import random, string, logging

class MaPairingHandler:
    def __init__(self, mqtt, db):
        self._mqtt = mqtt
        self._db = db

    def handlePairingRequest(self, topic, message):
        if "actor" in topic:
            self._handleActorPairRequest(message)
        else:
            logging.warn(f"Invalid pairing request: {topic}, {message}, Device type not know.")

    def _handleActorPairRequest(self, id):
        logging.info(f"Pair request for type actor with ID {id}")
        if not self._db.userExists(f"actor-{id}"):
            logging.info(f"Pair request {id} accepted")
            password = ''.join(random.choices(string.ascii_uppercase + string.ascii_lowercase + string.digits, k=20))
            self._db.addUser(f"actor-{id}", password, [f"mlmAccess/actor/{id}/status"], [f"mlmAccess/actor/{id}/action"])
            self._mqtt.publish("mlmAccess/pair/response/actor", password)
        else:
            logging.warning(f"Rejecting pair request for ID {id}: ID already exists")
            self._mqtt.publish("mlmAccess/pair/response/actor", "")

    def _mqttOnConnect(self, client, userdata, flags, rc):
        client.subscribe("mlmAccess/pair/request/actor")