import esphome.codegen as cg
import esphome.config_validation as cv
from esphome import pins
from esphome.components import light
from esphome.const import (
    CONF_CLOCK_PIN,
    CONF_DATA_PIN,
    CONF_METHOD,
    CONF_NUM_LEDS,
    CONF_PIN,
    CONF_TYPE,
    CONF_VARIANT,
    CONF_OUTPUT_ID,
    CONF_INVERT,
)
from esphome.core import CORE

neopixelbus_ns = cg.esphome_ns.namespace("neopixelbus")
NeoPixelBusLightOutputBase = neopixelbus_ns.class_(
    "NeoPixelBusLightOutputBase", light.AddressableLight
)
NeoPixelRGBLightOutput = neopixelbus_ns.class_(
    "NeoPixelRGBLightOutput", NeoPixelBusLightOutputBase
)
NeoPixelRGBWLightOutput = neopixelbus_ns.class_(
    "NeoPixelRGBWLightOutput", NeoPixelBusLightOutputBase
)
ESPNeoPixelOrder = neopixelbus_ns.namespace("ESPNeoPixelOrder")
NeoRgbFeature = cg.global_ns.NeoRgbFeature
NeoRgbwFeature = cg.global_ns.NeoRgbwFeature


def validate_type(value):
    value = cv.string(value).upper()
    if "R" not in value:
        raise cv.Invalid("Must have R in type")
    if "G" not in value:
        raise cv.Invalid("Must have G in type")
    if "B" not in value:
        raise cv.Invalid("Must have B in type")
    rest = set(value) - set("RGBW")
    if rest:
        raise cv.Invalid("Type has invalid color: {}".format(", ".join(rest)))
    if len(set(value)) != len(value):
        raise cv.Invalid("Type has duplicate color!")
    return value


def validate_variant(value):
    value = cv.string(value).upper()
    if value == "WS2813":
        value = "WS2812X"
    if value == "WS2812":
        value = "800KBPS"
    if value == "LC8812":
        value = "SK6812"
    return cv.one_of(*VARIANTS)(value)


def validate_method(value):
    if value is None:
        if CORE.is_esp32:
            return "ESP32_I2S_1"
        if CORE.is_esp8266:
            return "ESP8266_DMA"
        raise NotImplementedError

    if CORE.is_esp32:
        return cv.one_of(*ESP32_METHODS, upper=True, space="_")(value)
    if CORE.is_esp8266:
        return cv.one_of(*ESP8266_METHODS, upper=True, space="_")(value)
    raise NotImplementedError


def validate_method_pin(value):
    method = value[CONF_METHOD]
    method_pins = {
        "ESP8266_DMA": [3],
        "ESP8266_UART0": [1],
        "ESP8266_ASYNC_UART0": [1],
        "ESP8266_UART1": [2],
        "ESP8266_ASYNC_UART1": [2],
        "ESP32_I2S_0": list(range(0, 32)),
        "ESP32_I2S_1": list(range(0, 32)),
    }
    if CORE.is_esp8266:
        method_pins["BIT_BANG"] = list(range(0, 16))
    elif CORE.is_esp32:
        method_pins["BIT_BANG"] = list(range(0, 32))
    pins_ = method_pins.get(method)
    if pins_ is None:
        # all pins allowed for this method
        return value

    for opt in (CONF_PIN, CONF_CLOCK_PIN, CONF_DATA_PIN):
        if opt in value and value[opt] not in pins_:
            raise cv.Invalid(
                "Method {} only supports pin(s) {}".format(
                    method, ", ".join(f"GPIO{x}" for x in pins_)
                ),
                path=[CONF_METHOD],
            )
    return value


VARIANTS = {
    "WS2812X": "Ws2812x",
    "SK6812": "Sk6812",
    "800KBPS": "800Kbps",
    "400KBPS": "400Kbps",
}

