"""Support for generic GeoJSON events."""
from __future__ import annotations

from collections.abc import Callable
from datetime import timedelta
import logging
from typing import Any

from aio_geojson_generic_client import GenericFeedManager
from aio_geojson_generic_client.feed_entry import GenericFeedEntry
import voluptuous as vol

from homeassistant.components.geo_location import PLATFORM_SCHEMA, GeolocationEvent
from homeassistant.const import (
    CONF_LATITUDE,
    CONF_LONGITUDE,
    CONF_RADIUS,
    CONF_SCAN_INTERVAL,
    CONF_URL,
    EVENT_HOMEASSISTANT_START,
    UnitOfLength,
)
from homeassistant.core import Event, HomeAssistant, callback
import homeassistant.helpers.config_validation as cv
from homeassistant.helpers.dispatcher import async_dispatcher_connect
from homeassistant.helpers.entity_platform import AddEntitiesCallback
from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType

from .manager import GeoJsonFeedEntityManager

_LOGGER = logging.getLogger(__name__)

ATTR_EXTERNAL_ID = "external_id"

DEFAULT_RADIUS_IN_KM = 20.0

SCAN_INTERVAL = timedelta(minutes=5)

SOURCE = "geo_json_events"

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
    {
        vol.Required(CONF_URL): cv.string,
        vol.Optional(CONF_LATITUDE): cv.latitude,
        vol.Optional(CONF_LONGITUDE): cv.longitude,
        vol.Optional(CONF_RADIUS, default=DEFAULT_RADIUS_IN_KM): vol.Coerce(float),
    }
)


async def async_setup_platform(
    hass: HomeAssistant,
    config: ConfigType,
    async_add_entities: AddEntitiesCallback,
    discovery_info: DiscoveryInfoType | None = None,
) -> None:
    """Set up the GeoJSON Events platform."""
    url: str = config[CONF_URL]
    scan_interval: timedelta = config.get(CONF_SCAN_INTERVAL, SCAN_INTERVAL)
    coordinates: tuple[float, float] = (
        config.get(CONF_LATITUDE, hass.config.latitude),
        config.get(CONF_LONGITUDE, hass.config.longitude),
    )
    radius_in_km: float = config[CONF_RADIUS]
    # Initialize the entity manager.
    manager = GeoJsonFeedEntityManager(
        hass, scan_interval, coordinates, url, radius_in_km
    )

    @callback
    def async_add_geolocation(
        feed_manager: GenericFeedManager,
        external_id: str,
    ) -> None:
        """Add geolocation entity from feed."""
        new_entity = GeoJsonLocationEvent(feed_manager, external_id)
        _LOGGER.debug("Adding geolocation %s", new_entity)
        async_add_entities([new_entity], True)

    async_dispatcher_connect(hass, manager.signal_new_entity, async_add_geolocation)

    await manager.async_init()

    async def start_feed_manager(event: Event) -> None:
        """Start feed manager."""
        await manager.async_update()

    hass.bus.async_listen_once(EVENT_HOMEASSISTANT_START, start_feed_manager)


class GeoJsonLocationEvent(GeolocationEvent):
    """Represents an external event with GeoJSON data."""

    _attr_should_poll = False
    _attr_source = SOURCE
    _attr_unit_of_measurement = UnitOfLength.KILOMETERS

    def __init__(self, feed_manager: GenericFeedManager, external_id: str) -> None:
        """Initialize entity with data from feed entry."""
        self._feed_manager = feed_manager
        self._external_id = external_id
        self._remove_signal_delete: Callable[[], None]
        self._remove_signal_update: Callable[[], None]

    async def async_added_to_hass(self) -> None:
        """Call when entity is added to hass."""
        self._remove_signal_delete = async_dispatcher_connect(
            self.hass,
            f"geo_json_events_delete_{self._external_id}",
            self._delete_callback,
        )
        self._remove_signal_update = async_dispatcher_connect(
            self.hass,
            f"geo_json_events_update_{self._external_id}",
            self._update_callback,
        )

    @callback
    def _delete_callback(self) -> None:
        """Remove this entity."""
        self._remove_signal_delete()
        self._remove_signal_update()
        self.hass.async_create_task(self.async_remove(force_remove=True))

    @callback
    def _update_callback(self) -> None:
        """Call update method."""
        self.async_schedule_update_ha_state(True)

    async def async_update(self) -> None:
        """Update this entity from the data held in the feed manager."""
        _LOGGER.debug("Updating %s", self._external_id)
        feed_entry = self._feed_manager.get_entry(self._external_id)
        if feed_entry:
            self._update_from_feed(feed_entry)

    def _update_from_feed(self, feed_entry: GenericFeedEntry) -> None:
        """Update the internal state from the provided feed entry."""
        self._attr_name = feed_entry.title
        self._attr_distance = feed_entry.distance_to_home
        self._attr_latitude = feed_entry.coordinates[0]
        self._attr_longitude = feed_entry.coordinates[1]

    @property
    def extra_state_attributes(self) -> dict[str, Any]:
        """Return the device state attributes."""
        if not self._external_id:
            return {}
        return {ATTR_EXTERNAL_ID: self._external_id}
