "contains every word"
# misses : 
# - begins or is equal to
# - excluding
# - or
	# the global array result.
	my @result;
	for(my $i = 0 ; $i <= $#{$value} ; $i++)
	{
		# replace * by %
		@$value[$i] =~ s/\*/%/g;
		# remove % at the beginning
		@$value[$i] =~ s/^%//g;
	    @$value[$i] =~ s/(\.|\?|\:|\!|\'|,|\-|\"|\(|\)|\[|\]|\{|\}|\/)/ /g if @$operator[$i] eq "contains";
		foreach my $word (split(/ /, @$value[$i]))	# if operator is contains, splits the words in separate requests
			{
			# the array from this word
			my @thiswordresults;
			my $Tquery = $dbh->prepare("select tagsubfield,usedin from marc_Tword where tagsubfield in (@$tags[$i]) and word like ?");
			$Tquery->execute($word);
			warn "EXECUTING select tagsubfield,usedin from marc_Tword where tagsubfield in (@$tags[$i]) and word like $word";
			# get the list of biblionumber - title
			while (my ($tagsubfield,$usedin) = $Tquery->fetchrow) {
# 				warn "$word with ".@$tags[$i]." used in $usedin";
				# split it in an array
				my @lines = split /,/,$usedin;
				# and copy it to an hash.
				foreach my $line (@lines) {
# 					warn "PUSHING $line" if $line; # the if $line avoid pushing the 1st entry, that is empty (usedin begins by a ,)
				 	push @thiswordresults, $line if $line;
				}
			}
			# now, as it's a AND, merge %results & %thiswordresults in 1 hash
			@result = @thiswordresults if $#result<0; #for the 1st loop, fill the global array
			my %intersect;
			my %union;
			my $x; # temp variable
			foreach $x (@result, @thiswordresults) {
				$union{$x}++ && $intersect{$x}++;
			}
			@result = keys %intersect;
		}
	}

	# we have biblionumber array. 
	# now, sort it
	my @result = sort @result;
	
	#Now, loads title and author from [offset] to [offset]+[length]
	my $counter = $offset;
	# HINT : biblionumber as bn is important. The hash is fills biblionumber with items.biblionumber.
	# so if you dont' has an item, you get a not nice empty value.
	$sth = $dbh->prepare("SELECT biblio.biblionumber as bn,biblioitems.*,biblio.*, marc_biblio.bibid,itemtypes.notforloan,itemtypes.description
							FROM biblio, marc_biblio 
							LEFT JOIN biblioitems on biblio.biblionumber = biblioitems.biblionumber
							LEFT JOIN itemtypes on itemtypes.itemtype=biblioitems.itemtype
							WHERE biblio.biblionumber = marc_biblio.biblionumber AND biblio.biblionumber = ?");
#
#
# marc_Tword Proof of concept
#
#
my $subtitle;
	my $sth_subtitle = $dbh->prepare("SELECT subtitle FROM bibliosubtitle WHERE biblionumber=?"); # Added BY JF for Subtitles
	my @finalresult = ();
	my @CNresults=();
	my $totalitems=0;
	my $oldline;
	my ($oldbibid, $oldauthor, $oldtitle);
	my $sth_itemCN = $dbh->prepare("select items.* from items where biblionumber=? and (itemlost = 0 or itemlost is NULL)");
	my $sth_issue = $dbh->prepare("select date_due,returndate from issues where itemnumber=?");
	# parse all biblios between start & end.
	warn "RESULT SIZE : ".$#result;
	while (($counter <= $#result) && ($counter <= ($offset + $length))) {
		# search & parse all items & note itemcallnumber
		# 1st, get the biblionumber
		$result[$counter] =~ /(.*)-(.*)/;
		$sth->execute($2);
		warn "EXECUTING SELECT biblio.biblionumber as bn,biblioitems.*,biblio.*, marc_biblio.bibid,itemtypes.notforloan,itemtypes.description FROM biblio, marc_biblio LEFT JOIN biblioitems on biblio.biblionumber = biblioitems.biblionumber LEFT JOIN itemtypes on itemtypes.itemtype=biblioitems.itemtype WHERE biblio.biblionumber = marc_biblio.biblionumber AND biblio.biblionumber = $2";
		my $continue=1;
		my $line = $sth->fetchrow_hashref;
		my $biblionumber=$line->{bn};
        # Return subtitles first ADDED BY JF
		$sth_subtitle->execute($biblionumber);
		warn "EXECUTING SELECT subtitle FROM bibliosubtitle WHERE biblionumber=$biblionumber";
		my $subtitle_here.= $sth_subtitle->fetchrow." ";
		chop $subtitle_here;
		$subtitle = $subtitle_here;
        # /ADDED BY JF

# 		$continue=0 unless $line->{bn};
# 		my $lastitemnumber;
		$sth_itemCN->execute($biblionumber);
		warn "EXECUTING itemCN select items.* from items where biblionumber=$biblionumber and (itemlost = 0 or itemlost is NULL)";
		my @CNresults = ();
		my $notforloan=1; # to see if there is at least 1 item that can be issued
		while (my $item = $sth_itemCN->fetchrow_hashref) {
			# parse the result, putting holdingbranch & itemcallnumber in separate array
			# then all other fields in the main array
			
