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#!/usr/bin/perl


use List::MoreUtils qw(any);

use strict;

my $exe_dir;

BEGIN {
use FindBin;
use lib "$FindBin::Bin/..";

use SL::System::Process;
$exe_dir = SL::System::Process::exe_dir;

unshift @INC, "${exe_dir}/modules/override"; # Use our own versions of various modules (e.g. YAML).
push @INC, "${exe_dir}/modules/fallback"; # Only use our own versions of modules if there's no system version.
unshift @INC, $exe_dir;

chdir($exe_dir) || die "Cannot change directory to ${exe_dir}\n";
}

use CGI qw( -no_xhtml);
use Cwd;
use Daemon::Generic;
use Data::Dumper;
use DateTime;
use Encode qw();
use English qw(-no_match_vars);
use File::Spec;
use List::Util qw(first);
use POSIX qw(setuid setgid);
use SL::Auth;
use SL::DB::BackgroundJob;
use SL::BackgroundJob::ALL;
use SL::Form;
use SL::Helper::DateTime;
use SL::InstanceConfiguration;
use SL::LXDebug;
use SL::LxOfficeConf;
use SL::Locale;
use SL::Mailer;
use SL::System::TaskServer;
use Template;

our %lx_office_conf;

sub debug {
return if !$lx_office_conf{task_server}->{debug};
$::lxdebug->message(0, @_);
}

sub lxinit {
my $login = $lx_office_conf{task_server}->{login};
my $client = $lx_office_conf{task_server}->{client};

package main;

$::lxdebug = LXDebug->new;
$::locale = Locale->new($::lx_office_conf{system}->{language});
$::form = Form->new;
$::auth = SL::Auth->new;
die "No client configured or no client found with the name/ID '$client'" unless $::auth->set_client($client);
$::instance_conf = SL::InstanceConfiguration->new;
$::request = { cgi => CGI->new({}) };

die 'cannot reach auth db' unless $::auth->session_tables_present;

$::auth->restore_session;

require "bin/mozilla/common.pl";

die "cannot find user $login" unless %::myconfig = $::auth->read_user(login => $login);
die "cannot find locale for user $login" unless $::locale = Locale->new('de');
}

sub per_job_initialization {
$::locale = Locale->new($::myconfig{countrycode} || $::lx_office_conf{system}->{language});
$::form = Form->new;
$::instance_conf = SL::InstanceConfiguration->new;
$::request = SL::Request->new(
cgi => CGI->new({}),
layout => SL::Layout::None->new,
);

$::auth->restore_session;

$::form->{login} = $lx_office_conf{task_server}->{login};
$::instance_conf->init;
}

sub drop_privileges {
my $user = $lx_office_conf{task_server}->{run_as};
return unless $user;

my ($uid, $gid);
while (my @details = getpwent()) {
next unless $details[0] eq $user;
($uid, $gid) = @details[2, 3];
last;
}
endpwent();

if (!$uid) {
print "Error: Cannot drop privileges to ${user}: user does not exist\n";
exit 1;
}

if (!setgid($gid)) {
print "Error: Cannot drop group privileges to ${user} (group ID $gid): $!\n";
exit 1;
}

if (!setuid($uid)) {
print "Error: Cannot drop user privileges to ${user} (user ID $uid): $!\n";
exit 1;
}
}

sub notify_on_failure {
my (%params) = @_;

my $cfg = $lx_office_conf{'task_server/notify_on_failure'} || {};

return if any { !$cfg->{$_} } qw(send_email_to email_from email_subject email_template);

chdir $exe_dir;

return debug("Template " . $cfg->{email_template} . " missing!") unless -f $cfg->{email_template};

my $email_to = $cfg->{send_email_to};
if ($email_to !~ m{\@}) {
my %user = $::auth->read_user(login => $email_to);
return debug("cannot find user for notification $email_to") unless %user;

$email_to = $user{email};
return debug("user for notification " . $user{login} . " doesn't have a valid email address") unless $email_to =~ m{\@};
}

my $template = Template->new({
INTERPOLATE => 0,
EVAL_PERL => 0,
ABSOLUTE => 1,
CACHE_SIZE => 0,
});

return debug("Could not create Template instance") unless $template;

$params{client} = $::auth->client;

my $body;
$template->process($cfg->{email_template}, \%params, \$body);

Mailer->new(
from => $cfg->{email_from},
to => $email_to,
subject => $cfg->{email_subject},
content_type => 'text/plain',
charset => 'utf-8',
message => Encode::decode('utf-8', $body),
)->send;
}

sub gd_preconfig {
my $self = shift;

SL::LxOfficeConf->read($self->{configfile});

die "Missing section [task_server] in config file" unless $lx_office_conf{task_server};
die "Missing key 'login' in section [task_server] in config file" unless $lx_office_conf{task_server}->{login};
die "Missing key 'client' in section [task_server] in config file" unless $lx_office_conf{task_server}->{client};

drop_privileges();
lxinit();

return ();
}

sub gd_run {
while (1) {
my $ok = eval {
debug("Retrieving jobs");

my $jobs = SL::DB::Manager::BackgroundJob->get_all_need_to_run;

debug(" Found: " . join(' ', map { $_->package_name } @{ $jobs })) if @{ $jobs };

foreach my $job (@{ $jobs }) {
# Provide fresh global variables in case legacy code modifies
# them somehow.
per_job_initialization();

chdir $exe_dir;

my $history = $job->run;

notify_on_failure(history => $history) if $history && $history->has_failed;
}

1;
};

if (!$ok) {
my $error = $EVAL_ERROR;
debug("Exception during execution: ${error}");
notify_on_failure(exception => $error);
}

debug("Sleeping");

my $seconds = 60 - (localtime)[0];
if (!eval {
local $SIG{'ALRM'} = sub {
debug("Got woken up by SIGALRM");
die "Alarm!\n"
};
sleep($seconds < 30 ? $seconds + 60 : $seconds);
1;
}) {
die $@ unless $@ eq "Alarm!\n";
}
}
}

chdir $exe_dir;

mkdir SL::System::TaskServer::PID_BASE() if !-d SL::System::TaskServer::PID_BASE();

my $file = first { -f } ("${exe_dir}/config/kivitendo.conf", "${exe_dir}/config/lx_office.conf", "${exe_dir}/config/kivitendo.conf.default");

die "No configuration file found." unless $file;

$file = File::Spec->abs2rel(Cwd::abs_path($file), Cwd::abs_path($exe_dir));

newdaemon(configfile => $file,
progname => 'kivitendo-background-jobs',
pidbase => SL::System::TaskServer::PID_BASE() . '/',
);

1;
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