package C4::Review;

# 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 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 <http://www.gnu.org/licenses>.

use strict;
use warnings;

use C4::Context;

use vars qw(@ISA @EXPORT);

BEGIN {
    require Exporter;
    @ISA    = qw(Exporter);
    @EXPORT = qw(getreview savereview updatereview numberofreviews numberofreviewsbybiblionumber
      getreviews getallreviews approvereview unapprovereview deletereview);
}

=head1 NAME

C4::Review - Perl Module containing routines for dealing with reviews of items

=head1 SYNOPSIS

  use C4::Review;

  my $review=getreview($biblionumber,$borrowernumber);
  savereview($biblionumber,$borrowernumber,$review);
  updatereview($biblionumber,$borrowernumber,$review);
  my $count=numberofreviews($status);
  my $count=numberofreviewsbybiblionumber($biblionumber);
  my $reviews=getreviews($biblionumber, $status);
  my $reviews=getallreviews($status, [$offset], [$row_count]);

=head1 DESCRIPTION

Review.pm provides many routines for manipulating reviews.

=head1 FUNCTIONS

=head2 getreview

  $review = getreview($biblionumber,$borrowernumber);

Takes a borrowernumber and a biblionumber and returns the review of that biblio

=cut

sub getreview {
    my ( $biblionumber, $borrowernumber ) = @_;
    my $dbh   = C4::Context->dbh;
    my $query = "SELECT * FROM reviews WHERE biblionumber=? and borrowernumber=?";
    my $sth   = $dbh->prepare($query);
    $sth->execute( $biblionumber, $borrowernumber );
    return $sth->fetchrow_hashref();
}

=head2 savereview

  savereview($biblionumber,$borrowernumber, $review);

Save a review in the 'reviews' database

=cut

sub savereview {
    my ( $biblionumber, $borrowernumber, $review ) = @_;
    my $dbh   = C4::Context->dbh;
    my $query = "INSERT INTO reviews (borrowernumber,biblionumber,
  review,approved,datereviewed) VALUES
  (?,?,?,0,now())";
    my $sth = $dbh->prepare($query);
    $sth->execute( $borrowernumber, $biblionumber, $review );
}

=head2 updatereview

  updateview($biblionumber,$borrowernumber, $review);

Update the review description in the 'reviews' database

=cut

sub updatereview {
    my ( $biblionumber, $borrowernumber, $review ) = @_;
    my $dbh   = C4::Context->dbh;
    my $query = "UPDATE reviews SET review=?,datereviewed=now(),approved=0  WHERE borrowernumber=? and biblionumber=?";
    my $sth   = $dbh->prepare($query);
    $sth->execute( $review, $borrowernumber, $biblionumber );
}

=head2 numberofreviews

  my $count=numberofreviews( [$status] );

Return the number of reviews where in the 'reviews' database : 'approved' = $status
(By default $status = 1)

=cut

sub numberofreviews {
    my ($param) = @_;
    my $status = ( defined($param) ? $param : 1 );
    my $dbh    = C4::Context->dbh;
    my $query  = "SELECT count(*) FROM reviews WHERE approved=?";
    my $sth    = $dbh->prepare($query);
    $sth->execute($status);
    return $sth->fetchrow;
}

=head2 numberofreviewsbybiblionumber

  my $count=numberofreviewsbybiblionumber($biblionumber);

Return the number of reviews approved for a given biblionumber

=cut

sub numberofreviewsbybiblionumber {
    my ($biblionumber) = @_;
    my $dbh            = C4::Context->dbh;
    my $query          = "SELECT count(*) FROM reviews WHERE biblionumber=? and approved=?";
    my $sth            = $dbh->prepare($query);
    $sth->execute( $biblionumber, 1 );
    return $sth->fetchrow;
}

=head2 getreviews

  my $reviews=getreviews($biblionumber, $status);

Return all reviews where in the 'reviews' database :
'biblionumber' = $biblionumber and 'approved' = $status

=cut

sub getreviews {
    my ( $biblionumber, $approved ) = @_;
    my $dbh   = C4::Context->dbh;
    my $query = "SELECT * FROM reviews WHERE biblionumber=? and approved=? order by datereviewed desc";
    my $sth   = $dbh->prepare($query);
    $sth->execute( $biblionumber, $approved );
    return $sth->fetchall_arrayref( {} );
}

=head2 getallreviews

  my $reviews=getallreviews($status, [$offset], [$row_count]);

Return all reviews where in the 'reviews' database : 'approved' = $status

If offset and row_count are fiven, it's return all reviews between the
$offset position and the ($offset + $row_count) position.
(By default : $offset = 0 and $row_count = 20)

=cut

sub getallreviews {
    my ( $status, $offset, $row_count ) = @_;
    my @params = ( $status, ( $offset ? $offset : 0 ), ( $row_count ? $row_count : 20 ) );
    my $dbh    = C4::Context->dbh;
    my $query  = "SELECT * FROM reviews WHERE approved=? order by datereviewed desc LIMIT ?, ?";
    my $sth    = $dbh->prepare($query);
    $sth->execute(@params);
    return $sth->fetchall_arrayref( {} );
}

=head2 approvereview

  approvereview($reviewid);

Takes a reviewid and marks that review approved

=cut

sub approvereview {
    my ($reviewid) = @_;
    my $dbh        = C4::Context->dbh();
    my $query      = "UPDATE reviews
               SET approved=?
               WHERE reviewid=?";
    my $sth = $dbh->prepare($query);
    $sth->execute( 1, $reviewid );
}

=head2 unapprovereview

  unapprovereview($reviewid);

Takes a reviewid and marks that review as not approved

=cut

sub unapprovereview {
    my ($reviewid) = @_;
    my $dbh        = C4::Context->dbh();
    my $query      = "UPDATE reviews
               SET approved=?
               WHERE reviewid=?";
    my $sth = $dbh->prepare($query);
    $sth->execute( 0, $reviewid );
}

=head2 deletereview

  deletereview($reviewid);

Takes a reviewid and deletes it

=cut

sub deletereview {
    my ($reviewid) = @_;
    my $dbh        = C4::Context->dbh();
    my $query      = "DELETE FROM reviews
               WHERE reviewid=?";
    my $sth = $dbh->prepare($query);
    $sth->execute($reviewid);
}

1;
__END__

=head1 AUTHOR

Koha Team

=cut