#!/usr/bin/perl

# 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 CGI qw ( -utf8 );
use Digest::MD5 qw( md5_base64 md5_hex );
use String::Random qw( random_string );
use HTML::Entities;

use C4::Auth;
use C4::Output;
use C4::Members;
use C4::Form::MessagingPreferences;
use Koha::Patrons;
use Koha::Patron::Modification;
use Koha::Patron::Modifications;
use C4::Scrubber;
use Email::Valid;
use Koha::DateUtils;
use Koha::Libraries;
use Koha::Patron::Images;
use Koha::Token;

my $cgi = new CGI;
my $dbh = C4::Context->dbh;

my ( $template, $borrowernumber, $cookie ) = get_template_and_user(
    {
        template_name   => "opac-memberentry.tt",
        type            => "opac",
        query           => $cgi,
        authnotrequired => 1,
    }
);

unless ( C4::Context->preference('PatronSelfRegistration') || $borrowernumber )
{
    print $cgi->redirect("/cgi-bin/koha/opac-main.pl");
    exit;
}

my $action = $cgi->param('action') || q{};
if ( $action eq q{} ) {
    if ($borrowernumber) {
        $action = 'edit';
    }
    else {
        $action = 'new';
    }
}

my $mandatory = GetMandatoryFields($action);

my @libraries = Koha::Libraries->search;
if ( my @libraries_to_display = split '\|', C4::Context->preference('PatronSelfRegistrationLibraryList') ) {
    @libraries = map { my $b = $_; my $branchcode = $_->branchcode; grep( /^$branchcode$/, @libraries_to_display ) ? $b : () } @libraries;
}

$template->param(
    action            => $action,
    hidden            => GetHiddenFields( $mandatory, 'registration' ),
    mandatory         => $mandatory,
    libraries         => \@libraries,
    OPACPatronDetails => C4::Context->preference('OPACPatronDetails'),
);

if ( $action eq 'create' ) {

    my %borrower = ParseCgiForBorrower($cgi);

    %borrower = DelEmptyFields(%borrower);

    my @empty_mandatory_fields = CheckMandatoryFields( \%borrower, $action );
    my $invalidformfields = CheckForInvalidFields(\%borrower);
    delete $borrower{'password2'};
    my $cardnumber_error_code;
    if ( !grep { $_ eq 'cardnumber' } @empty_mandatory_fields ) {
        # No point in checking the cardnumber if it's missing and mandatory, it'll just generate a
        # spurious length warning.
        $cardnumber_error_code = checkcardnumber( $borrower{cardnumber}, $borrower{borrowernumber} );
    }

    if ( @empty_mandatory_fields || @$invalidformfields || $cardnumber_error_code ) {
        if ( $cardnumber_error_code == 1 ) {
            $template->param( cardnumber_already_exists => 1 );
        } elsif ( $cardnumber_error_code == 2 ) {
            $template->param( cardnumber_wrong_length => 1 );
        }

        $template->param(
            empty_mandatory_fields => \@empty_mandatory_fields,
            invalid_form_fields    => $invalidformfields,
            borrower               => \%borrower
        );
    }
    elsif (
        md5_base64( uc( $cgi->param('captcha') ) ) ne $cgi->param('captcha_digest') )
    {
        $template->param(
            failed_captcha => 1,
            borrower       => \%borrower
        );
    }
    else {
        if (
            C4::Context->boolean_preference(
                'PatronSelfRegistrationVerifyByEmail')
          )
        {
            ( $template, $borrowernumber, $cookie ) = get_template_and_user(
                {
                    template_name   => "opac-registration-email-sent.tt",
                    type            => "opac",
                    query           => $cgi,
                    authnotrequired => 1,
                }
            );
            $template->param( 'email' => $borrower{'email'} );

            my $verification_token = md5_hex( \%borrower );

            $borrower{password}           = random_string("..........");
            $borrower{verification_token} = $verification_token;

            Koha::Patron::Modification->new( \%borrower )->store();

            #Send verification email
            my $letter = C4::Letters::GetPreparedLetter(
                module      => 'members',
                letter_code => 'OPAC_REG_VERIFY',
                tables      => {
                    borrower_modifications => $verification_token,
                },
            );

            C4::Letters::EnqueueLetter(
                {
                    letter                 => $letter,
                    message_transport_type => 'email',
                    to_address             => $borrower{'email'},
                    from_address =>
                      C4::Context->preference('KohaAdminEmailAddress'),
                }
            );
        }
        else {
            ( $template, $borrowernumber, $cookie ) = get_template_and_user(
                {
                    template_name   => "opac-registration-confirmation.tt",
                    type            => "opac",
                    query           => $cgi,
                    authnotrequired => 1,
                }
            );

