import json
import os
import ssl
import sys
import threading
import time
import unittest
from datetime import datetime
from unittest.case import TestCase

import paho.mqtt.client as mqtt

from torch_sub import torch_sub

broker_hostname = "mqtt.example.com"
broker_port = 8883

agent_config_path = "test/agent-config/"
mqtt_ca_file = agent_config_path + "ca.crt"
mqtt_cert_file = agent_config_path + "vagrant.crt"
mqtt_key_file = agent_config_path + "vagrant.key"

subscriber_config_path = "test/subscriber-config/"
subscriber_ca_file = subscriber_config_path + "ca.crt"
subscriber_cert_file = subscriber_config_path + "subscriber.crt"
subscriber_key_file = subscriber_config_path + "subscriber.key"


def agent_connect(use_tls=True):
    client = mqtt.Client()
    if use_tls:
        client.tls_set(
            ca_certs=mqtt_ca_file,
            certfile=mqtt_cert_file,
            keyfile=mqtt_key_file,
            cert_reqs=ssl.CERT_REQUIRED)
    client.connect(broker_hostname, broker_port, 60)
    return client


def publish(client_id, onion_hostname, use_tls=True):
    payload = {
        'clientId': client_id,
        'timestamp': datetime.now().strftime("%d-%b-%Y (%H:%M:%S.%f)"),
        'onionAddress': onion_hostname,
        'sshPort': 22
    }

    time.sleep(1)
    client = agent_connect(use_tls=use_tls)
    client.publish("torch/" + client_id + "/wake", json.dumps(payload))
    client.disconnect()
    time.sleep(1)


class GivenBroker(TestCase):
    def setUp(self) -> None:
        if os.path.exists(torch_sub.database_filename):
            os.remove(torch_sub.database_filename)

    def tearDown(self) -> None:
        os.system("docker container stop mosquitto")
        if os.path.exists(torch_sub.database_filename):
            os.remove(torch_sub.database_filename)

    @staticmethod
    def run_broker(tls):
        cli = "test/run-broker.sh " + tls
        if sys.platform.startswith('win32'):
            cli = "test\\run-broker.bat " + tls
        os.system(cli)
        time.sleep(2)

    @staticmethod
    def run_subscriber():
        threading.Thread(target=torch_sub.subscribe,
                         args=(broker_hostname,
                               broker_port,
                               "torch/+/wake",
                               {
                                   'ca_certs': subscriber_ca_file,
                                   'certfile': subscriber_cert_file,
                                   'keyfile': subscriber_key_file
                               }),
                         daemon=True).start()

    @staticmethod
    def run_insecure_subscriber():
        threading.Thread(target=torch_sub.subscribe,
                         args=(broker_hostname,
                               broker_port,
                               "torch/+/wake",
                               None),
                         daemon=True).start()

    @staticmethod
    def loadDatabase():
        with open(torch_sub.database_filename, "r") as database_file:
            return json.load(database_file)


class GivenTlsBroker(GivenBroker):
    def setUp(self) -> None:
        self.run_broker("secure")
        self.run_subscriber()

    def test_when_agent_publishes_should_get_hostname_from_subscriber(self):
        publish("client1", "crazy_onion.onion")

        database = self.loadDatabase()
        self.assertEqual(database['client1']['onionAddress'], "crazy_onion.onion")

    def test_when_agent_publishes_should_get_hostname_from_subscriber2(self):
        publish("client2", "crazy_onion2.onion")

        database = self.loadDatabase()
        self.assertEqual(database['client2']['onionAddress'], "crazy_onion2.onion")

    def test_when_agent_publishes_multiple_hosts_should_provide_latest(self):
        publish("client2", "crazy_onion2-34.onion")
        publish("client3", "crazy_onion3.onion")
        publish("client1", "crazy_onion1.onion")
        publish("client2", "crazy_onion2-56.onion")
        publish("client3", "crazy_onion3.onion")

        database = self.loadDatabase()
        self.assertEqual(database['client1']['onionAddress'], "crazy_onion1.onion")
        self.assertEqual(database['client2']['onionAddress'], "crazy_onion2-56.onion")
        self.assertEqual(database['client3']['onionAddress'], "crazy_onion3.onion")


class GivenNonTlsBroker(GivenBroker):
    def setUp(self) -> None:
        self.run_broker("insecure")
        self.run_insecure_subscriber()

    def test_when_agent_publishes_should_get_hostname_from_subscriber(self):
        self.insecure_publish("client1", "crazy_onion.onion")

        database = self.loadDatabase()
        self.assertEqual(database['client1']['onionAddress'], "crazy_onion.onion")

    def test_when_agent_publishes_should_get_hostname_from_subscriber2(self):
        self.insecure_publish("client2", "crazy_onion2.onion")

        database = self.loadDatabase()
        self.assertEqual(database['client2']['onionAddress'], "crazy_onion2.onion")

    def test_when_agent_publishes_multiple_hosts_should_provide_latest(self):
        self.insecure_publish("client2", "crazy_onion2-34.onion")
        self.insecure_publish("client3", "crazy_onion3.onion")
        self.insecure_publish("client1", "crazy_onion1.onion")
        self.insecure_publish("client2", "crazy_onion2-56.onion")
        self.insecure_publish("client3", "crazy_onion3.onion")

        database = self.loadDatabase()
        self.assertEqual(database['client1']['onionAddress'], "crazy_onion1.onion")
        self.assertEqual(database['client2']['onionAddress'], "crazy_onion2-56.onion")
        self.assertEqual(database['client3']['onionAddress'], "crazy_onion3.onion")

    @staticmethod
    def insecure_publish(client_id, onion_address):
        publish(client_id, onion_address, use_tls=False)


if __name__ == '__main__':
    unittest.main()