# Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Tests NotificationProcessor"""

import mock
import multiprocessing
import time
import unittest

from monasca_notification.notification import Notification
from monasca_notification.processors import notification_processor


class smtpStub(object):
    def __init__(self, log_queue):
        self.queue = log_queue

    def sendmail(self, from_addr, to_addr, msg):
        self.queue.put("%s %s %s" % (from_addr, to_addr, msg))


class requestsResponse(object):
    def __init__(self, status):
        self.status_code = status


class TestStateTracker(unittest.TestCase):

    def setUp(self):
        self.trap = []
        self.notification_queue = multiprocessing.Queue(10)
        self.sent_notification_queue = multiprocessing.Queue(10)
        self.finished_queue = multiprocessing.Queue(10)
        self.log_queue = multiprocessing.Queue(10)
        self.email_config = {'server': 'my.smtp.server',
                             'port': 25,
                             'user': None,
                             'password': None,
                             'timeout': 60,
                             'from_addr': 'hpcs.mon@hp.com'}

    def tearDown(self):
        self.assertTrue(self.log_queue.empty())
        self.assertTrue(self.sent_notification_queue.empty())
        self.assertTrue(self.finished_queue.empty())
        self.processor.terminate()

    # ------------------------------------------------------------------------
    # Test helper functions
    # ------------------------------------------------------------------------

    @mock.patch('monasca_notification.types.notifiers.email_notifier.smtplib')
    @mock.patch('monasca_notification.processors.notification_processor.notifiers.log')
    def _start_processor(self, mock_log, mock_smtp):
        """Start the processor with the proper mocks
        """
        # Since the log runs in another thread I can mock it directly, instead change the methods to put to a queue
        mock_log.warn = self.log_queue.put
        mock_log.error = self.log_queue.put

        mock_smtp.SMTP = self._smtpStub

        config = {}
        config["email"] = self.email_config

        nprocessor = (notification_processor.
                      NotificationProcessor(self.notification_queue,
                                            self.sent_notification_queue,
                                            self.finished_queue,
                                            config))

        self.processor = multiprocessing.Process(target=nprocessor.run)
        self.processor.start()

    def _smtpStub(self, *arg, **kwargs):
        return smtpStub(self.log_queue)

    def email_setup(self, metric):
        alarm_dict = {"tenantId": "0",
                      "alarmId": "0",
                      "alarmName": "test Alarm",
                      "oldState": "OK",
                      "newState": "ALARM",
                      "stateChangeReason": "I am alarming!",
                      "timestamp": time.time(),
                      "metrics": metric}

        notification = Notification('email', 0, 1, 'email notification', 'me@here.com', alarm_dict)

        self.notification_queue.put([notification])
        self._start_processor()

    def _logQueueToTrap(self):
        while True:
            try:
                self.trap.append(self.log_queue.get(timeout=1))
            except Exception:
                return

    # ------------------------------------------------------------------------
    # Unit tests
    # ------------------------------------------------------------------------

    def test_invalid_notification(self):
        """Verify invalid notification type is rejected.
        """
        alarm_dict = {"tenantId": "0", "alarmId": "0", "alarmName": "test Alarm", "oldState": "OK", "newState": "ALARM",
                      "stateChangeReason": "I am alarming!", "timestamp": time.time(), "metrics": "cpu_util"}
        invalid_notification = Notification('invalid', 0, 1, 'test notification', 'me@here.com', alarm_dict)

        self.notification_queue.put([invalid_notification])
        self._start_processor()

        finished = self.finished_queue.get(timeout=2)

        self._logQueueToTrap()

        self.assertTrue(finished == (0, 1))
        self.assertIn('attempting to send unconfigured notification: invalid', self.trap)

    def test_email_notification_single_host(self):
        """Email with single host
        """

        metrics = []
        metric_data = {'dimensions': {'hostname': 'foo1', 'service': 'bar1'}}
        metrics.append(metric_data)

        self.email_setup(metrics)

        self._logQueueToTrap()

        for msg in self.trap:
            if "From: hpcs.mon@hp.com" in msg:
                self.assertRegexpMatches(msg, "From: hpcs.mon@hp.com")
                self.assertRegexpMatches(msg, "To: me@here.com")
                self.assertRegexpMatches(msg, "Content-Type: text/plain")
                self.assertRegexpMatches(msg, "Alarm .test Alarm.")
                self.assertRegexpMatches(msg, "On host .foo1.")

        notification_msg = self.sent_notification_queue.get(timeout=3)
        self.assertNotEqual(notification_msg, None)