#!/usr/bin/perl

###########################################################################
# creates a UAC and a UAS using Net::SIP::Simple
# and makes call from UAC to UAS,
# transfer RTP data during call, then hang up
###########################################################################

use strict;
use warnings;
use Test::More tests => 9*2;
do './testlib.pl' || do './t/testlib.pl' || die "no testlib";

use Net::SIP ':all';
use IO::Socket;
use File::Temp;

for my $proto (qw(ip4 ip6)) {
    SKIP: {
	if ($proto eq 'ip6' && !do_ipv6()) {
	    skip "no IPv6 support",9;
	    next;
	}

	note("------ testing with $proto");

	# create leg for UAS on dynamic port
	my ($sock_uas,$uas_addr) = create_socket();
	diag( "UAS on $uas_addr" );

	# fork UAS and make call from UAC to UAS
	pipe( my $from_uas,my $to_uac); # for status updates
	defined( my $pid = fork() ) || die $!;

	if ( $pid == 0 ) {
	    # CHILD = UAS
	    close($from_uas);
	    $to_uac->autoflush;
	    uas( $sock_uas, $to_uac );
	    exit(0);
	}

	# PARENT = UAC
	close($sock_uas);
	close($to_uac);

	alarm(40);
	$SIG{__DIE__} = $SIG{ALRM} = sub { kill 9,$pid; ok( 0,'died' ) };

	uac( $uas_addr,$from_uas );
	my $uas = <$from_uas>;
	is( $uas, "UAS finished events=1 2 D # 3 4 B *\n", "UAS finished with DTMF" );
	wait;
    }
}

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

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

    my $packets = 300;
    my $send_something = sub {
	return unless $packets-- > 0;
	my $buf = sprintf "%010d",$packets;
	$buf .= "1234567890" x 15;
	return $buf; # 160 bytes for PCMU/8000
    };

    # create Net::SIP::Simple object
    my $rtp_done;
    my ($lsock,$laddr) = create_socket_to( $peer_addr );
    diag( "UAC on $laddr" );
    my $uac = Simple->new(
	from         => 'me.uac@example.com',
	leg          => $lsock,
	domain2proxy => { 'example.com' => $peer_addr },
    );
    ok( $uac, 'UAC created' );

    # wait until UAS is ready and listening
    my $uas = <$from_uas>;
    is( $uas, "UAS ready\n","UAS ready" );

    # Call UAS
    my @events;
    my $call = $uac->invite(
	'you.uas@example.com',
	init_media  => $uac->rtp( 'send_recv', $send_something ),
	cb_rtp_done => \$rtp_done,
	cb_dtmf => sub {
	    push @events,shift;
	}
    );
    ok( ! $uac->error, 'no error on UAC' );
    ok( $call, 'Call established' );

    $call->dtmf('12D#',methods => 'rfc2833');
    $call->dtmf('34B*',methods => 'audio');

    $call->loop( \$rtp_done, 10 );
    ok( $rtp_done, "Done sending RTP" );

    my $stop;
    $call->bye( cb_final => \$stop );
    $call->loop( \$stop,10 );
    ok( $stop, 'UAS down' );

    $uas = <$from_uas>;
    is( $uas,"UAS RTP ok\n","UAS RTP ok" );
    # DTMF echoed back
    is( "@events","1 2 D # 3 4 B *", "UAC DTMF received");
}

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

sub uas {
    my ($sock,$to_uac) = @_;
    Debug->set_prefix( "DEBUG(uas):" );
    my $uas = Simple->new(
	domain => 'example.com',
	leg => $sock
    ) || die $!;

    # store received RTP data in array
    my @received;
    my $save_rtp = sub {
	my $buf = shift;
	push @received,$buf;
	#warn substr( $buf,0,10)."\n";
    };

    # Listen
    my ($call_closed,@events);
    $uas->listen(
	cb_create      => sub { diag( 'call created' );1 },
	cb_established => sub { diag( 'call established' );1 },
	cb_cleanup     => sub {
	    diag( 'call cleaned up' );
	    $call_closed =1;
	},
	init_media     => $uas->rtp( 'recv_echo', $save_rtp ),
	cb_dtmf => sub {
	    push @events,shift
	}
    );

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

    # Loop until call is closed, at most 10 seconds
    $uas->loop( \$call_closed, 10 );

    diag( "received ".int(@received)."/100 packets events=@events" );

    # at least 20% of all RTP packets should come through
    if ( @received > 20 ) {
	print $to_uac "UAS RTP ok\n"
    } else {
	print $to_uac "UAS RTP received only ".int(@received)."/100 packets\n";
    }

    # done
    if ( $call_closed ) {
	print $to_uac "UAS finished events=@events\n";
    } else {
	print $to_uac "call closed by timeout not stopvar\n";
    }
}