"""Support for AVM FRITZ!SmartHome temperature sensor only devices."""

from collections.abc import Callable
from dataclasses import dataclass
from datetime import datetime
from typing import Final

from pyfritzhome.fritzhomedevice import FritzhomeDevice

from homeassistant.components.climate import PRESET_COMFORT, PRESET_ECO
from homeassistant.components.sensor import (
    SensorDeviceClass,
    SensorEntity,
    SensorEntityDescription,
    SensorStateClass,
)
from homeassistant.const import (
    PERCENTAGE,
    EntityCategory,
    UnitOfElectricCurrent,
    UnitOfElectricPotential,
    UnitOfEnergy,
    UnitOfPower,
    UnitOfTemperature,
)
from homeassistant.core import HomeAssistant, callback
from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
from homeassistant.helpers.typing import StateType
from homeassistant.util.dt import utc_from_timestamp

from .coordinator import FritzboxConfigEntry
from .entity import FritzBoxDeviceEntity
from .model import FritzEntityDescriptionMixinBase

# Coordinator handles data updates, so we can allow unlimited parallel updates
PARALLEL_UPDATES = 0


@dataclass(frozen=True, kw_only=True)
class FritzSensorEntityDescription(
    SensorEntityDescription, FritzEntityDescriptionMixinBase
):
    """Description for Fritz!Smarthome sensor entities."""

    entity_category_fn: Callable[[FritzhomeDevice], EntityCategory | None] | None = None
    native_value: Callable[[FritzhomeDevice], StateType | datetime]


def suitable_eco_temperature(device: FritzhomeDevice) -> bool:
    """Check suitablity for eco temperature sensor."""
    return device.has_thermostat and device.eco_temperature is not None


def suitable_comfort_temperature(device: FritzhomeDevice) -> bool:
    """Check suitablity for comfort temperature sensor."""
    return device.has_thermostat and device.comfort_temperature is not None


def suitable_nextchange_temperature(device: FritzhomeDevice) -> bool:
    """Check suitablity for next scheduled temperature sensor."""
    return device.has_thermostat and device.nextchange_temperature is not None


def suitable_nextchange_time(device: FritzhomeDevice) -> bool:
    """Check suitablity for next scheduled changed time sensor."""
    return device.has_thermostat and device.nextchange_endperiod is not None


def suitable_temperature(device: FritzhomeDevice) -> bool:
    """Check suitablity for temperature sensor."""
    return bool(device.has_temperature_sensor)


def entity_category_temperature(device: FritzhomeDevice) -> EntityCategory | None:
    """Determine proper entity category for temperature sensor."""
    if device.has_switch or device.has_lightbulb:
        return EntityCategory.DIAGNOSTIC
    return None


def value_nextchange_preset(device: FritzhomeDevice) -> str | None:
    """Return native value for next scheduled preset sensor."""
    if not device.nextchange_endperiod:
        return None
    if device.nextchange_temperature == device.eco_temperature:
        return PRESET_ECO
    return PRESET_COMFORT


def value_scheduled_preset(device: FritzhomeDevice) -> str | None:
    """Return native value for current scheduled preset sensor."""
    if not device.nextchange_endperiod:
        return None
    if device.nextchange_temperature == device.eco_temperature:
        return PRESET_COMFORT
    return PRESET_ECO


def value_nextchange_temperature(device: FritzhomeDevice) -> float | None:
    """Return native value for next scheduled temperature time sensor."""
    if device.nextchange_endperiod and isinstance(device.nextchange_temperature, float):
        return device.nextchange_temperature
    return None


def value_nextchange_time(device: FritzhomeDevice) -> datetime | None:
    """Return native value for next scheduled changed time sensor."""
    if device.nextchange_endperiod:
        return utc_from_timestamp(device.nextchange_endperiod)
    return None


