"""Support for Radarr."""
import logging
import time
from datetime import datetime, timedelta

import requests
import voluptuous as vol

import homeassistant.helpers.config_validation as cv
from homeassistant.const import (
    CONF_API_KEY,
    CONF_HOST,
    CONF_PORT,
    CONF_MONITORED_CONDITIONS,
    CONF_SSL,
)
from homeassistant.helpers.entity import Entity
from homeassistant.components.sensor import PLATFORM_SCHEMA

_LOGGER = logging.getLogger(__name__)

CONF_DAYS = "days"
CONF_INCLUDED = "include_paths"
CONF_UNIT = "unit"
CONF_URLBASE = "urlbase"

DEFAULT_HOST = "localhost"
DEFAULT_PORT = 7878
DEFAULT_URLBASE = ""
DEFAULT_DAYS = "1"
DEFAULT_UNIT = "GB"

SCAN_INTERVAL = timedelta(minutes=10)

SENSOR_TYPES = {
    "diskspace": ["Disk Space", "GB", "mdi:harddisk"],
    "upcoming": ["Upcoming", "Movies", "mdi:television"],
    "wanted": ["Wanted", "Movies", "mdi:television"],
    "movies": ["Movies", "Movies", "mdi:television"],
    "commands": ["Commands", "Commands", "mdi:code-braces"],
    "status": ["Status", "Status", "mdi:information"],
}

ENDPOINTS = {
    "diskspace": "http{0}://{1}:{2}/{3}api/diskspace",
    "upcoming": "http{0}://{1}:{2}/{3}api/calendar?start={4}&end={5}",
    "movies": "http{0}://{1}:{2}/{3}api/movie",
    "commands": "http{0}://{1}:{2}/{3}api/command",
    "status": "http{0}://{1}:{2}/{3}api/system/status",
}

# Support to Yottabytes for the future, why not
BYTE_SIZES = ["B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"]
PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
    {
        vol.Required(CONF_API_KEY): cv.string,
        vol.Optional(CONF_DAYS, default=DEFAULT_DAYS): cv.string,
        vol.Optional(CONF_HOST, default=DEFAULT_HOST): cv.string,
        vol.Optional(CONF_INCLUDED, default=[]): cv.ensure_list,
        vol.Optional(CONF_MONITORED_CONDITIONS, default=["movies"]): vol.All(
            cv.ensure_list, [vol.In(list(SENSOR_TYPES))]
        ),
        vol.Optional(CONF_PORT, default=DEFAULT_PORT): cv.port,
        vol.Optional(CONF_SSL, default=False): cv.boolean,
        vol.Optional(CONF_UNIT, default=DEFAULT_UNIT): vol.In(BYTE_SIZES),
        vol.Optional(CONF_URLBASE, default=DEFAULT_URLBASE): cv.string,
    }
)


def setup_platform(hass, config, add_entities, discovery_info=None):
    """Set up the Radarr platform."""
    conditions = config.get(CONF_MONITORED_CONDITIONS)
    add_entities([RadarrSensor(hass, config, sensor) for sensor in conditions], True)


class RadarrSensor(Entity):
    """Implementation of the Radarr sensor."""

    def __init__(self, hass, conf, sensor_type):
        """Create Radarr entity."""
        from pytz import timezone

        self.conf = conf
        self.host = conf.get(CONF_HOST)
        self.port = conf.get(CONF_PORT)
        self.urlbase = conf.get(CONF_URLBASE)
        if self.urlbase:
            self.urlbase = "{}/".format(self.urlbase.strip("/"))
        self.apikey = conf.get(CONF_API_KEY)
        self.included = conf.get(CONF_INCLUDED)
        self.days = int(conf.get(CONF_DAYS))
        self.ssl = "s" if conf.get(CONF_SSL) else ""
        self._state = None
        self.data = []
        self._tz = timezone(str(hass.config.time_zone))
        self.type = sensor_type
        self._name = SENSOR_TYPES[self.type][0]
        if self.type == "diskspace":
            self._unit = conf.get(CONF_UNIT)
        else:
            self._unit = SENSOR_TYPES[self.type][1]
        self._icon = SENSOR_TYPES[self.type][2]
        self._available = False

    @property
    def name(self):
        """Return the name of the sensor."""
        return "{} {}".format("Radarr", self._name)

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

    @property
    def available(self):
        """Return sensor availability."""
        return self._available

    @property
    def unit_of_measurement(self):
        """Return the unit of the sensor."""
        return self._unit

    @property
    def device_state_attributes(self):
        """Return the state attributes of the sensor."""
        attributes = {}
        if self.type == "upcoming":
            for movie in self.data:
                attributes[to_key(movie)] = get_release_date(movie)
        elif self.type == "commands":
            for command in self.data:
                attributes[command["name"]] = command["state"]
        elif self.type == "diskspace":
            for data in self.data:
                free_space = to_unit(data["freeSpace"], self._unit)
                total_space = to_unit(data["totalSpace"], self._unit)
                percentage_used = (
                    0 if total_space == 0 else free_space / total_space * 100
                )
                attributes[data["path"]] = "{:.2f}/{:.2f}{} ({:.2f}%)".format(
                    free_space, total_space, self._unit, percentage_used
                )
        elif self.type == "movies":
            for movie in self.data:
                attributes[to_key(movie)] = movie["downloaded"]
        elif self.type == "status":
            attributes = self.data

        return attributes

    @property
    def icon(self):
        """Return the icon of the sensor."""
        return self._icon

    def update(self):
        """Update the data for the sensor."""
        start = get_date(self._tz)
        end = get_date(self._tz, self.days)
        try:
            res = requests.get(
                ENDPOINTS[self.type].format(
                    self.ssl, self.host, self.port, self.urlbase, start, end
                ),
                headers={"X-Api-Key": self.apikey},
                timeout=10,
            )
        except OSError:
            _LOGGER.warning("Host %s is not available", self.host)
            self._available = False
            self._state = None
            return

        if res.status_code == 200:
            if self.type in ["upcoming", "movies", "commands"]:
                self.data = res.json()
                self._state = len(self.data)
            elif self.type == "diskspace":
                # If included paths are not provided, use all data
                if self.included == []:
                    self.data = res.json()
                else:
                    # Filter to only show lists that are included
                    self.data = list(
                        filter(lambda x: x["path"] in self.included, res.json())
                    )
                self._state = "{:.2f}".format(
                    to_unit(sum([data["freeSpace"] for data in self.data]), self._unit)
                )
            elif self.type == "status":
                self.data = res.json()
                self._state = self.data["version"]
            self._available = True


def get_date(zone, offset=0):
    """Get date based on timezone and offset of days."""
    day = 60 * 60 * 24
    return datetime.date(datetime.fromtimestamp(time.time() + day * offset, tz=zone))


def get_release_date(data):
    """Get release date."""
    date = data.get("physicalRelease")
    if not date:
        date = data.get("inCinemas")
    return date


def to_key(data):
    """Get key."""
    return "{} ({})".format(data["title"], data["year"])


def to_unit(value, unit):
    """Convert bytes to give unit."""
    return value / 1024 ** BYTE_SIZES.index(unit)
