"""Support for RFXtrx sensors."""
from __future__ import annotations

from collections.abc import Callable
from dataclasses import dataclass
import logging

from RFXtrx import ControlEvent, RFXtrxEvent, SensorEvent

from homeassistant.components.sensor import (
    SensorDeviceClass,
    SensorEntity,
    SensorEntityDescription,
    SensorStateClass,
)
from homeassistant.config_entries import ConfigEntry
from homeassistant.const import (
    DEGREE,
    ELECTRIC_CURRENT_AMPERE,
    ELECTRIC_POTENTIAL_VOLT,
    ENERGY_KILO_WATT_HOUR,
    LENGTH_MILLIMETERS,
    PERCENTAGE,
    POWER_WATT,
    PRECIPITATION_MILLIMETERS_PER_HOUR,
    PRESSURE_HPA,
    SIGNAL_STRENGTH_DECIBELS_MILLIWATT,
    SPEED_METERS_PER_SECOND,
    TEMP_CELSIUS,
    UV_INDEX,
)
from homeassistant.core import HomeAssistant, callback
from homeassistant.helpers.entity import EntityCategory
from homeassistant.helpers.entity_platform import AddEntitiesCallback

from . import DeviceTuple, RfxtrxEntity, async_setup_platform_entry, get_rfx_object
from .const import ATTR_EVENT

_LOGGER = logging.getLogger(__name__)


def _battery_convert(value):
    """Battery is given as a value between 0 and 9."""
    if value is None:
        return None
    return (value + 1) * 10


def _rssi_convert(value):
    """Rssi is given as dBm value."""
    if value is None:
        return None
    return f"{value*8-120}"


@dataclass
class RfxtrxSensorEntityDescription(SensorEntityDescription):
    """Description of sensor entities."""

    convert: Callable = lambda x: x


SENSOR_TYPES = (
    RfxtrxSensorEntityDescription(
        key="Barometer",
        device_class=SensorDeviceClass.PRESSURE,
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=PRESSURE_HPA,
    ),
    RfxtrxSensorEntityDescription(
        key="Battery numeric",
        device_class=SensorDeviceClass.BATTERY,
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=PERCENTAGE,
        convert=_battery_convert,
        entity_category=EntityCategory.DIAGNOSTIC,
    ),
    RfxtrxSensorEntityDescription(
        key="Current",
        device_class=SensorDeviceClass.CURRENT,
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=ELECTRIC_CURRENT_AMPERE,
    ),
    RfxtrxSensorEntityDescription(
        key="Current Ch. 1",
        device_class=SensorDeviceClass.CURRENT,
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=ELECTRIC_CURRENT_AMPERE,
    ),
    RfxtrxSensorEntityDescription(
        key="Current Ch. 2",
        device_class=SensorDeviceClass.CURRENT,
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=ELECTRIC_CURRENT_AMPERE,
    ),
    RfxtrxSensorEntityDescription(
        key="Current Ch. 3",
        device_class=SensorDeviceClass.CURRENT,
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=ELECTRIC_CURRENT_AMPERE,
    ),
    RfxtrxSensorEntityDescription(
        key="Energy usage",
        device_class=SensorDeviceClass.POWER,
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=POWER_WATT,
    ),
    RfxtrxSensorEntityDescription(
        key="Humidity",
        device_class=SensorDeviceClass.HUMIDITY,
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=PERCENTAGE,
    ),
    RfxtrxSensorEntityDescription(
        key="Rssi numeric",
        device_class=SensorDeviceClass.SIGNAL_STRENGTH,
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=SIGNAL_STRENGTH_DECIBELS_MILLIWATT,
        convert=_rssi_convert,
        entity_category=EntityCategory.DIAGNOSTIC,
    ),
    RfxtrxSensorEntityDescription(
        key="Temperature",
        device_class=SensorDeviceClass.TEMPERATURE,
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=TEMP_CELSIUS,
    ),
    RfxtrxSensorEntityDescription(
        key="Temperature2",
        device_class=SensorDeviceClass.TEMPERATURE,
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=TEMP_CELSIUS,
    ),
    RfxtrxSensorEntityDescription(
        key="Total usage",
        device_class=SensorDeviceClass.ENERGY,
        state_class=SensorStateClass.TOTAL_INCREASING,
        native_unit_of_measurement=ENERGY_KILO_WATT_HOUR,
    ),
    RfxtrxSensorEntityDescription(
        key="Voltage",
        device_class=SensorDeviceClass.VOLTAGE,
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=ELECTRIC_POTENTIAL_VOLT,
    ),
    RfxtrxSensorEntityDescription(
        key="Wind direction",
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=DEGREE,
    ),
    RfxtrxSensorEntityDescription(
        key="Rain rate",
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=PRECIPITATION_MILLIMETERS_PER_HOUR,
    ),
    RfxtrxSensorEntityDescription(
        key="Sound",
    ),
    RfxtrxSensorEntityDescription(
        key="Sensor Status",
    ),
    RfxtrxSensorEntityDescription(
        key="Count",
        state_class=SensorStateClass.TOTAL_INCREASING,
        native_unit_of_measurement="count",
    ),
    RfxtrxSensorEntityDescription(
        key="Counter value",
        state_class=SensorStateClass.TOTAL_INCREASING,
        native_unit_of_measurement="count",
    ),
    RfxtrxSensorEntityDescription(
        key="Chill",
        device_class=SensorDeviceClass.TEMPERATURE,
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=TEMP_CELSIUS,
    ),
    RfxtrxSensorEntityDescription(
        key="Wind average speed",
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=SPEED_METERS_PER_SECOND,
    ),
    RfxtrxSensorEntityDescription(
        key="Wind gust",
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=SPEED_METERS_PER_SECOND,
    ),
    RfxtrxSensorEntityDescription(
        key="Rain total",
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=LENGTH_MILLIMETERS,
    ),
    RfxtrxSensorEntityDescription(
        key="Forecast",
    ),
    RfxtrxSensorEntityDescription(
        key="Forecast numeric",
    ),
    RfxtrxSensorEntityDescription(
        key="Humidity status",
    ),
    RfxtrxSensorEntityDescription(
        key="UV",
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=UV_INDEX,
    ),
)

