"""
homeassistant.components.switch.transmission
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Enable or disable Transmission BitTorrent client Turtle Mode

Configuration:

To use the Transmission switch you will need to add something like the
following to your config/configuration.yaml

switch:
    platform: transmission
    name: Transmission
    host: 192.168.1.26
    port: 9091
    username: YOUR_USERNAME
    password: YOUR_PASSWORD

Variables:

host
*Required
This is the IP address of your Transmission daemon. Example: 192.168.1.32

port
*Optional
The port your Transmission daemon uses, defaults to 9091. Example: 8080

username
*Optional
Your Transmission username, if you use authentication

password
*Optional
Your Transmission username, if you use authentication

name
*Optional
The name to use when displaying this Transmission instance.


"""

from homeassistant.const import CONF_HOST, CONF_USERNAME, CONF_PASSWORD
from homeassistant.const import STATE_ON, STATE_OFF

from homeassistant.helpers.entity import ToggleEntity
# pylint: disable=no-name-in-module, import-error
import transmissionrpc

from transmissionrpc.error import TransmissionError

import logging

_LOGGING = logging.getLogger(__name__)


# pylint: disable=unused-argument
def setup_platform(hass, config, add_devices_callback, discovery_info=None):
    """ Sets up the sensors. """
    host = config.get(CONF_HOST)
    username = config.get(CONF_USERNAME, None)
    password = config.get(CONF_PASSWORD, None)
    port = config.get('port', 9091)

    name = config.get("name", "Transmission Turtle Mode")
    if not host:
        _LOGGING.error('Missing config variable %s', CONF_HOST)
        return False

    # import logging
    # logging.getLogger('transmissionrpc').setLevel(logging.DEBUG)

    transmission_api = transmissionrpc.Client(
        host, port=port, user=username, password=password)
    try:
        transmission_api.session_stats()
    except TransmissionError:
        _LOGGING.exception("Connection to Transmission API failed.")
        return False

    add_devices_callback([
        TransmissionSwitch(transmission_api, name)
    ])


class TransmissionSwitch(ToggleEntity):

    """ A Transmission sensor. """

    def __init__(self, transmission_client, name):
        self._name = name
        self.transmission_client = transmission_client
        self._state = STATE_OFF

    @property
    def name(self):
        return self._name

    @property
    def state(self):
        """ Returns the state of the device. """
        return self._state

    @property
    def should_poll(self):
        """ Poll for status regularly. """
        return True

    @property
    def is_on(self):
        """ True if device is on. """
        return self._state == STATE_ON

    def turn_on(self, **kwargs):
        """ Turn the device on. """

        _LOGGING.info("Turning on Turtle Mode")
        self.transmission_client.set_session(
            alt_speed_enabled=True)

    def turn_off(self, **kwargs):
        """ Turn the device off. """

        _LOGGING.info("Turning off Turtle Mode ")
        self.transmission_client.set_session(
            alt_speed_enabled=False)

    def update(self):
        """ Gets the latest data from Transmission and updates the state. """

        active = self.transmission_client.get_session(
        ).alt_speed_enabled
        self._state = STATE_ON if active else STATE_OFF