package Bot::Backbone::Dispatcher::Predicate;
$Bot::Backbone::Dispatcher::Predicate::VERSION = '0.160630';
use v5.10;
use Moose::Role;

# ABSTRACT: Defines the predicate packages responsible for aiding dispatch


requires qw( do_it more_predicates );

{
    package Bot::Backbone::Dispatcher::Predicate::RedispatchTo;
$Bot::Backbone::Dispatcher::Predicate::RedispatchTo::VERSION = '0.160630';
use v5.10;
    use Moose;

    with 'Bot::Backbone::Dispatcher::Predicate';

    has name => ( is => 'ro', isa => 'Str', required => 1 );

    sub do_it {
        my ($self, $service, $message) = @_;

        my $redispatch_service = $service->get_service($self->name);
        return $redispatch_service->dispatch_message($message);
    }

    sub more_predicates {
        my ($self, $service) = @_;

        my $redispatch_service = $service->get_service($self->name);
        my $dispatcher = $redispatch_service->dispatcher;
        return (
            $dispatcher->list_predicates,
            $dispatcher->list_also_predicates,
        );
    }

    __PACKAGE__->meta->make_immutable;
}

{
    package Bot::Backbone::Dispatcher::Predicate::Nesting;
$Bot::Backbone::Dispatcher::Predicate::Nesting::VERSION = '0.160630';
use v5.10;
    use Moose;

    has next_predicate => ( 
        is           => 'ro', 
        isa          => 'Bot::Backbone::Dispatcher::Predicate',
        required     => 1,
        handles      => [ 'do_it' ],
    );

    with 'Bot::Backbone::Dispatcher::Predicate';

    # This is what handles => [ 'do_it' ] is doing above
    # sub do_it {
    #     my ($self, $service, $message) = @_;
    #     return $self->next_predicate->do_it($service, $message);
    # }

    sub more_predicates {
        my ($self, $service) = @_;
        return ($self->next_predicate);
    }

    __PACKAGE__->meta->make_immutable;
}

{
    package Bot::Backbone::Dispatcher::Predicate::Command;
$Bot::Backbone::Dispatcher::Predicate::Command::VERSION = '0.160630';
use v5.10;
    use Moose;

    extends 'Bot::Backbone::Dispatcher::Predicate::Nesting';

    has match => (
        is          => 'rw',
        isa         => 'Str|RegexpRef',
        required    => 1,
    );

    override do_it => sub {
        my ($self, $service, $message) = @_;

        return $message->set_bookmark_do(sub {
            if ($message->match_next($self->match)) {
                $message->add_flag('command');
                return super();
            }

            return '';
        });
    };

    __PACKAGE__->meta->make_immutable;
}

{
    package Bot::Backbone::Dispatcher::Predicate::NotCommand;
$Bot::Backbone::Dispatcher::Predicate::NotCommand::VERSION = '0.160630';
use v5.10;
    use Moose;

    extends 'Bot::Backbone::Dispatcher::Predicate::Nesting';

    override do_it => sub {
        my ($self, $service, $message) = @_;

        unless ($message->has_flag('command')) {
            return super();
        }

        return '';
    };

    __PACKAGE__->meta->make_immutable;
}

{
    package Bot::Backbone::Dispatcher::Predicate::ToMe;
$Bot::Backbone::Dispatcher::Predicate::ToMe::VERSION = '0.160630';
use v5.10;
    use Moose;

    extends 'Bot::Backbone::Dispatcher::Predicate::Nesting';

    has negate => (
        is          => 'ro',
        isa         => 'Bool',
        required    => 1,
        default     => '',
    );

    override do_it => sub {
        my ($self, $service, $message) = @_;
        
        # XORs break my brain, so just as a reminder...
        #
        # negate | is_to_me | xor result
        #   F    |    F     |    F
        #   F    |    T     |    T
        #   T    |    F     |    T
        #   T    |    T     |    F

        if ($self->negate xor $message->is_to_me) {
            return super();
        }

        return '';
    };

    __PACKAGE__->meta->make_immutable;
}

{
    package Bot::Backbone::Dispatcher::Predicate::Volume;
$Bot::Backbone::Dispatcher::Predicate::Volume::VERSION = '0.160630';
use v5.10;
    use Moose;

    extends 'Bot::Backbone::Dispatcher::Predicate::Nesting';

    use Bot::Backbone::Types qw( VolumeLevel );

    has volume => (
        is          => 'ro',
        isa         => VolumeLevel,
        required    => 1,
        default     => 'spoken',
    );

    override do_it => sub {
        my ($self, $service, $message) = @_;

        if ($self->volume eq $message->volume) {
            return super();
        }

        return '';
    };

