"""Support for an Intergas boiler via an InComfort/Intouch Lan2RF gateway."""
import asyncio
import logging
from typing import Any, Dict, Optional

from aiohttp import ClientResponseError
from homeassistant.components.water_heater import WaterHeaterDevice
from homeassistant.const import TEMP_CELSIUS
from homeassistant.helpers.dispatcher import async_dispatcher_send

from . import DOMAIN

_LOGGER = logging.getLogger(__name__)

HEATER_ATTRS = ["display_code", "display_text", "is_burning"]


async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
    """Set up an InComfort/Intouch water_heater device."""
    if discovery_info is None:
        return

    client = hass.data[DOMAIN]["client"]
    heater = hass.data[DOMAIN]["heater"]

    async_add_entities([IncomfortWaterHeater(client, heater)])


class IncomfortWaterHeater(WaterHeaterDevice):
    """Representation of an InComfort/Intouch water_heater device."""

    def __init__(self, client, heater) -> None:
        """Initialize the water_heater device."""
        self._unique_id = f"{heater.serial_no}"

        self._client = client
        self._heater = heater

    @property
    def unique_id(self) -> Optional[str]:
        """Return a unique ID."""
        return self._unique_id

    @property
    def name(self) -> str:
        """Return the name of the water_heater device."""
        return "Boiler"

    @property
    def icon(self) -> str:
        """Return the icon of the water_heater device."""
        return "mdi:thermometer-lines"

    @property
    def device_state_attributes(self) -> Dict[str, Any]:
        """Return the device state attributes."""
        return {k: v for k, v in self._heater.status.items() if k in HEATER_ATTRS}

    @property
    def current_temperature(self) -> float:
        """Return the current temperature."""
        if self._heater.is_tapping:
            return self._heater.tap_temp
        if self._heater.is_pumping:
            return self._heater.heater_temp
        return max(self._heater.heater_temp, self._heater.tap_temp)

    @property
    def min_temp(self) -> float:
        """Return max valid temperature that can be set."""
        return 80.0

    @property
    def max_temp(self) -> float:
        """Return max valid temperature that can be set."""
        return 30.0

    @property
    def temperature_unit(self) -> str:
        """Return the unit of measurement."""
        return TEMP_CELSIUS

    @property
    def supported_features(self) -> int:
        """Return the list of supported features."""
        return 0

    @property
    def current_operation(self) -> str:
        """Return the current operation mode."""
        if self._heater.is_failed:
            return f"Fault code: {self._heater.fault_code}"

        return self._heater.display_text

    async def async_update(self) -> None:
        """Get the latest state data from the gateway."""
        try:
            await self._heater.update()

        except (ClientResponseError, asyncio.TimeoutError) as err:
            _LOGGER.warning("Update failed, message is: %s", err)

        else:
            async_dispatcher_send(self.hass, DOMAIN)