"""Support for AlarmDecoder zone states- represented as binary sensors."""
import logging

from homeassistant.components.binary_sensor import BinarySensorDevice

from . import (
    CONF_RELAY_ADDR,
    CONF_RELAY_CHAN,
    CONF_ZONE_LOOP,
    CONF_ZONE_NAME,
    CONF_ZONE_RFID,
    CONF_ZONE_TYPE,
    CONF_ZONES,
    SIGNAL_REL_MESSAGE,
    SIGNAL_RFX_MESSAGE,
    SIGNAL_ZONE_FAULT,
    SIGNAL_ZONE_RESTORE,
    ZONE_SCHEMA,
)

_LOGGER = logging.getLogger(__name__)

ATTR_RF_BIT0 = "rf_bit0"
ATTR_RF_LOW_BAT = "rf_low_battery"
ATTR_RF_SUPERVISED = "rf_supervised"
ATTR_RF_BIT3 = "rf_bit3"
ATTR_RF_LOOP3 = "rf_loop3"
ATTR_RF_LOOP2 = "rf_loop2"
ATTR_RF_LOOP4 = "rf_loop4"
ATTR_RF_LOOP1 = "rf_loop1"


def setup_platform(hass, config, add_entities, discovery_info=None):
    """Set up the AlarmDecoder binary sensor devices."""
    configured_zones = discovery_info[CONF_ZONES]

    devices = []
    for zone_num in configured_zones:
        device_config_data = ZONE_SCHEMA(configured_zones[zone_num])
        zone_type = device_config_data[CONF_ZONE_TYPE]
        zone_name = device_config_data[CONF_ZONE_NAME]
        zone_rfid = device_config_data.get(CONF_ZONE_RFID)
        zone_loop = device_config_data.get(CONF_ZONE_LOOP)
        relay_addr = device_config_data.get(CONF_RELAY_ADDR)
        relay_chan = device_config_data.get(CONF_RELAY_CHAN)
        device = AlarmDecoderBinarySensor(
            zone_num, zone_name, zone_type, zone_rfid, zone_loop, relay_addr, relay_chan
        )
        devices.append(device)

    add_entities(devices)

    return True


class AlarmDecoderBinarySensor(BinarySensorDevice):
    """Representation of an AlarmDecoder binary sensor."""

    def __init__(
        self,
        zone_number,
        zone_name,
        zone_type,
        zone_rfid,
        zone_loop,
        relay_addr,
        relay_chan,
    ):
        """Initialize the binary_sensor."""
        self._zone_number = zone_number
        self._zone_type = zone_type
        self._state = None
        self._name = zone_name
        self._rfid = zone_rfid
        self._loop = zone_loop
        self._rfstate = None
        self._relay_addr = relay_addr
        self._relay_chan = relay_chan

    async def async_added_to_hass(self):
        """Register callbacks."""
        self.hass.helpers.dispatcher.async_dispatcher_connect(
            SIGNAL_ZONE_FAULT, self._fault_callback
        )

        self.hass.helpers.dispatcher.async_dispatcher_connect(
            SIGNAL_ZONE_RESTORE, self._restore_callback
        )

        self.hass.helpers.dispatcher.async_dispatcher_connect(
            SIGNAL_RFX_MESSAGE, self._rfx_message_callback
        )

        self.hass.helpers.dispatcher.async_dispatcher_connect(
            SIGNAL_REL_MESSAGE, self._rel_message_callback
        )

    @property
    def name(self):
        """Return the name of the entity."""
        return self._name

    @property
    def should_poll(self):
        """No polling needed."""
        return False

    @property
    def device_state_attributes(self):
        """Return the state attributes."""
        attr = {}
        if self._rfid and self._rfstate is not None:
            attr[ATTR_RF_BIT0] = bool(self._rfstate & 0x01)
            attr[ATTR_RF_LOW_BAT] = bool(self._rfstate & 0x02)
            attr[ATTR_RF_SUPERVISED] = bool(self._rfstate & 0x04)
            attr[ATTR_RF_BIT3] = bool(self._rfstate & 0x08)
            attr[ATTR_RF_LOOP3] = bool(self._rfstate & 0x10)
            attr[ATTR_RF_LOOP2] = bool(self._rfstate & 0x20)
            attr[ATTR_RF_LOOP4] = bool(self._rfstate & 0x40)
            attr[ATTR_RF_LOOP1] = bool(self._rfstate & 0x80)
        return attr

    @property
    def is_on(self):
        """Return true if sensor is on."""
        return self._state == 1

    @property
    def device_class(self):
        """Return the class of this sensor, from DEVICE_CLASSES."""
        return self._zone_type

    def _fault_callback(self, zone):
        """Update the zone's state, if needed."""
        if zone is None or int(zone) == self._zone_number:
            self._state = 1
            self.schedule_update_ha_state()

    def _restore_callback(self, zone):
        """Update the zone's state, if needed."""
        if zone is None or int(zone) == self._zone_number:
            self._state = 0
            self.schedule_update_ha_state()

    def _rfx_message_callback(self, message):
        """Update RF state."""
        if self._rfid and message and message.serial_number == self._rfid:
            self._rfstate = message.value
            if self._loop:
                self._state = 1 if message.loop[self._loop - 1] else 0
            self.schedule_update_ha_state()

    def _rel_message_callback(self, message):
        """Update relay / expander state."""

        if self._relay_addr == message.address and self._relay_chan == message.channel:
            _LOGGER.debug(
                "%s %d:%d value:%d",
                "Relay" if message.type == message.RELAY else "ZoneExpander",
                message.address,
                message.channel,
                message.value,
            )
            self._state = message.value
            self.schedule_update_ha_state()