"""Support for Minut Point binary sensors."""
import logging

from homeassistant.components.binary_sensor import DOMAIN, BinarySensorDevice
from homeassistant.components.point import MinutPointEntity
from homeassistant.components.point.const import (
    DOMAIN as POINT_DOMAIN, POINT_DISCOVERY_NEW, SIGNAL_WEBHOOK)
from homeassistant.core import callback
from homeassistant.helpers.dispatcher import async_dispatcher_connect

_LOGGER = logging.getLogger(__name__)

EVENTS = {
    'battery':  # On means low, Off means normal
    ('battery_low', ''),
    'button_press':  # On means the button was pressed, Off means normal
    ('short_button_press', ''),
    'cold':  # On means cold, Off means normal
    ('temperature_low', 'temperature_risen_normal'),
    'connectivity':  # On means connected, Off means disconnected
    ('device_online', 'device_offline'),
    'dry':  # On means too dry, Off means normal
    ('humidity_low', 'humidity_risen_normal'),
    'heat':  # On means hot, Off means normal
    ('temperature_high', 'temperature_dropped_normal'),
    'moisture':  # On means wet, Off means dry
    ('humidity_high', 'humidity_dropped_normal'),
    'sound':  # On means sound detected, Off means no sound (clear)
    ('avg_sound_high', 'sound_level_dropped_normal'),
    'tamper':  # On means the point was removed or attached
    ('tamper', ''),
}


async def async_setup_entry(hass, config_entry, async_add_entities):
    """Set up a Point's binary sensors based on a config entry."""
    async def async_discover_sensor(device_id):
        """Discover and add a discovered sensor."""
        client = hass.data[POINT_DOMAIN][config_entry.entry_id]
        async_add_entities(
            (MinutPointBinarySensor(client, device_id, device_class)
             for device_class in EVENTS), True)

    async_dispatcher_connect(
        hass, POINT_DISCOVERY_NEW.format(DOMAIN, POINT_DOMAIN),
        async_discover_sensor)


class MinutPointBinarySensor(MinutPointEntity, BinarySensorDevice):
    """The platform class required by Home Assistant."""

    def __init__(self, point_client, device_id, device_class):
        """Initialize the binary sensor."""
        super().__init__(point_client, device_id, device_class)

        self._async_unsub_hook_dispatcher_connect = None
        self._events = EVENTS[device_class]
        self._is_on = None

    async def async_added_to_hass(self):
        """Call when entity is added to HOme Assistant."""
        await super().async_added_to_hass()
        self._async_unsub_hook_dispatcher_connect = async_dispatcher_connect(
            self.hass, SIGNAL_WEBHOOK, self._webhook_event)

    async def async_will_remove_from_hass(self):
        """Disconnect dispatcher listener when removed."""
        await super().async_will_remove_from_hass()
        if self._async_unsub_hook_dispatcher_connect:
            self._async_unsub_hook_dispatcher_connect()

    async def _update_callback(self):
        """Update the value of the sensor."""
        if not self.is_updated:
            return
        if self._events[0] in self.device.ongoing_events:
            self._is_on = True
        else:
            self._is_on = None
        self.async_schedule_update_ha_state()

    @callback
    def _webhook_event(self, data, webhook):
        """Process new event from the webhook."""
        if self.device.webhook != webhook:
            return
        _type = data.get('event', {}).get('type')
        _device_id = data.get('event', {}).get('device_id')
        if _type not in self._events or _device_id != self.device.device_id:
            return
        _LOGGER.debug("Recieved webhook: %s", _type)
        if _type == self._events[0]:
            self._is_on = True
        if _type == self._events[1]:
            self._is_on = None
        self.async_schedule_update_ha_state()

    @property
    def is_on(self):
        """Return the state of the binary sensor."""
        if self.device_class == 'connectivity':
            # connectivity is the other way around.
            return not self._is_on
        return self._is_on