"""Support for Notion."""
import asyncio
import logging

from aionotion import async_get_client
from aionotion.errors import InvalidCredentialsError, NotionError
import voluptuous as vol

from homeassistant.config_entries import SOURCE_IMPORT
from homeassistant.const import ATTR_ATTRIBUTION, CONF_PASSWORD, CONF_USERNAME
from homeassistant.core import callback
from homeassistant.exceptions import ConfigEntryNotReady
from homeassistant.helpers import (
    aiohttp_client,
    config_validation as cv,
    device_registry as dr,
)
from homeassistant.helpers.dispatcher import (
    async_dispatcher_connect,
    async_dispatcher_send,
)
from homeassistant.helpers.entity import Entity
from homeassistant.helpers.event import async_track_time_interval

from .config_flow import configured_instances
from .const import DATA_CLIENT, DEFAULT_SCAN_INTERVAL, DOMAIN, TOPIC_DATA_UPDATE

_LOGGER = logging.getLogger(__name__)

ATTR_SYSTEM_MODE = "system_mode"
ATTR_SYSTEM_NAME = "system_name"

DATA_LISTENER = "listener"

DEFAULT_ATTRIBUTION = "Data provided by Notion"

SENSOR_BATTERY = "low_battery"
SENSOR_DOOR = "door"
SENSOR_GARAGE_DOOR = "garage_door"
SENSOR_LEAK = "leak"
SENSOR_MISSING = "missing"
SENSOR_SAFE = "safe"
SENSOR_SLIDING = "sliding"
SENSOR_SMOKE_CO = "alarm"
SENSOR_TEMPERATURE = "temperature"
SENSOR_WINDOW_HINGED_HORIZONTAL = "window_hinged_horizontal"
SENSOR_WINDOW_HINGED_VERTICAL = "window_hinged_vertical"

BINARY_SENSOR_TYPES = {
    SENSOR_BATTERY: ("Low Battery", "battery"),
    SENSOR_DOOR: ("Door", "door"),
    SENSOR_GARAGE_DOOR: ("Garage Door", "garage_door"),
    SENSOR_LEAK: ("Leak Detector", "moisture"),
    SENSOR_MISSING: ("Missing", "connectivity"),
    SENSOR_SAFE: ("Safe", "door"),
    SENSOR_SLIDING: ("Sliding Door/Window", "door"),
    SENSOR_SMOKE_CO: ("Smoke/Carbon Monoxide Detector", "smoke"),
    SENSOR_WINDOW_HINGED_HORIZONTAL: ("Hinged Window", "window"),
    SENSOR_WINDOW_HINGED_VERTICAL: ("Hinged Window", "window"),
}
SENSOR_TYPES = {SENSOR_TEMPERATURE: ("Temperature", "temperature", "°C")}

CONFIG_SCHEMA = vol.Schema(
    {
        DOMAIN: vol.Schema(
            {
                vol.Required(CONF_USERNAME): cv.string,
                vol.Required(CONF_PASSWORD): cv.string,
            }
        )
    },
    extra=vol.ALLOW_EXTRA,
)


async def async_setup(hass, config):
    """Set up the Notion component."""
    hass.data[DOMAIN] = {}
    hass.data[DOMAIN][DATA_CLIENT] = {}
    hass.data[DOMAIN][DATA_LISTENER] = {}

    if DOMAIN not in config:
        return True

    conf = config[DOMAIN]

    if conf[CONF_USERNAME] in configured_instances(hass):
        return True

    hass.async_create_task(
        hass.config_entries.flow.async_init(
            DOMAIN,
            context={"source": SOURCE_IMPORT},
            data={
                CONF_USERNAME: conf[CONF_USERNAME],
                CONF_PASSWORD: conf[CONF_PASSWORD],
            },
        )
    )

    return True


async def async_setup_entry(hass, config_entry):
    """Set up Notion as a config entry."""
    session = aiohttp_client.async_get_clientsession(hass)

    try:
        client = await async_get_client(
            config_entry.data[CONF_USERNAME], config_entry.data[CONF_PASSWORD], session
        )
    except InvalidCredentialsError:
        _LOGGER.error("Invalid username and/or password")
        return False
    except NotionError as err:
        _LOGGER.error("Config entry failed: %s", err)
        raise ConfigEntryNotReady

    notion = Notion(hass, client, config_entry.entry_id)
    await notion.async_update()
    hass.data[DOMAIN][DATA_CLIENT][config_entry.entry_id] = notion

    for component in ("binary_sensor", "sensor"):
        hass.async_create_task(
            hass.config_entries.async_forward_entry_setup(config_entry, component)
        )

    async def refresh(event_time):
        """Refresh Notion sensor data."""
        _LOGGER.debug("Refreshing Notion sensor data")
        await notion.async_update()
        async_dispatcher_send(hass, TOPIC_DATA_UPDATE)

    hass.data[DOMAIN][DATA_LISTENER][config_entry.entry_id] = async_track_time_interval(
        hass, refresh, DEFAULT_SCAN_INTERVAL
    )

    return True


async def async_unload_entry(hass, config_entry):
    """Unload a Notion config entry."""
    hass.data[DOMAIN][DATA_CLIENT].pop(config_entry.entry_id)
    cancel = hass.data[DOMAIN][DATA_LISTENER].pop(config_entry.entry_id)
    cancel()

