import esphome.codegen as cg
import esphome.config_validation as cv
from esphome.components import display
from esphome.const import CONF_DIMENSIONS, CONF_LAMBDA
from esphome.core import coroutine

lcd_base_ns = cg.esphome_ns.namespace('lcd_base')
LCDDisplay = lcd_base_ns.class_('LCDDisplay', cg.PollingComponent)
LCDDisplayRef = LCDDisplay.operator('ref')


def validate_lcd_dimensions(value):
    value = cv.dimensions(value)
    if value[0] > 0x40:
        raise cv.Invalid("LCD displays can't have more than 64 columns")
    if value[1] > 4:
        raise cv.Invalid("LCD displays can't have more than 4 rows")
    return value


LCD_SCHEMA = display.BASIC_DISPLAY_SCHEMA.extend({
    cv.Required(CONF_DIMENSIONS): validate_lcd_dimensions,
}).extend(cv.polling_component_schema('1s'))


@coroutine
def setup_lcd_display(var, config):
    yield cg.register_component(var, config)
    yield display.register_display(var, config)
    cg.add(var.set_dimensions(config[CONF_DIMENSIONS][0], config[CONF_DIMENSIONS][1]))

    if CONF_LAMBDA in config:
        lambda_ = yield cg.process_lambda(config[CONF_LAMBDA], [(LCDDisplayRef, 'it')],
                                          return_type=cg.void)
        cg.add(var.set_writer(lambda_))