SENSOR_TYPES: Final[tuple[FritzSensorEntityDescription, ...]] = (
    FritzSensorEntityDescription(
        key="temperature",
        native_unit_of_measurement=UnitOfTemperature.CELSIUS,
        device_class=SensorDeviceClass.TEMPERATURE,
        state_class=SensorStateClass.MEASUREMENT,
        entity_category_fn=entity_category_temperature,
        suitable=suitable_temperature,
        native_value=lambda device: device.temperature,
    ),
    FritzSensorEntityDescription(
        key="humidity",
        native_unit_of_measurement=PERCENTAGE,
        device_class=SensorDeviceClass.HUMIDITY,
        state_class=SensorStateClass.MEASUREMENT,
        suitable=lambda device: device.rel_humidity is not None,
        native_value=lambda device: device.rel_humidity,
    ),
    FritzSensorEntityDescription(
        key="battery",
        native_unit_of_measurement=PERCENTAGE,
        device_class=SensorDeviceClass.BATTERY,
        state_class=SensorStateClass.MEASUREMENT,
        entity_category=EntityCategory.DIAGNOSTIC,
        suitable=lambda device: device.battery_level is not None,
        native_value=lambda device: device.battery_level,
    ),
    FritzSensorEntityDescription(
        key="power_consumption",
        native_unit_of_measurement=UnitOfPower.WATT,
        device_class=SensorDeviceClass.POWER,
        state_class=SensorStateClass.MEASUREMENT,
        suitable=lambda device: device.has_powermeter,
        native_value=lambda device: round((device.power or 0.0) / 1000, 3),
    ),
    FritzSensorEntityDescription(
        key="voltage",
        native_unit_of_measurement=UnitOfElectricPotential.VOLT,
        device_class=SensorDeviceClass.VOLTAGE,
        state_class=SensorStateClass.MEASUREMENT,
        suitable=lambda device: device.has_powermeter,
        native_value=lambda device: round((device.voltage or 0.0) / 1000, 2),
    ),
    FritzSensorEntityDescription(
        key="electric_current",
        native_unit_of_measurement=UnitOfElectricCurrent.AMPERE,
        device_class=SensorDeviceClass.CURRENT,
        state_class=SensorStateClass.MEASUREMENT,
        suitable=lambda device: device.has_powermeter,
        native_value=lambda device: round((device.current or 0.0) / 1000, 3),
    ),
    FritzSensorEntityDescription(
        key="total_energy",
        native_unit_of_measurement=UnitOfEnergy.KILO_WATT_HOUR,
        device_class=SensorDeviceClass.ENERGY,
        state_class=SensorStateClass.TOTAL_INCREASING,
        suitable=lambda device: device.has_powermeter,
        native_value=lambda device: (device.energy or 0.0) / 1000,
    ),
    # Thermostat Sensors
    FritzSensorEntityDescription(
        key="comfort_temperature",
        translation_key="comfort_temperature",
        native_unit_of_measurement=UnitOfTemperature.CELSIUS,
        device_class=SensorDeviceClass.TEMPERATURE,
        entity_category=EntityCategory.DIAGNOSTIC,
        suitable=suitable_comfort_temperature,
        native_value=lambda device: device.comfort_temperature,
    ),
    FritzSensorEntityDescription(
        key="eco_temperature",
        translation_key="eco_temperature",
        native_unit_of_measurement=UnitOfTemperature.CELSIUS,
        device_class=SensorDeviceClass.TEMPERATURE,
        entity_category=EntityCategory.DIAGNOSTIC,
        suitable=suitable_eco_temperature,
        native_value=lambda device: device.eco_temperature,
    ),
    FritzSensorEntityDescription(
        key="nextchange_temperature",
        translation_key="nextchange_temperature",
        native_unit_of_measurement=UnitOfTemperature.CELSIUS,
        device_class=SensorDeviceClass.TEMPERATURE,
        entity_category=EntityCategory.DIAGNOSTIC,
        suitable=suitable_nextchange_temperature,
        native_value=value_nextchange_temperature,
    ),
    FritzSensorEntityDescription(
        key="nextchange_time",
        translation_key="nextchange_time",
        device_class=SensorDeviceClass.TIMESTAMP,
        entity_category=EntityCategory.DIAGNOSTIC,
        suitable=suitable_nextchange_time,
        native_value=value_nextchange_time,
    ),
    FritzSensorEntityDescription(
        key="nextchange_preset",
        translation_key="nextchange_preset",
        entity_category=EntityCategory.DIAGNOSTIC,
        suitable=suitable_nextchange_temperature,
        native_value=value_nextchange_preset,
    ),
    FritzSensorEntityDescription(
        key="scheduled_preset",
        translation_key="scheduled_preset",
        entity_category=EntityCategory.DIAGNOSTIC,
        suitable=suitable_nextchange_temperature,
        native_value=value_scheduled_preset,
    ),
)


async def async_setup_entry(
    hass: HomeAssistant,
    entry: FritzboxConfigEntry,
    async_add_entities: AddConfigEntryEntitiesCallback,
) -> None:
    """Set up the FRITZ!SmartHome sensor from ConfigEntry."""
    coordinator = entry.runtime_data

    @callback
    def _add_entities(devices: set[str] | None = None) -> None:
        """Add devices."""
        if devices is None:
            devices = coordinator.new_devices
        if not devices:
            return
        async_add_entities(
            FritzBoxSensor(coordinator, ain, description)
            for ain in devices
            for description in SENSOR_TYPES
            if description.suitable(coordinator.data.devices[ain])
        )

    entry.async_on_unload(coordinator.async_add_listener(_add_entities))

    _add_entities(set(coordinator.data.devices))


class FritzBoxSensor(FritzBoxDeviceEntity, SensorEntity):
    """The entity class for FRITZ!SmartHome sensors."""

    entity_description: FritzSensorEntityDescription

    @property
    def native_value(self) -> StateType | datetime:
        """Return the state of the sensor."""
        return self.entity_description.native_value(self.data)

    @property
    def entity_category(self) -> EntityCategory | None:
        """Return the category of the entity, if any."""
        if self.entity_description.entity_category_fn is not None:
            return self.entity_description.entity_category_fn(self.data)
        return super().entity_category