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#  Copyright 2014 - present MongoDB, Inc.
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#  http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.

use strict;
use warnings;
package MongoDB::QueryResult;

# ABSTRACT: An iterator for Mongo query results

use version;
our $VERSION = 'v2.0.2';

use Moo;
use MongoDB::Error;
use MongoDB::_Constants;
use MongoDB::Op::_GetMore;
use MongoDB::Op::_KillCursors;
use MongoDB::_Types qw(
    BSONCodec
    ClientSession
    HostAddress
    Intish
    Numish
    Stringish
);
use Types::Standard qw(
    Maybe
    ArrayRef
    Any
    InstanceOf
    HashRef
    Overload
);
use namespace::clean;

with $_ for qw(
  MongoDB::Role::_PrivateConstructor
  MongoDB::Role::_CursorAPI
);

# attributes needed for get more

has _client => (
    is       => 'rw',
    required => 1,
    isa => InstanceOf['MongoDB::MongoClient'],
);

has _address => (
    is       => 'ro',
    required => 1,
    isa => HostAddress,
);

has _full_name => (
    is       => 'ro',
    required => 1,
    isa => Stringish
);

has _bson_codec => (
    is       => 'ro',
    required => 1,
    isa => BSONCodec,
);

has _batch_size => (
    is       => 'ro',
    required => 1,
    isa      => Intish,
);

has _max_time_ms => (
    is       => 'ro',
    isa      => Numish,
);

has _session => (
    is => 'rwp',
    isa => Maybe[ClientSession],
);

# attributes for tracking progress

has _cursor_at => (
    is       => 'ro',
    required => 1,
    isa      => Numish,
);

sub _inc_cursor_at { $_[0]{_cursor_at}++ }

has _limit => (
    is       => 'ro',
    required => 1,
    isa      => Numish,
);

# attributes from actual results

# integer or MongoDB::_CursorID or Math::BigInt
has _cursor_id => (
    is       => 'ro',
    required => 1,
    writer   => '_set_cursor_id',
    isa => Any,
);

has _cursor_start => (
    is       => 'ro',
    required => 1,
    writer   => '_set_cursor_start',
    isa      => Numish,
);

has _cursor_flags => (
    is       => 'ro',
    required => 1,
    writer   => '_set_cursor_flags',
    isa      => HashRef,
);

has _cursor_num => (
    is       => 'ro',
    required => 1,
    isa      => Numish,
);

sub _inc_cursor_num { $_[0]{_cursor_num} += $_[1] }

has _docs => (
    is       => 'ro',
    required => 1,
    isa      => ArrayRef,
);

sub _drained { ! @{$_[0]{_docs}} }
sub _doc_count { scalar @{$_[0]{_docs}} }
sub _add_docs {
    my $self = shift;
    push @{$self->{_docs}}, @_;
}
sub _next_doc { shift @{$_[0]{_docs}} }
sub _drain_docs {
    my @docs = @{$_[0]{_docs}};
    $_[0]{_cursor_at} += scalar @docs;
    @{$_[0]{_docs}} = ();
    return @docs;
}

# for backwards compatibility
sub started_iterating() { 1 }

sub _info {
    my ($self) = @_;
    return {
        flag      => $self->_cursor_flags,
        cursor_id => $self->_cursor_id,
        start     => $self->_cursor_start,
        at        => $self->_cursor_at,
        num       => $self->_cursor_num,
    };
}

#pod =method has_next
#pod
#pod     if ( $response->has_next ) {
#pod         ...
#pod     }
#pod
#pod Returns true if additional documents are available.  This will
#pod attempt to get another batch of documents from the server if
#pod necessary.
#pod
#pod =cut

sub has_next {
    my ($self) = @_;
    my $limit = $self->_limit;
    if ( $limit > 0 && ( $self->_cursor_at + 1 ) > $limit ) {
        $self->_kill_cursor;
        return 0;
    }
    return !$self->_drained || $self->_get_more;
}

#pod =method next
#pod
#pod     while ( $doc = $result->next ) {
#pod         process_doc($doc)
#pod     }
#pod
#pod Returns the next document or C<undef> if the server cursor is exhausted.
#pod
#pod =cut

sub next {
    my ($self) = @_;
    return unless $self->has_next;
    $self->_inc_cursor_at();
    return $self->_next_doc;
}

#pod =method batch
#pod
#pod   while ( @batch = $result->batch ) {
#pod     for $doc ( @batch ) {
#pod       process_doc($doc);
#pod     }
#pod   }
#pod
#pod Returns the next batch of documents or an empty list if the server cursor is exhausted.
#pod
#pod =cut

sub batch {
  my ($self) = @_;
  return unless $self->has_next;
  return $self->_drain_docs;
}

sub _get_more {
    my ($self) = @_;
    return 0 if $self->_cursor_id == 0;

    my $limit = $self->_limit;
    my $want = $limit > 0 ? ( $limit - $self->_cursor_at ) : $self->_batch_size;

    my ($db_name, $coll_name) = split(/\./, $self->_full_name, 2);

    my $op = MongoDB::Op::_GetMore->_new(
        full_name  => $self->_full_name,
        db_name    => $db_name,
        coll_name  => $coll_name,
        client     => $self->_client,
        bson_codec => $self->_bson_codec,
        cursor_id  => $self->_cursor_id,
        batch_size => $want,
        ( $self->_max_time_ms ? ( max_time_ms => $self->_max_time_ms ) : () ),
        session             => $self->_session,
        monitoring_callback => $self->_client->monitoring_callback,
    );

    my $result = $self->_client->send_direct_op( $op, $self->_address );

