"""Sensor for displaying the number of result from Flume."""
from datetime import timedelta
import logging
from numbers import Number

from pyflume import FlumeData
import voluptuous as vol

from homeassistant.components.sensor import PLATFORM_SCHEMA, SensorEntity
from homeassistant.config_entries import SOURCE_IMPORT
from homeassistant.const import (
    CONF_CLIENT_ID,
    CONF_CLIENT_SECRET,
    CONF_NAME,
    CONF_PASSWORD,
    CONF_USERNAME,
)
import homeassistant.helpers.config_validation as cv
from homeassistant.helpers.update_coordinator import (
    CoordinatorEntity,
    DataUpdateCoordinator,
    UpdateFailed,
)

from .const import (
    DEFAULT_NAME,
    DOMAIN,
    FLUME_AUTH,
    FLUME_DEVICES,
    FLUME_HTTP_SESSION,
    FLUME_QUERIES_SENSOR,
    FLUME_TYPE_SENSOR,
    KEY_DEVICE_ID,
    KEY_DEVICE_LOCATION,
    KEY_DEVICE_LOCATION_NAME,
    KEY_DEVICE_LOCATION_TIMEZONE,
    KEY_DEVICE_TYPE,
)

_LOGGER = logging.getLogger(__name__)

MIN_TIME_BETWEEN_UPDATES = timedelta(seconds=15)
SCAN_INTERVAL = timedelta(minutes=1)

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
    {
        vol.Required(CONF_USERNAME): cv.string,
        vol.Required(CONF_PASSWORD): cv.string,
        vol.Required(CONF_CLIENT_ID): cv.string,
        vol.Required(CONF_CLIENT_SECRET): cv.string,
        vol.Optional(CONF_NAME): cv.string,
    }
)


async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
    """Import the platform into a config entry."""
    hass.async_create_task(
        hass.config_entries.flow.async_init(
            DOMAIN, context={"source": SOURCE_IMPORT}, data=config
        )
    )


async def async_setup_entry(hass, config_entry, async_add_entities):
    """Set up the Flume sensor."""
    flume_domain_data = hass.data[DOMAIN][config_entry.entry_id]

    flume_auth = flume_domain_data[FLUME_AUTH]
    http_session = flume_domain_data[FLUME_HTTP_SESSION]
    flume_devices = flume_domain_data[FLUME_DEVICES]

    config = config_entry.data
    name = config.get(CONF_NAME, DEFAULT_NAME)

    flume_entity_list = []
    for device in flume_devices.device_list:
        if device[KEY_DEVICE_TYPE] != FLUME_TYPE_SENSOR:
            continue

        device_id = device[KEY_DEVICE_ID]
        device_name = device[KEY_DEVICE_LOCATION][KEY_DEVICE_LOCATION_NAME]
        device_timezone = device[KEY_DEVICE_LOCATION][KEY_DEVICE_LOCATION_TIMEZONE]
        device_friendly_name = f"{name} {device_name}"
        flume_device = FlumeData(
            flume_auth,
            device_id,
            device_timezone,
            SCAN_INTERVAL,
            update_on_init=False,
            http_session=http_session,
        )

        coordinator = _create_flume_device_coordinator(hass, flume_device)

        for flume_query_sensor in FLUME_QUERIES_SENSOR.items():
            flume_entity_list.append(
                FlumeSensor(
                    coordinator,
                    flume_device,
                    flume_query_sensor,
                    f"{device_friendly_name} {flume_query_sensor[1]['friendly_name']}",
                    device_id,
                )
            )

    if flume_entity_list:
        async_add_entities(flume_entity_list)


class FlumeSensor(CoordinatorEntity, SensorEntity):
    """Representation of the Flume sensor."""

    def __init__(self, coordinator, flume_device, flume_query_sensor, name, device_id):
        """Initialize the Flume sensor."""
        super().__init__(coordinator)
        self._flume_device = flume_device
        self._flume_query_sensor = flume_query_sensor
        self._name = name
        self._device_id = device_id
        self._state = None

    @property
    def device_info(self):
        """Device info for the flume sensor."""
        return {
            "name": self._name,
            "identifiers": {(DOMAIN, self._device_id)},
            "manufacturer": "Flume, Inc.",
            "model": "Flume Smart Water Monitor",
        }

    @property
    def name(self):
        """Return the name of the sensor."""
        return self._name

    @property
    def state(self):
        """Return the state of the sensor."""
        sensor_key = self._flume_query_sensor[0]
        if sensor_key not in self._flume_device.values:
            return None

        return _format_state_value(self._flume_device.values[sensor_key])

    @property
    def unit_of_measurement(self):
        """Return the unit the value is expressed in."""
        # This is in gallons per SCAN_INTERVAL
        return self._flume_query_sensor[1]["unit_of_measurement"]

    @property
    def unique_id(self):
        """Flume query and Device unique ID."""
        return f"{self._flume_query_sensor[0]}_{self._device_id}"

    async def async_added_to_hass(self):
        """Request an update when added."""
        await super().async_added_to_hass()
        # We do not ask for an update with async_add_entities()
        # because it will update disabled entities
        await self.coordinator.async_request_refresh()


def _format_state_value(value):
    return round(value, 1) if isinstance(value, Number) else None


def _create_flume_device_coordinator(hass, flume_device):
    """Create a data coordinator for the flume device."""

    async def _async_update_data():
        """Get the latest data from the Flume."""
        _LOGGER.debug("Updating Flume data")
        try:
            await hass.async_add_executor_job(flume_device.update_force)
        except Exception as ex:
            raise UpdateFailed(f"Error communicating with flume API: {ex}") from ex
        _LOGGER.debug(
            "Flume update details: %s",
            {
                "values": flume_device.values,
                "query_payload": flume_device.query_payload,
            },
        )

    return DataUpdateCoordinator(
        hass,
        _LOGGER,
        # Name of the data. For logging purposes.
        name=flume_device.device_id,
        update_method=_async_update_data,
        # Polling interval. Will only be polled if there are subscribers.
        update_interval=SCAN_INTERVAL,
    )