"""Support for LCN switches."""
from homeassistant.components.lcn import (
    CONF_CONNECTIONS, CONF_OUTPUT, DATA_LCN, OUTPUT_PORTS, LcnDevice,
    get_connection)
from homeassistant.components.switch import SwitchDevice
from homeassistant.const import CONF_ADDRESS

DEPENDENCIES = ['lcn']


async def async_setup_platform(hass, hass_config, async_add_entities,
                               discovery_info=None):
    """Set up the LCN switch platform."""
    if discovery_info is None:
        return

    import pypck

    devices = []
    for config in discovery_info:
        address, connection_id = config[CONF_ADDRESS]
        addr = pypck.lcn_addr.LcnAddr(*address)
        connections = hass.data[DATA_LCN][CONF_CONNECTIONS]
        connection = get_connection(connections, connection_id)
        address_connection = connection.get_address_conn(addr)

        if config[CONF_OUTPUT] in OUTPUT_PORTS:
            device = LcnOutputSwitch(config, address_connection)
        else:  # in RELAY_PORTS
            device = LcnRelaySwitch(config, address_connection)

        devices.append(device)

    async_add_entities(devices)


class LcnOutputSwitch(LcnDevice, SwitchDevice):
    """Representation of a LCN switch for output ports."""

    def __init__(self, config, address_connection):
        """Initialize the LCN switch."""
        super().__init__(config, address_connection)

        self.output = self.pypck.lcn_defs.OutputPort[config[CONF_OUTPUT]]

        self._is_on = None

    async def async_added_to_hass(self):
        """Run when entity about to be added to hass."""
        await super().async_added_to_hass()
        self.hass.async_create_task(
            self.address_connection.activate_status_request_handler(
                self.output))

    @property
    def is_on(self):
        """Return True if entity is on."""
        return self._is_on

    async def async_turn_on(self, **kwargs):
        """Turn the entity on."""
        self._is_on = True
        self.address_connection.dim_output(self.output.value, 100, 0)
        await self.async_update_ha_state()

    async def async_turn_off(self, **kwargs):
        """Turn the entity off."""
        self._is_on = False
        self.address_connection.dim_output(self.output.value, 0, 0)
        await self.async_update_ha_state()

    def input_received(self, input_obj):
        """Set switch state when LCN input object (command) is received."""
        if not isinstance(input_obj, self.pypck.inputs.ModStatusOutput) or \
                input_obj.get_output_id() != self.output.value:
            return

        self._is_on = input_obj.get_percent() > 0
        self.async_schedule_update_ha_state()


class LcnRelaySwitch(LcnDevice, SwitchDevice):
    """Representation of a LCN switch for relay ports."""

    def __init__(self, config, address_connection):
        """Initialize the LCN switch."""
        super().__init__(config, address_connection)

        self.output = self.pypck.lcn_defs.RelayPort[config[CONF_OUTPUT]]

        self._is_on = None

    async def async_added_to_hass(self):
        """Run when entity about to be added to hass."""
        await super().async_added_to_hass()
        self.hass.async_create_task(
            self.address_connection.activate_status_request_handler(
                self.output))

    @property
    def is_on(self):
        """Return True if entity is on."""
        return self._is_on

    async def async_turn_on(self, **kwargs):
        """Turn the entity on."""
        self._is_on = True

        states = [self.pypck.lcn_defs.RelayStateModifier.NOCHANGE] * 8
        states[self.output.value] = self.pypck.lcn_defs.RelayStateModifier.ON
        self.address_connection.control_relays(states)
        await self.async_update_ha_state()

    async def async_turn_off(self, **kwargs):
        """Turn the entity off."""
        self._is_on = False

        states = [self.pypck.lcn_defs.RelayStateModifier.NOCHANGE] * 8
        states[self.output.value] = self.pypck.lcn_defs.RelayStateModifier.OFF
        self.address_connection.control_relays(states)
        await self.async_update_ha_state()

    def input_received(self, input_obj):
        """Set switch state when LCN input object (command) is received."""
        if not isinstance(input_obj, self.pypck.inputs.ModStatusRelays):
            return

        self._is_on = input_obj.get_state(self.output.value)
        self.async_schedule_update_ha_state()