"""Support for Apple HomeKit."""
import ipaddress
import logging
from zlib import adler32

import voluptuous as vol

from homeassistant.components import cover
from homeassistant.components.media_player import DEVICE_CLASS_TV
from homeassistant.const import (
    ATTR_DEVICE_CLASS,
    ATTR_ENTITY_ID,
    ATTR_SUPPORTED_FEATURES,
    ATTR_UNIT_OF_MEASUREMENT,
    CONF_IP_ADDRESS,
    CONF_NAME,
    CONF_PORT,
    CONF_TYPE,
    DEVICE_CLASS_HUMIDITY,
    DEVICE_CLASS_ILLUMINANCE,
    DEVICE_CLASS_TEMPERATURE,
    EVENT_HOMEASSISTANT_START,
    EVENT_HOMEASSISTANT_STOP,
    TEMP_CELSIUS,
    TEMP_FAHRENHEIT,
)
import homeassistant.helpers.config_validation as cv
from homeassistant.helpers.entityfilter import FILTER_SCHEMA
from homeassistant.util import get_local_ip
from homeassistant.util.decorator import Registry

from .const import (
    BRIDGE_NAME,
    CONF_AUTO_START,
    CONF_ENTITY_CONFIG,
    CONF_FEATURE_LIST,
    CONF_FILTER,
    CONF_SAFE_MODE,
    DEFAULT_AUTO_START,
    DEFAULT_PORT,
    DEFAULT_SAFE_MODE,
    DEVICE_CLASS_CO,
    DEVICE_CLASS_CO2,
    DEVICE_CLASS_PM25,
    DOMAIN,
    HOMEKIT_FILE,
    SERVICE_HOMEKIT_START,
    SERVICE_HOMEKIT_RESET_ACCESSORY,
    TYPE_FAUCET,
    TYPE_OUTLET,
    TYPE_SHOWER,
    TYPE_SPRINKLER,
    TYPE_SWITCH,
    TYPE_VALVE,
)

from .util import (
    show_setup_message,
    validate_entity_config,
    validate_media_player_features,
)

_LOGGER = logging.getLogger(__name__)

MAX_DEVICES = 100
TYPES = Registry()

# #### Driver Status ####
STATUS_READY = 0
STATUS_RUNNING = 1
STATUS_STOPPED = 2
STATUS_WAIT = 3

SWITCH_TYPES = {
    TYPE_FAUCET: "Valve",
    TYPE_OUTLET: "Outlet",
    TYPE_SHOWER: "Valve",
    TYPE_SPRINKLER: "Valve",
    TYPE_SWITCH: "Switch",
    TYPE_VALVE: "Valve",
}

CONFIG_SCHEMA = vol.Schema(
    {
        DOMAIN: vol.All(
            {
                vol.Optional(CONF_NAME, default=BRIDGE_NAME): vol.All(
                    cv.string, vol.Length(min=3, max=25)
                ),
                vol.Optional(CONF_PORT, default=DEFAULT_PORT): cv.port,
                vol.Optional(CONF_IP_ADDRESS): vol.All(ipaddress.ip_address, cv.string),
                vol.Optional(CONF_AUTO_START, default=DEFAULT_AUTO_START): cv.boolean,
                vol.Optional(CONF_SAFE_MODE, default=DEFAULT_SAFE_MODE): cv.boolean,
                vol.Optional(CONF_FILTER, default={}): FILTER_SCHEMA,
                vol.Optional(CONF_ENTITY_CONFIG, default={}): validate_entity_config,
            }
        )
    },
    extra=vol.ALLOW_EXTRA,
)

