import json
from mqtt import mqtt_client
import time

TEST_CLIENT_ID = "__test_device_tester__"


mqtt_test_client = mqtt_client(TEST_CLIENT_ID, "localhost")


def init_state(all_state_keys, device):
    for state_topic in all_state_keys:
        assert device.get(state_topic, 0) == None


def state_change_by_mqtt(all_state_keys, num_states, mqtt_test_client, base_topic, device, mqtt_data, state_data, warning_condition, mqtt_signal_time):
    tm_warning = None

    for i in range(num_states):
        for state_topic in all_state_keys:
            if device.TX_TYPE == device.TX_VALUE:
                data = json.dumps(mqtt_data(state_topic)[i])
                mqtt_test_client.send(base_topic + '/' + state_topic, data)
            elif device.TX_TYPE == device.TX_DICT:
                mqtt_test_client.send(base_topic, json.dumps({state_topic: mqtt_data(state_topic)[i]}))
            else:
                raise TypeError("Unknown TX_TYPE for device.")
            if callable(warning_condition):
                if warning_condition(state_topic, mqtt_data(state_topic)[i]):
                    tm_warning = int(time.time())
        time.sleep(mqtt_signal_time)
        for state_topic in all_state_keys:
            assert device.get(state_topic) == state_data(state_topic)[i]

    return tm_warning