"""
Demo platform that has two fake switches.

For more details about this platform, please refer to the documentation
https://home-assistant.io/components/demo/
"""
from homeassistant.components.switch import SwitchDevice
from homeassistant.const import DEVICE_DEFAULT_NAME


def setup_platform(hass, config, add_devices_callback, discovery_info=None):
    """Set up the demo switches."""
    add_devices_callback([
        DemoSwitch('Decorative Lights', True, None, True),
        DemoSwitch('AC', False, 'mdi:air-conditioner', False)
    ])


class DemoSwitch(SwitchDevice):
    """Representation of a demo switch."""

    def __init__(self, name, state, icon, assumed):
        """Initialize the Demo switch."""
        self._name = name or DEVICE_DEFAULT_NAME
        self._state = state
        self._icon = icon
        self._assumed = assumed

    @property
    def should_poll(self):
        """No polling needed for a demo switch."""
        return False

    @property
    def name(self):
        """Return the name of the device if any."""
        return self._name

    @property
    def icon(self):
        """Return the icon to use for device if any."""
        return self._icon

    @property
    def assumed_state(self):
        """Return if the state is based on assumptions."""
        return self._assumed

    @property
    def current_power_w(self):
        """Return the current power usage in W."""
        if self._state:
            return 100

    @property
    def today_energy_kwh(self):
        """Return the today total energy usage in kWh."""
        return 15

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

    def turn_on(self, **kwargs):
        """Turn the switch on."""
        self._state = True
        self.schedule_update_ha_state()

    def turn_off(self, **kwargs):
        """Turn the device off."""
        self._state = False
        self.schedule_update_ha_state()