"""Support for AVM FRITZ!SmartHome temperature sensor only devices."""
from __future__ import annotations

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.config_entries import ConfigEntry
from homeassistant.const import (
    ELECTRIC_CURRENT_AMPERE,
    ELECTRIC_POTENTIAL_VOLT,
    ENERGY_KILO_WATT_HOUR,
    PERCENTAGE,
    POWER_WATT,
    TEMP_CELSIUS,
)
from homeassistant.core import HomeAssistant
from homeassistant.helpers.entity import EntityCategory
from homeassistant.helpers.entity_platform import AddEntitiesCallback
from homeassistant.helpers.typing import StateType
from homeassistant.util.dt import utc_from_timestamp

from . import FritzBoxDeviceEntity
from .const import CONF_COORDINATOR, DOMAIN as FRITZBOX_DOMAIN
from .model import FritzEntityDescriptionMixinBase


@dataclass
class FritzEntityDescriptionMixinSensor(FritzEntityDescriptionMixinBase):
    """Sensor description mixin for Fritz!Smarthome entities."""

    native_value: Callable[[FritzhomeDevice], StateType | datetime]


@dataclass
class FritzSensorEntityDescription(
    SensorEntityDescription, FritzEntityDescriptionMixinSensor
):
    """Description for Fritz!Smarthome sensor entities."""


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 device.has_temperature_sensor and not device.has_thermostat


def value_electric_current(device: FritzhomeDevice) -> float:
    """Return native value for electric current sensor."""
    if (
        isinstance(device.power, int)
        and isinstance(device.voltage, int)
        and device.voltage > 0
    ):
        return round(device.power / device.voltage, 3)
    return 0.0


def value_nextchange_preset(device: FritzhomeDevice) -> str:
    """Return native value for next scheduled preset sensor."""
    if device.nextchange_temperature == device.eco_temperature:
        return PRESET_ECO
    return PRESET_COMFORT


def value_scheduled_preset(device: FritzhomeDevice) -> str:
    """Return native value for current scheduled preset sensor."""
    if device.nextchange_temperature == device.eco_temperature:
        return PRESET_COMFORT
    return PRESET_ECO


SENSOR_TYPES: Final[tuple[FritzSensorEntityDescription, ...]] = (
    FritzSensorEntityDescription(
        key="temperature",
        name="Temperature",
        native_unit_of_measurement=TEMP_CELSIUS,
        device_class=SensorDeviceClass.TEMPERATURE,
        state_class=SensorStateClass.MEASUREMENT,
        entity_category=EntityCategory.DIAGNOSTIC,
        suitable=suitable_temperature,
        native_value=lambda device: device.temperature,  # type: ignore[no-any-return]
    ),
    FritzSensorEntityDescription(
        key="humidity",
        name="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,  # type: ignore[no-any-return]
    ),
    FritzSensorEntityDescription(
        key="battery",
        name="Battery",
        native_unit_of_measurement=PERCENTAGE,
        device_class=SensorDeviceClass.BATTERY,
        entity_category=EntityCategory.DIAGNOSTIC,
        suitable=lambda device: device.battery_level is not None,
        native_value=lambda device: device.battery_level,  # type: ignore[no-any-return]
    ),
    FritzSensorEntityDescription(
        key="power_consumption",
        name="Power Consumption",
        native_unit_of_measurement=POWER_WATT,
        device_class=SensorDeviceClass.POWER,
        state_class=SensorStateClass.MEASUREMENT,
        suitable=lambda device: device.has_powermeter,  # type: ignore[no-any-return]
        native_value=lambda device: round((device.power or 0.0) / 1000, 3),
    ),
    FritzSensorEntityDescription(
        key="voltage",
        name="Voltage",
        native_unit_of_measurement=ELECTRIC_POTENTIAL_VOLT,
        device_class=SensorDeviceClass.VOLTAGE,
        state_class=SensorStateClass.MEASUREMENT,
        suitable=lambda device: device.has_powermeter,  # type: ignore[no-any-return]
        native_value=lambda device: round((device.voltage or 0.0) / 1000, 2),
    ),
    FritzSensorEntityDescription(
        key="electric_current",
        name="Electric Current",
        native_unit_of_measurement=ELECTRIC_CURRENT_AMPERE,
        device_class=SensorDeviceClass.CURRENT,
        state_class=SensorStateClass.MEASUREMENT,
        suitable=lambda device: device.has_powermeter,  # type: ignore[no-any-return]
        native_value=value_electric_current,
    ),
    FritzSensorEntityDescription(
        key="total_energy",
        name="Total Energy",
        native_unit_of_measurement=ENERGY_KILO_WATT_HOUR,
        device_class=SensorDeviceClass.ENERGY,
        state_class=SensorStateClass.TOTAL_INCREASING,
        suitable=lambda device: device.has_powermeter,  # type: ignore[no-any-return]
        native_value=lambda device: (device.energy or 0.0) / 1000,
    ),
    # Thermostat Sensors
    FritzSensorEntityDescription(
        key="comfort_temperature",
        name="Comfort Temperature",
        native_unit_of_measurement=TEMP_CELSIUS,
        device_class=SensorDeviceClass.TEMPERATURE,
        suitable=suitable_comfort_temperature,
        native_value=lambda device: device.comfort_temperature,  # type: ignore[no-any-return]
    ),
    FritzSensorEntityDescription(
        key="eco_temperature",
        name="Eco Temperature",
        native_unit_of_measurement=TEMP_CELSIUS,
        device_class=SensorDeviceClass.TEMPERATURE,
        suitable=suitable_eco_temperature,
        native_value=lambda device: device.eco_temperature,  # type: ignore[no-any-return]
    ),
    FritzSensorEntityDescription(
        key="nextchange_temperature",
        name="Next Scheduled Temperature",
        native_unit_of_measurement=TEMP_CELSIUS,
        device_class=SensorDeviceClass.TEMPERATURE,
        suitable=suitable_nextchange_temperature,
        native_value=lambda device: device.nextchange_temperature,  # type: ignore[no-any-return]
    ),
    FritzSensorEntityDescription(
        key="nextchange_time",
        name="Next Scheduled Change Time",
        device_class=SensorDeviceClass.TIMESTAMP,
        suitable=suitable_nextchange_time,
        native_value=lambda device: utc_from_timestamp(device.nextchange_endperiod),
    ),
    FritzSensorEntityDescription(
        key="nextchange_preset",
        name="Next Scheduled Preset",
        suitable=suitable_nextchange_temperature,
        native_value=value_nextchange_preset,
    ),
    FritzSensorEntityDescription(
        key="scheduled_preset",
        name="Current Scheduled Preset",
        suitable=suitable_nextchange_temperature,
        native_value=value_scheduled_preset,
    ),
)


async def async_setup_entry(
    hass: HomeAssistant, entry: ConfigEntry, async_add_entities: AddEntitiesCallback
) -> None:
    """Set up the FRITZ!SmartHome sensor from ConfigEntry."""
    coordinator = hass.data[FRITZBOX_DOMAIN][entry.entry_id][CONF_COORDINATOR]

    async_add_entities(
        [
            FritzBoxSensor(coordinator, ain, description)
            for ain, device in coordinator.data.devices.items()
            for description in SENSOR_TYPES
            if description.suitable(device)
        ]
    )


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)