import json
import logging


mainLogger = logging.getLogger("hugvey")

# hyper verbose log level. Have it here, becase it needs to be _somewhere_
LOG_BS = 5

def getTopic(hugvey_id):
    if hugvey_id > 99:
        raise Exception("Incompatible with hugvey id > 99")
    
    # We will have to zero-fill the number (01 instead of 1), because of how zmq
    # topic subscription works: subscribing to hv1 also brings in messages for
    # hv10 hv11 and hv1whatever, hence only hv01, hv02 etc is unique
    return "hv{:02}".format(hugvey_id)


def zmqSend(socket, hugvey_id, msg):
    log = mainLogger.getChild("{}".format(hugvey_id)).getChild("communication")
    log.debug("SEND: {}".format(msg))
    msgData = json.dumps(msg)
    topic = getTopic(hugvey_id)
    log.debug("Send 0mq to {} containing {}".format(topic, msg))
    socket.send_multipart([topic.encode(), msgData.encode()])

async def zmqReceive(socket):
    topic, msg = await socket.recv_multipart()
    hugvey_id = int(topic.decode()[2:])
    mainLogger.getChild("{}".format(hugvey_id)).getChild("communication").debug(
        "Received 0mq messages for Hugvey #{} containing {}".format(hugvey_id, msg.decode())
    )
    return hugvey_id, json.loads(msg.decode())