#!/usr/bin/env python3
import argparse
import re

import yaml
from irc.client import Event, NickMask, ServerConnection  # type: ignore
from pinhook import bot, plugin  # type: ignore

RELAY_REGEX = re.compile(r'^<([^@]+@(?:tilde|bread))>\s?(.*)$')


class BreadBot(bot.Bot):

    def on_welcome(self, c: ServerConnection, e: Event) -> None:
        c.mode(self.bot_nick, '+B')
        super().on_welcome(c, e)
        for channel in self.chanlist:
            self.process_output(c, channel, plugin.message('bread'))

    def process_event(self, c: ServerConnection, e: Event) -> None:
        # Handle BreadRelay by suppressing it
        if e.source.nick == 'BreadRelay' and e.arguments:
            match = RELAY_REGEX.match(e.arguments[0])
            if match:
                nick, e.arguments[0] = match.groups()
                # e.source.nick is a property, and e.source is a string
                # in the nick!userhost format, so we reconstruct it
                e.source = NickMask(f'{nick}!{e.source.userhost}')

        # Ignore messages sent by the bot itself
        if e.source.nick == self.bot_nick:
            return

        return super().process_event(c, e)


def main() -> None:
    parser = argparse.ArgumentParser(
        description='Breadpunk Bread Bot',
    )
    parser.add_argument(
        'config',
        type=argparse.FileType('r'),
        help='Configuration file',
    )
    args = parser.parse_args()
    config = yaml.safe_load(args.config)
    bot = BreadBot(**config)
    bot.start()


if __name__ == '__main__':
    main()