package Catmandu::Importer::Solr;

use Catmandu::Sane;
use Catmandu::Store::Solr;
use Catmandu;
use Moo;

our $VERSION = '0.0303';

with 'Catmandu::Importer';

has fq        => (is => 'ro');
has query     => (is => 'ro');
has url       => (is => 'ro');
has bag       => (is => 'ro');
has id_field  => (is => 'ro', default => sub {'_id'});
has bag_field => (is => 'ro', default => sub {'_bag'});
has _bag      => (is => 'ro', lazy => 1, builder => '_build_bag',);
has fl        => (is => 'ro', lazy => 1, default => sub {"*"});

sub _build_bag {
    my $self = $_[0];
    Catmandu::Store::Solr->new(
        url       => $self->url,
        bag_field => $self->bag_field,
        id_field  => $self->id_field
    )->bag($self->bag());
}

sub generator {
    my ($self) = @_;

    return sub {
        state $start = 0;
        state $limit = 100;
        state $total = 100;
        state $hits  = [];

        unless (scalar(@$hits)) {

            return if $start >= $total;

            my $res = $self->_bag()->search(
                query      => $self->query,
                fq         => $self->fq,
                start      => $start,
                limit      => $limit,
                fl         => $self->fl,
                facet      => "false",
                spellcheck => "false",
                sort       => $self->id_field() . " asc"
            );
            $total = $res->total;
            $hits  = $res->hits();

            $start += $limit;

        }

        shift(@$hits);

        }
}

sub count {
    my ($self) = @_;
    $self->_bag()->search(
        query      => $self->query,
        fq         => $self->fq,
        limit      => 0,
        facet      => "false",
        spellcheck => "false"
    )->total();
}

=head1 NAME

Catmandu::Importer::Solr - Catmandu module to import data from a Solr endpoint

=head1 SYNOPSIS

    # From the command line
    $ catmandu convert Solr --url "http://localhost:8983/solr" --query "type:book"

    # From perl
    use Catmandu;

    my %attrs = (
        url => "http://localhost:8983/solr",
        query => 'type:book',
        bag_field => '_bag',
        id_field => '_id'
    );

    my $importer = Catmandu->importer('Solr',%attrs);

    $importer->each(sub {
	    my $row_hash = shift;
	    ...
    });

=head1 AUTHOR

Nicolas Franck, C<< nicolas.franck at ugent.be >>

=head1 SEE ALSO

L<Catmandu>, L<Catmandu::Importer> , L<Catmandu::Store::Solr>

=cut

1;