			# search if item is on loan
			my $date_due;
			$sth_issue->execute($item->{itemnumber});
			warn "EXECUTING ISSUES select date_due,returndate from issues where itemnumber=".$item->{itemnumber};
			while (my $loan = $sth_issue->fetchrow_hashref) {
				if ($loan->{date_due} and !$loan->{returndate}) {
					$date_due = $loan->{date_due};
				}
			}
			# store this item
			my %lineCN;
			$lineCN{holdingbranch} = $item->{holdingbranch};
			$lineCN{itemcallnumber} = $item->{itemcallnumber};
			$lineCN{location} = $item->{location};
			$lineCN{date_due} = format_date($date_due);
			$lineCN{notforloan} = $notforloanstatus{$line->{notforloan}} if ($line->{notforloan}); # setting not forloan if itemtype is not for loan
			$lineCN{notforloan} = $notforloanstatus{$item->{notforloan}} if ($item->{notforloan}); # setting not forloan it this item is not for loan
			$notforloan=0 unless ($item->{notforloan} or $item->{wthdrawn} or $item->{itemlost});
			push @CNresults,\%lineCN;
			$totalitems++;
		}
		# save the biblio in the final array, with item and item issue status
		my %newline;
		%newline = %$line;
		$newline{totitem} = $totalitems;
		# if $totalitems == 0, check if it's being ordered.
		if ($totalitems == 0) {
			my $sth = $dbh->prepare("select count(*) from aqorders where biblionumber=? and datecancellationprinted is NULL");
			$sth->execute($biblionumber);
			warn "EXECUTING select count(*) from aqorders where biblionumber=$biblionumber and datecancellationprinted is NULL";
			my ($ordered) = $sth->fetchrow;
			$newline{onorder} = 1 if $ordered;
		}
		$newline{biblionumber} = $biblionumber;
		$newline{norequests} = 0;
		$newline{norequests} = 1 if ($line->{notforloan}); # itemtype not issuable
		$newline{norequests} = 1 if (!$line->{notforloan} && $notforloan); # itemtype issuable but all items not issuable for instance
                $newline{subtitle} = $subtitle;  # put the subtitle in ADDED BY JF

		my @CNresults2= @CNresults;
		$newline{CN} = \@CNresults2;
		$newline{'even'} = 1 if $#finalresult % 2 == 0;
		$newline{'odd'} = 1 if $#finalresult % 2 == 1;
		$newline{'timestamp'} = format_date($newline{timestamp});
		@CNresults = ();
		push @finalresult, \%newline;
		$totalitems=0;
		$counter++;
	}
	my $nbresults = $#result+1;
	return (\@finalresult, $nbresults);
}

# Creates the SQL Request

sub create_request {
	my ($dbh,$tags, $and_or, $operator, $value) = @_;

	my $sql_tables; # will contain marc_subfield_table as m1,...
	my $sql_where1; # will contain the "true" where
	my $sql_where2 = "("; # will contain m1.bibid=m2.bibid
	my $nb_active=0; # will contain the number of "active" entries. an entry is active if a value is provided.
	my $nb_table=1; # will contain the number of table. ++ on each entry EXCEPT when an OR  is provided.

	my $maxloop=8; # the maximum number of words to avoid a too complex search.
	$maxloop = @$value if @$value<$maxloop;
	
