"""Support for sensors from the Dovado router."""
from datetime import timedelta
import logging
import re

import voluptuous as vol

from homeassistant.components.sensor import PLATFORM_SCHEMA
from homeassistant.const import CONF_SENSORS
import homeassistant.helpers.config_validation as cv
from homeassistant.helpers.entity import Entity

from . import DOMAIN as DOVADO_DOMAIN

_LOGGER = logging.getLogger(__name__)

MIN_TIME_BETWEEN_UPDATES = timedelta(seconds=30)

SENSOR_UPLOAD = "upload"
SENSOR_DOWNLOAD = "download"
SENSOR_SIGNAL = "signal"
SENSOR_NETWORK = "network"
SENSOR_SMS_UNREAD = "sms"

SENSORS = {
    SENSOR_NETWORK: ("signal strength", "Network", None, "mdi:access-point-network"),
    SENSOR_SIGNAL: ("signal strength", "Signal Strength", "%", "mdi:signal"),
    SENSOR_SMS_UNREAD: ("sms unread", "SMS unread", "", "mdi:message-text-outline"),
    SENSOR_UPLOAD: ("traffic modem tx", "Sent", "GB", "mdi:cloud-upload"),
    SENSOR_DOWNLOAD: ("traffic modem rx", "Received", "GB", "mdi:cloud-download"),
}

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
    {vol.Required(CONF_SENSORS): vol.All(cv.ensure_list, [vol.In(SENSORS)])}
)


def setup_platform(hass, config, add_entities, discovery_info=None):
    """Set up the Dovado sensor platform."""
    dovado = hass.data[DOVADO_DOMAIN]

    entities = []
    for sensor in config[CONF_SENSORS]:
        entities.append(DovadoSensor(dovado, sensor))

    add_entities(entities)


class DovadoSensor(Entity):
    """Representation of a Dovado sensor."""

    def __init__(self, data, sensor):
        """Initialize the sensor."""
        self._data = data
        self._sensor = sensor
        self._state = self._compute_state()

    def _compute_state(self):
        """Compute the state of the sensor."""
        state = self._data.state.get(SENSORS[self._sensor][0])
        if self._sensor == SENSOR_NETWORK:
            match = re.search(r"\((.+)\)", state)
            return match.group(1) if match else None
        if self._sensor == SENSOR_SIGNAL:
            try:
                return int(state.split()[0])
            except ValueError:
                return None
        if self._sensor == SENSOR_SMS_UNREAD:
            return int(state)
        if self._sensor in [SENSOR_UPLOAD, SENSOR_DOWNLOAD]:
            return round(float(state) / 1e6, 1)
        return state

    def update(self):
        """Update sensor values."""
        self._data.update()
        self._state = self._compute_state()

    @property
    def name(self):
        """Return the name of the sensor."""
        return "{} {}".format(self._data.name, SENSORS[self._sensor][1])

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

    @property
    def icon(self):
        """Return the icon for the sensor."""
        return SENSORS[self._sensor][3]

    @property
    def unit_of_measurement(self):
        """Return the unit of measurement."""
        return SENSORS[self._sensor][2]

    @property
    def device_state_attributes(self):
        """Return the state attributes."""
        return {k: v for k, v in self._data.state.items() if k not in ["date", "time"]}
