package Koha::PseudonymizedTransaction;

# 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 Modern::Perl;

use Crypt::Eksblowfish::Bcrypt qw( bcrypt );

use Koha::Database;
use Koha::Exceptions::Config;
use Koha::Patrons;

use base qw(Koha::Object);

=head1 NAME

Koha::PseudonymizedTransaction - Koha Koha::PseudonymizedTransaction Object class

=head1 API

=head2 Class methods

=head3 new_from_statistic

    Creates new object from a passed Koha::Statistic object

=cut

sub new_from_statistic {
    my ( $class, $statistic ) = @_;

    my $values = {
        hashed_borrowernumber => $class->get_hash($statistic->borrowernumber),
    };

    my @t_fields_to_copy = split ',', C4::Context->preference('PseudonymizationTransactionFields') || '';

    if ( grep { $_ eq 'transaction_branchcode' } @t_fields_to_copy ) {
        $values->{transaction_branchcode} = $statistic->branch;
    }
    if ( grep { $_ eq 'holdingbranch' } @t_fields_to_copy ) {
        $values->{holdingbranch} = $statistic->item->holdingbranch;
    }
    if ( grep { $_ eq 'homebranch' } @t_fields_to_copy ) {
        $values->{homebranch} = $statistic->item->homebranch;
    }
    if ( grep { $_ eq 'transaction_type' } @t_fields_to_copy ) {
        $values->{transaction_type} = $statistic->type;
    }
    if ( grep { $_ eq 'itemcallnumber' } @t_fields_to_copy ) {
        $values->{itemcallnumber} = $statistic->item->itemcallnumber;
    }


    @t_fields_to_copy = grep {
             $_ ne 'transaction_branchcode'
          && $_ ne 'holdingbranch'
          && $_ ne 'homebranch'
          && $_ ne 'transaction_type'
          && $_ ne 'itemcallnumber'
    } @t_fields_to_copy;

    $values = { %$values, map { $_ => $statistic->$_ } @t_fields_to_copy };

    my $patron = Koha::Patrons->find($statistic->borrowernumber);
    my @p_fields_to_copy = split ',', C4::Context->preference('PseudonymizationPatronFields') || '';
    $values = { %$values, map { $_ => $patron->$_ } @p_fields_to_copy };

    $values->{branchcode} = $patron->branchcode; # FIXME Must be removed from the pref options, or FK removed (?)
    $values->{categorycode} = $patron->categorycode;

    $values->{has_cardnumber} = $patron->cardnumber ? 1 : 0;

    my $self = $class->SUPER::new($values);

    my $extended_attributes = $patron->extended_attributes->unblessed;
    for my $attribute (@$extended_attributes) {
        next unless Koha::Patron::Attribute::Types->find(
            $attribute->{code} )->keep_for_pseudonymization;

        delete $attribute->{id};
        delete $attribute->{borrowernumber};

        $self->_result->create_related('pseudonymized_borrower_attributes', $attribute);
    }

    return $self;
}

=head3 get_hash

    Generates a hashed value for $s (e.g. borrowernumber) with Bcrypt.
    Needs config entry 'bcrypt_settings' in koha-conf.

=cut

sub get_hash {
    my ( $class, $s ) = @_;
    my $bcrypt_settings = C4::Context->config('bcrypt_settings');

    Koha::Exceptions::Config::MissingEntry->throw(
        "Missing 'bcrypt_settings' entry in config file") unless $bcrypt_settings;

    return bcrypt($s, $bcrypt_settings);
}

=head2 Internal methods

=head3 _type

=cut

sub _type {
    return 'PseudonymizedTransaction';
}

1;