# -*- coding: utf-8 -*-
#
# Copyright (C) 2021 Chris Caron <lead2gold@gmail.com>
# All rights reserved.
#
# This code is licensed under the MIT License.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files(the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions :
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

import logging
import re
import sys
import ssl
from unittest.mock import call, Mock, ANY

import pytest

import apprise
from apprise.plugins.NotifyMQTT import NotifyMQTT

# Disable logging for a cleaner testing output
logging.disable(logging.CRITICAL)


@pytest.fixture
def mqtt_client_mock(mocker):
    """
    Mocks an MQTT client and response and returns the mocked client.
    """

    if "paho" not in sys.modules:
        raise pytest.skip("Requires that `paho-mqtt` is installed")

    # Establish mock of the `publish()` response object.
    publish_result = Mock(**{
        "rc": 0,
        "is_published.return_value": True,
    })

    # Establish mock of the `Client()` object.
    mock_client = Mock(**{
        "connect.return_value": 0,
        "reconnect.return_value": 0,
        "is_connected.return_value": True,
        "publish.return_value": publish_result,
    })
    mocker.patch(
        "paho.mqtt.client.Client", return_value=mock_client)

    return mock_client


@pytest.mark.skipif(
    'paho' in sys.modules,
    reason="Requires that `paho-mqtt` is NOT installed")
def test_plugin_mqtt_paho_import_error():
    """
    Verify `NotifyMQTT` is disabled when `paho.mqtt.client` fails loading.
    """

    # without the library, the object can't be instantiated
    obj = apprise.Apprise.instantiate(
        'mqtt://user:pass@localhost/my/topic')
    assert obj is None


def test_plugin_mqtt_default_success(mqtt_client_mock):
    """
    Verify `NotifyMQTT` succeeds and has appropriate default settings.
    """

    # Instantiate the notifier.
    obj = apprise.Apprise.instantiate(
        'mqtt://localhost:1234/my/topic', suppress_exceptions=False)
    assert isinstance(obj, NotifyMQTT)
    assert obj.url().startswith('mqtt://localhost:1234/my/topic')

    # Verify default settings.
    assert re.search(r'qos=0', obj.url())
    assert re.search(r'version=v3.1.1', obj.url())
    assert re.search(r'session=no', obj.url())
    assert re.search(r'client_id=', obj.url()) is None

    # Verify notification succeeds.
    assert obj.notify(body="test=test") is True

    # Send another notification (a new connection isn't attempted to be
    # established as one already exists)
    assert obj.notify(body="foo=bar") is True

    # Verify the right calls have been made to the MQTT client object.
    assert mqtt_client_mock.mock_calls == [
        call.max_inflight_messages_set(200),
        call.connect('localhost', port=1234, keepalive=30),
        call.loop_start(),
        call.is_connected(),
        call.publish('my/topic', payload='test=test', qos=0, retain=False),
        call.publish().is_published(),
        call.is_connected(),
        call.publish('my/topic', payload='foo=bar', qos=0, retain=False),
        call.publish().is_published(),
    ]


def test_plugin_mqtt_multiple_topics_success(mqtt_client_mock):
    """
    Verify submission to multiple MQTT topics.
    """

    # Designate multiple topic targets.
    obj = apprise.Apprise.instantiate(
        'mqtt://localhost/my/topic,my/other/topic',
        suppress_exceptions=False)

    assert isinstance(obj, NotifyMQTT)
    assert obj.url().startswith('mqtt://localhost')
    assert re.search(r'my/topic', obj.url())
    assert re.search(r'my/other/topic', obj.url())
    assert obj.notify(body="test=test") is True

    # Verify the right calls have been made to the MQTT client object.
    assert mqtt_client_mock.mock_calls == [
        call.max_inflight_messages_set(200),
        call.connect('localhost', port=1883, keepalive=30),
        call.loop_start(),
        call.is_connected(),
        call.publish('my/topic', payload='test=test', qos=0, retain=False),
        call.publish().is_published(),
        call.is_connected(),
        call.publish('my/other/topic', payload='test=test', qos=0,
                     retain=False),
        call.publish().is_published(),
    ]


def test_plugin_mqtt_to_success(mqtt_client_mock):
    """
    Verify `NotifyMQTT` succeeds with the `to=` parameter.
    """

    # Leverage the `to=` argument to identify the topic.
    obj = apprise.Apprise.instantiate(
        'mqtt://localhost?to=my/topic', suppress_exceptions=False)
    assert isinstance(obj, NotifyMQTT)
    assert obj.url().startswith('mqtt://localhost/my/topic')

