"""Diagnosewerte eines ninstrip."""

from __future__ import annotations

from collections.abc import Callable
from dataclasses import dataclass
from typing import Any

from homeassistant.components.sensor import (
    SensorDeviceClass,
    SensorEntity,
    SensorEntityDescription,
    SensorStateClass,
)
from homeassistant.const import (
    SIGNAL_STRENGTH_DECIBELS_MILLIWATT,
    EntityCategory,
    UnitOfInformation,
    UnitOfTime,
)
from homeassistant.core import HomeAssistant
from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback

from .coordinator import NinstripConfigEntry, NinstripCoordinator, NinstripData
from .entity import NinstripEntity


@dataclass(frozen=True, kw_only=True)
class NinstripSensorDescription(SensorEntityDescription):
    """Beschreibung samt Zugriff auf den Wert."""

    value: Callable[[NinstripData], Any]


def _wifi(data: NinstripData, key: str) -> Any:
    wifi = data.info.get("wifi")
    return wifi.get(key) if isinstance(wifi, dict) else None


def _strip(data: NinstripData, key: str) -> Any:
    strip = data.info.get("strip")
    return strip.get(key) if isinstance(strip, dict) else None


SENSORS: tuple[NinstripSensorDescription, ...] = (
    NinstripSensorDescription(
        key="rssi",
        translation_key="rssi",
        device_class=SensorDeviceClass.SIGNAL_STRENGTH,
        native_unit_of_measurement=SIGNAL_STRENGTH_DECIBELS_MILLIWATT,
        state_class=SensorStateClass.MEASUREMENT,
        entity_category=EntityCategory.DIAGNOSTIC,
        entity_registry_enabled_default=False,
        value=lambda d: _wifi(d, "rssi"),
    ),
    NinstripSensorDescription(
        key="uptime",
        translation_key="uptime",
        native_unit_of_measurement=UnitOfTime.SECONDS,
        device_class=SensorDeviceClass.DURATION,
        state_class=SensorStateClass.MEASUREMENT,
        entity_category=EntityCategory.DIAGNOSTIC,
        entity_registry_enabled_default=False,
        value=lambda d: d.info.get("uptime"),
    ),
    NinstripSensorDescription(
        key="free_heap",
        translation_key="free_heap",
        native_unit_of_measurement=UnitOfInformation.BYTES,
        device_class=SensorDeviceClass.DATA_SIZE,
        state_class=SensorStateClass.MEASUREMENT,
        entity_category=EntityCategory.DIAGNOSTIC,
        entity_registry_enabled_default=False,
        value=lambda d: d.info.get("free_heap"),
    ),
    # Sagt, ob die Strombegrenzung gerade herunterregelt. 100 heisst: nein.
    NinstripSensorDescription(
        key="power_scale",
        translation_key="power_scale",
        native_unit_of_measurement="%",
        state_class=SensorStateClass.MEASUREMENT,
        entity_category=EntityCategory.DIAGNOSTIC,
        value=lambda d: _strip(d, "power_scale"),
    ),
)


async def async_setup_entry(
    hass: HomeAssistant,
    entry: NinstripConfigEntry,
    async_add_entities: AddConfigEntryEntitiesCallback,
) -> None:
    coordinator = entry.runtime_data
    async_add_entities(NinstripSensor(coordinator, d) for d in SENSORS)


class NinstripSensor(NinstripEntity, SensorEntity):
    entity_description: NinstripSensorDescription

    def __init__(
        self, coordinator: NinstripCoordinator, description: NinstripSensorDescription
    ) -> None:
        super().__init__(coordinator, description.key)
        self.entity_description = description

    @property
    def native_value(self) -> Any:
        return self.entity_description.value(self.coordinator.data)