import esphome.codegen as cg
import esphome.config_validation as cv
from esphome import automation
from esphome.components import sensor
from esphome.const import CONF_ID, CONF_SENSOR, CONF_RESTORE

integration_ns = cg.esphome_ns.namespace('integration')
IntegrationSensor = integration_ns.class_('IntegrationSensor', sensor.Sensor, cg.Component)
ResetAction = integration_ns.class_('ResetAction', automation.Action)

IntegrationSensorTime = integration_ns.enum('IntegrationSensorTime')
INTEGRATION_TIMES = {
    'ms': IntegrationSensorTime.INTEGRATION_SENSOR_TIME_MILLISECOND,
    's': IntegrationSensorTime.INTEGRATION_SENSOR_TIME_SECOND,
    'min': IntegrationSensorTime.INTEGRATION_SENSOR_TIME_MINUTE,
    'h': IntegrationSensorTime.INTEGRATION_SENSOR_TIME_HOUR,
    'd': IntegrationSensorTime.INTEGRATION_SENSOR_TIME_DAY,
}
IntegrationMethod = integration_ns.enum('IntegrationMethod')
INTEGRATION_METHODS = {
    'trapezoid': IntegrationMethod.INTEGRATION_METHOD_TRAPEZOID,
    'left': IntegrationMethod.INTEGRATION_METHOD_LEFT,
    'right': IntegrationMethod.INTEGRATION_METHOD_RIGHT,
}

CONF_TIME_UNIT = 'time_unit'
CONF_INTEGRATION_METHOD = 'integration_method'

CONFIG_SCHEMA = sensor.SENSOR_SCHEMA.extend({
    cv.GenerateID(): cv.declare_id(IntegrationSensor),
    cv.Required(CONF_SENSOR): cv.use_id(sensor.Sensor),
    cv.Required(CONF_TIME_UNIT): cv.enum(INTEGRATION_TIMES, lower=True),
    cv.Optional(CONF_INTEGRATION_METHOD, default='trapezoid'):
        cv.enum(INTEGRATION_METHODS, lower=True),
    cv.Optional(CONF_RESTORE, default=False): cv.boolean,
}).extend(cv.COMPONENT_SCHEMA)


def to_code(config):
    var = cg.new_Pvariable(config[CONF_ID])

    yield cg.register_component(var, config)
    yield sensor.register_sensor(var, config)

    sens = yield cg.get_variable(config[CONF_SENSOR])
    cg.add(var.set_sensor(sens))
    cg.add(var.set_time(config[CONF_TIME_UNIT]))
    cg.add(var.set_method(config[CONF_INTEGRATION_METHOD]))
    cg.add(var.set_restore(config[CONF_RESTORE]))


@automation.register_action('sensor.integration.reset', ResetAction, automation.maybe_simple_id({
    cv.Required(CONF_ID): cv.use_id(IntegrationSensor),
}))
def sensor_integration_reset_to_code(config, action_id, template_arg, args):
    paren = yield cg.get_variable(config[CONF_ID])
    yield cg.new_Pvariable(action_id, template_arg, paren)