"""Support for ADS light sources."""
import logging

import voluptuous as vol

from homeassistant.components.light import (
    ATTR_BRIGHTNESS, PLATFORM_SCHEMA, SUPPORT_BRIGHTNESS, Light)
from homeassistant.const import CONF_NAME
import homeassistant.helpers.config_validation as cv

from . import CONF_ADS_VAR, CONF_ADS_VAR_BRIGHTNESS, DATA_ADS, \
    AdsEntity, STATE_KEY_BRIGHTNESS, STATE_KEY_STATE

_LOGGER = logging.getLogger(__name__)
DEFAULT_NAME = 'ADS Light'
PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
    vol.Required(CONF_ADS_VAR): cv.string,
    vol.Optional(CONF_ADS_VAR_BRIGHTNESS): cv.string,
    vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string
})


def setup_platform(hass, config, add_entities, discovery_info=None):
    """Set up the light platform for ADS."""
    ads_hub = hass.data.get(DATA_ADS)

    ads_var_enable = config.get(CONF_ADS_VAR)
    ads_var_brightness = config.get(CONF_ADS_VAR_BRIGHTNESS)
    name = config.get(CONF_NAME)

    add_entities([AdsLight(ads_hub, ads_var_enable, ads_var_brightness,
                           name)])


class AdsLight(AdsEntity, Light):
    """Representation of ADS light."""

    def __init__(self, ads_hub, ads_var_enable, ads_var_brightness, name):
        """Initialize AdsLight entity."""
        super().__init__(ads_hub, name, ads_var_enable)
        self._state_dict[STATE_KEY_BRIGHTNESS] = None
        self._ads_var_brightness = ads_var_brightness

    async def async_added_to_hass(self):
        """Register device notification."""
        await self.async_initialize_device(self._ads_var,
                                           self._ads_hub.PLCTYPE_BOOL)

        if self._ads_var_brightness is not None:
            await self.async_initialize_device(self._ads_var_brightness,
                                               self._ads_hub.PLCTYPE_UINT,
                                               STATE_KEY_BRIGHTNESS)

    @property
    def brightness(self):
        """Return the brightness of the light (0..255)."""
        return self._state_dict[STATE_KEY_BRIGHTNESS]

    @property
    def supported_features(self):
        """Flag supported features."""
        support = 0
        if self._ads_var_brightness is not None:
            support = SUPPORT_BRIGHTNESS
        return support

    @property
    def is_on(self):
        """Return True if the entity is on."""
        return self._state_dict[STATE_KEY_STATE]

    def turn_on(self, **kwargs):
        """Turn the light on or set a specific dimmer value."""
        brightness = kwargs.get(ATTR_BRIGHTNESS)
        self._ads_hub.write_by_name(self._ads_var, True,
                                    self._ads_hub.PLCTYPE_BOOL)

        if self._ads_var_brightness is not None and brightness is not None:
            self._ads_hub.write_by_name(self._ads_var_brightness, brightness,
                                        self._ads_hub.PLCTYPE_UINT)

    def turn_off(self, **kwargs):
        """Turn the light off."""
        self._ads_hub.write_by_name(self._ads_var, False,
                                    self._ads_hub.PLCTYPE_BOOL)
