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

import asyncio
from contextlib import suppress
from functools import partial
from typing import Any

from pyfibaro.fibaro_device import DeviceModel

from homeassistant.components.light import (
    ATTR_BRIGHTNESS,
    ATTR_RGB_COLOR,
    ATTR_RGBW_COLOR,
    ENTITY_ID_FORMAT,
    ColorMode,
    LightEntity,
    brightness_supported,
    color_supported,
)
from homeassistant.config_entries import ConfigEntry
from homeassistant.const import Platform
from homeassistant.core import HomeAssistant
from homeassistant.helpers.entity_platform import AddEntitiesCallback

from . import FIBARO_DEVICES, FibaroDevice
from .const import DOMAIN

PARALLEL_UPDATES = 2


def scaleto255(value: int | None) -> int:
    """Scale the input value from 0-100 to 0-255."""
    if value is None:
        return 0
    # Fibaro has a funny way of storing brightness either 0-100 or 0-99
    # depending on device type (e.g. dimmer vs led)
    if value > 98:
        value = 100
    return round(value * 2.55)


def scaleto99(value: int | None) -> int:
    """Scale the input value from 0-255 to 0-99."""
    if value is None:
        return 0
    # Make sure a low but non-zero value is not rounded down to zero
    if 0 < value < 3:
        return 1
    return min(round(value / 2.55), 99)


async def async_setup_entry(
    hass: HomeAssistant,
    entry: ConfigEntry,
    async_add_entities: AddEntitiesCallback,
) -> None:
    """Perform the setup for Fibaro controller devices."""
    async_add_entities(
        [
            FibaroLight(device)
            for device in hass.data[DOMAIN][entry.entry_id][FIBARO_DEVICES][
                Platform.LIGHT
            ]
        ],
        True,
    )


class FibaroLight(FibaroDevice, LightEntity):
    """Representation of a Fibaro Light, including dimmable."""

    def __init__(self, fibaro_device: DeviceModel) -> None:
        """Initialize the light."""
        self._update_lock = asyncio.Lock()

        supports_color = (
            "color" in fibaro_device.properties
            or "colorComponents" in fibaro_device.properties
            or "RGB" in fibaro_device.type
            or "rgb" in fibaro_device.type
            or "color" in fibaro_device.base_type
        ) and (
            "setColor" in fibaro_device.actions
            or "setColorComponents" in fibaro_device.actions
        )
        supports_white_v = (
            "setW" in fibaro_device.actions
            or "RGBW" in fibaro_device.type
            or "rgbw" in fibaro_device.type
        )
        supports_dimming = (
            fibaro_device.has_interface("levelChange")
            and "setValue" in fibaro_device.actions
        )

        if supports_color and supports_white_v:
            self._attr_supported_color_modes = {ColorMode.RGBW}
            self._attr_color_mode = ColorMode.RGBW
        elif supports_color:
            self._attr_supported_color_modes = {ColorMode.RGB}
            self._attr_color_mode = ColorMode.RGB
        elif supports_dimming:
            self._attr_supported_color_modes = {ColorMode.BRIGHTNESS}
            self._attr_color_mode = ColorMode.BRIGHTNESS
        else:
            self._attr_supported_color_modes = {ColorMode.ONOFF}
            self._attr_color_mode = ColorMode.ONOFF

        super().__init__(fibaro_device)
        self.entity_id = ENTITY_ID_FORMAT.format(self.ha_id)

    async def async_turn_on(self, **kwargs: Any) -> None:
        """Turn the light on."""
        async with self._update_lock:
            await self.hass.async_add_executor_job(partial(self._turn_on, **kwargs))

    def _turn_on(self, **kwargs):
        """Really turn the light on."""
        if ATTR_BRIGHTNESS in kwargs:
            self._attr_brightness = kwargs[ATTR_BRIGHTNESS]
            self.set_level(scaleto99(self._attr_brightness))
            return

        if ATTR_RGB_COLOR in kwargs:
            # Update based on parameters
            self._attr_rgb_color = kwargs[ATTR_RGB_COLOR]
            self.call_set_color(*self._attr_rgb_color, 0)
            return

        if ATTR_RGBW_COLOR in kwargs:
            # Update based on parameters
            self._attr_rgbw_color = kwargs[ATTR_RGBW_COLOR]
            self.call_set_color(*self._attr_rgbw_color)
            return

        # The simplest case is left for last. No dimming, just switch on
        self.call_turn_on()

    async def async_turn_off(self, **kwargs: Any) -> None:
        """Turn the light off."""
        async with self._update_lock:
            await self.hass.async_add_executor_job(partial(self._turn_off, **kwargs))

    def _turn_off(self, **kwargs):
        """Really turn the light off."""
        self.call_turn_off()

    @property
    def is_on(self) -> bool | None:
        """Return true if device is on.

        Dimmable and RGB lights can be on based on different
        properties, so we need to check here several values.

        JSON for HC2 uses always string, HC3 uses int for integers.
        """
        if self.current_binary_state:
            return True
        with suppress(TypeError):
            if self.fibaro_device.brightness != 0:
                return True
        with suppress(TypeError):
            if self.fibaro_device.current_program != 0:
                return True
        with suppress(TypeError):
            if self.fibaro_device.current_program_id != 0:
                return True

        return False

    async def async_update(self) -> None:
        """Update the state."""
        async with self._update_lock:
            await self.hass.async_add_executor_job(self._update)

    def _update(self):
        """Really update the state."""
        # Brightness handling
        if brightness_supported(self.supported_color_modes):
            self._attr_brightness = scaleto255(self.fibaro_device.value.int_value())

        # Color handling
        if (
            color_supported(self.supported_color_modes)
            and self.fibaro_device.color.has_color
        ):
            # Fibaro communicates the color as an 'R, G, B, W' string
            rgbw = self.fibaro_device.color.rgbw_color
            if rgbw == (0, 0, 0, 0) and self.fibaro_device.last_color_set.has_color:
                rgbw = self.fibaro_device.last_color_set.rgbw_color

            if self._attr_color_mode == ColorMode.RGB:
                self._attr_rgb_color = rgbw[:3]
            else:
                self._attr_rgbw_color = rgbw
