import config
import mqtt
import report
import subprocess
import time


logger = report.default_logging_config()

mc = mqtt.mqtt_client(config.APP_NAME, config.MQTT_SERVER, 1883, config.MQTT_USER, config.MQTT_PASS)

class mpc(object):
    PLAYING_TXT = 'playing'

    def __init__(self, state_callback, title_callback):
        logger.info("Starting MPD monitor...")
        self.__state_callback__ = state_callback
        self.__title_callback__ = title_callback
        self.__state__ = None
        self.__title__ = None
        self.set_state(False)
        self.set_title("")

    def run(self):
        while True:
            output = subprocess.check_output(["mpc", "status"])
            out_txt = output.decode('UTF-8')
            self.set_state(self.PLAYING_TXT in out_txt)
            if self.__state__:
                self.set_title(out_txt.split("\n")[0])
            else:
                self.set_title("")
            time.sleep(.2)

    def set_state(self, target_state):
        if self.__state__ != target_state:
            self.__state__ = target_state
            logger.info('MPD state changed to %s', self.__state__)
            self.__state_callback__(self.__state__)

    def set_title(self, title):
        if self.__title__ != title:
            logger.info('MPD is playing "%s"', title)
            self.__title_callback__(title)
        self.__title__ = title


def send_state_msg_mqtt(state):
    topic = config.MQTT_TOPIC + "/state"
    logger.info("Sending MPD status information to mqtt %s = %s", topic, str(state))
    mc.send(topic, "true" if state else "false")


def send_title_msg_mqtt(title):
    topic = config.MQTT_TOPIC + "/title"
    logger.info("Sending MPD title information to mqtt %s = \"%s\"", topic, title)
    mc.send(topic, title)


if __name__ == '__main__': 
    mpd = mpc(send_state_msg_mqtt, send_title_msg_mqtt)
    mpd.run()