"""Support for LED lights that can be controlled using PWM."""
import logging

from pwmled import Color
from pwmled.driver.gpio import GpioDriver
from pwmled.driver.pca9685 import Pca9685Driver
from pwmled.led import SimpleLed
from pwmled.led.rgb import RgbLed
from pwmled.led.rgbw import RgbwLed
import voluptuous as vol

from homeassistant.components.light import (
    ATTR_BRIGHTNESS,
    ATTR_HS_COLOR,
    ATTR_TRANSITION,
    PLATFORM_SCHEMA,
    SUPPORT_BRIGHTNESS,
    SUPPORT_COLOR,
    SUPPORT_TRANSITION,
    LightEntity,
)
from homeassistant.const import CONF_ADDRESS, CONF_HOST, CONF_NAME, CONF_TYPE, STATE_ON
import homeassistant.helpers.config_validation as cv
from homeassistant.helpers.restore_state import RestoreEntity
import homeassistant.util.color as color_util

_LOGGER = logging.getLogger(__name__)

CONF_LEDS = "leds"
CONF_DRIVER = "driver"
CONF_PINS = "pins"
CONF_FREQUENCY = "frequency"

CONF_DRIVER_GPIO = "gpio"
CONF_DRIVER_PCA9685 = "pca9685"
CONF_DRIVER_TYPES = [CONF_DRIVER_GPIO, CONF_DRIVER_PCA9685]

CONF_LED_TYPE_SIMPLE = "simple"
CONF_LED_TYPE_RGB = "rgb"
CONF_LED_TYPE_RGBW = "rgbw"
CONF_LED_TYPES = [CONF_LED_TYPE_SIMPLE, CONF_LED_TYPE_RGB, CONF_LED_TYPE_RGBW]

DEFAULT_BRIGHTNESS = 255
DEFAULT_COLOR = [0, 0]

SUPPORT_SIMPLE_LED = SUPPORT_BRIGHTNESS | SUPPORT_TRANSITION
SUPPORT_RGB_LED = SUPPORT_BRIGHTNESS | SUPPORT_COLOR | SUPPORT_TRANSITION

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
    {
        vol.Required(CONF_LEDS): vol.All(
            cv.ensure_list,
            [
                {
                    vol.Required(CONF_NAME): cv.string,
                    vol.Required(CONF_DRIVER): vol.In(CONF_DRIVER_TYPES),
                    vol.Required(CONF_PINS): vol.All(cv.ensure_list, [cv.positive_int]),
                    vol.Required(CONF_TYPE): vol.In(CONF_LED_TYPES),
                    vol.Optional(CONF_FREQUENCY): cv.positive_int,
                    vol.Optional(CONF_ADDRESS): cv.byte,
                    vol.Optional(CONF_HOST): cv.string,
                }
            ],
        )
    }
)


def setup_platform(hass, config, add_entities, discovery_info=None):
    """Set up the PWM LED lights."""

    leds = []
    for led_conf in config[CONF_LEDS]:
        driver_type = led_conf[CONF_DRIVER]
        pins = led_conf[CONF_PINS]
        opt_args = {}
        if CONF_FREQUENCY in led_conf:
            opt_args["freq"] = led_conf[CONF_FREQUENCY]
        if driver_type == CONF_DRIVER_GPIO:
            if CONF_HOST in led_conf:
                opt_args["host"] = led_conf[CONF_HOST]
            driver = GpioDriver(pins, **opt_args)
        elif driver_type == CONF_DRIVER_PCA9685:
            if CONF_ADDRESS in led_conf:
                opt_args["address"] = led_conf[CONF_ADDRESS]
            driver = Pca9685Driver(pins, **opt_args)
        else:
            _LOGGER.error("Invalid driver type")
            return

        name = led_conf[CONF_NAME]
        led_type = led_conf[CONF_TYPE]
        if led_type == CONF_LED_TYPE_SIMPLE:
            led = PwmSimpleLed(SimpleLed(driver), name)
        elif led_type == CONF_LED_TYPE_RGB:
            led = PwmRgbLed(RgbLed(driver), name)
        elif led_type == CONF_LED_TYPE_RGBW:
            led = PwmRgbLed(RgbwLed(driver), name)
        else:
            _LOGGER.error("Invalid led type")
            return
        leds.append(led)

    add_entities(leds)


class PwmSimpleLed(LightEntity, RestoreEntity):
    """Representation of a simple one-color PWM LED."""