RESET_ACCESSORY_SERVICE_SCHEMA = vol.Schema(
    {vol.Required(ATTR_ENTITY_ID): cv.entity_ids}
)


async def async_setup(hass, config):
    """Set up the HomeKit component."""
    _LOGGER.debug("Begin setup HomeKit")

    conf = config[DOMAIN]
    name = conf[CONF_NAME]
    port = conf[CONF_PORT]
    ip_address = conf.get(CONF_IP_ADDRESS)
    auto_start = conf[CONF_AUTO_START]
    safe_mode = conf[CONF_SAFE_MODE]
    entity_filter = conf[CONF_FILTER]
    entity_config = conf[CONF_ENTITY_CONFIG]

    homekit = HomeKit(
        hass, name, port, ip_address, entity_filter, entity_config, safe_mode
    )
    await hass.async_add_executor_job(homekit.setup)

    def handle_homekit_reset_accessory(service):
        """Handle start HomeKit service call."""
        if homekit.status != STATUS_RUNNING:
            _LOGGER.warning(
                "HomeKit is not running. Either it is waiting to be "
                "started or has been stopped."
            )
            return

        entity_ids = service.data.get("entity_id")
        homekit.reset_accessories(entity_ids)

    hass.services.async_register(
        DOMAIN,
        SERVICE_HOMEKIT_RESET_ACCESSORY,
        handle_homekit_reset_accessory,
        schema=RESET_ACCESSORY_SERVICE_SCHEMA,
    )

    if auto_start:
        hass.bus.async_listen_once(EVENT_HOMEASSISTANT_START, homekit.start)
        return True

    def handle_homekit_service_start(service):
        """Handle start HomeKit service call."""
        if homekit.status != STATUS_READY:
            _LOGGER.warning(
                "HomeKit is not ready. Either it is already running or has "
                "been stopped."
            )
            return
        homekit.start()

    hass.services.async_register(
        DOMAIN, SERVICE_HOMEKIT_START, handle_homekit_service_start
    )

    return True


def get_accessory(hass, driver, state, aid, config):
    """Take state and return an accessory object if supported."""
    if not aid:
        _LOGGER.warning(
            'The entity "%s" is not supported, since it '
            "generates an invalid aid, please change it.",
            state.entity_id,
        )
        return None

    a_type = None
    name = config.get(CONF_NAME, state.name)

    if state.domain == "alarm_control_panel":
        a_type = "SecuritySystem"

    elif state.domain in ("binary_sensor", "device_tracker", "person"):
        a_type = "BinarySensor"

    elif state.domain == "climate":
        a_type = "Thermostat"

    elif state.domain == "cover":
        device_class = state.attributes.get(ATTR_DEVICE_CLASS)
        features = state.attributes.get(ATTR_SUPPORTED_FEATURES, 0)

        if device_class == "garage" and features & (
            cover.SUPPORT_OPEN | cover.SUPPORT_CLOSE
        ):
            a_type = "GarageDoorOpener"
        elif features & cover.SUPPORT_SET_POSITION:
            a_type = "WindowCovering"
        elif features & (cover.SUPPORT_OPEN | cover.SUPPORT_CLOSE):
            a_type = "WindowCoveringBasic"

    elif state.domain == "fan":
        a_type = "Fan"

    elif state.domain == "light":
        a_type = "Light"

    elif state.domain == "lock":
        a_type = "Lock"

    elif state.domain == "media_player":
        device_class = state.attributes.get(ATTR_DEVICE_CLASS)
        feature_list = config.get(CONF_FEATURE_LIST)

        if device_class == DEVICE_CLASS_TV:
            a_type = "TelevisionMediaPlayer"
        else:
            if feature_list and validate_media_player_features(state, feature_list):
                a_type = "MediaPlayer"

    elif state.domain == "sensor":
        device_class = state.attributes.get(ATTR_DEVICE_CLASS)
        unit = state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)

        if device_class == DEVICE_CLASS_TEMPERATURE or unit in (
            TEMP_CELSIUS,
            TEMP_FAHRENHEIT,
        ):
            a_type = "TemperatureSensor"
        elif device_class == DEVICE_CLASS_HUMIDITY and unit == "%":
            a_type = "HumiditySensor"
        elif device_class == DEVICE_CLASS_PM25 or DEVICE_CLASS_PM25 in state.entity_id:
            a_type = "AirQualitySensor"
        elif device_class == DEVICE_CLASS_CO:
            a_type = "CarbonMonoxideSensor"
        elif device_class == DEVICE_CLASS_CO2 or DEVICE_CLASS_CO2 in state.entity_id:
            a_type = "CarbonDioxideSensor"
        elif device_class == DEVICE_CLASS_ILLUMINANCE or unit in ("lm", "lx"):
            a_type = "LightSensor"

