package C4::Members::Attributes;

# 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 Text::CSV;      # Don't be tempted to use Text::CSV::Unicode -- even in binary mode it fails.
use C4::Context;
use C4::Members::AttributeTypes;

use vars qw($VERSION @ISA @EXPORT_OK @EXPORT %EXPORT_TAGS);
our ($csv, $AttributeTypes);

BEGIN {
    # set the version for version checking
    $VERSION = 3.01;
    @ISA = qw(Exporter);
    @EXPORT_OK = qw(GetBorrowerAttributes CheckUniqueness SetBorrowerAttributes
                    extended_attributes_code_value_arrayref extended_attributes_merge
					SearchIdMatchingAttribute);
    %EXPORT_TAGS = ( all => \@EXPORT_OK );
}

=head1 NAME

C4::Members::Attributes - manage extend patron attributes

=head1 SYNOPSIS

=over 4

    use C4::Members::Attributes;
    my $attributes = C4::Members::Attributes::GetBorrowerAttributes($borrowernumber);

=back

=head1 FUNCTIONS

=head2 GetBorrowerAttributes

=over 4

my $attributes = C4::Members::Attributes::GetBorrowerAttributes($borrowernumber[, $opac_only]);

=back

Retrieve an arrayref of extended attributes associated with the
patron specified by C<$borrowernumber>.  Each entry in the arrayref
is a hashref containing the following keys:

code (attribute type code)
description (attribute type description)
value (attribute value)
value_description (attribute value description (if associated with an authorised value))
password (password, if any, associated with attribute

If the C<$opac_only> parameter is present and has a true value, only the attributes
marked for OPAC display are returned.

=cut

sub GetBorrowerAttributes {
    my $borrowernumber = shift;
    my $opac_only = @_ ? shift : 0;

    my $dbh = C4::Context->dbh();
    my $query = "SELECT code, description, attribute, lib, password
                 FROM borrower_attributes
                 JOIN borrower_attribute_types USING (code)
                 LEFT JOIN authorised_values ON (category = authorised_value_category AND attribute = authorised_value)
                 WHERE borrowernumber = ?";
    $query .= "\nAND opac_display = 1" if $opac_only;
    $query .= "\nORDER BY code, attribute";
    my $sth = $dbh->prepare_cached($query);
    $sth->execute($borrowernumber);
    my @results = ();
    while (my $row = $sth->fetchrow_hashref()) {
        push @results, {
            code              => $row->{'code'},
            description       => $row->{'description'},
            value             => $row->{'attribute'},  
            value_description => $row->{'lib'},  
            password          => $row->{'password'},
        }
    }
    return \@results;
}

=head2 SearchIdMatchingAttribute

=over 4

my $matching_records = C4::Members::Attributes::SearchIdMatchingAttribute($filter);

=back


=cut

sub SearchIdMatchingAttribute{
    my $filter = shift;

    my $dbh = C4::Context->dbh();
    my $query = qq{
SELECT borrowernumber
FROM borrower_attributes
JOIN borrower_attribute_types USING (code)
WHERE staff_searchable = 1
AND attribute like ?};
    my $sth = $dbh->prepare_cached($query);
    $sth->execute($filter);
	return $sth->fetchall_arrayref;
}

=head2 CheckUniqueness

=over 4

    my $ok = CheckUniqueness($code, $value[, $borrowernumber]);

=back

Given an attribute type and value, verify if would violate
a unique_id restriction if added to the patron.  The
optional C<$borrowernumber> is the patron that the attribute
value would be added to, if known.

Returns false if the C<$code> is not valid or the
value would violate the uniqueness constraint.

=cut

sub CheckUniqueness {
    my $code = shift;
    my $value = shift;
    my $borrowernumber = @_ ? shift : undef;

    my $attr_type = C4::Members::AttributeTypes->fetch($code);

    return 0 unless defined $attr_type;
    return 1 unless $attr_type->unique_id();

    my $dbh = C4::Context->dbh;
    my $sth;
    if (defined($borrowernumber)) {
        $sth = $dbh->prepare("SELECT COUNT(*) 
                              FROM borrower_attributes 
                              WHERE code = ? 
                              AND attribute = ?
                              AND borrowernumber <> ?");
        $sth->execute($code, $value, $borrowernumber);
    } else {
        $sth = $dbh->prepare("SELECT COUNT(*) 
                              FROM borrower_attributes 
                              WHERE code = ? 
                              AND attribute = ?");
        $sth->execute($code, $value);
    }
    my ($count) = $sth->fetchrow_array;
    return ($count == 0);
}

=head2 SetBorrowerAttributes 

=over 4

    SetBorrowerAttributes($borrowernumber, [ { code => 'CODE', value => 'value', password => 'password' }, ... ] );

=back

Set patron attributes for the patron identified by C<$borrowernumber>,
replacing any that existed previously.

