from __future__ import print_function
from __future__ import unicode_literals
from builtins import str
import re
import os
import sys
import ssl
import paho.mqtt.client as mqtt
from threading import Thread, Event


try:
    import IDF
except ImportError:
    # this is a test case write with tiny-test-fw.
    # to run test cases outside tiny-test-fw,
    # we need to set environment variable `TEST_FW_PATH`,
    # then get and insert `TEST_FW_PATH` to sys path before import FW module
    test_fw_path = os.getenv("TEST_FW_PATH")
    if test_fw_path and test_fw_path not in sys.path:
        sys.path.insert(0, test_fw_path)
    import IDF

import DUT


event_client_connected = Event()
event_stop_client = Event()
event_client_received_correct = Event()
event_client_received_binary = Event()
message_log = ""


# The callback for when the client receives a CONNACK response from the server.
def on_connect(client, userdata, flags, rc):
    print("Connected with result code " + str(rc))
    event_client_connected.set()
    client.subscribe("/topic/qos0")


def mqtt_client_task(client):
    while not event_stop_client.is_set():
        client.loop()


# The callback for when a PUBLISH message is received from the server.
def on_message(client, userdata, msg):
    global message_log
    global event_client_received_correct
    global event_client_received_binary
    if msg.topic == "/topic/binary":
        binary = userdata
        size = os.path.getsize(binary)
        print("Receiving binary from esp and comparing with {}, size {}...".format(binary, size))
        with open(binary, "rb") as f:
            bin = f.read()
            if bin == msg.payload[:size]:
                print("...matches!")
                event_client_received_binary.set()
                return
            else:
                recv_binary = binary + ".received"
                with open(recv_binary, "w") as fw:
                    fw.write(msg.payload)
                raise ValueError('Received binary (saved as: {}) does not match the original file: {}'.format(recv_binary, binary))
    payload = msg.payload.decode()
    if not event_client_received_correct.is_set() and payload == "data":
        client.subscribe("/topic/binary")
        client.publish("/topic/qos0", "send binary please")
        if msg.topic == "/topic/qos0" and payload == "data":
            event_client_received_correct.set()
    message_log += "Received data:" + msg.topic + " " + payload + "\n"


@IDF.idf_example_test(env_tag="Example_WIFI")
def test_examples_protocol_mqtt_ssl(env, extra_data):
    broker_url = ""
    broker_port = 0
    """
    steps: |
      1. join AP and connects to ssl broker
      2. Test connects a client to the same broker
      3. Test evaluates python client received correct qos0 message
      4. Test ESP32 client received correct qos0 message
      5. Test python client receives binary data from running partition and compares it with the binary
    """
    dut1 = env.get_dut("mqtt_ssl", "examples/protocols/mqtt/ssl")
    # check and log bin size
    binary_file = os.path.join(dut1.app.binary_path, "mqtt_ssl.bin")
    bin_size = os.path.getsize(binary_file)
    IDF.log_performance("mqtt_ssl_bin_size", "{}KB"
                        .format(bin_size // 1024))
    IDF.check_performance("mqtt_ssl_size", bin_size // 1024)
    # Look for host:port in sdkconfig
    try:
        value = re.search(r'\:\/\/([^:]+)\:([0-9]+)', dut1.app.get_sdkconfig()["CONFIG_BROKER_URI"])
        broker_url = value.group(1)
        broker_port = int(value.group(2))
    except Exception:
        print('ENV_TEST_FAILURE: Cannot find broker url in sdkconfig')
        raise
    client = None
    # 1. Test connects to a broker
    try:
        client = mqtt.Client()
        client.on_connect = on_connect
        client.on_message = on_message
        client.user_data_set(binary_file)
        client.tls_set(None,
                       None,
                       None, cert_reqs=ssl.CERT_NONE, tls_version=ssl.PROTOCOL_TLSv1_2, ciphers=None)
        client.tls_insecure_set(True)
        print("Connecting...")
        client.connect(broker_url, broker_port, 60)
    except Exception:
        print("ENV_TEST_FAILURE: Unexpected error while connecting to broker {}: {}:".format(broker_url, sys.exc_info()[0]))
        raise
    # Starting a py-client in a separate thread
    thread1 = Thread(target=mqtt_client_task, args=(client,))
    thread1.start()
    try:
        print("Connecting py-client to broker {}:{}...".format(broker_url, broker_port))
        if not event_client_connected.wait(timeout=30):
            raise ValueError("ENV_TEST_FAILURE: Test script cannot connect to broker: {}".format(broker_url))
        dut1.start_app()
        try:
            ip_address = dut1.expect(re.compile(r" sta ip: ([^,]+),"), timeout=30)
            print("Connected to AP with IP: {}".format(ip_address))
        except DUT.ExpectTimeout:
            print('ENV_TEST_FAILURE: Cannot connect to AP')
            raise
        print("Checking py-client received msg published from esp...")
        if not event_client_received_correct.wait(timeout=30):
            raise ValueError('Wrong data received, msg log: {}'.format(message_log))
        print("Checking esp-client received msg published from py-client...")
        dut1.expect(re.compile(r"DATA=send binary please"), timeout=30)
        print("Receiving binary data from running partition...")
        if not event_client_received_binary.wait(timeout=30):
            raise ValueError('Binary not received within timeout')
    finally:
        event_stop_client.set()
        thread1.join()


if __name__ == '__main__':
    test_examples_protocol_mqtt_ssl()