#!/usr/bin/perl

###########################################################################
# creates a UAC and a UAS using Net::SIP::Simple
# and makes call from UAC to UAS,
# Call does not involve transfer of RTP data
# UAS will on ring, but never 200 Ok, UAC will cancel call
###########################################################################

use strict;
use warnings;
use Test::More tests => 8;

use Net::SIP;
use Net::SIP::Util ':all';
use IO::Socket;

# create leg for UAS on dynamic port
my $sock_uas = IO::Socket::INET->new(
    Proto => 'udp',
    LocalAddr => '127.0.0.1',
    LocalPort => 0, # let system pick one
);
ok( $sock_uas, 'create UAS socket' );

# get address for UAS
my $uas_addr = do {
    my ($port,$host) = unpack_sockaddr_in ( getsockname($sock_uas));
    inet_ntoa( $host ).":$port"
};


# fork UAS and make call from UAC to UAS
pipe( my $read,my $write); # to sync UAC with UAS
my $pid = fork();
if ( defined($pid) && $pid == 0 ) {
    close($read);
    $write->autoflush;
    uas( $sock_uas, $write );
    exit(0);
}

ok( $pid, "fork successful" );
close( $sock_uas );
close($write);

alarm(15);
$SIG{__DIE__} = $SIG{ALRM} = sub { kill 9,$pid; ok( 0,'died' ) };

uac( $uas_addr,$read );
ok( <$read>, "done" );
wait;

###############################################
# UAC
###############################################

sub uac {
    my ($peer_addr,$pipe) = @_;
    Net::SIP::Debug->set_prefix( "DEBUG(uac):" );

    ok( <$pipe>, "UAS created\n" ); # wait until UAS is ready
    my $uac = Net::SIP::Simple->new(
	from => 'me.uac@example.com',
	leg => scalar(create_socket_to( $peer_addr )),
	domain2proxy => { 'example.com' => $peer_addr },
    );
    ok( $uac, 'UAC created' );

    ok( <$pipe>, "UAS ready\n" ); # wait until UAS is ready
    my $call_ok = 0;
    my $end_code;
    my $call = $uac->invite(
	'you.uas@example.com',
	cb_final => sub {
	    my ($status,$self,%info) = @_;
	    $end_code = $info{code};
	},
    );
    $uac->loop(3,\$call_ok);
    ok($call_ok == 0,'invite did not complete');
    $call->cancel;
    $uac->loop(3,\$end_code);
    ok( $end_code==487,'got 487 (request canceled)');
}

###############################################
# UAS
###############################################

sub uas {
    my ($sock,$pipe) = @_;
    Net::SIP::Debug->set_prefix( "DEBUG(uas):" );
    my $uas = Net::SIP::Simple->new(
	domain => 'example.com',
	leg => $sock
    ) || die $!;
    print $pipe "UAS created\n";

    my $timer;
    my $got_cancel;
    my $my_receive = sub {
	my ($self,$endpoint,$ctx,$error,$code,$packet,$leg,$from) = @_;
	if ( $packet->is_request && $packet->method eq 'INVITE' ) {
	    # just ring
	    my $ring = $packet->create_response( 180,'Ringing' );
	    $timer ||= $endpoint->{dispatcher}->add_timer( 1,
		sub { $endpoint->new_response( $ctx,$ring,$leg,$from ) },
		1 );
	    return;
	}
	if ( $timer && $packet->is_request && $packet->method eq 'CANCEL' ) {
	    $timer->cancel;
	    $got_cancel =1;
	}
	goto &Net::SIP::Simple::Call::receive;
    };

    # Listen
    $uas->listen( cb_create => sub { return $my_receive } );

    # notify UAC process that I'm listening
    print $pipe "UAS ready\n";

    # Loop at most 10 seconds
    $uas->loop( 10,\$got_cancel );
    $uas->loop( 3 );
    print $pipe "UAS done\n";
}