from esphome import pins
import esphome.codegen as cg
from esphome.components import uart
import esphome.config_validation as cv
from esphome.const import CONF_ID, CONF_RECEIVE_TIMEOUT, CONF_UART_ID

CODEOWNERS = ["@glmnet", "@zuidwijk"]

MULTI_CONF = True

DEPENDENCIES = ["uart"]
AUTO_LOAD = ["sensor", "text_sensor"]

CONF_CRC_CHECK = "crc_check"
CONF_DECRYPTION_KEY = "decryption_key"
CONF_DSMR_ID = "dsmr_id"
CONF_GAS_MBUS_ID = "gas_mbus_id"
CONF_WATER_MBUS_ID = "water_mbus_id"
CONF_MAX_TELEGRAM_LENGTH = "max_telegram_length"
CONF_REQUEST_INTERVAL = "request_interval"
CONF_REQUEST_PIN = "request_pin"

# Hack to prevent compile error due to ambiguity with lib namespace
dsmr_ns = cg.esphome_ns.namespace("esphome::dsmr")
Dsmr = dsmr_ns.class_("Dsmr", cg.Component, uart.UARTDevice)


def _validate_key(value):
    value = cv.string_strict(value)
    parts = [value[i : i + 2] for i in range(0, len(value), 2)]
    if len(parts) != 16:
        raise cv.Invalid("Decryption key must consist of 16 hexadecimal numbers")
    parts_int = []
    if any(len(part) != 2 for part in parts):
        raise cv.Invalid("Decryption key must be format XX")
    for part in parts:
        try:
            parts_int.append(int(part, 16))
        except ValueError:
            # pylint: disable=raise-missing-from
            raise cv.Invalid("Decryption key must be hex values from 00 to FF")

    return "".join(f"{part:02X}" for part in parts_int)


CONFIG_SCHEMA = cv.All(
    cv.Schema(
        {
            cv.GenerateID(): cv.declare_id(Dsmr),
            cv.Optional(CONF_DECRYPTION_KEY): _validate_key,
            cv.Optional(CONF_CRC_CHECK, default=True): cv.boolean,
            cv.Optional(CONF_GAS_MBUS_ID, default=1): cv.int_,
            cv.Optional(CONF_WATER_MBUS_ID, default=2): cv.int_,
            cv.Optional(CONF_MAX_TELEGRAM_LENGTH, default=1500): cv.int_,
            cv.Optional(CONF_REQUEST_PIN): pins.gpio_output_pin_schema,
            cv.Optional(
                CONF_REQUEST_INTERVAL, default="0ms"
            ): cv.positive_time_period_milliseconds,
            cv.Optional(
                CONF_RECEIVE_TIMEOUT, default="200ms"
            ): cv.positive_time_period_milliseconds,
        }
    ).extend(uart.UART_DEVICE_SCHEMA),
    cv.only_with_arduino,
)


async def to_code(config):
    uart_component = await cg.get_variable(config[CONF_UART_ID])
    var = cg.new_Pvariable(config[CONF_ID], uart_component, config[CONF_CRC_CHECK])
    cg.add(var.set_max_telegram_length(config[CONF_MAX_TELEGRAM_LENGTH]))
    if CONF_DECRYPTION_KEY in config:
        cg.add(var.set_decryption_key(config[CONF_DECRYPTION_KEY]))
    await cg.register_component(var, config)

    if CONF_REQUEST_PIN in config:
        request_pin = await cg.gpio_pin_expression(config[CONF_REQUEST_PIN])
        cg.add(var.set_request_pin(request_pin))
    cg.add(var.set_request_interval(config[CONF_REQUEST_INTERVAL].total_milliseconds))
    cg.add(var.set_receive_timeout(config[CONF_RECEIVE_TIMEOUT].total_milliseconds))

    cg.add_build_flag("-DDSMR_GAS_MBUS_ID=" + str(config[CONF_GAS_MBUS_ID]))
    cg.add_build_flag("-DDSMR_WATER_MBUS_ID=" + str(config[CONF_WATER_MBUS_ID]))

    # DSMR Parser
    cg.add_library("glmnet/Dsmr", "0.8")

    # Crypto
    cg.add_library("rweather/Crypto", "0.4.0")