"""Support for Velbus switches."""
import logging

from velbus.util import VelbusException

from homeassistant.components.switch import SwitchDevice

from . import VelbusEntity
from .const import DOMAIN

_LOGGER = logging.getLogger(__name__)


async def async_setup_entry(hass, entry, async_add_entities):
    """Set up Velbus switch based on config_entry."""
    cntrl = hass.data[DOMAIN][entry.entry_id]["cntrl"]
    modules_data = hass.data[DOMAIN][entry.entry_id]["switch"]
    entities = []
    for address, channel in modules_data:
        module = cntrl.get_module(address)
        entities.append(VelbusSwitch(module, channel))
    async_add_entities(entities)


class VelbusSwitch(VelbusEntity, SwitchDevice):
    """Representation of a switch."""

    @property
    def is_on(self):
        """Return true if the switch is on."""
        return self._module.is_on(self._channel)

    def turn_on(self, **kwargs):
        """Instruct the switch to turn on."""
        try:
            self._module.turn_on(self._channel)
        except VelbusException as err:
            _LOGGER.error("A Velbus error occurred: %s", err)

    def turn_off(self, **kwargs):
        """Instruct the switch to turn off."""
        try:
            self._module.turn_off(self._channel)
        except VelbusException as err:
            _LOGGER.error("A Velbus error occurred: %s", err)