"""Binary sensors on Zigbee Home Automation networks."""
import logging

from homeassistant.components.binary_sensor import (
    DEVICE_CLASS_GAS,
    DEVICE_CLASS_MOISTURE,
    DEVICE_CLASS_MOTION,
    DEVICE_CLASS_MOVING,
    DEVICE_CLASS_OCCUPANCY,
    DEVICE_CLASS_OPENING,
    DEVICE_CLASS_SMOKE,
    DEVICE_CLASS_VIBRATION,
    DOMAIN,
    BinarySensorDevice,
)
from homeassistant.const import STATE_ON
from homeassistant.core import callback
from homeassistant.helpers.dispatcher import async_dispatcher_connect

from .core.const import (
    CHANNEL_ATTRIBUTE,
    CHANNEL_ON_OFF,
    CHANNEL_ZONE,
    DATA_ZHA,
    DATA_ZHA_DISPATCHERS,
    SENSOR_ACCELERATION,
    SENSOR_OCCUPANCY,
    SENSOR_OPENING,
    SENSOR_TYPE,
    SIGNAL_ATTR_UPDATED,
    UNKNOWN,
    ZHA_DISCOVERY_NEW,
    ZONE,
)
from .entity import ZhaEntity

_LOGGER = logging.getLogger(__name__)

# Zigbee Cluster Library Zone Type to Home Assistant device class
CLASS_MAPPING = {
    0x000D: DEVICE_CLASS_MOTION,
    0x0015: DEVICE_CLASS_OPENING,
    0x0028: DEVICE_CLASS_SMOKE,
    0x002A: DEVICE_CLASS_MOISTURE,
    0x002B: DEVICE_CLASS_GAS,
    0x002D: DEVICE_CLASS_VIBRATION,
}


async def get_ias_device_class(channel):
    """Get the HA device class from the channel."""
    zone_type = await channel.get_attribute_value("zone_type")
    return CLASS_MAPPING.get(zone_type)


DEVICE_CLASS_REGISTRY = {
    UNKNOWN: None,
    SENSOR_OPENING: DEVICE_CLASS_OPENING,
    ZONE: get_ias_device_class,
    SENSOR_OCCUPANCY: DEVICE_CLASS_OCCUPANCY,
    SENSOR_ACCELERATION: DEVICE_CLASS_MOVING,
}


async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
    """Old way of setting up Zigbee Home Automation binary sensors."""
    pass


async def async_setup_entry(hass, config_entry, async_add_entities):
    """Set up the Zigbee Home Automation binary sensor from config entry."""

    async def async_discover(discovery_info):
        await _async_setup_entities(
            hass, config_entry, async_add_entities, [discovery_info]
        )

    unsub = async_dispatcher_connect(
        hass, ZHA_DISCOVERY_NEW.format(DOMAIN), async_discover
    )
    hass.data[DATA_ZHA][DATA_ZHA_DISPATCHERS].append(unsub)

    binary_sensors = hass.data.get(DATA_ZHA, {}).get(DOMAIN)
    if binary_sensors is not None:
        await _async_setup_entities(
            hass, config_entry, async_add_entities, binary_sensors.values()
        )
        del hass.data[DATA_ZHA][DOMAIN]


async def _async_setup_entities(
    hass, config_entry, async_add_entities, discovery_infos
):
    """Set up the ZHA binary sensors."""
    entities = []
    for discovery_info in discovery_infos:
        entities.append(BinarySensor(**discovery_info))

    async_add_entities(entities, update_before_add=True)


class BinarySensor(ZhaEntity, BinarySensorDevice):
    """ZHA BinarySensor."""

    _domain = DOMAIN
    _device_class = None

    def __init__(self, **kwargs):
        """Initialize the ZHA binary sensor."""
        super().__init__(**kwargs)
        self._device_state_attributes = {}
        self._zone_channel = self.cluster_channels.get(CHANNEL_ZONE)
        self._on_off_channel = self.cluster_channels.get(CHANNEL_ON_OFF)
        self._attr_channel = self.cluster_channels.get(CHANNEL_ATTRIBUTE)
        self._zha_sensor_type = kwargs[SENSOR_TYPE]

    async def _determine_device_class(self):
        """Determine the device class for this binary sensor."""
        device_class_supplier = DEVICE_CLASS_REGISTRY.get(self._zha_sensor_type)
        if callable(device_class_supplier):
            channel = self.cluster_channels.get(self._zha_sensor_type)
            if channel is None:
                return None
            return await device_class_supplier(channel)
        return device_class_supplier

    async def async_added_to_hass(self):
        """Run when about to be added to hass."""
        self._device_class = await self._determine_device_class()
        await super().async_added_to_hass()
        if self._on_off_channel:
            await self.async_accept_signal(
                self._on_off_channel, SIGNAL_ATTR_UPDATED, self.async_set_state
            )
        if self._zone_channel:
            await self.async_accept_signal(
                self._zone_channel, SIGNAL_ATTR_UPDATED, self.async_set_state
            )
        if self._attr_channel:
            await self.async_accept_signal(
                self._attr_channel, SIGNAL_ATTR_UPDATED, self.async_set_state
            )

    @callback
    def async_restore_last_state(self, last_state):
        """Restore previous state."""
        super().async_restore_last_state(last_state)
        self._state = last_state.state == STATE_ON

    @property
    def is_on(self) -> bool:
        """Return if the switch is on based on the statemachine."""
        if self._state is None:
            return False
        return self._state

    @property
    def device_class(self) -> str:
        """Return device class from component DEVICE_CLASSES."""
        return self._device_class

    def async_set_state(self, state):
        """Set the state."""
        self._state = bool(state)
        self.async_schedule_update_ha_state()

    async def async_update(self):
        """Attempt to retrieve on off state from the binary sensor."""
        await super().async_update()
        if self._on_off_channel:
            self._state = await self._on_off_channel.get_attribute_value("on_off")
        if self._zone_channel:
            value = await self._zone_channel.get_attribute_value("zone_status")
            if value is not None:
                self._state = value & 3
        if self._attr_channel:
            self._state = await self._attr_channel.get_attribute_value(
                self._attr_channel.value_attribute
            )
