"""Support for the Yahoo! Weather service."""
from datetime import timedelta
import logging

import voluptuous as vol
from yahooweather import (  # pylint: disable=import-error
    UNIT_C,
    UNIT_F,
    YahooWeather,
    get_woeid,
)

from homeassistant.components.sensor import PLATFORM_SCHEMA
from homeassistant.const import (
    ATTR_ATTRIBUTION,
    CONF_MONITORED_CONDITIONS,
    CONF_NAME,
    TEMP_CELSIUS,
    UNIT_PERCENTAGE,
)
import homeassistant.helpers.config_validation as cv
from homeassistant.helpers.entity import Entity
from homeassistant.util import Throttle

_LOGGER = logging.getLogger(__name__)

ATTRIBUTION = "Weather details provided by Yahoo! Inc."

CONF_FORECAST = "forecast"

CONF_WOEID = "woeid"

DEFAULT_NAME = "Yweather"

MIN_TIME_BETWEEN_UPDATES = timedelta(minutes=10)

SENSOR_TYPES = {
    "weather_current": ["Current", None],
    "weather": ["Condition", None],
    "temperature": ["Temperature", "temperature"],
    "temp_min": ["Temperature min", "temperature"],
    "temp_max": ["Temperature max", "temperature"],
    "wind_speed": ["Wind speed", "speed"],
    "humidity": ["Humidity", UNIT_PERCENTAGE],
    "pressure": ["Pressure", "pressure"],
    "visibility": ["Visibility", "distance"],
}

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
    {
        vol.Optional(CONF_WOEID): cv.string,
        vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
        vol.Optional(CONF_FORECAST, default=0): vol.All(
            vol.Coerce(int), vol.Range(min=0, max=5)
        ),
        vol.Required(CONF_MONITORED_CONDITIONS, default=[]): [vol.In(SENSOR_TYPES)],
    }
)


def setup_platform(hass, config, add_entities, discovery_info=None):
    """Set up the Yahoo! weather sensor."""
    unit = hass.config.units.temperature_unit
    woeid = config.get(CONF_WOEID)
    forecast = config.get(CONF_FORECAST)
    name = config.get(CONF_NAME)

    yunit = UNIT_C if unit == TEMP_CELSIUS else UNIT_F

    SENSOR_TYPES["temperature"][1] = unit
    SENSOR_TYPES["temp_min"][1] = unit
    SENSOR_TYPES["temp_max"][1] = unit

    # If not exists a customer WOEID/calculation from Home Assistant
    if woeid is None:
        woeid = get_woeid(hass.config.latitude, hass.config.longitude)
        if woeid is None:
            _LOGGER.critical("Can't retrieve WOEID from yahoo!")
            return False

    yahoo_api = YahooWeatherData(woeid, yunit)

    if not yahoo_api.update():
        _LOGGER.critical("Can't retrieve weather data from Yahoo!")
        return False

    if forecast >= len(yahoo_api.yahoo.Forecast):
        _LOGGER.error(
            "Yahoo! only support %d days forecast!", len(yahoo_api.yahoo.Forecast)
        )
        return False

    dev = []
    for variable in config[CONF_MONITORED_CONDITIONS]:
        dev.append(YahooWeatherSensor(yahoo_api, name, forecast, variable))

    add_entities(dev, True)


class YahooWeatherSensor(Entity):
    """Implementation of the Yahoo! weather sensor."""

    def __init__(self, weather_data, name, forecast, sensor_type):
        """Initialize the sensor."""
        self._client = name
        self._name = SENSOR_TYPES[sensor_type][0]
        self._type = sensor_type
        self._state = None
        self._unit = SENSOR_TYPES[sensor_type][1]
        self._data = weather_data
        self._forecast = forecast
        self._code = None

    @property
    def name(self):
        """Return the name of the sensor."""
        return f"{self._client} {self._name}"

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

    @property
    def unit_of_measurement(self):
        """Return the unit of measurement of this entity, if any."""
        return self._data.yahoo.Units.get(self._unit, self._unit)

    @property
    def entity_picture(self):
        """Return the entity picture to use in the frontend, if any."""
        if self._code is None or "weather" not in self._type:
            return None

        return self._data.yahoo.getWeatherImage(self._code)

    @property
    def device_state_attributes(self):
        """Return the state attributes."""
        attrs = {ATTR_ATTRIBUTION: ATTRIBUTION}

        if self._code is not None and "weather" in self._type:
            attrs["condition_code"] = self._code

        return attrs

    def update(self):
        """Get the latest data from Yahoo! and updates the states."""
        self._data.update()
        if not self._data.yahoo.RawData:
            _LOGGER.info("Don't receive weather data from Yahoo!")
            return

        # Default code for weather image
        self._code = self._data.yahoo.Now["code"]

        # Read data
        if self._type == "weather_current":
            self._state = self._data.yahoo.Now["text"]
        elif self._type == "weather":
            self._code = self._data.yahoo.Forecast[self._forecast]["code"]
            self._state = self._data.yahoo.Forecast[self._forecast]["text"]
        elif self._type == "temperature":
            self._state = self._data.yahoo.Now["temp"]
        elif self._type == "temp_min":
            self._code = self._data.yahoo.Forecast[self._forecast]["code"]
            self._state = self._data.yahoo.Forecast[self._forecast]["low"]
        elif self._type == "temp_max":
            self._code = self._data.yahoo.Forecast[self._forecast]["code"]
            self._state = self._data.yahoo.Forecast[self._forecast]["high"]
        elif self._type == "wind_speed":
            self._state = round(float(self._data.yahoo.Wind["speed"]) / 1.61, 2)
        elif self._type == "humidity":
            self._state = self._data.yahoo.Atmosphere["humidity"]
        elif self._type == "pressure":
            self._state = round(
                float(self._data.yahoo.Atmosphere["pressure"]) / 33.8637526, 2
            )
        elif self._type == "visibility":
            self._state = round(
                float(self._data.yahoo.Atmosphere["visibility"]) / 1.61, 2
            )


class YahooWeatherData:
    """Handle Yahoo! API object and limit updates."""

    def __init__(self, woeid, temp_unit):
        """Initialize the data object."""
        self._yahoo = YahooWeather(woeid, temp_unit)

    @property
    def yahoo(self):
        """Return Yahoo! API object."""
        return self._yahoo

    @Throttle(MIN_TIME_BETWEEN_UPDATES)
    def update(self):
        """Get the latest data from Yahoo!."""
        return self._yahoo.updateWeather()