"""
tests.test_component_logbook
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Tests the logbook component.
"""
# pylint: disable=protected-access,too-many-public-methods
import unittest
from datetime import timedelta

import homeassistant as ha
from homeassistant.const import (
    EVENT_STATE_CHANGED, EVENT_HOMEASSISTANT_START, EVENT_HOMEASSISTANT_STOP)
import homeassistant.util.dt as dt_util
from homeassistant.components import logbook, http

from helpers import get_test_home_assistant

SERVER_PORT = 8127


class TestComponentHistory(unittest.TestCase):
    """ Tests homeassistant.components.history module. """

    def test_setup(self):
        """ Test setup method. """
        try:
            hass = get_test_home_assistant()
            http.setup(hass, {
                http.DOMAIN: {http.CONF_SERVER_PORT: SERVER_PORT}})
            self.assertTrue(logbook.setup(hass, {}))
        finally:
            hass.stop()

    def test_humanify_filter_sensor(self):
        """ Test humanify filter too frequent sensor values. """
        entity_id = 'sensor.bla'

        pointA = dt_util.strip_microseconds(dt_util.utcnow().replace(minute=2))
        pointB = pointA.replace(minute=5)
        pointC = pointA + timedelta(minutes=logbook.GROUP_BY_MINUTES)

        eventA = self.create_state_changed_event(pointA, entity_id, 10)
        eventB = self.create_state_changed_event(pointB, entity_id, 20)
        eventC = self.create_state_changed_event(pointC, entity_id, 30)

        entries = list(logbook.humanify((eventA, eventB, eventC)))

        self.assertEqual(2, len(entries))
        self.assert_entry(
            entries[0], pointB, 'bla', domain='sensor', entity_id=entity_id)

        self.assert_entry(
            entries[1], pointC, 'bla', domain='sensor', entity_id=entity_id)

    def test_home_assistant_start_stop_grouped(self):
        """ Tests if home assistant start and stop events are grouped if
            occuring in the same minute. """
        entries = list(logbook.humanify((
            ha.Event(EVENT_HOMEASSISTANT_STOP),
            ha.Event(EVENT_HOMEASSISTANT_START),
            )))

        self.assertEqual(1, len(entries))
        self.assert_entry(
            entries[0], name='Home Assistant', message='restarted',
            domain=ha.DOMAIN)

    def assert_entry(self, entry, when=None, name=None, message=None,
                     domain=None, entity_id=None):
        """ Asserts an entry is what is expected """
        if when:
            self.assertEqual(when, entry.when)

        if name:
            self.assertEqual(name, entry.name)

        if message:
            self.assertEqual(message, entry.message)

        if domain:
            self.assertEqual(domain, entry.domain)

        if entity_id:
            self.assertEqual(entity_id, entry.entity_id)

    def create_state_changed_event(self, event_time_fired, entity_id, state):
        """ Create state changed event. """

        # Logbook only cares about state change events that
        # contain an old state but will not actually act on it.
        state = ha.State(entity_id, state).as_dict()

        return ha.Event(EVENT_STATE_CHANGED, {
            'entity_id': entity_id,
            'old_state': state,
            'new_state': state,
        }, time_fired=event_time_fired)