#!/usr/bin/perl

use DBI;
use LockFile::Simple qw(lock trylock unlock);
use Proc::ProcessTable;
use Data::Dumper qw(Dumper);
use IPC::Run 'run';
use String::Util 'trim';
use File::Temp;
use Try::Tiny;
use sigtrap 'handler' => \&sig_handler, qw(INT TERM KILL QUIT);

my $t = Proc::ProcessTable->new;
my $imapsync_running = grep { $_->{cmndline} =~ /^\/usr\/bin\/perl \/usr\/local\/bin\/imapsync\s/ } @{$t->table};
if ($imapsync_running eq 1)
{
  print "imapsync is active, exiting...";
  exit;
}

$run_dir="/tmp";
$dsn = 'DBI:mysql:database=__DBNAME__;mysql_socket=/var/run/mysqld/mysqld.sock';
$lock_file = $run_dir . "/imapsync_busy";
$lockmgr = LockFile::Simple->make(-autoclean => 1, -max => 1);
$lockmgr->lock($lock_file) || die "can't lock ${lock_file}";
$dbh = DBI->connect($dsn, '__DBUSER__', '__DBPASS__', {
  mysql_auto_reconnect => 1,
  mysql_enable_utf8mb4 => 1
});
sub sig_handler {
  # Send die to force exception in "run"
  die "sig_handler received signal, preparing to exit...\n";
};

open my $file, '<', "/etc/sogo/sieve.creds"; 
my $creds = <$file>; 
close $file;
my ($master_user, $master_pass) = split /:/, $creds;
my $sth = $dbh->prepare("SELECT id,
  user1,
  user2,
  host1,
  authmech1,
  password1,
  exclude,
  port1,
  enc1,
  delete2duplicates,
  maxage,
  subfolder2,
  delete1,
  delete2,
  automap,
  skipcrossduplicates,
  maxbytespersecond,
  custom_params,
  subscribeall,
  timeout1,
  timeout2
    FROM imapsync
      WHERE active = 1
        AND is_running = 0
        AND (
          UNIX_TIMESTAMP(NOW()) - UNIX_TIMESTAMP(last_run) > mins_interval * 60
          OR
          last_run IS NULL)
  ORDER BY last_run");

$sth->execute();
my $row;

while ($row = $sth->fetchrow_arrayref()) {

  $id                  = @$row[0];
  $user1               = @$row[1];
  $user2               = @$row[2];
  $host1               = @$row[3];
  $authmech1           = @$row[4];
  $password1           = @$row[5];
  $exclude             = @$row[6];
  $port1               = @$row[7];
  $enc1                = @$row[8];
  $delete2duplicates   = @$row[9];
  $maxage              = @$row[10];
  $subfolder2          = @$row[11];
  $delete1             = @$row[12];
  $delete2             = @$row[13];
  $automap             = @$row[14];
  $skipcrossduplicates = @$row[15];
  $maxbytespersecond   = @$row[16];
  $custom_params       = @$row[17];
  $subscribeall        = @$row[18];
  $timeout1            = @$row[19];
  $timeout2            = @$row[20];

  $is_running = $dbh->prepare("UPDATE imapsync SET is_running = 1 WHERE id = ?");
  $is_running->bind_param( 1, ${id} );
  $is_running->execute();

  if ($enc1 eq "TLS") { $enc1 = "--tls1"; } elsif ($enc1 eq "SSL") { $enc1 = "--ssl1"; } else { undef $enc1; }

  my $template = $run_dir . '/imapsync.XXXXXXX';
  my $passfile1 = File::Temp->new(TEMPLATE => $template);
  my $passfile2 = File::Temp->new(TEMPLATE => $template);

  print $passfile1 "$password1\n";
  print $passfile2 trim($master_pass) . "\n";

  my $command = "/usr/local/bin/imapsync";
  $command .= " --tmpdir /tmp";
  $command .= " --pidfile /tmp/imapsync.pid";
  $command .= " --nofoldersizes";
  ($timeout1 gt "0" ? () : ($command .= " --timeout1 ${timeout1}"));
  ($timeout2 gt "0" ? () : ($command .= " --timeout2 ${timeout2}"));
  ($exclude eq ""   ? () : ($command .= qq` --exclude ${exclude}`));
  ($subfolder2 eq "" ? () : ($command .= qq` --subfolder2 ${subfolder2}`));
  ($maxage eq "0" ? () : ($command .= " --maxage ${maxage}"));
  ($maxbytespersecond eq "0" ? () : ($command .= " --maxbytespersecond ${maxbytespersecond}"));
  ($delete2duplicates   ne "1" ? () : ($command .= " --delete2duplicates"));
  ($subscribeall    ne "1" ? () : ($command .= " --subscribeall"));
  ($delete1 ne "1" ? () : ($command .= " --delete"));
  ($delete2 ne "1" ? () : ($command .= " --delete2"));
  ($automap ne "1" ? () : ($command .= " --automap"));
  ($skipcrossduplicates ne "1" ? () : ($command .= " --skipcrossduplicates"));
  (!defined($enc1) ? () : ($command .= " ${enc1}"));
  $command .= " --host1 ${host1}";
  $command .= qq` --user1 ${user1}`;
  $command .= " --passfile1 $passfile1->filename";
  $command .= " --port1 ${port1}";
  $command .= " --host2 localhost";
  $command .= " --user2 ${user2}" . '*' . trim($master_user);
  $command .= " --passfile2 $passfile2->filename";
  $command .= " --no-modulesversion";
  ($custom_params eq "" ? () : ($command .= qq` ${custom_params}`));

  try {
    my $stdout = `${command}`
    $update = $dbh->prepare("UPDATE imapsync SET returned_text = ?, last_run = NOW(), is_running = 0 WHERE id = ?");
    $update->bind_param( 1, ${stdout} );
    $update->bind_param( 2, ${id} );
    $update->execute();
  } catch {
    $update = $dbh->prepare("UPDATE imapsync SET returned_text = 'Could not start or finish imapsync', last_run = NOW(), is_running = 0 WHERE id = ?");
    $update->bind_param( 1, ${id} );
    $update->execute();
    $lockmgr->unlock($lock_file);
  };

}

$sth->finish();
$dbh->disconnect();

$lockmgr->unlock($lock_file);