    def __init__(self, led, name):
        """Initialize one-color PWM LED."""
        self._led = led
        self._name = name
        self._is_on = False
        self._brightness = DEFAULT_BRIGHTNESS

    async def async_added_to_hass(self):
        """Handle entity about to be added to hass event."""
        await super().async_added_to_hass()
        last_state = await self.async_get_last_state()
        if last_state:
            self._is_on = last_state.state == STATE_ON
            self._brightness = last_state.attributes.get(
                "brightness", DEFAULT_BRIGHTNESS
            )
            self._led.set(
                is_on=self._is_on, brightness=_from_hass_brightness(self._brightness)
            )

    @property
    def should_poll(self):
        """No polling needed."""
        return False

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

    @property
    def is_on(self):
        """Return true if device is on."""
        return self._is_on

    @property
    def brightness(self):
        """Return the brightness property."""
        return self._brightness

    @property
    def supported_features(self):
        """Flag supported features."""
        return SUPPORT_SIMPLE_LED

    def turn_on(self, **kwargs):
        """Turn on a led."""
        if ATTR_BRIGHTNESS in kwargs:
            self._brightness = kwargs[ATTR_BRIGHTNESS]

        if ATTR_TRANSITION in kwargs:
            transition_time = kwargs[ATTR_TRANSITION]
            self._led.transition(
                transition_time,
                is_on=True,
                brightness=_from_hass_brightness(self._brightness),
            )
        else:
            self._led.set(
                is_on=True, brightness=_from_hass_brightness(self._brightness)
            )

        self._is_on = True
        self.schedule_update_ha_state()

    def turn_off(self, **kwargs):
        """Turn off a LED."""
        if self.is_on:
            if ATTR_TRANSITION in kwargs:
                transition_time = kwargs[ATTR_TRANSITION]
                self._led.transition(transition_time, is_on=False)
            else:
                self._led.off()

        self._is_on = False
        self.schedule_update_ha_state()


class PwmRgbLed(PwmSimpleLed):
    """Representation of a RGB(W) PWM LED."""

    def __init__(self, led, name):
        """Initialize a RGB(W) PWM LED."""
        super().__init__(led, name)
        self._color = DEFAULT_COLOR

    async def async_added_to_hass(self):
        """Handle entity about to be added to hass event."""
        await super().async_added_to_hass()
        last_state = await self.async_get_last_state()
        if last_state:
            self._color = last_state.attributes.get("hs_color", DEFAULT_COLOR)
            self._led.set(color=_from_hass_color(self._color))

    @property
    def hs_color(self):
        """Return the color property."""
        return self._color

    @property
    def supported_features(self):
        """Flag supported features."""
        return SUPPORT_RGB_LED

    def turn_on(self, **kwargs):
        """Turn on a LED."""
        if ATTR_HS_COLOR in kwargs:
            self._color = kwargs[ATTR_HS_COLOR]
        if ATTR_BRIGHTNESS in kwargs:
            self._brightness = kwargs[ATTR_BRIGHTNESS]

        if ATTR_TRANSITION in kwargs:
            transition_time = kwargs[ATTR_TRANSITION]
            self._led.transition(
                transition_time,
                is_on=True,
                brightness=_from_hass_brightness(self._brightness),
                color=_from_hass_color(self._color),
            )
        else:
            self._led.set(
                is_on=True,
                brightness=_from_hass_brightness(self._brightness),
                color=_from_hass_color(self._color),
            )

        self._is_on = True
        self.schedule_update_ha_state()


def _from_hass_brightness(brightness):
    """Convert Home Assistant brightness units to percentage."""
    return brightness / 255


def _from_hass_color(color):
    """Convert Home Assistant RGB list to Color tuple."""

    rgb = color_util.color_hs_to_RGB(*color)
    return Color(*tuple(rgb))
