"""Support for airthings ble sensors."""
from __future__ import annotations

import dataclasses
import logging

from airthings_ble import AirthingsDevice

from homeassistant.components.sensor import (
    SensorDeviceClass,
    SensorEntity,
    SensorEntityDescription,
    SensorStateClass,
)
from homeassistant.config_entries import ConfigEntry
from homeassistant.const import (
    CONCENTRATION_PARTS_PER_BILLION,
    CONCENTRATION_PARTS_PER_MILLION,
    LIGHT_LUX,
    PERCENTAGE,
    EntityCategory,
    Platform,
    UnitOfPressure,
    UnitOfTemperature,
)
from homeassistant.core import HomeAssistant, callback
from homeassistant.helpers.device_registry import (
    CONNECTION_BLUETOOTH,
    DeviceInfo,
    async_get as device_async_get,
)
from homeassistant.helpers.entity_platform import AddEntitiesCallback
from homeassistant.helpers.entity_registry import (
    RegistryEntry,
    async_entries_for_device,
    async_get as entity_async_get,
)
from homeassistant.helpers.typing import StateType
from homeassistant.helpers.update_coordinator import (
    CoordinatorEntity,
    DataUpdateCoordinator,
)
from homeassistant.util.unit_system import METRIC_SYSTEM

from .const import DOMAIN, VOLUME_BECQUEREL, VOLUME_PICOCURIE

_LOGGER = logging.getLogger(__name__)

SENSORS_MAPPING_TEMPLATE: dict[str, SensorEntityDescription] = {
    "radon_1day_avg": SensorEntityDescription(
        key="radon_1day_avg",
        translation_key="radon_1day_avg",
        native_unit_of_measurement=VOLUME_BECQUEREL,
        state_class=SensorStateClass.MEASUREMENT,
    ),
    "radon_longterm_avg": SensorEntityDescription(
        key="radon_longterm_avg",
        translation_key="radon_longterm_avg",
        native_unit_of_measurement=VOLUME_BECQUEREL,
        state_class=SensorStateClass.MEASUREMENT,
    ),
    "radon_1day_level": SensorEntityDescription(
        key="radon_1day_level",
        translation_key="radon_1day_level",
    ),
    "radon_longterm_level": SensorEntityDescription(
        key="radon_longterm_level",
        translation_key="radon_longterm_level",
    ),
    "temperature": SensorEntityDescription(
        key="temperature",
        device_class=SensorDeviceClass.TEMPERATURE,
        native_unit_of_measurement=UnitOfTemperature.CELSIUS,
        state_class=SensorStateClass.MEASUREMENT,
    ),
    "humidity": SensorEntityDescription(
        key="humidity",
        device_class=SensorDeviceClass.HUMIDITY,
        native_unit_of_measurement=PERCENTAGE,
        state_class=SensorStateClass.MEASUREMENT,
    ),
    "pressure": SensorEntityDescription(
        key="pressure",
        device_class=SensorDeviceClass.PRESSURE,
        native_unit_of_measurement=UnitOfPressure.MBAR,
        state_class=SensorStateClass.MEASUREMENT,
    ),
    "battery": SensorEntityDescription(
        key="battery",
        device_class=SensorDeviceClass.BATTERY,
        native_unit_of_measurement=PERCENTAGE,
        state_class=SensorStateClass.MEASUREMENT,
        entity_category=EntityCategory.DIAGNOSTIC,
    ),
    "co2": SensorEntityDescription(
        key="co2",
        device_class=SensorDeviceClass.CO2,
        native_unit_of_measurement=CONCENTRATION_PARTS_PER_MILLION,
        state_class=SensorStateClass.MEASUREMENT,
    ),
    "voc": SensorEntityDescription(
        key="voc",
        device_class=SensorDeviceClass.VOLATILE_ORGANIC_COMPOUNDS_PARTS,
        native_unit_of_measurement=CONCENTRATION_PARTS_PER_BILLION,
        state_class=SensorStateClass.MEASUREMENT,
    ),
    "illuminance": SensorEntityDescription(
        key="illuminance",
        device_class=SensorDeviceClass.ILLUMINANCE,
        native_unit_of_measurement=LIGHT_LUX,
        state_class=SensorStateClass.MEASUREMENT,
    ),
}