ESP8266_METHODS = {
    "ESP8266_DMA": "NeoEsp8266Dma{}Method",
    "ESP8266_UART0": "NeoEsp8266Uart0{}Method",
    "ESP8266_UART1": "NeoEsp8266Uart1{}Method",
    "ESP8266_ASYNC_UART0": "NeoEsp8266AsyncUart0{}Method",
    "ESP8266_ASYNC_UART1": "NeoEsp8266AsyncUart1{}Method",
    "BIT_BANG": "NeoEsp8266BitBang{}Method",
}
ESP32_METHODS = {
    "ESP32_I2S_0": "NeoEsp32I2s0{}Method",
    "ESP32_I2S_1": "NeoEsp32I2s1{}Method",
    "ESP32_RMT_0": "NeoEsp32Rmt0{}Method",
    "ESP32_RMT_1": "NeoEsp32Rmt1{}Method",
    "ESP32_RMT_2": "NeoEsp32Rmt2{}Method",
    "ESP32_RMT_3": "NeoEsp32Rmt3{}Method",
    "ESP32_RMT_4": "NeoEsp32Rmt4{}Method",
    "ESP32_RMT_5": "NeoEsp32Rmt5{}Method",
    "ESP32_RMT_6": "NeoEsp32Rmt6{}Method",
    "ESP32_RMT_7": "NeoEsp32Rmt7{}Method",
    "BIT_BANG": "NeoEsp32BitBang{}Method",
}


def format_method(config):
    variant = VARIANTS[config[CONF_VARIANT]]
    method = config[CONF_METHOD]

    if config[CONF_INVERT]:
        if method == "ESP8266_DMA":
            variant = "Inverted" + variant
        else:
            variant += "Inverted"

    if CORE.is_esp8266:
        return ESP8266_METHODS[method].format(variant)
    if CORE.is_esp32:
        return ESP32_METHODS[method].format(variant)
    raise NotImplementedError


def _validate(config):
    if CONF_PIN in config:
        if CONF_CLOCK_PIN in config or CONF_DATA_PIN in config:
            raise cv.Invalid("Cannot specify both 'pin' and 'clock_pin'+'data_pin'")
        return config
    if CONF_CLOCK_PIN in config:
        if CONF_DATA_PIN not in config:
            raise cv.Invalid("If you give clock_pin, you must also specify data_pin")
        return config
    raise cv.Invalid("Must specify at least one of 'pin' or 'clock_pin'+'data_pin'")


CONFIG_SCHEMA = cv.All(
    light.ADDRESSABLE_LIGHT_SCHEMA.extend(
        {
            cv.GenerateID(CONF_OUTPUT_ID): cv.declare_id(NeoPixelBusLightOutputBase),
            cv.Optional(CONF_TYPE, default="GRB"): validate_type,
            cv.Optional(CONF_VARIANT, default="800KBPS"): validate_variant,
            cv.Optional(CONF_METHOD, default=None): validate_method,
            cv.Optional(CONF_INVERT, default="no"): cv.boolean,
            cv.Optional(CONF_PIN): pins.output_pin,
            cv.Optional(CONF_CLOCK_PIN): pins.output_pin,
            cv.Optional(CONF_DATA_PIN): pins.output_pin,
            cv.Required(CONF_NUM_LEDS): cv.positive_not_null_int,
        }
    ).extend(cv.COMPONENT_SCHEMA),
    _validate,
    validate_method_pin,
)


async def to_code(config):
    has_white = "W" in config[CONF_TYPE]
    template = cg.TemplateArguments(getattr(cg.global_ns, format_method(config)))
    if has_white:
        out_type = NeoPixelRGBWLightOutput.template(template)
    else:
        out_type = NeoPixelRGBLightOutput.template(template)
    rhs = out_type.new()
    var = cg.Pvariable(config[CONF_OUTPUT_ID], rhs, out_type)
    await light.register_light(var, config)
    await cg.register_component(var, config)

    if CONF_PIN in config:
        cg.add(var.add_leds(config[CONF_NUM_LEDS], config[CONF_PIN]))
    else:
        cg.add(
            var.add_leds(
                config[CONF_NUM_LEDS], config[CONF_CLOCK_PIN], config[CONF_DATA_PIN]
            )
        )

    cg.add(var.set_pixel_order(getattr(ESPNeoPixelOrder, config[CONF_TYPE])))

    # https://github.com/Makuna/NeoPixelBus/blob/master/library.json
    cg.add_library("NeoPixelBus-esphome", "2.6.2")