import unittest
import settings
import time
import mosquitto


def on_message(mosq, obj, msg):
    obj.message_queue.append(msg)


class mqtt_basic(unittest.TestCase):

    message_queue = []

    @classmethod
    def setUpClass(self):
        self.client = mosquitto.Mosquitto("pubsubclient_ut", clean_session=True, obj=self)
        self.client.connect(settings.server_ip)
        self.client.on_message = on_message
        self.client.subscribe("outTopic", 0)

    @classmethod
    def tearDownClass(self):
        self.client.disconnect()

    def test_one(self):
        i = 30
        while len(self.message_queue) == 0 and i > 0:
            self.client.loop()
            time.sleep(0.5)
            i -= 1
        self.assertTrue(i > 0, "message receive timed-out")
        self.assertEqual(len(self.message_queue), 1, "unexpected number of messages received")
        msg = self.message_queue[0]
        self.assertEqual(msg.mid, 0, "message id not 0")
        self.assertEqual(msg.topic, "outTopic", "message topic incorrect")
        self.assertEqual(msg.payload, "hello world")
        self.assertEqual(msg.qos, 0, "message qos not 0")
        self.assertEqual(msg.retain, False, "message retain flag incorrect")