#!/usr/bin/env python3

# Test whether "topic alias" works to the broker
# MQTT v5

from mosq_test_helper import *

rc = 1
keepalive = 60
connect1_packet = mosq_test.gen_connect("sub-test", keepalive=keepalive, proto_ver=5)
connack1_packet = mosq_test.gen_connack(rc=0, proto_ver=5)

connect2_packet = mosq_test.gen_connect("pub-test", keepalive=keepalive, proto_ver=5)
connack2_packet = mosq_test.gen_connack(rc=0, proto_ver=5)

mid = 1
subscribe_packet = mosq_test.gen_subscribe(mid, "subpub/alias", 0, proto_ver=5)
suback_packet = mosq_test.gen_suback(mid, 0, proto_ver=5)

props = mqtt5_props.gen_uint16_prop(mqtt5_props.PROP_TOPIC_ALIAS, 3)
publish1_packet = mosq_test.gen_publish("subpub/alias", qos=0, payload="message", proto_ver=5, properties=props)

props = mqtt5_props.gen_uint16_prop(mqtt5_props.PROP_TOPIC_ALIAS, 3)
publish2s_packet = mosq_test.gen_publish("", qos=0, payload="message", proto_ver=5, properties=props)
publish2r_packet = mosq_test.gen_publish("subpub/alias", qos=0, payload="message", proto_ver=5)


port = mosq_test.get_port()
broker = mosq_test.start_broker(filename=os.path.basename(__file__), port=port)

try:
    sock1 = mosq_test.do_client_connect(connect1_packet, connack1_packet, timeout=5, port=port)
    sock2 = mosq_test.do_client_connect(connect2_packet, connack2_packet, timeout=5, port=port)

    sock1.send(publish1_packet)

    mosq_test.do_send_receive(sock2, subscribe_packet, suback_packet, "suback")

    sock1.send(publish2s_packet)

    if mosq_test.expect_packet(sock2, "publish2r", publish2r_packet):
        rc = 0

    sock1.close()
    sock2.close()
finally:
    broker.terminate()
    broker.wait()
    (stdo, stde) = broker.communicate()
    if rc:
        print(stde.decode('utf-8'))

exit(rc)