import voluptuous as vol

import esphomeyaml.config_validation as cv
from esphomeyaml.const import CONF_BAUD_RATE, CONF_ID, CONF_LEVEL, CONF_LOGGER, CONF_LOGS, \
    CONF_LOG_TOPIC, CONF_TX_BUFFER_SIZE
from esphomeyaml.core import ESPHomeYAMLError
from esphomeyaml.helpers import App, Pvariable, RawExpression, add, exp_empty_optional

LOG_LEVELS = ['NONE', 'ERROR', 'WARN', 'INFO', 'DEBUG', 'VERBOSE']

is_log_level = vol.All(vol.Upper, vol.Any(*LOG_LEVELS))

CONFIG_SCHEMA = cv.ID_SCHEMA.extend({
    cv.GenerateID(CONF_LOGGER): cv.register_variable_id,
    vol.Optional(CONF_BAUD_RATE): cv.positive_int,
    vol.Optional(CONF_LOG_TOPIC): vol.Any(None, '', cv.publish_topic),
    vol.Optional(CONF_TX_BUFFER_SIZE): cv.positive_int,
    vol.Optional(CONF_LEVEL): is_log_level,
    vol.Optional(CONF_LOGS): vol.Schema({
        cv.string: is_log_level,
    })
})


def esphomelib_log_level(level):
    return u'ESPHOMELIB_LOG_LEVEL_{}'.format(level)


def exp_log_level(level):
    return RawExpression(esphomelib_log_level(level))


def to_code(config):
    baud_rate = config.get(CONF_BAUD_RATE)
    if baud_rate is None and CONF_LOG_TOPIC in config:
        baud_rate = 115200
    log_topic = None
    if CONF_LOG_TOPIC in config:
        if not config[CONF_LOG_TOPIC]:
            log_topic = exp_empty_optional(u'std::string')
        else:
            log_topic = config[CONF_LOG_TOPIC]
    rhs = App.init_log(baud_rate, log_topic)
    log = Pvariable(u'LogComponent', config[CONF_ID], rhs)
    if CONF_TX_BUFFER_SIZE in config:
        add(log.set_tx_buffer_size(config[CONF_TX_BUFFER_SIZE]))
    if CONF_LEVEL in config:
        add(log.set_global_log_level(exp_log_level(config[CONF_LEVEL])))
    for tag, level in config.get(CONF_LOGS, {}).iteritems():
        global_level = config.get(CONF_LEVEL, 'DEBUG')
        if LOG_LEVELS.index(level) > LOG_LEVELS.index(global_level):
            raise ESPHomeYAMLError(u"The local log level {} for {} must be less severe than the "
                                   u"global log level {}.".format(level, tag, global_level))
        add(log.set_log_level(tag, exp_log_level(level)))


def get_build_flags(config):
    if CONF_LEVEL in config:
        return u'-DESPHOMELIB_LOG_LEVEL={}'.format(esphomelib_log_level(config[CONF_LEVEL]))
    return u''