#!/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 C4::Auth qw( get_template_and_user );
use C4::Output qw( output_and_exit output_html_with_http_headers );

use Koha::Patrons;
use Koha::Auth::TwoFactorAuth;
use Koha::Token;

my $cgi = CGI->new;

my ( $template, $loggedinuser, $cookie ) = get_template_and_user(
    {
        template_name => 'members/two_factor_auth.tt',
        query         => $cgi,
        type          => 'intranet',
        flagsrequired => { editcatalogue => '*' },
    }
);

unless ( C4::Context->preference('TwoFactorAuthentication') ) {
    print $cgi->redirect("/cgi-bin/koha/errors/404.pl");
    exit;
}

my $logged_in_user = Koha::Patrons->find($loggedinuser);
my $op             = $cgi->param('op') // '';

if ( !C4::Context->config('encryption_key') ) {
    $template->param( missing_key => 1 );
}
else {

    my $csrf_pars = {
        session_id => scalar $cgi->cookie('CGISESSID'),
        token      => scalar $cgi->param('csrf_token'),
    };

    if ( $op eq 'register-2FA' ) {
        output_and_exit( $cgi, $cookie, $template, 'wrong_csrf_token' )
          unless Koha::Token->new->check_csrf($csrf_pars);

        my $pin_code = $cgi->param('pin_code');
        my $secret32 = $cgi->param('secret32');
        my $auth     = Koha::Auth::TwoFactorAuth->new(
            { patron => $logged_in_user, secret32 => $secret32 } );

        my $verified = $auth->verify(
            $pin_code,
            1,        # range
            $secret32,
            undef,    # timestamp (defaults to now)
            30,       # interval (default 30)
        );

        if ($verified) {

            # FIXME Generate a (new?) secret
            $logged_in_user->encode_secret($secret32);
            $logged_in_user->auth_method('two-factor')->store;
            $op = 'registered';
            if ( $logged_in_user->notice_email_address ) {
                $logged_in_user->queue_notice(
                    {
                        letter_params => {
                            module      => 'members',
                            letter_code => '2FA_ENABLE',
                            branchcode  => $logged_in_user->branchcode,
                            lang        => $logged_in_user->lang,
                            tables      => {
                                branches  => $logged_in_user->branchcode,
                                borrowers => $logged_in_user->id
                            },
                        },
                        message_transports => ['email'],
                    }
                );
            }
        }
        else {
            $template->param( invalid_pin => 1, );
            $op = 'enable-2FA';
        }
    }

    if ( $op eq 'enable-2FA' ) {
        my $secret = Koha::AuthUtils::generate_salt( 'weak', 16 );
        my $auth   = Koha::Auth::TwoFactorAuth->new(
            { patron => $logged_in_user, secret => $secret } );

        $template->param(
            issuer   => $auth->issuer,
            key_id   => $auth->key_id,
            qr_code  => $auth->qr_code,
            secret32 => $auth->secret32,

            # IMPORTANT: get secret32 after qr_code call !
        );
        $auth->clear;
        $op = 'register';
    }
    elsif ( $op eq 'disable-2FA' ) {
        output_and_exit( $cgi, $cookie, $template, 'wrong_csrf_token' )
          unless Koha::Token->new->check_csrf($csrf_pars);
        my $auth =
          Koha::Auth::TwoFactorAuth->new( { patron => $logged_in_user } );
        $logged_in_user->secret(undef);
        $logged_in_user->auth_method('password')->store;
        if ( $logged_in_user->notice_email_address ) {
            $logged_in_user->queue_notice(
                {
                    letter_params => {
                        module      => 'members',
                        letter_code => '2FA_DISABLE',
                        branchcode  => $logged_in_user->branchcode,
                        lang        => $logged_in_user->lang,
                        tables      => {
                            branches  => $logged_in_user->branchcode,
                            borrowers => $logged_in_user->id
                        },
                    },
                    message_transports => ['email'],
                }
            );
        }
    }
}

$template->param(
    csrf_token => Koha::Token->new->generate_csrf(
        { session_id => scalar $cgi->cookie('CGISESSID') }
    ),
    patron => $logged_in_user,
    op     => $op,
);

output_html_with_http_headers $cgi, $cookie, $template->output;