# Copyright (c) 2010 Google Inc. All rights reserved.
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from webkitpy.common.config import irc as config_irc

from webkitpy.common.thread.messagepump import MessagePump, MessagePumpDelegate
from webkitpy.thirdparty.irc import ircbot
from webkitpy.thirdparty.irc import irclib


class IRCBotDelegate(object):
    def irc_message_received(self, nick, message):
        raise NotImplementedError('subclasses must implement')

    def irc_nickname(self):
        raise NotImplementedError('subclasses must implement')

    def irc_password(self):
        raise NotImplementedError('subclasses must implement')


class IRCBot(ircbot.SingleServerIRCBot, MessagePumpDelegate):
    # FIXME: We should get this information from a config file.
    def __init__(self,
                 message_queue,
                 delegate):
        self._message_queue = message_queue
        self._delegate = delegate
        ircbot.SingleServerIRCBot.__init__(
            self,
            [(
                config_irc.server,
                config_irc.port,
                self._delegate.irc_password()
            )],
            self._delegate.irc_nickname(),
            self._delegate.irc_nickname())
        self._channel = config_irc.channel

    # ircbot.SingleServerIRCBot methods

    def on_nicknameinuse(self, connection, event):
        connection.nick(connection.get_nickname() + "_")

    def on_welcome(self, connection, event):
        connection.join(self._channel)
        self._message_pump = MessagePump(self, self._message_queue)

    def on_pubmsg(self, connection, event):
        nick = irclib.nm_to_n(event.source())
        request = event.arguments()[0]

        if not irclib.irc_lower(request).startswith(irclib.irc_lower(connection.get_nickname())):
            return

        if len(request) <= len(connection.get_nickname()):
            return

        # Some IRC clients, like xchat-gnome, default to using a comma
        # when addressing someone.
        vocative_separator = request[len(connection.get_nickname())]
        if vocative_separator in [':', ',', ' ']:
            request = request.split(vocative_separator, 1)
        else:
            return

        if len(request) > 1:
            response = self._delegate.irc_message_received(nick, request[1])
            if response:
                connection.privmsg(self._channel, response)

    # MessagePumpDelegate methods

    def schedule(self, interval, callback):
        self.connection.execute_delayed(interval, callback)

    def message_available(self, message):
        self.connection.privmsg(self._channel, message)

    def final_message_delivered(self):
        self.die()