package C4::Passwordrecovery;

# Copyright 2014 Solutions InLibro inc.
#
# 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 C4::Context;
use Crypt::Eksblowfish::Bcrypt qw(en_base64);

use vars qw($VERSION @ISA @EXPORT);

BEGIN {
    # set the version for version checking
    $VERSION = 3.07.00.049;
    require Exporter;
    @ISA = qw(Exporter);
    push @EXPORT, qw(
      &ValidateBorrowernumber
      &SendPasswordRecoveryEmail
      &GetValidLinkInfo
      &CompletePasswordRecovery
    );
}

=head1 NAME

C4::Passwordrecovery - Koha password recovery module

=head1 SYNOPSIS

use C4::Passwordrecovery;

=head1 FUNCTIONS

=head2 ValidateBorrowernumber

$alread = ValidateBorrowernumber( $borrower_number );

Check if the system already start recovery

Returns true false

=cut

sub ValidateBorrowernumber {
    my ($borrower_number) = @_;
    my $schema = Koha::Database->new->schema;

    my $rs = $schema->resultset('BorrowerPasswordRecovery')->search(
        {
            borrowernumber => $borrower_number,
            valid_until    => \'> NOW()'
        },
        { columns => 'borrowernumber' }
    );

    if ( $rs->next ) {
        return 1;
    }

    return 0;
}

=head2 GetValidLinkInfo

    Check if the link is still valid and return some info.

=cut

sub GetValidLinkInfo {
    my ($uniqueKey) = @_;
    my $dbh         = C4::Context->dbh;
    my $query       = '
    SELECT borrower_password_recovery.borrowernumber, userid
    FROM borrower_password_recovery, borrowers
    WHERE borrowers.borrowernumber = borrower_password_recovery.borrowernumber
    AND NOW() < valid_until
    AND uuid = ?
    ';
    my $sth = $dbh->prepare($query);
    $sth->execute($uniqueKey);
    return $sth->fetchrow;
}

=head2 SendPasswordRecoveryEmail

 It creates an email using the templates and sends it to the user, using the specified email

=cut

sub SendPasswordRecoveryEmail {
    my $borrower  = shift;    # Koha::Patron
    my $userEmail = shift;    #to_address (the one specified in the request)
    my $update    = shift;

    my $schema = Koha::Database->new->schema;

    # generate UUID
    my @chars = ( "A" .. "Z", "a" .. "z", "0" .. "9" );
    my $uuid_str = '$2a$08$'.en_base64(Koha::AuthUtils::generate_salt('weak', 16));

    # insert into database
    my $expirydate =
      DateTime->now( time_zone => C4::Context->tz() )->add( days => 2 );
    if ($update) {
        my $rs =
          $schema->resultset('BorrowerPasswordRecovery')
          ->search( { borrowernumber => $borrower->borrowernumber, } );
        $rs->update(
            { uuid => $uuid_str, valid_until => $expirydate->datetime() } );
    }
    else {
        my $rs = $schema->resultset('BorrowerPasswordRecovery')->create(
            {
                borrowernumber => $borrower->borrowernumber,
                uuid           => $uuid_str,
                valid_until    => $expirydate->datetime()
            }
        );
    }

    # create link
    my $uuidLink = C4::Context->preference('OPACBaseURL')
      . "/cgi-bin/koha/opac-password-recovery.pl?uniqueKey=$uuid_str";

    # prepare the email
    my $letter = C4::Letters::GetPreparedLetter(
        module      => 'members',
        letter_code => 'PASSWORD_RESET',
        branchcode  => $borrower->branchcode,
        substitute =>
          { passwordreseturl => $uuidLink, user => $borrower->userid },
    );

    # define to/from emails
    my $kohaEmail = C4::Context->preference('KohaAdminEmailAddress');    # from

    C4::Letters::EnqueueLetter(
        {
            letter                 => $letter,
            borrowernumber         => $borrower->borrowernumber,
            to_address             => $userEmail,
            from_address           => $kohaEmail,
            message_transport_type => 'email',
        }
    );

    return 1;
}

=head2 CompletePasswordRecovery

    $bool = CompletePasswordRecovery($uuid);

    Deletes a password recovery entry.

=cut

sub CompletePasswordRecovery {
    my $uniqueKey = shift;
    my $model =
      Koha::Database->new->schema->resultset('BorrowerPasswordRecovery');
    my $entry = $model->search(
        { -or => [ uuid => $uniqueKey, valid_until => \'< NOW()' ] } );
    return $entry->delete();
}

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

1;