	for(my $i=0; $i<=$maxloop;$i++) {
		if (@$value[$i]) {
			$nb_active++;
			if ($nb_active==1) {
				if (@$operator[$i] eq "start") {
					$sql_tables .= "marc_subfield_table as m$nb_table,";
					$sql_where1 .= "(m1.subfieldvalue like ".$dbh->quote("@$value[$i]%");
					if (@$tags[$i]) {
						$sql_where1 .=" and concat(m1.tag,m1.subfieldcode) in (@$tags[$i])";
					}
					$sql_where1.=")";
				} elsif (@$operator[$i] eq "contains") {
					$sql_tables .= "marc_word as m$nb_table,";
					$sql_where1 .= "(m1.word  like ".$dbh->quote("@$value[$i]");
					if (@$tags[$i]) {
						 $sql_where1 .=" and m1.tagsubfield in (@$tags[$i])";
					}
					$sql_where1.=")";
				} else {
					$sql_tables .= "marc_subfield_table as m$nb_table,";
					$sql_where1 .= "(m1.subfieldvalue @$operator[$i] ".$dbh->quote("@$value[$i]");
					if (@$tags[$i]) {
						 $sql_where1 .=" and concat(m1.tag,m1.subfieldcode) in (@$tags[$i])";
					}
					$sql_where1.=")";
				}
			} else {
				if (@$operator[$i] eq "start") {
					$nb_table++;
					$sql_tables .= "marc_subfield_table as m$nb_table,";
					$sql_where1 .= "@$and_or[$i] (m$nb_table.subfieldvalue like ".$dbh->quote("@$value[$i]%");
					if (@$tags[$i]) {
					 	$sql_where1 .=" and concat(m$nb_table.tag,m$nb_table.subfieldcode) in (@$tags[$i])";
					}
					$sql_where1.=")";
					$sql_where2 .= "m1.bibid=m$nb_table.bibid and ";
				} elsif (@$operator[$i] eq "contains") {
					if (@$and_or[$i] eq 'and') {
						$nb_table++;
						$sql_tables .= "marc_word as m$nb_table,";
						$sql_where1 .= "@$and_or[$i] (m$nb_table.word like ".$dbh->quote("@$value[$i]");
						if (@$tags[$i]) {
							$sql_where1 .=" and m$nb_table.tagsubfield in(@$tags[$i])";
						}
						$sql_where1.=")";
						$sql_where2 .= "m1.bibid=m$nb_table.bibid and ";
					} else {
						$sql_where1 .= "@$and_or[$i] (m$nb_table.word like ".$dbh->quote("@$value[$i]");
						if (@$tags[$i]) {
							$sql_where1 .="  and m$nb_table.tagsubfield in (@$tags[$i])";
						}
						$sql_where1.=")";
						$sql_where2 .= "m1.bibid=m$nb_table.bibid and ";
					}
				} else {
					$nb_table++;
					$sql_tables .= "marc_subfield_table as m$nb_table,";
					$sql_where1 .= "@$and_or[$i] (m$nb_table.subfieldvalue @$operator[$i] ".$dbh->quote(@$value[$i]);
					if (@$tags[$i]) {
					 	$sql_where1 .="  and concat(m$nb_table.tag,m$nb_table.subfieldcode) in (@$tags[$i])";
					}
					$sql_where2 .= "m1.bibid=m$nb_table.bibid and ";
					$sql_where1.=")";
				}
			}
		}
	}

	if($sql_where2 ne "(")	# some datas added to sql_where2, processing
	{
		$sql_where2 = substr($sql_where2, 0, (length($sql_where2)-5)); # deletes the trailing ' and '
		$sql_where2 .= ")";
	}
	else	# no sql_where2 statement, deleting '('
	{
		$sql_where2 = "";
	}
	chop $sql_tables;	# deletes the trailing ','
	return ($sql_tables, $sql_where1, $sql_where2);
}

sub getMARCnotes {
        my ($dbh, $bibid, $marcflavour) = @_;
	my ($mintag, $maxtag);
	if ($marcflavour eq "MARC21") {
	        $mintag = "500";
		$maxtag = "599";
	} else {           # assume unimarc if not marc21
		$mintag = "300";
		$maxtag = "399";
	}

	my $sth=$dbh->prepare("SELECT subfieldvalue,tag FROM marc_subfield_table WHERE bibid=? AND tag BETWEEN ? AND ? ORDER BY tagorder");

	$sth->execute($bibid,$mintag,$maxtag);

	my @marcnotes;
	my $note = "";
	my $tag = "";
	my $marcnote;

	while (my $data=$sth->fetchrow_arrayref) {
		my $value=$data->[0];
		my $thistag=$data->[1];
		if ($value=~/\.$/) {
		        $value=$value . "  ";
		}
		if ($thistag ne $tag && $note ne "") {
		        $marcnote = {marcnote => $note,};
			push @marcnotes, $marcnote;
			$note=$value;
			$tag=$thistag;
		}
		if ($note ne $value) {
		        $note = $note." ".$value;
		}
	}

	if ($note) {
	        $marcnote = {marcnote => $note};
		push @marcnotes, $marcnote;   #load last tag into array
	}

	$sth->finish;
	$dbh->disconnect;

	my $marcnotesarray=\@marcnotes;
	return $marcnotesarray;
}  # end getMARCnotes


sub getMARCsubjects {
    my ($dbh, $bibid, $marcflavour) = @_;
	my ($mintag, $maxtag);
	if ($marcflavour eq "MARC21") {
	        $mintag = "600";
		$maxtag = "699";
	} else {           # assume unimarc if not marc21
		$mintag = "600";
		$maxtag = "619";
	}
	my $sth=$dbh->prepare("SELECT subfieldvalue,subfieldcode FROM marc_subfield_table WHERE bibid=? AND tag BETWEEN ? AND ? ORDER BY tagorder");

	$sth->execute($bibid,$mintag,$maxtag);

	my @marcsubjcts;
	my $subjct = "";
	my $subfield = "";
	my $marcsubjct;

	while (my $data=$sth->fetchrow_arrayref) {
		my $value = $data->[0];
		my $subfield = $data->[1];
		if ($subfield eq "a" && $value ne $subjct) {
		        $marcsubjct = {MARCSUBJCT => $value,};
			push @marcsubjcts, $marcsubjct;
			$subjct = $value;
		}
	}

	$sth->finish;
	$dbh->disconnect;

	my $marcsubjctsarray=\@marcsubjcts;
        return $marcsubjctsarray;
}  #end getMARCsubjects

END { }       # module clean-up code here (global destructor)

1;
__END__

=back

=head1 AUTHOR

Koha Developement team <info@koha.org>

=cut