"""
homeassistant.components.thermostat.honeywell
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Adds support for Honeywell Round Connected and Honeywell Evohome thermostats.

For more details about this platform, please refer to the documentation at
https://home-assistant.io/components/thermostat.honeywell/
"""
import logging
import socket

from homeassistant.components.thermostat import ThermostatDevice
from homeassistant.const import (CONF_USERNAME, CONF_PASSWORD, TEMP_CELCIUS,
                                 TEMP_FAHRENHEIT)

REQUIREMENTS = ['evohomeclient==0.2.4',
                'somecomfort==0.2.0']

_LOGGER = logging.getLogger(__name__)

CONF_AWAY_TEMP = "away_temperature"
DEFAULT_AWAY_TEMP = 16


def _setup_round(username, password, config, add_devices):
    from evohomeclient import EvohomeClient

    try:
        away_temp = float(config.get(CONF_AWAY_TEMP, DEFAULT_AWAY_TEMP))
    except ValueError:
        _LOGGER.error("value entered for item %s should convert to a number",
                      CONF_AWAY_TEMP)
        return False

    evo_api = EvohomeClient(username, password)

    try:
        zones = evo_api.temperatures(force_refresh=True)
        for i, zone in enumerate(zones):
            add_devices([RoundThermostat(evo_api,
                                         zone['id'],
                                         i == 0,
                                         away_temp)])
    except socket.error:
        _LOGGER.error(
            "Connection error logging into the honeywell evohome web service"
        )
        return False
    return True


# config will be used later
# pylint: disable=unused-argument
def _setup_us(username, password, config, add_devices):
    import somecomfort

    try:
        client = somecomfort.SomeComfort(username, password)
    except somecomfort.AuthError:
        _LOGGER.error('Failed to login to honeywell account %s', username)
        return False
    except somecomfort.SomeComfortError as ex:
        _LOGGER.error('Failed to initialize honeywell client: %s', str(ex))
        return False

    dev_id = config.get('thermostat')
    loc_id = config.get('location')

    add_devices([HoneywellUSThermostat(client, device)
                 for location in client.locations_by_id.values()
                 for device in location.devices_by_id.values()
                 if ((not loc_id or location.locationid == loc_id) and
                     (not dev_id or device.deviceid == dev_id))])
    return True


# pylint: disable=unused-argument
def setup_platform(hass, config, add_devices, discovery_info=None):
    """ Sets up the honeywel thermostat. """
    username = config.get(CONF_USERNAME)
    password = config.get(CONF_PASSWORD)
    region = config.get('region', 'eu').lower()

    if username is None or password is None:
        _LOGGER.error("Missing required configuration items %s or %s",
                      CONF_USERNAME, CONF_PASSWORD)
        return False
    if region not in ('us', 'eu'):
        _LOGGER.error('Region `%s` is invalid (use either us or eu)', region)
        return False

    if region == 'us':
        return _setup_us(username, password, config, add_devices)
    else:
        return _setup_round(username, password, config, add_devices)


class RoundThermostat(ThermostatDevice):
    """ Represents a Honeywell Round Connected thermostat. """

    # pylint: disable=too-many-instance-attributes
    def __init__(self, device, zone_id, master, away_temp):
        self.device = device
        self._current_temperature = None
        self._target_temperature = None
        self._name = "round connected"
        self._id = zone_id
        self._master = master
        self._is_dhw = False
        self._away_temp = away_temp
        self._away = False
        self.update()

    @property
    def name(self):
        """ Returns the name of the honeywell, if any. """
        return self._name

    @property
    def unit_of_measurement(self):
        """ Unit of measurement this thermostat expresses itself in. """
        return TEMP_CELCIUS

    @property
    def current_temperature(self):
        """ Returns the current temperature. """
        return self._current_temperature

    @property
    def target_temperature(self):
        """ Returns the temperature we try to reach. """
        if self._is_dhw:
            return None
        return self._target_temperature

    def set_temperature(self, temperature):
        """ Set new target temperature """
        self.device.set_temperature(self._name, temperature)

    @property
    def is_away_mode_on(self):
        """ Returns if away mode is on. """
        return self._away

    def turn_away_mode_on(self):
        """ Turns away on.
         Evohome does have a proprietary away mode, but it doesn't really work
         the way it should. For example: If you set a temperature manually
         it doesn't get overwritten when away mode is switched on.
         """
        self._away = True
        self.device.set_temperature(self._name, self._away_temp)

    def turn_away_mode_off(self):
        """ Turns away off. """
        self._away = False
        self.device.cancel_temp_override(self._name)

    def update(self):
        try:
            # Only refresh if this is the "master" device,
            # others will pick up the cache
            for val in self.device.temperatures(force_refresh=self._master):
                if val['id'] == self._id:
                    data = val

        except StopIteration:
            _LOGGER.error("Did not receive any temperature data from the "
                          "evohomeclient API.")
            return

        self._current_temperature = data['temp']
        self._target_temperature = data['setpoint']
        if data['thermostat'] == "DOMESTIC_HOT_WATER":
            self._name = "Hot Water"
            self._is_dhw = True
        else:
            self._name = data['name']
            self._is_dhw = False


class HoneywellUSThermostat(ThermostatDevice):
    """ Represents a Honeywell US Thermostat. """

    def __init__(self, client, device):
        self._client = client
        self._device = device

    @property
    def is_fan_on(self):
        return self._device.fan_running

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

    @property
    def unit_of_measurement(self):
        return (TEMP_CELCIUS if self._device.temperature_unit == 'C'
                else TEMP_FAHRENHEIT)

    @property
    def current_temperature(self):
        self._device.refresh()
        return self._device.current_temperature

    @property
    def target_temperature(self):
        if self._device.system_mode == 'cool':
            return self._device.setpoint_cool
        else:
            return self._device.setpoint_heat

    def set_temperature(self, temperature):
        """ Set target temperature. """
        import somecomfort
        try:
            if self._device.system_mode == 'cool':
                self._device.setpoint_cool = temperature
            else:
                self._device.setpoint_heat = temperature
        except somecomfort.SomeComfortError:
            _LOGGER.error('Temperature %.1f out of range', temperature)

    @property
    def device_state_attributes(self):
        """ Return device specific state attributes. """
        return {'fan': (self.is_fan_on and 'running' or 'idle'),
                'fanmode': self._device.fan_mode,
                'system_mode': self._device.system_mode}

    def turn_away_mode_on(self):
        pass

    def turn_away_mode_off(self):
        pass