            $template->param( OpacPasswordChange =>
                  C4::Context->preference('OpacPasswordChange') );

            my ( $borrowernumber, $password ) = AddMember_Opac(%borrower);
            C4::Form::MessagingPreferences::handle_form_action($cgi, { borrowernumber => $borrowernumber }, $template, 1, C4::Context->preference('PatronSelfRegistrationDefaultCategory') ) if $borrowernumber && C4::Context->preference('EnhancedMessagingPreferences');

            $template->param( password_cleartext => $password );
            $template->param(
                borrower => GetMember( borrowernumber => $borrowernumber ) );
            $template->param(
                PatronSelfRegistrationAdditionalInstructions =>
                  C4::Context->preference(
                    'PatronSelfRegistrationAdditionalInstructions')
            );
        }
    }
}
elsif ( $action eq 'update' ) {

    my $borrower = GetMember( borrowernumber => $borrowernumber );
    die "Wrong CSRF token"
        unless Koha::Token->new->check_csrf({
            id     => $borrower->{userid},
            secret => md5_base64( C4::Context->config('pass') ),
            token  => scalar $cgi->param('csrf_token'),
        });

    my %borrower = ParseCgiForBorrower($cgi);

    my %borrower_changes = DelEmptyFields(%borrower);
    my @empty_mandatory_fields =
      CheckMandatoryFields( \%borrower_changes, $action );
    my $invalidformfields = CheckForInvalidFields(\%borrower);

    # Send back the data to the template
    %borrower = ( %$borrower, %borrower );

    if (@empty_mandatory_fields || @$invalidformfields) {
        $template->param(
            empty_mandatory_fields => \@empty_mandatory_fields,
            invalid_form_fields    => $invalidformfields,
            borrower               => \%borrower,
            csrf_token             => Koha::Token->new->generate_csrf({
                id     => $borrower->{userid},
                secret => md5_base64( C4::Context->config('pass') ),
            }),
        );

        $template->param( action => 'edit' );
    }
    else {
        my %borrower_changes = DelUnchangedFields( $borrowernumber, %borrower );
        if (%borrower_changes) {
            ( $template, $borrowernumber, $cookie ) = get_template_and_user(
                {
                    template_name   => "opac-memberentry-update-submitted.tt",
                    type            => "opac",
                    query           => $cgi,
                    authnotrequired => 1,
                }
            );

            $borrower_changes{borrowernumber} = $borrowernumber;

            # FIXME update the following with
            # Koha::Patron::Modifications->search({ borrowernumber => $borrowernumber })->delete;
            # when bug 17091 will be pushed
            my $patron_modifications = Koha::Patron::Modifications->search({ borrowernumber => $borrowernumber });
            while ( my $patron_modification = $patron_modifications->next ) {
                $patron_modification->delete;
            }

            my $m = Koha::Patron::Modification->new( \%borrower_changes )->store();

            $template->param(
                borrower => GetMember( borrowernumber => $borrowernumber ),
            );
        }
        else {
            $template->param(
                action => 'edit',
                nochanges => 1,
                borrower => GetMember( borrowernumber => $borrowernumber ),
                csrf_token => Koha::Token->new->generate_csrf({
                    id     => $borrower->{userid},
                    secret => md5_base64( C4::Context->config('pass') ),
                }),
            );
        }
    }
}
elsif ( $action eq 'edit' ) {    #Display logged in borrower's data
    my $borrower = GetMember( borrowernumber => $borrowernumber );

    if (C4::Context->preference('ExtendedPatronAttributes')) {
        my $attributes = C4::Members::Attributes::GetBorrowerAttributes($borrowernumber, 'opac');
        if (scalar(@$attributes) > 0) {
            $borrower->{ExtendedPatronAttributes} = 1;
            $borrower->{patron_attributes} = $attributes;
        }
    }

    $template->param(
        borrower  => $borrower,
        guarantor => scalar Koha::Patrons->find($borrowernumber)->guarantor(),
        hidden => GetHiddenFields( $mandatory, 'modification' ),
        csrf_token => Koha::Token->new->generate_csrf({
            id     => $borrower->{userid},
            secret => md5_base64( C4::Context->config('pass') ),
        }),
    );

    if (C4::Context->preference('OPACpatronimages')) {
        my $patron_image = Koha::Patron::Images->find($borrower->{borrowernumber});
        $template->param( display_patron_image => 1 ) if $patron_image;
    }

}

my $captcha = random_string("CCCCC");

