"""Support for showing random states."""
from random import getrandbits

import voluptuous as vol

from homeassistant.components.binary_sensor import (
    DEVICE_CLASSES_SCHEMA,
    PLATFORM_SCHEMA,
    BinarySensorEntity,
)
from homeassistant.const import CONF_DEVICE_CLASS, CONF_NAME
import homeassistant.helpers.config_validation as cv

DEFAULT_NAME = "Random Binary Sensor"

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
    {
        vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
        vol.Optional(CONF_DEVICE_CLASS): DEVICE_CLASSES_SCHEMA,
    }
)


async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
    """Set up the Random binary sensor."""
    name = config.get(CONF_NAME)
    device_class = config.get(CONF_DEVICE_CLASS)

    async_add_entities([RandomSensor(name, device_class)], True)


class RandomSensor(BinarySensorEntity):
    """Representation of a Random binary sensor."""

    def __init__(self, name, device_class):
        """Initialize the Random binary sensor."""
        self._name = name
        self._device_class = device_class
        self._state = None

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

    @property
    def is_on(self):
        """Return true if sensor is on."""
        return self._state

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

    async def async_update(self):
        """Get new state and update the sensor's state."""

        self._state = bool(getrandbits(1))