package DBIx::Custom::Query;
use Object::Simple -base;

use Carp 'croak';
use DBIx::Custom::Util '_subname';

has 'sth',
    sql => '',
    columns => sub { [] };

# DEPRECATED!
has 'default_filter';
sub filters {
    warn "DBIx::Custom::Query filters attribute method is DEPRECATED!";
    my $self = shift;
    if (@_) {
        $self->{filters} = $_[0];
        return $self;
    }
    return $self->{filters};
}
has  tables => sub { [] };

#DEPRECATED!
sub filter {
    warn "DBIx::Custom::Query filter method is DEPRECATED!";
    my $self = shift;
    if (@_) {
        my $filter = {};
        if (ref $_[0] eq 'HASH') {
            $filter = $_[0];
        }
        else {
            my $ef = @_ > 1 ? [@_] : $_[0];
            for (my $i = 0; $i < @$ef; $i += 2) {
                my $column = $ef->[$i];
                my $f = $ef->[$i + 1];
                if (ref $column eq 'ARRAY') {
                    foreach my $c (@$column) {
                        $filter->{$c} = $f;
                    }
                }
                else {
                    $filter->{$column} = $f;
                }
            }
        }
        foreach my $column (keys %$filter) {
            my $fname = $filter->{$column};
            if  (exists $filter->{$column}
              && defined $fname
              && ref $fname ne 'CODE') 
            {
                my $filters = $self->{filters} || {};
                croak qq{Filter "$fname" is not registered" } . _subname
                  unless exists $filters->{$fname};
                $filter->{$column} = $filters->{$fname};
            }
        }
        $self->{filter} = {%{$self->filter}, %$filter};
        return $self;
    }
    return $self->{filter} ||= {};
}

1;

=head1 NAME

DBIx::Custom::Query - Query

=head1 SYNOPSIS
    
    my $query = DBIx::Custom::Query->new;
    my $sth = $query->sth;
    my $sql = $query->sql;
    my $columns = $query->columns;
    
=head1 ATTRIBUTES

=head2 C<columns>

    my $columns = $query->columns;
    $query      = $query->columns(['auhtor', 'title']);

Column names.

=head2 C<sql>

    my $sql = $query->sql;
    $query  = $query->sql('select * from books where author = ?;');

SQL statement.

=head2 C<sth>

    my $sth = $query->sth;
    $query  = $query->sth($sth);

Statement handle of L<DBI>

=head1 METHODS

L<DBIx::Custom::Query> inherits all methods from L<Object::Simple>.

=cut