#
# (c) Jan Gehring <jan.gehring@gmail.com>
#
# vim: set ts=2 sw=2 tw=0:
# vim: set expandtab:

package Rex::Shared::Var::Array;

use strict;
use warnings;

our $VERSION = '1.2.0'; # VERSION

use Fcntl qw(:DEFAULT :flock);
use Data::Dumper;

use Storable;

sub __lock;
sub __retr;
sub __store;

sub TIEARRAY {
  my $self = { varname => $_[1], };

  bless $self, $_[0];

}

sub STORE {
  my $self  = shift;
  my $index = shift;
  my $value = shift;

  return __lock sub {
    my $ref = __retr;
    my $ret = $ref->{ $self->{varname} }->{data}->[$index] = $value;
    __store $ref;

    return $ret;
  };

}

sub FETCH {
  my $self  = shift;
  my $index = shift;

  return __lock sub {
    my $ref = __retr;
    my $ret = $ref->{ $self->{varname} }->{data}->[$index];

    return $ret;
  };
}

sub CLEAR {
  my $self = shift;

  __lock sub {
    my $ref = __retr;
    $ref->{ $self->{varname} } = { data => [] };
    __store $ref;
  };

}

sub DELETE {
  my $self  = shift;
  my $index = shift;

  __lock sub {
    my $ref = __retr;
    delete $ref->{ $self->{varname} }->{data}->[$index];
    __store $ref;
  };

}

sub EXISTS {
  my $self  = shift;
  my $index = shift;

  return __lock sub {
    my $ref = __retr;
    return exists $ref->{ $self->{varname} }->{data}->[$index];
  };

}

sub PUSH {
  my $self = shift;
  my @data = @_;

  __lock sub {
    my $ref = __retr;

    if ( !ref( $ref->{ $self->{varname} }->{data} ) eq "ARRAY" ) {
      $ref->{ $self->{varname} }->{data} = [];
    }

    push( @{ $ref->{ $self->{varname} }->{data} }, @data );

    __store $ref;
  };

}

sub EXTEND {
  my $self  = shift;
  my $count = shift;
}

sub STORESIZE {
  my $self    = shift;
  my $newsize = shift;
}

sub FETCHSIZE {
  my $self = shift;

  return __lock sub {
    my $ref = __retr;
    if ( !exists $ref->{ $self->{varname} } ) {
      return 0;
    }
    return scalar( @{ $ref->{ $self->{varname} }->{data} } );
  };

}

sub DESTROY {
  my $self = shift;
}

sub __lock {

  sysopen( my $dblock, "vars.db.lock", O_RDONLY | O_CREAT ) or die($!);
  flock( $dblock, LOCK_SH ) or die($!);

  my $ret = &{ $_[0] }();

  close($dblock);

  return $ret;
}

sub __store {
  my $ref = shift;
  store( $ref, "vars.db" );
}

sub __retr {

  if ( !-f "vars.db" ) {
    return {};
  }

  return retrieve("vars.db");

}

1;