"""
Support for Wink water heaters.

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

from homeassistant.components.water_heater import (
    ATTR_TEMPERATURE, STATE_ECO, STATE_ELECTRIC,
    STATE_PERFORMANCE, SUPPORT_AWAY_MODE, STATE_HEAT_PUMP,
    STATE_GAS, STATE_HIGH_DEMAND,
    SUPPORT_OPERATION_MODE, SUPPORT_TARGET_TEMPERATURE,
    WaterHeaterDevice)
from homeassistant.components.wink import DOMAIN, WinkDevice
from homeassistant.const import (
    STATE_OFF, STATE_UNKNOWN, TEMP_CELSIUS)

_LOGGER = logging.getLogger(__name__)

SUPPORT_FLAGS_HEATER = (SUPPORT_TARGET_TEMPERATURE | SUPPORT_OPERATION_MODE |
                        SUPPORT_AWAY_MODE)

ATTR_RHEEM_TYPE = 'rheem_type'
ATTR_VACATION_MODE = 'vacation_mode'

HA_STATE_TO_WINK = {
    STATE_ECO: 'eco',
    STATE_ELECTRIC: 'electric_only',
    STATE_GAS: 'gas',
    STATE_HEAT_PUMP: 'heat_pump',
    STATE_HIGH_DEMAND: 'high_demand',
    STATE_OFF: 'off',
    STATE_PERFORMANCE: 'performance',
}

WINK_STATE_TO_HA = {value: key for key, value in HA_STATE_TO_WINK.items()}


def setup_platform(hass, config, add_entities, discovery_info=None):
    """Set up the Wink water heater devices."""
    import pywink
    for water_heater in pywink.get_water_heaters():
        _id = water_heater.object_id() + water_heater.name()
        if _id not in hass.data[DOMAIN]['unique_ids']:
            add_entities([WinkWaterHeater(water_heater, hass)])


class WinkWaterHeater(WinkDevice, WaterHeaterDevice):
    """Representation of a Wink water heater."""

    @property
    def supported_features(self):
        """Return the list of supported features."""
        return SUPPORT_FLAGS_HEATER

    @property
    def temperature_unit(self):
        """Return the unit of measurement."""
        # The Wink API always returns temp in Celsius
        return TEMP_CELSIUS

    @property
    def device_state_attributes(self):
        """Return the optional device state attributes."""
        data = {}
        data[ATTR_VACATION_MODE] = self.wink.vacation_mode_enabled()
        data[ATTR_RHEEM_TYPE] = self.wink.rheem_type()

        return data

    @property
    def current_operation(self):
        """
        Return current operation one of the following.

        ["eco", "performance", "heat_pump",
        "high_demand", "electric_only", "gas]
        """
        if not self.wink.is_on():
            current_op = STATE_OFF
        else:
            current_op = WINK_STATE_TO_HA.get(self.wink.current_mode())
            if current_op is None:
                current_op = STATE_UNKNOWN
        return current_op

    @property
    def operation_list(self):
        """List of available operation modes."""
        op_list = ['off']
        modes = self.wink.modes()
        for mode in modes:
            if mode == 'aux':
                continue
            ha_mode = WINK_STATE_TO_HA.get(mode)
            if ha_mode is not None:
                op_list.append(ha_mode)
            else:
                error = "Invalid operation mode mapping. " + mode + \
                    " doesn't map. Please report this."
                _LOGGER.error(error)
        return op_list

    def set_temperature(self, **kwargs):
        """Set new target temperature."""
        target_temp = kwargs.get(ATTR_TEMPERATURE)
        self.wink.set_temperature(target_temp)

    def set_operation_mode(self, operation_mode):
        """Set operation mode."""
        op_mode_to_set = HA_STATE_TO_WINK.get(operation_mode)
        self.wink.set_operation_mode(op_mode_to_set)

    @property
    def target_temperature(self):
        """Return the temperature we try to reach."""
        return self.wink.current_set_point()

    def turn_away_mode_on(self):
        """Turn away on."""
        self.wink.set_vacation_mode(True)

    def turn_away_mode_off(self):
        """Turn away off."""
        self.wink.set_vacation_mode(False)

    @property
    def min_temp(self):
        """Return the minimum temperature."""
        return self.wink.min_set_point()

    @property
    def max_temp(self):
        """Return the maximum temperature."""
        return self.wink.max_set_point()
