import argparse

from twisted.words.protocols import irc
from twisted.internet import protocol, reactor


class IDRTBot(irc.IRCClient):
    @property
    def nickname(self):
        return self.factory.nickname

    def signedOn(self):
        for c in self.factory.channels:
            self.join(c)
        print('signed on as {}.'.format(self.nickname))

    def joined(self, channel):
        print('joined {}'.format(channel))

    def privmsg(self, user, channel, msg):
        print('user: {} | channel: {} | msg: {}'.format(user, channel, msg))
        username = user.split('!', 1)[0]
        if channel == self.nickname:
            print('got private message')
            self.msg(username, "whisper back ...")
        if self.nickname in msg:
            self.msg(channel, 'echo: {}'.format(msg))


class IDRTBotFactory(protocol.ClientFactory):
    protocol = IDRTBot

    def __init__(self, channels, nickname='idrt'):
        self.channels = channels
        self.nickname = nickname

    def clientConnectionLost(self, connector, reason):
        print('lost connection({}), reconnecting.'.format(reason))

    def clientConnectionFailed(self, connector, reason):
        print('could not connect: {}'.format(reason))


parser = argparse.ArgumentParser()
parser.add_argument('-H', '--host', type=str, default='localhost')
parser.add_argument('-p', '--port', type=int, default=6667)
parser.add_argument('channels', nargs='+')

args = parser.parse_args()

reactor.connectTCP(
    args.host, int(args.port),
    IDRTBotFactory('#{}'.format(c) for c in args.channels)
)
reactor.run()