"""Support for IHC lights."""
from __future__ import annotations

from homeassistant.components.light import (
    ATTR_BRIGHTNESS,
    SUPPORT_BRIGHTNESS,
    LightEntity,
)
from homeassistant.core import HomeAssistant
from homeassistant.helpers.entity_platform import AddEntitiesCallback
from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType

from . import IHC_CONTROLLER, IHC_INFO
from .const import CONF_DIMMABLE, CONF_OFF_ID, CONF_ON_ID
from .ihcdevice import IHCDevice
from .util import async_pulse, async_set_bool, async_set_int


def setup_platform(
    hass: HomeAssistant,
    config: ConfigType,
    add_entities: AddEntitiesCallback,
    discovery_info: DiscoveryInfoType | None = None,
) -> None:
    """Set up the IHC lights platform."""
    if discovery_info is None:
        return
    devices = []
    for name, device in discovery_info.items():
        ihc_id = device["ihc_id"]
        product_cfg = device["product_cfg"]
        product = device["product"]
        # Find controller that corresponds with device id
        ctrl_id = device["ctrl_id"]
        ihc_key = f"ihc{ctrl_id}"
        info = hass.data[ihc_key][IHC_INFO]
        ihc_controller = hass.data[ihc_key][IHC_CONTROLLER]
        ihc_off_id = product_cfg.get(CONF_OFF_ID)
        ihc_on_id = product_cfg.get(CONF_ON_ID)
        dimmable = product_cfg[CONF_DIMMABLE]
        light = IhcLight(
            ihc_controller, name, ihc_id, ihc_off_id, ihc_on_id, info, dimmable, product
        )
        devices.append(light)
    add_entities(devices)


class IhcLight(IHCDevice, LightEntity):
    """Representation of a IHC light.

    For dimmable lights, the associated IHC resource should be a light
    level (integer). For non dimmable light the IHC resource should be
    an on/off (boolean) resource
    """

    def __init__(
        self,
        ihc_controller,
        name,
        ihc_id: int,
        ihc_off_id: int,
        ihc_on_id: int,
        info: bool,
        dimmable=False,
        product=None,
    ) -> None:
        """Initialize the light."""
        super().__init__(ihc_controller, name, ihc_id, info, product)
        self._ihc_off_id = ihc_off_id
        self._ihc_on_id = ihc_on_id
        self._brightness = 0
        self._dimmable = dimmable
        self._state = False

    @property
    def brightness(self) -> int:
        """Return the brightness of this light between 0..255."""
        return self._brightness

    @property
    def is_on(self) -> bool:
        """Return true if light is on."""
        return self._state

    @property
    def supported_features(self):
        """Flag supported features."""
        if self._dimmable:
            return SUPPORT_BRIGHTNESS
        return 0

    async def async_turn_on(self, **kwargs):
        """Turn the light on."""
        if ATTR_BRIGHTNESS in kwargs:
            brightness = kwargs[ATTR_BRIGHTNESS]
        else:
            if (brightness := self._brightness) == 0:
                brightness = 255

        if self._dimmable:
            await async_set_int(
                self.hass, self.ihc_controller, self.ihc_id, int(brightness * 100 / 255)
            )
        else:
            if self._ihc_on_id:
                await async_pulse(self.hass, self.ihc_controller, self._ihc_on_id)
            else:
                await async_set_bool(self.hass, self.ihc_controller, self.ihc_id, True)

    async def async_turn_off(self, **kwargs):
        """Turn the light off."""
        if self._dimmable:
            await async_set_int(self.hass, self.ihc_controller, self.ihc_id, 0)
        else:
            if self._ihc_off_id:
                await async_pulse(self.hass, self.ihc_controller, self._ihc_off_id)
            else:
                await async_set_bool(self.hass, self.ihc_controller, self.ihc_id, False)

    def on_ihc_change(self, ihc_id, value):
        """Handle IHC notifications."""
        if isinstance(value, bool):
            self._dimmable = False
            self._state = value != 0
        else:
            self._dimmable = True
            self._state = value > 0
            if self._state:
                self._brightness = int(value * 255 / 100)
        self.schedule_update_ha_state()