    # Verify default settings.
    assert re.search(r'qos=0', obj.url())
    assert re.search(r'version=v3.1.1', obj.url())

    # Verify notification succeeds.
    assert obj.notify(body="test=test") is True


def test_plugin_mqtt_valid_settings_success(mqtt_client_mock):
    """
    Verify settings as URL parameters will be accepted.
    """

    # Instantiate the notifier.
    obj = apprise.Apprise.instantiate(
        'mqtt://localhost/my/topic?qos=1&version=v3.1',
        suppress_exceptions=False)

    assert isinstance(obj, NotifyMQTT)
    assert obj.url().startswith('mqtt://localhost')
    assert re.search(r'qos=1', obj.url())
    assert re.search(r'version=v3.1', obj.url())


def test_plugin_mqtt_invalid_settings_failure(mqtt_client_mock):
    """
    Verify notifier instantiation croaks on invalid settings.
    """

    # Test case for invalid/unsupported MQTT version.
    with pytest.raises(TypeError):
        apprise.Apprise.instantiate(
            'mqtt://localhost?version=v1.0.0.0', suppress_exceptions=False)

    # Test case for invalid/unsupported `qos`.
    with pytest.raises(TypeError):
        apprise.Apprise.instantiate(
            'mqtt://localhost?qos=123', suppress_exceptions=False)

    with pytest.raises(TypeError):
        apprise.Apprise.instantiate(
            'mqtt://localhost?qos=invalid', suppress_exceptions=False)


def test_plugin_mqtt_bad_url_failure(mqtt_client_mock):
    """
    Verify notifier is disabled when using an invalid URL.
    """
    obj = apprise.Apprise.instantiate('mqtt://', suppress_exceptions=False)
    assert obj is None


def test_plugin_mqtt_no_topic_failure(mqtt_client_mock):
    """
    Verify notification fails when no topic is given.
    """
    obj = apprise.Apprise.instantiate(
        'mqtt://localhost', suppress_exceptions=False)
    assert isinstance(obj, NotifyMQTT)
    assert obj.notify(body="test=test") is False


def test_plugin_mqtt_tls_connect_success(mqtt_client_mock):
    """
    Verify TLS encrypted connections work.
    """

    obj = apprise.Apprise.instantiate(
        'mqtts://user:pass@localhost/my/topic', suppress_exceptions=False)
    assert isinstance(obj, NotifyMQTT)
    assert obj.url().startswith('mqtts://user:pass@localhost/my/topic')
    assert obj.notify(body="test=test") is True

    # Verify the right calls have been made to the MQTT client object.
    assert mqtt_client_mock.mock_calls == [
        call.max_inflight_messages_set(200),
        call.username_pw_set('user', password='pass'),
        call.tls_set(
            ca_certs=ANY,
            certfile=None,
            keyfile=None,
            cert_reqs=ssl.VerifyMode.CERT_REQUIRED,
            tls_version=ssl.PROTOCOL_TLS,
            ciphers=None,
        ),
        call.tls_insecure_set(True),
        call.connect('localhost', port=8883, keepalive=30),
        call.loop_start(),
        call.is_connected(),
        call.publish('my/topic', payload='test=test', qos=0, retain=False),
        call.publish().is_published(),
    ]


def test_plugin_mqtt_tls_no_certificates_failure(mqtt_client_mock, mocker):
    """
    Verify TLS does not work without access to CA root certificates.
    """

    # Clear CA certificates.
    mocker.patch.object(NotifyMQTT, "CA_CERTIFICATE_FILE_LOCATIONS", [])

    obj = apprise.Apprise.instantiate(
        'mqtts://user:pass@localhost/my/topic', suppress_exceptions=False)
    assert isinstance(obj, NotifyMQTT)

    logger: Mock = mocker.spy(obj, "logger")

    # Verify notification fails w/o CA certificates.
    assert obj.notify(body="test=test") is False

    assert logger.mock_calls == [
        call.error("MQTT secure communication can not be verified, "
                   "CA certificates file missing")
    ]


def test_plugin_mqtt_tls_no_verify_success(mqtt_client_mock):
    """
    Verify TLS encrypted connections work with `verify=False`.
    """

    # A single user (not password) + no verifying of host
    obj = apprise.Apprise.instantiate(
        'mqtts://user:pass@localhost/my/topic?verify=False',
        suppress_exceptions=False)
    assert isinstance(obj, NotifyMQTT)
    assert obj.notify(body="test=test") is True

