"""Support for the Airly sensor service."""
from homeassistant.const import (
    ATTR_ATTRIBUTION,
    ATTR_DEVICE_CLASS,
    CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
    CONF_NAME,
    DEVICE_CLASS_HUMIDITY,
    DEVICE_CLASS_PRESSURE,
    DEVICE_CLASS_TEMPERATURE,
    PERCENTAGE,
    PRESSURE_HPA,
    TEMP_CELSIUS,
)
from homeassistant.helpers.update_coordinator import CoordinatorEntity

from .const import (
    ATTR_API_HUMIDITY,
    ATTR_API_PM1,
    ATTR_API_PRESSURE,
    ATTR_API_TEMPERATURE,
    DEFAULT_NAME,
    DOMAIN,
    MANUFACTURER,
)

ATTRIBUTION = "Data provided by Airly"

ATTR_ICON = "icon"
ATTR_LABEL = "label"
ATTR_UNIT = "unit"

PARALLEL_UPDATES = 1

SENSOR_TYPES = {
    ATTR_API_PM1: {
        ATTR_DEVICE_CLASS: None,
        ATTR_ICON: "mdi:blur",
        ATTR_LABEL: ATTR_API_PM1,
        ATTR_UNIT: CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
    },
    ATTR_API_HUMIDITY: {
        ATTR_DEVICE_CLASS: DEVICE_CLASS_HUMIDITY,
        ATTR_ICON: None,
        ATTR_LABEL: ATTR_API_HUMIDITY.capitalize(),
        ATTR_UNIT: PERCENTAGE,
    },
    ATTR_API_PRESSURE: {
        ATTR_DEVICE_CLASS: DEVICE_CLASS_PRESSURE,
        ATTR_ICON: None,
        ATTR_LABEL: ATTR_API_PRESSURE.capitalize(),
        ATTR_UNIT: PRESSURE_HPA,
    },
    ATTR_API_TEMPERATURE: {
        ATTR_DEVICE_CLASS: DEVICE_CLASS_TEMPERATURE,
        ATTR_ICON: None,
        ATTR_LABEL: ATTR_API_TEMPERATURE.capitalize(),
        ATTR_UNIT: TEMP_CELSIUS,
    },
}


async def async_setup_entry(hass, config_entry, async_add_entities):
    """Set up Airly sensor entities based on a config entry."""
    name = config_entry.data[CONF_NAME]

    coordinator = hass.data[DOMAIN][config_entry.entry_id]

    sensors = []
    for sensor in SENSOR_TYPES:
        # When we use the nearest method, we are not sure which sensors are available
        if coordinator.data.get(sensor):
            sensors.append(AirlySensor(coordinator, name, sensor))

    async_add_entities(sensors, False)


class AirlySensor(CoordinatorEntity):
    """Define an Airly sensor."""

    def __init__(self, coordinator, name, kind):
        """Initialize."""
        super().__init__(coordinator)
        self._name = name
        self.kind = kind
        self._device_class = None
        self._state = None
        self._icon = None
        self._unit_of_measurement = None
        self._attrs = {ATTR_ATTRIBUTION: ATTRIBUTION}

    @property
    def name(self):
        """Return the name."""
        return f"{self._name} {SENSOR_TYPES[self.kind][ATTR_LABEL]}"

    @property
    def state(self):
        """Return the state."""
        self._state = self.coordinator.data[self.kind]
        if self.kind in [ATTR_API_PM1, ATTR_API_PRESSURE]:
            self._state = round(self._state)
        if self.kind in [ATTR_API_TEMPERATURE, ATTR_API_HUMIDITY]:
            self._state = round(self._state, 1)
        return self._state

    @property
    def device_state_attributes(self):
        """Return the state attributes."""
        return self._attrs

    @property
    def icon(self):
        """Return the icon."""
        self._icon = SENSOR_TYPES[self.kind][ATTR_ICON]
        return self._icon

    @property
    def device_class(self):
        """Return the device_class."""
        return SENSOR_TYPES[self.kind][ATTR_DEVICE_CLASS]

    @property
    def unique_id(self):
        """Return a unique_id for this entity."""
        return f"{self.coordinator.latitude}-{self.coordinator.longitude}-{self.kind.lower()}"

    @property
    def device_info(self):
        """Return the device info."""
        return {
            "identifiers": {
                (DOMAIN, self.coordinator.latitude, self.coordinator.longitude)
            },
            "name": DEFAULT_NAME,
            "manufacturer": MANUFACTURER,
            "entry_type": "service",
        }

    @property
    def unit_of_measurement(self):
        """Return the unit the value is expressed in."""
        return SENSOR_TYPES[self.kind][ATTR_UNIT]