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package RT::Util;
use strict;
use warnings;


use base 'Exporter';
our @EXPORT = qw/safe_run_child mime_recommended_filename/;

sub safe_run_child (&) {
    my $our_pid = $$;

    # situation here is wierd, running external app
    # involves fork+exec. At some point after fork,
    # but before exec (or during) code can die in a
    # child. Local is no help here as die throws
    # error out of scope and locals are reset to old
    # values. Instead we set values, eval code, check pid
    # on failure and reset values only in our original
    # process
    my ($oldv_dbh, $oldv_rth);
    my $dbh = $RT::Handle ? $RT::Handle->dbh : undef;
    $oldv_dbh = $dbh->{'InactiveDestroy'} if $dbh;
    $dbh->{'InactiveDestroy'} = 1 if $dbh;
    $oldv_rth = $RT::Handle->{'DisconnectHandleOnDestroy'} if $RT::Handle;
    $RT::Handle->{'DisconnectHandleOnDestroy'} = 0 if $RT::Handle;

    my ($reader, $writer);
    pipe( $reader, $writer );

    my @res;
    my $want = wantarray;
    eval {
        my $code = shift;
        local @ENV{ 'LANG', 'LC_ALL' } = ( 'C', 'C' );
        unless ( defined $want ) {
            $code->();
        } elsif ( $want ) {
            @res = $code->();
        } else {
            @res = ( scalar $code->() );
        }
        exit 0 if $our_pid != $$;
        1;
    } or do {
        my $err = $@;
        $err =~ s/^Stack:.*$//ms;
        if ( $our_pid == $$ ) {
            $dbh->{'InactiveDestroy'} = $oldv_dbh if $dbh;
            $RT::Handle->{'DisconnectHandleOnDestroy'} = $oldv_rth if $RT::Handle;
            die "System Error: $err";
        } else {
            print $writer "System Error: $err";
            exit 1;
        }
    };

    close($writer);
    $reader->blocking(0);
    my ($response) = $reader->getline;
    warn $response if $response;

    $dbh->{'InactiveDestroy'} = $oldv_dbh if $dbh;
    $RT::Handle->{'DisconnectHandleOnDestroy'} = $oldv_rth if $RT::Handle;
    return $want? (@res) : $res[0];
}

=head2 mime_recommended_filename( MIME::Head|MIME::Entity )

# mimic our own recommended_filename
# since MIME-tools 5.501, head->recommended_filename requires the head are
# mime encoded, we don't meet this yet.

=cut

sub mime_recommended_filename {
    my $head = shift;
    $head = $head->head if $head->isa('MIME::Entity');

    for my $attr_name (qw( content-disposition.filename content-type.name )) {
        my $value = Encode::decode("UTF-8",$head->mime_attr($attr_name));
        if ( defined $value && $value =~ /\S/ ) {
            return $value;
        }
    }
    return;
}

sub assert_bytes {
    my $string = shift;
    return unless utf8::is_utf8($string);
    return unless $string =~ /([^\x00-\x7F])/;

    my $msg;
    if (ord($1) > 255) {
        $msg = "Expecting a byte string, but was passed characters";
    } else {
        $msg = "Expecting a byte string, but was possibly passed charcters;"
            ." if the string is actually bytes, please use utf8::downgrade";
    }
    $RT::Logger->warn($msg, Carp::longmess());

}


RT::Base->_ImportOverlays();

1;
