package DBIx::Class::Storage::DBI::Sybase;

use strict;
use warnings;
use Try::Tiny;

use base qw/DBIx::Class::Storage::DBI/;

=head1 NAME

DBIx::Class::Storage::DBI::Sybase - Base class for drivers using
L<DBD::Sybase>

=head1 DESCRIPTION

This is the base class/dispatcher for Storage's designed to work with
L<DBD::Sybase>

=head1 METHODS

=cut

sub _rebless {
  my $self = shift;

  my $dbtype;
  try {
    $dbtype = @{$self->_get_dbh->selectrow_arrayref(qq{sp_server_info \@attribute_id=1})}[2]
  } catch {
    $self->throw_exception("Unable to estable connection to determine database type: $_")
  };

  if ($dbtype) {
    $dbtype =~ s/\W/_/gi;

    # saner class name
    $dbtype = 'ASE' if $dbtype eq 'SQL_Server';

    my $subclass = __PACKAGE__ . "::$dbtype";
    if ($self->load_optional_class($subclass)) {
      bless $self, $subclass;
      $self->_rebless;
    }
  }
}

sub _ping {
  my $self = shift;

  my $dbh = $self->_dbh or return 0;

  local $dbh->{RaiseError} = 1;
  local $dbh->{PrintError} = 0;

  if ($dbh->{syb_no_child_con}) {
# if extra connections are not allowed, then ->ping is reliable
    my $alive;
    try { $alive = $dbh->ping } catch { $alive = 0 };
    return $alive;
  }

  my $rc = 1;
  try {
# XXX if the main connection goes stale, does opening another for this statement
# really determine anything?
    $dbh->do('select 1');
  } catch {
    $rc = 0;
  };

  return $rc;
}

sub _set_max_connect {
  my $self = shift;
  my $val  = shift || 256;

  my $dsn = $self->_dbi_connect_info->[0];

  return if ref($dsn) eq 'CODE';

  if ($dsn !~ /maxConnect=/) {
    $self->_dbi_connect_info->[0] = "$dsn;maxConnect=$val";
    my $connected = defined $self->_dbh;
    $self->disconnect;
    $self->ensure_connected if $connected;
  }
}

=head2 using_freetds

Whether or not L<DBD::Sybase> was compiled against FreeTDS. If false, it means
the Sybase OpenClient libraries were used.

=cut

sub using_freetds {
  my $self = shift;

  return $self->_get_dbh->{syb_oc_version} =~ /freetds/i;
}

=head2 set_textsize

When using FreeTDS and/or MSSQL, C<< $dbh->{LongReadLen} >> is not available,
use this function instead. It does:

  $dbh->do("SET TEXTSIZE $bytes");

Takes the number of bytes, or uses the C<LongReadLen> value from your
L<connect_info|DBIx::Class::Storage::DBI/connect_info> if omitted, lastly falls
back to the C<32768> which is the L<DBD::Sybase> default.

=cut

sub set_textsize {
  my $self = shift;
  my $text_size =
    shift
      ||
    try { $self->_dbi_connect_info->[-1]->{LongReadLen} }
      ||
    32768; # the DBD::Sybase default

  return unless defined $text_size;

  $self->_dbh->do("SET TEXTSIZE $text_size");
}

1;

=head1 AUTHORS

See L<DBIx::Class/CONTRIBUTORS>.

=head1 LICENSE

You may distribute this code under the same terms as Perl itself.

=cut
