"""Support for KNX/IP sensors."""
from __future__ import annotations

from typing import Any

from xknx import XKNX
from xknx.devices import Sensor as XknxSensor

from homeassistant.components.sensor import (
    CONF_STATE_CLASS,
    DEVICE_CLASSES,
    SensorEntity,
)
from homeassistant.const import CONF_NAME, CONF_TYPE
from homeassistant.core import HomeAssistant
from homeassistant.helpers.entity_platform import AddEntitiesCallback
from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType, StateType
from homeassistant.util import dt

from .const import ATTR_LAST_KNX_UPDATE, ATTR_SOURCE, DOMAIN
from .knx_entity import KnxEntity
from .schema import SensorSchema


async def async_setup_platform(
    hass: HomeAssistant,
    config: ConfigType,
    async_add_entities: AddEntitiesCallback,
    discovery_info: DiscoveryInfoType | None = None,
) -> None:
    """Set up sensor(s) for KNX platform."""
    if not discovery_info or not discovery_info["platform_config"]:
        return
    platform_config = discovery_info["platform_config"]
    xknx: XKNX = hass.data[DOMAIN].xknx

    async_add_entities(
        KNXSensor(xknx, entity_config) for entity_config in platform_config
    )


def _create_sensor(xknx: XKNX, config: ConfigType) -> XknxSensor:
    """Return a KNX sensor to be used within XKNX."""
    return XknxSensor(
        xknx,
        name=config[CONF_NAME],
        group_address_state=config[SensorSchema.CONF_STATE_ADDRESS],
        sync_state=config[SensorSchema.CONF_SYNC_STATE],
        always_callback=config[SensorSchema.CONF_ALWAYS_CALLBACK],
        value_type=config[CONF_TYPE],
    )


class KNXSensor(KnxEntity, SensorEntity):
    """Representation of a KNX sensor."""

    _device: XknxSensor

    def __init__(self, xknx: XKNX, config: ConfigType) -> None:
        """Initialize of a KNX sensor."""
        super().__init__(_create_sensor(xknx, config))
        self._attr_device_class = (
            self._device.ha_device_class()
            if self._device.ha_device_class() in DEVICE_CLASSES
            else None
        )
        self._attr_force_update = self._device.always_callback
        self._attr_unique_id = str(self._device.sensor_value.group_address_state)
        self._attr_native_unit_of_measurement = self._device.unit_of_measurement()
        self._attr_state_class = config.get(CONF_STATE_CLASS)

    @property
    def native_value(self) -> StateType:
        """Return the state of the sensor."""
        return self._device.resolve_state()

    @property
    def extra_state_attributes(self) -> dict[str, Any] | None:
        """Return device specific state attributes."""
        attr: dict[str, Any] = {}

        if self._device.last_telegram is not None:
            attr[ATTR_SOURCE] = str(self._device.last_telegram.source_address)
            attr[ATTR_LAST_KNX_UPDATE] = str(
                dt.as_utc(self._device.last_telegram.timestamp)
            )
        return attr