    $self->_set_cursor_id( $result->{cursor_id} );
    $self->_set_cursor_flags( $result->{flags} );
    $self->_set_cursor_start( $result->{starting_from} );
    $self->_inc_cursor_num( $result->{number_returned} );
    $self->_add_docs( @{ $result->{docs} } );
    return scalar @{ $result->{docs} };
}

#pod =method all
#pod
#pod     @docs = $result->all;
#pod
#pod Returns all documents as a list.
#pod
#pod =cut

sub all {
    my ($self) = @_;
    my @ret;
    push @ret, $self->_drain_docs while $self->has_next;
    return @ret;
}

sub _kill_cursor {
    my ($self) = @_;
    my $cursor_id = $self->_cursor_id;
    return if !defined $cursor_id || $cursor_id == 0;

    my ($db_name, $coll_name) = split(/\./, $self->_full_name, 2);
    my $op = MongoDB::Op::_KillCursors->_new(
        db_name             => $db_name,
        coll_name           => $coll_name,
        full_name           => $self->_full_name,
        bson_codec          => $self->_bson_codec,
        cursor_ids          => [$cursor_id],
        client              => $self->_client,
        session             => $self->_session,
        monitoring_callback => $self->_client->monitoring_callback,
    );
    $self->_client->send_direct_op( $op, $self->_address );
    $self->_set_cursor_id(0);
}

sub DEMOLISH {
    my ($self) = @_;
    $self->_kill_cursor;
}

#pod =head1 SYNOPSIS
#pod
#pod     $cursor = $coll->find( $filter );
#pod     $result = $cursor->result;
#pod
#pod     while ( $doc = $result->next ) {
#pod         process_doc($doc)
#pod     }
#pod
#pod =head1 DESCRIPTION
#pod
#pod This class defines an iterator against a query result.  It automatically
#pod fetches additional results from the originating mongod/mongos server
#pod on demand.
#pod
#pod For backwards compatibility reasons, L<MongoDB::Cursor> encapsulates query
#pod parameters and generates a C<MongoDB::QueryResult> object on demand.  All
#pod iterators on C<MongoDB::Cursor> delegate to C<MongoDB::QueryResult> object.
#pod
#pod Retrieving this object and iterating on it directly will be slightly
#pod more efficient.
#pod
#pod =head1 USAGE
#pod
#pod =head2 Error handling
#pod
#pod Unless otherwise explicitly documented, all methods throw exceptions if
#pod an error occurs.  The error types are documented in L<MongoDB::Error>.
#pod
#pod To catch and handle errors, the L<Try::Tiny> and L<Safe::Isa> modules
#pod are recommended:
#pod
#pod =head2 Cursor destruction
#pod
#pod When a C<MongoDB::QueryResult> object is destroyed, a cursor termination
#pod request will be sent to the originating server to free server resources.
#pod
#pod =head2 Multithreading
#pod
#pod Iterators are cloned in threads, but not reset.  Iterating from multiple
#pod threads will give unpredictable results.  Only iterate from a single
#pod thread.
#pod
#pod =cut

1;

__END__

=pod

=encoding UTF-8

=head1 NAME

MongoDB::QueryResult - An iterator for Mongo query results

=head1 VERSION

version v2.0.2

=head1 SYNOPSIS

    $cursor = $coll->find( $filter );
    $result = $cursor->result;

    while ( $doc = $result->next ) {
        process_doc($doc)
    }

=head1 DESCRIPTION

This class defines an iterator against a query result.  It automatically
fetches additional results from the originating mongod/mongos server
on demand.

For backwards compatibility reasons, L<MongoDB::Cursor> encapsulates query
parameters and generates a C<MongoDB::QueryResult> object on demand.  All
iterators on C<MongoDB::Cursor> delegate to C<MongoDB::QueryResult> object.

Retrieving this object and iterating on it directly will be slightly
more efficient.

=head1 USAGE

=head2 Error handling

Unless otherwise explicitly documented, all methods throw exceptions if
an error occurs.  The error types are documented in L<MongoDB::Error>.

To catch and handle errors, the L<Try::Tiny> and L<Safe::Isa> modules
are recommended:

=head2 Cursor destruction

When a C<MongoDB::QueryResult> object is destroyed, a cursor termination
request will be sent to the originating server to free server resources.

=head2 Multithreading

Iterators are cloned in threads, but not reset.  Iterating from multiple
threads will give unpredictable results.  Only iterate from a single
thread.

=head1 METHODS

=head2 has_next

    if ( $response->has_next ) {
        ...
    }

Returns true if additional documents are available.  This will
attempt to get another batch of documents from the server if
necessary.

=head2 next

    while ( $doc = $result->next ) {
        process_doc($doc)
    }

Returns the next document or C<undef> if the server cursor is exhausted.

=head2 batch

  while ( @batch = $result->batch ) {
    for $doc ( @batch ) {
      process_doc($doc);
    }
  }

Returns the next batch of documents or an empty list if the server cursor is exhausted.

=head2 all

    @docs = $result->all;

Returns all documents as a list.

=head1 AUTHORS

=over 4

=item *

David Golden <david@mongodb.com>

=item *

Rassi <rassi@mongodb.com>

=item *

Mike Friedman <friedo@friedo.com>

=item *

Kristina Chodorow <k.chodorow@gmail.com>

=item *

Florian Ragwitz <rafl@debian.org>

=back

=head1 COPYRIGHT AND LICENSE

This software is Copyright (c) 2018 by MongoDB, Inc.

This is free software, licensed under:

  The Apache License, Version 2.0, January 2004

=cut

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