import esphome.codegen as cg
import esphome.config_validation as cv
from esphome.components import i2c, sensor
from esphome.const import CONF_BUS_VOLTAGE, CONF_CURRENT, CONF_ID, \
    CONF_MAX_CURRENT, CONF_MAX_VOLTAGE, CONF_POWER, CONF_SHUNT_RESISTANCE, \
    CONF_SHUNT_VOLTAGE, ICON_FLASH, UNIT_VOLT, UNIT_AMPERE, UNIT_WATT

DEPENDENCIES = ['i2c']

ina219_ns = cg.esphome_ns.namespace('ina219')
INA219Component = ina219_ns.class_('INA219Component', cg.PollingComponent, i2c.I2CDevice)

CONFIG_SCHEMA = cv.Schema({
    cv.GenerateID(): cv.declare_id(INA219Component),
    cv.Optional(CONF_BUS_VOLTAGE): sensor.sensor_schema(UNIT_VOLT, ICON_FLASH, 2),
    cv.Optional(CONF_SHUNT_VOLTAGE): sensor.sensor_schema(UNIT_VOLT, ICON_FLASH, 2),
    cv.Optional(CONF_CURRENT): sensor.sensor_schema(UNIT_AMPERE, ICON_FLASH, 3),
    cv.Optional(CONF_POWER): sensor.sensor_schema(UNIT_WATT, ICON_FLASH, 2),
    cv.Optional(CONF_SHUNT_RESISTANCE, default=0.1): cv.All(cv.resistance,
                                                            cv.Range(min=0.0, max=32.0)),
    cv.Optional(CONF_MAX_VOLTAGE, default=32.0): cv.All(cv.voltage, cv.Range(min=0.0, max=32.0)),
    cv.Optional(CONF_MAX_CURRENT, default=3.2): cv.All(cv.current, cv.Range(min=0.0)),
}).extend(cv.polling_component_schema('60s')).extend(i2c.i2c_device_schema(0x40))


def to_code(config):
    var = cg.new_Pvariable(config[CONF_ID])
    yield cg.register_component(var, config)
    yield i2c.register_i2c_device(var, config)

    cg.add(var.set_shunt_resistance_ohm(config[CONF_SHUNT_RESISTANCE]))
    cg.add(var.set_max_current_a(config[CONF_MAX_CURRENT]))
    cg.add(var.set_max_voltage_v(config[CONF_MAX_VOLTAGE]))

    if CONF_BUS_VOLTAGE in config:
        sens = yield sensor.new_sensor(config[CONF_BUS_VOLTAGE])
        cg.add(var.set_bus_voltage_sensor(sens))

    if CONF_SHUNT_VOLTAGE in config:
        sens = yield sensor.new_sensor(config[CONF_SHUNT_VOLTAGE])
        cg.add(var.set_shunt_voltage_sensor(sens))

    if CONF_CURRENT in config:
        sens = yield sensor.new_sensor(config[CONF_CURRENT])
        cg.add(var.set_current_sensor(sens))

    if CONF_POWER in config:
        sens = yield sensor.new_sensor(config[CONF_POWER])
        cg.add(var.set_power_sensor(sens))