    elif state.domain == "switch":
        switch_type = config.get(CONF_TYPE, TYPE_SWITCH)
        a_type = SWITCH_TYPES[switch_type]

    elif state.domain in ("automation", "input_boolean", "remote", "scene", "script"):
        a_type = "Switch"

    elif state.domain == "water_heater":
        a_type = "WaterHeater"

    if a_type is None:
        return None

    _LOGGER.debug('Add "%s" as "%s"', state.entity_id, a_type)
    return TYPES[a_type](hass, driver, name, state.entity_id, aid, config)


def generate_aid(entity_id):
    """Generate accessory aid with zlib adler32."""
    aid = adler32(entity_id.encode("utf-8"))
    if aid in (0, 1):
        return None
    return aid


class HomeKit:
    """Class to handle all actions between HomeKit and Home Assistant."""

    def __init__(
        self, hass, name, port, ip_address, entity_filter, entity_config, safe_mode
    ):
        """Initialize a HomeKit object."""
        self.hass = hass
        self._name = name
        self._port = port
        self._ip_address = ip_address
        self._filter = entity_filter
        self._config = entity_config
        self._safe_mode = safe_mode
        self.status = STATUS_READY

        self.bridge = None
        self.driver = None

    def setup(self):
        """Set up bridge and accessory driver."""
        from .accessories import HomeBridge, HomeDriver

        self.hass.bus.async_listen_once(EVENT_HOMEASSISTANT_STOP, self.stop)

        ip_addr = self._ip_address or get_local_ip()
        path = self.hass.config.path(HOMEKIT_FILE)
        self.driver = HomeDriver(
            self.hass, address=ip_addr, port=self._port, persist_file=path
        )
        self.bridge = HomeBridge(self.hass, self.driver, self._name)
        if self._safe_mode:
            _LOGGER.debug("Safe_mode selected")
            self.driver.safe_mode = True

    def reset_accessories(self, entity_ids):
        """Reset the accessory to load the latest configuration."""
        removed = []
        for entity_id in entity_ids:
            aid = generate_aid(entity_id)
            if aid not in self.bridge.accessories:
                _LOGGER.warning(
                    "Could not reset accessory. entity_id " "not found %s", entity_id
                )
                continue
            acc = self.remove_bridge_accessory(aid)
            removed.append(acc)
        self.driver.config_changed()

        for acc in removed:
            self.bridge.add_accessory(acc)
        self.driver.config_changed()

    def add_bridge_accessory(self, state):
        """Try adding accessory to bridge if configured beforehand."""
        if not state or not self._filter(state.entity_id):
            return
        aid = generate_aid(state.entity_id)
        conf = self._config.pop(state.entity_id, {})
        acc = get_accessory(self.hass, self.driver, state, aid, conf)
        if acc is not None:
            self.bridge.add_accessory(acc)

    def remove_bridge_accessory(self, aid):
        """Try adding accessory to bridge if configured beforehand."""
        acc = None
        if aid in self.bridge.accessories:
            acc = self.bridge.accessories.pop(aid)
        return acc

    def start(self, *args):
        """Start the accessory driver."""
        if self.status != STATUS_READY:
            return
        self.status = STATUS_WAIT

        # pylint: disable=unused-import
        from . import (  # noqa F401
            type_covers,
            type_fans,
            type_lights,
            type_locks,
            type_media_players,
            type_security_systems,
            type_sensors,
            type_switches,
            type_thermostats,
        )

        for state in self.hass.states.all():
            self.add_bridge_accessory(state)
        self.driver.add_accessory(self.bridge)

        if not self.driver.state.paired:
            show_setup_message(self.hass, self.driver.state.pincode)

        if len(self.bridge.accessories) > MAX_DEVICES:
            _LOGGER.warning(
                "You have exceeded the device limit, which might "
                "cause issues. Consider using the filter option."
            )

        _LOGGER.debug("Driver start")
        self.hass.add_job(self.driver.start)
        self.status = STATUS_RUNNING

    def stop(self, *args):
        """Stop the accessory driver."""
        if self.status != STATUS_RUNNING:
            return
        self.status = STATUS_STOPPED

        _LOGGER.debug("Driver stop")
        self.hass.add_job(self.driver.stop)
