"""Generic device for the HomematicIP Cloud component."""
import logging
from typing import Optional

from homematicip.aio.device import AsyncDevice
from homematicip.aio.group import AsyncGroup

from homeassistant.core import callback
from homeassistant.helpers import device_registry as dr, entity_registry as er
from homeassistant.helpers.entity import Entity

from .const import DOMAIN as HMIPC_DOMAIN
from .hap import HomematicipHAP

_LOGGER = logging.getLogger(__name__)

ATTR_MODEL_TYPE = "model_type"
ATTR_LOW_BATTERY = "low_battery"
ATTR_CONFIG_PENDING = "config_pending"
ATTR_DUTY_CYCLE_REACHED = "duty_cycle_reached"
ATTR_ID = "id"
ATTR_IS_GROUP = "is_group"
# RSSI HAP -> Device
ATTR_RSSI_DEVICE = "rssi_device"
# RSSI Device -> HAP
ATTR_RSSI_PEER = "rssi_peer"
ATTR_SABOTAGE = "sabotage"
ATTR_GROUP_MEMBER_UNREACHABLE = "group_member_unreachable"
ATTR_DEVICE_OVERHEATED = "device_overheated"
ATTR_DEVICE_OVERLOADED = "device_overloaded"
ATTR_DEVICE_UNTERVOLTAGE = "device_undervoltage"
ATTR_EVENT_DELAY = "event_delay"

DEVICE_ATTRIBUTE_ICONS = {
    "lowBat": "mdi:battery-outline",
    "sabotage": "mdi:shield-alert",
    "dutyCycle": "mdi:alert",
    "deviceOverheated": "mdi:alert",
    "deviceOverloaded": "mdi:alert",
    "deviceUndervoltage": "mdi:alert",
    "configPending": "mdi:alert-circle",
}

DEVICE_ATTRIBUTES = {
    "modelType": ATTR_MODEL_TYPE,
    "sabotage": ATTR_SABOTAGE,
    "dutyCycle": ATTR_DUTY_CYCLE_REACHED,
    "rssiDeviceValue": ATTR_RSSI_DEVICE,
    "rssiPeerValue": ATTR_RSSI_PEER,
    "deviceOverheated": ATTR_DEVICE_OVERHEATED,
    "deviceOverloaded": ATTR_DEVICE_OVERLOADED,
    "deviceUndervoltage": ATTR_DEVICE_UNTERVOLTAGE,
    "configPending": ATTR_CONFIG_PENDING,
    "eventDelay": ATTR_EVENT_DELAY,
    "id": ATTR_ID,
}

GROUP_ATTRIBUTES = {
    "modelType": ATTR_MODEL_TYPE,
    "lowBat": ATTR_LOW_BATTERY,
    "sabotage": ATTR_SABOTAGE,
    "dutyCycle": ATTR_DUTY_CYCLE_REACHED,
    "configPending": ATTR_CONFIG_PENDING,
    "unreach": ATTR_GROUP_MEMBER_UNREACHABLE,
}


class HomematicipGenericDevice(Entity):
    """Representation of an HomematicIP generic device."""

    def __init__(self, hap: HomematicipHAP, device, post: Optional[str] = None) -> None:
        """Initialize the generic device."""
        self._hap = hap
        self._home = hap.home
        self._device = device
        self.post = post
        # Marker showing that the HmIP device hase been removed.
        self.hmip_device_removed = False
        _LOGGER.info("Setting up %s (%s)", self.name, self._device.modelType)

    @property
    def device_info(self):
        """Return device specific attributes."""
        # Only physical devices should be HA devices.
        if isinstance(self._device, AsyncDevice):
            return {
                "identifiers": {
                    # Serial numbers of Homematic IP device
                    (HMIPC_DOMAIN, self._device.id)
                },
                "name": self._device.label,
                "manufacturer": self._device.oem,
                "model": self._device.modelType,
                "sw_version": self._device.firmwareVersion,
                "via_device": (HMIPC_DOMAIN, self._device.homeId),
            }
        return None

    async def async_added_to_hass(self):
        """Register callbacks."""
        self._hap.hmip_device_by_entity_id[self.entity_id] = self._device
        self._device.on_update(self._async_device_changed)
        self._device.on_remove(self._async_device_removed)

    @callback
    def _async_device_changed(self, *args, **kwargs):
        """Handle device state changes."""
        # Don't update disabled entities
        if self.enabled:
            _LOGGER.debug("Event %s (%s)", self.name, self._device.modelType)
            self.async_schedule_update_ha_state()
        else:
            _LOGGER.debug(
                "Device Changed Event for %s (%s) not fired. Entity is disabled.",
                self.name,
                self._device.modelType,
            )

    async def async_will_remove_from_hass(self) -> None:
        """Run when entity will be removed from hass."""

        # Only go further if the device/entity should be removed from registries
        # due to a removal of the HmIP device.
        if self.hmip_device_removed:
            del self._hap.hmip_device_by_entity_id[self.entity_id]
            await self.async_remove_from_registries()

    async def async_remove_from_registries(self) -> None:
        """Remove entity/device from registry."""

        # Remove callback from device.
        self._device.remove_callback(self._async_device_changed)
        self._device.remove_callback(self._async_device_removed)

        if not self.registry_entry:
            return

        device_id = self.registry_entry.device_id
        if device_id:
            # Remove from device registry.
            device_registry = await dr.async_get_registry(self.hass)
            if device_id in device_registry.devices:
                # This will also remove associated entities from entity registry.
                device_registry.async_remove_device(device_id)
        else:
            # Remove from entity registry.
            # Only relevant for entities that do not belong to a device.
            entity_id = self.registry_entry.entity_id
            if entity_id:
                entity_registry = await er.async_get_registry(self.hass)
                if entity_id in entity_registry.entities:
                    entity_registry.async_remove(entity_id)

    @callback
    def _async_device_removed(self, *args, **kwargs):
        """Handle hmip device removal."""
        # Set marker showing that the HmIP device hase been removed.
        self.hmip_device_removed = True
        self.hass.async_create_task(self.async_remove())

    @property
    def name(self) -> str:
        """Return the name of the generic device."""
        name = self._device.label
        if self._home.name is not None and self._home.name != "":
            name = f"{self._home.name} {name}"
        if self.post is not None and self.post != "":
            name = f"{name} {self.post}"
        return name

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

    @property
    def available(self) -> bool:
        """Device available."""
        return not self._device.unreach

    @property
    def unique_id(self) -> str:
        """Return a unique ID."""
        return f"{self.__class__.__name__}_{self._device.id}"

    @property
    def icon(self) -> Optional[str]:
        """Return the icon."""
        for attr, icon in DEVICE_ATTRIBUTE_ICONS.items():
            if getattr(self._device, attr, None):
                return icon

        return None

    @property
    def device_state_attributes(self):
        """Return the state attributes of the generic device."""
        state_attr = {}

        if isinstance(self._device, AsyncDevice):
            for attr, attr_key in DEVICE_ATTRIBUTES.items():
                attr_value = getattr(self._device, attr, None)
                if attr_value:
                    state_attr[attr_key] = attr_value

            state_attr[ATTR_IS_GROUP] = False

        if isinstance(self._device, AsyncGroup):
            for attr, attr_key in GROUP_ATTRIBUTES.items():
                attr_value = getattr(self._device, attr, None)
                if attr_value:
                    state_attr[attr_key] = attr_value

            state_attr[ATTR_IS_GROUP] = True

        return state_attr