package FS::svc_Tower_Mixin;

use strict;

=item tower_sector

=item tower_sector_sql HASHREF

Class method which returns a list of WHERE clause fragments to 
search for services with tower/sector given by HASHREF.  Can 
contain 'towernum' and 'sectornum' keys, either of which can be 
an arrayref or a single value.  To use this, the search needs to
join to tower_sector.

towernum or sectornum can also contain 'none' to allow null values.

=cut

sub tower_sector_sql {
  my( $class, $params ) = @_;
  return () unless keys %$params;

  my @where = ();
  for my $field (qw(towernum sectornum)) {
    my $value = $params->{$field} or next;
    if ( ref $value and grep { $_ } @$value ) {
      my $in = join(',', map { /^(\d+)$/ ? $1 : () } @$value);
      my @orwhere;
      push @orwhere, "tower_sector.$field IN ($in)" if $in;
      if ( grep /^none$/, @$value ) {
        # then allow this field to be null
        push @orwhere, "tower_sector.$field IS NULL";
        # and if this field is the sector, also allow the default sector
        # on the tower
        push @orwhere, "sectorname = '_default'" if $field eq 'sectornum';
      }
      push @where, '( '.join(' OR ', @orwhere).' )';
    }
    elsif ( $value =~ /^(\d+)$/ ) {
      push @where, "tower_sector.$field = $1";
    }
    elsif ( $value eq 'none' ) {
      push @where, "tower_sector.$field IS NULL";
    }
  }
  @where;
}

1;