import esphome.codegen as cg
import esphome.config_validation as cv
from esphome import pins
from esphome.components import sensor, voltage_sampler
from esphome.const import (
    CONF_ATTENUATION,
    CONF_ID,
    CONF_PIN,
    DEVICE_CLASS_VOLTAGE,
    STATE_CLASS_MEASUREMENT,
    UNIT_VOLT,
)


AUTO_LOAD = ["voltage_sampler"]

ATTENUATION_MODES = {
    "0db": cg.global_ns.ADC_ATTEN_DB_0,
    "2.5db": cg.global_ns.ADC_ATTEN_DB_2_5,
    "6db": cg.global_ns.ADC_ATTEN_DB_6,
    "11db": cg.global_ns.ADC_ATTEN_DB_11,
}


def validate_adc_pin(value):
    vcc = str(value).upper()
    if vcc == "VCC":
        return cv.only_on_esp8266(vcc)
    return pins.analog_pin(value)


adc_ns = cg.esphome_ns.namespace("adc")
ADCSensor = adc_ns.class_(
    "ADCSensor", sensor.Sensor, cg.PollingComponent, voltage_sampler.VoltageSampler
)

CONFIG_SCHEMA = (
    sensor.sensor_schema(
        unit_of_measurement=UNIT_VOLT,
        accuracy_decimals=2,
        device_class=DEVICE_CLASS_VOLTAGE,
        state_class=STATE_CLASS_MEASUREMENT,
    )
    .extend(
        {
            cv.GenerateID(): cv.declare_id(ADCSensor),
            cv.Required(CONF_PIN): validate_adc_pin,
            cv.SplitDefault(CONF_ATTENUATION, esp32="0db"): cv.All(
                cv.only_on_esp32, cv.enum(ATTENUATION_MODES, lower=True)
            ),
        }
    )
    .extend(cv.polling_component_schema("60s"))
)


async def to_code(config):
    var = cg.new_Pvariable(config[CONF_ID])
    await cg.register_component(var, config)
    await sensor.register_sensor(var, config)

    if config[CONF_PIN] == "VCC":
        cg.add_define("USE_ADC_SENSOR_VCC")
    else:
        cg.add(var.set_pin(config[CONF_PIN]))

    if CONF_ATTENUATION in config:
        cg.add(var.set_attenuation(config[CONF_ATTENUATION]))