"""Support for OpenUV binary sensors."""
import logging

from homeassistant.components.binary_sensor import BinarySensorDevice
from homeassistant.core import callback
from homeassistant.helpers.dispatcher import async_dispatcher_connect
from homeassistant.util.dt import as_local, parse_datetime, utcnow

from . import (
    BINARY_SENSORS, DATA_OPENUV_CLIENT, DATA_PROTECTION_WINDOW, DOMAIN,
    TOPIC_UPDATE, TYPE_PROTECTION_WINDOW, OpenUvEntity)

_LOGGER = logging.getLogger(__name__)
ATTR_PROTECTION_WINDOW_ENDING_TIME = 'end_time'
ATTR_PROTECTION_WINDOW_ENDING_UV = 'end_uv'
ATTR_PROTECTION_WINDOW_STARTING_TIME = 'start_time'
ATTR_PROTECTION_WINDOW_STARTING_UV = 'start_uv'


async def async_setup_platform(
        hass, config, async_add_entities, discovery_info=None):
    """Set up an OpenUV sensor based on existing config."""
    pass


async def async_setup_entry(hass, entry, async_add_entities):
    """Set up an OpenUV sensor based on a config entry."""
    openuv = hass.data[DOMAIN][DATA_OPENUV_CLIENT][entry.entry_id]

    binary_sensors = []
    for sensor_type in openuv.binary_sensor_conditions:
        name, icon = BINARY_SENSORS[sensor_type]
        binary_sensors.append(
            OpenUvBinarySensor(
                openuv, sensor_type, name, icon, entry.entry_id))

    async_add_entities(binary_sensors, True)


class OpenUvBinarySensor(OpenUvEntity, BinarySensorDevice):
    """Define a binary sensor for OpenUV."""

    def __init__(self, openuv, sensor_type, name, icon, entry_id):
        """Initialize the sensor."""
        super().__init__(openuv)

        self._async_unsub_dispatcher_connect = None
        self._entry_id = entry_id
        self._icon = icon
        self._latitude = openuv.client.latitude
        self._longitude = openuv.client.longitude
        self._name = name
        self._sensor_type = sensor_type
        self._state = None

    @property
    def icon(self):
        """Return the icon."""
        return self._icon

    @property
    def is_on(self):
        """Return the status of the sensor."""
        return self._state

    @property
    def should_poll(self):
        """Disable polling."""
        return False

    @property
    def unique_id(self) -> str:
        """Return a unique, HASS-friendly identifier for this entity."""
        return '{0}_{1}_{2}'.format(
            self._latitude, self._longitude, self._sensor_type)

    async def async_added_to_hass(self):
        """Register callbacks."""
        @callback
        def update():
            """Update the state."""
            self.async_schedule_update_ha_state(True)

        self._async_unsub_dispatcher_connect = async_dispatcher_connect(
            self.hass, TOPIC_UPDATE, update)

    async def async_will_remove_from_hass(self):
        """Disconnect dispatcher listener when removed."""
        if self._async_unsub_dispatcher_connect:
            self._async_unsub_dispatcher_connect()

    async def async_update(self):
        """Update the state."""
        data = self.openuv.data[DATA_PROTECTION_WINDOW]

        if not data:
            return

        if self._sensor_type == TYPE_PROTECTION_WINDOW:
            self._state = parse_datetime(
                data['from_time']) <= utcnow() <= parse_datetime(
                    data['to_time'])
            self._attrs.update({
                ATTR_PROTECTION_WINDOW_ENDING_TIME:
                    as_local(parse_datetime(data['to_time'])),
                ATTR_PROTECTION_WINDOW_ENDING_UV: data['to_uv'],
                ATTR_PROTECTION_WINDOW_STARTING_UV: data['from_uv'],
                ATTR_PROTECTION_WINDOW_STARTING_TIME:
                    as_local(parse_datetime(data['from_time'])),
            })
