#!/usr/bin/perl

use Parse::RecDescent;
use POE;
use POE::Component::Client::TCP;
use POE::Component::Server::TCP;
use POE::Filter::Line;
use Socket;

use strict;
use vars qw/ %base %man @try_again /;


%man =
(
    'first'     =>  "Who",
    'second'    =>  "What",
    'third'     =>  "I Don't Know"
);
%base = map { lc } reverse %man;

@try_again =
(
    "So, who's on first?",
    "I want to know who's on first!",
    "What's the name of the first baseman?",
    "Let's start again. What's the name of the guy on first?",
    "Okay, then, who's on second?",
    "Well then, who's on third?",
    "What's the name of the fellow on third?"
);

sub Parse::RecDescent::choose { $_[1 + int rand $#_]; }

my $hostname = gethostbyname( $ARGV[0] || '' );
if ( defined $hostname )
{
    my $costello = Parse::RecDescent->new( q{
        Interpretation:
                Meaning <reject: $item[1] eq $thisparser->{'prev'} >
                { $thisparser->{'prev'} = $item[1] }
            |   { choose( @::try_again ) }

        Meaning:
                Question
            |   UnclearReferent
            |   NonSequitur

        Question:
                Preface Interrogative /[i']s on/ Base
                {
                    choose(
                        "Yes, what is the name of the guy on $item[2]?
+",
                        "The $item[4] baseman?",
                        "I'm asking you! $item[2]",
                        "I don't know"
                    );
                }
            |   Interrogative
                {
                    choose(
                        "That's right, $item[1]?",
                        "What?",
                        "I don't know!"
                    );
                }

        UnclearReferent:
                "He's on" Base
                {
                    choose(
                        "Who's on $item[2]?",
                        "Who is?",
                        "So, what is the name of the guy on $item[2]?"
                    );
                }

        NonSequitur:
                ( "Yes" | "Certainly" | /that's correct/i )
                {
                    choose(
                        "$item[1], who?",
                        "What?",
                        @::try_again
                    );
                }

        Interrogative:
                /who/i | /what/i

        Base:   
                'first' 
            |   'second' 
            |   'third'

        Preface:
                ...!Interrogative /\S*/
    });

    POE::Component::Client::TCP->new(
        'RemoteAddress' =>  inet_ntoa( $hostname ),
        'RemotePort'    =>  12477,
        'Filter'        =>  'POE::Filter::Line',
        'Connected'     =>  sub 
        {
            print STDOUT "<costello>  Who's on first?\n";
            $_[ HEAP ]->{'server'}->put( "Who's on first?" );
        },
        'ServerInput'   =>  sub
        {
            my ( $heap, $line ) = @_[ HEAP, ARG0 ];
            my $reply = $costello->Interpretation( $line );
            print STDOUT "<abbott>    ", $line, "\n";
            sleep 1;
            print STDOUT "<costello>  ", $reply, "\n";
            $heap->{'server'}->put( $reply );
        }
    );
}
else
{
    my $abbott = Parse::RecDescent->new( q{
        Interpretation:
                ConfirmationRequest
            |   NameRequest 
            |   BaseRequest

        ConfirmationRequest:
                Preface(s?) Name /[i']s on/ Base
                {
                    ( lc $::man{ $item[4] } eq lc $item[2] )
                        ?   "Yes"
                        :   "No, $::man{ $item[4] }\'s on $item[4]"
                }
            |   Preface(s?) Name /[i']s the (name of the)?/ Man /('s n
+ame )?on/ Base
                {
                    ( lc $::man{ $item[6] } eq lc $item[2] )
                        ?   "Certainly"
                        :   "No. \u$item[2] is on " . $::base{ lc $ite
+m[2] }
                }

        BaseRequest:
                Preface(s?) Name /(is)?/
                { "He's on " . $::base{ lc $item[2] } }

        NameRequest:
                /(What's the name of)?the/i Base "baseman"
                { $::man{ $item[2] } }

        Preface:
                ...!Name /\S*/

        Name:   
                /who/i 
            |   /what/i 
            |   /i don't know/i

        Base:   
                'first' 
            |   'second' 
            |   'third'

        Man:    
                'man' 
            |   'guy' 
            |   'fellow'
    });

    POE::Component::Server::TCP->new(
        'Alias'         =>  'server',
        'Port'          =>  12477,
        'ClientInput'   =>  sub
        {
            my ( $heap, $line ) = @_[ HEAP, ARG0 ];
            my $reply = $abbott->Interpretation( $line );
            print STDOUT "<costello>  ", $line, "\n";
            sleep 1;
            print STDOUT "<abbott>    ", $reply, "\n";
            $heap->{'client'}->put( $reply );
        }
    );
}

$poe_kernel->run;
exit 0;
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