"""Support for Xiaomi Mi WiFi Repeater 2."""
import logging

from miio import DeviceException, WifiRepeater  # pylint: disable=import-error
import voluptuous as vol

from homeassistant.components.device_tracker import (
    DOMAIN,
    PLATFORM_SCHEMA,
    DeviceScanner,
)
from homeassistant.const import CONF_HOST, CONF_TOKEN
import homeassistant.helpers.config_validation as cv

_LOGGER = logging.getLogger(__name__)

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
    {
        vol.Required(CONF_HOST): cv.string,
        vol.Required(CONF_TOKEN): vol.All(cv.string, vol.Length(min=32, max=32)),
    }
)


def get_scanner(hass, config):
    """Return a Xiaomi MiIO device scanner."""
    scanner = None
    host = config[DOMAIN][CONF_HOST]
    token = config[DOMAIN][CONF_TOKEN]

    _LOGGER.info("Initializing with host %s (token %s...)", host, token[:5])

    try:
        device = WifiRepeater(host, token)
        device_info = device.info()
        _LOGGER.info(
            "%s %s %s detected",
            device_info.model,
            device_info.firmware_version,
            device_info.hardware_version,
        )
        scanner = XiaomiMiioDeviceScanner(device)
    except DeviceException as ex:
        _LOGGER.error("Device unavailable or token incorrect: %s", ex)

    return scanner


class XiaomiMiioDeviceScanner(DeviceScanner):
    """This class queries a Xiaomi Mi WiFi Repeater."""

    def __init__(self, device):
        """Initialize the scanner."""
        self.device = device

    async def async_scan_devices(self):
        """Scan for devices and return a list containing found device IDs."""
        devices = []
        try:
            station_info = await self.hass.async_add_executor_job(self.device.status)
            _LOGGER.debug("Got new station info: %s", station_info)

            for device in station_info.associated_stations:
                devices.append(device["mac"])

        except DeviceException as ex:
            _LOGGER.error("Unable to fetch the state: %s", ex)

        return devices

    async def async_get_device_name(self, device):
        """Return None.

        The repeater doesn't provide the name of the associated device.
        """
        return None