"""
homeassistant.components.sensor.rfxtrx
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Shows sensor values from rfxtrx sensors.

Possible config keys:
device="path to rfxtrx device"

Example:

sensor 2:
 platform: rfxtrx
 device :  /dev/serial/by-id/usb-RFXCOM_RFXtrx433_A1Y0NJGR-if00-port0

"""
import logging
from collections import OrderedDict

from homeassistant.const import (
    ATTR_BATTERY_LEVEL, TEMP_CELCIUS)
from homeassistant.helpers.entity import Entity

REQUIREMENTS = ['https://github.com/Danielhiversen/pyRFXtrx/archive/master.zip'
                '#RFXtrx>=0.15']

DATA_TYPES = OrderedDict([
    ('Temperature', TEMP_CELCIUS),
    ('Humidity', '%'),
    ('Forecast', ''),
    ('Barometer', ''),
    ('Wind direction', ''),
    ('Humidity status', ''),
    ('Humidity status numeric', ''),
    ('Forecast numeric', ''),
    ('Rain rate', ''),
    ('Rain total', ''),
    ('Wind average speed', ''),
    ('Wind gust', ''),
    ('Chill', ''),
    ('Battery numeric', ATTR_BATTERY_LEVEL),
    ('Rssi numeric', '')])


def setup_platform(hass, config, add_devices, discovery_info=None):
    """ Setup the rfxtrx platform. """
    logger = logging.getLogger(__name__)

    devices = {}    # keep track of devices added to HA

    def sensor_update(event):
        """ Callback for sensor updates from the MySensors gateway. """
        if event.device.id_string in devices:
            devices[event.device.id_string].event = event
        else:
            logger.info("adding new devices: %s", event.device.type_string)
            new_device = RfxtrxSensor(event)
            devices[event.device.id_string] = new_device
            add_devices([new_device])
    try:
        import RFXtrx as rfxtrx
    except ImportError:
        logger.exception(
            "Failed to import rfxtrx")
        return False

    device = config.get("device", True)
    rfxtrx.Core(device, sensor_update)


class RfxtrxSensor(Entity):
    """ Represents a Vera Sensor. """

    def __init__(self, event):
        self.event = event

        self._unit_of_measurement = None
        self._data_type = None
        for data_type in DATA_TYPES:
            if data_type in self.event.values:
                self._unit_of_measurement = DATA_TYPES[data_type]
                self._data_type = data_type
                break

        id_string = int(event.device.id_string.replace(":", ""), 16)
        self._name = "{} {} ({})".format(self._data_type,
                                         self.event.device.type_string,
                                         id_string)

    def __str__(self):
        return self._name

    @property
    def state(self):
        if self._data_type:
            return self.event.values[self._data_type]
        return None

    @property
    def name(self):
        """ Get the mame of the sensor. """
        return self._name

    @property
    def state_attributes(self):
        attr = super().state_attributes
        for data_type in DATA_TYPES:
            if data_type in self.event.values:
                attr[data_type] = self.event.values[data_type]
        return attr

    @property
    def unit_of_measurement(self):
        return self._unit_of_measurement