package DBIx::Custom::Query;

use strict;

use warnings;

use base 'Object::Simple';

use Carp 'croak';

__PACKAGE__->attr([qw/columns sql sth filters tables/]);

sub filter {

    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') 

            {

              croak qq{Filter "$fname" is not registered"}

                  . qq{ (DBIx::Custom::Query::filter) }

                unless exists $self->filters->{$fname};

              $filter->{$column} = $self->filters->{$fname};

            }

        }

        $self->{filter} = {%{$self->filter}, %$filter};

        return $self;

    }

    return $self->{filter} ||= {};

}

# DEPRECATED!

__PACKAGE__->attr('default_filter');

1;

=head1 NAME

DBIx::Custom::Query - Query

=head1 SYNOPSIS

    my $query = DBIx::Custom::Query->new;

=head1 ATTRIBUTES

=head2 C<columns>

    my $columns = $query->columns;

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

Column names.

=head2 C<filter>

    my $filter = $query->filter;

    $query     = $query->filter(author => 'to_something',

                                 title  => 'to_something');

    $query     = $query->filter([qw/author title/] => 'to_something');

Filters when parameter binding is executed.

=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