SENSOR_TYPES_DICT = {desc.key: desc for desc in SENSOR_TYPES}


async def async_setup_entry(
    hass: HomeAssistant,
    config_entry: ConfigEntry,
    async_add_entities: AddEntitiesCallback,
) -> None:
    """Set up config entry."""

    def _supported(event):
        return isinstance(event, (ControlEvent, SensorEvent))

    def _constructor(
        event: RFXtrxEvent,
        auto: RFXtrxEvent | None,
        device_id: DeviceTuple,
        entity_info: dict,
    ):
        entities: list[RfxtrxSensor] = []
        for data_type in set(event.values) & set(SENSOR_TYPES_DICT):
            entities.append(
                RfxtrxSensor(
                    event.device,
                    device_id,
                    SENSOR_TYPES_DICT[data_type],
                    event=event if auto else None,
                )
            )

        return entities

    await async_setup_platform_entry(
        hass, config_entry, async_add_entities, _supported, _constructor
    )


class RfxtrxSensor(RfxtrxEntity, SensorEntity):
    """Representation of a RFXtrx sensor."""

    entity_description: RfxtrxSensorEntityDescription

    def __init__(self, device, device_id, entity_description, event=None):
        """Initialize the sensor."""
        super().__init__(device, device_id, event=event)
        self.entity_description = entity_description
        self._name = f"{device.type_string} {device.id_string} {entity_description.key}"
        self._unique_id = "_".join(
            x for x in (*self._device_id, entity_description.key)
        )

    async def async_added_to_hass(self):
        """Restore device state."""
        await super().async_added_to_hass()

        if (
            self._event is None
            and (old_state := await self.async_get_last_state()) is not None
            and (event := old_state.attributes.get(ATTR_EVENT))
        ):
            self._apply_event(get_rfx_object(event))

    @property
    def native_value(self):
        """Return the state of the sensor."""
        if not self._event:
            return None
        value = self._event.values.get(self.entity_description.key)
        return self.entity_description.convert(value)

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

    @property
    def force_update(self) -> bool:
        """We should force updates. Repeated states have meaning."""
        return True

    @callback
    def _handle_event(self, event, device_id):
        """Check if event applies to me and update."""
        if device_id != self._device_id:
            return

        if self.entity_description.key not in event.values:
            return

        _LOGGER.debug(
            "Sensor update (Device ID: %s Class: %s Sub: %s)",
            event.device.id_string,
            event.device.__class__.__name__,
            event.device.subtype,
        )

        self._apply_event(event)

        self.async_write_ha_state()