    tasks = [
        hass.config_entries.async_forward_entry_unload(config_entry, component)
        for component in ("binary_sensor", "sensor")
    ]

    await asyncio.gather(*tasks)

    return True


async def register_new_bridge(hass, bridge, config_entry_id):
    """Register a new bridge."""
    device_registry = await dr.async_get_registry(hass)
    device_registry.async_get_or_create(
        config_entry_id=config_entry_id,
        identifiers={(DOMAIN, bridge["hardware_id"])},
        manufacturer="Silicon Labs",
        model=bridge["hardware_revision"],
        name=bridge["name"] or bridge["id"],
        sw_version=bridge["firmware_version"]["wifi"],
    )


class Notion:
    """Define a class to handle the Notion API."""

    def __init__(self, hass, client, config_entry_id):
        """Initialize."""
        self._client = client
        self._config_entry_id = config_entry_id
        self._hass = hass
        self.bridges = {}
        self.sensors = {}
        self.tasks = {}

    async def async_update(self):
        """Get the latest Notion data."""
        tasks = {
            "bridges": self._client.bridge.async_all(),
            "sensors": self._client.sensor.async_all(),
            "tasks": self._client.task.async_all(),
        }

        results = await asyncio.gather(*tasks.values(), return_exceptions=True)
        for attr, result in zip(tasks, results):
            if isinstance(result, NotionError):
                _LOGGER.error("There was an error while updating %s: %s", attr, result)
                continue

            holding_pen = getattr(self, attr)
            for item in result:
                if attr == "bridges" and item["id"] not in holding_pen:
                    # If a new bridge is discovered, register it:
                    self._hass.async_create_task(
                        register_new_bridge(self._hass, item, self._config_entry_id)
                    )
                holding_pen[item["id"]] = item


class NotionEntity(Entity):
    """Define a base Notion entity."""

    def __init__(
        self, notion, task_id, sensor_id, bridge_id, system_id, name, device_class
    ):
        """Initialize the entity."""
        self._async_unsub_dispatcher_connect = None
        self._attrs = {ATTR_ATTRIBUTION: DEFAULT_ATTRIBUTION}
        self._bridge_id = bridge_id
        self._device_class = device_class
        self._name = name
        self._notion = notion
        self._sensor_id = sensor_id
        self._state = None
        self._system_id = system_id
        self._task_id = task_id

    @property
    def available(self):
        """Return True if entity is available."""
        return self._task_id in self._notion.tasks

    @property
    def device_class(self):
        """Return the device class."""
        return self._device_class

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

    @property
    def device_info(self):
        """Return device registry information for this entity."""
        bridge = self._notion.bridges.get(self._bridge_id, {})
        sensor = self._notion.sensors[self._sensor_id]

        return {
            "identifiers": {(DOMAIN, sensor["hardware_id"])},
            "manufacturer": "Silicon Labs",
            "model": sensor["hardware_revision"],
            "name": sensor["name"],
            "sw_version": sensor["firmware_version"],
            "via_device": (DOMAIN, bridge.get("hardware_id")),
        }

    @property
    def name(self):
        """Return the name of the sensor."""
        return "{0}: {1}".format(
            self._notion.sensors[self._sensor_id]["name"], self._name
        )

    @property
    def should_poll(self):
        """Disable entity polling."""
        return False

    @property
    def unique_id(self):
        """Return a unique, unchanging string that represents this sensor."""
        task = self._notion.tasks[self._task_id]
        return "{0}_{1}".format(self._sensor_id, task["task_type"])

    async def _update_bridge_id(self):
        """Update the entity's bridge ID if it has changed.

        Sensors can move to other bridges based on signal strength, etc.
        """
        sensor = self._notion.sensors[self._sensor_id]

        # If the sensor's bridge ID is the same as what we had before or if it points
        # to a bridge that doesn't exist (which can happen due to a Notion API bug),
        # return immediately:
        if (
            self._bridge_id == sensor["bridge"]["id"]
            or sensor["bridge"]["id"] not in self._notion.bridges
        ):
            return

        self._bridge_id = sensor["bridge"]["id"]

        device_registry = await dr.async_get_registry(self.hass)
        bridge = self._notion.bridges[self._bridge_id]
        bridge_device = device_registry.async_get_device(
            {DOMAIN: bridge["hardware_id"]}, set()
        )
        this_device = device_registry.async_get_device({DOMAIN: sensor["hardware_id"]})

        device_registry.async_update_device(
            this_device.id, via_device_id=bridge_device.id
        )

    async def async_added_to_hass(self):
        """Register callbacks."""

        @callback
        def update():
            """Update the entity."""
            self.hass.async_create_task(self._update_bridge_id())
            self.async_schedule_update_ha_state(True)

        self._async_unsub_dispatcher_connect = async_dispatcher_connect(
            self.hass, TOPIC_DATA_UPDATE, update
        )

    async def async_will_remove_from_hass(self):
        """Disconnect dispatcher listener when removed."""
        if self._async_unsub_dispatcher_connect:
            self._async_unsub_dispatcher_connect()
