import esphome.codegen as cg
import esphome.config_validation as cv
from esphome.components import uart
from esphome.const import CONF_ID, CONF_ADDRESS
from esphome.core import coroutine

DEPENDENCIES = ['uart']

modbus_ns = cg.esphome_ns.namespace('modbus')
Modbus = modbus_ns.class_('Modbus', cg.Component, uart.UARTDevice)
ModbusDevice = modbus_ns.class_('ModbusDevice')
MULTI_CONF = True

CONF_MODBUS_ID = 'modbus_id'
CONFIG_SCHEMA = cv.Schema({
    cv.GenerateID(): cv.declare_id(Modbus),
}).extend(cv.COMPONENT_SCHEMA).extend(uart.UART_DEVICE_SCHEMA)


def to_code(config):
    cg.add_global(modbus_ns.using)
    var = cg.new_Pvariable(config[CONF_ID])
    yield cg.register_component(var, config)

    yield uart.register_uart_device(var, config)


def modbus_device_schema(default_address):
    schema = {
        cv.GenerateID(CONF_MODBUS_ID): cv.use_id(Modbus),
    }
    if default_address is None:
        schema[cv.Required(CONF_ADDRESS)] = cv.hex_uint8_t
    else:
        schema[cv.Optional(CONF_ADDRESS, default=default_address)] = cv.hex_uint8_t
    return cv.Schema(schema)


@coroutine
def register_modbus_device(var, config):
    parent = yield cg.get_variable(config[CONF_MODBUS_ID])
    cg.add(var.set_parent(parent))
    cg.add(var.set_address(config[CONF_ADDRESS]))
    cg.add(parent.register_device(var))