"""Sensor for Fedex packages."""
import logging
from collections import defaultdict
from datetime import timedelta

import voluptuous as vol

import homeassistant.helpers.config_validation as cv
from homeassistant.components.sensor import PLATFORM_SCHEMA
from homeassistant.const import (
    CONF_NAME,
    CONF_USERNAME,
    CONF_PASSWORD,
    ATTR_ATTRIBUTION,
    CONF_SCAN_INTERVAL,
)
from homeassistant.helpers.entity import Entity
from homeassistant.util import Throttle
from homeassistant.util import slugify
from homeassistant.util.dt import now, parse_date

_LOGGER = logging.getLogger(__name__)

COOKIE = "fedexdeliverymanager_cookies.pickle"

DOMAIN = "fedex"

ICON = "mdi:package-variant-closed"

STATUS_DELIVERED = "delivered"

SCAN_INTERVAL = timedelta(seconds=1800)

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
    {
        vol.Required(CONF_USERNAME): cv.string,
        vol.Required(CONF_PASSWORD): cv.string,
        vol.Optional(CONF_NAME): cv.string,
    }
)


def setup_platform(hass, config, add_entities, discovery_info=None):
    """Set up the Fedex platform."""
    import fedexdeliverymanager

    _LOGGER.warning(
        "The fedex integration is deprecated and will be removed "
        "in Home Assistant 0.100.0. For more information see ADR-0004:"
        "https://github.com/home-assistant/architecture/blob/master/adr/0004-webscraping.md"
    )

    name = config.get(CONF_NAME)
    update_interval = config.get(CONF_SCAN_INTERVAL, SCAN_INTERVAL)

    try:
        cookie = hass.config.path(COOKIE)
        session = fedexdeliverymanager.get_session(
            config.get(CONF_USERNAME), config.get(CONF_PASSWORD), cookie_path=cookie
        )
    except fedexdeliverymanager.FedexError:
        _LOGGER.exception("Could not connect to Fedex Delivery Manager")
        return False

    add_entities([FedexSensor(session, name, update_interval)], True)


class FedexSensor(Entity):
    """Fedex Sensor."""

    def __init__(self, session, name, interval):
        """Initialize the sensor."""
        self._session = session
        self._name = name
        self._attributes = None
        self._state = None
        self.update = Throttle(interval)(self._update)

    @property
    def name(self):
        """Return the name of the sensor."""
        return self._name or DOMAIN

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

    @property
    def unit_of_measurement(self):
        """Return the unit of measurement of this entity, if any."""
        return "packages"

    def _update(self):
        """Update device state."""
        import fedexdeliverymanager

        status_counts = defaultdict(int)
        for package in fedexdeliverymanager.get_packages(self._session):
            status = slugify(package["primary_status"])
            skip = (
                status == STATUS_DELIVERED
                and parse_date(package["delivery_date"]) < now().date()
            )
            if skip:
                continue
            status_counts[status] += 1
        self._attributes = {ATTR_ATTRIBUTION: fedexdeliverymanager.ATTRIBUTION}
        self._attributes.update(status_counts)
        self._state = sum(status_counts.values())

    @property
    def device_state_attributes(self):
        """Return the state attributes."""
        return self._attributes

    @property
    def icon(self):
        """Icon to use in the frontend."""
        return ICON