    __PACKAGE__->meta->make_immutable;
}

{
    package Bot::Backbone::Dispatcher::Predicate::GivenParameters;
$Bot::Backbone::Dispatcher::Predicate::GivenParameters::VERSION = '0.160630';
use v5.10;
    use Moose;

    extends 'Bot::Backbone::Dispatcher::Predicate::Nesting';

    has parameters => (
        is          => 'ro',
        isa         => 'ArrayRef',
        required    => 1,
        traits      => [ 'Array' ],
        handles     => {
            all_parameters => 'elements',
        },
    );

    override do_it => sub {
        my ($self, $service, $message) = @_;

        return $message->set_bookmark_do(sub {
            for my $arg ($self->all_parameters) {
                my ($name, $config) = @$arg;

                # Match against ->args
                if (defined $config->{match}) {
                    my $match = $config->{match};

                    if (exists $config->{default} 
                            and not $message->has_more_args) {
                        $message->set_parameter($name => $config->{default});
                    }
                    else {
                        my $value = $message->match_next($match);
                        if (defined $value) {
                            $message->set_parameter($name => $value);
                        }
                        else {
                            return '';
                        }
                    }
                }

                # Match against ->text
                elsif (defined $config->{match_original}) {
                    my $match = $config->{match_original};

                    my $value = $message->match_next_original($match);
                    if (defined $value) {
                        $message->set_parameter($name => $value);
                    }
                    elsif (exists $config->{default}) {
                        $message->set_parameter($name => $config->{default});
                    }
                    else {
                        return '';
                    }
                }

                # What the...?
                else {
                    Carp::carp("parameter $name missing 'match' or 'match_original'");
                    return '';
                }
            }

            return super();
        });
    };

    __PACKAGE__->meta->make_immutable;
}

{
    package Bot::Backbone::Dispatcher::Predicate::Functor;
$Bot::Backbone::Dispatcher::Predicate::Functor::VERSION = '0.160630';
use v5.10;
    use Moose::Role;

    use Bot::Backbone::Types qw( DispatcherType );

    has dispatcher_type => (
        is          => 'ro',
        isa         => DispatcherType,
        required    => 1,
        coerce      => 1,
    );

    sub select_invocant {
        my ($self, $service) = @_;
        return $self->dispatcher_type eq 'bot' ? $service->bot : $service;
    }

    has the_code => (
        is          => 'ro',
        isa         => 'CodeRef',
        required    => 1,
        traits      => [ 'Code' ],
        handles     => {
            'call_the_code' => 'execute',
        },
    );
}

{
    package Bot::Backbone::Dispatcher::Predicate::Respond;
$Bot::Backbone::Dispatcher::Predicate::Respond::VERSION = '0.160630';
use v5.10;
    use Moose;

    with qw(
        Bot::Backbone::Dispatcher::Predicate
        Bot::Backbone::Dispatcher::Predicate::Functor
    );

    sub do_it {
        my ($self, $service, $message) = @_;

        my $invocant = $self->select_invocant($service);
        my @responses = $self->call_the_code($invocant, $message);
        if (@responses) {
            for my $response (@responses) {
                $message->reply($invocant, $response);
            }

            return 1;
        }

        return '';
    }

    sub more_predicates { () }

    __PACKAGE__->meta->make_immutable;
}

{
    package Bot::Backbone::Dispatcher::Predicate::Run;
$Bot::Backbone::Dispatcher::Predicate::Run::VERSION = '0.160630';
use v5.10;
    use Moose;

    with qw(
        Bot::Backbone::Dispatcher::Predicate
        Bot::Backbone::Dispatcher::Predicate::Functor
    );

    sub do_it {
        my ($self, $service, $message) = @_;
        my $invocant = $self->select_invocant($service);
        return $self->call_the_code($invocant, $message);
    }

    sub more_predicates { () }

    __PACKAGE__->meta->make_immutable;
}

1;

__END__

=pod

=encoding UTF-8

=head1 NAME

Bot::Backbone::Dispatcher::Predicate - Defines the predicate packages responsible for aiding dispatch

=head1 VERSION

version 0.160630

=head1 DESCRIPTION

Not much to see here unless you want to define custom predicates. If that is your goal, you must read the code. You probably also want to read the code in L<Bot::Backbone::DispatchSugar> while you're at it.

=head1 AUTHOR

Andrew Sterling Hanenkamp <hanenkamp@cpan.org>

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2016 by Qubling Software LLC.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

=cut