"""Test the helper method for writing tests."""
import os
from datetime import timedelta
from unittest import mock

from homeassistant import core as ha, loader
from homeassistant.helpers.entity import ToggleEntity
from homeassistant.const import (
    STATE_ON, STATE_OFF, DEVICE_DEFAULT_NAME, EVENT_TIME_CHANGED,
    EVENT_STATE_CHANGED, EVENT_PLATFORM_DISCOVERED, ATTR_SERVICE,
    ATTR_DISCOVERED, SERVER_PORT)
from homeassistant.components import sun, mqtt

_TEST_INSTANCE_PORT = SERVER_PORT


def get_test_config_dir():
    """Return a path to a test config dir."""
    return os.path.join(os.path.dirname(__file__), "config")


def get_test_home_assistant(num_threads=None):
    """Return a Home Assistant object pointing at test config dir."""
    if num_threads:
        orig_num_threads = ha.MIN_WORKER_THREAD
        ha.MIN_WORKER_THREAD = num_threads

    hass = ha.HomeAssistant()

    if num_threads:
        ha.MIN_WORKER_THREAD = orig_num_threads

    hass.config.config_dir = get_test_config_dir()
    hass.config.latitude = 32.87336
    hass.config.longitude = -117.22743

    if 'custom_components.test' not in loader.AVAILABLE_COMPONENTS:
        loader.prepare(hass)

    return hass


def get_test_instance_port():
    """Return unused port for running test instance.

    The socket that holds the default port does not get released when we stop
    HA in a different test case. Until I have figured out what is going on,
    let's run each test on a different port.
    """
    global _TEST_INSTANCE_PORT
    _TEST_INSTANCE_PORT += 1
    return _TEST_INSTANCE_PORT


def mock_service(hass, domain, service):
    """Setup a fake service.

    Return a list that logs all calls to fake service.
    """
    calls = []

    hass.services.register(
        domain, service, lambda call: calls.append(call))

    return calls


def fire_mqtt_message(hass, topic, payload, qos=0):
    """Fire the MQTT message."""
    hass.bus.fire(mqtt.EVENT_MQTT_MESSAGE_RECEIVED, {
        mqtt.ATTR_TOPIC: topic,
        mqtt.ATTR_PAYLOAD: payload,
        mqtt.ATTR_QOS: qos,
    })


def fire_time_changed(hass, time):
    """Fire a time changes event."""
    hass.bus.fire(EVENT_TIME_CHANGED, {'now': time})


def fire_service_discovered(hass, service, info):
    """Fire the MQTT message."""
    hass.bus.fire(EVENT_PLATFORM_DISCOVERED, {
        ATTR_SERVICE: service,
        ATTR_DISCOVERED: info
    })


def ensure_sun_risen(hass):
    """Trigger sun to rise if below horizon."""
    if sun.is_on(hass):
        return
    fire_time_changed(hass, sun.next_rising_utc(hass) + timedelta(seconds=10))


def ensure_sun_set(hass):
    """Trigger sun to set if above horizon."""
    if not sun.is_on(hass):
        return
    fire_time_changed(hass, sun.next_setting_utc(hass) + timedelta(seconds=10))


def mock_state_change_event(hass, new_state, old_state=None):
    """Mock state change envent."""
    event_data = {
        'entity_id': new_state.entity_id,
        'new_state': new_state,
    }

    if old_state:
        event_data['old_state'] = old_state

    hass.bus.fire(EVENT_STATE_CHANGED, event_data)


def mock_http_component(hass):
    """Mock the HTTP component."""
    hass.http = MockHTTP()
    hass.config.components.append('http')


@mock.patch('homeassistant.components.mqtt.MQTT')
def mock_mqtt_component(hass, mock_mqtt):
    """Mock the MQTT component."""
    mqtt.setup(hass, {
        mqtt.DOMAIN: {
            mqtt.CONF_BROKER: 'mock-broker',
        }
    })
    hass.config.components.append(mqtt.DOMAIN)
    return mock_mqtt


class MockHTTP(object):
    """Mock the HTTP module."""

    def register_path(self, method, url, callback, require_auth=True):
        """Register a path."""
        pass


class MockModule(object):
    """Representation of a fake module."""

    def __init__(self, domain=None, dependencies=[], setup=None):
        """Initialize the mock module."""
        self.DOMAIN = domain
        self.DEPENDENCIES = dependencies
        # Setup a mock setup if none given.
        if setup is None:
            self.setup = lambda hass, config: True
        else:
            self.setup = setup


class MockPlatform(object):
    """Provide a fake platform."""

    def __init__(self, setup_platform=None, dependencies=[]):
        """Initialize the platform."""
        self.DEPENDENCIES = dependencies
        self._setup_platform = setup_platform

    def setup_platform(self, hass, config, add_devices, discovery_info=None):
        """Setup the platform."""
        if self._setup_platform is not None:
            self._setup_platform(hass, config, add_devices, discovery_info)


class MockToggleDevice(ToggleEntity):
    """Provide a mock toggle device."""

    def __init__(self, name, state):
        """Initialize the mock device."""
        self._name = name or DEVICE_DEFAULT_NAME
        self._state = state
        self.calls = []

    @property
    def name(self):
        """Return the name of the device if any."""
        self.calls.append(('name', {}))
        return self._name

    @property
    def state(self):
        """Return the name of the device if any."""
        self.calls.append(('state', {}))
        return self._state

    @property
    def is_on(self):
        """Return true if device is on."""
        self.calls.append(('is_on', {}))
        return self._state == STATE_ON

    def turn_on(self, **kwargs):
        """Turn the device on."""
        self.calls.append(('turn_on', kwargs))
        self._state = STATE_ON

    def turn_off(self, **kwargs):
        """Turn the device off."""
        self.calls.append(('turn_off', kwargs))
        self._state = STATE_OFF

    def last_call(self, method=None):
        """Return the last call."""
        if not self.calls:
            return None
        elif method is None:
            return self.calls[-1]
        else:
            try:
                return next(call for call in reversed(self.calls)
                            if call[0] == method)
            except StopIteration:
                return None