"""
Support for Speedtest.net internet speed testing sensor.

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

from homeassistant.components.speedtestdotnet.const import \
    DOMAIN as SPEEDTESTDOTNET_DOMAIN, DATA_UPDATED, SENSOR_TYPES
from homeassistant.const import ATTR_ATTRIBUTION
from homeassistant.core import callback
from homeassistant.helpers.dispatcher import async_dispatcher_connect
from homeassistant.helpers.restore_state import RestoreEntity

DEPENDENCIES = ['speedtestdotnet']

_LOGGER = logging.getLogger(__name__)

ATTR_BYTES_RECEIVED = 'bytes_received'
ATTR_BYTES_SENT = 'bytes_sent'
ATTR_SERVER_COUNTRY = 'server_country'
ATTR_SERVER_HOST = 'server_host'
ATTR_SERVER_ID = 'server_id'
ATTR_SERVER_LATENCY = 'latency'
ATTR_SERVER_NAME = 'server_name'

ATTRIBUTION = 'Data retrieved from Speedtest.net by Ookla'

ICON = 'mdi:speedometer'


async def async_setup_platform(hass, config, async_add_entities,
                               discovery_info):
    """Set up the Speedtest.net sensor."""
    data = hass.data[SPEEDTESTDOTNET_DOMAIN]
    async_add_entities(
        [SpeedtestSensor(data, sensor) for sensor in discovery_info]
    )


class SpeedtestSensor(RestoreEntity):
    """Implementation of a speedtest.net sensor."""

    def __init__(self, speedtest_data, sensor_type):
        """Initialize the sensor."""
        self._name = SENSOR_TYPES[sensor_type][0]
        self.speedtest_client = speedtest_data
        self.type = sensor_type
        self._state = None
        self._data = None
        self._unit_of_measurement = SENSOR_TYPES[self.type][1]

    @property
    def name(self):
        """Return the name of the sensor."""
        return '{} {}'.format('Speedtest', 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._unit_of_measurement

    @property
    def icon(self):
        """Return icon."""
        return ICON

    @property
    def should_poll(self):
        """Return the polling requirement for this sensor."""
        return False

    @property
    def device_state_attributes(self):
        """Return the state attributes."""
        attributes = {
            ATTR_ATTRIBUTION: ATTRIBUTION
        }
        if self._data is not None:
            return attributes.update({
                ATTR_BYTES_RECEIVED: self._data['bytes_received'],
                ATTR_BYTES_SENT: self._data['bytes_sent'],
                ATTR_SERVER_COUNTRY: self._data['server']['country'],
                ATTR_SERVER_ID: self._data['server']['id'],
                ATTR_SERVER_LATENCY: self._data['server']['latency'],
                ATTR_SERVER_NAME: self._data['server']['name'],
            })
        return attributes

    async def async_added_to_hass(self):
        """Handle entity which will be added."""
        await super().async_added_to_hass()
        state = await self.async_get_last_state()
        if not state:
            return
        self._state = state.state

        async_dispatcher_connect(
            self.hass, DATA_UPDATED, self._schedule_immediate_update
        )

    def update(self):
        """Get the latest data and update the states."""
        self._data = self.speedtest_client.data
        if self._data is None:
            return

        if self.type == 'ping':
            self._state = self._data['ping']
        elif self.type == 'download':
            self._state = round(self._data['download'] / 10**6, 2)
        elif self.type == 'upload':
            self._state = round(self._data['upload'] / 10**6, 2)

    @callback
    def _schedule_immediate_update(self):
        self.async_schedule_update_ha_state(True)