"""
Support for exposing Concord232 elements as sensors.

For more details about this platform, please refer to the documentation at
https://home-assistant.io/components/binary_sensor.concord232/
"""
import datetime
import logging

import requests
import voluptuous as vol

from homeassistant.components.binary_sensor import (
    BinarySensorDevice,
    PLATFORM_SCHEMA,
    DEVICE_CLASSES,
)
from homeassistant.const import CONF_HOST, CONF_PORT
import homeassistant.helpers.config_validation as cv

REQUIREMENTS = ["concord232==0.15"]

_LOGGER = logging.getLogger(__name__)

CONF_EXCLUDE_ZONES = "exclude_zones"
CONF_ZONE_TYPES = "zone_types"

DEFAULT_HOST = "localhost"
DEFAULT_NAME = "Alarm"
DEFAULT_PORT = "5007"
DEFAULT_SSL = False

SCAN_INTERVAL = datetime.timedelta(seconds=10)

ZONE_TYPES_SCHEMA = vol.Schema({cv.positive_int: vol.In(DEVICE_CLASSES)})

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
    {
        vol.Optional(CONF_EXCLUDE_ZONES, default=[]): vol.All(
            cv.ensure_list, [cv.positive_int]
        ),
        vol.Optional(CONF_HOST, default=DEFAULT_HOST): cv.string,
        vol.Optional(CONF_PORT, default=DEFAULT_PORT): cv.port,
        vol.Optional(CONF_ZONE_TYPES, default={}): ZONE_TYPES_SCHEMA,
    }
)


def setup_platform(hass, config, add_entities, discovery_info=None):
    """Set up the Concord232 binary sensor platform."""
    from concord232 import client as concord232_client

    host = config.get(CONF_HOST)
    port = config.get(CONF_PORT)
    exclude = config.get(CONF_EXCLUDE_ZONES)
    zone_types = config.get(CONF_ZONE_TYPES)
    sensors = []

    try:
        _LOGGER.debug("Initializing client")
        client = concord232_client.Client("http://{}:{}".format(host, port))
        client.zones = client.list_zones()
        client.last_zone_update = datetime.datetime.now()

    except requests.exceptions.ConnectionError as ex:
        _LOGGER.error("Unable to connect to Concord232: %s", str(ex))
        return False

    # The order of zones returned by client.list_zones() can vary.
    # When the zones are not named, this can result in the same entity
    # name mapping to different sensors in an unpredictable way.  Sort
    # the zones by zone number to prevent this.

    client.zones.sort(key=lambda zone: zone["number"])

    for zone in client.zones:
        _LOGGER.info("Loading Zone found: %s", zone["name"])
        if zone["number"] not in exclude:
            sensors.append(
                Concord232ZoneSensor(
                    hass,
                    client,
                    zone,
                    zone_types.get(zone["number"], get_opening_type(zone)),
                )
            )

        add_entities(sensors, True)


def get_opening_type(zone):
    """Return the result of the type guessing from name."""
    if "MOTION" in zone["name"]:
        return "motion"
    if "KEY" in zone["name"]:
        return "safety"
    if "SMOKE" in zone["name"]:
        return "smoke"
    if "WATER" in zone["name"]:
        return "water"
    return "opening"


class Concord232ZoneSensor(BinarySensorDevice):
    """Representation of a Concord232 zone as a sensor."""

    def __init__(self, hass, client, zone, zone_type):
        """Initialize the Concord232 binary sensor."""
        self._hass = hass
        self._client = client
        self._zone = zone
        self._number = zone["number"]
        self._zone_type = zone_type

    @property
    def device_class(self):
        """Return the class of this sensor, from DEVICE_CLASSES."""
        return self._zone_type

    @property
    def should_poll(self):
        """No polling needed."""
        return True

    @property
    def name(self):
        """Return the name of the binary sensor."""
        return self._zone["name"]

    @property
    def is_on(self):
        """Return true if the binary sensor is on."""
        # True means "faulted" or "open" or "abnormal state"
        return bool(self._zone["state"] != "Normal")

    def update(self):
        """Get updated stats from API."""
        last_update = datetime.datetime.now() - self._client.last_zone_update
        _LOGGER.debug("Zone: %s ", self._zone)
        if last_update > datetime.timedelta(seconds=1):
            self._client.zones = self._client.list_zones()
            self._client.last_zone_update = datetime.datetime.now()
            _LOGGER.debug("Updated from zone: %s", self._zone["name"])

        if hasattr(self._client, "zones"):
            self._zone = next(
                (x for x in self._client.zones if x["number"] == self._number), None
            )