"""
homeassistant.components.chromecast
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Provides functionality to interact with Chromecasts.
"""
import logging

from homeassistant.external import pychromecast

import homeassistant as ha
import homeassistant.util as util


DOMAIN = "chromecast"

SERVICE_YOUTUBE_VIDEO = "play_youtube_video"

ENTITY_ID_FORMAT = DOMAIN + '.{}'
STATE_NO_APP = "none"

ATTR_FRIENDLY_NAME = "friendly_name"
ATTR_HOST = "host"
ATTR_STATE = "state"
ATTR_OPTIONS = "options"


def turn_off(statemachine, cc_id=None):
    """ Exits any running app on the specified ChromeCast and shows
    idle screen. Will quit all ChromeCasts if nothing specified. """

    entity_ids = [ENTITY_ID_FORMAT.format(cc_id)] if cc_id \
        else ha.filter_entity_ids(statemachine.entity_ids, DOMAIN)

    for entity_id in entity_ids:
        state = statemachine.get_state(entity_id)

        if (state and
            (state.state != STATE_NO_APP or
             state.state != pychromecast.APP_ID_HOME)):

            pychromecast.quit_app(state.attributes[ATTR_HOST])


def setup(bus, statemachine, host):
    """ Listen for chromecast events. """
    logger = logging.getLogger(__name__)

    logger.info("Getting device status")
    device = pychromecast.get_device_status(host)

    if not device:
        logger.error("Could not find Chromecast")
        return False

    entity = ENTITY_ID_FORMAT.format(util.slugify(
        device.friendly_name))

    bus.register_service(DOMAIN, ha.SERVICE_TURN_OFF,
                         lambda service:
                         turn_off(statemachine,
                                  service.data.get("cc_id", None)))

    bus.register_service(DOMAIN, "start_fireplace",
                         lambda service:
                         pychromecast.play_youtube_video(host, "eyU3bRy2x44"))

    bus.register_service(DOMAIN, "start_epic_sax",
                         lambda service:
                         pychromecast.play_youtube_video(host, "kxopViU98Xo"))

    bus.register_service(DOMAIN, SERVICE_YOUTUBE_VIDEO,
                         lambda service:
                         pychromecast.play_youtube_video(
                             host, service.data['video']))

    def update_chromecast_state(time):  # pylint: disable=unused-argument
        """ Retrieve state of Chromecast and update statemachine. """
        logger.info("Updating app status")
        status = pychromecast.get_app_status(host)

        if status:
            statemachine.set_state(entity, status.name,
                                   {ATTR_FRIENDLY_NAME:
                                       pychromecast.get_friendly_name(
                                           status.name),
                                    ATTR_HOST: host,
                                    ATTR_STATE: status.state,
                                    ATTR_OPTIONS: status.options})
        else:
            statemachine.set_state(entity, STATE_NO_APP, {ATTR_HOST: host})

    ha.track_time_change(bus, update_chromecast_state)

    update_chromecast_state(None)

    return True