"""Binary sensor platform for Rehlko integration."""

from dataclasses import dataclass
import logging

from homeassistant.components.binary_sensor import (
    BinarySensorDeviceClass,
    BinarySensorEntity,
    BinarySensorEntityDescription,
)
from homeassistant.const import EntityCategory
from homeassistant.core import HomeAssistant
from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback

from .const import (
    DEVICE_DATA_DEVICES,
    DEVICE_DATA_ID,
    DEVICE_DATA_IS_CONNECTED,
    GENERATOR_DATA_DEVICE,
)
from .coordinator import RehlkoConfigEntry, RehlkoUpdateCoordinator
from .entity import RehlkoEntity

# Coordinator is used to centralize the data updates
PARALLEL_UPDATES = 0

_LOGGER = logging.getLogger(__name__)


@dataclass(frozen=True, kw_only=True)
class RehlkoBinarySensorEntityDescription(BinarySensorEntityDescription):
    """Class describing Rehlko binary sensor entities."""

    on_value: str | bool = True
    off_value: str | bool = False
    document_key: str | None = None
    connectivity_key: str | None = DEVICE_DATA_IS_CONNECTED


BINARY_SENSORS: tuple[RehlkoBinarySensorEntityDescription, ...] = (
    RehlkoBinarySensorEntityDescription(
        key=DEVICE_DATA_IS_CONNECTED,
        device_class=BinarySensorDeviceClass.CONNECTIVITY,
        entity_category=EntityCategory.DIAGNOSTIC,
        document_key=GENERATOR_DATA_DEVICE,
        # Entity is available when the device is disconnected
        connectivity_key=None,
    ),
    RehlkoBinarySensorEntityDescription(
        key="switchState",
        translation_key="auto_run",
        on_value="Auto",
        off_value="Off",
    ),
    RehlkoBinarySensorEntityDescription(
        key="engineOilPressureOk",
        translation_key="oil_pressure",
        device_class=BinarySensorDeviceClass.PROBLEM,
        entity_category=EntityCategory.DIAGNOSTIC,
        on_value=False,
        off_value=True,
    ),
)


async def async_setup_entry(
    hass: HomeAssistant,
    config_entry: RehlkoConfigEntry,
    async_add_entities: AddConfigEntryEntitiesCallback,
) -> None:
    """Set up the binary sensor platform."""
    homes = config_entry.runtime_data.homes
    coordinators = config_entry.runtime_data.coordinators
    entities: list[BinarySensorEntity] = []

    for home_data in homes:
        for device_data in home_data[DEVICE_DATA_DEVICES]:
            device_id = device_data[DEVICE_DATA_ID]
            coordinator = coordinators[device_id]

            # Add standard binary sensors
            entities.extend(
                RehlkoBinarySensorEntity(
                    coordinator,
                    device_id,
                    device_data,
                    sensor_description,
                    document_key=sensor_description.document_key,
                    connectivity_key=sensor_description.connectivity_key,
                )
                for sensor_description in BINARY_SENSORS
            )

            # Add loadshed binary sensors if loadshed data is available
            if (loadshed_data := coordinator.data.get("loadShed")) and (
                parameters := loadshed_data.get("parameters")
            ):
                entities.extend(
                    RehlkoLoadshedBinarySensorEntity(
                        coordinator,
                        device_id,
                        device_data,
                        parameter["definitionId"],
                        parameter["displayName"],
                    )
                    for parameter in parameters
                )

    async_add_entities(entities)


class RehlkoBinarySensorEntity(RehlkoEntity, BinarySensorEntity):
    """Representation of a Binary Sensor."""

    entity_description: RehlkoBinarySensorEntityDescription

    @property
    def is_on(self) -> bool | None:
        """Return the state of the binary sensor."""
        if self._rehlko_value == self.entity_description.on_value:
            return True
        if self._rehlko_value == self.entity_description.off_value:
            return False
        _LOGGER.warning(
            "Unexpected value for %s: %s",
            self.entity_description.key,
            self._rehlko_value,
        )
        return None


class RehlkoLoadshedBinarySensorEntity(RehlkoEntity, BinarySensorEntity):
    """Representation of a Loadshed Binary Sensor."""

    def __init__(
        self,
        coordinator: RehlkoUpdateCoordinator,
        device_id: int,
        device_data: dict,
        definition_id: int,
        display_name: str,
    ) -> None:
        """Initialize the loadshed binary sensor."""
        # Create a synthetic entity description for this loadshed parameter
        description = BinarySensorEntityDescription(
            key=f"loadshed_{definition_id}",
            translation_key="loadshed_parameter",
            entity_registry_enabled_default=False,
        )
        self._definition_id = definition_id
        super().__init__(
            coordinator,
            device_id,
            device_data,
            description,
            document_key=None,
            connectivity_key=DEVICE_DATA_IS_CONNECTED,
        )
        # Use translation placeholders for the dynamic display name
        self._attr_translation_placeholders = {"display_name": display_name}

    @property
    def is_on(self) -> bool | None:
        """Return the state of the binary sensor."""
        if not (loadshed_data := self.coordinator.data.get("loadShed")) or not (
            parameters := loadshed_data.get("parameters")
        ):
            return None

        return next(
            (
                parameter.get("value")
                for parameter in parameters
                if parameter["definitionId"] == self._definition_id
            ),
            None,
        )