$template->param(
    captcha        => $captcha,
    captcha_digest => md5_base64($captcha)
);

output_html_with_http_headers $cgi, $cookie, $template->output, undef, { force_no_caching => 1 };

sub GetHiddenFields {
    my ( $mandatory, $action ) = @_;
    my %hidden_fields;

    my $BorrowerUnwantedField = $action eq 'modification' ?
      C4::Context->preference( "PatronSelfModificationBorrowerUnwantedField" ) :
      C4::Context->preference( "PatronSelfRegistrationBorrowerUnwantedField" );

    my @fields = split( /\|/, $BorrowerUnwantedField || q|| );
    foreach (@fields) {
        next unless m/\w/o;
        #Don't hide mandatory fields
        next if $mandatory->{$_};
        $hidden_fields{$_} = 1;
    }

    return \%hidden_fields;
}

sub GetMandatoryFields {
    my ($action) = @_;

    my %mandatory_fields;

    my $BorrowerMandatoryField =
      C4::Context->preference("PatronSelfRegistrationBorrowerMandatoryField");

    my @fields = split( /\|/, $BorrowerMandatoryField );

    foreach (@fields) {
        $mandatory_fields{$_} = 1;
    }

    if ( $action eq 'create' || $action eq 'new' ) {
        $mandatory_fields{'email'} = 1
          if C4::Context->boolean_preference(
            'PatronSelfRegistrationVerifyByEmail');
    }

    return \%mandatory_fields;
}

sub CheckMandatoryFields {
    my ( $borrower, $action ) = @_;

    my @empty_mandatory_fields;

    my $mandatory_fields = GetMandatoryFields($action);
    delete $mandatory_fields->{'cardnumber'};

    foreach my $key ( keys %$mandatory_fields ) {
        push( @empty_mandatory_fields, $key )
          unless ( defined( $borrower->{$key} ) && $borrower->{$key} );
    }

    return @empty_mandatory_fields;
}

sub CheckForInvalidFields {
    my $minpw = C4::Context->preference('minPasswordLength');
    my $borrower = shift;
    my @invalidFields;
    if ($borrower->{'email'}) {
        unless ( Email::Valid->address($borrower->{'email'}) ) {
            push(@invalidFields, "email");
        } elsif ( C4::Context->preference("PatronSelfRegistrationEmailMustBeUnique") ) {
            my $patrons_with_same_email = Koha::Patrons->search( { email => $borrower->{email} })->count;
            if ( $patrons_with_same_email ) {
                push @invalidFields, "duplicate_email";
            }
        }
    }
    if ($borrower->{'emailpro'}) {
        push(@invalidFields, "emailpro") if (!Email::Valid->address($borrower->{'emailpro'}));
    }
    if ($borrower->{'B_email'}) {
        push(@invalidFields, "B_email") if (!Email::Valid->address($borrower->{'B_email'}));
    }
    if ( $borrower->{'password'} ne $borrower->{'password2'} ){
        push(@invalidFields, "password_match");
    }
    if ( $borrower->{'password'}  && $minpw && (length($borrower->{'password'}) < $minpw) ) {
       push(@invalidFields, "password_invalid");
    }
    if ( $borrower->{'password'} ) {
       push(@invalidFields, "password_spaces") if ($borrower->{'password'} =~ /^\s/ or $borrower->{'password'} =~ /\s$/);
    }

    return \@invalidFields;
}

sub ParseCgiForBorrower {
    my ($cgi) = @_;

    my $scrubber = C4::Scrubber->new();
    my %borrower;

    foreach ( $cgi->param ) {
        if ( $_ =~ '^borrower_' ) {
            my ($key) = substr( $_, 9 );
            $borrower{$key} = HTML::Entities::encode( $scrubber->scrub( scalar $cgi->param($_) ) );
        }
    }

    my $dob_dt;
    $dob_dt = eval { dt_from_string( $borrower{'dateofbirth'} ); }
        if ( $borrower{'dateofbirth'} );

    if ( $dob_dt ) {
        $borrower{'dateofbirth'} = output_pref ( { dt => $dob_dt, dateonly => 1, dateformat => 'iso' } );
    }
    else {
        # Trigger validation
        $borrower{'dateofbirth'} = undef;
    }

    return %borrower;
}

sub DelUnchangedFields {
    my ( $borrowernumber, %new_data ) = @_;

    my $current_data = GetMember( borrowernumber => $borrowernumber );

    foreach my $key ( keys %new_data ) {
        if ( $current_data->{$key} eq $new_data{$key} ) {
            delete $new_data{$key};
        }
    }

    return %new_data;
}

sub DelEmptyFields {
    my (%borrower) = @_;

    foreach my $key ( keys %borrower ) {
        delete $borrower{$key} unless $borrower{$key};
    }

    return %borrower;
}