#!/usr/local/bin/perl

use Getopt::Long ;
use strict ;

use Stem ;

my %args ;
my $hub_name ;
my $portal ;

parse_args() ;

setup_hub() ;

send_msg() ;

Stem::Event::start_loop() ;

# no return from here.
######################

sub setup_hub {

	$hub_name = "Stem_msg_$$" ;

	Stem::Route::register_class( __PACKAGE__ ) ;

	Stem::Hub->new( 'reg_name' => $hub_name ) ;

	my @portal_args ;

	push @portal_args, ( 'host' => $args{'host'} ) if $args{'host'} ;
	push @portal_args, ( 'port' => $args{'port'} ) if $args{'port'} ;

#print "portal args: @portal_args\n" ;

	$portal = Stem::Portal->new( @portal_args ) ;

	die "Can't create Portal: $portal" if $portal ;
}

sub send_msg {

	my ( @msg_args, @target ) ;

	if ( $args{'cmd'} ) {

		@msg_args = ( 'type' => 'cmd', 'cmd' => $args{'cmd'} ) ;
	}
	else {

		@msg_args = ( 'type' => 'data' ) ;
	}

	@target = ( 'to_target' => $args{'target'} ) if $args{'target'} ;

	push( @msg_args, ( 'ack_req' => 1 ) ) if $args{'ack'} ;

	my $data = exists( $args{'data'} ) ? $args{'data'} : '' ;

	my $msg = Stem::Msg->new( 
			'to_hub'	=> 'DEFAULT',
			'to_cell'	=> $args{'cell'},
			@target,
			'from_cell'	=> __PACKAGE__,
			'from_hub'	=> $hub_name,
			'data'		=> \$data,
			@msg_args,
		) ;

	$msg->dispatch() ;
}

# this is the class method that gets back the response and ack messages.

sub msg_in {

	my( $class, $msg ) = @_ ;

	if( $msg->type() eq 'msg_ack' ) {

#		print "ACK\n" ;
		exit ;
	}

	if ( my $data = $msg->data() ) {

		print ${$data} ;
	}

#	$portal->shut_down() ;

	exit unless $args{'ack'} ;

	return ;
}


sub parse_args {

	Getopt::Long::Configure( 'no_ignore_case' ) ;

	GetOptions( \%args,
		    'cell|C=s',
		    'hub|H=s',
		    'target|T=s',
		    'cmd|c=s',
		    'data|d=s',
		    'ack|a',
		    'host|h=s',
		    'port|p=s',
		    'help|?',
	) ;

#print map "$_ => $args{$_}\n", sort keys %args ;

	usage( '' ) if $args{ 'help' } ;

	usage( 'Missing Cell address' ) unless $args{ 'cell' } ;
}

sub usage {

	my $err_msg = shift ;

	my $usage = <<'=cut' ;
=pod

=head1 NAME

stem_msg - Inject a message into a Stem Hub

=head1 SYNOPSIS

stem_msg -cell <cell> [-hub <hub>] [-target <target>]
        [-cmd <cmd>] [-data <data>] [-ack]
        [-host <host>] [-port <port>]

	-C <cell>		The Stem Cell to send this message to.
	-cell <cell>		This is required.

	-H <hub>		The hub which has the addressed Stem Cell.
	-hub <hub>		

	-T <target>		The target address of the Stem Cell
	-target <target>

	-c <cmd>		The cmd type to send in the message
	-cmd <cmd>		If no cmd is set, it will be a data type
				message. 

	-d <data>		The data to be sent in the message.
	-data <data>		Default is an empty string.

	-a			Wait for an acknowledge message before
	-ack 			exiting.

	-h <host>		The host which the Stem Hub is on.
	-host <host>		Default: localhost

	-p <port>		The port which the Stem Portal is listening
	-port <port>		to.
				Default: 10,000 (probably will change)

=head1 DESCRIPTION

This program is meant to inject a single message into a Stem Hub. You
set the Cell address with the command line options and then which
command to execute in that Cell. If you don't set a command, then a
data message will be sent. You can send data in the message as well.

If the Cell generates a response message, then its data will be
printed on stdout.

If the -ack option is set, then the message will have the ack_req flag
will be set in the outgoing message. This will cause an 'ack' type
message to be sent back after the original message has been
delivered. This is meant for when you send a message to a Cell which
doesn't generate a response. It lets this program know that it can
exit.

=cut

	$usage =~ s/^=\w+.*$//mg ;

	$usage =~ s/\n{2,}/\n\n/ ;
	$usage =~ s/\A\n+/\n/ ;

	die "$err_msg\n$usage" ;
}