"""Support for Genius Hub sensor devices."""
from datetime import timedelta

from homeassistant.const import DEVICE_CLASS_BATTERY
from homeassistant.core import callback
from homeassistant.helpers.dispatcher import async_dispatcher_connect
from homeassistant.helpers.entity import Entity
from homeassistant.util.dt import utc_from_timestamp, utcnow

from . import DOMAIN

GH_HAS_BATTERY = ["Room Thermostat", "Genius Valve", "Room Sensor", "Radiator Valve"]

GH_LEVEL_MAPPING = {
    "error": "Errors",
    "warning": "Warnings",
    "information": "Information",
}


async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
    """Set up the Genius Hub sensor entities."""
    client = hass.data[DOMAIN]["client"]

    sensors = [
        GeniusBattery(client, d)
        for d in client.hub.device_objs
        if d.type in GH_HAS_BATTERY
    ]
    issues = [GeniusIssue(client, i) for i in list(GH_LEVEL_MAPPING)]

    async_add_entities(sensors + issues, update_before_add=True)


class GeniusBattery(Entity):
    """Representation of a Genius Hub sensor."""

    def __init__(self, client, device):
        """Initialize the sensor."""
        self._client = client
        self._device = device

        self._name = "{} {}".format(device.type, device.id)

    async def async_added_to_hass(self):
        """Set up a listener when this entity is added to HA."""
        async_dispatcher_connect(self.hass, DOMAIN, self._refresh)

    @callback
    def _refresh(self):
        self.async_schedule_update_ha_state(force_refresh=True)

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

    @property
    def icon(self):
        """Return the icon of the sensor."""
        # noqa; pylint: disable=protected-access
        values = self._device._raw_data["childValues"]

        last_comms = utc_from_timestamp(values["lastComms"]["val"])
        if "WakeUp_Interval" in values:
            interval = timedelta(seconds=values["WakeUp_Interval"]["val"])
        else:
            interval = timedelta(minutes=20)

        if last_comms < utcnow() - interval * 3:
            return "mdi:battery-unknown"

        battery_level = self._device.data["state"]["batteryLevel"]
        if battery_level == 255:
            return "mdi:battery-unknown"
        if battery_level < 40:
            return "mdi:battery-alert"

        icon = "mdi:battery"
        if battery_level <= 95:
            icon += "-{}".format(int(round(battery_level / 10 - 0.01)) * 10)

        return icon

    @property
    def device_class(self):
        """Return the device class of the sensor."""
        return DEVICE_CLASS_BATTERY

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

    @property
    def should_poll(self) -> bool:
        """Return False as the geniushub devices should not be polled."""
        return False

    @property
    def state(self):
        """Return the state of the sensor."""
        level = self._device.data["state"].get("batteryLevel", 255)
        return level if level != 255 else 0

    @property
    def device_state_attributes(self):
        """Return the device state attributes."""
        attrs = {}
        attrs["assigned_zone"] = self._device.data["assignedZones"][0]["name"]

        # noqa; pylint: disable=protected-access
        last_comms = self._device._raw_data["childValues"]["lastComms"]["val"]
        attrs["last_comms"] = utc_from_timestamp(last_comms).isoformat()

        return {**attrs}


class GeniusIssue(Entity):
    """Representation of a Genius Hub sensor."""

    def __init__(self, client, level):
        """Initialize the sensor."""
        self._hub = client.hub
        self._name = GH_LEVEL_MAPPING[level]
        self._level = level
        self._issues = []

    async def async_added_to_hass(self):
        """Set up a listener when this entity is added to HA."""
        async_dispatcher_connect(self.hass, DOMAIN, self._refresh)

    @callback
    def _refresh(self):
        self.async_schedule_update_ha_state(force_refresh=True)

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

    @property
    def should_poll(self) -> bool:
        """Return False as the geniushub devices should not be polled."""
        return False

    @property
    def state(self):
        """Return the number of issues."""
        return len(self._issues)

    @property
    def device_state_attributes(self):
        """Return the device state attributes."""
        return {"{}_list".format(self._level): self._issues}

    async def async_update(self):
        """Process the sensor's state data."""
        self._issues = [
            i["description"] for i in self._hub.issues if i["level"] == self._level
        ]