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

from velbusaio.channels import ButtonCounter, LightSensor, SensorNumber, Temperature

from homeassistant.components.sensor import (
    STATE_CLASS_MEASUREMENT,
    STATE_CLASS_TOTAL_INCREASING,
    SensorEntity,
)
from homeassistant.config_entries import ConfigEntry
from homeassistant.const import (
    DEVICE_CLASS_ENERGY,
    DEVICE_CLASS_POWER,
    DEVICE_CLASS_TEMPERATURE,
)
from homeassistant.core import HomeAssistant
from homeassistant.helpers.entity_platform import AddEntitiesCallback

from . import VelbusEntity
from .const import DOMAIN


async def async_setup_entry(
    hass: HomeAssistant,
    entry: ConfigEntry,
    async_add_entities: AddEntitiesCallback,
) -> None:
    """Set up Velbus switch based on config_entry."""
    await hass.data[DOMAIN][entry.entry_id]["tsk"]
    cntrl = hass.data[DOMAIN][entry.entry_id]["cntrl"]
    entities = []
    for channel in cntrl.get_all("sensor"):
        entities.append(VelbusSensor(channel))
        if channel.is_counter_channel():
            entities.append(VelbusSensor(channel, True))
    async_add_entities(entities)


class VelbusSensor(VelbusEntity, SensorEntity):
    """Representation of a sensor."""

    _channel: ButtonCounter | Temperature | LightSensor | SensorNumber

    def __init__(
        self,
        channel: ButtonCounter | Temperature | LightSensor | SensorNumber,
        counter: bool = False,
    ) -> None:
        """Initialize a sensor Velbus entity."""
        super().__init__(channel)
        self._is_counter: bool = counter

    @property
    def unique_id(self) -> str:
        """Return unique ID for counter sensors."""
        unique_id = super().unique_id
        if self._is_counter:
            unique_id = f"{unique_id}-counter"
        return unique_id

    @property
    def name(self) -> str:
        """Return the name for the sensor."""
        name = super().name
        if self._is_counter:
            name = f"{name}-counter"
        return name

    @property
    def device_class(self) -> str | None:
        """Return the device class of the sensor."""
        if self._is_counter:
            return DEVICE_CLASS_ENERGY
        if self._channel.is_counter_channel():
            return DEVICE_CLASS_POWER
        if self._channel.is_temperature():
            return DEVICE_CLASS_TEMPERATURE
        return None

    @property
    def native_value(self) -> float | int | None:
        """Return the state of the sensor."""
        if self._is_counter:
            return float(self._channel.get_counter_state())
        return float(self._channel.get_state())

    @property
    def native_unit_of_measurement(self) -> str:
        """Return the unit this state is expressed in."""
        if self._is_counter:
            return str(self._channel.get_counter_unit())
        return str(self._channel.get_unit())

    @property
    def icon(self) -> str | None:
        """Icon to use in the frontend."""
        if self._is_counter:
            return "mdi:counter"
        return None

    @property
    def state_class(self) -> str:
        """Return the state class of this device."""
        if self._is_counter:
            return STATE_CLASS_TOTAL_INCREASING
        return STATE_CLASS_MEASUREMENT