import config
import json
import logging
import mqtt
import os
import report
import task
import time

try:
    from config import APP_NAME as ROOT_LOGGER_NAME
except ImportError:
    ROOT_LOGGER_NAME = 'root'
logger = logging.getLogger(ROOT_LOGGER_NAME).getChild('main')


class exec_command(mqtt.mqtt_client, task.threaded_queue):
    def __init__(self):
        self.__block_execution__ = False
        task.threaded_queue.__init__(self)
        mqtt.mqtt_client.__init__(self, config.APP_NAME, config.MQTT_SERVER, 1883, config.MQTT_USER, config.MQTT_PASS)
        self.add_callback(config.TOPIC, self.mqtt_rx)

    def exec_command(self, rt):
        os.system(config.COMMAND)
        self.__block_execution__ = False
    

    def mqtt_rx(self, client, userdate, message):
        if not self.__block_execution__:
            data = None
            if config.PAYLOAD_KEY is None:
                try:
                    data = message.payload.decode('utf-8')
                except:
                    logger.exception("Error decoding mqtt message")
            else:
                try:
                    payload = json.loads(message.payload)
                except:
                    logger.exception("Error decoding json mqtt message")
                else:
                    data = payload.get(config.PAYLOAD_KEY)
            if config.PAYLOAD_DATA is None or data == config.PAYLOAD_DATA:
                logger.debug("Starting execution in background...")
                self.__block_execution__ = True
                self.enqueue(5, self.exec_command)
        else:
            logger.debug("Execution in progress. Ignoring request...")


if __name__ == '__main__': 
    report.appLoggingConfigure(config.__BASEPATH__, config.LOGTARGET, ((config.APP_NAME, config.LOGLVL), ), fmt=config.formatter, host=config.LOGHOST, port=config.LOGPORT)
    #
    ec = exec_command()
    ec.run()
    #
    while True:
        time.sleep(30)
    try:
        ec.join()
    finally:
        ec.stop()