    # Verify the right calls have been made to the MQTT client object.
    # Let's only validate the single call of interest is present.
    # Everything else is identical with `test_plugin_mqtt_tls_connect_success`.
    assert call.tls_insecure_set(False) in mqtt_client_mock.mock_calls


def test_plugin_mqtt_session_client_id_success(mqtt_client_mock):
    """
    Verify handling `session=yes` and `client_id=` works.
    """

    obj = apprise.Apprise.instantiate(
        'mqtt://user@localhost/my/topic?session=yes&client_id=apprise',
        suppress_exceptions=False)

    assert isinstance(obj, NotifyMQTT)
    assert obj.url().startswith('mqtt://user@localhost')
    assert re.search(r'my/topic', obj.url())
    assert re.search(r'client_id=apprise', obj.url())
    assert re.search(r'session=yes', obj.url())
    assert obj.notify(body="test=test") is True


def test_plugin_mqtt_connect_failure(mqtt_client_mock):
    """
    Verify `NotifyMQTT` fails when MQTT `connect()` fails.
    """

    # Emulate a situation where the `connect()` method fails.
    mqtt_client_mock.connect.return_value = 2

    obj = apprise.Apprise.instantiate(
        'mqtt://localhost/my/topic', suppress_exceptions=False)

    # Verify notification fails.
    assert obj.notify(body="test=test") is False


def test_plugin_mqtt_reconnect_failure(mqtt_client_mock):
    """
    Verify `NotifyMQTT` fails when MQTT `reconnect()` fails.
    """

    # Emulate a situation where MQTT reconnect fails.
    mqtt_client_mock.reconnect.return_value = 2
    mqtt_client_mock.is_connected.return_value = False

    obj = apprise.Apprise.instantiate(
        'mqtt://localhost/my/topic', suppress_exceptions=False)

    # Verify notification fails.
    assert obj.notify(body="test=test") is False


def test_plugin_mqtt_publish_failure(mqtt_client_mock):
    """
    Verify `NotifyMQTT` fails when MQTT `publish()` fails.
    """

    # Emulate a situation where the `publish()` method fails.
    mqtt_response = mqtt_client_mock.publish.return_value
    mqtt_response.rc = 2

    obj = apprise.Apprise.instantiate(
        'mqtt://localhost/my/topic', suppress_exceptions=False)

    # Verify notification fails.
    assert obj.notify(body="test=test") is False


def test_plugin_mqtt_exception_failure(mqtt_client_mock):
    """
    Verify `NotifyMQTT` fails when an exception happens.
    """

    obj = apprise.Apprise.instantiate(
        'mqtt://localhost/my/topic', suppress_exceptions=False)

    # Emulate a situation where `connect()` raises an exception.
    mqtt_client_mock.connect.return_value = None

    # Verify notification fails.
    for side_effect in (
            ValueError,
            ConnectionError,
            ssl.CertificateError):
        mqtt_client_mock.connect.side_effect = side_effect
        assert obj.notify(body="test=test") is False


def test_plugin_mqtt_not_published_failure(mqtt_client_mock, mocker):
    """
    Verify `NotifyMQTT` fails there if the message has not been published.
    """

    # Speed up testing by making `NotifyMQTT` not block anywhere.
    mocker.patch.object(NotifyMQTT, "socket_read_timeout", 0.00025)
    mocker.patch.object(NotifyMQTT, "mqtt_block_time_sec", 0)

    # Emulate a situation where `is_published()` returns `False`.
    mqtt_response = mqtt_client_mock.publish.return_value
    mqtt_response.is_published.return_value = False

    obj = apprise.Apprise.instantiate(
        'mqtt://localhost/my/topic', suppress_exceptions=False)

    # Verify notification fails.
    assert obj.notify(body="test=test") is False


def test_plugin_mqtt_not_published_recovery_success(mqtt_client_mock):
    """
    Verify `NotifyMQTT` success after recovering from is_published==False.
    """

    # Emulate a situation where `is_published()` returns `False`.
    mqtt_response = mqtt_client_mock.publish.return_value
    mqtt_response.is_published.return_value = None
    mqtt_response.is_published.side_effect = (False, True)

    obj = apprise.Apprise.instantiate(
        'mqtt://localhost/my/topic', suppress_exceptions=False)

    # Verify notification fails.
    assert obj.notify(body="test=test") is True