import logging, socket
from threading import Thread
from functools import wraps

class V5(object):
    def __init__(self, v5, irc):
        """ Initialize v5 handle
        :irc <IRC>: an initialized IRC object """
        self.irc = irc
        self._sock = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
        self._sock.bind(v5)
        self._handler = Thread(target=self._handle)
        self._callbacks = []

    def start(self):
        # Start v5 handler
        self._handler.start()
        logging.info("started")

    def on(self, event):
        """ Adds a callback to the v5 handler
            Event is a function taking in parameter a list of channels and a
            string, and return True if the callback should be executed """

        def callback(func):
            @wraps(func)
            def wrapper(channels, message):
                func(channels, message)
            self._callbacks.append((event, wrapper))
            return wrapper

        return callback


    def _handle(self):
        while True:
            data, addr = self._sock.recvfrom(4096)
            data = data.decode()
            logging.debug(f"received {data}")
            channels, message = data.split(":", 1)
            channels = channels.split(" ")

            for event, callback in self._callbacks:
                if event(channels, message):
                    logging.info(f"passed {event.__name__}")
                    callback(channels, message)