"""Support for sensors."""

from __future__ import annotations

from typing import Final, cast

from aiocomelit.api import ComelitSerialBridgeObject, ComelitVedoZoneObject
from aiocomelit.const import BRIDGE, OTHER, AlarmZoneState

from homeassistant.components.sensor import (
    SensorDeviceClass,
    SensorEntity,
    SensorEntityDescription,
)
from homeassistant.const import CONF_TYPE, UnitOfPower
from homeassistant.core import HomeAssistant
from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
from homeassistant.helpers.typing import StateType
from homeassistant.helpers.update_coordinator import CoordinatorEntity

from .coordinator import ComelitConfigEntry, ComelitSerialBridge, ComelitVedoSystem
from .entity import ComelitBridgeBaseEntity

# Coordinator is used to centralize the data updates
PARALLEL_UPDATES = 0

SENSOR_BRIDGE_TYPES: Final = (
    SensorEntityDescription(
        key="power",
        native_unit_of_measurement=UnitOfPower.WATT,
        device_class=SensorDeviceClass.POWER,
    ),
)

SENSOR_VEDO_TYPES: Final = (
    SensorEntityDescription(
        key="human_status",
        translation_key="zone_status",
        name=None,
        device_class=SensorDeviceClass.ENUM,
        options=[zone_state.value for zone_state in AlarmZoneState],
    ),
)


async def async_setup_entry(
    hass: HomeAssistant,
    config_entry: ComelitConfigEntry,
    async_add_entities: AddConfigEntryEntitiesCallback,
) -> None:
    """Set up Comelit sensors."""

    if config_entry.data.get(CONF_TYPE, BRIDGE) == BRIDGE:
        await async_setup_bridge_entry(hass, config_entry, async_add_entities)
    else:
        await async_setup_vedo_entry(hass, config_entry, async_add_entities)


async def async_setup_bridge_entry(
    hass: HomeAssistant,
    config_entry: ComelitConfigEntry,
    async_add_entities: AddConfigEntryEntitiesCallback,
) -> None:
    """Set up Comelit Bridge sensors."""

    coordinator = cast(ComelitSerialBridge, config_entry.runtime_data)

    known_devices: set[int] = set()

    def _check_device() -> None:
        current_devices = set(coordinator.data[OTHER])
        new_devices = current_devices - known_devices
        if new_devices:
            known_devices.update(new_devices)
            async_add_entities(
                ComelitBridgeSensorEntity(
                    coordinator, device, config_entry.entry_id, sensor_desc
                )
                for sensor_desc in SENSOR_BRIDGE_TYPES
                for device in coordinator.data[OTHER].values()
                if device.index in new_devices
            )

    _check_device()
    config_entry.async_on_unload(coordinator.async_add_listener(_check_device))


async def async_setup_vedo_entry(
    hass: HomeAssistant,
    config_entry: ComelitConfigEntry,
    async_add_entities: AddConfigEntryEntitiesCallback,
) -> None:
    """Set up Comelit VEDO sensors."""

    coordinator = cast(ComelitVedoSystem, config_entry.runtime_data)

    known_devices: set[int] = set()

    def _check_device() -> None:
        current_devices = set(coordinator.data["alarm_zones"])
        new_devices = current_devices - known_devices
        if new_devices:
            known_devices.update(new_devices)
            async_add_entities(
                ComelitVedoSensorEntity(
                    coordinator, device, config_entry.entry_id, sensor_desc
                )
                for sensor_desc in SENSOR_VEDO_TYPES
                for device in coordinator.data["alarm_zones"].values()
                if device.index in new_devices
            )

    _check_device()
    config_entry.async_on_unload(coordinator.async_add_listener(_check_device))


class ComelitBridgeSensorEntity(ComelitBridgeBaseEntity, SensorEntity):
    """Sensor device."""

    _attr_name = None

    def __init__(
        self,
        coordinator: ComelitSerialBridge,
        device: ComelitSerialBridgeObject,
        config_entry_entry_id: str,
        description: SensorEntityDescription,
    ) -> None:
        """Init sensor entity."""
        super().__init__(coordinator, device, config_entry_entry_id)

        self.entity_description = description

    @property
    def native_value(self) -> StateType:
        """Sensor value."""
        return cast(
            StateType,
            getattr(
                self.coordinator.data[OTHER][self._device.index],
                self.entity_description.key,
            ),
        )


class ComelitVedoSensorEntity(CoordinatorEntity[ComelitVedoSystem], SensorEntity):
    """Sensor device."""

    _attr_has_entity_name = True

    def __init__(
        self,
        coordinator: ComelitVedoSystem,
        zone: ComelitVedoZoneObject,
        config_entry_entry_id: str,
        description: SensorEntityDescription,
    ) -> None:
        """Init sensor entity."""
        self._zone_index = zone.index
        super().__init__(coordinator)
        # Use config_entry.entry_id as base for unique_id
        # because no serial number or mac is available
        self._attr_unique_id = f"{config_entry_entry_id}-{zone.index}"
        self._attr_device_info = coordinator.platform_device_info(zone, "zone")

        self.entity_description = description

    @property
    def _zone_object(self) -> ComelitVedoZoneObject:
        """Zone object."""
        return self.coordinator.data["alarm_zones"][self._zone_index]

    @property
    def available(self) -> bool:
        """Sensor availability."""
        return self._zone_object.human_status != AlarmZoneState.UNAVAILABLE

    @property
    def native_value(self) -> StateType:
        """Sensor value."""
        if (status := self._zone_object.human_status) == AlarmZoneState.UNKNOWN:
            return None

        return cast(str, status.value)