"""
Get ride details and liveboard details for NMBS (Belgian railway).

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

import voluptuous as vol

from homeassistant.components.sensor import PLATFORM_SCHEMA
from homeassistant.const import (
    ATTR_ATTRIBUTION, ATTR_LATITUDE, ATTR_LONGITUDE, CONF_NAME,
    CONF_SHOW_ON_MAP)
import homeassistant.helpers.config_validation as cv
from homeassistant.helpers.entity import Entity
import homeassistant.util.dt as dt_util

_LOGGER = logging.getLogger(__name__)

DEFAULT_NAME = 'NMBS'

DEFAULT_ICON = "mdi:train"
DEFAULT_ICON_ALERT = "mdi:alert-octagon"

CONF_STATION_FROM = 'station_from'
CONF_STATION_TO = 'station_to'
CONF_STATION_LIVE = 'station_live'
CONF_EXCLUDE_VIAS = 'exclude_vias'

REQUIREMENTS = ["pyrail==0.0.3"]

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
    vol.Required(CONF_STATION_FROM): cv.string,
    vol.Required(CONF_STATION_TO): cv.string,
    vol.Optional(CONF_STATION_LIVE): cv.string,
    vol.Optional(CONF_EXCLUDE_VIAS, default=False): cv.boolean,
    vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
    vol.Optional(CONF_SHOW_ON_MAP, default=False): cv.boolean,
})


def get_time_until(departure_time=None):
    """Calculate the time between now and a train's departure time."""
    if departure_time is None:
        return 0

    delta = dt_util.utc_from_timestamp(int(departure_time)) - dt_util.now()
    return round((delta.total_seconds() / 60))


def get_delay_in_minutes(delay=0):
    """Get the delay in minutes from a delay in seconds."""
    return round((int(delay) / 60))


def get_ride_duration(departure_time, arrival_time, delay=0):
    """Calculate the total travel time in minutes."""
    duration = dt_util.utc_from_timestamp(
        int(arrival_time)) - dt_util.utc_from_timestamp(int(departure_time))
    duration_time = int(round((duration.total_seconds() / 60)))
    return duration_time + get_delay_in_minutes(delay)


def setup_platform(hass, config, add_entities, discovery_info=None):
    """Set up the NMBS sensor with iRail API."""
    from pyrail import iRail
    api_client = iRail()

    name = config[CONF_NAME]
    show_on_map = config[CONF_SHOW_ON_MAP]
    station_from = config[CONF_STATION_FROM]
    station_to = config[CONF_STATION_TO]
    station_live = config.get(CONF_STATION_LIVE)
    excl_vias = config[CONF_EXCLUDE_VIAS]

    sensors = [NMBSSensor(
        api_client, name, show_on_map, station_from, station_to, excl_vias)]

    if station_live is not None:
        sensors.append(NMBSLiveBoard(api_client, station_live))

    add_entities(sensors, True)


class NMBSLiveBoard(Entity):
    """Get the next train from a station's liveboard."""

    def __init__(self, api_client, live_station):
        """Initialize the sensor for getting liveboard data."""
        self._station = live_station
        self._api_client = api_client

        self._attrs = {}
        self._state = None

    @property
    def name(self):
        """Return the sensor default name."""
        return "NMBS Live"

    @property
    def icon(self):
        """Return the default icon or an alert icon if delays."""
        if self._attrs and int(self._attrs['delay']) > 0:
            return DEFAULT_ICON_ALERT

        return DEFAULT_ICON

    @property
    def state(self):
        """Return sensor state."""
        return self._state

    @property
    def device_state_attributes(self):
        """Return the sensor attributes if data is available."""
        if self._state is None or not self._attrs: