"""Binary sensor entities for the Xiaoxiang Smart BMS integration."""
from __future__ import annotations

from homeassistant.components.binary_sensor import (
    BinarySensorDeviceClass,
    BinarySensorEntity,
    BinarySensorEntityDescription,
)
from homeassistant.config_entries import ConfigEntry
from homeassistant.core import HomeAssistant
from homeassistant.helpers.entity_platform import AddEntitiesCallback
from homeassistant.helpers.update_coordinator import CoordinatorEntity

from .const import DOMAIN
from .coordinator import BmsCoordinator

# ---------------------------------------------------------------------------
# Entity descriptions
# ---------------------------------------------------------------------------

BINARY_SENSORS: tuple[BinarySensorEntityDescription, ...] = (
    # -- MOS gate status --------------------------------------------------
    BinarySensorEntityDescription(
        key="mos_charge_enabled",
        name="Charge MOSFET",
        device_class=BinarySensorDeviceClass.BATTERY_CHARGING,
        icon="mdi:battery-charging",
    ),
    BinarySensorEntityDescription(
        key="mos_discharge_enabled",
        name="Discharge MOSFET",
        device_class=BinarySensorDeviceClass.POWER,
        icon="mdi:power-plug",
    ),
    # -- Cell balancing ---------------------------------------------------
    BinarySensorEntityDescription(
        key="balance_active",
        name="Cell Balancing",
        device_class=BinarySensorDeviceClass.RUNNING,
        icon="mdi:battery-sync",
    ),
    # -- Protection flags (True = protection triggered = problem) ---------
    BinarySensorEntityDescription(
        key="prot_cell_overvolt",
        name="Cell Over-Voltage",
        device_class=BinarySensorDeviceClass.PROBLEM,
        icon="mdi:battery-arrow-up",
    ),
    BinarySensorEntityDescription(
        key="prot_cell_undervolt",
        name="Cell Under-Voltage",
        device_class=BinarySensorDeviceClass.PROBLEM,
        icon="mdi:battery-arrow-down",
    ),
    BinarySensorEntityDescription(
        key="prot_pack_overvolt",
        name="Pack Over-Voltage",
        device_class=BinarySensorDeviceClass.PROBLEM,
        icon="mdi:battery-arrow-up",
    ),
    BinarySensorEntityDescription(
        key="prot_pack_undervolt",
        name="Pack Under-Voltage",
        device_class=BinarySensorDeviceClass.PROBLEM,
        icon="mdi:battery-arrow-down",
    ),
    BinarySensorEntityDescription(
        key="prot_charge_overtemp",
        name="Charge Over-Temperature",
        device_class=BinarySensorDeviceClass.PROBLEM,
        icon="mdi:thermometer-alert",
    ),
    BinarySensorEntityDescription(
        key="prot_charge_undertemp",
        name="Charge Under-Temperature",
        device_class=BinarySensorDeviceClass.PROBLEM,
        icon="mdi:thermometer-alert",
    ),
    BinarySensorEntityDescription(
        key="prot_discharge_overtemp",
        name="Discharge Over-Temperature",
        device_class=BinarySensorDeviceClass.PROBLEM,
        icon="mdi:thermometer-alert",
    ),
    BinarySensorEntityDescription(
        key="prot_discharge_undertemp",
        name="Discharge Under-Temperature",
        device_class=BinarySensorDeviceClass.PROBLEM,
        icon="mdi:thermometer-alert",
    ),
    BinarySensorEntityDescription(
        key="prot_charge_overcurrent",
        name="Charge Over-Current",
        device_class=BinarySensorDeviceClass.PROBLEM,
        icon="mdi:current-ac",
    ),
    BinarySensorEntityDescription(
        key="prot_discharge_overcurrent",
        name="Discharge Over-Current",
        device_class=BinarySensorDeviceClass.PROBLEM,
        icon="mdi:current-ac",
    ),
    BinarySensorEntityDescription(
        key="prot_short_circuit",
        name="Short Circuit",
        device_class=BinarySensorDeviceClass.PROBLEM,
        icon="mdi:flash-alert",
    ),
    BinarySensorEntityDescription(
        key="prot_frontend_ic_error",
        name="Frontend IC Error",
        device_class=BinarySensorDeviceClass.PROBLEM,
        icon="mdi:chip",
    ),
    BinarySensorEntityDescription(
        key="prot_software_lock",
        name="Software Lock",
        device_class=BinarySensorDeviceClass.PROBLEM,
        icon="mdi:lock-alert",
    ),
)


# ---------------------------------------------------------------------------
# Platform setup
# ---------------------------------------------------------------------------

async def async_setup_entry(
    hass: HomeAssistant,
    entry: ConfigEntry,
    async_add_entities: AddEntitiesCallback,
) -> None:
    coordinator: BmsCoordinator = hass.data[DOMAIN][entry.entry_id]
    async_add_entities(
        BmsBinarySensor(coordinator, description)
        for description in BINARY_SENSORS
    )


# ---------------------------------------------------------------------------
# Entity class
# ---------------------------------------------------------------------------

class BmsBinarySensor(CoordinatorEntity[BmsCoordinator], BinarySensorEntity):
    """A binary sensor backed by a boolean key in coordinator.data."""

    _attr_has_entity_name = True

    def __init__(
        self,
        coordinator: BmsCoordinator,
        description: BinarySensorEntityDescription,
    ) -> None:
        super().__init__(coordinator)
        self.entity_description = description
        self._attr_unique_id = f"{coordinator.address}_{description.key}"
        self._attr_device_info = coordinator.device_info

    @property
    def is_on(self) -> bool | None:
        return self.coordinator.data.get(self.entity_description.key)