@callback
def async_migrate(hass: HomeAssistant, address: str, sensor_name: str) -> None:
    """Migrate entities to new unique ids (with BLE Address)."""
    ent_reg = entity_async_get(hass)
    unique_id_trailer = f"_{sensor_name}"
    new_unique_id = f"{address}{unique_id_trailer}"
    if ent_reg.async_get_entity_id(DOMAIN, Platform.SENSOR, new_unique_id):
        # New unique id already exists
        return
    dev_reg = device_async_get(hass)
    if not (
        device := dev_reg.async_get_device(
            connections={(CONNECTION_BLUETOOTH, address)}
        )
    ):
        return
    entities = async_entries_for_device(
        ent_reg,
        device_id=device.id,
        include_disabled_entities=True,
    )
    matching_reg_entry: RegistryEntry | None = None
    for entry in entities:
        if entry.unique_id.endswith(unique_id_trailer) and (
            not matching_reg_entry or "(" not in entry.unique_id
        ):
            matching_reg_entry = entry
    if not matching_reg_entry or matching_reg_entry.unique_id == new_unique_id:
        # Already has the newest unique id format
        return
    entity_id = matching_reg_entry.entity_id
    ent_reg.async_update_entity(entity_id=entity_id, new_unique_id=new_unique_id)
    _LOGGER.debug("Migrated entity '%s' to unique id '%s'", entity_id, new_unique_id)


async def async_setup_entry(
    hass: HomeAssistant,
    entry: ConfigEntry,
    async_add_entities: AddEntitiesCallback,
) -> None:
    """Set up the Airthings BLE sensors."""
    is_metric = hass.config.units is METRIC_SYSTEM

    coordinator: DataUpdateCoordinator[AirthingsDevice] = hass.data[DOMAIN][
        entry.entry_id
    ]

    # we need to change some units
    sensors_mapping = SENSORS_MAPPING_TEMPLATE.copy()
    if not is_metric:
        for key, val in sensors_mapping.items():
            if val.native_unit_of_measurement is not VOLUME_BECQUEREL:
                continue
            sensors_mapping[key] = dataclasses.replace(
                val,
                native_unit_of_measurement=VOLUME_PICOCURIE,
            )

    entities = []
    _LOGGER.debug("got sensors: %s", coordinator.data.sensors)
    for sensor_type, sensor_value in coordinator.data.sensors.items():
        if sensor_type not in sensors_mapping:
            _LOGGER.debug(
                "Unknown sensor type detected: %s, %s",
                sensor_type,
                sensor_value,
            )
            continue
        async_migrate(hass, coordinator.data.address, sensor_type)
        entities.append(
            AirthingsSensor(coordinator, coordinator.data, sensors_mapping[sensor_type])
        )

    async_add_entities(entities)


class AirthingsSensor(
    CoordinatorEntity[DataUpdateCoordinator[AirthingsDevice]], SensorEntity
):
    """Airthings BLE sensors for the device."""

    _attr_has_entity_name = True

    def __init__(
        self,
        coordinator: DataUpdateCoordinator[AirthingsDevice],
        airthings_device: AirthingsDevice,
        entity_description: SensorEntityDescription,
    ) -> None:
        """Populate the airthings entity with relevant data."""
        super().__init__(coordinator)
        self.entity_description = entity_description

        name = airthings_device.name
        if identifier := airthings_device.identifier:
            name += f" ({identifier})"

        self._attr_unique_id = f"{airthings_device.address}_{entity_description.key}"
        self._attr_device_info = DeviceInfo(
            connections={
                (
                    CONNECTION_BLUETOOTH,
                    airthings_device.address,
                )
            },
            name=name,
            manufacturer=airthings_device.manufacturer,
            hw_version=airthings_device.hw_version,
            sw_version=airthings_device.sw_version,
            model=airthings_device.model,
        )

    @property
    def available(self) -> bool:
        """Check if device and sensor is available in data."""
        return (
            super().available
            and self.entity_description.key in self.coordinator.data.sensors
        )

    @property
    def native_value(self) -> StateType:
        """Return the value reported by the sensor."""
        return self.coordinator.data.sensors[self.entity_description.key]