=cut

sub SetBorrowerAttributes {
    my $borrowernumber = shift;
    my $attr_list = shift;

    my $dbh = C4::Context->dbh;
    my $delsth = $dbh->prepare("DELETE FROM borrower_attributes WHERE borrowernumber = ?");
    $delsth->execute($borrowernumber);

    my $sth = $dbh->prepare("INSERT INTO borrower_attributes (borrowernumber, code, attribute, password)
                             VALUES (?, ?, ?, ?)");
    foreach my $attr (@$attr_list) {
        $attr->{password} = undef unless exists $attr->{password};
        $sth->execute($borrowernumber, $attr->{code}, $attr->{value}, $attr->{password});
    }
}

=head2 extended_attributes_code_value_arrayref 

=over 4

    my $patron_attributes = "homeroom:1150605,grade:01,extradata:foobar";
    my $aref = extended_attributes_code_value_arrayref($patron_attributes);

=back

Takes a comma-delimited CSV-style string argument and returns the kind of data structure that SetBorrowerAttributes wants, 
namely a reference to array of hashrefs like:
 [ { code => 'CODE', value => 'value' }, { code => 'CODE2', value => 'othervalue' } ... ]

Caches Text::CSV parser object for efficiency.

=cut

sub extended_attributes_code_value_arrayref {
    my $string = shift or return;
    $csv or $csv = Text::CSV->new({binary => 1});  # binary needed for non-ASCII Unicode
    my $ok   = $csv->parse($string);  # parse field again to get subfields!
    my @list = $csv->fields();
    # TODO: error handling (check $ok)
    return [
        sort {&_sort_by_code($a,$b)}
        map { map { my @arr = split /:/, $_, 2; { code => $arr[0], value => $arr[1] } } $_ }
        @list
    ];
    # nested map because of split
}

=head2 extended_attributes_merge

=over 4

    my $old_attributes = extended_attributes_code_value_arrayref("homeroom:224,grade:04,deanslist:2007,deanslist:2008,somedata:xxx");
    my $new_attributes = extended_attributes_code_value_arrayref("homeroom:115,grade:05,deanslist:2009,extradata:foobar");
    my $merged = extended_attributes_merge($patron_attributes, $new_attributes, 1);

    # assuming deanslist is a repeatable code, value same as:
    # $merged = extended_attributes_code_value_arrayref("homeroom:115,grade:05,deanslist:2007,deanslist:2008,deanslist:2009,extradata:foobar,somedata:xxx");

=back

Takes three arguments.  The first two are references to array of hashrefs, each like:
 [ { code => 'CODE', value => 'value' }, { code => 'CODE2', value => 'othervalue' } ... ]

The third option specifies whether repeatable codes are clobbered or collected.  True for non-clobber.

Returns one reference to (merged) array of hashref.

Caches results of C4::Members::AttributeTypes::GetAttributeTypes_hashref(1) for efficiency.

=cut

sub extended_attributes_merge {
    my $old = shift or return;
    my $new = shift or return $old;
    my $keep = @_ ? shift : 0;
    $AttributeTypes or $AttributeTypes = C4::Members::AttributeTypes::GetAttributeTypes_hashref(1);
    my @merged = @$old;
    foreach my $att (@$new) {
        unless ($att->{code}) {
            warn "Cannot merge element: no 'code' defined";
            next;
        }
        unless ($AttributeTypes->{$att->{code}}) {
            warn "Cannot merge element: unrecognized code = '$att->{code}'";
            next;
        }
        unless ($AttributeTypes->{$att->{code}}->{repeatable} and $keep) {
            @merged = grep {$att->{code} ne $_->{code}} @merged;    # filter out any existing attributes of the same code
        }
        push @merged, $att;
    }
    return [( sort {&_sort_by_code($a,$b)} @merged )];
}

sub _sort_by_code {
    my ($x, $y) = @_;
    defined ($x->{code}) or return -1;
    defined ($y->{code}) or return 1;
    return $x->{code} cmp $y->{code} || $x->{value} cmp $y->{value};
}

=head1 AUTHOR

Koha Development Team <info@koha.org>

Galen Charlton <galen.charlton@liblime.com>

=cut

1;