"""Component for interfacing RFK101 proximity card readers.

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

import voluptuous as vol

import homeassistant.helpers.config_validation as cv
from homeassistant.const import (
    CONF_HOST, CONF_PORT, CONF_NAME, EVENT_HOMEASSISTANT_STOP)

REQUIREMENTS = ['rfk101py==0.0.1']

_LOGGER = logging.getLogger(__name__)

DOMAIN = "idteck_prox"

EVENT_IDTECK_PROX_KEYCARD = 'idteck_prox_keycard'

CONFIG_SCHEMA = vol.Schema({
    DOMAIN: vol.All(cv.ensure_list, [vol.Schema({
        vol.Required(CONF_HOST): cv.string,
        vol.Required(CONF_PORT): cv.port,
        vol.Required(CONF_NAME): cv.string,
    })])
}, extra=vol.ALLOW_EXTRA)


def setup(hass, config):
    """Set up the IDTECK proximity card component."""
    conf = config[DOMAIN]
    for unit in conf:
        host = unit[CONF_HOST]
        port = unit[CONF_PORT]
        name = unit[CONF_NAME]

        try:
            reader = IdteckReader(hass, host, port, name)
            reader.connect()
            hass.bus.listen_once(EVENT_HOMEASSISTANT_STOP, reader.stop)
        except OSError as error:
            _LOGGER.error('Error creating "%s". %s', name, error)
            return False

    return True


class IdteckReader():
    """Representation of an IDTECK proximity card reader."""

    def __init__(self, hass, host, port, name):
        """Initialize the reader."""
        self.hass = hass
        self._host = host
        self._port = port
        self._name = name
        self._connection = None

    def connect(self):
        """Connect to the reader."""
        from rfk101py.rfk101py import rfk101py
        self._connection = rfk101py(self._host, self._port, self._callback)

    def _callback(self, card):
        """Send a keycard event message into HASS whenever a card is read."""
        self.hass.bus.fire(
            EVENT_IDTECK_PROX_KEYCARD, {'card': card, 'name': self._name})

    def stop(self):
        """Close resources."""
        if self._connection:
            self._connection.close()
            self._connection = None