"""Representation of a deCONZ remote or keypad."""

from __future__ import annotations

from typing import Any

from pydeconz.models.event import EventType
from pydeconz.models.sensor.ancillary_control import (
    AncillaryControl,
    AncillaryControlAction,
)
from pydeconz.models.sensor.switch import Switch

from homeassistant.const import (
    CONF_DEVICE_ID,
    CONF_EVENT,
    CONF_ID,
    CONF_UNIQUE_ID,
    CONF_XY,
)
from homeassistant.core import callback
from homeassistant.helpers import device_registry as dr
from homeassistant.util import slugify

from .const import CONF_ANGLE, CONF_GESTURE, LOGGER
from .deconz_device import DeconzBase
from .gateway import DeconzGateway

CONF_DECONZ_EVENT = "deconz_event"
CONF_DECONZ_ALARM_EVENT = "deconz_alarm_event"

SUPPORTED_DECONZ_ALARM_EVENTS = {
    AncillaryControlAction.EMERGENCY,
    AncillaryControlAction.FIRE,
    AncillaryControlAction.INVALID_CODE,
    AncillaryControlAction.PANIC,
}


async def async_setup_events(gateway: DeconzGateway) -> None:
    """Set up the deCONZ events."""

    @callback
    def async_add_sensor(_: EventType, sensor_id: str) -> None:
        """Create DeconzEvent."""
        new_event: DeconzAlarmEvent | DeconzEvent
        sensor = gateway.api.sensors[sensor_id]

        if isinstance(sensor, Switch):
            new_event = DeconzEvent(sensor, gateway)

        elif isinstance(sensor, AncillaryControl):
            new_event = DeconzAlarmEvent(sensor, gateway)

        gateway.hass.async_create_task(new_event.async_update_device_registry())
        gateway.events.append(new_event)

    gateway.register_platform_add_device_callback(
        async_add_sensor,
        gateway.api.sensors.switch,
    )
    gateway.register_platform_add_device_callback(
        async_add_sensor,
        gateway.api.sensors.ancillary_control,
    )


@callback
def async_unload_events(gateway: DeconzGateway) -> None:
    """Unload all deCONZ events."""
    for event in gateway.events:
        event.async_will_remove_from_hass()

    gateway.events.clear()


class DeconzEventBase(DeconzBase):
    """When you want signals instead of entities.

    Stateless sensors such as remotes are expected to generate an event
    instead of a sensor entity in hass.
    """

    def __init__(
        self,
        device: AncillaryControl | Switch,
        gateway: DeconzGateway,
    ) -> None:
        """Register callback that will be used for signals."""
        super().__init__(device, gateway)

        self._unsubscribe = device.subscribe(self.async_update_callback)

        self.device = device
        self.device_id: str | None = None
        self.event_id = slugify(self._device.name)
        LOGGER.debug("deCONZ event created: %s", self.event_id)

    @callback
    def async_will_remove_from_hass(self) -> None:
        """Disconnect event object when removed."""
        self._unsubscribe()

    @callback
    def async_update_callback(self) -> None:
        """Fire the event if reason is that state is updated."""
        raise NotImplementedError

    async def async_update_device_registry(self) -> None:
        """Update device registry."""
        if not self.device_info:
            return

        device_registry = dr.async_get(self.gateway.hass)

        entry = device_registry.async_get_or_create(
            config_entry_id=self.gateway.config_entry.entry_id, **self.device_info
        )
        self.device_id = entry.id


class DeconzEvent(DeconzEventBase):
    """When you want signals instead of entities.

    Stateless sensors such as remotes are expected to generate an event
    instead of a sensor entity in hass.
    """

    _device: Switch

    @callback
    def async_update_callback(self) -> None:
        """Fire the event if reason is that state is updated."""
        if (
            self.gateway.ignore_state_updates
            or "state" not in self._device.changed_keys
        ):
            return

        data: dict[str, Any] = {
            CONF_ID: self.event_id,
            CONF_UNIQUE_ID: self.serial,
            CONF_EVENT: self._device.button_event,
        }

        if self.device_id:
            data[CONF_DEVICE_ID] = self.device_id

        if self._device.gesture is not None:
            data[CONF_GESTURE] = self._device.gesture

        if self._device.angle is not None:
            data[CONF_ANGLE] = self._device.angle

        if self._device.xy is not None:
            data[CONF_XY] = self._device.xy

        self.gateway.hass.bus.async_fire(CONF_DECONZ_EVENT, data)


class DeconzAlarmEvent(DeconzEventBase):
    """Alarm control panel companion event when user interacts with a keypad."""

    _device: AncillaryControl

    @callback
    def async_update_callback(self) -> None:
        """Fire the event if reason is new action is updated."""
        if (
            self.gateway.ignore_state_updates
            or "action" not in self._device.changed_keys
            or self._device.action not in SUPPORTED_DECONZ_ALARM_EVENTS
        ):
            return

        data = {
            CONF_ID: self.event_id,
            CONF_UNIQUE_ID: self.serial,
            CONF_DEVICE_ID: self.device_id,
            CONF_EVENT: self._device.action.value,
        }

        self.gateway.hass.bus.async_fire(CONF_DECONZ_ALARM_EVENT, data)
