"""
Support for Australian BOM (Bureau of Meteorology) weather service.

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

import voluptuous as vol

from homeassistant.components.weather import WeatherEntity, PLATFORM_SCHEMA
from homeassistant.const import \
    CONF_NAME, TEMP_CELSIUS, CONF_LATITUDE, CONF_LONGITUDE
from homeassistant.helpers import config_validation as cv
# Reuse data and API logic from the sensor implementation
from homeassistant.components.sensor.bom import \
    BOMCurrentData, closest_station, CONF_STATION, validate_station

_LOGGER = logging.getLogger(__name__)

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
    vol.Optional(CONF_NAME): cv.string,
    vol.Optional(CONF_STATION): validate_station,
})


def setup_platform(hass, config, add_devices, discovery_info=None):
    """Set up the BOM weather platform."""
    station = config.get(CONF_STATION) or closest_station(
        config.get(CONF_LATITUDE),
        config.get(CONF_LONGITUDE),
        hass.config.config_dir)
    if station is None:
        _LOGGER.error("Could not get BOM weather station from lat/lon")
        return False
    bom_data = BOMCurrentData(hass, station)
    try:
        bom_data.update()
    except ValueError as err:
        _LOGGER.error("Received error from BOM_Current: %s", err)
        return False
    add_devices([BOMWeather(bom_data, config.get(CONF_NAME))], True)


class BOMWeather(WeatherEntity):
    """Representation of a weather condition."""

    def __init__(self, bom_data, stationname=None):
        """Initialise the platform with a data instance and station name."""
        self.bom_data = bom_data
        self.stationname = stationname or self.bom_data.data.get('name')

    def update(self):
        """Update current conditions."""
        self.bom_data.update()

    @property
    def name(self):
        """Return the name of the sensor."""
        return 'BOM {}'.format(self.stationname or '(unknown station)')

    @property
    def condition(self):
        """Return the current condition."""
        return self.bom_data.data.get('weather')

    # Now implement the WeatherEntity interface

    @property
    def temperature(self):
        """Return the platform temperature."""
        return self.bom_data.data.get('air_temp')

    @property
    def temperature_unit(self):
        """Return the unit of measurement."""
        return TEMP_CELSIUS

    @property
    def pressure(self):
        """Return the mean sea-level pressure."""
        return self.bom_data.data.get('press_msl')

    @property
    def humidity(self):
        """Return the relative humidity."""
        return self.bom_data.data.get('rel_hum')

    @property
    def wind_speed(self):
        """Return the wind speed."""
        return self.bom_data.data.get('wind_spd_kmh')

    @property
    def wind_bearing(self):
        """Return the wind bearing."""
        directions = ['N', 'NNE', 'NE', 'ENE',
                      'E', 'ESE', 'SE', 'SSE',
                      'S', 'SSW', 'SW', 'WSW',
                      'W', 'WNW', 'NW', 'NNW']
        wind = {name: idx * 360 / 16 for idx, name in enumerate(directions)}
        return wind.get(self.bom_data.data.get('wind_dir'))

    @property
    def attribution(self):
        """Return the attribution."""
        return "Data provided by the Australian Bureau of Meteorology"
