"""
Support for the Environment Canada radar imagery.

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

import voluptuous as vol

from homeassistant.components.camera import (
    PLATFORM_SCHEMA, Camera)
from homeassistant.const import (
    CONF_NAME, CONF_LATITUDE, CONF_LONGITUDE, ATTR_ATTRIBUTION)
from homeassistant.util import Throttle
import homeassistant.helpers.config_validation as cv

_LOGGER = logging.getLogger(__name__)

ATTR_STATION = 'station'
ATTR_LOCATION = 'location'

CONF_ATTRIBUTION = "Data provided by Environment Canada"
CONF_STATION = 'station'
CONF_LOOP = 'loop'
CONF_PRECIP_TYPE = 'precip_type'

MIN_TIME_BETWEEN_UPDATES = datetime.timedelta(minutes=10)

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
    vol.Optional(CONF_LOOP, default=True): cv.boolean,
    vol.Optional(CONF_NAME): cv.string,
    vol.Optional(CONF_STATION): cv.string,
    vol.Inclusive(CONF_LATITUDE, 'latlon'): cv.latitude,
    vol.Inclusive(CONF_LONGITUDE, 'latlon'): cv.longitude,
    vol.Optional(CONF_PRECIP_TYPE): ['RAIN', 'SNOW'],
})


def setup_platform(hass, config, add_devices, discovery_info=None):
    """Set up the Environment Canada camera."""
    from env_canada import ECRadar

    if config.get(CONF_STATION):
        radar_object = ECRadar(station_id=config[CONF_STATION],
                               precip_type=config.get(CONF_PRECIP_TYPE))
    elif config.get(CONF_LATITUDE) and config.get(CONF_LONGITUDE):
        radar_object = ECRadar(coordinates=(config[CONF_LATITUDE],
                                            config[CONF_LONGITUDE]),
                               precip_type=config.get(CONF_PRECIP_TYPE))
    else:
        radar_object = ECRadar(coordinates=(hass.config.latitude,
                                            hass.config.longitude),
                               precip_type=config.get(CONF_PRECIP_TYPE))

    add_devices([ECCamera(radar_object, config.get(CONF_NAME))], True)


class ECCamera(Camera):
    """Implementation of an Environment Canada radar camera."""

    def __init__(self, radar_object, camera_name):
        """Initialize the camera."""
        super().__init__()

        self.radar_object = radar_object
        self.camera_name = camera_name
        self.content_type = 'image/gif'
        self.image = None

    def camera_image(self):
        """Return bytes of camera image."""
        self.update()
        return self.image

    @property
    def name(self):
        """Return the name of the camera."""
        if self.camera_name is not None:
            return self.camera_name
        return ' '.join([self.radar_object.station_name, 'Radar'])

    @property
    def device_state_attributes(self):
        """Return the state attributes of the device."""
        attr = {
            ATTR_ATTRIBUTION: CONF_ATTRIBUTION,
            ATTR_LOCATION: self.radar_object.station_name,
            ATTR_STATION: self.radar_object.station_code
        }

        return attr

    @Throttle(MIN_TIME_BETWEEN_UPDATES)
    def update(self):
        """Update radar image."""
        if CONF_LOOP:
            self.image = self.radar_object.get_loop()
        else:
            self.image = self.radar_object.get_latest_frame()
