"""Integration with the Rachio Iro sprinkler system controller."""
from abc import abstractmethod
import logging

from homeassistant.components.binary_sensor import BinarySensorDevice
from homeassistant.helpers.dispatcher import dispatcher_connect

from . import (
    DOMAIN as DOMAIN_RACHIO,
    KEY_DEVICE_ID,
    KEY_STATUS,
    KEY_SUBTYPE,
    SIGNAL_RACHIO_CONTROLLER_UPDATE,
    STATUS_OFFLINE,
    STATUS_ONLINE,
    SUBTYPE_OFFLINE,
    SUBTYPE_ONLINE,
)

_LOGGER = logging.getLogger(__name__)


def setup_platform(hass, config, add_entities, discovery_info=None):
    """Set up the Rachio binary sensors."""
    devices = []
    for controller in hass.data[DOMAIN_RACHIO].controllers:
        devices.append(RachioControllerOnlineBinarySensor(hass, controller))

    add_entities(devices)
    _LOGGER.info("%d Rachio binary sensor(s) added", len(devices))


class RachioControllerBinarySensor(BinarySensorDevice):
    """Represent a binary sensor that reflects a Rachio state."""

    def __init__(self, hass, controller, poll=True):
        """Set up a new Rachio controller binary sensor."""
        self._controller = controller

        if poll:
            self._state = self._poll_update()
        else:
            self._state = None

        dispatcher_connect(
            hass, SIGNAL_RACHIO_CONTROLLER_UPDATE, self._handle_any_update
        )

    @property
    def should_poll(self) -> bool:
        """Declare that this entity pushes its state to HA."""
        return False

    @property
    def is_on(self) -> bool:
        """Return whether the sensor has a 'true' value."""
        return self._state

    def _handle_any_update(self, *args, **kwargs) -> None:
        """Determine whether an update event applies to this device."""
        if args[0][KEY_DEVICE_ID] != self._controller.controller_id:
            # For another device
            return

        # For this device
        self._handle_update()

    @abstractmethod
    def _poll_update(self, data=None) -> bool:
        """Request the state from the API."""
        pass

    @abstractmethod
    def _handle_update(self, *args, **kwargs) -> None:
        """Handle an update to the state of this sensor."""
        pass


class RachioControllerOnlineBinarySensor(RachioControllerBinarySensor):
    """Represent a binary sensor that reflects if the controller is online."""

    def __init__(self, hass, controller):
        """Set up a new Rachio controller online binary sensor."""
        super().__init__(hass, controller, poll=False)
        self._state = self._poll_update(controller.init_data)

    @property
    def name(self) -> str:
        """Return the name of this sensor including the controller name."""
        return f"{self._controller.name} online"

    @property
    def unique_id(self) -> str:
        """Return a unique id for this entity."""
        return f"{self._controller.controller_id}-online"

    @property
    def device_class(self) -> str:
        """Return the class of this device, from component DEVICE_CLASSES."""
        return "connectivity"

    @property
    def icon(self) -> str:
        """Return the name of an icon for this sensor."""
        return "mdi:wifi-strength-4" if self.is_on else "mdi:wifi-strength-off-outline"

    def _poll_update(self, data=None) -> bool:
        """Request the state from the API."""
        if data is None:
            data = self._controller.rachio.device.get(self._controller.controller_id)[1]

        if data[KEY_STATUS] == STATUS_ONLINE:
            return True
        if data[KEY_STATUS] == STATUS_OFFLINE:
            return False
        _LOGGER.warning(
            '"%s" reported in unknown state "%s"', self.name, data[KEY_STATUS]
        )

    def _handle_update(self, *args, **kwargs) -> None:
        """Handle an update to the state of this sensor."""
        if args[0][KEY_SUBTYPE] == SUBTYPE_ONLINE:
            self._state = True
        elif args[0][KEY_SUBTYPE] == SUBTYPE_OFFLINE:
            self._state = False

        self.schedule_update_ha_state()
