"""Support for binary sensors through the SmartThings cloud API."""
from typing import Optional, Sequence

from homeassistant.components.binary_sensor import BinarySensorDevice

from . import SmartThingsEntity
from .const import DATA_BROKERS, DOMAIN

DEPENDENCIES = ['smartthings']

CAPABILITY_TO_ATTRIB = {
    'accelerationSensor': 'acceleration',
    'contactSensor': 'contact',
    'filterStatus': 'filterStatus',
    'motionSensor': 'motion',
    'presenceSensor': 'presence',
    'soundSensor': 'sound',
    'tamperAlert': 'tamper',
    'valve': 'valve',
    'waterSensor': 'water',
}
ATTRIB_TO_CLASS = {
    'acceleration': 'moving',
    'contact': 'opening',
    'filterStatus': 'problem',
    'motion': 'motion',
    'presence': 'presence',
    'sound': 'sound',
    'tamper': 'problem',
    'valve': 'opening',
    'water': 'moisture',
}


async def async_setup_platform(hass, config, async_add_entities,
                               discovery_info=None):
    """Platform uses config entry setup."""
    pass


async def async_setup_entry(hass, config_entry, async_add_entities):
    """Add binary sensors for a config entry."""
    broker = hass.data[DOMAIN][DATA_BROKERS][config_entry.entry_id]
    sensors = []
    for device in broker.devices.values():
        for capability in broker.get_assigned(
                device.device_id, 'binary_sensor'):
            attrib = CAPABILITY_TO_ATTRIB[capability]
            sensors.append(SmartThingsBinarySensor(device, attrib))
    async_add_entities(sensors)


def get_capabilities(capabilities: Sequence[str]) -> Optional[Sequence[str]]:
    """Return all capabilities supported if minimum required are present."""
    return [capability for capability in CAPABILITY_TO_ATTRIB
            if capability in capabilities]


class SmartThingsBinarySensor(SmartThingsEntity, BinarySensorDevice):
    """Define a SmartThings Binary Sensor."""

    def __init__(self, device, attribute):
        """Init the class."""
        super().__init__(device)
        self._attribute = attribute

    @property
    def name(self) -> str:
        """Return the name of the binary sensor."""
        return '{} {}'.format(self._device.label, self._attribute)

    @property
    def unique_id(self) -> str:
        """Return a unique ID."""
        return '{}.{}'.format(self._device.device_id, self._attribute)

    @property
    def is_on(self):
        """Return true if the binary sensor is on."""
        return self._device.status.is_on(self._attribute)

    @property
    def device_class(self):
        """Return the class of this device."""
        return ATTRIB_TO_CLASS[self._attribute]